Wheeled mobility device

Abstract

The wheeled transportation device (1) of the present invention comprises a frame body (400), at least one wheel (300) provided below the frame body and rotatable about a directional axis (A) relative to the frame body, and a limiting structure (100) provided between the frame body (400) and the wheel (300) and operable to limit the range of directional rotation of the wheel (300).

Description

[Technical Field]

[0001] The present invention relates to a wheeled transportation device. [Background technology]

[0002] Wheeled transportation devices, such as strollers, pet carts, shopping carts, and handcarts, are common infant carriers. Strollers typically include a frame, a seat, and wheels. The wheels are attached to the underside of the frame to provide the stroller with propulsion.

[0003] A typical wheeled transportation device has a pair of front wheels and a pair of rear wheels. Wheeled transportation devices with a drift function have been commercially available. The front and rear wheels of the wheeled transportation device can rotate in any direction around a substantially vertical axis, allowing the wheeled transportation device to travel in any direction. However, wheeled transportation devices with a drift function have a problem in that when the wheeled transportation device encounters an obstacle or travels on a slope, the rear wheels rotate directional to a forward position, which can cause the wheeled transportation device to tip over. Summary of the Invention

[0004] According to the wheeled transportation device of the present invention, the wheeled transportation device comprises a frame body, at least one wheel, and a limiting structure, wherein the at least one wheel is provided below the frame body and is rotatable around a directional axis relative to the frame body, and the limiting structure is provided between the frame body and the wheel, and the limiting structure is operable to limit the range of directional rotation of the wheel.

[0005] In one embodiment, the limiting structure comprises a first housing connected to the frame body and a second housing connected to the wheel and rotatable relative to the first housing around the directional axis, and the limiting structure is configured to limit the range of rotation between the first housing and the second housing.

[0006] In one embodiment, the first housing is provided with a first limiting portion, the second housing is provided with a second limiting portion, and the first limiting portion is operably engaged with the second limiting portion to limit the range of rotation between the first housing and the second housing.

[0007] In one embodiment, the wheel is at least one rear wheel, and the limiting structure prevents the rear wheel from rotating into a forward position.

[0008] In one embodiment, one of the first limiting portion and the second limiting portion is a pin that can move toward or away from the other of the first limiting portion and the second limiting portion, and the other of the first limiting portion and the second limiting portion is a groove extending around the directional axis, and the first limiting portion is operably moved and inserted into the second limiting portion so as to limit the range of rotation between the first housing and the second housing depending on the extension range of the second limiting portion.

[0009] In one embodiment, the pin moves in a direction generally parallel to the pointing axis.

[0010] In one embodiment, the second limiting portion is provided on the other of the first housing and the second housing, and is located at an interface where the first housing and the second housing are adjacent to each other.

[0011] In one embodiment, the second limiting portion further has a locking hole, and the first limiting portion can be inserted into the locking hole to prevent relative rotation between the first housing and the second housing.

[0012] In one embodiment, the lock hole is opened at the middle of the second limiting portion in the circumferential direction.

[0013] In one embodiment, the groove is arc-shaped and has an extension range of 300°.

[0014] In one embodiment, the first limiting portion is connected to an unlocking structure via a connecting member, and the unlocking structure is operable to move the first limiting portion away from the second limiting portion via the connecting member.

[0015] In one embodiment, the unlocking structure comprises a drive member, an operating member, and a moving member, wherein the drive member is connected to a first end of the connecting member and can be rotated to pull the connecting member, the operating member is operable to move from outside the wheeled transportation device, and the moving member is engaged with the operating member and can drive the rotation of the drive member in response to movement of the operating member.

[0016] In one embodiment, the second end of the connecting member is connected to the first limiting portion, and when the connecting member is pulled, the connecting member disengages the first limiting portion from the second limiting portion.

[0017] In one embodiment, the operating member is provided on the handlebar of the wheeled transportation device and can move perpendicular to the handlebar, the operating member has an abutment portion that protrudes toward the inside of the handlebar, the abutment portion abuts against the transportation member, a guide portion is formed on the side of the transportation member facing the drive member, and a protrusion that rises along the rotation axis of the drive member is provided around the drive member, and the guide portion can abut against the protrusion so that the guide portion abuts against the protrusion and causes rotation of the drive member by moving the transportation member through movement of the operating member.

