Trolley

Abstract

Disclosed is a trolley, comprising a height-adjustable trolley frame, the trolley frame comprising an upper frame, a lower frame, a support mechanism, a lifting / lowering adjustment member and a lifting / lowering adjustment unlocking member. The support mechanism comprises a first support and a second support pivotally connected to each other, and the pivoting of the first support and the second support relative to each other enables the upper frame to be lifted or lowered. The lifting / lowering adjustment member is slidably arranged on the upper frame and is switchable between a locked state and an unlocked state. The lifting / lowering adjustment unlocking member is configured to be operable to switch the lifting / lowering adjustment member from the locked state to the unlocked state. One of the first support and the second support is pivotably connected to the lifting / lowering adjustment member, and the other of the first support and the second support is pivotably connected to the upper frame. When the lifting / lowering adjustment member is in the locked state, the sliding of the lifting / lowering adjustment member relative to the upper frame is prevented, and when the lifting / lowering adjustment member is in the unlocked state, the sliding of the lifting / lowering adjustment member relative to the upper frame is allowed.

Description

[0001] Technical Field

[0002] This disclosure relates to handcarts, and in particular, to handcarts capable of carrying portable vehicles.

[0003] Background Technology

[0004] Currently, when traveling with infants or pets, people often use portable vehicles such as infant carriers and sleeping boxes to carry them. As infants or pets grow and gain weight, caregivers often find it difficult to carry or move these portable vehicles due to their increased weight, which is especially noticeable when the caregiver is elderly.

[0005] Handcarts for transporting portable vehicles already exist. By loading the portable vehicle onto such a handcart, caregivers can easily carry the portable vehicle while walking and move it to the desired destination by pushing the handcart.

[0006] Traditional handcarts designed to carry portable vehicles still suffer from problems such as inconvenience in operation, difficulty in folding, insufficient functionality, and difficulty in cleaning. (Invention Content)

[0007] The purpose of this disclosure is to provide an improved handcart capable of carrying portable vehicles.

[0008] One aspect of this disclosure provides a handcart having a height-adjustable frame, the frame including: an upper frame; a lower frame; a support mechanism disposed between the upper and lower frames and including a first and second support pivotally connected to each other, the pivoting of the first and second supports relative to each other enabling the upper frame to rise or fall; a height adjustment member slidably disposed on the upper frame and switchable between a locked and unlocked state; and a height adjustment release member configured to operable to switch the height adjustment member from the locked state to the unlocked state. One of the first and second supports is pivotally connected to the height adjustment member, and the other of the first and second supports is pivotally connected to the upper frame. When the height adjustment member is in the locked state, sliding of the height adjustment member relative to the upper frame is prevented, while when the height adjustment member is in the unlocked state, sliding of the height adjustment member relative to the upper frame is permitted.

[0009] In some embodiments of this disclosure, the support mechanism further includes a drive rod slidably and rollably connected to the upper frame relative to the upper frame, a lifting adjustment member connected to the drive rod, and a front end of the upper frame fixedly connected to the drive rod. The lifting adjustment member is configured such that when in the locked state, it prevents the drive rod from sliding relative to the upper frame, and when in the unlocked state, it allows the drive rod to slide relative to the upper frame.

[0010] In some embodiments of this disclosure, the upper frame includes a longitudinal rod extending in a front-rear direction; the lifting adjustment member includes a sliding sleeve slidable along a portion of the longitudinal rod; and the drive rod is connected to the sliding sleeve.

[0011] In some embodiments of this disclosure, the front end of the first bracket is slidably and rotatably connected to the front portion of the upper frame relative to the upper frame, and the rear end of the first bracket is pivotally connected to the rear portion of the lower frame. The front end of the second bracket is slidably and rotatably connected to the front portion of the lower frame relative to the lower frame, and the rear end of the second bracket is pivotally connected to the rear portion of the upper frame.

[0012] In some embodiments of this disclosure, the upper frame includes a limiting rod extending along the longitudinal direction of the upper frame, the limiting rod being rotatable about its axis. The lifting adjustment member is sleeved on the limiting rod. When the lifting adjustment member is in the locked state, the lifting adjustment member and the limiting rod are in threaded engagement, and by rotating the limiting rod, the lifting adjustment member can move axially along the limiting rod.

[0013] In some embodiments of this disclosure, the limiting rod includes a screw. The lifting adjustment member includes a sliding sleeve and a sliding locking member movably disposed in the sliding sleeve. The sliding sleeve is fitted onto the limiting rod, and the sliding locking member is adapted to selectively engage or disengage with the screw.

[0014] In some embodiments of this disclosure, the support mechanism includes a first X-shaped support mechanism composed of the first support and the second support. The support mechanism also includes at least one second X-shaped support mechanism located below the first X-shaped support mechanism, and the first X-shaped support mechanism and the at least one second X-shaped support mechanism are stacked.

[0015] In some embodiments of this disclosure, the frame further includes a support platform disposed on the upper frame and adapted to carry a portable vehicle. The upper frame includes a locking device configured to secure the portable vehicle supported on the support platform. Another aspect of this disclosure provides a handcart comprising: a frame; a support platform disposed on top of the frame and adapted to carry a portable vehicle; and a locking device including: a locking member movable between a locked position and an unlocked position, wherein when the locking member is in the locked position, the locking member is adapted to secure the portable vehicle supported on the support platform; and an unlocking retainer movable between an extended position and a retracted position. When the release retainer is pressed down to the retracted position, the engaging locking member is allowed to move from the locked position to the release position and then restricted from moving from the release position to the locked position; when the force is released and the release retainer moves from the retracted position to the extended position, the engaging locking member is allowed to move from the release position to the locked position.

[0016] In some embodiments of this disclosure, the trolley further includes: an engagement / unlocking member configured to operate to move the engagement / locking member from the locked position to the unlocked position; and a drive block configured to move toward the engagement / locking member when the engagement / unlocking member is operated, thereby driving the engagement / locking member from the locked position to the unlocked position. When the unlocking retainer is in the retracted position, the drive block is adapted to hold the engagement / locking member in the unlocked position.

[0017] In some embodiments of this disclosure, the engaging device further includes a stop slidably disposed within the release retainer. When the release retainer is in the retracted position, the stop is adapted to engage with the drive block. When the drive block engages with the stop, the drive block prevents the engaging locking member from moving from the release position to the locked position.

[0018] In some embodiments of this disclosure, the trolley further includes an engagement / release mechanism configured operable to pivot the engagement locking member from the locked position to the released position. The engagement device also includes a retaining drive and a stop slidable relative to the retaining drive, the retaining drive being movable between a first position and a second position, the retaining drive being closer to the engagement locking member in the first position than in the second position. The retaining drive is in the first position when the release retaining member is pressed down into the retracted position. The engagement locking member is provided with a stop engagement. When the retaining drive is in the first position and the engagement locking member pivots to the released position, the stop is adapted to engage with the stop engagement.

[0019] Another aspect of this disclosure provides a handcart comprising: a frame including an upper frame located at the top of the frame, the upper frame being adapted to carry a portable vehicle; and a slide connected to the upper frame and switchable between a folded state and an unfolded state, wherein when the slide is in the unfolded state, at least a portion of the slide is located in front of the upper frame, and the at least a portion of the slide is adapted to carry the portable vehicle.

[0020] In some embodiments of this disclosure, the slide is pivotally connected to the front end of the upper frame and is pivotable relative to the upper frame. When the slide is in the retracted state, it is located below the upper frame, and when the slide is in the extended state, it is substantially flush with the upper frame.

[0021] In some embodiments of this disclosure, the slide is slidably disposed in the front portion of the upper frame. When the slide is in the retracted state, it is retracted within the upper frame, and when the slide is in the extended state, at least a portion of the slide extends from the front end of the upper frame.

[0022] In some embodiments of this disclosure, the slide is detachably connected to the upper frame.

[0023] Another aspect of this disclosure provides a handcart comprising: a lower frame; a handlebar pivotally connected to the lower frame and including a lower support rod and an upper support rod pivotally connected to the lower support rod; a carrying platform disposed on top of the lower frame and adapted to carry a portable vehicle; a locking device disposed on the lower frame, the locking device being configured to secure the portable vehicle carried on the carrying platform; and a locking-releasing member configured to operable to release the locking device from securing the portable vehicle. The locking-releasing member is disposed at the pivot joint between the upper support rod and the lower support rod.

[0024] In some embodiments of this disclosure, the engaging device includes: an engaging locking member movable between a locked position and an unlocked position, wherein when the engaging locking member is in the locked position, the engaging locking member is adapted to secure the portable vehicle supported on the support platform; and an unlocking retainer movable between an extended position and a retracted position. When the unlocking retainer is pressed down into the retracted position, it allows the engaging locking member to move from the locked position to the unlocked position and then restricts the engaging locking member from moving from the unlocked position to the locked position; when the force is released and the unlocking retainer moves from the retracted position to the extended position, it allows the engaging locking member to move from the unlocked position to the locked position.

[0025] In some embodiments of this disclosure, the locking and releasing mechanism includes a locking and releasing mechanism housing. An anti-pinch member is provided on the locking and releasing mechanism, and the anti-pinch member is pivotally connected to the locking and releasing mechanism housing.

[0026] Another aspect of this disclosure provides a handcart comprising: a frame; a support platform disposed at the top or bottom of the frame and adapted to carry a portable vehicle; and a locking device comprising: a locking member movable between a locked position and an unlocked position, wherein when the locking member is in the locked position, the locking member is adapted to secure the portable vehicle carried on the support platform; and an elastic member adapted to act on the locking member to cause the locking member to translate or pivot from the unlocked position to the locked position.

[0027] In some embodiments of this disclosure, the frame further includes: a lower frame, the engaging device disposed on the lower frame; a rider pivotally connected to the lower frame; and an engaging release member configured to operate to translate or pivot the engaging locking member from the locked position to the release position, thereby releasing the engaging locking member from the portable vehicle.

[0028] In some embodiments of this disclosure, the locking and unlocking mechanism is disposed on the lower frame.

[0029] In some embodiments of this disclosure, the rider includes a lower support rod and an upper support rod pivotally connected to the lower support rod, and the locking / unlocking device is disposed at the pivot point between the upper support rod and the lower support rod.

[0030] In some embodiments of this disclosure, the frame includes a support member connecting the rider and the lower frame, and the locking / unlocking member is disposed on the support member.

[0031] Attached Figure Description

[0032] The features and advantages of this disclosure will be better understood through the following detailed description of exemplary embodiments utilizing the principles of this disclosure, with reference to the accompanying drawings:

[0033] Figure 1 is a schematic diagram of a handcart according to an embodiment of the present disclosure;

[0034] Figure 2 is a schematic diagram of a handcart loaded with a portable vehicle according to an embodiment of the present disclosure;

[0035] Figure 3A is a side view of a handcart according to an embodiment of the present disclosure, wherein the frame is in a first height in an unfolded state; Figure 3B is a side view of a handcart according to an embodiment of the present disclosure, wherein the frame is in a second height in an unfolded state; Figure 3C is a side view of a handcart according to an embodiment of the present disclosure, wherein the frame is in a folded state.

[0036] Figure 4 is a side view of a partial structure of a handcart according to an embodiment of the present disclosure;

[0037] Figure 5 is an exploded view of the components of the handcart shown in Figure 4;

[0038] Figures 6 and 7 are schematic diagrams of the handcart shown in Figure 4 from different perspectives, and show enlarged views of some parts of the structure; Figure 8 is a schematic diagram of the bottom of the upper frame shown in Figure 5;

[0039] Figure 9 is an enlarged schematic diagram of the limiting component shown in Figure 8;

[0040] Figures 10 and 11 are top and bottom views, respectively, of the upper frame with a lifting adjustment member mounted on the limiting member; Figure 12 is a partial sectional view of the upper frame shown in Figure 10.

[0041] Figures 13A and 13B are schematic diagrams of the sliding locking component in the engaged and disengaged positions, respectively.

[0042] Figure 14 is a bottom view of some components of the upper frame shown in Figure 10, and also shows an enlarged view of the local structure;

[0043] Figure 15A is a schematic diagram of a portion of the upper frame shown in Figure 14 from another perspective, wherein the sliding lock is in the disengaged position; Figure 15B is a schematic diagram of a portion of the upper frame shown in Figure 14 from another perspective, wherein the sliding lock is in the engaged position; Figure 16 shows a handcart according to an embodiment of the present disclosure, and a portable carrier suitable for loading the handcart.

[0044] Figure 17 is a schematic diagram of an upper frame loaded with a portable vehicle according to an embodiment of the present disclosure;

[0045] Figure 18A is a partial sectional view of the upper frame along line AA in Figure 17;

[0046] Figure 18B is a partial sectional view of the upper frame along line BB in Figure 17;

[0047] Figure 18C is a schematic diagram of the engaging device in Figure 18A when the engaging locking member moves to the unlocking position;

[0048] Figure 18D is a schematic diagram of the engaging device in Figure 18C after the portable vehicle has been removed;

[0049] Figure 19 is a bottom view of some components of the upper frame shown in Figure 17;

[0050] Figure 20 is a schematic diagram of the locking and unlocking mechanism in Figure 19;

[0051] Figure 21A is a schematic diagram of part of the engaging device, in which the stop is engaged with the drive block;

[0052] Figure 21B is a schematic diagram of part of the engaging device, in which the stop is disengaged from the drive block;

[0053] Figure 22 is a side view of a handcart according to an embodiment of the present disclosure, wherein the rider is in the unfolded position;

[0054] Figure 23 is a side view of a handcart according to an embodiment of the present disclosure, wherein the rider is in an extended position and a folded position; Figure 24 is a side view of a handcart according to an embodiment of the present disclosure, wherein the rider is in a folded position;

[0055] Figure 25 is a side view of a handcart according to an embodiment of the present disclosure, wherein the rider is in a folded position and the frame is in a folded state; Figure 26A is a schematic diagram of a handcart according to an embodiment of the present disclosure;

[0056] Figure 26B is a cross-sectional view of a local structure of region R in Figure 26A;

[0057] Figures 27 and 28 are schematic diagrams of the handcart shown in Figure 22 from different perspectives, and also show enlarged views of the partial structure; Figures 29 and 30 are bottom views of the handcart shown in Figures 22 and 24, respectively.

[0058] Figure 31 is a schematic diagram of a partial structure of a handcart according to an embodiment of the present disclosure;

[0059] Figure 32 is an exploded view of partial components of a trolley with an operator retraction operation member installed;

[0060] Figure 33 is a cross-sectional view showing the position change of the operator retraction operation member before and after being operated;

[0061] Figure 34 is a schematic diagram of the structure shown in Figure 31 after removing the outer cover;

[0062] Figure 35 is a bottom view of the structure shown in Figure 34;

[0063] Figures 36 and 37 are schematic diagrams of the structure shown in Figure 34 after removing the bottom plate from different perspectives;

[0064] Figure 38 is a cross-sectional view of the trolley deployment locking device along the C-C line in Figure 36;

[0065] Figures 39A and 39B are cross-sectional views showing the trolley deployment locking device in the locked state and the released state respectively;

[0066] Figure 40 is a side view of a trolley with a drag plate according to an embodiment of the present disclosure, wherein the drag plate is in the retracted state;

[0067] Figure 41 is a side view of a trolley with a drag plate according to an embodiment of the present disclosure, wherein the drag plate is in the deployed state;

[0068] Figure 42 is a schematic diagram of a usage state of the trolley shown in Figure 41;

[0069] Figure 43 is a side view of a trolley with a drag plate according to another embodiment of the present disclosure, wherein the drag plate is in the retracted state; Figure 44 is a side view of a trolley with a drag plate according to another embodiment of the present disclosure, wherein the drag plate is in the deployed state; Figure 45 shows the frame of a trolley according to an embodiment of the present disclosure;

[0070] Figure 46 is a schematic diagram of a trolley with a side enclosure according to an embodiment of the present disclosure;

[0071] Figure 47 is a bottom view of the trolley shown in Figure 46;

[0072] Figures 48A and 48B are schematic diagrams of an upper cover according to an embodiment of the present disclosure from different perspectives;

[0073] Figure 49 is a schematic diagram of a trolley with a side enclosure according to another embodiment of the present disclosure.

[0074] Figure 50 is a schematic diagram of a trolley according to an embodiment of the present disclosure;

[0075] Figure 51 is an exploded view of the components of the trolley shown in Figure 50;

[0076] Figure 52A is a side view of the trolley shown in Figure 50, where the frame is at the first height in the unfolded state;

[0077] Figure 52B is a side view of the trolley shown in Figure 50, where the frame is at the second height in the unfolded state;

[0078] Figure 52C is a side view of the trolley shown in Figure 50, where the frame is in the folded state;

[0079] Figure 53A is a schematic view of a part of the structure of the trolley shown in Figure 50;

[0080] Figure 53B is a schematic view of a part of the structure of the trolley shown in Figure 53A from another perspective, where the outer shell of the lower frame is removed; Figure 54 is a schematic view of a part of the structure of the trolley shown in Figure 53 from another perspective, and shows an enlarged view of the local structure; Figures 55A and 55B are respectively top views of a part of the structure of the trolley shown in Figure 50 with an upper frame, where the lifting adjustment member is in the first position in Figure 55A and the lifting adjustment member is in the second position in Figure 55B;

[0081] Figure 56 is a schematic view of the trolley shown in Figure 54 from another perspective, where the lifting adjustment member is in the first position;

[0082] Figure 57A is a schematic view of the structure shown in Figure 55A from another perspective, and shows an enlarged view of the local structure;

[0083] Figure 57B is a partial cross-sectional view of the lifting adjustment unlocking member along the D-D line in Figure 57A;

[0084] Figure 58 is a schematic view of the structure shown in Figure 55A from another perspective, and shows an enlarged view of the local structure;

[0085] Figures 59A and 59B are respectively cross-sectional views of a part of the structure with a lifting adjustment member along the E-E line in Figure 58, where the lifting adjustment member is in the locked state in Figure 59A and the lifting adjustment member is in the unlocked state in Figure 59B;

[0086] Figure 60 is a schematic view of a trolley according to another embodiment of the present disclosure;

[0087] Figure 61 is a schematic view of a trolley loaded with a portable vehicle according to an embodiment of the present disclosure;

[0088] FIG. 62 shows a trolley according to an embodiment of the present disclosure, and a portable vehicle adapted to be loaded on the trolley, and shows an enlarged view of a partial structure;

[0089] FIG. 63 is a schematic view of the trolley in FIG. 62 from another perspective, and shows an enlarged view of a partial structure;

[0090] FIGS. 64A and 64B respectively show the top and bottom of the upper frame of the trolley in FIG. 62; FIG. 65 shows the engaging and releasing lock and the engaging device of the trolley in FIG. 62 connected by a traction member, wherein the housing of the engaging device is removed;

[0091] FIG. 66A is a cross-sectional view of the engaging and releasing lock along the line F-F in FIG. 65, wherein the engaging and releasing lock is not pressed;

[0092] FIG. 66B is a schematic cross-sectional view when the engaging and releasing lock shown in FIG. 66A is pressed;

[0093] FIG. 67 is a partial top view of the upper frame of the trolley in FIG. 62 equipped with an engaging device, wherein the upper cover of the housing of the engaging device is removed;

[0094] FIG. 68 is a partial bottom view of the upper frame of the trolley in FIG. 62 equipped with an engaging device, wherein the upper cover and the lower cover of the housing of the engaging device are removed;

[0095] FIG. 69 is a schematic view of a partial structure of the engaging device;

[0096] FIG. 70 is an exploded view of the components in the area S in FIG. 65;

[0097] FIG. 71A is a schematic view when the engaging lock in FIG. 68 is in the locked position;

[0098] FIG. 71B is a schematic view when the engaging lock in FIG. 68 is in the unlocked position;

[0099] FIG. 72A is a cross-sectional view of a partial structure of the engaging device along the line G-G in FIG. 69, wherein the unlocking retaining member is pressed; FIG. 72B is a cross-sectional view of the partial structure of the engaging device shown in FIG. 72A when the unlocking retaining member is not pressed;

[0100] FIGS. 73A and 73B are respectively schematic views of a partial structure of the engaging device, wherein in FIG. 73A the engaging lock is in the locked position, and in FIG. 73B the engaging lock is in the unlocked position;

[0101] FIG. 74 is a schematic view of a trolley according to an embodiment of the present disclosure;

[0102] FIG. 75 is a schematic view of the trolley shown in FIG. 74 when loaded with a portable vehicle;

[0103] FIG. 76 is a bottom view of the trolley shown in FIG. 75;

[0104] FIG. 77 is a schematic view of the trolley in FIG. 74 after removing the carrying platform, and shows an enlarged view of a partial structure;

[0105] FIG. 78 is a schematic view of the trolley shown in FIG. 77 from another perspective, and shows an enlarged view of a partial structure;

[0106] FIG. 79 is a schematic view of the trolley shown in FIG. 77 from another perspective, in which part of the outer shell of the engaging and unlocking member is removed, and shows an enlarged view of a partial structure;

[0107] FIG. 80 is a schematic view of the trolley shown in FIG. 77 during the folding process;

[0108] FIG. 81 is a schematic view of a trolley according to another embodiment of the present disclosure, and shows an enlarged view of a partial structure;

[0109] FIG. 82 is a schematic view of the trolley shown in FIG. 81 from another perspective, and shows an enlarged view of a partial structure, in which the upper cover of the engaging device housing is removed;

[0110] FIG. 83 is a schematic view of a trolley according to an embodiment of the present disclosure;

[0111] FIG. 84 is a top view of the trolley shown in FIG. 83, and shows an enlarged view of a partial structure;

[0112] FIG. 85 is a partial cross-sectional view taken along the line H-H in FIG. 83;

[0113] FIG. 86 is a partial cross-sectional view taken along the line I-I in FIG. 84;

[0114] FIG. 87 is a schematic view showing a partial structure of the lower frame of the trolley in FIG. 83 equipped with an engaging device;

[0115] FIG. 88 is a schematic view of the partial structure in FIG. 87 after removing the upper cover;

[0116] FIG. 89 is a schematic view of the engaging device in FIG. 87 after removing the upper cover;

[0117] FIG. 90 is a cross-sectional view taken along the line J-J in FIG. 87;

[0118] Figure 91 is a cross-sectional view taken along line K-K in Figure 87;

[0119] Figure 92 is a schematic view of a latching device according to another embodiment of the present disclosure;

[0120] Figure 93 is a schematic view of a latching lock according to another embodiment of the present disclosure;

[0121] Figure 94 is a cross-sectional view taken along line L-L in Figure 92;

[0122] Figure 95 is a cross-sectional view taken along line M-M in Figure 92;

[0123] Figure 96 is a schematic view showing a partial structure of a cart body of the trolley in Figure 83 with a storage rack installed;

[0124] Figure 97 is a schematic view of the partial structure of the cart body in Figure 96 after removing the storage rack;

[0125] Figure 98 is a schematic view of the partial structure of the storage rack in Figure 96;

[0126] Figure 99 is a schematic view of a trolley according to another embodiment of the present disclosure; Figure 100 is an enlarged view of area T in Figure 99;

[0127] Figure 101 is a cross-sectional view taken along line P-P in Figure 100;

[0128] Figure 102 is a cross-sectional view taken along line Q-Q in Figure 100;

[0129] Figure 103 is a schematic view of a trolley according to another embodiment of the present disclosure, and shows an enlarged view of a partial structure;

[0130] Figure 104 is a top view of the trolley shown in Figure 103, and shows an enlarged view of a partial structure;

[0131] Figure 105 is a partial cross-sectional view taken along line R-R in Figure 103;

[0132] Figure 106 is a partial cross-sectional view taken along line S-S in Figure 104.

