trolley

Abstract

A stroller is disclosed having a liftable frame including an upper frame, a lower frame, a support mechanism, a lift adjustment member, and a lift adjustment release member. The support mechanism includes a first support and a second support that are pivotally coupled to one another, the pivoting of the first support and the second support relative to one another enabling the upper frame to be raised or lowered. The lift adjustment member is slidably disposed on the upper frame and is switchable between a locked state and a released state. The lift adjustment release member is configured to be operable to switch the lift adjustment member from the locked state to the released state. One of the first support and the second support is pivotally connected to the lift adjustment member, and the other of the first support and the second support is pivotally connected to the upper frame. When the lift adjustment member is in the locked state, the sliding of the lift adjustment member relative to the upper frame is restricted, and when the lift adjustment member is in the released state, the sliding of the lift adjustment member relative to the upper frame is permitted.

Description

Technical Field

[0001] This invention relates to handcarts, and more particularly to handcarts capable of carrying portable vehicles. Background Technology

[0002] 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.

[0003] 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.

[0004] 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. Summary of the Invention

[0005] The object of this invention is to provide an improved handcart capable of carrying portable vehicles.

[0006] One aspect of the present invention provides a handcart having a height-adjustable frame, the frame comprising: an upper frame; a lower frame; a support mechanism disposed between the upper frame and the lower frame, and including 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 enabling the upper frame to rise or fall; a height adjustment member slidably disposed on the upper frame and switchable between a locked state and an 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 support and the second support is pivotally connected to the height adjustment member, and the other of the first support and the second support 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.

[0007] In some embodiments of the present invention, 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 the lifting adjustment member is in the locked state, it prevents the drive rod from sliding relative to the upper frame, and when the lifting adjustment member is in the unlocked state, it allows the drive rod to slide relative to the upper frame.

[0008] In some embodiments of the present invention, the upper frame includes a longitudinal rod extending in the front-rear direction of the upper frame; 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.

[0009] In some embodiments of the present invention, 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.

[0010] In some embodiments of the present invention, 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.

[0011] In some embodiments of the present invention, 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.

[0012] In some embodiments of the present invention, 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.

[0013] In some embodiments of the invention, the frame further includes a support platform disposed on the upper frame and adapted to support a portable vehicle. The upper frame includes a locking device configured to secure the portable vehicle supported on the support platform.

[0014] Another aspect of the present invention 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 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 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 locking member to move from the locked position to the unlocked position and then restricts the 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 locking member to move from the unlocked position to the locked position.

[0015] In some embodiments of the invention, 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.

[0016] In some embodiments of the present invention, 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.

[0017] In some embodiments of the invention, 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 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 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.

[0018] Another aspect of the invention 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.

[0019] In some embodiments of the invention, 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.

[0020] In some embodiments of the present invention, the slide is slidably disposed in the front portion of the upper frame. When the slide is in the retracted state, the slide is retracted into 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.

[0021] In some embodiments of the invention, the slide is detachably connected to the upper frame.

[0022] Another aspect of the present invention 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.

[0023] In some embodiments of the present invention, 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.

[0024] In some embodiments of the present invention, 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.

[0025] Another aspect of the present invention 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.

[0026] In some embodiments of the present invention, the frame further includes: a lower frame, wherein the engaging device is disposed on the lower frame; a rider pivotally connected to the lower frame; and an engaging release member configured to be operable 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.

[0027] In some embodiments of the present invention, the locking and unlocking mechanism is disposed on the lower frame.

[0028] In some embodiments of the present invention, the rider includes a lower support rod and an upper support rod pivotally connected to the lower support rod, and the locking / unlocking member is disposed at the pivot point between the upper support rod and the lower support rod.

[0029] In some embodiments of the invention, the frame includes a support member connecting the rider and the lower frame, and the locking / unlocking member is disposed on the support member. Attached Figure Description

[0030] The features and advantages of the invention will be better understood through the following detailed description of exemplary embodiments utilizing the principles of the invention, with reference to the accompanying drawings:

[0031] Figure 1 A schematic diagram of a handcart according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of a handcart loaded with a portable carrier according to an embodiment of the present invention;

[0033] Figure 3A A side view of a handcart according to an embodiment of the present invention, wherein the frame is at a first height in the unfolded state;

[0034] Figure 3BA side view of a handcart according to an embodiment of the present invention, wherein the frame is at a second height in the unfolded state;

[0035] Figure 3C A side view of a handcart according to an embodiment of the present invention, wherein the frame is in a folded state;

[0036] Figure 4 This is a side view of a portion of the structure of a handcart according to an embodiment of the present invention;

[0037] Figure 5 for Figure 4 An exploded view of the components of the handcart shown;

[0038] Figure 6 and Figure 7 They are respectively Figure 4 The diagram shows the handcart from different perspectives, and also shows enlarged views of some of its structures.

[0039] Figure 8 for Figure 5 The diagram shows the bottom of the upper frame;

[0040] Figure 9 for Figure 8 An enlarged schematic diagram of the limiting component shown;

[0041] Figure 10 and Figure 11 These are top and bottom views of the upper frame having a lifting adjustment component mounted on the limiting member, respectively;

[0042] Figure 12 for Figure 10 A partial sectional view of the upper frame shown;

[0043] Figure 13A and Figure 13B These are schematic diagrams showing the sliding locking component in the engaged and disengaged positions, respectively.

[0044] Figure 14 for Figure 10 The diagram shows a bottom view of some components of the upper frame, and also includes an enlarged view of the partial structure.

[0045] Figure 15A for Figure 14 The diagram shows a partial structure of the upper frame from another perspective, in which the sliding lock is in the disengaged position;

[0046] Figure 15B for Figure 14 The diagram shows a partial structure of the upper frame from another perspective, in which the sliding locking element is in the engaged position;

[0047] Figure 16 A handcart according to an embodiment of the present invention is shown, and a portable carrier suitable for loading the handcart is also shown;

[0048] Figure 17 This is a schematic diagram of an upper frame loaded with a portable vehicle according to an embodiment of the present invention;

[0049] Figure 18A For along Figure 17 A partial sectional view of the upper frame of line AA in the diagram;

[0050] Figure 18B For along Figure 17 A partial sectional view of the upper frame of the BB line in the diagram;

[0051] Figure 18C for Figure 18A A schematic diagram of the engaging device when the engaging locking element moves to the unlocking position;

[0052] Figure 18D for Figure 18C A schematic diagram of the locking device after the portable vehicle has been removed;

[0053] Figure 19 for Figure 17 The bottom view of some components of the upper frame shown;

[0054] Figure 20 for Figure 19 A schematic diagram of the locking and unlocking mechanism in the middle;

[0055] Figure 21A This is a schematic diagram of a portion of the engaging device, in which the stop element engages with the drive block;

[0056] Figure 21B This is a schematic diagram of a portion of the engaging device, in which the stop is disengaged from the drive block;

[0057] Figure 22 A side view of a handcart according to an embodiment of the present invention, wherein the rider is in the unfolded position;

[0058] Figure 23 A side view of a handcart according to an embodiment of the present invention, wherein the rider is in an extended position and a folded position;

[0059] Figure 24 A side view of a handcart according to an embodiment of the present invention, wherein the rider is in a folded position;

[0060] Figure 25 A side view of a handcart according to an embodiment of the present invention, wherein the rider is in a folded position and the frame is in a folded state;

[0061] Figure 26A A schematic diagram of a handcart according to an embodiment of the present invention;

[0062] Figure 26B for Figure 26A A cross-sectional view of the local structure of region R in the diagram;

[0063] Figure 27 and Figure 28 They are respectively Figure 22 The diagram shows the handcart from different perspectives, and also shows enlarged views of some parts of the structure;

[0064] Figure 29 and Figure 30 They are respectively Figure 22 and Figure 24 The bottom view of the handcart shown;

[0065] Figure 31 This is a schematic diagram of a portion of the structure of a handcart according to an embodiment of the present invention;

[0066] Figure 32 An exploded view of a portion of the rider's components, including the rider's retraction control.

[0067] Figure 33 A cross-sectional view showing the positional change of the driver's retraction control before and after it is operated;

[0068] Figure 34 for Figure 31 The diagram shown is a schematic representation of the structure after the outer cover has been removed.

[0069] Figure 35 for Figure 34 A bottom view of the structure shown;

[0070] Figure 36 and Figure 37 They are respectively Figure 34 The diagram shows the structure after the base plate has been removed, viewed from different angles.

[0071] Figure 38 For along Figure 36 A cross-sectional view of the driver deploying the locking device on the CC line;

[0072] Figure 39A and 39B The diagram shows cross-sectional views of the rider engaging the locking device in both the locked and unlocked states.

[0073] Figure 40 A side view of a handcart with a slide according to an embodiment of the present invention, wherein the slide is in a folded state;

[0074] Figure 41A side view of a handcart with a slide according to an embodiment of the present invention, wherein the slide is in an unfolded state;

[0075] Figure 42 for Figure 41 A schematic diagram showing a handcart in use;

[0076] Figure 43 A side view of a handcart with a slide according to another embodiment of the present invention, wherein the slide is in a folded state;

[0077] Figure 44 A side view of a handcart with a slide according to another embodiment of the present invention, wherein the slide is in an unfolded state;

[0078] Figure 45 The frame of a handcart according to an embodiment of the present invention is shown;

[0079] Figure 46 This is a schematic diagram of a handcart with side panels according to an embodiment of the present invention;

[0080] Figure 47 for Figure 46 A schematic diagram of the bottom of the handcart shown;

[0081] Figure 48A and Figure 48B These are schematic diagrams of the top cover according to an embodiment of the present invention from different perspectives;

[0082] Figure 49 This is a schematic diagram of a handcart with side panels according to another embodiment of the present invention.

[0083] Figure 50 A schematic diagram of a handcart according to an embodiment of the present invention;

[0084] Figure 51 for Figure 50 The diagram shown is an exploded view of the handcart's components.

[0085] Figure 52A for Figure 50 The side view of the handcart shown shows the first height of the cart frame in its unfolded state;

[0086] Figure 52B for Figure 50 The side view of the handcart shown shows the second height of the cart in its unfolded state;

[0087] Figure 52C for Figure 50 The side view of the handcart shown shows the frame in a folded state;

[0088] Figure 53A for Figure 50 A schematic diagram of part of the structure of the handcart shown;

[0089] Figure 53B for Figure 53A The diagram shows a partial structure of the handcart from another perspective, in which the outer shell of the lower frame has been removed;

[0090] Figure 54 Figure 53 shows a schematic diagram of a portion of the handcart's structure from another perspective, and also shows an enlarged view of the partial structure.

[0091] Figure 55A and Figure 55B They are respectively Figure 50 The diagram shows a top view of a portion of the handcart's structure with an upper frame, where the lifting adjustment mechanism is located... Figure 55A The middle is in the first position, and the lifting adjustment component is in Figure 55B It is in the second position;

[0092] Figure 56 for Figure 54 The diagram shows the handcart from another perspective, with the lifting adjustment component in the first position;

[0093] Figure 57A for Figure 55A A schematic diagram of the structure shown from another perspective is presented, along with an enlarged view of a local structure.

[0094] Figure 57B For along Figure 57A A partial sectional view of the lifting and adjusting release mechanism of the DD line in the diagram;

[0095] Figure 58 for Figure 55A The diagram shows the structure from another perspective, and also shows an enlarged view of a local structure;

[0096] Figure 59A and Figure 59B respectively along Figure 58 A sectional view of the partial structure of the EE line with a lifting adjustment component, wherein the lifting adjustment component is in Figure 59A The middle is in the locked state, and the lifting adjustment part is in Figure 59B The lock is in the unlocked state;

[0097] Figure 60 A schematic diagram of a handcart according to another embodiment of the present invention;

[0098] Figure 61 This is a schematic diagram of a handcart loaded with a portable carrier according to an embodiment of the present invention;

[0099] Figure 62A handcart according to an embodiment of the present invention is shown, as well as a portable carrier suitable for loading the handcart, and an enlarged view of a partial structure is shown;

[0100] Figure 63 for Figure 62 A schematic diagram of the handcart from another perspective, and an enlarged view of its partial structure is shown;

[0101] Figure 64A and Figure 64B Show each Figure 62 The top and bottom of the upper frame of the handcart;

[0102] Figure 65 Show Figure 62 The handcart in the middle has a locking and unlocking mechanism and a locking device connected by a traction member, wherein the locking device housing of the locking device has been removed;

[0103] Figure 66A For along Figure 65 A cross-sectional view of the locking mechanism of the FF line, wherein the locking mechanism is not pressed;

[0104] Figure 66B for Figure 66A A schematic diagram of the cross-section of the locking and unlocking mechanism when it is pressed.