[0018] In one embodiment, the unlocking structure includes two driving members, one of which drives the limiting structure via the connecting member, and the other of which drives the lock module via the other connecting member; the unlocking structure includes two moving members, each of which corresponds to one of the two driving members and can drive the corresponding driving member; and the operating member is configured to be selectively abuttable against one of the two moving members.

[0019] In one embodiment, the unlocking structure further includes a selection member operable to link one of the two moving members with the operating member, such that the moving member linked with the operating member is pressed by the operating member to drive the corresponding driving member.

[0020] In one embodiment, the limiting structure is connected to the wheel via a wheel seat, the wheel seat is movable along the vertical direction relative to the limiting structure, and a buffer spring is provided between the limiting structure and the wheel seat.

[0021] In one embodiment, the wheeled transportation device is a stroller or a pet cart.

[0022] According to another wheeled transportation device of the present invention, the wheeled transportation device comprises a frame body, two wheels, and a limiting structure, wherein the two wheels are provided below the frame body and are rotatable around a directional axis relative to the frame body, and the limiting structure is provided between the two wheels and operably limits the range of directional rotation of the wheels.

[0023] In one embodiment, the limiting structure comprises two first housings, two second housings, and an interlocking member, the two first housings being respectively connected to the frame body, the two second housings being respectively connected to the two wheels, and each being rotatable around the pointing axis relative to the two first housings, and the interlocking member being connected to the two second housings, thereby causing the two second housings to rotate synchronously around their respective pointing axes.

[0024] In one embodiment, the linkage member is a rod extending laterally and connected to each of the second housings by a linkage shaft parallel to the directional axis, and the linkage member and the first housing interfere with each other to limit the rotation range of the second housing. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a side view of a wheeled transportation device according to a first embodiment of the present invention, with the rear wheels positioned at the rear. [Figure 2] FIG. 1 is a side view of a wheeled transportation device with the rear wheels in a forward position. [Figure 3] FIG. 1 is a perspective view of a wheeled transportation device with the rear wheels in a rearward position. [Figure 4] FIG. 1 is a perspective view of a wheeled transportation device with rear wheels in an oblique position. [Figure 5] FIG. 2 is a perspective view of a limiting structure and a wheel of a wheeled transportation device. [Figure 6] FIG. 2 is an exploded perspective view of the limiting structure and the wheel. [Figure 7] FIG. 10 is a side cross-sectional view of the limiting structure with the pin in the released position. [Figure 8] FIG. 10 is a side cross-sectional view of the limiting structure with the pin in the locked position. [Figure 9] FIG. 10 is a perspective view of a second housing of the restriction structure. [Figure 10] This is a rear view of the wheeled transportation device with part of the controller housing removed to show the inside of the lock release structure. [Figure 11] FIG. 11 is an enlarged view of a block portion of FIG. [Figure 12] FIG. 10 is a partial enlarged view of the unlocking structure of the wheeled transportation device with the locking structure housing and mounting plate removed. [Figure 13] FIG. [Figure 14] FIG. 10 is a perspective view of a wheeled transportation device according to a second embodiment of the present invention, with the wheels in a rear position. [Figure 15] FIG. 15 is an enlarged view of a block portion in FIG. [Figure 16] FIG. 1 is a perspective view of a wheeled transportation device with wheels in an oblique position. [Figure 17] FIG. 10 is a perspective view of a wheeled transportation device according to a third embodiment of the present invention. [Figure 18] FIG. 2 is a perspective view of a second housing of the wheeled transportation device. [Explanation of symbols]

[0026] 1. Wheeled mobility device 100 Restrictive Structure 110 First Housing 111 Storage groove 112 First Segment 113 Second Segment 120 Second Housing 121 Second Restriction Section 122 Directional axis hole 123 Lock hole 124 Disc-shaped part 125 Wheel seat connection part 128 Connection seat 130 Directional axis 140 First Restriction 150 Recovery Materials 200 Unlocking Structure 210 Driving member 211 Protrusion 212 recess C Rotation axis 220 Moving parts 221 Guide section 222 Insertion part 223 Pressing surface 230 Operating member 231 Contact part 232 Head 240 Unlocking structure housing 250 Mounting plate 260 Spring 270 Selected Members 271 Button 272 Slide section 273 Recovery Materials 290 Connecting members 291 1st end 292 2nd end 300 wheels 310 Wheel seat 320 Buffer spring 400 frame body 410 handlebar 500 Restricted Structure 510 Interlocking members 520 Interlocking shaft A Directional axis DETAILED DESCRIPTION OF THE INVENTION

[0027] Although the present invention will be understood and described with reference to specific embodiments herein, it should not be construed as being limited to the details shown. Rather, various modifications may be made to these details, within the scope and range of equivalents of the claims, without departing from the invention.