[0133] Description of reference numerals:

[0134] 100, trolley;

[0135] 1000, frame;

[0136] 1100, Upper frame; 1110, Outer frame of the upper frame; 1111, Upper sliding groove; 1120, Longitudinal rod; 1131, First transverse rod; 1132, Second transverse rod; 1140, Limiting member; 1141, Limiting groove

[0137] 1200, Lower frame; 1210, Outer frame of the lower frame; 1211, Lower sliding groove; 1221, First rotating shaft; 1222, Second rotating shaft; 1230, Fixed rod of the locking device; 1240, Fixed seat of the traction member

[0138] 1300, Bracket mechanism; 1310, First bracket; 1311, First support rod; 1312, Second support rod; 1320, Second bracket; 1321, Third support rod; 1322, Fourth support rod; 1331, First fixed rod; 1332, Second fixed rod; 1333, Third fixed rod; 1334, Fourth fixed rod; 1335, Fifth fixed rod; 1340, Driving rod; 1350, Bearing

[0139] 1400, Lifting and adjusting member; 1410, Sliding sleeve; 1420, First traction member; 1430, Sliding locking member; 1431, Engaging teeth; 1440, First driving member; 1441, First driving inclined groove; 1450, First fixing pin; 1460, First elastic member; 1470, Outer shell of the lifting and adjusting member; 1500, Lifting and adjusting unlocking member, 1510, Second driving inclined groove; 1520, Connecting member of the first traction member; 1530, Second fixing pin; 1600, Carrying platform

[0140] 1700, Handle; 1710, Fifth elastic member

[0141] 1800, Pneumatic rod

[0142] 2000, Engaging device; 2010, Engaging locking member; 2011, Locking hook; 2020, Unlocking and retaining member; 2021, Driving groove; 2022, Fourth fixing pin; 2030, Driving block; 2031, Locking hole; 2040, Second elastic member; 2050, Stopping member; 2060, Third elastic member; 2070, Fourth elastic member; 2080, Outer shell of the engaging device

[0143] 2100, Engaging and unlocking member; 2110, Third driving inclined groove; 2120, Second traction member; 2130, Connecting member of the second traction member; 2140, Third fixing pin

[0144] 3000, Rider; 3010, Putter; 3011, Upper Putter; 3012, Lower Putter; 3013, Club Sleeve; 3020, Grip

[0145] 3100, Crossbar; 3110, Slide Block; 3120, Fixed Cover

[0146] 3200, Connecting Rod

[0147] 3300, Bottom Plate; 3310, Guide Groove; 3320, Outer Cover

[0148] 3400, Rider Deployment Locking Device; 3410, Inner Cover; 3411, Front Vertical Groove; 3412, Rear Vertical Groove; 3420, Engaging Member; 3430, Second Driving Member; 3431, Front Driving Inclined Groove; 3432, Rear Driving Inclined Groove; 3441, Front Fixed Pin; 3442, Rear Fixed Pin; 3451, Front Elastic Member; 3452, Rear Elastic Member

[0149] 3500, Rider Retraction Operating Member; 3510, Third Traction Member; 3511, Traction Member Fixed Pin

[0150] 4000>Trailer Board

[0151] 5100, Upper Cover; 5110, Foam Material Layer; 5120, Seat Cloth Layer; 5200, Lower Cover; 5300, Side Enclosure

[0152] 200, Portable Vehicle; 210, Club Holder

[0153] 300, Vehicle Seat; 310, Seat Surface

[0154] H1, First Height; H2, Second Height

[0155] P1, First Pivot Point; P2, Second Pivot Point; P3, Third Pivot Point; P4, Fourth Pivot Point; P5, Fifth Pivot Point; P6, Sixth Pivot Point; P7, Seventh Pivot Point; P8, Eighth Pivot Point

[0156] 600, Trolley; 6000, Frame

[0157] 6100, Upper Frame; 6110, Outer Frame of Upper Frame; 6120, Upper Longitudinal Rod; 6130, Crossbar; 6140, First Fixed Seat; 6150, Second Fixed Seat; 6160, Third Fixed Seat

[0158] 6200, lower frame; 6210, lower longitudinal rod; 6210a, first lower longitudinal rod; 6211a, first guiding groove; 6210b, second lower longitudinal rod; 6211b, second guiding groove; 6220, first rotating shaft; 6230, sleeve; 6230a, first sleeve; 6230b, second sleeve; 6240, second rotating shaft;

[0159] 6300, support mechanism; 6310, first X-shaped support mechanism; 6311, first upper support; 6311a, first upper support rod; 6311b, second upper support rod; 6312, second upper support; 6312a, third upper support rod; 6312b, fourth upper support rod; 6320, second X-shaped support mechanism; 6321, first lower support; 6321a, first lower support rod; 6321b, second lower support rod; 6322, second lower support; 6322a, third lower support rod; 6322b, fourth lower support rod;

[0160] 6400, lifting adjustment member; 6410, sliding sleeve; 6420, sliding locking member; 6430, first driving member; 6431, second driving inclined groove; 6440, second driving member; 6450, first fixing pin; 6460, first elastic member; 6470, third rotating shaft;

[0161] 6500, lifting adjustment unlocking member; 6510, first traction member; 6520, first mounting seat; 6521, first guiding groove; 6530, lifting adjustment unlocking button; 6531, first driving inclined groove;

[0162] 6600 > limiting rod; 6610 > screw rod; 6620 > screw rod sleeve; 6630, extension rod; 6640 > rod cap;

[0163] 6700, operating handle; 6710, operating handle connecting member;

[0164] 6800, carrying platform;

[0165] 6900, rider;

[0166] hl, first height; h2, second height;

[0167] pl, first pivot point; p2, second pivot point; p3, third pivot point; p4, fourth pivot point; p5, fifth pivot point; p6, sixth pivot point; p7, seventh pivot point; p8, eighth pivot point;

[0168] 7000, Clamping device; 7010, Clamping locking member; 7011, Locking hook; 7012, Pivoting hole; 7013, Fixing hole; 7014, Locking hole; 7020, Unlocking retaining member; 7021, Fourth driving chute; 7030, Sleeve; 7031, Third guiding chute; 7040, Tension spring; 7050, Mounting plate; 7051, Fourth rotating shaft; 7060, Stopper; 7061, Fourth fixing pin; 7062, Second elastic member; 7063, Third elastic member; 7070, Retaining driving member; 7071, Fifth fixing pin; 7072, Accommodating cavity; 7073, Long slot hole; 7080, Clamping device housing

[0169] 7100, Clamping unlocking member; 7110, Second traction member; 7120, Second mounting base; 7121, Second guiding chute; 7130, Clamping unlocking button; 7131, Third driving chute; 7140, Second fixing pin; 7150, Traction member connecting part

[0170] 700, Portable vehicle; 710, Clamping rod

[0171] 800, Wheelbarrow

[0172] 8100, Lower frame; 8110, Longitudinal rod; 8120, Outer rod

[0173] 8200, Wheelbarrow body; 8210, Upper support rod; 8220, Lower support rod

[0174] 8300, Support member; 8310, First rod; 8311, Intermediate pivot point; 8320, Second rod; 8330, Third rod; 8340, Intermediate connecting part

[0175] 8400, Clamping device

[0176] 8500, Clamping unlocking member; 8510, Traction member; 8520, Clamping unlocking member housing; 8521, Guiding chute; 8530, Clamping unlocking button; 8531, Driving chute; 8540, Fixing pin

[0177] 8600, Anti - pinch member; 8610, Fifth rotating shaft; 8620, Torsion spring

[0178] 8700, Carrying platform

[0179] 8800, Clamping unlocking member; 8810, Traction member; 8820, Clamping unlocking pull button; 8821, Operating part; 8822, Connecting part; 8830, Mounting block

[0180] 900, Wheelbarrow;

[0181] 9100, Lower frame; 9110, Fixed rod; 9111, First limiting groove; 9112, Second limiting groove; 9120, Outer rod; 9130, Inner frame;

[0182] 9200, Wheelbarrow handle; 9210, Push rod; 9220, Grip bar; 9230, Fixed seat; 9231, Engaging groove; 9300, Engaging device; 9310, Engaging device housing; 9311, Upper cover; 9312, Lower cover; 9320, Engaging locking part; 9321, Locking hook; 9322, Locking hole; 9323, Slot; 9330, Unlocking retaining part; 9340, Sleeve; 9350, Stop part; 9360, Retaining driving part; 9370, First driving block; 9371, Limiting hole; 9372, Clearance hole; 9380, Second driving block; 9381, Connecting rod; 9382, Insertion plate; 9390, First elastic part;

[0183] 9400, Engaging unlocking part; 9410, Traction part; 9420, Engaging unlocking push button; 9430, Linking part; 9431, Driving inclined groove; 9440, Mounting seat; 9441, Guide groove; 9450, Connecting part;

[0184] 9500, Storage rack; 9510, Accommodation cavity; 9511, Clamping part; 9520, Engaging seat; 9521, Elastic part;

[0185] 9600, Support part; 9610, First rod; 9620, Second rod; 9621, Sliding groove;

[0186] 9700, Engaging unlocking part; 9710, Traction part; 9720, Engaging unlocking pull handle; 9730, Fixed pin;

[0187] 9800, Engaging unlocking part; 9810, Traction part; 9811, Traction part sheath; 9820, Engaging unlocking pedal; 9821, Pedal part; 9822, Connecting part; 9830, Mounting seat; 9831, Pivot shaft;

[0188] D1, First direction; D2, Second direction.

[0189] Specific》^ formula

[0190] In the following description, various aspects of the present disclosure will be described. For purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be apparent to those skilled in the art that other embodiments of the present disclosure differ in details without departing from its essence. Therefore, the present disclosure is not limited to the content shown in the drawings and described in the specification, but only as indicated in the appended claims, and the proper scope of the present disclosure is determined only by the broadest interpretation of the claims.

[0191] When a feature or element is referred to herein as "on another feature or element", it can be directly on the other feature or element, or intervening features and / or elements may also be present. Conversely, when a feature or element is referred to as "directly" on another feature or element, no intervening features or elements are present. It should also be understood that when a feature or element is referred to as "connected", "attached" or "joined" to another feature or element, it can be directly connected, attached or joined to the other feature or element, or intervening features or elements may be present. Conversely, when a feature or element is referred to as "directly connected", "directly attached" or "directly joined" to another feature or element, no intervening features or elements are present.

[0192] Spatial relative terms, such as "beneath", "below", "above", "over", etc., are used herein for ease of description, particularly to describe the positional relationship of one feature or element to another as shown in the figures. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figures is inverted, a feature or element described herein as "beneath" other features or elements will be oriented "above" the other features or elements. Thus, the exemplary term "beneath" can include both an orientation above and below. The device may also be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptions used herein are to be interpreted accordingly. Similarly, unless otherwise specifically specified, terms such as "upward", "downward", "vertical", "horizontal", etc. used herein are for illustrative purposes only.

[0193] Although the terms "first" and "second" may be used herein to describe various features or elements, these features or elements shall not be limited by these terms unless otherwise specifically specified. These terms can be used to distinguish one feature or element from another. Thus, the first feature or element discussed below can be referred to as the second feature or element, and similarly, the second feature or element discussed below can be referred to as the first feature or element. As used herein, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0194] It should be noted that, unless otherwise clearly specified and limited, the orientation terms such as "front", "rear", "left", and "right" related to the trolley in this article are based on the orientation shown in the drawings. In the drawings, the arrows L and R schematically show the "left" and "right" directions, and the arrows F and B schematically show the "front" and "rear" directions. For example, "front" means the direction towards which the trolley faces when moving forward, "rear" means the direction away from which the trolley moves when moving forward, "left" means "left" when looking from the rear of the trolley towards the front, and "right" means "right" when looking from the rear of the trolley towards the front. Other orientation terms related to "front", "rear", "left", and "right" mentioned in the text have similar meanings. These orientation terms are only used to make the description of the embodiments of the present disclosure clearer and are not used to unduly limit the protection scope of the present disclosure.

[0195] One aspect of the present disclosure provides a trolley having a liftable frame.

[0196] FIG. 1 shows a trolley 100 according to an embodiment of the present disclosure. The trolley 100 includes a frame 1000 and a handle 3000 provided on the frame 1000. A user can push the trolley 100 by grasping the handle 3000. A plurality of rollable wheels, such as casters, are provided at the bottom of the frame 1000. In this embodiment, four wheels are provided, namely, a left front wheel, a right front wheel, a left rear wheel, and a right rear wheel. In other embodiments, any number of wheels can be provided as needed, and the wheels can be provided at any suitable position. A carrying platform 1600 is provided at the top of the frame 1000, and the carrying platform 1600 is used to carry a portable vehicle 200 (refer to FIG. 2). A clamping device 2000 is also provided at the top of the frame 1000. When the portable vehicle 200 is carried on the carrying platform 1600, the clamping device 2000 is used to fix the portable vehicle 200. The portable vehicle 200 includes a baby basket, a baby sleeping box, a pet basket, a pet sleeping box, etc., which are vehicles for carrying babies or pets. Depending on the vehicle loaded thereon, the trolley 100 can be used as a baby trolley for carrying babies or a pet trolley for carrying pets. It can be understood that the carrying platform 1600 can also be used to carry goods. In this case, the trolley 100 is used as a goods trolley for carrying goods.

[0197] The frame 1000 is liftable to switch between an extended state and a collapsed state, and when the frame 1000 is in the extended state, the frame 1000 can be adjusted to multiple heights. Referring to FIGS. 3A to 3C, in FIGS. 3A and 3B, the frame 1000 is in the extended state, and in FIG. 3C, the frame 1000 is in the collapsed state. When the frame 1000 is in the extended state, according to the usage needs, the frame 1000 can be adjusted to one of the multiple heights, so that, for example, the user can install the portable vehicle 200 onto the carrying platform 1600, or disassemble the portable vehicle 200 from the carrying platform 1600, or, when the carrying platform 1600 carries the portable vehicle 200, carry a baby or a pet into or out of the portable vehicle 200. For example, referring to FIG. 3A, the frame 1000 has a first height H1. In this article, the height of the frame 1000 means the distance between the top surface of the frame 1000 (i.e., the surface where the carrying platform 1600 is located) and the bottom surface of the frame 1000. When the user feels that the first height H1 is too high, the frame 1000 can be lowered. For example, the frame 1000 is lowered to have a second height H2 as shown in FIG. 3B. When the frame 1000 is adjusted from the first height H1 shown in FIG. 3A to the second height H2 shown in FIG. 3B, the height of the carrying platform 1600 will decrease, and vice versa. When the frame 1000 is adjusted from the second height H2 shown in FIG. 3B to the first height H1 shown in FIG. 3A, the height of the carrying platform 1600 will increase. It can be understood that when the frame 1000 is adjusted to the lowest height, the frame 1000 is in the collapsed state, as shown in FIG. 3C. Referring to FIG. 4, the frame 1000 includes an upper frame 1100, a lower frame 1200, and a bracket mechanism 1300 disposed between the upper frame 1100 and the lower frame 1200. The bracket mechanism 1300 is an X-shaped bracket mechanism, which includes a first bracket 1310 and a second bracket 1320 that are pivotally connected to each other. The pivoting of the first bracket 1310 and the second bracket 1320 relative to each other can raise or lower the upper frame 1100. For example, when the first bracket 1310 and the second bracket 1320 pivot relative to each other such that the front end of the first bracket 1310 is远离 from the front end of the second bracket 1320 relative to each other, the upper frame 1100 will be raised. When the first bracket 1310 and the second bracket 1320 pivot relative to each other such that the front end of the first bracket 1310 is靠近 to the front end of the second bracket 1320 relative to each other, the upper frame 1100 will be lowered.

[0198] The frame 1000 further includes a lifting adjustment member 1400 and a lifting adjustment unlocking member 1500 which will be described in detail below. The lifting adjustment member 1400 is switchable between a locked state and an unlocked state. When the lifting adjustment member 1400 is in the locked state, the lifting adjustment member 1400 prevents the first bracket 1310 and the second bracket 1320 from pivoting relative to each other, and when the lifting adjustment member 1400 is in the unlocked state, the lifting adjustment member 1400 allows the first bracket 1310 and the second bracket 1320 to pivot relative to each other. Since the lifting adjustment member has a locking function, the lifting adjustment member can also be referred to as a "lifting adjustment locking member". The lifting adjustment unlocking member 1500 is configured to be operable to switch the lifting adjustment member 1400 from the locked state to the unlocked state.

[0199] The front end of the first bracket 1310 is slidably and rotatably connected to the front part of the upper frame 1100 relative to the upper frame 1100, and the rear end of the first bracket 1310 is pivotally connected to the rear part of the lower frame 1200. The front end of the second bracket 1320 is slidably and rotatably connected to the front part of the lower frame 1200 relative to the lower frame 1200, and the rear end of the second bracket 1320 is pivotally connected to the rear part of the upper frame 1100. In the present embodiment, the bracket mechanism has a left-right symmetric structure, and the following will describe one side shown in FIG. 4 as an example, and the other side has the same structure and will not be described again.

[0200] In FIG. 4, the positions of the pivot points (i.e., the first pivot point P1, the second pivot point P2, the third pivot point P3, the fourth pivot point P4, and the fifth pivot point P5) around which the components in the bracket mechanism pivot during the lifting of the frame 1000 are schematically marked. The first bracket 1310 and the second bracket 1320 are pivotally connected at the first pivot point P1, the rear end of the first bracket 1310 is pivotally connected to the lower frame 1200 at the second pivot point P2, and the rear end of the second bracket 1320 is pivotally connected to the upper frame 1100 at the fourth pivot point P4. During the lifting of the frame 1000, the position of the second pivot point P2 in the lower frame 1200 does not change, and the position of the fourth pivot point P4 in the upper frame 1100 does not change. That is, during the lifting of the frame 1000, the rear end of the first bracket 1310 only pivots around the second pivot point P2 and does not displace relative to the lower frame 1200. And the rear end of the second bracket 1320 only pivots around the fourth pivot point P4 and does not displace relative to the upper frame 1100.

[0201] The third pivot point P3 about which the front end of the first bracket 1310 pivots is slidable along the upper frame 1100, and the fifth pivot point P5 about which the front end of the second bracket 1320 pivots is also slidable along the lower frame 1200. During the rising process of the vehicle frame 1000, the third pivot point P3 will slide from front to back along the upper frame 1100, and the fifth pivot point P5 will slide from front to back along the lower frame 1200; during the descending process of the vehicle frame 1000, the third pivot point P3 will slide from back to front along the upper frame 1100, and the fifth pivot point P5 will slide from back to front along the lower frame 1200. That is to say, during the lifting and lowering process of the vehicle frame 1000, in addition to pivoting about the third pivot point P3, the front end of the first bracket 1310 will also slide along the upper frame 1100, and in addition to pivoting about the fifth pivot point P5, the front end of the second bracket 1320 will also slide along the lower frame 1200. By the sliding of the front ends of the first bracket 1310 and the second bracket 1320 relative to the upper frame 1100 and the lower frame 1200 respectively, and the pivoting of the first bracket 1310 and the second bracket 1320 about the corresponding pivot points, the lifting and lowering of the bracket mechanism 1300 can be achieved, that is, the lifting and lowering of the upper frame 1100 and the carrying platform 1600 provided on the upper frame 1100. Therefore, the user can adjust the height of the carrying platform 1600 as needed.

[0202] In this embodiment, the vehicle frame 1000 further includes a handle 1700. The handle 1700 is provided on the upper frame 1100. The handle 1700 can be grasped by the user to apply an upward or downward force to the upper frame 1100, so as to facilitate raising or lowering the upper frame 1100. In addition, the vehicle frame 1000 further includes a pneumatic rod 1800. The pneumatic rod 1800 is used to assist in the deployment of the bracket mechanism 1300, making it easier for the user to raise the upper frame 1100. In this embodiment, one end of the pneumatic rod 1800 is pivotally connected to the front end of the lower frame 1200, and the other end is pivotally connected to the first bracket 1310. In some other embodiments, the pneumatic rod 1800 can be arranged such that one end is pivotally connected to the rear end of the lower frame 1200 and the other end is pivotally connected to the second bracket 1320. It is also possible to arrange this pneumatic rod 1800 between the upper frame 1100 and the first bracket 1310, or to arrange this pneumatic rod 1800 between the upper frame 1100 and the second bracket 1320. It can be understood that although only one pneumatic rod 1800 is provided in this embodiment, in other embodiments, multiple pneumatic rods 1800 can be provided as needed.

[0203] Referring to FIG. 5, the first bracket 1310 includes a first support rod 1311 and a second support rod 1312 that are parallel to each other, and the second bracket 1320 includes a third support rod 1321 and a fourth support rod 1322 that are parallel to each other. The first support rod 1311 and the third support rod 1321 are pivotally connected to each other at a substantially central position in their respective longitudinal directions, and the second support rod 1312 and the fourth support rod 1322 are pivotally connected to each other at a central position in their respective longitudinal directions. In this embodiment, the third support rod 1321 and the fourth support rod 1322 are respectively located outside the first support rod 1311 and the second support rod 1312. In other embodiments, the third support rod 1321 and the fourth support rod 1322 may also be respectively located inside the first support rod 1311 and the second support rod 1312. A plurality of fixing rods are connected between the first support rod 1311 and the second support rod 1312, and a plurality of fixing rods are also connected between the third support rod 1321 and the fourth support rod 1322. For example, in this embodiment, a first fixing rod 1331, a second fixing rod 1332, and a third fixing rod 1333 are connected between the first support rod 1311 and the second support rod 1312, and a fourth fixing rod 1334 and a fifth fixing rod 1335 are connected between the third support rod 1321 and the fourth support rod 1322. The second fixing rod 1332 and the third fixing rod 1333 are respectively close to the front end and the rear end of the first bracket 1310, and the fourth fixing rod 1334 and the fifth fixing rod 1335 are respectively close to the front end and the rear end of the second bracket 1320. The first fixing rod 1331 is located at the front part of the first bracket 1310 and is close to the central position of the first bracket 1310 in the longitudinal direction, that is, the position where the first bracket 1310 is pivotally connected to the second bracket 1320. The first fixing rod 1331 is connected to the other end of the pneumatic rod 1800.

[0204] The bracket mechanism 1300 further includes a drive rod 1340, and the drive rod 1340 is slidably and rollably connected to the upper frame 1100 relative to the upper frame 1100. The front end of the upper frame 1100 is fixedly connected to the drive rod 1340. Specifically, both ends of the drive rod 1340 pass through the front ends of the first support rod 1311 and the second support rod 1312 respectively, and are respectively connected to two bearings 1350. These two bearings 1350 are respectively slidably disposed on the left and right sides of the front part of the upper frame 1100. The sliding of the drive rod 1340 relative to the upper frame 1100 can drive the first bracket 1310 to pivot relative to the second bracket 1320. In this embodiment, the lifting adjustment member 1400 and the lifting adjustment unlocking member 1500, which will be described in detail below, are both disposed on the upper frame 1100. The lifting adjustment member 1400 is configured such that when the lifting adjustment member 1400 is in the locked state, it prevents the drive rod 1340 from sliding relative to the upper frame 1100, and when the lifting adjustment member 1400 is in the unlocked state, it allows the drive rod 1340 to slide relative to the upper frame 1100.