[0105] Figure 67 To show Figure 62 A top view of the upper frame of the handcart equipped with the locking device, in which the top cover of the locking device housing has been removed;

[0106] Figure 68 To show Figure 62 A bottom view of the upper frame of the handcart equipped with the locking device, in which the upper and lower covers of the locking device housing have been removed;

[0107] Figure 69 This is a schematic diagram of part of the locking device;

[0108] Figure 70 for Figure 65 Component exploded view of region S in the diagram;

[0109] Figure 71A This is a schematic diagram showing the locking element in the 68 when it is in the locked position.

[0110] Figure 71B This is a schematic diagram showing the locking element in 68 in the unlocked position.

[0111] Figure 72A For along Figure 69 A cross-sectional view of a portion of the GG line locking device, wherein the release retainer is pressed;

[0112] Figure 72B for Figure 72A The diagram shows a partial cross-sectional view of the locking device when the release retainer is not pressed.

[0113] Figure 73A and Figure 73B These are schematic diagrams of parts of the engaging device, where... Figure 73A The locking mechanism of the card is in the locked position. Figure 73B The locking mechanism of the card is in the unlocked position;

[0114] Figure 74 A schematic diagram of a handcart according to an embodiment of the present invention;

[0115] Figure 75 for Figure 74 The diagram shown illustrates a handcart loaded with a portable vehicle.

[0116] Figure 76 for Figure 75 A schematic diagram of the bottom of the handcart shown;

[0117] Figure 77 for Figure 74 The diagram shows the handcart after the support platform has been removed, and an enlarged view of the partial structure is also shown.

[0118] Figure 78 for Figure 77 The diagram shows the handcart from another perspective, and also shows an enlarged view of a partial structure;

[0119] Figure 79 for Figure 77 The diagram shows a handcart from another perspective, in which part of the locking and unlocking housing has been removed, and an enlarged view of the partial structure is shown;

[0120] Figure 80 for Figure 77 The diagram shows the handcart during the folding process;

[0121] Figure 81 This is a schematic diagram of a handcart according to another embodiment of the present invention, and an enlarged view of a partial structure is shown;

[0122] Figure 82 for Figure 81 The diagram shows a handcart from another perspective, and an enlarged view of a partial structure is shown, in which the top cover of the locking device housing has been removed;

[0123] Figure 83 A schematic diagram of a handcart according to an embodiment of the present invention;

[0124] Figure 84 for Figure 83 The diagram shows a top view of the handcart, and also includes enlarged views of its partial structures.

[0125] Figure 85 For along Figure 83 A partial sectional view of the HH line in the image;

[0126] Figure 86 For along Figure 84 A partial sectional view of line II in the middle;

[0127] Figure 87 To show Figure 83 A schematic diagram of a partial structure of the lower frame of the handcart equipped with a locking device;

[0128] Figure 88 for Figure 87 A schematic diagram of a partial structure after the top cover has been removed;

[0129] Figure 89 for Figure 87 A schematic diagram of the locking device after the top cover has been removed;

[0130] Figure 90 For along Figure 87 A cross-sectional view of the JJ line in the image;

[0131] Figure 91 For along Figure 87 A cross-sectional view of the KK line in the image;

[0132] Figure 92 This is a schematic diagram of an engaging device according to another embodiment of the present invention;

[0133] Figure 93 A schematic diagram of a locking member according to another embodiment of the present invention;

[0134] Figure 94 For along Figure 92 A sectional view of the LL line in the diagram;

[0135] Figure 95 For along Figure 92 A cross-sectional view of the MM line in the diagram;

[0136] Figure 96 To show Figure 83 A schematic diagram of a partial structure of a handcart with a shelf attached;

[0137] Figure 97 for Figure 96 A diagram illustrating a section of the structure after the riders removed the storage rack;

[0138] Figure 98 for Figure 96A schematic diagram of a partial structure of the shelving unit;

[0139] Figure 99 A schematic diagram of a handcart according to another embodiment of the present invention;

[0140] Figure 100 for Figure 99 A magnified view of region T in the image;

[0141] Figure 101 for Figure 100 A cross-sectional view of the PP line in the image;

[0142] Figure 102 for Figure 100 A cross-sectional view of the QQ line in the image;

[0143] Figure 103 This is a schematic diagram of a handcart according to another embodiment of the present invention, and an enlarged view of a partial structure is shown;

[0144] Figure 104 for Figure 103 The diagram shows a top view of the handcart, and also includes enlarged views of its partial structures.

[0145] Figure 105 For along Figure 103 A partial sectional view of the RR line in the diagram;

[0146] Figure 106 For along Figure 104 A partial sectional view of the SS line in the diagram.

[0147] Explanation of reference numerals in the attached figures:

[0148] 100. Handcart;

[0149] 1000, chassis;

[0150] 1100. Upper frame; 1110. Outer frame of upper frame; 1111. Upper slide groove; 1120. Longitudinal rod; 1131. First transverse rod; 1132. Second transverse rod; 1140. Limiting component; 1141. Limiting groove;

[0151] 1200, Lower frame; 1210, Lower frame outer frame; 1211, Lower slide groove; 1221, First rotating shaft; 1222, Second rotating shaft; 1230, Locking device fixing rod; 1240, Traction component fixing seat;

[0152] 1300, Support mechanism; 1310, First support; 1311, First support rod; 1312, Second support rod; 1320, Second support; 1321, Third support rod; 1322, Fourth support rod; 1331, First fixing rod; 1332, Second fixing rod; 1333, Third fixing rod; 1334, Fourth fixing rod; 1335, Fifth fixing rod; 1340, Drive rod; 1350, Bearing;

[0153] 1400, Lifting adjustment component; 1410, Sliding sleeve; 1420, First traction component; 1430, Sliding locking component; 1431, Engaging tooth; 1440, First driving component; 1441, First driving groove; 1450, First fixing pin; 1460, First elastic component; 1470, Lifting adjustment component housing;

[0154] 1500, Lifting and Adjusting Release Component; 1510, Second Drive Inclined Slot; 1520, First Traction Component Connector; 1530, Second Fixing Pin;

[0155] 1600, Supporting Platform;

[0156] 1700, handle; 1710, fifth elastic component;

[0157] 1800, pneumatic strut;

[0158] 2000, Engaging device; 2010, Engaging locking element; 2011, Locking hook; 2020, Release retaining element; 2021, Drive groove; 2022, Fourth fixing pin; 2030, Drive block; 2031, Locking hole; 2040, Second elastic element; 2050, Stop element; 2060, Third elastic element; 2070, Fourth elastic element; 2080, Engaging device housing;

[0159] 2100, Locking and releasing mechanism; 2110, Third drive slant groove; 2120, Second traction component; 2130, Second traction component connector; 2140, Third fixing pin;

[0160] 3000, Rider; 3010, Putter; 3011, Upper Putter; 3012, Lower Putter; 3013, Pole Cover; 3020, Grip;

[0161] 3100, crossbar; 3110, slider; 3120, fixing cover;

[0162] 3200, connecting rod;

[0163] 3300, base plate; 3310, guide groove; 3320, outer cover;

[0164] 3400, Driver deployment locking device; 3410, Inner cover; 3411, Front vertical groove; 3412, Rear vertical groove; 3420, Engaging component; 3430, Second drive component; 3431, Front drive slant groove; 3432, Rear drive slant groove; 3441, Front retaining pin; 3442, Rear retaining pin; 3451, Front elastic element; 3452, Rear elastic element;

[0165] 3500, Driver's retraction control; 3510, Third traction component; 3511, Traction component fixing pin;

[0166] 4000, Trailer;

[0167] 5100, Top cover; 5110, Foam material layer; 5120, Seat fabric layer; 5200, Bottom cover; 5300, Side panel;

[0168] 200. Portable vehicle; 210. Motion bar;

[0169] 300. Vehicle seat; 310. Seat surface;

[0170] H1, first altitude; H2, second altitude;

[0171] 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;

[0172] 600. Handcart;

[0173] 6000, chassis;

[0174] 6100, Upper frame; 6110, Outer frame of upper frame; 6120, Upper longitudinal rod; 6130, Transverse rod; 6140, First fixing seat; 6150, Second fixing seat; 6160, Third fixing seat;

[0175] 6200, Lower frame; 6210, Lower longitudinal rod; 6210a, First lower longitudinal rod; 6211a, First guide groove; 6210b, Second lower longitudinal rod; 6211b, Second guide groove; 6220, First pivot; 6230, Sleeve; 6230a, First sleeve; 6230b, Second sleeve; 6240, Second pivot;

[0176] 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;

[0177] 6400, Lifting adjustment component; 6410, Sliding sleeve; 6420, Sliding locking component; 6430, First driving component; 6431, Second driving groove; 6440, Second driving component; 6450, First fixing pin; 6460, First elastic component; 6470, Third rotating shaft;

[0178] 6500, Lifting and Adjusting Release Component; 6510, First Traction Component; 6520, First Mounting Base; 6521, First Guide Groove; 6530, Lifting and Adjusting Release Button; 6531, First Drive Inclined Groove;

[0179] 6600, Limiting rod; 6610, Screw; 6620, Screw sleeve; 6630, Extension rod; 6640, Rod cap;

[0180] 6700, Operating handle; 6710, Operating handle connector;

[0181] 6800, carrier platform;

[0182] 6900, driver;

[0183] h1, first altitude; h2, second altitude;

[0184] 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;

[0185] 7000, Engaging device; 7010, Engaging locking element; 7011, Locking hook; 7012, Pivoting hole; 7013, Fixing hole; 7014, Locking hole; 7020, Release retaining element; 7021, Fourth drive inclined groove; 7030, Sleeve; 7031, Third guide groove; 7040, Tension spring; 7050, Mounting plate; 7051, Fourth rotating shaft; 7060, Stop element; 7061, Fourth fixing pin; 7062, Second elastic element; 7063, Third elastic element; 7070, Holding drive element; 7071, Fifth fixing pin; 7072, Receiving cavity; 7073, Long slot hole; 7080, Engaging device housing;

[0186] 7100, Locking and releasing mechanism; 7110, Second traction component; 7120, Second mounting base; 7121, Second guide groove; 7130, Locking and releasing button; 7131, Third drive inclined groove; 7140, Second fixing pin; 7150, Traction component connector;

[0187] 700. Portable vehicle; 710. Lever;

[0188] 800. Handcart;

[0189] 8100, Lower frame; 8110, Longitudinal member; 8120, Outer member;

[0190] 8200, Driver; 8210, Upper support rod; 8220, Lower support rod;

[0191] 8300, Support member; 8310, First member; 8311, Intermediate pivot point; 8320, Second member; 8330, Third member; 8340, Intermediate connector;

[0192] 8400, locking device;

[0193] 8500, Locking and releasing mechanism; 8510, Traction component; 8520, Locking and releasing mechanism housing; 8521, Guide groove; 8530, Locking and releasing button; 8531, Drive slant groove; 8540, Fixing pin;

[0194] 8600, Anti-pinch component; 8610, Fifth pivot; 8620, Torsion spring;

[0195] 8700, carrier platform;

[0196] 8800, Locking and releasing mechanism; 8810, Towing mechanism; 8820, Locking and releasing lever; 8821, Operating unit; 8822, Connecting unit; 8830, Mounting block;

[0197] 900. Handcart;

[0198] 9100, Lower frame; 9110, Fixing rod; 9111, First limiting groove; 9112, Second limiting groove; 9120, Outer rod; 9130, Inner frame;

[0199] 9200, Rider; 9210, Pushrod; 9220, Grip; 9230, Mount; 9231, Engagement Slot;

[0200] 9300, Engaging device; 9310, Engaging device housing; 9311, Upper cover; 9312, Lower cover; 9320, Engaging locking element; 9321, Locking hook; 9322, Locking hole; 9323, Slot; 9330, Release retaining element; 9340, Sleeve; 9350, Stop element; 9360, Retaining drive element; 9370, First drive block; 9371, Limiting hole; 9372, Clearance hole; 9380, Second drive block; 9381, Connecting rod; 9382, Insert plate; 9390, First elastic element;

[0201] 9400, Locking and releasing mechanism; 9410, Traction component; 9420, Locking and releasing push button; 9430, Linkage component; 9431, Drive slant groove; 9440, Mounting base; 9441, Guide groove; 9450, Connecting component;

[0202] 9500, Shelf; 9510, Receiving cavity; 9511, Clamping part; 9520, Locking seat; 9521, Elastic part;

[0203] 9600, Support component; 9610, First rod; 9620, Second rod; 9621, Sliding groove;

[0204] 9700, locking and releasing mechanism; 9710, traction mechanism; 9720, locking and releasing handle; 9730, fixing pin;

[0205] 9800, Locking and release mechanism; 9810, Towing mechanism; 9811, Towing mechanism sleeve; 9820, Locking and release pedal; 9821, Pedal section; 9822, Connecting section; 9830, Mounting base; 9831, Pivot shaft;

[0206] D1, first direction; D2, second direction. Detailed Implementation

[0207] In the following description, various aspects of the invention will be described. Specific details are set forth for purposes of explanation in order to provide a thorough understanding of the invention. It will be apparent to those skilled in the art that other embodiments of the invention differ in detail without affecting its essence. Therefore, the invention is not limited to what is shown in the drawings and described in the specification, but only as indicated in the appended claims, and the appropriate scope of the invention shall be determined only by the broadest interpretation of the claims.