[0028] The explanations of directions such as "front," "back," "up," and "down" in the present text are merely for ease of understanding, and the present invention is not limited to these directions. Although the present invention has been described with reference to typical embodiments according to the actual situation, the terms used are for explanation and illustration only, and are not limiting.

[0029] A first embodiment of a wheeled transportation device 1 according to the present invention will be generally described with reference to Figures 1 and 2. In this embodiment, the wheeled transportation device 1 is shown as a stroller, but the wheeled transportation device 1 of the present invention may also be a pet cart, a shopping cart, a handcart, or the like.

[0030] The wheeled transportation device 1 includes a frame body 400 and at least one wheel 300 provided below the frame body 400. The wheel 300 is rotatable relative to the frame body 400 about a pointing axis A. More specifically, the wheel 300 is rotatable about the pointing axis A, which extends substantially vertically, between a rear position as shown in FIG. 1 and a forward position as shown in FIG. 2.

[0031] The wheels 300 of the wheeled transportation device 1 in this embodiment include a pair of front wheels and a pair of rear wheels, and each wheel 300 is rotatable (i.e., rotatable in any direction) around its respective directional axis A. This allows the wheeled transportation device 1 to travel in any direction (i.e., drift).

[0032] 3 and 4, there is shown a limiting structure 100. The limiting structure 100 is provided between the frame body 400 and the wheel 300, and the limiting structure 100 is operable to limit the range of directional rotation of the wheel 300. Although the figures show only the limiting structure 100 provided on one rear wheel, it may be understood that the limiting structure 100 may be provided on any wheel 300.

[0033] FIG. 3 shows the wheel 300 in a rearward position, and FIG. 4 shows the wheel 300 in an oblique position. In this embodiment, the wheel 300 is rotatable within a certain angular range based on the rearward position, i.e., is prevented from rotating to a forward position. However, it should be understood that in other embodiments, the wheel 300 may be restricted to rotate within other angular ranges, for example, may rotate within a certain angular range based on a forward position, a lateral position, or an oblique position. The size of this angular range can be set according to needs, as will be described in detail below.

[0034] The restriction structure 100 according to the present invention will be described in detail with reference to FIGS.

[0035] The limiting structure 100 includes a first housing 110 and a second housing 120. The second housing 120 is connected to the wheels 300 and is rotatable relative to the first housing 110 about a pointing axis A. The rotational connection between the first housing 110 and the second housing 120 will be described in detail later.

[0036] Referring to FIG. 6 , the restriction structure 100 will be described in more detail, showing the specific structures of the first housing 110 and the second housing 120, as well as the first and second restriction portions 140 and 121 provided on the first and second housings 110 and 120. In this embodiment, the first housing 110 includes a hollow first segment 112 and a hollow second segment 113 that are connected vertically. The first segment 112 is provided above the second housing 120, and the first restriction portion 140 is provided on the first segment 112. The first segment 112 extends substantially vertically, and the second segment 113 extends obliquely upward relative to the vertical direction. The second housing 120 has a disk-shaped portion 124 and a wheel seat connecting portion 125 that are connected to each other along the vertical direction. The axial direction of the disk-shaped portion 124 is aligned vertically, and the wheel seat connecting portion 125 extends vertically. The second limiting portion 121 is provided on the disk-shaped portion 124, and is, for example, a groove recessed downward toward the periphery of the disk-shaped portion 124 on the upper surface of the disk-shaped portion 124 in the vertical direction. The wheel seat connecting portion 125 is connected to the wheel 300 in the vertical direction via the wheel seat 310. In other embodiments, depending on the structure of the wheeled transportation device 1, the first segment 112 and the second segment 113 may extend in other directions, or the first housing 110 may include only one segment. The second housing 120 may have any other appropriate shape as long as it can be connected to the wheel 300.

[0037] The first limiting portion 140 is operably engaged with the second limiting portion 121 so as to limit the relative rotation range between the first housing 110 and the second housing 120 .