[0205] Referring again to Figure 5, the upper frame 1100 includes a longitudinal rod 1120 extending along its front-rear direction, and the lifting adjustment member 1400 includes a sliding sleeve 1410 slidable along a portion of the longitudinal rod 1120. The sliding sleeve 1410 is connected to a drive rod 1340. Specifically, the drive rod 1340 can pass through the sliding sleeve 1410 of the lifting adjustment member 1400. The upper frame 1100 also includes a generally rectangular upper frame outer frame 1110, in which the longitudinal rod 1120 is located. Specifically, the longitudinal rod 1120 extends along its length between the front and rear ends of the upper frame 1100 in a generally central position in the lateral direction (i.e., left-right direction) of the upper frame outer frame 1110. A plurality of transverse rods are provided between the longitudinal rod 1120 and the upper frame outer frame 1110, serving as reinforcements to improve the structural strength of the upper frame 1100. For example, in this embodiment, a first transverse bar 1131 and a second transverse bar 1132 are provided between the longitudinal bar 1120 and the outer frame 1110 of the upper frame. A locking device 2000 is provided on the longitudinal bar 1120 and located between the first transverse bar 1131 and the second transverse bar 1132. A lifting adjustment release member 1500 is provided on the outer wall of one side of the outer frame 1110 of the upper frame. In this embodiment, two lifting adjustment release members 1500 are provided, and these two lifting adjustment release members 1500 are respectively located on opposite sides (i.e., the left and right sides) of the outer wall of the outer frame 1110 of the upper frame. It is understood that in other embodiments, only one lifting adjustment release member 1500 may be provided.

[0206] Upper sliding grooves 1111 are respectively provided on the opposite inner sides of the outer frame 1110 of the upper frame. The two ends of the drive rod 1340 are adapted to slide in the upper sliding grooves. Specifically, the upper sliding grooves 1111 are located at the front of the outer frame 1110 of the upper frame. As mentioned above, the support mechanism is a left-right symmetrical structure. The following description will take one end of the drive rod 1340 as an example. The other end has the same structure and will not be described again. Referring to Figure 5 and Figure 6, one end of the drive rod 1340 passes through the front end of the second support rod 1312 and is connected to the bearing 1350. The upper sliding groove 1111 is provided at the front of the side wall of the outer frame 1110 of the upper frame facing the longitudinal rod 1120. The bearing 1350 is slidably and rollably disposed in the upper sliding groove 1111. The front end of the second support rod 1312 is fixedly connected to the drive rod 1340 by means such as welding or bonding. By sliding and rolling the bearing 1350 in the upper groove 1111, the front end of the second support rod 1312 can slide and pivot relative to the upper frame 1100. During the pivoting of the first bracket 1310 relative to the second bracket 1320, the third pivot point P3 around which the front end of the second support rod 1312 pivots will slide along the upper frame 1100.

[0207] Referring again to Figure 5 and in conjunction with Figure 7, the lower frame 1200 includes a generally rectangular lower frame outer frame 1210. Sliding grooves 121L are respectively provided on the opposite inner sides of the lower frame outer frame 1210. Specifically, the sliding grooves 121L are located at the front of the lower frame outer frame 1210. As mentioned earlier, the support mechanism has a left-right symmetrical structure. The following description will take the front end of the fourth support rod 1322 as an example; the front end of the third support rod 1321 has the same structure and will not be repeated. The front end of the fourth support rod 1322 is pivotally connected to the first rotating shaft 1221, which is slidably disposed in the sliding groove 1211. While the first rotating shaft 1221 slides along the sliding groove 1211, the fourth support rod 1322 can pivot around the first rotating shaft 1221. During the pivoting of the second support 1320 relative to the first support 1310, the fifth pivot point P5 around which the front end of the fourth support rod 1322 pivots will slide along the lower frame 1200.

[0208] The rear end of the first support rod 1311 is pivotally connected to the lower frame outer frame 1210 via the second pivot 1222. The second pivot 1222 is immovable relative to the lower frame outer frame 1210. Therefore, during the pivoting of the first support 1310 relative to the second support 1320, the second pivot point P2 around which the rear end of the first support rod 1311 pivots will not be displaced relative to the lower frame 1200. As mentioned above, the support mechanism is a bilaterally symmetrical structure. The rear end of the second support rod 1312 has the same structure as the rear end of the first support rod 1311, and will not be described again.

[0209] Referring again to Figure 5 and in conjunction with Figures 8 and 9, the upper frame 1100 further includes a limiting member 1140, which is disposed along the longitudinal rod 1120. Specifically, the limiting member 1140 is disposed on the bottom surface of the longitudinal rod 1120 and extends along the front part of the longitudinal rod 1120. The limiting member 1140 is provided with a plurality of limiting grooves 1141, which are arranged along the length direction of the limiting member 1140. The positions of these limiting grooves 1141 in the front-rear direction of the upper frame 1100 substantially correspond to the positions of the upper sliding groove 1111 in the front-rear direction of the upper frame 1100.

[0210] Referring again to Figure 5 and in conjunction with Figures 10 and 11, the sliding sleeve 1410 is slidably disposed on the limiting member 1140. When the lifting adjustment member 1400 is in the locked state, it prevents the sliding sleeve 1410 from sliding relative to the limiting member 1140. Correspondingly, it prevents the drive rod 1340 connected to the sliding sleeve 1410 from sliding relative to the upper frame 1100. Therefore, the first bracket 1310 and the second bracket 1320 cannot pivot relative to each other to adjust the lifting of the frame 1000. When the lifting adjustment member 1400 is in the unlocked state, it allows the sliding sleeve 1410 to slide relative to the limiting member 1140. Correspondingly, it allows the drive rod 1340 connected to the sliding sleeve 1410 to slide relative to the upper frame 1100. Therefore, the first bracket 1310 and the second bracket 1320 can pivot relative to each other to adjust the lifting of the frame 1000. The frame 1000 also includes a first traction member 1420, one end of which is connected to a lifting adjustment release member 1500, and the other end is connected to a lifting adjustment member 1400. When the lifting adjustment release member 1500 is operated, the first traction member 1420 drives the lifting adjustment member 1400 to switch from a locked state to an unlocked state. When the lifting adjustment release member 1500 is not operated, the lifting adjustment member 1400 automatically switches from an unlocked state to a locked state. In this embodiment, a lifting adjustment release member 1500 is provided on each of the left and right sides of the upper frame 1100. Each lifting adjustment release member 1500 is connected to the lifting adjustment member 1400 through a first traction member 1420, so as to operably switch the lifting adjustment member 1400 from a locked state to an unlocked state. In other embodiments, only one lifting adjustment release member 1500 may be provided, and the lifting adjustment release member 1500 may also be provided on the front or rear side of the upper frame 1100. For the convenience of user operation, four lifting adjustment release members 1500 may also be provided, located on the front, rear and left and right sides of the upper frame 1100 respectively.

[0211] Referring to Figure 12, the lifting adjustment member 1400 includes a lifting adjustment member housing 1470 connected to the sliding sleeve 1410, and a sliding locking member 1430, a first driving member 1440, a first fixing pin 1450 and a first elastic member 1460 disposed between the lifting adjustment member housing 1470 and the sliding sleeve 1410. The sliding locking member 1430 is configured to selectively engage or disengage with the limiting member 1140. Figure 13A shows the sliding lock 1430 engaged with the limiting member 1140, and Figure 13B shows the sliding lock 1430 disengaged from the limiting member 1140. When the sliding lock 1430 is engaged with the limiting member 1140, the lifting adjustment member 1400 is locked, preventing the sliding sleeve 1410 from sliding relative to the limiting member 1140. Therefore, the first bracket 1310 and the second bracket 1320 cannot pivot relative to each other to adjust the lifting of the frame 1000. When the sliding lock 1430 is disengaged from the limiting member 1140, the lifting adjustment member 1400 is unlocked, allowing the sliding sleeve 1410 to slide relative to the limiting member 1140. Therefore, the first bracket 1310 and the second bracket 1320 can pivot relative to each other to adjust the lifting of the frame 1000.

[0212] The top of the sliding locking member 1430 is provided with a predetermined number of engaging teeth 1431, which are adapted to selectively engage with a corresponding number of the limiting grooves 1141 on the limiting member 1140 to limit the height of the upper frame 1100 relative to the lower frame 1200. In this embodiment, five engaging teeth 1431 are provided on the top of the sliding locking member 1430. In other embodiments, only one engaging tooth 1431 or any other appropriate number of engaging teeth 1431 may be provided on the top of the sliding locking member 1430. When the engaging teeth 1431 engage with the limiting grooves 1141 closer to the front end of the upper frame 1100, the height of the upper frame 1100 relative to the lower frame 1200 is limited to a lower height, and when the engaging teeth 1431 engage with the limiting grooves 1141 farther from the front end of the upper frame 1100, the height of the upper frame 1100 relative to the lower frame 1200 is limited to a higher height. That is to say, by selectively engaging the engaging teeth 1431 of the sliding locking member 1430 with different limiting grooves 1141 on the limiting member 1140, the sliding sleeve 1410 can be positioned at different positions along the limiting member 1140. When the sliding sleeve 1410 is at different positions along the limiting member 1140, the first bracket 1310 is at different pivoting angles relative to the second bracket 1320, and correspondingly, the upper frame 1100 is at different heights relative to the lower frame 1200.

[0213] Continuing to refer to FIG. 12 and combining FIGS. 14, 15A, and 15B, in these figures, for the sake of clarity, some components of the upper frame shown in FIG. 10 are omitted. The sliding locking member 1430 is connected to the first driving member 1440 by a first fixing pin 1450. First driving inclined slots 1441 are provided on opposite sides of the first driving member 1440. The first fixing pin 1450 passes through the sliding locking member 1430, and both ends of the first fixing pin 1450 are respectively slidably connected to the first driving inclined slots 1441 provided on opposite sides of the first driving member 1440. A first elastic member 1460 is provided between the sliding locking member 1430 and the lifting adjustment member housing 1470. In this embodiment, the first elastic member 1460 is a helical compression spring. In other embodiments, the first elastic member 1460 may be a wave spring, a torsion spring, or any other appropriate type of spring. Similarly, for other elastic members mentioned herein, a helical compression spring, a wave spring, a torsion spring, or any other appropriate type of spring may also be used, which will not be elaborated further.

[0214] The first end of the first traction member 1420 passes through the sliding sleeve 1410 and is connected to the first driving member 1440. When the first traction member 1420 pulls the first driving member 1440 backward, the first driving member 1440 moves backward. At this time, under the drive of the first driving inclined groove 1441, the sliding locking member 1430 moves downward along with the first fixing pin 1450, and the sliding locking member 1430 disengages from the limiting member 1140, and the first elastic member 1460 is compressed. The sliding locking member 1430 is in the disengaged position shown in FIG. 15A. When the pulling force of the first traction member 1420 on the first driving member 1440 is withdrawn, under the action of the elastic restoring force of the first elastic member 1460, the sliding locking member 1430 moves upward. At this time, the first fixing pin 1450 moves upward along with the sliding locking member 1430, and under the drive of the first fixing pin 1450, the first driving member 1440 moves forward. The sliding locking member 1430 will move upward to the engaged position shown in FIG. 15B.

[0215] The second end of the first traction member 1420 is connected to the lifting adjustment unlocking member 1500 via the first traction member connecting member 1520. By operating the lifting adjustment unlocking member 1500, the first traction member 1420 can be pulled, thereby pulling the first driving member 1440. Specifically, referring to FIG. 14, second driving inclined grooves 1510 are provided on opposite sides of the lifting adjustment unlocking member 1500. The second fixing pin 1530 passes through the first traction member connecting member 1520, and both ends of the second fixing pin 1530 are respectively slidably connected to the second driving inclined grooves 1510 provided on opposite sides of the lifting adjustment unlocking member 1500. When the lifting adjustment unlocking member 1500 is pressed to move the lifting adjustment unlocking member 1500, under the drive of the second driving inclined groove 1510, the first traction member connecting member 1520 moves forward, thereby pulling the first traction member 1420. When the pressing on the lifting adjustment unlocking member 1500 is withdrawn, the lifting adjustment unlocking member 1500 can return to its initial position under the action of the elastic restoring force of, for example, an elastic member (not shown).

[0216] It can be understood that the structures and operation modes of the lifting adjustment unlocking member 1500 and the first traction member 1420 described above are only illustrative examples, and the present disclosure is not limited thereto. Those skilled in the art can adopt any other suitable method to implement the control of the lifting adjustment member 1400 by the lifting adjustment unlocking member 1500.

[0217] According to the handcart 100 of this aspect, when a user wants to adjust the height of the upper frame 1100 relative to the lower frame 1200, the lifting adjustment release mechanism 1500 can be operated to switch the lifting adjustment mechanism 1400 from the locked state to the unlocked state, thereby allowing the first support 1310 and the second support 1320 to pivot relative to each other. Thus, the user can easily adjust the upper frame 1100 to the desired height by raising or lowering it.

[0218] Another aspect of this disclosure provides a handcart having an engaging device for engaging a portable vehicle.

[0219] Returning to Figure 1, as previously described, the trolley 100 includes a frame 1000 and a support platform 1600 disposed on top of the frame 1000. The support platform 1600 is adapted to support a portable carrier 200. The trolley 100 also includes a locking device 2000 disposed on top of the frame 1000. When the portable carrier 200 is supported on the support platform 1600, the locking device 2000 is used to secure the portable carrier 200. Referring to Figure 16, a locking lever 210 is provided at the bottom of the portable carrier 200. When the portable carrier 200 is supported on the support platform 1600, the locking device 2000 is adapted to engage the locking lever 210 to secure the portable carrier 200. The trolley 100 also includes a locking release element 2100, which can be operated to release the locking device 2000 from the locking lever 210 of the portable carrier 200. The engaging device 2000 and the engaging release element 2100 are both disposed on the upper frame of the vehicle frame 1000. Figure 17 schematically shows the upper frame 1100 on which the portable carrier 200 is mounted. Referring to Figures 18A to 18D, the engaging device 2000 includes an engaging locking element 2010, a drive block 2030, and an engaging device housing 2080. The engaging locking element 2010 is movable between a locked position and an unlocked position. When the engaging locking element 2010 is in the locked position, the engaging locking element 2010 is adapted to secure the portable carrier 200 mounted on the support platform 1600, and when the engaging locking element 2010 is in the unlocked position, the engaging locking element 2010 is adapted to release the securement of the portable carrier 200 to remove the portable carrier 200 from the support platform 1600.

[0220] Figure 18A shows the locking member 2010 in the locked position, and Figure 18C shows the locking member 2010 in the unlocked position. The locking member 2010 has a locking hook 2011. In Figure 18A, the locking hook 2011 engages with a lever 210 located at the bottom of the portable carrier 200, thereby securing the portable carrier 200 to the support platform 1600. In Figure 18C, the locking hook 2011 disengages from the lever 210, thereby allowing the portable carrier 200 to be removed from the support platform 1600. The drive block 2030 is configured to move toward the locking member 2010 when the locking / unlocking member 2100 is operated, thereby driving the locking member 2010 from the locked position to the unlocked position. For example, referring to Figures 18A and 18C, when the locking / unlocking member 2100 is operated, the drive block 2030 moves rearward and pushes the locking member 2010 rearward, causing the locking member 2010 to move from the locked position to the unlocked position. The locking device 2000 also includes a second elastic member 2040 disposed between the locking member 2010 and the locking device housing 2080. The second elastic member 2040 is adapted to bias the locking member 2010 toward the drive block 2030. When the locking member 2010 moves from the locked position to the unlocked position, the second elastic member 2040 is further compressed.

[0221] Referring to Figure 19, the handcart 100 further includes a second traction member 2120. The first end of the second traction member 2120 is connected to the drive block 2030, and the second end of the second traction member 2120 is connected to a locking / unlocking member 2100. In this embodiment, two locking / unlocking members 2100 are provided, located on opposite sides (i.e., the left and right sides) of the outer wall of the upper frame outer frame 1110. Correspondingly, two second traction members 2120 are provided. In other embodiments, only one locking / unlocking member 2100 and one second traction member 2120 may be provided.

[0222] Referring to Figure 20, the locking and releasing member 2100 has a similar structure to the lifting and adjusting locking member 1500 described above. The second end of the second traction member 2120 is connected to the second traction member connector 2130. Third driving grooves 2110 are provided on opposite sides of the locking and releasing member 2100. A third fixing pin 2140 passes through the second traction member connector 2130, and both ends of the third fixing pin 2140 are slidably connected to the third driving grooves 2110 on opposite sides of the locking and releasing member 2100. When the locking and releasing member 2100 is pressed to move it, the second traction member connector 2130 moves forward under the drive of the third driving grooves 2110, thereby pulling the second traction member 2120. When the pressure on the locking and releasing member 2100 is released, the locking and releasing member 2100 can return to its initial position under the action of, for example, the elastic restoring force of the elastic member (not shown).

[0223] Returning to Figure 19, when the locking / unlocking member 2100 is pressed, causing the second end of the second traction member 2120 to move forward, the first end of the second traction member 2120, connected to the drive block 2030, will move backward, thereby pulling the drive block 2030 backward. Driven by the drive block 2030, the locking member 2010 also moves backward to move from the locked position to the unlocked position.

[0224] Referring again to Figures 18A to 18D, the engaging device 2000 further includes a release retainer 2020, which is movable between an extended position and a retracted position. When the release retainer 2020 is in the extended position, its top end extends from the engaging device housing 2080. When the portable carrier 200 is supported on the support platform 1600, the release retainer 2020 is in the retracted position. When the portable carrier 200 is removed from the support platform 1600, the release retainer 2020 moves from the retracted position to the extended position. Specifically, when the lever 210 is placed in the engaging device 2000, the release retainer 2020 is pressed down by the lever 210, moving from the extended position to the retracted position. When the lever 210 shown in Figures 18A and 18C is placed in the engaging device 2000, the top end of the release retainer 2020 is not visible because it is pressed down into the engaging device housing 2080 by the lever 210. When the lever 210 shown in Figure 18D is removed from the engaging device 2000, the release retainer 2020 returns from the retracted position to the extended position, and therefore, the top end of the release retainer 2020 is visible.

[0225] When the release retainer 2020 is pressed down into the retracted position, it allows the locking member 2010 to move from the locked position to the release position, and then restricts its movement from the release position to the locked position. When the force is released, the release retainer 2020 moves from the retracted position to the extended position, allowing the locking member 2010 to move from the release position to the locked position. Specifically, when the release retainer 2020 is in the retracted position, the locking member 2010 is allowed to move from the locked position shown in FIG. 18A to the release position shown in FIG. 18C, but the locking member 2010 cannot move from the release position to the locked position. Only when the lever 210 is removed from the engaging device 2000, causing the release retainer 2020 to be in the extended position, can the locking member 2010 move from the release position to the locked position shown in FIG. 18D. With the locking member 2010 in the locked position as shown in Figure 18D, when the portable carrier 200 is again supported on the support platform 1600, the lever 210 will push the locking member 2010 slightly, allowing the lever 210 to enter the locking device 2000. Under the elastic restoring force of the second elastic member 2040, the locking member 2010 returns to the locked position, engaging the lever 210. The distance the locking member 2010 moves in the locked position due to the lever is less than the distance the locking member 2010 moves from the locked position to the unlocked position.

[0226] Referring again to Figure 18B, and in conjunction with Figures 21A and 21B, the engaging device 2000 further includes a third elastic element 2060, which is adapted to bias the release retainer 2020 upward, allowing the top end of the release retainer 2020 to extend from the engaging device housing 2080. When the portable carrier 200 is supported on the support platform 1600, the downward force applied by the lever 210 to the release retainer 2020 overcomes the elastic force of the third elastic element 2060, causing the release retainer 2020 to move from the extended position to the retracted position. The locking device 2000 further includes a stop 2050 slidably disposed in the release retainer 2020, and a fourth elastic member 2070 disposed between the release retainer 2020 and the stop 2050. The fourth elastic member 2070 is adapted to bias the stop 2050 downward. The lower part of the stop 2050 extends out of the release retainer 2020, and the upper part of the stop 2050 is slidably disposed in the release retainer 2020. Drive grooves 2021 are provided on opposite sides of the release retainer 2020. A fourth fixing pin 2022 passes through the upper part of the stop 2050, and both ends of the fourth fixing pin 2022 are slidably connected to the drive grooves 2021 provided on opposite sides of the release retainer 2020. In this embodiment, the stop is in the form of a pin, which can also be called a "stop pin" or a "locking pin". It is understood that although only one release retainer 2020 and one stop 2050 are provided in this embodiment, in other embodiments, multiple release retainers 2020 and a corresponding number of stops 2050 may be provided as needed. In this embodiment, when the release retainer 2020 is in the retracted position, the drive block 2030 is adapted to hold the locking member 2010 in the release position. Specifically, when the release retainer 2020 is in the retracted position, the stop 2050 is adapted to engage with the drive block 2030. When the drive block 2030 engages with the stop 2050, the drive block 2030 prevents the locking member 2010 from moving from the release position to the locked position.

[0227] The drive block 2030 is provided with a stop engagement member, which is adapted to engage with the stop member 2050. In this embodiment, the stop engagement member is a locking hole 2031, which is adapted to engage with the bottom end of the stop member 2050. For example, when the release retainer 2020 is in the retracted position, when the locking release member 2100 is pressed to pull the drive block 2030, causing the locking member 2010 to move from the locked position shown in FIG. 18A to the unlocked position shown in FIG. 18C under the drive of the drive block 2030, the locking hole 2031 aligns with the stop member 2050, and the stop member 2050 moves downward under the elastic restoring force of the fourth elastic member 2070 and engages with the locking hole 2031. At this time, since the stop 2050 engages with the locking hole 2031, the stop 2050 prevents the drive block 2030 from moving. Therefore, when the locking release member 2100 is released, even if the locking member 2010 pushes against the drive block 2030 under the elastic restoring force of the second elastic member 2040, it cannot push the drive block 2030. Thus, the locking member 2010 remains in the released position. When the latch 210 moves out of the locking device 2000, causing the release retainer 2020 to move from the compressed position to the extended position, the drive groove 2021 drives the stop 2050 to move upward through the fourth fixing pin 2022, so that the bottom end of the stop 2050 is above the drive block 2030 and spaced apart from the drive block 2030. At this time, since the stop 2050 is disengaged from the locking hole 2031, the movement of the drive block 2030 is no longer blocked by the stop 2050. Therefore, the locking member 2010 can push the drive block 2030 under the action of the elastic restoring force of the second elastic member 2040, and move from the unlocked position to the locked position as shown in Figure 18C.

[0228] According to the handcart 100 of this aspect, when a user wants to remove the portable carrier 200 from the support platform 1600 ±, the locking and unlocking member 2010 can be moved from the locked position to the unlocked position by operating the locking and unlocking member 2100 once. Before the locking lever 210 is removed from the locking device 2000, the user does not need to operate the locking and unlocking member 2100, and the locking and unlocking member 2010 remains in the unlocked position, thus facilitating the user to remove the portable carrier 200 from the support platform 1600 ±. After the portable carrier 200 is removed, the locking and unlocking member 2010 will pop out again from the locking device housing 2080.

[0229] It is understood that the locking device structure proposed in this aspect can be applied to the handcart proposed in any aspect of this disclosure.

[0230] Another aspect of this disclosure provides a handcart with a driver that can be folded up separately.