[0208] When a feature or element is referred to herein as "on another feature or element," it may be directly on the other feature or element, or there may be intermediate features and / or elements present. Conversely, when a feature or element is referred to herein as "directly" on another feature or element, there are no intermediate features or elements present. It should also be understood that when a feature or element is referred to herein as "connected," "attached," or "joined" to another feature or element, it may be directly connected, attached, or joined to the other feature or element, or there may be intermediate features or elements present. Conversely, when a feature or element is referred to herein as "directly connected," "directly attached," or "directly joined" to another feature or element, there are no intermediate features or elements present.

[0209] Spatial terms such as “below,” “under,” “above,” and “over” are used herein for descriptive purposes, particularly to describe the positional relationship between one feature or element and another, as shown in the figures. It should be understood that spatial terms are intended to include different orientations of the device in use or operation, in addition to those shown in the figures. For example, if the device in the figure is inverted, a feature or element described herein as “below” other features or elements would be oriented “above” other features or elements. Thus, the exemplary term “below” can include both above and below orientations. The device may also be oriented otherwise (rotated 90 degrees or in other directions), and the spatially related descriptions used herein are interpreted accordingly. Similarly, unless otherwise specified, terms such as “up,” “down,” “vertical,” and “horizontal” used herein are for illustrative purposes only.

[0210] While the terms “first” and “second” may be used herein to describe various features or elements, these features or elements should not be limited by these terms unless otherwise specified. These terms are used to distinguish one feature or element from another. Therefore, a first feature or element discussed below may be referred to as a second feature or element, and similarly, a second feature or element discussed below may be referred to as a first feature or element. In this document, “multiple” means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0211] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "front," "rear," "left," and "right" used in this document to refer to the handcart are based on the directions shown in the accompanying drawings. In the drawings, arrows L and R schematically indicate the "left" and "right" directions, and arrows F and B schematically indicate the "front" and "rear" directions. For example, "front" indicates the direction the handcart faces when moving forward, "rear" indicates the direction the handcart is moving away from when moving forward, "left" indicates "left" when viewed from the rear of the handcart, and "right" indicates "right" when viewed from the rear of the handcart. Other directional terms involving "front," "rear," "left," and "right" mentioned in this document have similar meanings. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0212] One aspect of the invention provides a handcart with a liftable frame.

[0213] Figure 1 A handcart 100 according to an embodiment of the present invention is shown. 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 bottom of the frame 1000 is provided with a plurality of rollable wheels, such as casters. 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 positioned in any suitable location. A support platform 1600 is provided on the top of the frame 1000, the support platform 1600 being used to support a portable carrier 200 (see reference 1). Figure 2 A locking device 2000 is also provided on the 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. The portable carrier 200 includes infant carriers, baby sleeping boxes, pet carriers, pet sleeping boxes, etc., used to carry infants or pets. Depending on the carrier mounted on it, the stroller 100 can be used as an infant stroller or a pet stroller. It is understood that the support platform 1600 can also be used to carry goods; in this case, the stroller 100 serves as a goods stroller for carrying goods.

[0214] The frame 1000 is height-adjustable, allowing it to switch between an extended and retracted state. Furthermore, when the frame 1000 is in the extended state, it can be adjusted to multiple heights. (See reference...) Figures 3A to 3C ,exist Figure 3A and Figure 3B In the middle, the frame 1000 is in the unfolded state, while... Figure 3CIn the folded state, the frame 1000 is in the unfolded state. When the frame 1000 is in the unfolded state, it can be adjusted to one of several heights as needed, to facilitate, for example, the user mounting or detaching the portable vehicle 200 from the support platform 1600, or, with the portable vehicle 200 on the support platform 1600, carrying an infant or pet into or out of the portable vehicle 200. For example, see reference... Figure 3A The frame 1000 has a first height H1. In this document, the height of the frame 1000 means the distance between the top surface of the frame 1000 (i.e., the surface where the support 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 can be lowered to a height such as... Figure 3B The second height H2 is shown. The frame 1000 is moved from... Figure 3A The first height H1 shown is adjusted to Figure 3B When the second height H2 is shown, the height of the support platform 1600 will decrease; conversely, the height of the frame 1000 will decrease. Figure 3B The second height H2 shown is adjusted to Figure 3A At the first height H1 shown, the height of the support platform 1600 will rise. It can be understood that when the frame 1000 is adjusted to its lowest height, the frame 1000 is in a retracted state, such as... Figure 3C As shown.

[0215] Reference Figure 4 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. The support mechanism 1300 is an X-shaped support mechanism, comprising a first support 1310 and a second support 1320 pivotally connected to each other. Pivoting of the first support 1310 and the second support 1320 relative to each other raises or lowers the upper frame 1100. For example, when the first support 1310 and the second support 1320 pivot relative to each other such that the front ends of the first support 1310 and the second support 1320 are relatively far apart, the upper frame 1100 is raised; when the first support 1310 and the second support 1320 pivot relative to each other such that the front ends of the first support 1310 and the front ends of the second support 1320 are relatively close to each other, the upper frame 1100 is lowered.

[0216] The frame 1000 also includes a height adjustment member 1400 and a height adjustment release member 1500, which will be described in detail below. The height adjustment member 1400 is switchable between a locked state and an unlocked state. When the height adjustment member 1400 is in the locked state, it prevents the first support 1310 and the second support 1320 from pivoting relative to each other. When the height adjustment member 1400 is in the unlocked state, it allows the first support 1310 and the second support 1320 to pivot relative to each other. Because the height adjustment member has a locking function, it can also be referred to as a "height adjustment member locking member". The height adjustment release member 1500 is configured to operate to switch the height adjustment member 1400 from the locked state to the unlocked state.

[0217] 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 this embodiment, the bracket mechanism has a bilaterally symmetrical structure, which will be described below. Figure 4 The description will be based on one side shown, and the other side has the same structure, so it will not be described again.

[0218] exist Figure 4 The diagram schematically illustrates 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 of the support mechanism pivot during the lifting and lowering of the frame 1000. The first support 1310 and the second support 1320 are pivotally connected to the first pivot point P1. The rear end of the first support 1310 is pivotally connected to the lower frame 1200 at the second pivot point P2, and the rear end of the second support 1320 is pivotally connected to the upper frame 1100 at the fourth pivot point P4. During the lifting and lowering of the frame 1000, the position of the second pivot point P2 within the lower frame 1200 remains unchanged, and the position of the fourth pivot point P4 within the upper frame 1100 also remains unchanged. In other words, during the lifting and lowering of the frame 1000, the rear end of the first support 1310 pivots only around the second pivot point P2 and does not shift relative to the lower frame 1200. Furthermore, the rear end of the second support 1320 pivots only around the fourth pivot point P4 and does not shift relative to the upper frame 1100.

[0219] The third pivot point P3 around which the front end of the first support 1310 pivots is slidable along the upper frame 1100, and the fifth pivot point P5 around which the front end of the second support 1320 pivots is slidable along the lower frame 1200. During the ascent of the frame 1000, the third pivot point P3 slides from front to back along the upper frame 1100, and the fifth pivot point P5 slides from front to back along the lower frame 1200; during the descent of the frame 1000, the third pivot point P3 slides from back to front along the upper frame 1100, and the fifth pivot point P5 slides from back to front along the lower frame 1200. In other words, during the ascent and descent of the frame 1000, the front end of the first support 1310 pivots around the third pivot point P3 and slides along the upper frame 1100, and the front end of the second support 1320 pivots around the fifth pivot point P5 and slides along the lower frame 1200. By sliding 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 by pivoting the first bracket 1310 and the second bracket 1320 around their respective pivot points, the support mechanism 1300 can be raised and lowered, that is, the upper frame 1100 and the support platform 1600 set on the upper frame 1100 can be raised and lowered. Therefore, the user can adjust the height of the support platform 1600 as needed.

[0220] In this embodiment, the frame 1000 also includes a handle 1700, which is disposed on the upper frame 1100. 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. Furthermore, the frame 1000 also includes a pneumatic strut 1800, which assists in the deployment of the support mechanism 1300, making it easier for the user to raise the upper frame 1100. In this embodiment, one end of the pneumatic strut 1800 is pivotally connected to the front end of the lower frame 1200, and the other end is pivotally connected to the first support 1310. In other embodiments, the pneumatic rod 1800 can be configured 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. Alternatively, the pneumatic rod 1800 can be positioned between the upper frame 1100 and the first bracket 1310, or between the upper frame 1100 and the second bracket 1320. It is understood that although only one pneumatic rod 1800 is provided in this embodiment, multiple pneumatic rods 1800 can be provided as needed in other embodiments.

[0221] Reference Figure 5The first support 1310 includes a first support rod 1311 and a second support rod 1312 that are parallel to each other, and the second support 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 approximately their respective centers along their length, and the second support rod 1312 and the fourth support rod 1322 are pivotally connected to each other at their respective centers along their length. In this embodiment, the third support rod 1321 and the fourth support rod 1322 are located outside the first support rod 1311 and the second support rod 1312, respectively. In other embodiments, the third support rod 1321 and the fourth support rod 1322 may also be located inside the first support rod 1311 and the second support rod 1312, respectively. A plurality of fixed rods are connected between the first support rod 1311 and the second support rod 1312, and a plurality of fixed 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 located near the front and rear ends of the first bracket 1310, respectively, and the fourth fixing rod 1334 and the fifth fixing rod 1335 are located near the front and rear ends of the second bracket 1320, respectively. The first fixing rod 1331 is located at the front of the first bracket 1310 and near the center of the first bracket 1310 in the length direction, that is, at the position where the first bracket 1310 and the second bracket 1320 are pivotally connected. The first fixing rod 1331 is connected to the other end of the pneumatic rod 1800.

[0222] The support mechanism 1300 also includes a drive rod 1340, which 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 connected to two bearings 1350. The two bearings 1350 are 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 support 1310 to pivot relative to the second support 1320. In this embodiment, the lifting adjustment member 1400 and the lifting adjustment release 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.

[0223] Continue to refer to Figure 5 The upper frame 1100 includes a longitudinal rod 1120 extending in its front-rear direction, and a 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 passes 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 longitudinally between the front and rear ends of the upper frame 1100 at 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. 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. It is understood that in other embodiments, only one lifting adjustment release member 1500 may be provided.

[0224] Upper sliding grooves 1111 are respectively provided on the opposite inner sides of the outer frame 1110 of the upper frame, and the two ends of the drive rod 1340 are adapted to slide in the upper sliding grooves 1111 respectively. In particular, 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 has 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. Continue to refer to Figure 5 and combined Figure 6One end of the drive rod 1340 passes through the front end of the second support rod 1312 and connects to the bearing 1350. An upper sliding groove 1111 is provided on the front part of the side wall of the outer frame 1110 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. Through the sliding and rolling of the bearing 1350 in the upper sliding 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.

[0225] Continue to refer to Figure 5 and combined Figure 7 The lower frame 1200 includes a generally rectangular lower frame outer frame 1210. Sliding grooves 1211 are respectively provided on opposite inner sides of the lower frame outer frame 1210. Specifically, the sliding grooves 1211 are located at the front of the lower frame outer frame 1210. As mentioned earlier, the support mechanism has a bilaterally 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.