[0038] More specifically, in this embodiment, the first limiting portion 140 is a pin that is movable substantially parallel to the directional axis A, and the second limiting portion 121 is a recessed groove that extends in an arc around the directional axis A. The first limiting portion 140 is operably moved and inserted into the second limiting portion 121 so as to limit the relative rotation range between the first housing 110 and the second housing 120 in accordance with the extension range of the second limiting portion 121.

[0039] In other embodiments, the first limiter 140 may move at an angle to the directional axis A, i.e., may engage the second limiter 121 obliquely.

[0040] 6 and 9, in this embodiment, the second limiting portion 121 (groove) is further provided with a locking hole 123, and the first limiting portion 140 (pin) can be inserted into the locking hole 123 to lock the relative rotation between the first housing 110 and the second housing 120. More specifically, the locking hole 123 is provided at the center in the circumferential direction of the second limiting portion 121. In this manner, when the first limiting portion 140 is inserted into the locking hole 123, the wheel 300 is locked in the rearward position.

[0041] The specific structure of the limiting structure 100 will be further described with reference to Figures 7 and 8. The first limiting portion 140 (pin) of the limiting structure 100 is in the unlocked position in Figure 7 and in the locked position in Figure 8. The second housing 120 has an orientation shaft hole 122 formed on the orientation axis A (i.e., along the orientation axis A). The orientation shaft 130 is inserted into the orientation shaft hole 122 and connected to the first housing 110, thereby rotating the second housing 120 relative to the first housing 110. In this way, the relative rotation between the first housing 110 and the second housing 120 allows the wheel 300 to rotate relative to the frame body 400 around the orientation axis A.

[0042] In this embodiment, an accommodating groove 111 is formed in the first housing 110, and the first limiting portion 140 is disposed in the accommodating groove 111 and is slidable along the accommodating groove 111. The recovery member 150 is disposed in the accommodating groove 111 and presses the first limiting portion 140 toward the second limiting portion 121, i.e., the pin is pressed toward and inserted into the recessed groove. When the first limiting portion 140 is engaged with the second limiting portion 121, the first limiting portion 140 protrudes largely from the accommodating groove 111, and when the first limiting portion 140 is disengaged from the second limiting portion 121, the first limiting portion 140 protrudes little from the accommodating groove 111.

[0043] The second limiting portion 121 (groove) is opened in the second housing 120 and is located at the interface where the first housing 110 and the second housing 120 are adjacent to each other. In this manner, the first limiting portion 140 (pin) can be engaged with the second limiting portion 121. The first limiting portion 140 can move to the second limiting portion 121 by gravity and / or the pressing force of the recovery member 150.

[0044] 7 and 8 also show a wheel seat 310. The wheel seat connection portion 125 of the second housing 120 of the limiting structure 100 is connected to the wheel 300 via the wheel seat 310, which is vertically movable relative to the limiting structure 100. A buffer spring 320 is provided between the wheel seat connection portion 125 and the wheel seat 310. More specifically, the wheel seat 310 is provided below the second housing 120. One vertical end of the second housing 120 is rotatably connected to the first housing 110, and the other vertical end of the second housing 120 is connected to the wheel seat 310. The buffer spring 320 is provided substantially vertically between the second housing 120 and the wheel seat 310, and the wheel 300 is rotatably connected to the wheel seat 310. In this way, the buffer spring 320 can absorb vertical impacts and vibrations that the wheel-type transportation device 1 receives, providing a comfortable experience for the occupant.

[0045] In other embodiments, the wheel seat 310 may be omitted and the wheel 300 may be connected directly to the limiting structure 100, as will be described in more detail below.

[0046] 7 and 8 and 3 , the first housing 110 is connected to a frame body 400, and specifically, the second segment 113 of the first housing 110 is connected to the frame body 400. The first limiting portion 140 is connected to the unlocking structure 200 via a connecting member 290, and the unlocking structure 200 is operable to move the first limiting portion 140 away from the second limiting portion 121 via the connecting member 290. More specifically, a second end 291 of the connecting member 290 is connected near an edge of the first limiting portion 140. For example, the connecting member 290 may be a flexible wire, and the second end 291 may be a hammer head that is connected to a corresponding recess in the first limiting portion 140.

[0047] In Fig. 8, the first limiting portion 140 is inserted into the second limiting portion 121. In Fig. 7, the first limiting portion 140 is pulled by the connecting member 290 and partially disengaged from the second limiting portion 121. When the first limiting portion 140 is completely disengaged from the second limiting portion 121, the wheel 300 can rotate by a certain angle in correspondence with the second limiting portion 121.