[0231] Referring to Figures 22 to 24, the handcart 100 includes a frame 1000 and a handle 3000 disposed on the frame 1000. A user can push the handcart 100 by gripping the handle 3000. The frame 1000 includes an upper frame 1100, a lower frame 1200, and a support mechanism 1300 disposed between the upper frame 1100 and the lower frame 1200. Through pivoting between the components of the support mechanism, the upper frame 1100 can be raised and lowered relative to the lower frame 1200 to switch the frame 1000 between an extended and a folded state. The handle 3000 is pivotally connected to the lower frame 1200 and is pivotable relative to the frame 1000 between an extended and a folded position. Figure 22 shows the rider 3000 in the extended position, Figure 24 shows the rider 3000 in the folded position, and Figure 23 shows the rider 3000 between the extended and folded positions (i.e., in the process of folding or unfolding). In this embodiment, the pivoting of the rider 3000 relative to the frame 1000 is independent of the lifting and lowering movement of the upper frame 1100. That is, the folding or unfolding of the rider 3000 is not related to the folding or unfolding of the frame 1000. After folding the rider 3000 separately, the frame 1000 can be folded further to achieve the overall folding of the trolley 100, or the frame 1000 can be folded first, and then the rider 3000 can be folded to achieve the overall folding of the trolley 100. Figure 25 shows the trolley 100 after overall folding, wherein the rider 3000 is in the folded position and the frame 1000 is in the folded state. This disclosure does not restrict the order in which the rider 3000 is retracted and the frame 1000 is retracted. The rider 3000 can be retracted first and then the frame 1000 can be retracted, or the frame 1000 can be retracted first and then the rider 3000 can be retracted. Similarly, this disclosure does not restrict the order in which the rider 3000 is deployed and the frame 1000 is deployed.

[0232] As shown in Figure 24, when the rider 3000 is in the folded position, the rider 3000 is generally parallel to the lower frame 1200. In this embodiment, the length of the rider 3000 is adjustable. When the rider 3000 is in the folded position, the length of the rider 3000 can be shortened to reduce the space occupied by the folded trolley 100.

[0233] Referring to Figure 26A, the upper frame 1100 is provided with a handle 1700. As described above, the handle 1700 can be gripped by a user to apply an upward or downward force to the upper frame 1100, thereby facilitating the raising or lowering of the upper frame 1100. In this embodiment, the handle 1700 is retractable. During the pivoting of the rider 3000 relative to the frame 1000, the handle 1700 is adapted to be compressed so as not to interfere with the pivoting of the rider 3000 relative to the frame 1000, thus not affecting the folding of the trolley 100. In particular, even when the rider 3000 is at its minimum length, the handle 1700 can be compressed to prevent interference with the rider 3000 during the movement of the rider 3000 relative to the frame 1000. Referring to Figure 26B, the handle 1700 is slidably disposed on the upper frame 1100. A fifth elastic element 1710 is provided in the handle 1700. The fifth elastic element 1710 is fixed to the upper frame HOOo by a fastener such as a fixing pin. The extension and retraction of the handle 1700 can be achieved by the compression and elastic recovery of the fifth elastic element 1710 under force. It is understood that the extension and retraction of the handle 1700 can also be achieved by any other suitable means known in the art, and this disclosure does not limit it.

[0234] Referring to Figures 22, 27, and 28, the handcart 100 also includes a crossbar 3100 and a connecting rod 3200. The crossbar 3100 is located below the lower frame 1200 and is movable along the lower frame 1200. Specifically, the crossbar 3100 extends in the left-right direction below the lower frame 1200 and is movable relative to the lower frame 1200 in the front-back direction. In this embodiment, two connecting rods 3200 are provided, located on the left and right sides of the frame 1000, respectively. In this embodiment, the left-side driver pivot mechanism and the right-side driver pivot mechanism are mutually opposite. The following description mainly focuses on one side; the other side has the same structure and will not be repeated. The first end of the connecting rod 3200 is connected to the crossbar 3100, and the second end of the connecting rod 3200 is pivotally connected to the lower part of the driver 3000. During the pivoting of the rider 3000 relative to the frame 1000, the rider 3000 drives the crossbar 3100 to move along the lower frame 1200, specifically, to move relative to the lower frame 1200 in the front-rear direction.

[0235] The trolley 100 also includes a base plate 3300 disposed at the bottom of the lower frame 1200. Guide grooves 3310 are respectively provided on the left and right sides of the base plate 3300, extending in the front-rear direction. Two sliders 3110 are slidably connected to the two guide grooves 3310. A crossbar 3100 is rotatably connected to the sliders 3110. Specifically, the sliders 3110 and the fixed cover 3120 enclose a receiving cavity through which the crossbar 3100 passes, allowing the crossbar 3100 to rotate within the receiving cavity. Therefore, the crossbar 3100 is rotatable relative to the sliders 3110 while moving in the front-rear direction through the sliding engagement of the sliders 3110 and the guide grooves 3310. In this embodiment, the first end of the connecting rod 3200 is fixedly connected to the crossbar 3100. Since the crossbar 3100 can rotate relative to the slider 3110, the connecting rod 3200 can pivot relative to the slider 3110. In other embodiments, the crossbar 3100 can be rotatably connected to the first end of the connecting rod 3200, and the crossbar 3100 can be fixedly connected to the slider 3110. In this way, the connecting rod 3200 can also pivot relative to the slider 3110.

[0236] In Figures 22 and 27, the positions of the pivot points (i.e., the sixth pivot point P6, the seventh pivot point P7, and the eighth pivot point P8) around which the rider 3000 and the connecting rod 3200 pivot during the pivoting of the rider 3000 relative to the frame 1000 are schematically marked. The lower end of the rider 3000 is pivotally connected to the lower frame 1200 at the sixth pivot point P6. The first end of the connecting rod 3200 is pivotally connected to the lower part of the rider 3000 at the seventh pivot point P7. The second end of the connecting rod 3200 is pivotally connected to the slider 3110 via the crossbar 3100 at the eighth pivot point P8. During the pivoting process of the rider 3000 relative to the frame 1000, the rider 3000 drives the crossbar 3100 to move along the lower frame 1200 via the connecting rod 3200. The position of the sixth pivot point P6 in the lower frame 1200 remains fixed. The seventh pivot point P7 rotates along an arc centered on the sixth pivot point P6. The eighth pivot point P8 moves along the lower frame 1200. Specifically, when the rider 3000 pivots from the unfolded position to the retracted position, the eighth pivot point P8 moves from back to front along the lower frame 1200. When the rider 3000 pivots from the retracted position to the extended position, the eighth pivot point P8 moves from front to back along the lower frame 1200.

[0237] Referring to Figures 28 to 30, the trolley 100 also includes a handlebar deployment locking device 3400, which is disposed on the lower frame 1200, specifically extending downward through the base plate 3300. When the handlebar 3000 pivots to the deployed position, the crossbar 3100 can be locked by the handlebar deployment locking device 3400. Specifically, during the pivoting process of the handlebar 3000 from the folded position to the deployed position (i.e., from front to back), the handlebar 3000 drives the crossbar 3100 to move from front to back via the connecting rod 3200. Driven by the crossbar 3100, the slider 3110 slides along the guide groove 3310 from the front end to the rear end of the guide groove 3310. When the slider 3110 reaches the rear end of the guide groove 3310, the slider 3110 can no longer move backward, and correspondingly, the crossbar 3100 can no longer move backward. At this point, the rider 3000 cannot pivot further backward and is in the deployed position, as shown in Figure 29. In this situation, the rider deployment locking device 3400 can lock the crossbar 3100, keeping the rider 3000 in the deployed position. Referring to Figure 22, when the crossbar 3100 is locked and the rider 3000 is kept in the deployed position, the components between the sixth pivot point P6, the seventh pivot point P7, and the eighth pivot point P8 can form a stable triangular support structure.

[0238] During the pivoting process of the rider 3000 from the extended position to the retracted position (i.e., from rear to front), the rider 3000 drives the crossbar 3100 to move from rear to front via the connecting rod 3200. Under the action of the crossbar 3100, the slider 3110 slides along the guide groove 3310 from the rear end to the front end. When the slider 3110 reaches the front end of the guide groove 3310, the slider 3110 can no longer move forward, and correspondingly, the crossbar 3100 can no longer move forward. At this time, the rider 3000 is in the retracted position, as shown in Figure 30. Referring to Figures 24 and 25, when the rider 3000 is in the retracted position, the rider 3000 is generally parallel to the lower frame 1200, and the connecting rod 3200 is also parallel to the lower frame 1200 and located below the rider 3000.

[0239] Referring to Figures 31 to 33, the trolley 100 also includes a handlebar retraction operation 3500, which is operable to release the handlebar extension locking device 3400 from locking the crossbar 3100. When the handlebar 3000 is locked in the extended position by the handlebar extension locking device 3400, to retract the handlebar 3000, the handlebar extension locking device 3400 must first be operated to release the lock on the crossbar 3100. In this embodiment, the rider retraction operation 3500 is disposed on the rider 3000. The rider 3000 includes two push rods 3010 extending generally parallel to each other and a grip bar 3020 extending between the top ends of the two push rods 3010. The bottom end of the push rod 3010 is pivotally connected to the lower frame 1200, and the second end of the connecting rod 3200 is pivotally connected to the lower part of the push rod 3010. Both push rods 3010 are provided with the rider retraction operation 3500. The rider retraction operation 3500 operates the rider to unfold the locking device 3400 through a third traction member 3510. The following description uses the rider retraction operation 3500 disposed on one of the push rods 3010 as an example. The other push rod 3010 has the same structure and will not be described again.

[0240] The push rod 3010 includes an upper push rod 3011 and a lower push rod 3012, with the upper push rod 3011 telescopically sleeved within the lower push rod 3012. In this embodiment, the rider retraction operation member 3500 is in the form of a sleeve. A rod sleeve 3013 is mounted on the top of the lower push rod 3012, and the rider retraction operation member 3500 is slidably disposed on the rod sleeve 3013. The upper push rod 3011 passes through the rider retraction operation member 3500 and the rod sleeve 3013 and is inserted into the lower push rod 3012. The first end of the third traction member 3510 is fixed to the rider retraction operation member 3500 by a traction member fixing pin 3511, and the rider retraction operation member 3500 can be operated to move upward relative to the upper push rod 3011. The left image in Figure 33 shows the rider retraction control 3500 when it is not being operated, and the right image in Figure 33 shows the rider retraction control 3500 when it is being operated. When the rider retraction control 3500 is pulled upward, it will cause the first end of the third traction member 3510 to move upward.

[0241] The second end of the third traction member 3510 is connected to the rider deployment locking device 3400. When the first end of the third traction member 3510 moves upward, the second end of the third traction member 3510 will move accordingly to change the state of the rider deployment locking device 3400. In this embodiment, the third traction member 3510 is connected to the rider deployment locking device 3400 via the traction member fixing seat 1240, which will be described below. The traction member fixing seat 1240 is fixed to the lower frame 1200, and the rider deployment locking device 3400 is fixed to the lower frame 1200 via the locking device fixing rod 1230. In Figure 31, the traction member fixing seat 1240 and the rider deployment locking device 3400 are covered by the outer cover 3320 provided on the base plate 3300 and are therefore not visible.

[0242] Referring to Figures 34 to 38, the rider deployment locking device 3400 includes an inner cover 3410, a locking member 3420, and a second drive member 3430. The inner cover 3410 is fixed to the lower frame 1200 by a locking device fixing rod 1230. The locking member 3420 is slidably disposed within the inner cover 3410 and is movable between a locked position and a released position. When the locking member 3420 is in the locked position, it engages the crossbar 3100 to prevent the crossbar 3100 from moving along the lower frame 1200 in the front-rear direction; at this time, the crossbar 3100 is locked by the rider deployment locking device 3400. When the locking member 3420 is in the released position, it disengages from the crossbar 3100 to allow the crossbar 3100 to move along the lower frame 1200 in the front-rear direction. The second drive member 3430 is disposed outside the inner cover 3410 and located on the base plate 3300. The second drive member 3430 is movable relative to the inner cover 3410 in the front-rear direction. The second end of the third traction member 3510 is connected to the second drive member 3430. Specifically, as shown in FIG35, when the first end of the third traction member 3510 is connected to the rider retraction operation member 3500 inside the rider 3000, the second end of the third traction member 3510 extends from the bottom end of the rider 3000 and is connected to the second drive member 3430 via the traction member fixing seat 1240. The traction member fixing seat 1240 is adapted to change the path of the third traction member 3510 such that when the first end of the third traction member 3510 is driven upward by the rider retraction operation member 3500, the second end of the third traction member 3510 can move backward, thereby pulling the second drive member 3430 backward.

[0243] The inner cover 3410 has a front vertical groove 3411 and a rear vertical groove 3412 on opposite sides, and the second driving member 3430 has a front driving inclined groove 3431 and a rear driving inclined groove 3432 on opposite sides. The front fixing pin 3441 and the rear fixing pin 3442 pass through the front and rear parts of the engaging member 3420, respectively. The two ends of the front fixing pin 3441 pass through the front vertical groove 3411 and the front driving inclined groove 3431 in sequence, and are slidable along the front vertical groove 3411 and the front driving inclined groove 3431. The two ends of the rear fixing pin 3442 pass through the rear vertical groove 3412 and the rear driving inclined groove 3432 in sequence, and are slidable along the rear vertical groove 3412 and the rear driving inclined groove 3432. An elastic element is provided between the inner cover 3410 and the engaging member 3420, including a front elastic element 3451 located between the front portion of the inner cover 3410 and the front portion of the engaging member 3420, and a rear elastic element 3452 located between the rear portion of the inner cover 3410 and the rear portion of the engaging member 3420. The front elastic element 3451 and the rear elastic element 3452 are adapted to bias the engaging member 3420 downward.

[0244] Referring to Figures 39A and 39B, when the third traction member 3510 pulls the second driving member 3430 backward, the second driving member 3430 moves backward. At this time, driven by the front driving groove 3431 and the rear driving groove 3432, the front fixing pin 3441 and the rear fixing pin 3442 slide upward along the front vertical groove 3411 and the rear vertical groove 3412 respectively. The engaging member 3420 moves upward with the front fixing pin 3441 and the rear fixing pin 3442, and the engaging member 3420 disengages from the crossbar 3100. The front elastic member 3451 and the rear elastic member 3452 are compressed. The engaging member 3420 is in the release position shown in Figure 39B. When the pulling force of the third traction member 3510 on the second driving member 3430 is released, the engaging member 3420 moves downward under the elastic restoring force of the front elastic member 3451 and the rear elastic member 3452. At this time, the front fixing pin 3441 and the rear fixing pin 3442 move downward with the engaging member 3420, and the second driving member 3430 moves forward under the drive of the front fixing pin 3441 and the rear fixing pin 3442. The engaging member 3420 will move downward to the locked position shown in Figure 39A.

[0245] According to the trolley 100 of this invention, the folding or unfolding of the rider 3000 is independent of the folding or unfolding of the frame 1000; therefore, the rider 3000 can be folded or unfolded independently. When the rider 3000 is in the unfolded position, it can be locked and provides stable support, which is beneficial for the user to push the trolley 100.

[0246] It is understood that the driver-related mechanisms proposed in this aspect can be applied to the handcarts proposed in any aspect of this disclosure.

[0247] Another aspect of this disclosure provides a handcart with a trolley.

[0248] Referring to Figures 40 to 44, the trolley 100 includes a frame 1000 and a handle 3000 disposed on the frame 1000. A user can push the trolley 100 by gripping the handle 3000. The frame 1000 includes an upper frame 1100, a lower frame 1200, and a support mechanism 1300 disposed between the upper frame 1100 and the lower frame 1200. Through pivoting between the components of the support mechanism, the upper frame 1100 can be raised and lowered relative to the lower frame 1200 to adjust the height of the frame 1000. The upper frame 1100 is suitable for carrying a portable carrier 200. The trolley 100 also includes a slide 4000, which is connected to the upper frame 1100 and is switchable between a folded state and an unfolded state. When the slide 4000 is in the extended state, at least a portion of the slide 4000 is located in front of the upper frame 1100, and the portion of the slide 4000 located in front of the upper frame 1100 is adapted to carry the portable vehicle 200. Specifically, as shown in Figures 40 and 41, the slide 4000 is pivotally connected to the front end of the upper frame 1100 and is pivotable relative to the upper frame 1100. When the slide 4000 is in the retracted state (as shown in Figure 40), the slide 4000 is located below the upper frame 1100, and when the slide 4000 is in the extended state, the slide 4000 is substantially flush with the upper frame 1100 (as shown in Figure 41). In this embodiment, the state switching of the slide 4000 between the retracted and extended states is achieved by the pivoting of the slide 4000 relative to the upper frame 1100. The pivot connection between the slide plate 4000 and the upper frame 1100 can be implemented in any suitable manner known in the art, and this disclosure does not limit it.

[0249] Referring to Figure 42, when the trailer 4000 is in the unfolded state, it can be placed on the seat surface 310 of the vehicle seat 300, thereby facilitating the user to push the portable carrier 200 supported on the upper frame 1100 onto the seat surface 310 of the vehicle seat 300 to secure the portable carrier 200 to the vehicle seat 300. Specifically, when the user needs to move the portable carrier 200 loaded on the trolley 100 onto the vehicle seat 300, the user can unfold the trailer 4000 and move the trolley 100 to the front or side of the vehicle seat 300. By adjusting the height of the frame 1000, the trailer 4000 can be positioned precisely on the seat surface 310 of the vehicle seat 300. The user can use the transition between the trailer 4000 and the seat surface 310 of the vehicle seat 300 to push the portable vehicle 200, which is supported by the upper frame 1100, directly into the vehicle seat 300, thus saving effort.

[0250] Referring to Figures 43 and 44, in this embodiment, the slide 4000 is configured to be retractable relative to the upper frame 1100. The slide 4000 is slidably disposed in the front portion of the upper frame 1100. When the slide 4000 is in the retracted state, the slide 4000 is retracted within the upper frame 1100 (as shown in Figure 43). When the slide 4000 is in the extended state, at least a portion of the slide 4000 extends from the front end of the upper frame 1100. Specifically, when the slide 4000 is in the retracted state, the user can pull the slide 4000 out from the front end of the upper frame 1100 to switch the slide 4000 to the extended state.

[0251] In other embodiments, the tray 4000 can be detachably connected to the upper frame 1100. When the tray 4000 is not needed, it can be stored in another location on the trolley 100 or on the outside of the trolley 100. When the tray 4000 is needed, it can be mounted to the front of the upper frame 1100.

[0252] According to the trolley 100 of this aspect, when it is necessary to move the portable carrier 200 loaded on the trolley 100 to the vehicle seat 300, the user can easily push the portable carrier 200 carried on the upper frame 1100 into the vehicle seat 300 through the transition between the upper frame 1100 of the slide 4000 and the seat surface 310 of the vehicle seat 300. It is understood that the slide-related structure proposed in this aspect can be applied to the trolley proposed in any aspect of this disclosure, and the slide can also be designed to be detachable.

[0253] Another aspect of this disclosure provides a handcart with side panels.

[0254] Referring to Figure 45, the handcart 100 includes a frame 1000, the frame 1000 including an upper frame 1100 located at the top of the frame 1000, a lower frame 1200 located at the bottom of the frame 1000, and a support mechanism 1300 disposed between the upper frame 1100 and the lower frame 1200. The frame 1000 can be the frame 1000c described in any aspect of this disclosure.

[0255] Referring to Figures 46 and 47, the trolley 100 further includes an upper cover 5100, a lower cover 5200, and side panels 5300. The upper cover 5100 is disposed on the upper frame 1100 and covers the top and sides of the upper frame 1100. The lower cover 5200 is disposed on the lower frame 1200 and covers the bottom and sides of the lower frame 1200. The side panels 5300 are disposed between the upper cover 5100 and the lower cover 5200. The side panels 5300, together with the upper cover 5100 and the lower cover 5200, enclose the frame 1000, preventing the frame 1000 from being exposed and thus preventing pets or young children from being pinched by the movable parts of the frame 1000. Side panel 5300 is detachably connected to top cover 5100. Specifically, the top of side panel 5300 is detachably connected to top cover 5100. The bottom of side panel 5300 may or may not be connected to bottom cover 5200. When the bottom of side panel 5300 is not connected to bottom cover 5200, the bottom of side panel 5300 at least reaches or at least partially covers the side wall of bottom cover 5200. This detachable connection allows side panel 5300 to be easily removed from trolley 100 for cleaning.

[0256] Referring to Figures 48A and 48B, the top cover 5100 includes a foam material layer 5110 and a seat fabric layer 5120. The seat fabric layer 5120 is attached to the foam material layer 5110 and is located on the outside of the foam material layer 5110. That is, the inner side of the top cover 5100 is the foam material layer 5110, and the outer side is the seat fabric layer 5120. The foam material layer 5110 is formed of foam material formed by foaming, for example, the foam material layer 5110 can be formed of polypropylene foam (EPP). The seat fabric layer 5120 is formed of a seat fabric made of materials such as nylon, polyester fiber, cotton cloth, or fleece. The seat fabric can combine aesthetics, comfort, and easy cleaning. The seat fabric layer 5120 can be bonded to the foam material layer 5110 using adhesive materials such as glue or double-sided tape. The lower cover 5200 can have the same structure as the upper cover, that is, it is also a structure with the foam material layer 5110 on the inside and the seat fabric layer 5120 on the outside.

[0257] The side panel 5300 is detachably connected to the seat fabric layer 5120 of the top cover 5100. For example, the seat fabric layer 5120 extends downward beyond the foam material layer 5110, such that the bottom end of the seat fabric layer 5120 is closer to the lower frame 1200 than the bottom end of the foam material layer 5110. The bottom end of the seat fabric layer 5120 is connected to the top end of the side panel 5300 by a zipper. The side panel 5300 can be quickly removed or installed by opening or closing the zipper. The bottom end of the seat fabric layer 5120 of the top cover 5100 and the top end of the side panel 5300 can also be connected by detachable connectors such as buttons or snaps. As shown in Figure 46, in this embodiment, the side panel 5300 has an accordion-style structure. During the lifting and lowering of the frame 1000, the side panel 5300 will extend or fold in the vertical direction accordingly as the height of the upper frame 1100 relative to the lower frame 1200 changes.

[0258] The side panel 5300 can also be detachably connected to the seat fabric layer 5120 of the lower cover 5200. In particular, the connection between the bottom end of the side panel 5300 and the top end of the seat fabric layer 5120 of the lower cover 5200 can be similar to the connection between the top end of the side panel 5300 and the bottom end of the seat fabric layer 5120 of the upper cover 5100, which will not be described in detail here.

[0259] In this embodiment, the side panel 5300 is made of a seat fabric to facilitate the formation of an accordion-like structure. The side panel 5300 may be made of the same material as the seat fabric layer 5120 of the upper cover 5100 or the lower cover 5200, or it may be made of a different material.

[0260] In another embodiment, referring to FIG49, the side panel 5300 is made of elastic fabric. The elastic fabric is composed of elastic fibers such as spandex. Due to the significant stretchability of the elastic fabric itself, the side panel 5300 does not need to have a folding structure to accommodate the lifting and lowering of the frame 1000. With the use of elastic fabric, the appearance of the vehicle body will appear flatter when the frame 1000 is in the unfolded state.

[0261] In other embodiments, the side panel 5300 may also be made of a thin, soft gel, for example, a soft polymer material. In particular, the side panel 5300 may be made of flexible polyvinyl chloride (PVC). When the side panel 5300 is made of PVC, it may be transparent or translucent.

[0262] According to the stroller 100 of this invention, the frame 1000 is enclosed by a combination of side panels 5300, top cover 5100, and bottom cover 5200, which can prevent pets or young children from being pinched by the movable parts of the frame 1000. In addition, since the side panels 5300 can be easily and quickly disassembled and assembled, it is convenient to clean the side panels 5300.

[0263] It is understood that the side panel structure proposed in this aspect can be applied to the handcart proposed in any aspect of this disclosure.

[0264] Another aspect of this disclosure provides a handcart with a liftable frame.