[0226] The rear end of the first support rod 1311 is pivotally connected to the lower frame outer frame 1210 via a 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 displace relative to the lower frame 1200. As mentioned earlier, the support mechanism is a bilaterally symmetrical structure, and the rear end of the second support rod 1312 has the same construction as the rear end of the first support rod 1311, which will not be described again.

[0227] Continue to refer to Figure 5 and combined Figure 8 and Figure 9The upper frame 1100 also 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 generally correspond to the positions of the upper sliding groove 1111 in the front-rear direction of the upper frame 1100.

[0228] Continue to refer to Figure 5 and combined Figure 10 and Figure 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.

[0229] Reference Figure 12The lifting adjustment component 1400 includes a lifting adjustment component housing 1470 connected to the sliding sleeve 1410, and a sliding locking component 1430, a first driving component 1440, a first fixing pin 1450, and a first elastic component 1460 disposed between the lifting adjustment component housing 1470 and the sliding sleeve 1410. The sliding locking component 1430 is configured to selectively engage or disengage from the limiting component 1140. Figure 13A The slide locking member 1430 is shown engaging with the limiting member 1140. Figure 13B The slide lock 1430 is shown disengaged from the limit member 1140. When the slide lock 1430 engages with the limit member 1140, the lifting adjustment member 1400 is locked, preventing the sliding sleeve 1410 from sliding relative to the limit 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 slide lock 1430 disengages from the limit member 1140, the lifting adjustment member 1400 is unlocked, allowing the sliding sleeve 1410 to slide relative to the limit 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.

[0230] The top of the sliding locking member 1430 is provided with a predetermined number of engaging teeth 1431. These engaging teeth 1431 are adapted to selectively engage with a corresponding number of 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, the top of the sliding locking member 1430 is provided with five engaging teeth 1431. In other embodiments, the top of the sliding locking member 1430 may have only one engaging tooth 1431, or any other suitable number of engaging teeth 1431. When the engaging tooth 1431 engages with the limiting groove 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. Conversely, when the engaging tooth 1431 engages with the limiting groove 1141 further away 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. In other words, by selectively engaging the engaging tooth 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 in different positions along the limiting member 1140, the first bracket 1310 is at different pivot angles relative to the second bracket 1320, and correspondingly, the upper frame 1100 is at different heights relative to the lower frame 1200.

[0231] Continue to refer to Figure 12 and combined Figure 14 , Figure 15A and Figure 15BFor ease of explanation, some details have been omitted from these diagrams. Figure 10 The upper frame components are shown. A sliding locking member 1430 is connected to a first driving member 1440 via a first fixing pin 1450. First driving grooves 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 slidably connected to the first driving grooves 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 can be a wave spring, torsion spring, or any other suitable type of spring. Similarly, other elastic members mentioned herein can also be helical compression springs, wave springs, torsion springs, or any other suitable type of spring, and will not be described further.

[0232] The first end of the first traction member 1420 passes through the sliding sleeve 1410 and connects 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, driven by the first driving groove 1441, the sliding locking member 1430 moves downward with the first fixing pin 1450, 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 a position where... Figure 15A The disengagement position is shown. When the pulling force of the first traction member 1420 on the first driving member 1440 is removed, the sliding locking member 1430 moves upward under the elastic restoring force of the first elastic member 1460. At this time, the first fixing pin 1450 moves upward with the sliding locking member 1430, and the first driving member 1440 moves forward under the action of the first fixing pin 1450. The sliding locking member 1430 will move upward to the position shown. Figure 15B The shown joint position.

[0233] The second end of the first traction member 1420 is connected to the lifting adjustment and release member 1500 via the first traction member connector 1520. By operating the lifting adjustment and release member 1500, the first traction member 1420 can be pulled, thereby pulling the first drive member 1440. Specifically, refer to... Figure 14The lifting adjustment and release member 1500 has second drive grooves 1510 on opposite sides. A second fixing pin 1530 passes through the first traction member connector 1520, and both ends of the second fixing pin 1530 are slidably connected to the second drive grooves 1510 on opposite sides of the lifting adjustment and release member 1500. When the lifting adjustment and release member 1500 is pressed to move it, the first traction member connector 1520 moves forward under the drive of the second drive grooves 1510, thereby pulling the first traction member 1420. When the pressing of the lifting adjustment and release member 1500 is released, the lifting adjustment and release member 1500 can return to its initial position under the elastic restoring force of, for example, an elastic member (not shown).

[0234] It is understood that the structure and operation of the lifting adjustment release member 1500 and the first traction member 1420 described above are merely illustrative examples. The present invention is not limited thereto, and those skilled in the art can use any other suitable method to realize the control of the lifting adjustment member 1400 by the lifting adjustment member 1500.

[0235] According to the trolley 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 bracket 1310 and the second bracket 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.

[0236] Another aspect of the invention provides a handcart having a locking device for locking a portable vehicle.

[0237] Back 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 being adapted to support a portable carrier 200. The trolley 100 also includes a locking device 2000 disposed on top of the frame 1000, the locking device 2000 being used to secure the portable carrier 200 when it is supported on the support platform 1600.

[0238] Reference Figure 16The portable carrier 200 has a locking lever 210 at its bottom. 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-releasing element 2100, which can be operated to release the locking device 2000 from engaging the locking lever 210 of the portable carrier 200. Both the locking device 2000 and the locking-releasing element 2100 are located on the upper frame 1100 of the frame 1000. Figure 17 The upper frame 1100, on which the portable vehicle 200 is mounted, is shown schematically.

[0239] Reference Figures 18A to 18D The engaging device 2000 includes an engaging locking member 2010, a drive block 2030, and an engaging device housing 2080. The engaging locking member 2010 is movable between a locked position and an unlocked position. When the engaging locking member 2010 is in the locked position, it is adapted to secure the portable carrier 200 supported on the support platform 1600, and when the engaging locking member 2010 is in the unlocked position, it is adapted to release the securement of the portable carrier 200 to remove the portable carrier 200 from the support platform 1600.

[0240] Figure 18A The locking element 2010 is shown in the locked position. Figure 18C The locking element 2010 is shown in the unlocked position. The locking element 2010 has a locking hook 2011. Figure 18A In this configuration, the locking hook 2011 engages with the lever 210 located at the bottom of the portable carrier 200, thereby securing the portable carrier 200 to the support platform 1600. 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, see reference... Figure 18A and 18C When the locking / unlocking mechanism 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 being 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.

[0241] Reference Figure 19The handcart 100 also includes a second traction member 2120, the first end of which is connected to the drive block 2030, and the second end of which is connected to the 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.

[0242] Reference 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 drive 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 drive 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 drive grooves 2110, thereby pulling the second traction member 2120. When the pressing of the locking and releasing member 2100 is released, the locking and releasing member 2100 can return to its initial position under the elastic restoring force of, for example, an elastic member (not shown).

[0243] Back 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, which is connected to the drive block 2030, will move backward, thereby pulling the drive block 2030 backward. Driven by the drive block 2030, the locking / unlocking member 2010 also moves backward to move from the locked position to the unlocked position.

[0244] Continue to refer to Figures 18A to 18D The engaging device 2000 also includes a release retainer 2020. The release retainer 2020 is movable between an extended position and a retracted position. When the release retainer 2020 is in the extended position, its tip 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. Figure 18A , 18CWhen the lever 210 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. Figure 18D When the lever 210 shown is removed from the engaging device 2000, the release retainer 2020 returns from the retracted position to the extended position, so the top of the release retainer 2020 is visible.

[0245] 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 the locking member 2010 from moving from the release position to the locked position. When this force is released, and the release retainer 2020 moves from the retracted position to the extended position, it allows 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, it allows the locking member 2010 to move from the release position to the locked position. Figure 18A The locked position shown has been moved to Figure 18C The locking position is shown, but the locking member 2010 cannot move from the unlocked position to the locked position. Only when the lever 210 is removed from the engaging device 2000, causing the unlocking retainer 2020 to be in the extended position, can the locking member 2010 move from the unlocked position to the locked position. Figure 18D The locking position is shown. When the locking element 2010 is engaged... Figure 18D In the locked position shown, when the portable carrier 200 is again supported on the support platform 1600, the lever 210 will push the locking member 2010 to move 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, thus 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.

[0246] Continue to refer to Figure 18B and combined Figure 21A and 21BThe engaging device 2000 further includes a third elastic element 2060, which is adapted to bias the release retainer 2020 upward, allowing the tip 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 engaging device 2000 also includes a stop 2050 slidably disposed in the release retainer 2020, and a fourth elastic element 2070 disposed between the release retainer 2020 and the stop 2050. The fourth elastic element 2070 is adapted to bias the stop 2050 downward. The lower part of the stop 2050 extends from 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, and can also be called a "stop pin" or "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 can be provided as needed.

[0247] In this embodiment, when the release retainer 2020 is in the retracted position, the drive block 2030 is adapted to hold the engaging locking member 2010 in the release position. Specifically, when the release retainer 2020 is in the retracted position, the stop member 2050 is adapted to engage with the drive block 2030. When the drive block 2030 engages with the stop member 2050, the drive block 2030 prevents the engaging locking member 2010 from moving from the release position to the locked position.

[0248] 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, the locking member 2010 is driven by the drive block 2030 to... Figure 18A The locked position shown has been moved to Figure 18CIn the unlocked position shown, the locking hole 2031 is aligned with the stop 2050. The stop 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 is engaged 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 unlocked position. When the latch 210 moves out of the engaging 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 via the fourth fixing pin 2022, so that the bottom end of the stop 2050 is above the drive block 2030 and spaced apart from it. At this time, since the stop 2050 disengages from the locking hole 2031, the movement of the drive block 2030 is no longer hindered by the stop 2050. Therefore, under the elastic restoring force of the second elastic member 2040, the engaging locking member 2010 can push the drive block 2030, moving from the released position to the extended position. Figure 18C The lock position is shown.

[0249] 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 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 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 member 2010 will pop out again from the locking device housing 2080.

[0250] It is understood that the locking device structure proposed in this aspect can be applied to the handcart proposed in any aspect of the present invention.

[0251] Another aspect of the invention provides a handcart with a separately collapsible driver.

[0252] Reference Figures 22 to 24The handcart 100 includes a frame 1000 and a handlebar 3000 disposed on the frame 1000. A user can push the handcart 100 by gripping the handlebar 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 retracted state. The handlebar 3000 is pivotally connected to the lower frame 1200 and is pivotable relative to the frame 1000 between an extended and a retracted position. Figure 22 The driver 3000 is shown in the deployed position. Figure 24 The image shows the rider 3000 in the retracted position. Figure 23 The rider 3000 is shown between the extended and retracted positions (i.e., in the process of retracting or extending). 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 retraction or extension of the rider 3000 is not related to the retraction or extension of the frame 1000. After retracting the rider 3000 separately, the frame 1000 can be retracted to achieve the overall retraction of the trolley 100, or the frame 1000 can be retracted first, followed by the rider 3000, to achieve the overall retraction of the trolley 100. Figure 25 The diagram shows a trolley 100 in its fully folded state, with the handlebars 3000 and frame 1000 in the folded position. This invention does not restrict the order in which the handlebars 3000 and frame 1000 are folded; the handlebars 3000 can be folded first, followed by the frame 1000, or vice versa. Similarly, this invention does not restrict the order in which the handlebars 3000 and frame 1000 are unfolded.

[0253] like Figure 24 As shown, 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.

[0254] Reference Figure 26AThe 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, interference of the handle 1700 with the rider 3000 during the pivoting of the rider 3000 relative to the frame 1000 can be avoided by compressing the handle 1700. (Refer to...) Figure 26B The handle 1700 is slidably mounted on the upper frame 1100. A fifth elastic element 1710 is provided in the handle 1700, and the fifth elastic element 1710 is fixed to the upper frame 1100 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. 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 the present invention does not limit this.

[0255] Reference Figure 22 , Figure 27 and Figure 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, which are 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 opposite to each other. 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.

[0256] The trolley 100 also includes a base plate 3300 disposed at the bottom of the lower frame 1200. Guide grooves 3310 are respectively formed 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 can pass, 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 sliders 3110, the connecting rod 3200 can pivot relative to the sliders 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, so that the connecting rod 3200 can also pivot relative to the slider 3110.