[0048] As described above, the second limiting portion 121 may be provided as a groove recessed downward toward the periphery of the disk-shaped portion 124 on the vertical upper surface of the disk-shaped portion 124. The second limiting portion 121 may extend circumferentially from the edge of the locking hole 123 toward both sides. In this embodiment, the extension range of the second limiting portion 121 is approximately 300°. The second limiting portion 121 is provided based on the rear position of the wheel 300, i.e., when the wheel 300 is in the rear position, the first limiting portion 140 is located approximately in the middle of the second limiting portion 121. It may be understood that by changing the angular position and angle range of the second limiting portion 121, the wheel can be rotated within a selected angle range in a forward position, a lateral position, or an oblique position.

[0049] Although the first limiting portion 140 and the second limiting portion 121 have been described above as examples of a pin and a groove, it should be understood that the first limiting portion 140 and the second limiting portion 121 may be provided in other forms. For example, the first limiting portion 140 may be a stopper, and the second limiting portion 121 may be a wall parallel to the directional axis A.

[0050] In another embodiment, the first limiting portion 140 and the second limiting portion 121 are interchangeable, i.e., the first limiting portion 140 may be a groove (e.g., an arc-shaped groove), and the second limiting portion 121 may be a pin. In this way, the receiving groove 111 is correspondingly opened in the first housing 110.

[0051] The unlocking structure 200 will be described in detail with reference to FIGS.

[0052] As shown in FIG. 10, the connecting member 290 is connected to the unlocking structure 200 , and the unlocking structure 200 is operable to pull the first restrictor 140 via the connecting member 290 .

[0053] As shown in FIG. 13 , the unlocking structure 200 includes an unlocking structure housing 240, a mounting plate 250, at least one driving member 210, an operating member 230, a moving member 220, and a spring 260. The unlocking structure housing 240 is disposed laterally along the handlebar 410 of the wheeled transportation device 1 and at least partially houses the other components of the unlocking structure 200. In this embodiment, the unlocking structure housing 240 is formed by combining two half housings for easy installation. However, in other embodiments, the unlocking structure housing 240 may be a single member. Alternatively, the unlocking structure housing 240 may be omitted, and the other components of the unlocking structure 200 may be directly installed in the hollow handlebar 410.

[0054] 11 to 13, the mounting plate 250 is disposed laterally on the unlocking mechanism housing 240. The drive member 210 can be rotatably connected to the mounting plate 250 about a rotation axis C (which is perpendicular to the plane of the drawing and located at the center of the drive member 210). The drive member 210 is connected to a first end 292 of a connecting member 290 and can rotate to pull the connecting member 290. More specifically, the first end 292 of the connecting member 290 (e.g., shaped like a hammerhead) is connected to a recess 212 formed on the periphery of the drive member 210. When the drive member 210 rotates clockwise (as viewed in FIGS. 11 to 13) about the rotation axis C, the connecting member 290 is pulled. In one embodiment, the drive member 210 can be provided with multiple recesses 212 to connect to multiple connecting members 290. For example, the drive member 210 is provided with one recess 212 on the side closer to the operating member 230 and one on the side farther from the operating member 230, and two connecting members 290 are connected to these two recesses 212, respectively, so that when the drive member 210 rotates clockwise around the rotation axis C, the two connecting members 290 are pulled, respectively. One connecting member 290 may be connected to the restriction structure 100 ( FIG. 4 ) of the present invention, and the other connecting member 290 may be connected to another restriction structure (not shown) or another unlocking module, such as a handlebar turning lock module or a frame body folding lock module. Therefore, one drive member 210 can simultaneously control multiple unlocking modules.

[0055] The operating member 230 can be operated and moved from outside the wheeled transportation device 1. The moving member 220 is engaged with the operating member 230 and can drive the rotation of the driving member 210 in response to the movement of the operating member 230.