[0265] Figure 50 illustrates a handcart 600 according to an embodiment of the present disclosure. The handcart 600 includes a frame 6000 and a handle 6900 disposed on the frame 6000. A user can push the handcart 600 by gripping the handle 6900. Similar to the frame 1000 described in the above embodiment, the frame 6000 is also height-adjustable. Referring to Figure 51, the frame 6000 includes an upper frame 6100, a lower frame 6200, and a support mechanism 6300 disposed between the upper frame 6100 and the lower frame 6200. The handle 6900 is disposed on the upper frame 6100 and is pivotable relative to the upper frame 6100 to switch between an extended position and a folded position. Figure 50 shows the handle 6900 in the extended state. The handle 6900 is pivotable relative to the upper frame 6100 to switch from the extended position to the folded position. When the rider 6900 is in the retracted position, as shown in Figure 52C, the rider 6900 is generally located on the side of the upper frame 6100.

[0266] A carrying platform 6800 is provided on the top of the upper frame 6100, which is used to carry portable vehicles. A locking device 7000 is also provided on the top of the upper frame 6100. When a portable vehicle is carried on the carrying platform 6800, the locking device 7000 is used to secure the portable vehicle. Portable vehicles include infant carriers, baby sleeping boxes, pet carriers, pet sleeping boxes, etc., used to carry infants or pets. Depending on the vehicle loaded on it, the stroller 600 can function as either a baby stroller for carrying infants or a pet stroller for carrying pets. It is understood that the carrying platform 6800 can also be used to carry goods; in this case, the stroller 600 functions as a goods stroller for carrying goods.

[0267] The lower frame 6200 is provided with a plurality of rollable wheels, such as casters, to enable the trolley 600 to move. In this embodiment, the lower frame 6200 is provided with two pairs of wheels, one pair of which is located at the front of the lower frame 6200 and the other pair of which is located at the rear of the lower frame 6200. At least one pair of these two pairs of wheels is a swivel wheel. In other embodiments, any number and any similar number of wheels can be provided as needed, and the wheels can be positioned in any suitable location.

[0268] The frame 6000 can switch between an extended state and a folded state. When the frame 6000 is in the extended state, it can be adjusted to multiple heights. Referring to Figures 52A to 52C, in Figures 52A and 52B, the frame 6000 is in the extended state, while in Figure 52C, it is in the folded state. When the frame 6000 is in the extended state, it can be adjusted to one of multiple heights as needed, to facilitate, for example, the user mounting or detaching the portable vehicle from the support platform 6800, or, while the support platform 6800 carries the portable vehicle, the user taking an infant or pet into or out of the portable vehicle. For example, referring to Figure 52A, the frame 6000 has a first height hl. In this document, the height of the frame 6000 refers to the distance between the top surface of the frame 6000 (i.e., the surface where the support platform 6800 is located) and the bottom surface of the frame 6000. When the user feels that the first height h1 is too high, the frame 6000 can be lowered – for example, by lowering the frame 6000 to a second height h2 as shown in Figure 52B. When the frame 6000 is adjusted from the first height h1 shown in Figure 52A to the second height h2 shown in Figure 52B, the height of the support platform 6800 will decrease; conversely, when the frame 6000 is adjusted from the second height h2 shown in Figure 52B to the first height h1 shown in Figure 52A, the height of the support platform 6800 will increase. It can be understood that when the frame 6000 is adjusted to its lowest height, the frame 6000 is in a retracted state, as shown in Figure 52C.

[0269] The lifting and lowering of the frame 6000 is achieved through the support mechanism 6300. The support mechanism 6300 may include a single X-shaped support mechanism or multiple X-shaped support mechanisms stacked together. Each X-shaped support mechanism includes a first support and a second support pivotally connected to each other. The support mechanism 6300 including a single X-shaped support mechanism can be referenced to the support mechanism 1300 described in the above embodiment, and will not be repeated here. In this embodiment, the support mechanism 6300 includes two X-shaped support mechanisms, and the arrangement of the two X-shaped support mechanisms will be described in detail below. It is understood that in other embodiments, the support mechanism 6300 may include three or more X-shaped support mechanisms arranged in a similar manner.

[0270] Returning to Figure 51, the support mechanism 6300 includes a first X-shaped support mechanism 6310 and a second X-shaped support mechanism 6320. The first X-shaped support mechanism 6310 is located above the second X-shaped support mechanism 6320. The first X-shaped support mechanism 6310 includes a first upper support 6311 and a second upper support 6312 pivotally connected to each other, with the first upper support 6311 and the second upper support 6312 pivotally connected to each other at approximately their respective longitudinal center positions. The second X-shaped support mechanism 6320 includes a first lower support 6321 and a second lower support 6322 pivotally connected to each other, with the first lower support 6321 and the second lower support 6322 pivotally connected to each other at approximately their respective longitudinal center positions. The front end of the first lower support 6321 is pivotally connected to the front end of the second upper support 6312, and the rear end of the second lower support 6322 is pivotally connected to the lower end of the first upper support 6311.

[0271] The pivoting of the first upper support 6311 relative to the second upper support 6312 will drive the pivoting of the first lower support 6321 relative to the second lower support 6322, and the pivoting of the first lower support 6321 relative to the second lower support 6322 will also drive the pivoting of the first upper support 6311 relative to the second upper support 6312. The pivoting of the first upper support 6311 relative to the second upper support 6312 and the pivoting of the first lower support 6321 relative to the second lower support 6322 can raise or lower the upper frame 6100. For example, when the first upper support 6311 and the second upper support 6312 pivot relative to each other such that the front end of the first upper support 6311 and the rear end of the second upper support 6312 move away from each other, the first lower support 6321 and the second lower support 6322 pivot relative to each other under the influence of the first upper support 6311 and the second upper support 6312, such that the front end of the first lower support 6321 and the front end of the second lower support 6322 move away from each other, thereby raising the upper frame 6100. When the first upper support 6311 and the second upper support 6312 pivot relative to each other such that the front end of the first upper support 6311 and the rear end of the second upper support 6312 move closer to each other, the pivoting of the first upper support 6311 and the second upper support 6312... Driven by the pivot, the first lower support 6321 and the second lower support 6322 pivot relative to each other, causing the front ends of the first lower support 6321 and the front ends of the second lower support 6322 to move closer to each other, thereby lowering the upper frame 6100°.

[0272] In this embodiment, the first X-shaped support mechanism 6310 and the second X-shaped support mechanism 6320 have the same structure. The first upper support 6311 and the second upper support 6312 of the first X-shaped support mechanism 6310 each include two parallel support rods, and at least one fixed rod connects the two support rods. The first lower support 6321 and the second lower support 6322 of the second X-shaped support mechanism 6320 also each include two parallel support rods, and at least one fixed rod connects the two support rods. Specifically, the first upper support 6311 includes a first upper support rod 6311a and a second upper support rod 6311b; the second upper support 6312 includes a third upper support rod 6312a and a fourth upper support rod 6312b; the first lower support 6321 includes a first lower support rod 6321a and a second lower support rod 6321b; and the second lower support 6322 includes a third lower support rod 6322a and a fourth lower support rod 6322b. The structures of the first X-type support mechanism 6310 and the second X-type support mechanism 6320 are similar to those of the support mechanism 1300 described in the above embodiment, and will not be repeated here.

[0273] In this embodiment, the front end of the first upper bracket 6311 is pivotally connected to the front part of the upper frame 6100, and the rear end of the second upper bracket 6312 is slidably and rotatably connected to the rear part of the upper frame 6100 relative to the upper frame 6100. The front end of the second lower bracket 6322 is pivotally connected to the front part of the lower frame 6200, and the rear end of the first lower bracket 6321 is slidably and rotatably connected to the rear part of the lower frame 6200 relative to the lower frame 6200. In this embodiment, the bracket mechanism 6300 has a left-right symmetrical structure. The following description will take one side of the bracket mechanism 6300 as an example; the other side has the same structure and will not be described again.

[0274] Figure 53A is a schematic diagram of a partial structure of the handcart shown in Figure 50, and Figure 53B is a schematic diagram of the partial structure of the handcart shown in Figure 53A from another perspective after the lower frame shell has been removed. In Figures 53A and 53B, the positions of the pivot points (i.e., the first pivot point p1, the second pivot point p2, the third pivot point p3, the fourth pivot point p4, the fifth pivot point p5, the sixth pivot point p6, the seventh pivot point p7, and the eighth pivot point p8) around which the components of the support mechanism 6300 pivot during the lifting and lowering of the frame 6000 are schematically marked. The first upper support 6311 and the second upper support 6312 of the first X-shaped support mechanism 6310 are pivotally connected to the third pivot point p3, and the first lower support 6321 and the second lower support 6322 of the second X-shaped support mechanism 6320 are pivotally connected to the sixth pivot point p6. The rear end of the first upper support 6311 is pivotally connected to the rear end of the second lower support 6322 at the fifth pivot point p5, and the front end of the second upper support 6312 is pivotally connected to the front end of the first lower support 6321 at the fourth pivot point p4. The front end of the first upper support 6311 is pivotally connected to the upper frame 6100 at the first pivot point p1, and the front end of the second lower support 6322 is pivotally connected to the lower frame 6200 at the seventh pivot point p7. During the lifting and lowering of the frame 6000, the position of the first pivot point p1 in the upper frame 6100 does not change, and the position of the seventh pivot point p7 in the lower frame 6200 does not change. That is, during the lifting and lowering of the frame 6000, the front end of the first upper support 6311 only pivots around the first pivot point p1 and does not move relative to the upper frame 6100, and the front end of the second lower support 6322 only pivots around the seventh pivot point p7 and does not move relative to the lower frame 6200.

[0275] The second pivot point p2 around which the rear end of the second upper support 6312 pivots is slidable along the upper frame 6100, and the eighth pivot point p8 around which the rear end of the first lower support 6321 pivots is slidable along the lower frame 6200. During the lifting of the frame 6000, the second pivot point p2 will slide along the upper frame 6100 from back to front (i.e., toward the first pivot point p1), and the eighth pivot point p8 will slide along the lower frame 6200 from back to front (i.e., toward the seventh pivot point p7); during the lowering of the frame 6000, the second pivot point p2 will slide along the upper frame 6100 from front to back (i.e., away from the first pivot point p1), and the eighth pivot point p8 will slide along the lower frame 6200 from front to back (i.e., away from the seventh pivot point p7). In other words, during the lifting and lowering of the frame 6000, the rear end of the second upper bracket 6312, in addition to pivoting around the second pivot point P2, also slides along the upper frame 6100, and the rear end of the first lower bracket 6321, in addition to pivoting around the eighth pivot point P8, also slides along the lower frame 6200. Through the sliding of the rear ends of the second upper bracket 6312 and the first lower bracket 6321 relative to the upper frame 6100 and lower frame 6200 respectively, and the pivoting of the first upper bracket 6311, second upper bracket 6312, first lower bracket 6321, and second lower bracket 6322 around their respective pivot points, the lifting and lowering of the bracket mechanism 6300 can be achieved, that is, the lifting and lowering of the upper frame 6100 and the supporting platform 6800 set on the upper frame 6100. Therefore, the user can adjust the height of the supporting platform 6800 as needed. Furthermore, in this case, only one of the first X-type bracket and the second X-type bracket needs to be set to achieve the function of the frame.

[0276] Referring to Figure 54, the lower frame 6200 includes two parallel lower longitudinal bars 6210, namely, the first lower longitudinal bar 6210a and the second lower longitudinal bar 6210b. Both the first lower longitudinal bar 6210a and the second lower longitudinal bar 6210b extend along the longitudinal direction (i.e., the front-to-back direction) of the lower frame 6200. The front ends of the two support rods of the second lower support 6322 are pivotally connected to the two lower longitudinal rods 6210 via the first pivot 6220. Specifically, the third lower support rod 6322a is pivotally connected to the first lower longitudinal rod 6210a via the first pivot 6220, and the fourth lower support rod 6322b is pivotally connected to the second lower longitudinal rod 6210b via the first pivot 6220. Each lower longitudinal rod has a sleeve 6230 fitted at its rear. Specifically, the first lower longitudinal rod 6210a has a first sleeve 6230a fitted at its rear, and the second lower longitudinal rod 6210b has a second sleeve 6230b fitted at its rear. The first sleeve 6230a and the second sleeve 6230b are slidable relative to the first lower longitudinal rod 6210a and the second lower longitudinal rod 6210b, respectively. The first lower longitudinal rod 6210a has a first guide groove 6211a extending along its length, and the second lower longitudinal rod 6210b has a second guide groove 6211b extending along its length. A portion of the first sleeve 6230a is accommodated in the first guide groove 6211a, such that the first sleeve 6230a is slidable relative to the first lower longitudinal rod 6210a along the first guide groove 6211a. A portion of the second sleeve 6230b is accommodated in the second guide groove 6211b, such that the second sleeve 6230b is slidable relative to the second lower longitudinal rod 6210b along the second guide groove 6211b. The rear ends of the two support rods of the first lower support 6321 are pivotally connected to the two sleeves 6230 via the second pivot 6240. Specifically, the first lower support rod 6321a is pivotally connected to the first sleeve 6230a via the second pivot 6240, and the second lower support rod 6321b is pivotally connected to the second sleeve 6230b via the second pivot 6240. Thus, through the sliding engagement of the first sleeve 6230a and the second sleeve 6230b with the second lower longitudinal rod 6210b and the second lower longitudinal rod 6210b respectively, the first lower support 6321 is allowed to pivot relative to the second lower support 6322.

[0277] As described above, in this embodiment, the front end of the first upper bracket 6311 is pivotally connected to the upper frame 6100, and the rear end of the second upper bracket 6312 is slidably and rotatably connected to the upper frame 6100 relative to it. The pivoting of the first upper bracket 6311 and the second upper bracket 6312 relative to each other is allowed by the displacement of the rear end of the second upper bracket 6312 relative to the upper frame 6100. The displacement of the rear end of the second upper bracket 6312 relative to the upper frame 6100 is achieved through a sliding or threaded engagement between the lifting adjustment member 6400 and the limiting rod 6600, which will be described in detail below.

[0278] Referring to Figures 55A, 55B, and 56, the upper frame 6100 includes two parallel upper longitudinal bars 6120, each extending along the longitudinal direction (i.e., the front-to-back direction) of the upper frame 6100. The upper frame 6100 also includes a generally rectangular upper frame outer frame 6110, within which the two upper longitudinal bars 6120 are located. Specifically, the centerline between the two upper longitudinal bars 6120 is approximately located at the center of the upper frame outer frame 6110 in the transverse direction (i.e., the left-to-right direction). One or more transverse bars 6130 are provided between the upper longitudinal bars 6120 and the upper frame outer frame 6110, serving as reinforcements to improve the structural strength of the upper frame 6100. A first fixing seat 6140 is installed below the front part of the two upper longitudinal rods 6120. The front end of the first upper bracket 6311 is pivotally connected to the first fixing seat 6140. Specifically, the first upper support rod 6311a and the second upper support rod 6311b of the first upper bracket 6311 are rotatably connected to the first fixing seat 6140 via a pivot. A second fixing seat 6150 and a third fixing seat 6160 are installed below the rear part of the two upper longitudinal rods 6120. In this case, the second fixing seat 6150 and the third fixing seat 6160 are welded and fixed to the two upper longitudinal rods 6120, but this is not a limitation. Other fasteners such as screws and pins can also be used for fixing. A limiting rod 6600 is rotatably disposed in the second fixing seat 6150 and the third fixing seat 6160. The limiting rod 6600 extends along the longitudinal direction (i.e., the front-to-back direction) of the upper frame 6100, meaning that the axis XI of the limiting rod 6600 is parallel to the longitudinal direction of the upper frame 6100, and the limiting rod 6600 is rotatable about the axis XI. The lifting adjustment member 6400 is sleeved on the limiting rod 6600 and is movable relative to the limiting rod 6600 along the axis XI of the limiting rod 6600. The lifting adjustment member 6400 can achieve linear movement along the axial direction (i.e., the direction of axis XI) of the limiting rod 6600 through either a sliding fit or a threaded fit with the limiting rod 6600. Specifically, the lifting adjustment member 6400 can switch between a locked state and an unlocked state. When the lifting adjustment component 6400 is in the locked state, the lifting adjustment component 6400 and the limiting rod 6600 are in threaded engagement. The sliding of the lifting adjustment component 6400 relative to the limiting rod 6600 in the axial direction is restricted, but the lifting adjustment component 6400 can be moved in the axial direction of the limiting rod 6600 by rotating the limiting rod 6600.When the lifting adjustment member 6400 is in the unlocked state, it is allowed to slide relative to the limiting rod 6600 in the axial direction. The rear end of the second upper bracket 6312 is pivotally connected to the lifting adjustment member 6400. Specifically, the first upper support rod 6311a and the second upper support rod 6311b of the second upper bracket 6312 are rotatably connected to the lifting adjustment member 6400 via pivots. Through the sliding or threaded engagement between the lifting adjustment member 6400 and the limiting rod 6600, the rear end of the second upper bracket 6312 can be displaced relative to the upper frame 6100, thereby allowing or driving the first upper bracket 6311 and the second upper bracket 6312 to pivot relative to each other to adjust the height of the frame 6000. For example, in Figure 55A, the lifting adjustment member 6400 is in a first position, where the front end of the lifting adjustment member 6400 is close to the second fixed seat 6150; in Figure 55B, the lifting adjustment member 6400 is in a second position, closer to the rear end of the upper frame 6100, where the rear end of the lifting adjustment member 6400 is close to the third fixed seat 6160. In these two cases, the frame 6000 has different heights. Specifically, in the case shown in Figure 55A, the distance between the front end of the first upper bracket 6311 and the rear end of the second upper bracket 6312 is smaller than the distance between the front end of the first upper bracket 6311 and the rear end of the second upper bracket 6312 in the case shown in Figure 55B. Therefore, when the lifting adjustment member 6400 is in the first position, the height of the frame 6000 is higher than when the lifting adjustment member 6400 is in the second position. In this embodiment, when the lifting adjustment member 6400 is in the first position, the frame 6000 is at the first height h1 shown in Figure 52A, and when the lifting adjustment member 6400 is in the second position, the frame 6000 is at the second height h2 shown in Figure 52B.

[0279] The frame 6000 also includes a height adjustment release member 6500, which is disposed on the outer wall of one side of the upper frame outer frame 6110. In this embodiment, two height adjustment release members 6500 are provided, which are respectively located on opposite sides (i.e., the left and right sides) of the outer wall of the upper frame outer frame 6110. It is understood that in other embodiments, only one height adjustment release member 6500 may be provided, which is configured to be operable to switch the height adjustment member 6400 from the locked state to the unlocked state.

[0280] The frame 6000 also includes a first traction member 6510. A first end of the first traction member 6510 is connected to a lifting adjustment release member 6500, and a second end is connected to a lifting adjustment member 6400. When the lifting adjustment release member 6500 is operated, the first traction member 6510 drives the lifting adjustment member 6400 to switch from a locked state to an unlocked state. When the lifting adjustment release member 6500 is not operated, the lifting adjustment member 6400 automatically switches from an unlocked state to a locked state. In this embodiment, a lifting adjustment release member 6500 is provided on each of the left and right sides of the upper frame 6100. Each lifting adjustment release member 6500 is connected to the lifting adjustment member 6400 via a first traction member 6510, so as to operably switch the lifting adjustment member 6400 from a locked state to an unlocked state. In other embodiments, only one lifting adjustment release element 6500 may be provided, and the lifting adjustment release element 6500 may also be provided on the front or rear side of the upper frame 6100. For user convenience, four lifting adjustment release elements 6500 may also be provided, located on the front and rear sides and the left and right sides of the upper frame 6100, respectively.

[0281] Referring to Figures 57A and 57B, the lifting adjustment release member 6500 includes a first mounting base 6520 and a lifting adjustment release button 6530 slidably disposed within the first mounting base 6520. First guide grooves 6521 are provided on opposite sides of the first mounting base 6520, extending in a direction substantially perpendicular to the sliding direction of the lifting adjustment release button 6530. First drive grooves 6531 are provided on opposite sides of the lifting adjustment release button 6530. The first end of the first traction member 6510 is connected to a fixing pin (not shown in the figures) within the lifting adjustment release button 6530. The two ends of the fixing pin protrude from the two first drive grooves 6531 located on opposite sides of the lifting adjustment release button 6530 and are slidably embedded in the two first guide grooves 6521 located on opposite sides of the first mounting base 6520. When the lifting adjustment release button 6530 is pressed to move it, the fixing pin connected to the first end of the first traction member 6510 will move in the direction that pulls the first traction member 6510, driven by the first drive groove 6531. When the pressing of the lifting adjustment release button 6530 is released, the lifting adjustment release button 6530 can return to its initial position under the action of, for example, the elastic restoring force of the elastic member (not shown).

[0282] Referring to Figures 58, 59A, and 59B, the limiting rod 6600 includes a screw 6610, the outer peripheral wall of which is threaded. The screw 6610 is rotatably disposed between the second fixed seat 6150 and the third fixed seat 6160. Specifically, the second fixed seat 6150 and the third fixed seat 6160 are respectively provided with through holes, and the first end and the second end of the screw 6610 pass through the through holes of the second fixed seat 6150 and the third fixed seat 6160, respectively. The first end and the second end of the screw 6610 are respectively fitted with screw sleeves 6620, one screw sleeve 6620 being located between the first end of the screw 6610 and the through hole of the second fixed seat 6150, and the other screw sleeve 6620 being located between the second end of the screw 6610 and the through hole of the third fixed seat 6160. The screw sleeve 6620 allows the screw 6610 to rotate more smoothly relative to the second fixed seat 6150 and the third fixed seat 6160.

[0283] The limiting rod 6600 includes an extension rod 6630 extending from the second end of the screw 6610. An operating handle 6700 is connected to the extension rod 6630 via an operating handle connector 6710. Specifically, the operating handle 6700 is located below the rear end of the upper frame 6100. The operating handle 6700 is rotatably connected to the first end of the operating handle connector 6710, and the second end of the operating handle connector 6710 is fixedly connected to the extension rod 6630. In this embodiment, the second end of the operating handle connector 6710 is sleeved on the extension rod 6630, and the second end of the operating handle connector 6710 is fixed to the extension rod 6630 by a tight fit or interference fit. In other embodiments, the second end of the operating handle connector 6710 can also be fixed to the extension rod 6630 by fasteners such as screws, bolts, and pins. Under the operation of the user, the operating handle 6700 can rotate around the axis X1 of the limiting rod 6600, and while the operating handle 6700 rotates around the axis X1 of the limiting rod 6600, the operating handle 6700 can also rotate around its own axis X2. During the rotation of the operating handle 6700 around the axis XI of the limiting rod 6600, the operating handle connector 6710 will rotate with the rotation of the operating handle 6700, and under the drive of the operating handle connector 6710, the limiting rod 6600 will rotate synchronously with the operating handle connector 6710 around its axis XI.

[0284] An extension rod 6630 has a rod cap 6640 at its end away from the screw 6610. The rod cap 6640 has a radially protruding portion with a diameter larger than that of the extension rod 6630. The rod cap 6640 prevents the operating handle 6700 from dislodging from the extension rod 6630 and falling off. In this embodiment, the rod cap 6640 is in the form of a screw, with the screw shank threaded to the end of the extension rod 6630 away from the screw 6610, and the screw head protruding radially outward relative to the extension rod 6630. It is understood that in other embodiments, the rod cap 6640 can be any suitable element, as long as it prevents the operating handle 6700 from dislodging from the extension rod 6630.