[0257] exist Figure 22 and Figure 27 The diagram schematically illustrates 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 connecting rod 3200 pivot during the pivoting process of the rider 3000 relative to the frame 1000. 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, and 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 within the lower frame 1200 remains fixed, the seventh pivot point P7 rotates along an arc centered on the sixth pivot point P6, and the eighth pivot point P8 moves along the lower frame 1200. Specifically, when the rider 3000 pivots from the extended position to the retracted position, the eighth pivot point P8 moves from back to front along the lower frame 1200, and 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.

[0258] Reference Figures 28 to 30The trolley 100 also includes a driver deployment locking device 3400, which is disposed in the lower frame 1200, specifically extending downward through the base plate 3300. When the driver 3000 pivots to the deployed position, the crossbar 3100 can be locked by the driver deployment locking device 3400. Specifically, during the pivoting process of the driver 3000 from the folded position to the deployed position (i.e., from front to back), the driver 3000 drives the crossbar 3100 to move from front to back via the connecting rod 3200. Under the action of 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 time, the driver 3000 can no longer pivot backward and is in the deployed position, as shown in the image. Figure 29 As shown. In this configuration, the rider deployment locking device 3400 can lock the crossbar 3100, keeping the rider 3000 in the deployed position. (See reference...) 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.

[0259] During the pivoting process of the rider 3000 from the extended position to the retracted position (i.e., pivoting from back to front), the rider 3000 drives the crossbar 3100 to move from back to front via the connecting rod 3200. Driven by 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, it 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... Figure 30 As shown. (Refer to...) Figure 24 and Figure 25 When the rider 3000 is in the retracted position, the rider 3000 is roughly 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.

[0260] Reference Figures 31 to 33The trolley 100 also includes a handle retraction operation 3500, which is operable to release the handle extension locking device 3400 from locking the crossbar 3100. When the handle 3000 is locked in the extended position by the handle extension locking device 3400, to retract the handle 3000, the handle extension locking device 3400 must first be operated to release the lock on the crossbar 3100. In this embodiment, the handle retraction operation 3500 is disposed on the handle 3000. The handle 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 equipped with a rider retraction control 3500, which, through a third traction member 3510, allows the rider to deploy the locking device 3400. The following description uses the rider retraction control 3500 located on one of the push rods 3010 as an example; the other push rod 3010 has the same structure and will not be described further.

[0261] 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. The rider retraction operation member 3500 can be operated to move upward relative to the upper push rod 3011. Figure 33 The left image shows the rider retracting the 3500 control unit without it being operated. Figure 33 The right figure shows the operated rider retraction control 3500. When the rider retraction control 3500 is pulled upward, it will cause the first end of the third traction member 3510 to move upward.

[0262] 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 a 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 a locking device fixing rod 1230. Figure 31 In the middle, the towing component 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.

[0263] Reference 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 movement of the crossbar 3100 along the lower frame 1200 in the fore-and-aft 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 movement of the crossbar 3100 along the lower frame 1200 in the fore-and-aft 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... Figure 35 As shown, 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 so 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.

[0264] The inner cover 3410 has a front vertical groove 3411 and a rear vertical groove 3412 on opposite sides, and the second drive member 3430 has a front drive inclined groove 3431 and a rear drive 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 drive inclined groove 3431 in sequence, and are slidable along the front vertical groove 3411 and the front drive inclined groove 3431. The two ends of the rear fixing pin 3442 pass through the rear vertical groove 3412 and the rear drive inclined groove 3432 in sequence, and are slidable along the rear vertical groove 3412 and the rear drive 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.

[0265] Combination Figure 39A and Figure 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 inclined groove 3431 and the rear driving inclined 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 a position where... Figure 39B The release position is shown. When the pulling force of the third traction member 3510 on the second driving member 3430 is removed, 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 position shown. Figure 39A The lock position is shown.

[0266] According to the trolley 100 of this invention, the folding or unfolding of the rider 3000 is not related to 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.

[0267] It is understood that the driver-related mechanism proposed in this aspect can be applied to the handcart proposed in any aspect of this invention.

[0268] Another aspect of the invention provides a handcart with a trolley.

[0269] Reference Figures 40 to 44 The handcart 100 includes a frame 1000 and a handlebar 3000 disposed on the frame 1000. A user can push the handcart 100 by gripping the handlebar 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. The upper frame 1100 is adjustable in height relative to the lower frame 1200 by pivoting between the components of the support mechanism. The upper frame 1100 is adapted to carry a portable carrier 200. The handcart 100 also includes a tray 4000 connected to the upper frame 1100 and switchable between a folded and an unfolded state. When the tray 4000 is in the unfolded state, at least a portion of the tray 4000 is located in front of the upper frame 1100, and this portion of the tray 4000 in front of the upper frame 1100 is adapted to carry the portable carrier 200.

[0270] Specifically, such as Figure 40 and Figure 41 As shown, 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 (e.g., Figure 40 As shown), the slide 4000 is located below the upper frame 1100, and when the slide 4000 is in the unfolded state, the slide 4000 is basically flush with the upper frame 1100 (as shown). Figure 41 (As shown). In this embodiment, the state switching between the retracted and extended states of the slide 4000 is achieved by pivoting the slide 4000 relative to the upper frame 1100. The pivot connection between the slide 4000 and the upper frame 1100 can be implemented in any suitable manner known in the art, and the present invention does not limit this.

[0271] Reference Figure 42When the tray 4000 is in the unfolded state, it can be placed on the seat surface 310 of the vehicle seat 300, making it convenient for the user to push the portable carrier 200, which is supported by 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, which is loaded on the trolley 100, onto the vehicle seat 300, the user can unfold the tray 4000 and move the trolley 100 to the front or side of the vehicle seat 300. By adjusting the height of the frame 1000 so that the tray 4000 can be placed precisely on the seat surface 310 of the vehicle seat 300, the user can use the transition between the upper frame 1100 and the seat surface 310 of the vehicle seat 300 to push the portable carrier 200, which is supported by the upper frame 1100, directly into the vehicle seat 300, thus saving effort.

[0272] Reference Figure 43 and Figure 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 retracts into the upper frame 1100 (e.g., Figure 43 (As shown). When the slide 4000 is in the unfolded 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 unfolded state.

[0273] In other embodiments, the tray 4000 can be detachably attached 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.

[0274] 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.

[0275] It is understood that the slide-related structure proposed in this aspect can be applied to the handcart proposed in any aspect of the present invention, and the slide can also be designed to be detachable.

[0276] Another aspect of the invention provides a handcart with side panels.

[0277] Reference Figure 45 The handcart 100 includes a frame 1000, which includes 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 1000 described in any aspect of the present invention.

[0278] Reference Figure 46 and Figure 47 The stroller 100 also 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. The side panels 5300 are detachably connected to the upper cover 5100. Specifically, the top of the side panels 5300 is detachably connected to the upper cover 5100. The bottom end of the side panel 5300 may be either not connected to the lower cover 5200 or may be detachably connected to the lower cover 5200. When the bottom end of the side panel 5300 is not connected to the lower cover 5200, the bottom end of the side panel 5300 at least reaches or at least partially covers the side wall of the lower cover 5200. This detachable connection allows the side panel 5300 to be easily removed from the trolley 100 for cleaning.

[0279] Reference Figure 48A and Figure 48B The upper 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 upper 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 pressing a foam body; 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 attached 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, also a structure with the foam material layer 5110 on the inner side and the seat fabric layer 5120 on the outer side.

[0280] 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 can also be connected to the top end of the side panel 5300 by detachable connectors such as buttons or snaps. Figure 46 As shown, in this embodiment, the side panel 5300 has an accordion-like 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.

[0281] The side panel 5300 can also be detachably connected to the seat fabric layer 5120 of the lower cover 5200. In particular, 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 connected in a manner similar to that 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.

[0282] 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.

[0283] In another embodiment, reference Figure 49 The side panel 5300 is made of elastic fabric. The elastic fabric is composed of elastic fibers such as spandex. Because the elastic fabric itself has significant stretchability, the side panel 5300 does not need a folding structure to accommodate the lifting and lowering of the frame 1000. With the use of elastic fabric, the appearance of the motorcycle body will be flatter when the frame 1000 is in the unfolded state.

[0284] 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.

[0285] According to the stroller 100 of this aspect, the frame 1000 is enclosed by the 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.

[0286] It is understood that the side panel-related structures proposed in this aspect can be applied to the handcart proposed in any aspect of the present invention.

[0287] Another aspect of the invention provides a handcart with a liftable frame.

[0288] Figure 50 A handcart 600 according to an embodiment of the present invention is shown. 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. (Refer to reference...) 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 rider 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 retracted position. Figure 50 The rider 6900 is shown in the deployed position. The rider 6900 can pivot relative to the upper frame 6100 to switch from the deployed position to the retracted position. When the rider 6900 is in the retracted position, refer to... Figure 52C The rider 6900 is roughly located on the side of the upper frame 6100.

[0289] 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.

[0290] 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 wheels being located at the front of the lower frame 6200 and the other pair of wheels being 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.

[0291] The frame 6000 can switch between an extended and a retracted state. When the frame 6000 is in the extended state, it can be adjusted to multiple heights. (See reference) Figures 52A to 52C ,exist Figure 52A and Figure 52B In the middle, the 6000 frame is in the unfolded state, while... Figure 52C In the middle, the frame 6000 is in the folded state. When the frame 6000 is in the unfolded state, it can be adjusted to one of several 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 is carrying the portable vehicle, the user taking an infant or pet into or out of the portable vehicle. For example, see reference... Figure 52A The frame 6000 has a first height h1. In this document, the height of the frame 6000 means 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, the frame 6000 can be lowered to a height such as... Figure 52B The second height h2 is shown. The frame 6000 is moved from... Figure 52A The first height h1 shown is adjusted to Figure 52B When the second height h2 is shown, the height of the support platform 6800 will decrease; conversely, the height of the frame 6000 will increase. Figure 52B The second height h2 shown is adjusted to Figure 52A At the first height h1 shown, the height of the support platform 6800 will rise. It can be understood that when the frame 6000 is adjusted to its lowest height, the frame 6000 is in a retracted state, such as... Figure 52C As shown.

[0292] 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 referred to as 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.

[0293] Back Figure 51The 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 centers along the length direction. 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 centers along the length direction. 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.

[0294] The pivoting of the first upper support 6311 relative to the second upper support 6312 will cause 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 cause 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 are relatively far apart, the first lower support 6321 and the second lower support 6322, driven by the first upper support 6311 and the second upper support 6312, pivot relative to each other such that the front end of the first lower support 6321 and the front end of the second lower support 6322 are relatively far apart, thereby raising the upper frame 6100. When the first upper support 6311 and the second upper support 6312 pivot relative to each other, causing the front end of the first upper support 6311 and the rear end of the second upper support 6312 to approach each other, the first lower support 6321 and the second lower support 6322 pivot relative to each other under the action of the first upper support 6311 and the second upper support 6312, causing the front end of the first lower support 6321 and the front end of the second lower support 6322 to approach each other, thereby lowering the upper frame 6100.

[0295] 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-shaped support mechanism 6310 and the second X-shaped support mechanism 6320 are similar to those of the support mechanism 1300 described in the above embodiment, and will not be repeated here.

[0296] 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.

[0297] Figure 53A for Figure 50 The diagram shows a partial structure of the handcart. Figure 53B for Figure 53A The diagram shows a partial structure of the handcart with the lower frame shell removed, viewed from another angle. Figure 53A and Figure 53BThe diagram schematically illustrates 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. 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 and the rear end of the second lower support 6322 are pivotally connected to the fifth pivot point p5, and the front end of the second upper support 6312 and the front end of the first lower support 6321 are pivotally connected to 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 remains unchanged, and the position of the seventh pivot point p7 in the lower frame 6200 remains unchanged. That is to say, during the lifting and lowering of the frame 6000, the front end of the first upper support 6311 pivots only around the first pivot point p1 without displacement relative to the upper frame 6100, and the front end of the second lower support 6322 pivots only around the seventh pivot point p7 without displacement relative to the lower frame 6200.

[0298] 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 ascent of the frame 6000, the second pivot point p2 will slide along the upper frame 6100 from rear to front (i.e., toward the first pivot point p1), and the eighth pivot point p8 will slide along the lower frame 6200 from rear to front (i.e., toward the seventh pivot point p7); during the descent 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.