[0056] More specifically, the operating member 230 is provided on the handle bar 410 of the wheeled transportation device 1, and can move vertically relative to the handle bar 410 (for example, move in the longitudinal direction). The operating member 230 has an abutment portion 231 formed to protrude toward the inside of the handle bar 410, and the abutment portion 231 abuts against the moving member 220. A guide portion 221 is formed on the side of the moving member 220 facing the drive member 210, and a protrusion 211 is provided around the drive member 210, rising along the rotation axis C of the drive member 210, and the guide portion 221 abuts against the protrusion 211 to cause rotation of the drive member 210. More specifically, as shown in FIG. 12 , the operating member 230 has a substantially rectangular head portion 232, and the abutment portion 231 is connected to the head portion 232 and extends from the head portion 232 toward the inside of the handle bar 410.

[0057] In this embodiment, the guide portion 221 is an abutment surface extending laterally. The position of the protrusion 211 is set so that it pulls the connecting member 290 when the driving member 210 is pressed against the moving member 220. For example, for the driving member 210 on the right side in FIGS. 11 to 13, the protrusion 211 is set on the left side of the rotation axis C, and when the guide portion 221 presses the protrusion 211, the driving member 210 rotates clockwise, thereby pulling the connecting member 290.

[0058] In one embodiment, the unlocking structure 200 includes two driving members 210 arranged along the lateral direction, each configured to drive a corresponding unlocking module. For example, one driving member 210 is configured to drive a wheel rotation lock module, i.e., the limiting structure 100 described herein, and the other driving member 210 is configured to drive a handlebar turning lock module, a frame body folding lock module, etc. The unlocking structure 200 includes two moving members 220, each corresponding to one of the driving members 210.

[0059] The operating member 230 can abut and press one of the two moving members 220. Furthermore, the unlocking structure 200 includes a selection member 270 that is at least partially provided in the unlocking structure housing 240 and is operable to bring one of the two moving members 220 and the operating member 230 into an interlocked state. The interlocked state means that the moving member 220 can be driven by the operating member 230, and for example, when one moving member 220 and the operating member 230 form an abutting relationship, the moving member 220 can be pressed by the operating member 230, which can further drive the drive member 210 corresponding to the moving member 220. More specifically, the selection member 270 is movably provided in the unlocking structure housing 240 and can move laterally (left and right) relative to the unlocking structure housing 240. The two movable members 220 each have an insertion portion 222 extending vertically, and the insertion portion 222 is inserted vertically into the selection member 270, for example, into two vertical slide grooves (not shown) of the slide portion 272 of the selection member 270, thereby allowing each movable member 220 to slide vertically relative to the selection member 270 and move horizontally in the unlocking structure housing 240 together with the selection member 270.

[0060] The unlocking mechanism housing 240 is further provided with a recovery member 273 that abuts between an inner wall of the unlocking mechanism housing 240 and one end of the selection member 270. In this embodiment, the recovery member 273 biases the selection member 270 laterally toward a left position, and in other embodiments, the recovery member 273 may bias the selection member 270 toward a right position.

[0061] When the selection member 270 is located at the left position (shown in FIGS. 11 to 13 ), the right-side moving member 220 and the operating member 230 form an interlocking relationship. More specifically, the right-side moving member 220 has a pressing surface 223 that faces the operating member 230 and extends laterally, and the pressing surface 223 can abut against the abutment portion 231 of the operating member 230. In this way, when the selection member 270 is located at the left position and the user presses the operating member 230, the pressing surface 223 abuts against the abutment portion 231, and the right-side moving member 220 correspondingly moves upward. Furthermore, the protrusion 211 of the driving member 210 moves along the guide portion 221, and the right-side driving member 210 rotates clockwise, thereby pulling the connecting member 290.

[0062] When the selection member 270 is located at the right position (not shown), both of the movable members 220 move rightward together with the selection member 270, so that the left movable member 220 and the operating member 230 form an interlocking relationship. In this way, when the selection member 270 is located at the right position and the user presses the operating member 230, the pressing surface 223 comes into contact with the abutment portion 231, so that the left movable member 220 moves upward accordingly, and further, the protrusion 211 of the driving member 210 moves along the guide portion 221, so that the left driving member 210 rotates counterclockwise, and the connecting member 290 is pulled.

[0063] It should be noted that the orientation terms such as vertical, horizontal, left side, and right side used in the description of the unlocking structure 200 above are for ease of understanding and refer to the situation where the unlocking structure 200 is provided on a horizontal segment in the horizontal direction of the handlebar 410. In other embodiments, the unlocking structure 200 may be provided on other locations, for example, on a vertical or curved portion of the handlebar 410, and the orientation of the unlocking structure 200 will change accordingly.