[0285] The lifting adjustment member 6400 includes a sliding sleeve 6410 and a sliding locking member 6420 movably disposed within the sliding sleeve 6410. A third rotating shaft 6470 is respectively disposed on opposite sides of the sliding sleeve 6410. The rear end of the second upper bracket 6312 is rotatably connected to the third rotating shaft 6470. Specifically, the rear ends of the first upper support rod 6311a and the second upper support rod 6311b are respectively rotatably connected to the third rotating shaft 6470. The sliding sleeve 6410 is fitted onto the limiting rod 6600 and is slidable along a portion of the limiting rod 6600. Specifically, the sliding sleeve 6410 is slidable between the second fixed seat 6150 and the third fixed seat 6160 along the screw 6610 of the limiting rod 6600. The sliding locking member 6420 is configured to be movable between an engaged position engaged with the screw 6610 and a disengaged position disengaged from the screw 6610. Figure 59A shows the sliding lock 6420 engaged with the screw 6610, and Figure 59B shows the sliding lock 6420 disengaged from the screw 6610. When the sliding lock 6420 is engaged with the screw 6610, the lifting adjustment member 6400 is locked, preventing the sliding sleeve 6410 from sliding relative to the screw 6610, and correspondingly, preventing the lifting adjustment member 6400 from sliding relative to the limit rod 6600. When the sliding lock 6420 is disengaged from the screw 6610, the lifting adjustment member 6400 is unlocked, allowing the sliding sleeve 6410 to slide relative to the screw 6610, and correspondingly, allowing the lifting adjustment member 6400 to slide relative to the limit rod 6600. In this case, the sliding of the lifting adjustment member 6400 relative to the limit rod 6600 allows the first upper bracket 6311 and the second upper bracket 6312 to pivot relative to each other, thereby enabling the adjustment of the lifting of the frame 6000.

[0286] The top of the sliding locking member 6420 is provided with multiple engaging teeth. When the sliding locking member 6420 is in the engaged position, these engaging teeth engage with the threads of the screw 6610, thereby restricting the sliding of the sleeve 6410 relative to the screw 6610. The engaging teeth of the sliding locking member 6420 can selectively engage with the threads at specific locations in the axial direction of the screw 6610 to define the axial position of the sleeve 6410 in the screw 6610, thereby enabling the frame 6000 to be locked at different heights. For example, when the front end of the sleeve 6410 is close to the second fixing seat 6150, the engaging teeth of the sliding locking member 6420 are adapted to engage with the threads of the screw 6610 near the second fixing seat 6150 to lock the frame 6000 at the first height h1 shown in FIG. 52A. When the rear end of the sliding sleeve 6410 is close to the third fixed seat 6160, the engaging teeth of the sliding locking member 6420 are adapted to engage with the thread of the screw 6610 near the third fixed seat 6160 to lock the frame 6000 at the second height h2 shown in FIG52B.

[0287] The lifting adjustment member 6400 also includes a first drive member 6430 and a second drive member 6440 movably disposed in the sliding sleeve 6410. The first drive member 6430 is movable relative to the sliding sleeve 6410 in the front-back direction, and the second end of the first traction member 6510 is connected to the first drive member 6430. The second drive member 6440 is movable relative to the sliding sleeve 6410 in the vertical direction. A sliding locking member 6420 is fixed to the top of the second drive member 6440. In this embodiment, the sliding locking member 6420 is fixedly connected to the second drive member 6440 by a threaded fastener. In other embodiments, the sliding locking member 6420 can be fixed to the second drive member 6440 by a permanent connection method such as welding or bonding, or by a fastener such as a pin fastener or a pin-type fastener, or it can be integrally formed with the second drive member 6440. The second driving member 6440 is connected to the first driving member 6430 via a first fixing pin 6450. Second driving grooves 6431 are provided on opposite sides of the first driving member 6430. The first fixing pin 6450 passes through the second driving member 6440, and its two ends are slidably connected to the second driving grooves 6431 on opposite sides of the first driving member 6430. A first elastic member 6460 is provided between the first driving member 6430 and the sliding sleeve 6410. In this embodiment, the first elastic member 6460 is a helical compression spring. In other embodiments, the first elastic member 6460 can be a wave spring, torsion spring, or any other suitable type of spring. Similarly, other elastic members mentioned below can also be helical compression springs, wave springs, torsion springs, or any other suitable type of spring, which will not be elaborated further.

[0288] The second end of the first traction member 6510 passes through the sliding sleeve 6410 and connects to the first driving member 6430. As described above, when the lifting adjustment release button 6530 is pressed, the first traction member 6510 is pulled, and the second end of the first traction member 6510 moves forward, thereby driving the first driving member 6430 to move forward, and the first elastic member 6460 is compressed. At this time, driven by the second driving groove 6431, the second driving member 6440 moves downward with the first fixing pin 6450, and the sliding locking member 6420 fixed to the second driving member 6440 also moves downward, causing the sliding locking member 6420 to disengage from the screw 6610. The sliding locking member 6420 is in the disengaged position shown in FIG. 59B. When the pressing of the lifting adjustment release button 6530 is released, the first traction member 6510 no longer applies tension to the first driving member 6430. Under the elastic restoring force of the first elastic member 6460, the first driving member 6430 moves backward. At this time, driven by the second driving groove 6431, the second driving member 6440 moves upward with the first fixing pin 6450, and the sliding locking member 6420 fixed to the second driving member 6440 also moves upward, so that the sliding locking member 6420 engages with the screw 6610. The sliding locking member 6420 is in the engaged position shown in FIG. 59A. It is understood that the structure and operation of the lifting adjustment release member 6500 and the lifting adjustment member 6400 described above are merely illustrative examples, and this disclosure is not limited thereto. Those skilled in the art can use any other suitable method to realize the control of the lifting adjustment release member 6500 on the lifting adjustment member 6400.

[0289] According to the handcart 600 of this aspect, through the sliding or threaded engagement of the lifting adjustment member 6400 and the limiting rod 6600, the rear end of the second upper bracket 6312 can be displaced relative to the upper frame 6100, thereby allowing or driving the first upper bracket 6311 and the second upper bracket 6312 to pivot relative to each other to adjust the height of the frame 6000. For example, when the user wants to adjust the height of the frame 6000, by operating the lifting adjustment release member 6500, the lifting adjustment member 6400 can be switched from the locked state to the unlocked state, so that the rear end of the second upper bracket 6312 can slide relative to the upper frame 6100, thereby allowing the frame 6000 to be easily adjusted to the desired height by raising or lowering the upper frame 6100. Furthermore, even when the lifting adjustment member 6400 is locked, the user can still change the height of the frame 6000 by operating the operating handle 6700, causing the rear end of the second upper bracket 6312 to move relative to the upper frame 6100. For example, when the user rotates the operating handle 6700 about the axis XI of the limiting rod 6600, the limiting rod 6600 will rotate synchronously with the operating handle 6700. In the unlocked state of the lifting adjustment member 6400, the sliding locking member 6420 of the lifting adjustment member 6400 engages with the screw 6610 of the limiting rod 6600, and there is a threaded engagement between the sliding locking member 6420 and the screw 6610. Through the threaded engagement between the sliding locking member 6420 and the screw 6610, the rotation of the limiting rod 6600 will cause the lifting adjustment member 6400 to move linearly along the axial direction of the limiting rod 6600. The rotation of the limit rod 6600 in different directions (e.g., clockwise or counterclockwise) will cause the lifting adjustment component 6400 to move forward or backward, thereby raising or lowering the height of the frame 6000 accordingly.

[0290] Figure 60 illustrates a handcart 600 according to another embodiment of the present disclosure, differing from the embodiment shown in Figure 50 in the arrangement of the handle 6900. In this embodiment, the handle 6900 is connected to the bottom of the lower frame 6200, rather than the upper frame 6100. Furthermore, in the embodiment shown in Figure 50, the handle 6900 is located at the rear end of the upper frame 6100, while in this embodiment, the handle 6900 is located at the front end of the lower frame 6200. According to the handle 6900 arrangement of this embodiment, the user can easily move the handcart 600 forward by pulling it.

[0291] Those skilled in the art will understand that, although in the embodiments described above, the front end of the first upper bracket 6311 is pivotally connected to the front of the upper frame 6100, and the rear end of the second upper bracket 6312 is slidably and rotatably connected to the rear of the upper frame 6100 relative to the upper frame 6100, depending on the actual application, the front end of the first upper bracket 6311 can also be slidably and rotatably connected to the front of the upper frame 6100 relative to the upper frame 6100, and the rear end of the second upper bracket 6312 can be pivotally connected to the rear of the upper frame 6100. In this case, the operating handle 6700 is located below the front end of the upper frame 6100.

[0292] Another aspect of this disclosure provides a trolley having an engaging device for engaging a portable vehicle.

[0293] Returning to Figure 50, as previously described, the trolley 600 includes a frame 6000 and a support platform 6800 disposed on top of the frame 6000 (i.e., the upper frame 6100), the support platform 6800 being adapted to carry a portable vehicle. The trolley 600 also includes a locking device 7000 disposed on the upper frame 6100, the top of the locking device 7000 extending from the support platform 6800. When the portable vehicle is carried on the support platform 6800, the locking device 7000 is used to secure the portable vehicle.

[0294] Figure 61 shows a stroller 600 loaded with a portable carrier 700. In this embodiment, the portable carrier 700 is in the form of a pet carrier. In other embodiments, the portable carrier 700 may be a baby carrier, baby sleeping box, pet sleeping box, or other carrier for carrying an infant or pet. In Figure 61, only the frame of the portable carrier 700 is shown at the top, without showing the fabric that may cover the frame.

[0295] Referring to Figure 62, a latch 710 is provided at the bottom of the portable carrier 700. When the portable carrier 700 is supported on the support platform 6800, the latching device 7000 is adapted to latch the latch 710 to secure the portable carrier 700-trolley 600. It also includes a latching release member 7100, which can be operated to release the latching device 7000 from the latch 710 of the portable carrier 700. Both the engaging device 7000 and the engaging / unengaging element 7100 are disposed on the upper frame 6100 of the vehicle frame 6000. Referring to Figure 63, the engaging device 7000 includes an engaging device housing 7080, and an engaging locking element 7010 and an unlocking retainer 7020, which are at least partially disposed in the engaging device housing 7080. The top ends of the engaging locking element 7010 and the unlocking retainer 7020 are adapted to extend from the engaging device housing 7080. The engaging locking element 7010 is movable between a locked position and an unlocked position. When the locking member 7010 is in the locked position, it is adapted to secure the portable carrier 700 supported on the support platform 6800. When the locking member 7010 is in the unlocked position, it is adapted to release the securement of the portable carrier 700, allowing the portable carrier 700 to be removed from the support platform 6800. The release retainer 7020 is movable between an extended position and a retracted position. When the portable carrier 700 is supported on the support platform 6800, the release retainer 7020 is in the retracted position. When the portable carrier 700 is removed from the support platform 6800, the release retainer 7020 moves from the retracted position to the extended position. When the release retainer 7020 is pressed down into the retracted position, it allows the locking member 7010 to move from the locked position to the unlocked position and then restricts its movement from the unlocked position to the locked position. When the force is removed, the release retainer 7020 moves from the retracted position to the extended position, allowing the locking member 7010 to move from the release position to the locking position.

[0296] Referring to Figures 64A and 64B, the locking / unlocking member 7100 is disposed on the outer wall of one side of the upper frame outer frame 6110. In this embodiment, two locking / unlocking members 7100 are provided, which are located on opposite sides (i.e., the left and right sides) of the outer wall of the upper frame outer frame 6110. The trolley 600 also includes a second traction member 7110, the first end of which is connected to the locking / unlocking member 7100, and the second end of which is connected to the locking device 7000. In this embodiment, one locking / unlocking member 7100 is provided on each of the left and right sides of the upper frame 6100, and each locking / unlocking member 7100 is connected to the locking device 7000 through a second traction member 7110, so as to operably switch the locking member 7010 from the locked position to the unlocked position. In other embodiments, only one locking / unlocking element 7100 may be provided, and the locking / unlocking element 7100 may also be provided on the front or rear side of the upper frame 6100. For ease of operation by the user, four locking / unlocking elements 7100 may also be provided, located on the front and rear sides and the left and right sides of the upper frame 6100, respectively.

[0297] Referring to Figures 65, 66A, and 66B, the locking / unlocking mechanism 7100 includes a second mounting base 7120 and a locking / unlocking button 7130 slidably disposed within the second mounting base 7120. Second guide grooves 7121 are provided on opposite sides of the second mounting base 7120, extending in a direction substantially perpendicular to the sliding direction of the locking / unlocking button 7130. Third drive grooves 7131 are provided on opposite sides of the locking / unlocking button 7130. A first end of a second traction member 7110 is connected to a traction member connector 7150. A second fixing pin 7140 passes through the traction member connector 7150, and both ends of the second fixing pin 7140 pass through the two second drive grooves 7131 located on opposite sides of the locking / unlocking button 7130, respectively. The two ends of the second fixing pin 7140 protrude from the two third drive grooves 7131 and are slidably embedded in the two second guide grooves 7121 located on opposite sides of the second mounting base 7120. When the locking and releasing button 7130 is pressed to move the locking and releasing button 7130 to the position shown in FIG. 66B, the second fixing pin 7140 will move backward under the drive of the third drive grooves 7131. The second fixing pin 7140 drives the traction member connector 7150 and the first end of the second traction member 7110 connected to the traction member connector 7150 to move backward, thereby pulling the second traction member 7110. When the pressing of the locking and releasing button 7130 is released, the locking and releasing button 7130 can return to the initial position shown in FIG. 66A under the action of, for example, the elastic restoring force of the elastic member (not shown).

[0298] Figures 67 and 68 show the engaging device 7000 mounted on the upper frame 6100. For ease of illustration, the upper cover of the engaging device housing 7080 is removed in Figure 67, and the upper and lower covers of the engaging device housing 7080 are removed in Figure 68. The engaging device 7000 includes a sleeve 7030 and a mounting plate 7050. Both the sleeve 7030 and the mounting plate 7050 are mounted on the upper longitudinal rods 6120 of the upper frame 6100. Specifically, the sleeve 7030 has protrusions extending laterally on both sides, and the two protrusions are respectively fixed to the two upper longitudinal rods 6120. The mounting plate 7050 is fixed to one of the upper longitudinal rods 6120. In this embodiment, the sleeve 7030 is fixed to the upper longitudinal rod 6120 by fasteners, and the mounting plate 7050 is fixed to the upper longitudinal rod 6120 by welding. In other embodiments, the sleeve 7030 may also be fixed to both upper longitudinal rods 6120 by welding, and the mounting plate 7050 may also be fixed to the upper longitudinal rod 6120 by fasteners. Referring to Figures 69, 70, 71A, and 72B, the engaging locking member 7010 has a locking hook 7011. The locking hook 7011 is adapted to engage the lever 710 located at the bottom of the portable vehicle 700. The locking member 7010 has a pivot hole 7012 through which the fourth pivot 7051 passes. The fourth pivot 7051 is fixed to the mounting plate 7050. The locking hook 7011 is pivotable about the fourth pivot 7051 to engage or disengage the locking hook 7011 from the latch 710. The second end of the second traction member 7110 is connected to the other end of the locking member 7010 opposite to the locking hook 7011. When the locking release button 7130 is pressed and the first end of the second traction member 7110 is pulled, the second end of the second traction member 7110 is adapted to pull the locking member 7010 so that the locking hook 7011 pivots from a position where it can engage with the latch 710 (i.e., the locked position of the locking member 7010) to a position where it can disengage from the latch 710 (i.e., the locked position of the locking member 7010). (The locked and unlocked positions). Figures 71A and 71B show the locking member 7010 in the locked and unlocked positions, respectively. The second end of the second traction member 7110 is connected to the locking member 7010 via a retaining pin (not shown). The locking member 7010 has a retaining hole 7013 through which the retaining pin passes. The locking device 7000 also includes an elastic element, such as a tension spring 7040, one end of which is connected to the upper longitudinal rod 6120, and the other end of which is connected to the retaining pin connected to the second end of the second traction member 7110.The tension spring 7040 is adapted to apply a tension force to the locking member 7010, enabling the locking member 7010 to automatically return from the unlocked position to the locked position. For example, when the locking member 7010 is in the disengaged position, when the tension force applied to the locking member 7010 by the second traction member 7110 is removed, the locking member 7010 can pivot from the unlocked position to the locked position under the elastic restoring force of the tension spring 7040. The locking device 7000 also includes a retaining drive member 7070 and a stop member 7060 slidable relative to the retaining drive member 7070. The locking member 7010 is provided with a stop engagement member adapted to engage with the stop member 7060. In this embodiment, the stop fitting is a locking hole 7014. The stop 7060 can be inserted into the locking hole 7014. When the stop 7060 is inserted into the locking hole 7014, the locking member 7010 cannot pivot, that is, the locking hook 7011 cannot pivot around the fourth pivot 7051. The retaining drive member 7070 is embedded in the sleeve 7030 and can slide within the sleeve 7030. The sleeve 7030 has a third guide groove 7031 on its opposite sides, and the third guide groove 7031 extends in a direction substantially perpendicular to the sliding direction of the release retaining member 7020. The release retaining member 7020 has a fourth drive inclined groove 7021 on its opposite sides. The first end of the retaining drive member 7070 is fixed with a fifth fixing pin 7071. The fifth fixing pin 7071 passes through the first end of the retaining drive member 7070, and its two ends pass through two third guide grooves 7031 located on opposite sides of the sleeve 7030. After exiting the two third guide grooves 7031, the two ends of the fifth fixing pin 7071 are slidably embedded in two fourth drive grooves 7021 located on opposite sides of the release retainer 7020. A second elastic member 7062 is provided between the second end of the retaining drive member 7070 and the sleeve 7030. When the release retainer 7020 is pressed, driven by the fourth drive grooves 7021, the fifth fixing pin 7071 moves backward, causing the retaining drive member 7070 to move backward, and the second elastic member 7062 is compressed. When the pressure on the release retainer 7020 is released, the retaining drive 7070 can move forward to its initial position under the elastic restoring force of the second elastic member 7062. The position of the retaining drive 7070 when the release retainer 7020 is pressed is referred to as the first position, and the position of the retaining drive 7070 when the release retainer 7020 is not pressed is referred to as the second position.When the drive unit 7070 is in the first position, it is closer to the engaging locking unit 7010o than when it is in the second position.

[0299] The release retainer 7020 is movable between an extended position and a retracted position. When the release retainer 7020 is in the extended position, its tip extends from the engaging device housing 7080. When the portable carrier 700 is supported on the carrying platform 6800, the release retainer 7020 is in the retracted position; when the portable carrier 700 is removed from the carrying platform 6800, the release retainer 7020 moves from the retracted position to the extended position. Specifically, when the lever 710 is placed in the engaging device 7000, the release retainer 7020 is pressed by the lever 710, moving from the extended position to the retracted position. When the release retainer 7020 is pressed down into the retracted position, it allows the engaging locking member 7010 to move from the locked position to the release position and then restricts the engaging locking member 7010 from the release position to the locked position. When the force is released, and the release retainer 7020 moves from the retracted position to the extended position, the engaging locking member 7010 is allowed to move from the released position to the locked position. Specifically, when the release retainer 7020 is in the retracted position, the engaging locking member 7010 is allowed to move from the locked position shown in FIG. 71A to the released position shown in FIG. 71B, but the engaging locking member 7010 cannot move from the released position to the locked position. Only when the lever 710 is removed from the engaging device 7000, causing the release retainer 7020 to be in the extended position, can the engaging locking member 7010 move from the released position to the locked position. With the locking member 7010 in the locked position, when the portable carrier 700 is placed on the support platform 6800, the lever 710 will push the locking member 7010 slightly, allowing it to enter the locking device 7000. The locking member 7010 then returns to the locked position under the elastic restoring force of the tension spring 7040, thus engaging the lever 710. The distance the locking member 7010 moves in the locked position due to the lever is less than the distance it moves from the locked position to the unlocked position.

[0300] Referring to Figures 72A and 72B, in Figure 72A, the lever 710 of the portable carrier 700 is positioned at the top of the release retainer 7020 and is engaged by the locking hook 7011 of the locking member 7010. The release retainer 7020 is pressed by the lever 710, holding the drive member 7070 in a first position. In Figure 72B, the release retainer 7020 is not pressed by the lever 710, holding the drive member 7070 in a second position. The second end of the drive member 7070 is provided with a receiving cavity 7072, and the first end of the stop member 7060 is slidably inserted into the receiving cavity 7072. A third elastic element 7063 is provided between the first end of the stop 7060 and the end wall of the receiving cavity 7072. The third elastic element 7063 is adapted to bias the stop 7060 toward the engaging locking element. Long slots 7073 are provided on opposite sides of the holding drive 7070, and the long slots 7073 communicate with the receiving cavity 7072. A fourth fixing pin 7061 is fixed to the first end of the stop 7060. The fourth fixing pin 7061 passes through the first end of the stop 7060, and its two ends are slidably connected to the long slots 7073 provided on opposite sides of the holding drive 7070. The long slots 7073 allow the holding drive 7070 to move from a second position to a first position while the stop 7060 remains in its original position, without interference from the fourth fixing pin 7061. In other words, even if the second end of the stop 7060 is blocked by the locking member 7010, the retaining drive member 7070 can still move from the second position to the first position.

[0301] When the lever 710 of the portable carrier 700 is placed in the engaging device 7000, the downward force exerted by the lever 710 on the release retainer 7020 overcomes the elastic force of the second elastic member 7062, causing the release retainer 7020 to move from the extended position to the retracted position, and keeping the drive member 7070 moving from the second position to the first position. Figure 73A shows that when the release retainer 7020 is pressed, the engaging locking member 7010 in the locked position—due to the abutment of the engaging locking member 7010, the stop member 7060 remains in the same position, and the third elastic member 7063 disposed between the first end of the stop member 7060 and the end wall of the receiving cavity 7072 is compressed. When the locking member 7010 pivots from the locked position to the unlocked position under the pull of the second traction member 7110, the locking hole 7014 of the locking member 7010 aligns with the second end of the stop member 7060. Under the elastic restoring force of the third elastic member 7063, the second end of the stop member 7060 moves backward and inserts into the locking hole 7014, thus engaging the stop member 7060 with the locking hole 7014. At this time, because the stop member 7060 is engaged with the locking hole 7014, the stop member 7060 prevents the pivoting of the locking member 7010. When the locking and unlocking member 7100 is released, even if the locking member 7010 is subjected to the tension of the tension spring 7040, it cannot pivot to the locked position. Therefore, the locking member 7010 remains in the unlocked position. Figure 73B shows the engaging locking member 7010 in the released position when the release retainer 7020 is pressed. When the release retainer 7020 is in the retracted position, the stop 7060 is adapted to hold the engaging locking member 7010 in the released position. When the lever 710 is removed from the engaging device 7000, the retaining drive member 7070 moves from the first position to the second position under the elastic restoring force of the second elastic member 7062. The elongated slot 7073 drives the stop 7060 forward via the fourth retaining pin 7061, causing the stop 7060 to move out of the locking hole 7014 and spaced apart from the engaging locking member 7010. At this time, since the stop 7060 disengages from the locking hole 7014, the pivoting of the locking member 7010 is no longer blocked by the stop 7060. Therefore, the locking member 7010 can pivot from the unlocked position to the locked position under the pull of the tension spring 7040.

[0302] According to the handcart 600 disclosed herein, when a user wants to remove the portable carrier 700 from the support platform 6800, by operating the locking and unlocking mechanism 7100 once, the locking and unlocking mechanism 7010 can be moved from the locked position to the unlocked position and remain in the unlocked position. Furthermore, before the lever 710 is removed from the locking device 7000, the user does not need to operate the locking and unlocking mechanism 7100, and the locking and unlocking mechanism 7010 remains in the unlocked position, thus facilitating the user's removal of the portable carrier 700 from the support platform 6800. After the portable carrier 700 is removed, the locking and unlocking mechanism 7010 will pop out again from the locking device housing 7080, releasing the locking and unlocking mechanism 700 from its unlocked state.