[0299] Reference Figure 54The lower frame 6200 includes two parallel lower longitudinal rods 6210, namely, a first lower longitudinal rod 6210a and a second lower longitudinal rod 6210b. Both the first lower longitudinal rod 6210a and the second lower longitudinal rod 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 a first pivot 6220. Specifically, a third lower support rod 6322a is pivotally connected to the first lower longitudinal rod 6210a via the first pivot 6220, and a fourth lower support rod 6322b is pivotally connected to the second lower longitudinal rod 6210b via the first pivot 6220. A sleeve 6230 is fitted onto the rear of each lower longitudinal rod. Specifically, a first sleeve 6230a is fitted onto the rear of the first lower longitudinal rod 6210a, and a second sleeve 6230b is fitted onto the rear of the second lower longitudinal rod 6210b. 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, allowing the first sleeve 6230a to slide 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, allowing the second sleeve 6230b to slide 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 bracket 6321 are pivotally connected to the two sleeves 6230 via a 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.

[0300] 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 displacement of the rear end of the second upper bracket 6312 relative to the upper frame 6100 allows the first upper bracket 6311 and the second upper bracket 6312 to pivot relative to each other. 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.

[0301] Reference Figure 55A , Figure 55B and Figure 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 generally 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 mounted below the front portion of the two upper longitudinal bars 6120, and 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 fixed seat 6140 via a rotating shaft.

[0302] A second fixing seat 6150 and a third fixing seat 6160 are installed below the rear of the two upper longitudinal rods 6120. In this embodiment, 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 rivets 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; that is, the axis X1 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 X1. A lifting adjustment member 6400 is sleeved on the limiting rod 6600 and is movable relative to the limiting rod 6600 along the axis X1 of the limiting rod 6600. The lifting adjustment member 6400 can move linearly along the axial direction (i.e., the direction of axis X1) of the limiting rod 6600 through either a sliding engagement or a threaded engagement 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 member 6400 is in the locked state, it is threadedly engaged with the limiting rod 6600, and the sliding of the lifting adjustment member 6400 relative to the limiting rod 6600 in the axial direction is restricted, but movement of the lifting adjustment member 6400 in the axial direction of the limiting rod 6600 can be achieved by rotating the limiting rod 6600. When the lifting adjustment member 6400 is in the unlocked state, sliding of the lifting adjustment member 6400 relative to the limiting rod 6600 in the axial direction is permitted. 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 In the middle, the lifting adjustment component 6400 is in the first position, and in this first position, the front end of the lifting adjustment component 6400 is close to the second fixed seat 6150; in Figure 55B In the second position, the height adjustment member 6400 is located closer to the rear end of the upper frame 6100, where the rear end of the height adjustment member 6400 is close to the third fixing seat 6160. In these two cases, the frame 6000 has different heights. Specifically, in Figure 55A In the case shown, the distance between the front end of the first upper bracket 6311 and the rear end of the second upper bracket 6312 is less than that in the case shown. Figure 55BThe distance between the front end of the first upper bracket 6311 and the rear end of the second upper bracket 6312 in the illustrated case is such that 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 in... Figure 52A The first height h1 shown indicates that when the lifting adjustment component 6400 is in the second position, the frame 6000 is in the... Figure 52B The second height h2 is shown.

[0303] The frame 6000 also includes a height adjustment release member 6500. The height adjustment release member 6500 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, 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. The height adjustment release member 6500 is configured to be operable to switch the height adjustment member 6400 from a locked state to an unlocked state.

[0304] The frame 6000 also includes a first traction member 6510, with a first end connected to a lifting adjustment release member 6500 and a second end 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; conversely, 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, and each lifting adjustment release member 6500 is connected to the lifting adjustment member 6400 via a first traction member 6510 to operably switch the lifting adjustment member 6400 from a locked state to an unlocked state. In other embodiments, only one lifting adjustment release member 6500 may be provided, and the lifting adjustment release member 6500 may also be provided on the front or rear side of the upper frame 6100. To facilitate user operation, four lifting and adjusting release parts 6500 can also be provided, located on the front and rear sides and left and right sides of the upper frame 6100 respectively.

[0305] Reference Figure 57A and Figure 57BThe lifting adjustment and release mechanism 6500 includes a first mounting base 6520 and a lifting adjustment and 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 and release button 6530. First drive grooves 6531 are provided on opposite sides of the lifting adjustment and release button 6530. A first end of a first traction member 6510 is connected to a fixing pin (not shown in the figure) within the lifting adjustment and release button 6530. Both ends of the fixing pin protrude from the two first drive grooves 6531 located on opposite sides of the lifting adjustment and 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 under the drive of 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).

[0306] Reference Figure 58 , Figure 59A and Figure 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. Screw sleeves 6620 are respectively fitted onto the first end and the second end of the screw 6610, one of which is located between the first end of the screw 6610 and the through hole of the second fixed seat 6150, and the other is located between the second end of the screw 6610 and the through hole of the third fixed seat 6160. The screw sleeves 6620 allow for smoother rotation of the screw 6610 relative to the second fixed seat 6150 and the third fixed seat 6160.

[0307] 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 rivets. Under user operation, the operating handle 6700 can rotate around the axis X1 of the limiting rod 6600. Simultaneously, the operating handle 6700 can also rotate around its own axis X2. During the rotation of the operating handle 6700 around the axis X1 of the limiting rod 6600, the operating handle connector 6710 will rotate along with the operating handle 6700. Driven by the operating handle connector 6710, the limiting rod 6600 will rotate synchronously around its axis X1 with the operating handle connector 6710.

[0308] 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 detaching 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 detaching from the extension rod 6630.

[0309] The lifting adjustment member 6400 includes a sliding sleeve 6410 and a sliding locking member 6420 movably disposed within the sliding sleeve 6410. Third rotating shafts 6470 are 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 sleeved on 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 The sliding locking element 6420, which engages with the screw 6610, is shown. Figure 59B A sliding lock 6420 disengaged from screw 6610 is shown. When the sliding lock 6420 is engaged with screw 6610, the lifting adjustment member 6400 is locked, preventing the sliding sleeve 6410 from sliding relative to screw 6610, and correspondingly preventing the lifting adjustment member 6400 from sliding relative to limit rod 6600. When the sliding lock 6420 disengages from screw 6610, the lifting adjustment member 6400 is unlocked, allowing the sliding sleeve 6410 to slide relative to screw 6610, and correspondingly allowing the lifting adjustment member 6400 to slide relative to limit rod 6600. In this case, the sliding of the lifting adjustment member 6400 relative to limit rod 6600 allows the pivoting of the first upper bracket 6311 and the second upper bracket 6312 relative to each other, thereby enabling adjustment of the height of the frame 6000.

[0310] 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 axial locations of the screw 6610 to define the axial position of the sleeve 6410 relative to 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 abutting against 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 a certain height. Figure 52A The first height h1 is shown. 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 in place. Figure 52B The second height h2 is shown.

[0311] The lifting adjustment component 6400 also includes a first driving component 6430 and a second driving component 6440 movably disposed within the sliding sleeve 6410. The first driving component 6430 is movable relative to the sliding sleeve 6410 in the front-rear direction, and the second end of the first traction component 6510 is connected to the first driving component 6430. The second driving component 6440 is movable relative to the sliding sleeve 6410 in the vertical direction. A sliding locking component 6420 is fixed to the top of the second driving component 6440. In this embodiment, the sliding locking component 6420 is fixedly connected to the second driving component 6440 by a threaded fastener. In other embodiments, the sliding locking component 6420 can be fixed to the second driving component 6440 by a permanent connection method such as welding or bonding, or by a fastener such as a pin fastener or a rivet fastener, or it can be integrally formed with the second driving component 6440. The second driving component 6440 is connected to the first driving component 6430 by a first fixing pin 6450. A second driving groove 6431 is provided on both opposite sides of the first driving member 6430. A first fixing pin 6450 passes through the second driving member 6440, and both ends of the first fixing pin 6450 are slidably connected to the second driving grooves 6431 provided on both 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, a 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 described in detail.

[0312] 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 inclined 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 a position where... Figure 59BThe disengaged position is shown. When the press of the lifting adjustment release button 6530 is released, the first traction member 6510 no longer applies tension to the first driving member 6430, and 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 position of Figure 59A The shown joint position.

[0313] 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. The present invention is not limited thereto, and 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.

[0314] 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. In addition, even when the lifting adjustment member 6400 is in the locked state, the user can also move the rear end of the second upper bracket 6312 relative to the upper frame 6100 by operating the operating handle 6700, thereby changing the height of the frame 6000. For example, when the user rotates the operating handle 6700 about the axis X1 of the limiting rod 6600, the limiting rod 6600 will rotate synchronously with the operating handle 6700. Because the sliding locking member 6420 of the lifting adjustment member 6400 engages with the screw 6610 of the limiting rod 6600 in the unlocked state, 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. Rotation of the limiting rod 6600 in different directions (e.g., clockwise or counterclockwise) will cause the lifting adjustment member 6400 to move forward or backward, thereby raising or lowering the height of the frame 6000 accordingly.

[0315] Figure 60 A handcart 600 according to another embodiment of the present invention is shown, which is similar to the one described above. Figure 50 The difference in the illustrated embodiment lies in the arrangement of the rider 6900. In this embodiment, the rider 6900 is connected to the bottom of the lower frame 6200, rather than the upper frame 6100. Furthermore, in Figure 50 In the illustrated embodiment, the rider 6900 is located at the rear end of the upper frame 6100, while in this embodiment, the rider 6900 is located at the front end of the lower frame 6200. According to the rider 6900 configuration in this embodiment, the user can easily move the trolley 600 forward by pulling it.

[0316] 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.

[0317] Another aspect of the invention provides a trolley having a locking device for locking a portable vehicle.

[0318] Back 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.

[0319] Figure 61 A stroller 600 equipped with a portable carrier 700 is shown. 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. Figure 61 In the image, only the frame of the portable vehicle 700 is shown on the upper part, without showing any fabric that could cover the frame.

[0320] Reference Figure 62The portable carrier 700 has a locking lever 710 at its bottom. When the portable carrier 700 is supported on the support platform 6800, the locking device 7000 is adapted to engage the locking lever 710 to secure the portable carrier 700. The trolley 600 also includes a locking-releasing element 7100, which can be operated to release the locking device 7000 from engaging the locking lever 710 of the portable carrier 700. Both the locking device 7000 and the locking-releasing element 7100 are located on the upper frame 6100 of the frame 6000.

[0321] Reference Figure 63 The engaging device 7000 includes an engaging device housing 7080, and an engaging locking member 7010 and a release retainer 7020, both at least partially disposed within the engaging device housing 7080. The tips of the engaging locking member 7010 and the release retainer 7020 are adapted to extend from the engaging device housing 7080. The engaging locking member 7010 is movable between a locked position and an unlocked position. When the engaging locking member 7010 is in the locked position, it is adapted to secure a portable carrier 700 supported on a support platform 6800, and when the engaging locking member 7010 is in the unlocked position, it is adapted to release the securement of the portable carrier 700 to remove the portable carrier 700 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 release position and then restricts the locking member 7010 from moving from the release position to the locked position. When this force is released, 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 locked position.

[0322] Reference Figure 64A and Figure 64BThe locking / unlocking member 7100 is disposed on the outer wall of one side of the outer frame 6110 of the upper frame. In this embodiment, two locking / unlocking members 7100 are provided, which are respectively located on opposite sides (i.e., the left and right sides) of the outer wall of the outer frame 6110 of the upper frame. 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.

[0323] Reference Figure 65 , Figure 66A and Figure 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 two second drive grooves 7131 located on opposite sides of the locking / unlocking button 7130, respectively. After exiting the two third drive grooves 7131, both ends of the second fixing pin 7140 are slidably embedded in the two second guide grooves 7121 located on opposite sides of the second mounting base 7120. When the release button 7130 is pressed, the release button 7130 is moved to... Figure 66B When the position is shown, driven by the third drive groove 7131, the second fixing pin 7140 will move backward. 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 release button 7130 is released, the locking release button 7130 can return to its original position under the action of, for example, the elastic restoring force of the elastic member (not shown). Figure 66A The initial position is shown.

[0324] Figure 67 and Figure 68 The engaging device 7000, mounted on the upper frame 6100, is shown, wherein, for ease of explanation, in Figure 67 The top cover of the engaging device housing 7080 was removed in the middle. Figure 68 The upper and lower covers of the engaging device housing 7080 have been removed. The engaging device 7000 includes a sleeve 7030 and a mounting plate 7050, both of which are mounted on the upper longitudinal rods 6120 of the upper frame 6100. Specifically, the sleeve 7030 has protrusions extending in the lateral direction 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.