[0064] According to the unlocking structure 200 of the present invention, when a user grips the handlebar 410, he or she can pull the selection member 270 with one finger (e.g., the thumb) and simultaneously press the operating member 230 with the other fingers (e.g., the remaining four fingers), thereby enabling the user to operate multiple lock modules including the restriction structure 100 with only one hand.

[0065] It should be understood that in other embodiments, the unlocking structure 200 may be configured in any other suitable form, such as a toggle lever, a cam, or an electric actuator, as long as it can pull the connecting member 290 in response to a user's operation.

[0066] A restriction structure 500 according to a second embodiment of the present invention will be described with reference to Figures 14 to 16. The restriction structure 200 of the first embodiment and the restriction structure 500 of the second embodiment can be applied to a wheeled transportation device either individually or in common.

[0067] In the second embodiment, the wheeled transportation device 1 includes a pair of wheels 300 (e.g., rear wheels), with a limiting structure 500 provided between the two wheels 300. The limiting structure 500 includes a first housing 510, a second housing 520, an interlocking member 530, and an interlocking shaft 540. The first housing 510 and the second housing 520 may be similar to the first housing 110 and the second housing 120 of the first embodiment. The interlocking member 530 is connected between the two second housings 520, thereby allowing the two second housings 520 to rotate synchronously around their respective directional axes A. The interlocking member 530 can limit the rotation range of the wheels 300. If the wheels 300 rotate excessively (e.g., attempting to rotate to a forward position), the interlocking member 510 will interfere with the corresponding second housing 520, preventing further rotation of the wheels 300.

[0068] In one embodiment, the linkage members 530 are laterally extending rods that are connected to the respective second housings 520 via linkage shafts 540 that are parallel to the directional axis A. In other embodiments, the linkage members 510 may be in other suitable forms, such as in the form of a wire.

[0069] A third embodiment of the present invention will be described with reference to FIGS.

[0070] In the third embodiment, the limiting structure 100 is directly connected to the wheel 300, and therefore the wheel seat 310 is omitted. As shown in Fig. 18, the second housing 120 in the limiting structure 100 includes a connecting seat 128 extending in an oblique direction, and the connecting seat 128 is connected to an axle (not shown) of the wheel 300, thereby rotatably connecting to the wheel 300. In this embodiment, the connecting seat 128 is a bifurcated portion extending on both sides of the wheel 300, but in other embodiments, the connecting seat 128 has any appropriate shape that rotatably connects the wheel 300 to the second housing 120.

[0071] It should be understood that although the first embodiment shows a dual wheel structure (each limiting structure 100 is connected to two wheels 300) and the third embodiment shows a single wheel structure (each limiting structure 100 is connected to two wheels 300), both the first and third embodiments may be applied to either a dual wheel structure or a single wheel structure.

[0072] As described above, the present invention provides a wheeled transportation device having a restriction structure that can avoid risks caused by free rotation of the wheels by restricting the rotation range of the wheels in response to user operation.

[0073] Since the present application can be specifically implemented in various forms without departing from the spirit and substance of the present application, the above embodiments should not be limited to the above details, but should be interpreted in the broadest possible manner within the scope defined by the claims, and all changes that fall within the scope of the claims or their equivalents should be covered by the claims.

Claims

1. A wheeled transportation device comprising a frame body, at least one wheel, and a limiting structure, The at least one wheel is provided below the frame body and is rotatable about a directional axis relative to the frame body; the limiting structure is provided between the frame body and the wheel, the limiting structure being operable to limit a range of directional rotation of the wheel; A wheeled transportation device characterized by:

2. The restriction structure is a first housing connected to the frame body; a second housing connected to the wheel and rotatable about the pointing axis relative to the first housing; The limiting structure is provided to limit a range of rotation between the first housing and the second housing.

2. The wheeled transportation device according to claim 1.

3. The first housing is provided with a first limiting portion, and the second housing is provided with a second limiting portion, the first limiting portion is operably engaged with the second limiting portion to limit a range of rotation between the first housing and the second housing; 3. The wheeled transportation device according to claim 2.

4. the wheel is at least one rear wheel, and the limiting structure prevents the rear wheel from rotating into a forward position; 4. A wheeled transportation device according to claim 1, wherein the wheeled transportation device is a wheeled transportation device.