[0303] It is understood that the locking device structure proposed in this aspect can be applied to the handcart proposed in any aspect of this disclosure.

[0304] Another aspect of this disclosure provides a trolley with an engaging device for engaging a portable vehicle. The main difference between the trolley in this aspect and the trolley 600 described in the above embodiments is that the trolley in this aspect does not have an upper frame and a height-adjustable support mechanism; instead, the carrying platform for the portable vehicle is located on the lower frame. The following will primarily describe the differences between the trolley in this aspect and the trolley 600 described in the above embodiments; similarities will not be repeated.

[0305] Referring to Figures 74 to 76, the handcart 800 includes a lower frame 8100 and a handlebar 8200, the handlebar 8200 being pivotally connected to the front end of the lower frame 8100. A support platform 8700 for supporting a portable carrier 700 is provided on the top of the lower frame 8100. A locking device 8400 is also provided on the top of the lower frame 8100. When the portable carrier, such as the previously described portable carrier 700, is supported on the support platform 8700, the locking device 8400 is used to secure the portable carrier. The locking device 8400 has the same construction as the locking device 7000 described in the above embodiments. The locking device 8400 is connected to the locking release device 8500 via the traction member 8510. Similar to the locking release device 7100 described in the above embodiments, the locking release device 8500 can be operated to release the locking device 8400 from the locking lever 710 of the portable vehicle, such as the portable vehicle 700 described above.

[0306] In this embodiment, the trolley 800 also has a symmetrical structure. The following description will focus on one side of the trolley 800; the other side has the same structure and will not be repeated. The handle 8200 includes an upper support rod 8210 and a lower support rod 8220. The first end of the lower support rod 8220 is pivotally connected to the front end of the lower frame 8100, and the second end of the lower support rod 8220 is pivotally connected to the upper support rod 8210. The upper support rod 8210 and the lower support rod 8220 are pivotable relative to each other, allowing the handle 8200 to be folded during the folding and closing of the trolley 800. A locking / unlocking mechanism 8500 is located at the pivot point between the upper support rod 8210 and the lower support rod 8220. Specifically, the locking and releasing member 8500 is fixed to the second end of the lower support rod 8220. When the rider 8200 is in the extended state, the locking and releasing member 8500 is generally aligned with the pivot point between the upper support rod 8210 and the lower support rod 8220. During the transition of the rider 8200 from the extended state to the folded state, the locking and releasing member 8500 moves with the lower support rod 8220. A support member 8300 connects the locking and releasing member 8500 to the lower frame. During the transition of the rider 8200 from the extended state to the folded state, the support member 8300 is also folded down.

[0307] Referring to Figures 77 to 79, the lower frame 8100 includes two longitudinal rods 8110, and a locking device 8400 is mounted on these two longitudinal rods 8110. When the support platform 8700 is mounted on the lower frame 8100, the top of the locking device 8400 is adapted to protrude through the support platform 8700. A first end of the traction member 8510 is connected to the locking release member 8500, and a second end of the traction member 8510 is connected to the locking device 8400. The locking release member 8500 includes a locking release member housing 8520 and a locking release button 8530 slidably disposed within the locking release member housing 8520. The locking release member housing 8520 is fixed to the second end of the lower support rod 8220. The locking and releasing mechanism housing 8520 has guide grooves 8521 on opposite sides, extending in a direction substantially perpendicular to the sliding direction of the locking and releasing button 8530. The locking and releasing button 8530 also has drive grooves 8531 on opposite sides. The first end of the traction member 8510 is connected to a fixing pin 8540 within the locking and releasing button 8530. The two ends of the fixing pin 8540 extend from the two drive grooves 8531 on opposite sides of the locking and releasing button 8530 and are slidably embedded in the two guide grooves 8521 on opposite sides of the locking and releasing mechanism housing 8520. When the locking and releasing button 8530 is pressed to move it, the fixing pin 8540 connected to the first end of the traction member 8510 moves backward under the drive of the guide grooves 8521, thereby pulling the traction member 8510. When the press of the locking / unlocking button 8530 is released, the locking / unlocking button 8530 can return to its initial position under the elastic restoring force of, for example, an elastic element (not shown). The method of releasing the locking device 8400 by operating the locking / unlocking member 8500 is the same as the method of releasing the locking device 7000 by operating the locking / unlocking member 7100 described in the above embodiments, and will not be repeated here.

[0308] The support member 8300 includes a first rod 8310, a second rod 8320, a third rod 8330, and an intermediate connector 8340 connected in sequence. The first end of the third rod 8330 is pivotally connected to the lower frame 8100, and the second end of the third rod 8330 is pivotally connected to the first end of the intermediate connector 8340. The first end of the second rod 8320 is pivotally connected to the second end of the intermediate connector 8340, and the second end of the second rod 8320 is pivotally connected to the first end of the first rod 8310. The second end of the first rod 8310 is pivotally connected to the locking and unlocking housing 8520. The first rod 8310 also has an intermediate pivot point 8311 between its first and second ends, pivotally connected to the lower support rod 8220. When the rider 8200 is in the extended state (as shown in Figures 74, 75, and 77 to 79), the first link 8310 and the second link 8320 are generally collinear and extend generally vertically. When the rider 8200 is folded (as shown in Figure 80), the first link 8310 pivots about the central pivot point 8311 relative to the lower support link 8220, and the first link 8310 pivots relative to the second link 8320, causing the second end of the first link 8310 to move toward the first end of the second link 8320. The pivotal connections between the components of the support member 8300, as well as the pivotal connections between the support member 8300, the rider 8200, and the lower frame 8100, allow the support member 8300 to fold as the rider 8200 folds during the folding of the trolley 800, and to extend as the rider 8200 extends during the unfolding of the trolley 800.

[0309] Referring to Figures 79 and 80, in this embodiment, an anti-pinch member 8600 is provided on the locking and releasing member 8500. The anti-pinch member 8600 is pivotally connected to the locking and releasing member housing 8520, and at least a portion of the anti-pinch member 8600 extends out of the locking and releasing member housing 8520. The anti-pinch member 8600 is pivotable relative to the locking and releasing member housing 8520 about a fifth pivot axis 8610 to increase or decrease the portion of the anti-pinch member 8600 extending out of the locking and releasing member housing 8520. A torsion spring 8620 is provided at the fifth pivot 8610. The torsion spring 8620 is oriented in a pivot direction that causes the anti-pinch member 8600 to extend from the locking and releasing housing 8520. During the folding and closing of the trolley 800, the second end of the lower support rod 8220 and the first rod 8310 move closer to each other, and the locking and releasing housing 8520 and the first rod 8310, which are fixed to the second end of the lower support rod 8220, also move closer to each other. The anti-pinch member 8600 is provided to prevent, for example, a user's finger from being pinched by the close proximity of the locking and releasing housing 8520 and the first rod 8310. When the trolley 800 is folded up until the anti-pinch member 8600 contacts the lower frame 8100, the pushing force of the lower frame 8100 on the anti-pinch member 8600 overcomes the elastic force of the torsion spring 8620, causing the anti-pinch member 8600 to pivot along the pivot direction of the retracted locking and releasing housing 8520. This prevents interference between the anti-pinch member 8600 and the lower frame 8100, thereby reducing the volume of the trolley 800 when folded. When the trolley 800 is unfolded, under the elastic restoring force of the torsion spring 8620, the anti-pinch member 8600 pivots along the pivot direction of the extended locking and releasing housing 8520 to return to the initial position shown in Figure 79.

[0310] Figures 81 and 82 illustrate a handcart according to another embodiment of the above aspects. The main difference between the handcart in this embodiment and the handcart in the above embodiments lies in the structure and location of the locking and unlocking mechanism. The following will mainly describe the differences between the handcart in this embodiment and the handcart in the above embodiments; similarities will not be repeated.

[0311] Referring to Figures 81 and 82, in this embodiment, the trolley 800 includes a locking / unlocking member 8800. Similar to the locking / unlocking member 8500 described in the previous embodiments, the locking / unlocking member 8800 is operable to release the locking device 8400 from the latch 710 of the portable vehicle, such as the previously described portable vehicle 700. The difference from the previous embodiments is that the locking / unlocking member 8500 is located on the side of the lower frame 8100. It is understood that although in the illustrated embodiment the locking / unlocking member 8800 is located on the left side of the lower frame 8100, in other embodiments the locking / unlocking member 8800 may be located on the right side, or on the front or rear side of the lower frame 8100. Furthermore, it is understood that although only one locking and unlocking element 8800 is provided in the illustrated embodiment, in other embodiments, two or more locking and unlocking elements 8800 may be provided, which are respectively provided on different sides of the lower frame 8100.

[0312] In this embodiment, the lower frame 8100 has two outer rods 8120 located on opposite sides – the outer rods 8120 generally extend along the front-rear direction of the trolley 800. A locking / unlocking element 8800 is located on one side of one of the outer rods 8120 for user operation. Specifically, the locking / unlocking element 8800 is located on the left outer rod 8120 – the user can release the locking device 8400 by operating the locking / unlocking element 8500. The locking / unlocking element 8500 is connected to the locking device 8400 via the traction element 8810. In Figures 81 and 82, only the two ends of the traction element 8810 connected to the locking / unlocking element 8500 and the locking device 8400 are shown, while the middle part of the traction element 8810 is omitted. The middle part of the traction element 8810 can be arranged along any suitable path on the lower frame 8100, as long as the locking / unlocking element 8500 can drive the locking device 8400 via the traction element 8810.

[0313] The locking / releasing mechanism 8800 includes a locking / releasing button 8820 slidably disposed on the outer rod 8120. The locking / releasing button 8820 is connected to one end of the traction member 8810 via a mounting block 8830, and the other end of the traction member 8810 is connected to the locking device 8400. The mounting block 8830 is used to fix the end of the traction member 8810 connected to the locking / releasing mechanism 8800. The locking / releasing button 8820 includes an operating part 8821 and a connecting part 8822. The operating part 8821 can be operated by a user to pull the locking / releasing button 8820, and the connecting part 8822 is connected to the mounting block 8830. When the locking / releasing button 8820 is pulled to move it outward, the mounting block 8830 connected to one end of the traction member 8810 will move synchronously, thereby pulling the traction member 8810. When the pull of the locking and unlocking button 8820 is released, the locking and unlocking button 8820 can return to its initial position under the elastic restoring force of, for example, an elastic element (not shown). The method of releasing the locking device 8400 by operating the locking and unlocking member 8800 is the same as the method of releasing the locking device 7000 by operating the locking and unlocking member 7100 described in the above embodiment, and will not be repeated here.

[0314] It is understood that the locking and unlocking mechanism structure and its placement proposed in this aspect can be applied to the handcarts proposed in any aspect of this disclosure. Another aspect of this disclosure provides a handcart with a locking device for locking a portable vehicle. The main difference between the handcart in this aspect and the handcarts described in the above embodiments lies in the structure of the locking device and the locking and unlocking mechanism. The following will mainly describe the differences between the handcart in this embodiment and the handcarts in the above embodiments; similarities will not be repeated.

[0315] Referring to Figures 83 and 84, the trolley 900 includes a lower frame 9100 and a handlebar 9200, the handlebar 9200 being pivotally connected to the front end of the lower frame 9100. The top of the lower frame 9100 is provided with a support platform (not shown) for carrying a portable vehicle. The lower frame 9100 is provided with an engaging device 9300 and an engaging-releasing element 9400 – the engaging device 9300 secures the portable vehicle, such as the previously described portable vehicle 700, when placed on the lower frame 9100 ± (i.e., carried on the support platform). The engaging-releasing element 9400 is operable to release the engaging device 9300 from engaging the lever 710 of the portable vehicle, such as the previously described portable vehicle 700. In this embodiment, the engaging-releasing element 9400 is located on the side of the lower frame 9100. It is understood that, although in the illustrated embodiment the locking / unlocking member 9400 is located on the left side of the lower frame 9100, in other embodiments the locking / unlocking member 9400 may be located on the right side, front side, or rear side of the lower frame 9100. Furthermore, it is understood that, although only one locking / unlocking member 9400 is provided in the illustrated embodiment, in other embodiments two or more locking / unlocking members 9400 may be provided, and these locking / unlocking members 9400 may be located on different sides of the lower frame 9100.

[0316] In this embodiment, the lower frame 9100 has two outer rods 9120 located on opposite sides – the outer rods 9120 generally extend along the front-rear direction of the trolley 900. A locking / unlocking mechanism 9400 is provided on the outward-facing side of one of the outer rods 9120 for user operation. Specifically, the locking / unlocking mechanism 9400 is located on the left outer rod 9120. The user can unlock the locking / unlocking device 9300 by operating the locking / unlocking mechanism 9400. Referring to FIG. 85, the locking / unlocking mechanism 9400 is connected to the locking / unlocking device 9300 via a traction member 9410, which is shown in FIG. 85 at one end connected to the locking / unlocking mechanism 9400, and the other end connected to the locking / unlocking device 9300 (see FIG. 89). It is understood that the traction component 9410 can be arranged along any suitable path between the locking / unlocking component 9400 and the locking device 9300, which will not be elaborated here.

[0317] Referring to Figures 85 and 86, the locking and unlocking mechanism 9400 includes a locking and unlocking push button 9420 slidably disposed on the outer rod 9120. The locking and unlocking push button 9420 is configured to be pushed by a user (e.g., by a user kicking) to move the traction member 9410, so that the locking device S 9300 is unlocked under the drive of the traction member 9410. In this embodiment, the locking / releasing mechanism 9400 further includes a linkage 9430, a mounting base 9440, and a connector 9450. The locking / releasing push button 9420 is connected to the traction member 9410 via the linkage 9430. Specifically, the first end of the linkage 9430 is fixedly connected to the locking / releasing push button 9420 by, for example, a fastener, and the second end of the linkage 9430 is slidably connected to the mounting base 9440 via the connector 9450. The mounting base 9440 is fixed to the lower frame 9100. In this embodiment, the lower frame 9100 includes an inner frame 9130, which is located between two outer rods 9120 and is at a height higher than the plane of the two outer rods 9120. The mounting base 9440 is fixed within the inner frame 9130. In this case, the height of the mounting base 9440 is higher than the height of the locking / releasing push button 9420. As shown in Figure 86, the middle portion of the linkage 9430 is inclined, thereby achieving a height transition between the first end connected to the locking / releasing push button 9420 and the second end connected to the mounting base 9440. It can be understood that the linkage 9430 can be substantially straight when the inner frame 9130 and the outer rod 9120 are at the same height. It can also be understood that the linkage 9430 can be integrally formed with the locking / releasing push button 9420, or the linkage 9430 can be omitted and the locking / releasing push button 9420 can be slidably connected to the mounting base 9440. One end of the traction member 9410 connected to the locking / releasing member 9400 is fixed within the mounting base 9440 to the connector 9450. The connector 9450 is, for example, in the form of a pin. Mounting base 9440 is provided with guide groove 9441, which extends in a direction substantially perpendicular to the sliding direction of locking / unlocking push button 9420. The second end of linkage member 9430 is provided with drive groove 9431. Connector member 9450 passes through both guide groove 9441 and drive groove 9431, and is slidably embedded in both.When the locking / releasing button 9420 is pushed (or pressed) to move it toward the mounting base 9440, the connecting member 9450 connected to the traction member 9410 will move along the guide groove 9441 under the drive of the drive groove 9431, thereby pulling the traction member 9410. When the push (or press) on the locking / releasing button 9420 is removed, the locking / releasing button 9420 can return to its initial position under the action of, for example, the elastic restoring force of the elastic member (not shown).

[0318] According to the handcart 900 of this aspect, by setting the locking and unlocking device 9400 on the side of the lower frame 9100 and setting the locking and unlocking device 9400 to be operated by the user's foot kick, the user can unlock the locking device 9300 without bending over, thus simplifying the user's operation.

[0319] Referring back to Figure 83, the lower frame 9100 has a fixing rod 9110, which is disposed in the inner frame 9130 along, for example, the longitudinal direction of the inner frame 9130. Specifically, the fixing rod 9110 is located at the center of the inner frame 9130 in the transverse direction. A locking device 9300 is mounted on the fixing rod 9110. The locking device 9300 of this embodiment will now be described with reference to Figures 87 to 91.

[0320] As shown in Figure 87, the engaging device 9300 includes an engaging device housing 9310, and an engaging locking member 9320 and an unlocking retainer 9330, both at least partially disposed within the engaging device housing 9310. The engaging device housing 9310 includes an upper cover 9311 and a lower cover 9312. The tips of the engaging locking member 9320 and the unlocking retainer 9330 are adapted to extend from the upper cover 9311 of the engaging device housing 9310. The engaging locking member 9320 is movable between a locked position and an unlocked position. When the engaging locking member 9320 is in the locked position, it is adapted to secure a portable vehicle placed on the lower frame 9100±, and when the engaging locking member 9320 is in the unlocked position, it is adapted to release the securement of the portable vehicle to remove the portable vehicle from the lower frame 9100±. The release retainer 9330 is movable between an extended position and a retracted position. When the release retainer 9330 is in the extended position, its tip protrudes from the engaging device housing 9310. When the portable carrier is placed on the lower frame 9100, the release retainer 9330 is in the retracted position; when the portable carrier is removed from the lower frame 9100, the release retainer 9330 moves from the retracted position to the extended position. When the release retainer 9330 is pressed down into the retracted position, it allows the engaging locking member 9320 to move from the locked position to the release position and then restricts the engaging locking member 9320 from moving from the release position to the locked position. When this force is released, the release retainer 9330 moves from the retracted position to the extended position, allowing the engaging locking member 9320 to move from the release position to the locked position.

[0321] Referring to Figures 88 to 91, the locking and unlocking mechanism of the engaging device 9300 in this embodiment is basically the same as that of the engaging device 7000 described in the above embodiments. The main difference lies in the driving method of the engaging locking member 9320 of the engaging device 9300, which differs from the driving method of the engaging locking member 7010 of the engaging device 7000. The differences between the two will be mainly described below, and the similarities will not be repeated.

[0322] For example, the release retainer 9330 in this embodiment has the same construction and operating principle as the release retainer 7020 of the engaging device 7000. Furthermore, similar to the engaging device 7000, the engaging device 9300 also includes a sleeve 9340, a stop 9350, and a retaining drive 9360. The sleeve 9340, stop 9350, and retaining drive 9360 have the same construction and operating principle as the sleeve 7030, stop 7060, and retaining drive 7070 of the engaging device 7000. Further, similar to the engaging locking member 7010 of the engaging device 7000, the engaging locking member 9320 has a locking hook 9321 and a locking hole 9322. A portion of the locking hook 9321 is adapted to protrude through the engaging device housing 9310. A locking hook 9321 is used to engage a lever (e.g., lever 710 of the portable vehicle 700 described in the above embodiments) located at the bottom of the portable vehicle to secure the portable vehicle. When the locking member 9320 is in the locked position, the locking hook 9321 engages with the lever of the portable vehicle, and when the locking member 9320 is in the unlocked position, the locking hook 9321 disengages from the lever of the portable vehicle. A locking hole 9322 is adapted to engage with a stop 9350; specifically, the stop 9350 can be inserted into the locking hole 9322. When the locking member 9320 is in the unlocked position, the position of the locking hole 9322 aligns with the position of the stop 9350 towards the end of the locking member 9320, allowing the stop 9350 to be inserted into the locking hole 9322, thus holding the locking member 9320 in the unlocked position. In the engaging device 9300 of this embodiment, the engaging locking member 9320 is held in the unlocked position by the mutual cooperation of the release retaining member 9330, sleeve 9340, stop member 9350 and holding drive member 9360. This method is the same as that of the engaging device 7000 described in the above embodiment. For specific details, please refer to the above embodiment. It will not be repeated here.

[0323] In this embodiment, the engaging locking member 9320 is translatably disposed in the engaging device 9300 in a direction substantially perpendicular to the sliding direction of the stop member 9350. Specifically, the engaging locking member 9320 is translatable between a locked position where the position of the locking hole 9322 is not aligned with the position of the stop member 9350 facing the engaging locking member 9320, and an unlocking position where the position of the locking hole 9322 is aligned with the position of the stop member 9350 facing the engaging locking member 9320. The engaging device 9300 includes a first drive block 9370, which is configured such that when the engaging unlocking member 9400 is operated, under the drive of the traction member 9410, the first drive block 9370 moves in a direction perpendicular to the moving direction of the engaging locking member 9320, thereby driving the engaging locking member 2010 to move from the locked position to the unlocked position. For example, referring to Figure 89, when the locking / unlocking member 9400 is operated, under the drive of the traction member 9410, the first driving block 9370 moves in the first direction D1 (which is substantially parallel to the sliding direction of the stop member 9350) and pushes the locking member 9320 in the second direction D2 (which is substantially perpendicular to the sliding direction of the stop member 9350), causing the locking member 9320 to move from the locked position to the unlocked position. The fixing rod 9110 has a first limiting groove 9111 extending along the second direction D2, and the locking hook 9321 of the locking member 9320 passes through the first limiting groove 9111 from the fixing rod 9110. The first limiting groove 9111 is configured such that the engaging locking member 9320 is movable along the first limiting groove 9111 between the locked position and the unlocked position, and such that the engaging locking member 9320 remains in the second direction D2 without offset when moving between the locked position and the unlocked position. The fixing rod 9110 also has at least one second limiting groove 9112. The first driving block 9370 has at least one limiting hole 9371. The limiting member (not shown) is adapted to be inserted into the limiting hole 9371 and slidably embedded in the second limiting groove 9112. The second limiting groove 9112 restricts the sliding of the limiting member in the first direction D1. Correspondingly, through the sliding cooperation between the limiting member and the second limiting groove 9112, the movement of the first driving block 9370 can be maintained in the first direction D1. The number and position of the limiting holes 9371 correspond to the number and position of the second limiting grooves 9112. In this embodiment, two second limiting grooves 9112 and two limiting holes 9371 are provided. In other embodiments, only one second limiting groove 9112 and one limiting hole 9371 can be provided, or more than two second limiting grooves 9112 and a corresponding number of limiting holes 9371 can be provided.

[0324] The engaging device 9300 further includes a second drive block 9380 and a connecting rod 9381. The connecting rod 9381 is fixed to the fixed rod 9110 and extends along the second direction D2. The engaging locking member 9320 and the second drive block 9380 are slidably connected to the connecting rod 9381. Sliding of one of the engaging locking member 9320 and the second drive block 9380 along the connecting rod 9381 can drive the other of the engaging locking member 9320 and the second drive block 9380 to slide synchronously along the connecting rod 9381. In this embodiment, the engaging locking member 9320 and the second drive block 9380 are two independent components fixed together. In other embodiments, the engaging locking member 9320 and the second drive block 9380 can be integrally formed.

[0325] The first drive block 9370 has a sliding hole 9372 through which the connecting rod 9381 passes. The sliding hole 9372 is configured such that when the first drive block 9370 moves along the first direction D1 to drive the locking member 9320 to move between the locked and unlocked positions, the connecting rod 9381 will not interfere with the movement of the first drive block 9370. The first drive block 9370 has a first inclined surface, and the second drive block 9380 has a second inclined surface that matches the first inclined surface. The first inclined surface of the first drive block 9370 and the second inclined surface of the second drive block 9380 abut against each other. When the first drive block 9370 moves along the first direction D1, the second drive block 9380 will move along the second direction D2 under the drive of the first drive block 9370 through the sliding engagement of the first and second inclined surfaces. Conversely, when the second drive block 9380 moves along the second direction D2, the first drive block 9370 will move along the first direction D1 under the drive of the second drive block 9380 through the sliding engagement of the first inclined surface and the second inclined surface.