[0325] Combined with reference Figure 69 , Figure 70 , Figure 71A and Figure 72B The engaging locking member 7010 has a locking hook 7011, which is adapted to engage with a lever 710 disposed at the bottom of the portable carrier 700. The engaging locking member 7010 has a pivot hole 7012 through which a fourth pivot 7051 passes. The fourth pivot 7051 is fixed to a mounting plate 7050. The locking hook 7011 is pivotable about the fourth pivot 7051 to engage or disengage the locking hook 7011 from the lever 710. The second end of the second traction member 7110 is connected to the other end of the engaging locking member 7010 opposite to the locking hook 7011. When the locking and unlocking 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 that can engage with the lever 710 (i.e., the locked position of the locking member 7010) to a position that can disengage from the lever 710 (i.e., the unlocked position of the locking member 7010). Figure 71A and Figure 71BThe engaging locking member 7010 is shown in both the locked and unlocked positions. The second end of the second traction member 7110 is connected to the engaging locking member 7010 via a retaining pin (not shown). The engaging locking member 7010 has a retaining hole 7013 through which the retaining pin passes. The engaging 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 engaging locking member 7010, allowing the engaging locking member 7010 to automatically return from the unlocked position to the locked position. For example, when the engaging locking member 7010 is in the disengaged position, when the tension force applied to the engaging locking member 7010 by the second traction member 7110 is removed, the engaging locking member 7010 can pivot from the unlocked position to the locked position under the elastic restoring force of the tension spring 7040.

[0326] The engaging device 7000 further includes a retaining drive member 7070 and a stop member 7060 slidable relative to the retaining drive member 7070. The engaging locking member 7010 is provided with a stop engagement member adapted to engage with the stop member 7060. In this embodiment, the stop engagement member is a locking hole 7014. The stop member 7060 can be inserted into the locking hole 7014. When the stop member 7060 is inserted into the locking hole 7014, the engaging locking member 7010 cannot pivot, that is, the locking hook 7011 cannot pivot about the fourth pivot 7051. The retaining drive member 7070 is embedded in and slidable within the sleeve 7030. Third guide grooves 7031 are provided on opposite sides of the sleeve 7030, extending in a direction substantially perpendicular to the sliding direction of the release retaining member 7020. The release retainer 7020 has fourth drive grooves 7021 on its opposite sides. A fifth fixing pin 7071 is fixed to the first end of the retaining drive member 7070. 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 the 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. The retaining drive 7070 is closer to the engaging locking member 7010 in the first position than it is in the second position.

[0327] 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 release position to the locking position. Specifically, when the release retainer 7020 is in the retracted position, the engaging locking member 7010 is allowed to move from the release position to the locking position. Figure 71A The locked position shown has been moved to Figure 71B The locking position is shown, but the locking member 7010 cannot move from the unlocked position to the locked position. Only when the lever 710 is removed from the engaging device 7000, causing the unlocking retainer 7020 to be in the extended position, can the locking member 7010 move from the unlocked position to the locked position. When the portable carrier 700 is again placed on the carrying platform 6800 while the locking member 7010 is in the locked position, the lever 710 will push the locking member 7010 slightly, allowing it to enter the engaging 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.

[0328] Combined with reference Figure 72A and Figure 72B ,exist Figure 72A In this configuration, 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 down by the lever 710, holding the drive member 7070 in the first position. Figure 72BIn this configuration, the release retainer 7020 is not pressed by the latch 710, and the retaining drive 7070 is in the second position. The second end of the retaining drive 7070 has a receiving cavity 7072, and the first end of the stop 7060 is slidably inserted into the receiving cavity 7072. A third elastic member 7063 is provided between the first end of the stop 7060 and the end wall of the receiving cavity 7072, and the third elastic member 7063 is adapted to bias the stop 7060 towards the engaging locking member. Long slots 7073 are provided on opposite sides of the retaining 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 both ends of the fourth fixing pin 7061 are slidably connected to the long slots 7073 on opposite sides of the retaining drive 7070. The elongated slot 7073 allows the stop 7060 to remain in its original position while the drive 7070 can move from the second position to the first position without interference from the fourth fixing pin 7061. In other words, even if the second end of the stop 7060 is abutted by the locking member 7010, the drive 7070 can still move from the second position to the first position.

[0329] 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 will overcome 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 The diagram shows the engaging locking member 7010 in the locked position when the release retainer 7020 is pressed. Due to the abutment of the engaging locking member 7010, the stop 7060 remains in position, and the third elastic member 7063, located between the first end of the stop 7060 and the end wall of the receiving cavity 7072, is compressed. When the engaging locking member 7010 pivots from the locked position to the released position under the pull of the second traction member 7110, the position of the locking hole 7014 of the engaging locking member 7010 aligns with the position of the second end of the stop 7060. Under the elastic restoring force of the third elastic member 7063, the second end of the stop 7060 moves backward and inserts into the locking hole 7014, causing the stop 7060 to engage with the locking hole 7014. At this time, because the stop 7060 is engaged with the locking hole 7014, the stop 7060 prevents the pivoting of the engaging 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 73BThe diagram shows the engaging locking member 7010 in the unlocked position when the unlocking retainer 7020 is pressed. When the unlocking retainer 7020 is in the retracted position, the stop 7060 is adapted to hold the engaging locking member 7010 in the unlocked 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 is disengaged from the locking hole 7014, the pivoting of the engaging locking member 7010 is no longer hindered by the stop 7060, and therefore, the engaging locking member 7010 can pivot from the unlocked position to the locked position under the pull of the tension spring 7040.

[0330] According to the handcart 600 of the present invention, when a user wants to remove the portable carrier 700 from the support platform 6800, the locking member 7010 can be moved from the locked position to the unlocked position and remain in the unlocked position by operating the locking and unlocking member 7100 once. Furthermore, the user does not need to operate the locking and unlocking member 7100 before the locking lever 710 is removed from the locking device 7000, and the locking member 7010 remains in the unlocked position, thus facilitating the user to remove the portable carrier 700 from the support platform 6800. After the portable carrier 700 is removed, the locking member 7010 will pop out again from the locking device housing 7080, releasing the unlocked state of the locking member 7010.

[0331] It is understood that the locking device structure proposed in this aspect can be applied to the handcart proposed in any aspect of this invention.

[0332] Another aspect of the invention 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.

[0333] Reference Figures 74 to 76The 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 at the top of the lower frame 8100. A locking device 8400 is also provided at 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 secures 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 a locking release member 8500 via a traction member 8510. Similar to the locking release member 7100 described in the above embodiments, the locking release member 8500 can be operated to release the locking device 8400 from engaging the lever 710 of the portable carrier, such as the previously described portable carrier 700.

[0334] In this embodiment, the trolley 800 also has a symmetrical structure. The following description uses one side of the trolley 800 as an example; 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.

[0335] Reference Figures 77 to 79The 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 a traction member 8510 is connected to a 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. Guide grooves 8521 are provided on opposite sides of the locking release member housing 8520, and the guide grooves 8521 extend in a direction generally perpendicular to the sliding direction of the locking release button 8530. The locking / releasing button 8530 has drive grooves 8531 on opposite sides. The first end of the traction member 8510 is connected to a retaining pin 8540 within the locking / releasing button 8530. The two ends of the retaining pin 8540 protrude from the two drive grooves 8531 on opposite sides of the locking / releasing button 8530 and are slidably embedded in two guide grooves 8521 on opposite sides of the locking / releasing member housing 8520. When the locking / releasing button 8530 is pressed to move it, the retaining 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 pressing of the locking / releasing button 8530 is released, the locking / releasing 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 and unlocking mechanism 8500 is the same as the method of releasing the locking device 7000 by operating the locking and unlocking mechanism 7100 described in the above embodiment, and will not be repeated here.

[0336] 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 deployed state (e.g....), Figure 74 , Figure 75 , Figures 77 to 79As shown), the first link 8310 and the second link 8320 are largely collinear and extend generally vertically. When the rider 8200 folds down (as shown...), Figure 80 As shown), the first rod 8310 pivots about the intermediate pivot point 8311 relative to the lower support rod 8220, and the first rod 8310 pivots relative to the second rod 8320, such that the second end of the first rod 8310 moves toward the first end of the second rod 8320. The pivotable connections between the components of the support member 8300, and the pivotable connections between the support member 8300 and 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.

[0337] Reference Figure 79 and Figure 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 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, and the torsion spring 8620 biases the anti-pinch member 8600 in the pivot direction that causes the anti-pinch member 8600 to extend out of the locking and releasing member housing 8520.

[0338] During the folding process 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 release housing 8520 fixed to the second end of the lower support rod 8220 and the first rod 8310 also move closer to each other. The anti-pinch member 8600 prevents, for example, a user's finger from being pinched by the close proximity of the locking release housing 8520 and the first rod 8310. When the trolley 800 is folded 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 spring force of the torsion spring 8620, causing the anti-pinch member 8600 to pivot in the pivoting direction of the retracted locking release housing 8520, thereby avoiding interference between the anti-pinch member 8600 and the lower frame 8100, thus reducing the volume of the trolley 800 after folding. When the trolley 800 is unfolded, under the elastic restoring force of the torsion spring 8620, the anti-pinch member 8600 pivots in the pivot direction of the extended locking and releasing housing 8520 to return to its original position. Figure 79 The initial position is shown.

[0339] Figure 81 and Figure 82A handcart according to another embodiment of the above aspects is shown. The main difference between the handcart in this embodiment and the handcart in the above embodiment 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 embodiment; similarities will not be repeated.

[0340] Reference Figure 81 and Figure 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 locking lever 710 of the portable vehicle, such as the portable vehicle 700 described above. 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 the locking / unlocking member 8800 is located on the left side of the lower frame 8100 in the illustrated embodiment, 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 member 8800 is provided in the illustrated embodiment, in other embodiments, two or more locking and unlocking members 8800 may be provided, which are respectively provided on different sides of the lower frame 8100.

[0341] In this embodiment, the lower frame 8100 has two outer rods 8120 located on opposite sides. The outer rods 8120 extend generally along the front-rear direction of the trolley 800. A locking / unlocking mechanism 8800 is provided on one side of one of the outer rods 8120 for user operation. Specifically, the locking / unlocking mechanism 8800 is provided on the outer rod 8120 located on the left side. The user can release the locking / unlocking device 8400 by operating the locking / unlocking mechanism 8500. The locking / unlocking mechanism 8500 is connected to the locking / unlocking device 8400 via a traction member 8810. Figure 81 and Figure 82 Only the two ends of the traction member 8810 connected to the locking and unlocking member 8500 and the locking device 8400 are shown, while the middle part of the traction member 8810 is omitted. The middle part of the traction member 8810 can be arranged on the lower frame 8100 along any suitable path, as long as the locking and unlocking member 8500 can drive the locking device 8400 via the traction member 8810.

[0342] The locking and releasing mechanism 8800 includes a locking and releasing button 8820 slidably disposed on the outer rod 8120. The locking and 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 and releasing mechanism 8800. The locking and 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 and releasing button 8820, and the connecting part 8822 is connected to the mounting block 8830. When the locking and 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 locking and unlocking lever 8820 is released, it returns 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 embodiments, and will not be repeated here.

[0343] It is understood that the locking and unlocking mechanism and its placement proposed in this aspect can be applied to any of the handcarts proposed in this invention.

[0344] Another aspect of the invention provides a trolley having an engaging device for engaging a portable vehicle. The main difference between the trolley in this aspect and the trolley described in the above embodiments lies in the structure of the engaging device and the engaging / unlocking mechanism. The following will primarily describe the differences between the trolley in this embodiment and the trolley in the above embodiments; similarities will not be repeated.

[0345] Reference Figure 83 and Figure 84The handcart 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 member 9400. When a portable vehicle, such as the previously described portable vehicle 700, is placed on the lower frame 9100 (i.e., carried on the support platform), the engaging device 9300 secures the portable vehicle. The engaging-releasing member 9400 can be operated 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 member 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 disposed on the left side of the lower frame 9100, in other embodiments the locking / unlocking member 9400 may be disposed on the right side, or on the front 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 disposed on different sides of the lower frame 9100.

[0346] In this embodiment, the lower frame 9100 has two outer rods 9120 located on opposite sides. The outer rods 9120 extend generally 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 provided on the outer rod 9120 located on the left side. The user can release the locking / unlocking device 9300 by operating the locking / unlocking mechanism 9400. Figure 85 The locking and unlocking component 9400 is connected to the locking device 9300 via the traction component 9410. Figure 85 The diagram shows one end of the traction member 9410 connected to the locking and unlocking member 9400, and the other end of the traction member 9410 connected to the locking device 9300 (see reference). Figure 89 It is understood that the traction member 9410 can be arranged along any suitable path between the locking / unlocking member 9400 and the locking device 9300, which will not be elaborated further here.