5. one of the first limiting portion and the second limiting portion is a pin that can move toward or away from the other of the first limiting portion and the second limiting portion; the other of the first limiting portion and the second limiting portion is a recessed groove extending around the pointing axis, the first limiting portion is operably moved and inserted into the second limiting portion so as to limit a rotation range between the first housing and the second housing according to an extension range of the second limiting portion; 5. A wheeled transport device according to claim 4 in any combination with claim 3.

6. The pin moves in a direction generally parallel to the pointing axis.

6. The wheeled transportation device according to claim 5.

7. the second limiting portion is provided on the other of the first housing and the second housing, and is located at an interface where the first housing and the second housing are adjacent to each other.

7. A wheeled transportation device according to claim 5 or 6.

8. a lock hole is further formed in the second limiting portion, and the first limiting portion is insertable into the lock hole to prevent relative rotation between the first housing and the second housing; A wheeled transportation device according to any one of claims 4 to 7 in any combination with claim 3.

9. The lock hole is opened at the circumferential center of the second limiting portion.

9. The wheeled transportation device according to claim 8.

10. The groove is arc-shaped and has an extension range of 300°. A wheeled transportation device according to any one of claims 6 to 9 in any combination with claim 5.

11. the first limiting portion is connected to an unlocking structure via a connecting member, the unlocking structure being operable to move the first limiting portion away from the second limiting portion via the connecting member; A wheeled transportation device according to any one of claims 6 to 10 in any combination with claim 3.

12. the unlocking structure includes a drive member, an operation member, and a moving member, the drive member is connected to a first end of the connecting member and is rotatable to pull the connecting member; the operating member is operable to move from outside the wheeled transportation device; the moving member is engaged with the operating member and is capable of driving the rotation of the driving member in response to the movement of the operating member; 12. The wheeled transportation device according to claim 11.

13. a second end of the connecting member is connected to the first limiting portion, and when the connecting member is pulled, the connecting member separates the first limiting portion from the second limiting portion; 13. The wheeled transportation device according to claim 12.

14. the operating member is provided on a handlebar of the wheeled transportation device and is movable perpendicularly to the handlebar; the operating member has a contact portion formed to protrude toward the inside of the handlebar, the contact portion contacting the moving member, a guide portion is formed on the side of the moving member facing the drive member, and a protrusion portion that rises along the rotation axis of the drive member is provided around the drive member, and the guide portion is capable of contacting the protrusion portion so that the guide portion contacts the protrusion portion and causes the drive member to rotate when the moving member is driven to move by the movement of the operating member; 14. A wheeled transportation device according to claim 12 or 13.

15. The unlocking structure includes two driving members, one of which drives the limiting structure via the connecting member, and the other of which drives the lock module via the other connecting member; the unlocking structure includes two moving members, each of which corresponds to one of the two driving members and can drive the corresponding driving members; The operating member is provided so as to be able to selectively come into contact with one of the two moving members. A wheeled transportation device according to any one of claims 12 to 14.

16. The lock release structure further includes a selection member operable to cause one of the two moving members to interlock with the operating member, such that the moving member interlocked with the operating member is pressed by the operating member to drive the corresponding driving member.

16. The wheeled transportation device according to claim 15.

17. The limiting structure is connected to the wheel via a wheel seat, the wheel seat is movable along a longitudinal direction relative to the limiting structure, and a buffer spring is provided between the limiting structure and the wheel seat. A wheeled transportation device according to any one of claims 1 to 16.

18. The wheeled transportation device is a stroller or a pet cart. A wheeled transportation device according to any one of claims 1 to 17.

19. A wheeled transportation device comprising a frame body, two wheels, and a limiting structure, The two wheels are provided below the frame body and are rotatable around a directional axis relative to the frame body; the limiting structure is disposed between the two wheels and operably limits the range of directional rotation of the wheels; A wheeled transportation device characterized by:

20. the limiting structure includes two first housings, two second housings, and an interlocking member; the two first housings are respectively connected to the frame body; the two second housings are respectively connected to the two wheels and are respectively rotatable about the pointing axis relative to the two first housings; The interlocking member is connected to the two second housings to rotate the two second housings synchronously around their respective directional axes.

20. The wheeled transportation device of claim 19.

21. the linking members are rods extending laterally and connected to the second housings by linking shafts parallel to the directional axis; The interlocking member and the first housing interfere with each other to limit the rotation range of the second housing.

21. The wheeled transportation device of claim 20.

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