[0326] The engaging device 9300 further includes at least one first elastic element 9390 disposed between the engaging locking member 9320 and the engaging device housing 9310. In this embodiment, two first elastic elements 9390 are provided; in other embodiments, one or more first elastic elements 9390 may be provided. The first elastic elements 9390 are adapted to bias the engaging locking member 9320 toward the first drive block 9370. When the engaging locking member 9320 moves from the locked position to the unlocked position, the first elastic element 9390 is further compressed. When the locking member 9320 is in the unlocked position and the stop member 9350 is not engaged with the locking hole 9322, the locking member 9320 can drive the second drive block 9380 to move in the opposite direction of the second direction D2 along the connecting rod 9381 under the elastic restoring force of the first elastic member 9390, and push the first drive block 9370 to move in the opposite direction of the first direction D1 through the second drive block 9380, until the locking member 9320 moves from the unlocked position to the locked position.

[0327] The following is a brief description of the unlocking process of the locking device 9300 in this embodiment. When the portable carrier is placed on the lower frame 9100±, the locking hook 9321 of the locking member 9320 engages with the locking lever of the portable carrier, the unlocking retainer 9330 is in the retracted position, and the stop member 9350 is abutted by the locking member 7010 in the locked position. When the locking and unlocking member 9400 is operated, the first driving block 9370 moves in the first direction D1 under the drive of the traction member 9410. Through the sliding engagement of the first inclined surface of the first driving block 9370 and the second inclined surface of the second driving block 9380, the first driving block 9370 drives the second driving block 9380 to move in the second direction D2, and the locking member 9320 moves from the locked position to the unlocked position along with the second driving block 9380 in the second direction D2. When the locking member 9320 is in the unlocked position, the position of the locking hole 9322 is aligned with the position of the stop member 9350 facing the locking member 9320, and the stop member 9350 is inserted into the locking hole 9322, so that the stop member 9350 engages with the locking hole 9322. At this time, because the stop member 9350 is engaged with the locking hole 9322, the stop member 9350 prevents the locking member 9320 from translating. When the locking release member 9400 is released, even if the locking member 9320 is pushed by the first elastic member 9390, it cannot be translated to the locked position. Therefore, the locking member 9320 remains in the unlocked position. When the portable carrier is removed from the lower frame 9100±, the release retainer 9330 moves from the retracted position to the extended position, and the stop 9350 moves in the opposite direction of the first direction D1 under the action of the retaining drive 9360, and moves out of the locking hole 9322 to disengage from the locking hole 7014. At this time, the locking member 9320 moves in the opposite direction of the second direction D2 under the action of the elastic restoring force of the first elastic member 9390 until it is translated to the locking position. The release process of the locking device 9300 in this embodiment is similar to the release process of the locking device 7000 described in the above embodiment. Specific details can be referred to in the above embodiment, and will not be repeated here. Figures 92 to 95 show a locking device according to another embodiment of the present disclosure. The main difference between the locking device in this embodiment and the locking device in the above embodiment is the structure of the locking member and its connection method. The following will mainly describe the differences between the locking device in this embodiment and the locking device in the above embodiment, and the similarities will not be repeated.

[0328] Referring to Figure 93, the locking member 9320 has a slot 9323. In this embodiment, the slot 9323 is a through hole; in other embodiments, the slot 9323 may also be a blind hole. Referring to Figures 94 and 95, the locking device 9300 is provided with an insert plate 9382. One end of the insert plate 9382 is fixed to the second drive block 9380, and the other end of the insert plate 9382 is inserted into the slot 9323 to fix the locking member 9320 to the second drive block 9380. In this embodiment, the insert plate 9382 and the second drive block 9380 are two independent components fixed together; in other embodiments, the insert plate 9382 and the second drive block 9380 may be integrally formed.

[0329] Returning to Figure 83, the trolley 900 also includes a shelf 9500 detachably mounted on the handlebar 9200. Specifically, the handlebar 9200 includes two push rods 9210 extending generally parallel to each other and a handlebar 9220 extending between the tips of the two push rods 9210. The opposite ends of the shelf 9500 are detachably mounted to the two push rods 9210.

[0330] Referring to Figure 96, the shelf 9500 has, for example, a receiving cavity 9510 for holding cups or other items. The receiving cavity 9510 can be designed with different cross-sectional shapes and sizes to accommodate different items as needed. For example, the receiving cavity 9510 can be designed with a circular cross-section to accommodate generally cylindrical cups or bottles, or it can be designed with a rectangular cross-section to accommodate mobile phones. The opening of the receiving cavity 9510 can be provided with at least one inwardly extending clamping portion 9511, which is made of, for example, an elastic material. When an object is placed in the receiving cavity 9510, the clamping portion 9511 can abut against the object, preventing the object from wobbling in the receiving cavity 9510 and preventing the object from easily falling out of the receiving cavity 9510. The clamping part 9511 can be designed with different shapes, as long as it can abut against the object contained in the receiving cavity 9510 to clamp the object at the opening of the receiving cavity 9510. For example, in some embodiments, a plurality of clamping parts 9511 can be evenly arranged around the inner periphery of the opening of the receiving cavity 9510, each clamping part 9511 having, for example, an arc-shaped edge, while in some embodiments, a long strip-shaped clamping part 9511 can be provided at a local edge of the opening of the receiving cavity 9510.

[0331] One of the shelf 9500 and the rider 9200 is provided with a first connecting member, and the other of the shelf 9500 and the push rod 9210 is provided with a second connecting member that can be detachably connected to the first connecting member. The first and second connecting members can be connected together by detachable connection methods such as elastic snap-fit, snap-fit, pin connection, and threaded connection, so that the shelf 9500 can be detachably installed on the rider 9200. For example, referring to Figures 97 and 98, in this embodiment, the first and second connecting members are connected to each other by elastic snap-fit. Specifically, the push rod 9210 of the rider 9200 is provided with a fixing seat 9230 for mounting the shelf 9500, and the shelf 9500 is provided with a locking seat 9520 for connecting the fixing seat 9230. It is understood that in other embodiments, the locking seat 9520 can be provided on the push rod 9210, and the fixing seat 9230 on the shelf 9500. Continuing to refer to Figures 97 and 98, the locking seat 9520 is adapted to engage with the fixing seat 9230 for installation. The fixing seat 9230 is provided with a locking groove 9231, and the locking seat 9520 is provided with a resilient portion 9521. When the fixing seat 9230 is inserted into the locking seat 9520 and the two are assembled in place, the resilient portion 9521 can engage with the locking groove 9231. Through the engaging engagement of the elastic part 9521 and the engaging groove 9231, the engaging seat 9520 can be held fixed in place by the fixed seat 9230, thereby allowing the shelf 9500 to be securely mounted on the handlebar 9200. Figures 99 to 102 show another embodiment of the handcart according to the above aspects. The main difference between the handcart in this embodiment and the handcart in the above embodiment lies in the structure and position of the engaging and releasing mechanism. The following will mainly describe the differences between the handcart in this embodiment and the handcart in the above embodiment; similarities will not be repeated.

[0332] Referring to Figures 99 and 100, the trolley 900 includes a support member 9600 connecting the handlebar 9200 and the lower frame 9100. The support member 9600 is also folded down during the process of the handlebar 9200 switching from an unfolded state to a folded state. Specifically, the support member 9600 includes a first rod 9610 and a second rod 9620 pivotally connected to each other. One end of the first rod 9610 is connected to the rider 9200, and the other end of the first rod 9610 is pivotally connected to the second rod 9620. One end of the second rod 9620 is pivotally connected to the first rod 9610, and the other end of the second rod 9620 is pivotally connected to the outer rod 9120 of the lower frame 9100. In this embodiment, the trolley 900 includes a locking / unlocking member 9700. Similar to the locking / unlocking member 9400 described in the above embodiments, the locking / unlocking member 9700 can be operated to release the locking device 9300 from the locking lever 710 of the portable vehicle, such as the portable vehicle 700 described above. The difference from the above embodiment is that the locking / unlocking member 9700 is disposed on the support member 9600. Specifically, the locking / unlocking member 9700 is disposed on the second rod 9620 of the support member 9600. Referring to Figures 101 and 102, the locking / unlocking member 9700 is connected to the locking device 9300 via the traction member 9710. The trolley 900 has a generally symmetrical structure, with support members 9600 on both the left and right sides. It can be understood that although in this embodiment the locking / unlocking member 9700 is disposed on the left support member 9600, in other embodiments the locking / unlocking member 9700 may be disposed on the right support member 9600, or the locking / unlocking member 9700 may be disposed on both the left and right support members 9600. The traction member 9710 and the locking / unlocking member 9700 are shown in Figures 101 and 102. One end of the connection, the other end of the traction member 9710, is connected to the engaging device 9300. It can be understood that the traction member 9710 can be arranged between the engaging / releasing member 9700 and the engaging device 9300 along any suitable path, which will not be elaborated here.

[0333] Referring again to Figures 101 and 102, the locking / releasing mechanism 9700 includes a locking / releasing handle 9720 and a fixing pin 9730 fixed to the locking / releasing handle 9720. One end of the traction member 9710, which is connected to the locking / releasing mechanism 9700, is fixedly connected to the fixing pin 9730. The locking / releasing handle 9720 is, for example, in the form of a sleeve, and is slidably disposed on a second member 9620. Sliding grooves 9621 are formed on opposite sides of the second member 9620. Both ends of the fixing pin 9730 pass through the two sliding grooves 9621 respectively and are fixed to the locking / releasing handle 9720, allowing the fixing pin 9730 to slide along the sliding grooves 9621. Through the sliding engagement of the fixing pin 9730 and the sliding grooves 9621, the locking / releasing handle 9720 can be pulled to move upward relative to the second member 9620. When the locking and unlocking handle 9720 is pulled upward, the locking and unlocking handle 9720 will drive the traction member 9710 to move, thereby realizing the unlocking of the locking device 9300.

[0334] Figures 103 to 106 illustrate a handcart according to another embodiment of the above aspects. The main difference between the handcart in this embodiment and the handcart in the above embodiments shown in Figures 83 to 86 lies in the structure and operation of the locking and unlocking mechanism. The following will mainly describe the differences between the handcart in this embodiment and the handcart in the above embodiments; similarities will not be repeated.

[0335] Referring to Figures 103 and 104, the trolley 900 includes a lower frame 9100 and a handlebar 9200, the handlebar 9200 being pivotally connected to the front end of the lower frame 9100. The top of the lower frame 9100 is adapted to provide a support platform (not shown) for carrying a portable vehicle. The lower frame 9100 is provided with an engaging device 9300 and an engaging-releasing element 9800. Similar to the engaging-releasing element 9400 in the above embodiment, the engaging-releasing element 9800 is provided on the side of the lower frame 9100, particularly on the outward-facing side of the outer rod 9120, for user operation. It is understood that, although in the illustrated embodiment the locking / unlocking element 9800 is located on the left side of the lower frame 9100, i.e., on the outer left side rod 9120, in other embodiments the locking / unlocking element 9800 may be located on the right side of the lower frame 9100, or on the front or rear side of the lower frame 9100. Furthermore, it is understood that, although only one locking / unlocking element 9800 is provided in the illustrated embodiment, in other embodiments two or more locking / unlocking elements 9800 may be provided, and these locking / unlocking elements 9800 may be respectively located on different sides of the lower frame 9100.

[0336] The user can release the locking device 9300 by operating the locking / unlocking component 9800. Referring to Figure 105, the locking / unlocking component 9800 is connected to the locking device 9300 via a traction component 9810. Figure 105 shows one end of the traction component 9810 connected to the locking / unlocking component 9800. The other end of the traction component 9810 extends through the inner frame 9130 and the fixing rod 9110, connecting to the locking device 9300. It can be understood that the traction component 9810 can be arranged along any suitable path between the locking / unlocking component 9800 and the locking device 9300, which will not be elaborated further here. Unlike the above embodiment where the user releases the locking device 9300 by, for example, kicking the locking / unlocking component 9400, in this embodiment, the user releases the locking device 9300 by, for example, stepping on the locking / unlocking component 9800.

[0337] Referring to Figures 105 and 106, the locking / unlocking mechanism 9800 includes a locking / unlocking pedal 9820 pivotally connected to an outer rod 9120. The locking / unlocking pedal 9820 is configured to be pressed by a user (e.g., by stepping on it) to move a traction member 9810, causing the locking device 9300 to release under the actuation of the traction member 9810. In this embodiment, the locking / unlocking mechanism 9800 also includes a mounting base 9830 fixed to the outer rod 9120. The locking / unlocking mechanism 9800 is pivotally connected to the mounting base 9830 via a pivot shaft 9831. One end of the traction member 9810 connected to the locking / unlocking mechanism 9800 passes through a traction member sheath 9811 fixed to the mounting base 9830 and connects to the locking / unlocking pedal 9820. The locking and releasing pedal 9820 includes a pedal portion 9821 and a connecting portion 9822. At least a portion of the pedal portion 9821 extends from the outer rod 9120 for operation by a user, such as by stepping on it. The connecting portion 9822 is used to connect the head of the end of the traction member 9810 connected to the locking and releasing member 9800. The pedal portion 9821 and the connecting portion 9822 are generally located on opposite sides of the pivot axis 9831. When the pedal portion 9821 rotates downward relative to the pivot axis 9831, the connecting portion 9822 rotates upward relative to the pivot axis 9831, and vice versa. Specifically, when the pedal portion 9821 is pressed down to rotate downward relative to the pivot axis 9831, the connecting portion 9822 rotates upward relative to the pivot axis 9831, and the connecting portion 9822 pulls the traction member 9810. This releases the locking device 9300. When the downward pressure on the pedal portion 9821 is released, the locking and unlocking pedal 9820 can return to its initial position under the action of, for example, the elastic restoring force of an elastic element (not shown).

[0338] According to the handcart 900 of this aspect, by setting the locking / unlocking member 9800 on the side of the lower frame 9100 and setting the locking / unlocking member 9800 to be operated by the user stepping on it, the user can release the locking / unlocking device 9300 without bending over, thus simplifying the user operation. It is understood that the related structure and setting position of at least one of the locking / unlocking device and locking / unlocking member proposed in this aspect can be applied to the handcart proposed in any aspect of this disclosure. It is also understood that, where there is no conflict, the locking / unlocking device according to any embodiment of any aspect of this disclosure can be used in conjunction with the locking / unlocking member according to any embodiment of any aspect of this disclosure.

[0339] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0340] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be determined by the appended claims.

Claims

Claims 1. A handcart having a liftable frame, said frame comprising: Upper frame; Lower frame; A support mechanism is disposed between the upper frame and the lower frame, and includes a first support and a second support pivotally connected to each other. The pivoting of the first support and the second support relative to each other enables the upper frame to rise or fall. A lifting adjustment component is slidably disposed on the upper frame and can be switched between a locked state and an unlocked state; And a lifting adjustment release mechanism, configured to operate to switch the lifting adjustment mechanism from the locked state to the released state; wherein, one of the first bracket and the second bracket is pivotally connected to the lifting adjustment mechanism, and the other of the first bracket and the second bracket is pivotally connected to the upper frame; When the lifting adjustment member is in the locked state, it prevents the lifting adjustment member from sliding relative to the upper frame, while when the lifting adjustment member is in the unlocked state, it allows the lifting adjustment member to slide relative to the upper frame.

2. The handcart according to claim 1, characterized in that: The support mechanism further includes a drive rod, which is slidably and rollably connected to the upper frame relative to the upper frame. The lifting adjustment member is connected to the drive rod, and the front end of the upper frame is fixedly connected to the drive rod. The lifting adjustment component is configured such that when the lifting adjustment component is in the locked state, it prevents the drive rod from sliding relative to the upper frame, and when the lifting adjustment component is in the unlocked state, it allows the drive rod to slide relative to the upper frame.

3. The handcart according to claim 2, characterized in that: The upper frame includes longitudinal bars that extend along the front-rear direction of the upper frame; The lifting adjustment component includes a sliding sleeve that is slidable along a portion of the longitudinal rod; and The drive rod is connected to the sliding sleeve.

4. The handcart according to claim 3, characterized in that: The upper frame further includes a limiting member, which is disposed along the longitudinal rod, and the sliding sleeve is slidably disposed on the limiting member; and the lifting adjustment member includes a sliding locking member, which is configured to selectively engage or disengage with the limiting member. When the sliding locking member engages with the limiting member, the lifting adjustment member is in the locked state, preventing the sliding sleeve from sliding relative to the limiting member; and when the sliding locking member disengages from the limiting member, the lifting adjustment member is in the unlocked state, allowing the sliding sleeve to slide relative to the limiting member.

5. The handcart according to claim 4, characterized in that: The limiting member is provided with multiple limiting grooves, and the sliding locking member is adapted to selectively engage with one or more of the multiple limiting grooves to limit the height of the upper frame relative to the lower frame.

6. The handcart according to claim 3, characterized in that: The upper frame also includes an outer frame body, the longitudinal rods are located within the outer frame body, and upper sliding grooves are respectively provided on opposite inner sides of the outer frame body; and The drive rod passes through the sliding sleeve, and both ends of the drive rod are slidably disposed in the upper sliding groove.

7. The handcart according to claim 1, characterized in that: The upper frame includes a limiting rod extending along the longitudinal direction of the upper frame, and the limiting rod is rotatable about its axis. The lifting adjustment component is sleeved on the limiting rod; When the lifting adjustment component is in the locked state, the lifting adjustment component can move axially along the limit rod by rotating the limit rod.

8. The handcart according to claim 7, characterized in that: The limiting rod includes a screw; The lifting adjustment component includes a sliding sleeve and a sliding locking component movably disposed in the sliding sleeve; The sliding sleeve is fitted onto the limiting rod, and the sliding locking member is adapted to selectively engage or disengage from the screw.

9. The handcart according to claim 1, characterized in that, The vehicle frame also includes a support platform disposed on the upper frame and adapted to support a portable vehicle; The upper frame includes a locking device, which is configured to fix the portable vehicle supported on the support platform.

10. The handcart according to claim 1, characterized in that: The front end of the first bracket is slidably and rotatably connected to the front part of the upper frame relative to the upper frame, and the rear end of the first bracket is pivotally connected to the rear part of the lower frame. The front end of the second bracket is slidably and rotatably connected to the front part of the lower frame relative to the lower frame, and the rear end of the second bracket is pivotally connected to the rear part of the upper frame.

11. The handcart according to claim 1, characterized in that: The support mechanism includes a first X-shaped support mechanism composed of the first support and the second support; The support mechanism further includes at least one second X-shaped support mechanism located below the first X-shaped support mechanism, and the first X-shaped support mechanism and the at least one second X-shaped support mechanism are stacked.

12. The handcart according to claim 1, characterized in that, The chassis also includes: A first traction member has one end connected to the lifting adjustment release member and the other end connected to the lifting adjustment member. When the lifting adjustment release member is operated, the first traction member drives the lifting adjustment member to switch from the locked state to the unlocked state. When the lifting adjustment release member is not operated, the lifting adjustment member automatically switches from the unlocked state to the locked state.

13. The handcart according to claim 1, characterized in that, The frame also includes a pneumatic strut, one end of which is pivotally connected to the lower frame, and the other end of which is pivotally connected to one of the first bracket and the second bracket.

14. A handcart, comprising: Frame; A carrying platform, which is disposed on the top or bottom of the vehicle frame and is adapted to carry a portable vehicle; Engaging device, comprising: A locking element movable between a locked position and an unlocked position, wherein when the locking element is in the locked position, the locking element is adapted to secure the portable vehicle supported on the support platform; and The release retainer is movable between the extended and retracted positions; Specifically, when the release retainer is pressed down to the retracted position, the engaging locking member is allowed to move from the locked position to the release position, and then the engaging locking member is restricted from moving from the release position to the locked position; when the force is released and the release retainer moves from the retracted position to the extended position, the engaging locking member is allowed to move from the release position to the locked position.

15. The handcart according to claim 14, characterized in that, The handcart also includes: A locking / unlocking mechanism configured to be operable to move the locking / unlocking member from the locked position to the unlocked position; and a drive block configured to move toward the locking / unlocking member when the locking / unlocking mechanism is operated, thereby driving the locking / unlocking member to move from the locked position to the unlocked position. When the release retainer is in the retracted position, the drive block is adapted to hold the locking member in the release position.

16. The handcart according to claim 15, characterized in that, The engaging device further includes: A stop element, which is slidably disposed in the release retainer; When the release retainer is in the retracted position, the stop is adapted to engage with the drive block; When the drive block engages with the stop, the drive block prevents the locking member from moving from the unlocked position to the locked position.

17. The handcart according to claim 15, characterized in that, The handcart also includes a second traction component, one end of which is connected to the drive block, and the other end of which is connected to the locking and unlocking component.

18. The handcart according to claim 14, characterized in that: The trolley also includes a locking / unlocking mechanism configured to operate to pivot or translate the locking member from the locked position to the unlocked position; the locking device further includes a retaining drive and a stop slidable relative to the retaining drive, the retaining drive being movable between a first position and a second position, the retaining drive being closer to the locking member in the first position than in the second position; When the release retainer is pressed down to the retracted position, the retaining drive is in the first position; The locking component is provided with a stop fitting; When the retaining drive is in the first position and the engaging locking member pivots or translates to the unlocking position, the stop is adapted to engage with the stop engagement member.

19. The handcart according to claim 14, characterized in that, When the portable vehicle is carried on the support platform, the release retainer is in the retracted position, and when the portable vehicle is removed from the support platform, the release retainer moves from the retracted position to the extended position.

20. A handcart, comprising: Frame; A carrying platform, which is disposed on the top or bottom of the vehicle frame and is adapted to carry a portable vehicle; as well as Engaging device, comprising: A locking element is movable between a locked position and an unlocked position. When the locking element is in the locked position, the locking element is adapted to secure the portable vehicle carried on the carrying platform. as well as An elastic element adapted to act on the engaging locking element to cause the engaging locking element to translate or pivot from the unlocked position to the locked position.

21. The handcart according to claim 20, characterized in that: The chassis also includes: The lower frame, wherein the engaging device is disposed on the lower frame; The driver, pivotally connected to the lower frame; and The locking and unlocking mechanism is configured to be operable to translate or pivot the locking and unlocking mechanism from the locked position to the unlocking position, thereby releasing the locking and unlocking mechanism from the portable vehicle; in: The locking and unlocking mechanism is disposed on the lower frame; or The rider includes a lower support rod and an upper support rod pivotally connected to the lower support rod, and the locking / unlocking device is disposed at the pivot point between the upper support rod and the lower support rod; or The frame includes a support member connecting the rider and the lower frame, and the locking / unlocking mechanism is disposed on the support member.

22. The handcart according to claim 20, characterized in that, The engaging device further includes a release retainer movable between an extended position and a retracted position. When the release retainer is pressed down into the retracted position, it allows the engaging locking member to move from the locked position to the released position and then restricts the engaging locking member from moving from the released position to the locked position. When the force is released and the release retainer moves from the retracted position to the extended position, it allows the engaging locking member to move from the released position to the locked position.

23. The handcart according to claim 20, characterized in that: The locking and unlocking mechanism includes a locking and unlocking mechanism housing; When the locking and releasing member is located at the pivot joint between the upper support rod and the lower support rod, the locking and releasing member is provided with an anti-pinch member, which is pivotally connected to the housing of the locking and releasing member.

Images