[0347] Reference Figure 85 and Figure 86The locking / unlocking mechanism 9400 includes a locking / unlocking push button 9420 slidably disposed on the outer rod 9120. The locking / unlocking push button 9420 is configured to be pushed by a user (e.g., by kicking) to move the traction member 9410, causing the locking device 9300 to release under the actuation of the traction member 9410. In this embodiment, the locking / unlocking mechanism 9400 also includes a linkage member 9430, a mounting base 9440, and a connector 9450. The locking / unlocking push button 9420 is connected to the traction member 9410 via the linkage member 9430. Specifically, a first end of the linkage member 9430 is fixedly connected to the locking / unlocking push button 9420 by, for example, a fastener, and a second end of the linkage member 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 the two outer rods 9120 and is at a height higher than the plane containing the two outer rods 9120. A mounting base 9440 is fixed within the inner frame 9130. In this case, the mounting base 9440 is at a height higher than the latch release button 9420. Figure 86 As shown, the middle portion of the linkage 9430 is inclined, thereby achieving a height transition between the first end connected to the latch-release 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 latch-release push button 9420, or the linkage 9430 can be omitted and the latch-release push button 9420 can be directly slidably connected to the mounting base 9440.

[0348] One end of the traction member 9410, which connects to the locking / unlocking member 9400, is fixed to the connector 9450 within the mounting base 9440. The connector 9450 is, for example, in the form of a pin. The mounting base 9440 is provided with a guide groove 9441, which extends in a direction substantially perpendicular to the sliding direction of the locking / unlocking push button 9420. The second end of the linkage member 9430 is provided with a drive groove 9431. The connector 9450 passes through both the guide groove 9441 and the drive groove 9431, and is slidably embedded in both. When the locking / unlocking push button 9420 is pushed (or pressed) to move it toward the mounting base 9440, the connector 9450, connected to the traction member 9410, moves 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 release button 9420 is removed, the release button 9420 can return to its initial position under the action of, for example, the elastic restoring force of an elastic element (not shown).

[0349] 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.

[0350] Back 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 following will refer to... Figures 87 to 91 The engaging device 9300 of this embodiment is described.

[0351] like Figure 87 As shown, the engaging device 9300 includes an engaging device housing 9310, and an engaging locking member 9320 and a release 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 release 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 carrier placed on a 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 carrier to remove the portable carrier 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 extends 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.

[0352] Reference Figures 88 to 91The 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 is that the driving method of the engaging locking member 9320 of the engaging device 9300 is different from the driving method of the engaging locking member 7010 of the engaging device 7000. The following will mainly describe the differences between the two, and the similarities will not be repeated.

[0353] 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 it. When the locking member 9320 is in the locked position, the locking hook 9321 engages with the lever of the portable vehicle; 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 toward 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.

[0354] 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 toward the end of 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 toward the end of 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 actuation 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 to drive the engaging locking member 2010 from the locked position to the unlocked position. For example, refer to Figure 89 When the locking and unlocking member 9400 is operated, the first driving block 9370 moves in the first direction D1 (which is substantially parallel to the sliding direction of the stop member 9350) under the drive of the traction member 9410, and pushes the locking member 9320 in the second direction D2 (which is substantially perpendicular to the sliding direction of the stop member 9350), so that the locking member 9320 moves from the locked position to the unlocked position.

[0355] The fixing rod 9110 has a first limiting groove 9111 extending along the second direction D2. The locking hook 9321 of the engaging locking member 9320 passes through the first limiting groove 9111 and exits from the fixing rod 9110. The first limiting groove 9111 is configured such that the engaging locking member 9320 is movable between a locked position and an unlocked position along the first limiting groove 9111, and such that the engaging locking member 9320 remains in the second direction D2 without offset when moving between the locked and unlocked positions. The fixing rod 9110 also has at least one second limiting groove 9112. The first drive 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 fitted into 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 engagement of the limiting member with 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 may be provided, or more than two second limiting grooves 9112 and a corresponding number of limiting holes 9371 may be provided.

[0356] 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.

[0357] The first drive block 9370 has a clearance hole 9372 for the connecting rod 9381 to pass through. The clearance 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, through the sliding engagement of the first and second inclined surfaces, the second drive block 9380 will move along the second direction D2 under the drive of the first drive block 9370. 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.

[0358] 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 element 9390 is 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 along the connecting rod 9381 in the opposite direction of the second direction D2 under the action of 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.

[0359] 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 locking hole 9322 is aligned with the end of the stop member 9350 facing the locking member 9320, and the stop member 9350 is inserted into the locking hole 9322, thus engaging 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 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 engaging locking member 9320 moves in the opposite direction of the second direction D2 under the elastic restoring force of the first elastic member 9390 until it is translated to the locking position. The release process of the engaging device 9300 in this embodiment is similar to the release process of the engaging device 7000 described in the above embodiment. Specific details can be referred to in the above embodiment, and will not be repeated here.

[0360] Figures 92 to 95 A locking device according to another embodiment of the present invention is shown. The main difference between the locking device in this embodiment and the locking device in the above embodiments lies in 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 embodiments; similarities will not be repeated.

[0361] Reference Figure 93 The locking element 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. (Refer to...) Figure 94 and Figure 95The engaging 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 a slot 9323 to fix the engaging 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 can be integrally formed.

[0362] Back 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 handle bar 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, respectively.

[0363] Reference 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, 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 shifting within the receiving cavity 9510 and preventing the object from easily falling out of the receiving cavity 9510. The clamping portion 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 portions 9511 may be uniformly arranged around the inner periphery of the opening of the receiving cavity 9510, each clamping portion 9511 having, for example, an arc-shaped edge, while in some embodiments, a strip-shaped clamping portion 9511 may be provided on a local edge of the opening of the receiving cavity 9510.

[0364] 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 as to detachably install the shelf 9500 onto the rider 9200. For example, refer to Figure 97 and Figure 98In this embodiment, the first and second connectors are connected to each other using an elastic snap-fit ​​mechanism. 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 can be understood that in other embodiments, the locking seat 9520 can be provided on the push rod 9210, while the fixing seat 9230 can be provided on the shelf 9500.

[0365] Continue to refer to Figure 97 and Figure 98 The locking seat 9520 is adapted to be inserted into the fixing seat 9230 for installation. The fixing seat 9230 has a locking groove 9231, and the locking seat 9520 has 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 resilient portion 9521 with the locking groove 9231, the locking seat 9520 can be held fixed on the fixing seat 9230, thereby securely installing the shelf 9500 onto the rider 9200.

[0366] Figures 99 to 102 A handcart according to another embodiment of the above aspects is shown. The main difference between the handcart in this embodiment and the handcart in the above embodiment 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 embodiment; similarities will not be repeated.

[0367] Reference Figure 99 and Figure 100 The trolley 900 includes a support member 9600 connecting the handlebar 9200 and the lower frame 9100. The support member 9600 is folded down during the transition of the handlebar 9200 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 handlebar 9200, and the other end 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 is pivotally connected to the outer rod 9120 of the lower frame 9100.

[0368] In this embodiment, the trolley 900 includes a locking / unlocking member 9700. Similar to the locking / unlocking member 9400 described in the previous embodiments, the locking / unlocking member 9700 is operable to release the locking device 9300 from engaging the lever 710 of the portable carrier, such as the portable carrier 700 described earlier. The difference from the previous embodiments is that the locking / unlocking member 9700 is disposed on the support member 9600, specifically on the second lever 9620 of the support member 9600. (Combined with...) Figure 101 and Figure 102 The locking / unlocking component 9700 is connected to the locking device 9300 via the traction component 9710. The handcart 900 has a generally symmetrical structure, with support components 9600 on both the left and right sides. It is understood that although in this embodiment the locking / unlocking component 9700 is located on the left support component 9600, in other embodiments, the locking / unlocking component 9700 may be located on the right support component 9600, or the locking / unlocking component 9700 may be located on both the left and right support components 9600. Figure 101 and Figure 102 The diagram shows one end of the traction member 9710 connected to the locking / unlocking member 9700, and the other end of the traction member 9710 connected to the locking device 9300. It is understood that the traction member 9710 can be arranged along any suitable path between the locking / unlocking member 9700 and the locking device 9300, which will not be elaborated further here.

[0369] Continue to refer to Figure 101 and Figure 102 The locking and releasing mechanism 9700 includes a locking and releasing handle 9720 and a fixing pin 9730 fixed to the locking and releasing handle 9720. One end of a traction member 9710 connected to the locking and releasing mechanism 9700 is fixedly connected to the fixing pin 9730. The locking and releasing handle 9720 is, for example, in the form of a sleeve, and is slidably mounted 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 and are fixed to the locking and releasing handle 9720, allowing the fixing pin 9730 to slide along the sliding grooves 9621. Through the sliding engagement of the fixing pin 9730 with the sliding grooves 9621, the locking and 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, it will drive the traction member 9710 to move, thereby releasing the locking device 9300.

[0370] Figures 103 to 106 A handcart according to another embodiment of the above aspects is shown. The handcart in this embodiment is similar to... Figures 83 to 86The main difference between the handcarts in the above embodiments shown lies in the structure and operation of the locking and unlocking mechanism. The following will primarily describe the differences between the handcarts in this embodiment and those in the above embodiments; similarities will not be repeated.

[0371] Reference Figure 103 and Figure 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 located 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 engaging / releasing element 9800 is located on the left side of the lower frame 9100, i.e., on the outer rod 9120 located on the left side, in other embodiments the engaging / releasing 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 and unlocking element 9800 is provided in the illustrated embodiment, in other embodiments, two or more locking and unlocking elements 9800 may be provided, which are respectively provided on different sides of the lower frame 9100.

[0372] The user can release the locking device 9300 by operating the locking / unlocking mechanism 9800. Combined with... Figure 105 The locking and unlocking component 9800 is connected to the locking device 9300 via the traction component 9810. Figure 105 The diagram shows one end of the traction member 9810 connected to the locking / unlocking member 9800. The other end of the traction member 9810 extends through the inner frame 9130 and the fixing rod 9110, connecting to the locking device 9300. It is understood that the traction member 9810 can be arranged along any suitable path between the locking / unlocking member 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 member 9400, in this embodiment, the user releases the locking device 9300 by, for example, stepping on the locking / unlocking member 9800.

[0373] Reference Figure 105 and Figure 106The 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 / unlocking 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 the user, such as by stepping on it. A connecting portion 9822 connects the head of the end of the traction member 9810 that is connected to the locking / unlocking 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, thereby releasing the locking device 9300. When the downward pressure on the pedal 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 the elastic element (not shown).

[0374] According to the handcart 900 of this aspect, by setting the locking and unlocking device 9800 on the side of the lower frame 9100 and setting the locking and unlocking device 9800 to be operated by the user stepping on it, the user can unlock the locking device 9300 without bending over, thus simplifying the user operation.

[0375] It is understood that the structure and placement of at least one of the engaging device and engaging / unlocking mechanism proposed in this aspect can be applied to the handcart proposed in any aspect of the present invention. It is also understood that, where there is no conflict, the engaging device according to any embodiment of any aspect of the present invention can be used in conjunction with the engaging / unlocking mechanism according to any embodiment of any aspect of the present invention.

[0376] 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.

[0377] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended 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, wherein 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; as well as A lifting adjustment release mechanism is configured to be operable to switch the lifting adjustment mechanism from the locked state to the released state; One of the first bracket and the second bracket is pivotally connected to the lifting adjustment member, 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 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, it can move axially along the limit rod by rotating the limit rod.

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

6. 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 removed 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.

7. The handcart according to claim 6, 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 is configured to move toward the locking member when the locking and unlocking member is operated, so as to drive the locking 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.

8. The handcart according to claim 6, characterized in that: The trolley also includes a locking / unlocking mechanism, which is configured to be operable to pivot or translate the locking / unlocking mechanism from the locking position to the unlocking position. The engaging device further includes a retaining drive and a stop that is slidable relative to the retaining drive. The retaining drive is movable between a first position and a second position, and the retaining drive is closer to the engaging locking member when it is in the first position than when it is 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.

9. 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.

10. The handcart according to claim 9, 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.

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