Foldable wheel structure and trolley

Abstract

The utility model provides a foldable wheel structure and a trolley, and the wheel structure comprises a connecting seat, a wheel seat, the lower part of which is provided with a walking wheel, the upper part of which is rotatably connected to the connecting seat and has the following two states: a folding state in which the wheel seat is turned upward relative to the connecting seat, and an unfolding state in which the wheel seat is turned downward relative to the connecting seat, the upper part of the wheel seat is provided with an arc-shaped slot hole extending along the rotating direction of the wheel seat, the connecting seat is provided with a pin shaft inserted into the arc-shaped slot hole and capable of moving along the arc-shaped slot hole, when the wheel seat is in the folding state, the pin shaft moves to the first end of the arc-shaped slot hole, and when the wheel seat is in the unfolding state, the pin shaft moves to the second end of the arc-shaped slot hole, further comprising a locking piece for locking the pin shaft and the arc-shaped slot hole so that the pin shaft is located at the first end or the second end of the arc-shaped slot hole, and an operating piece for controlling the pin shaft to switch between the first end and the second end of the arc-shaped slot hole, and the utility model can improve the structural stability before and after folding.

Description

Technical Field

[0001] This utility model belongs to the field of walking vehicle technology, specifically relating to a foldable wheel structure and a storage vehicle. Background Technology

[0002] Existing foldable wheel structures, such as the structure disclosed in Chinese Utility Model Patent Application No. CN202020871834.0 entitled "A Wheel Folding Device and a Handcart" (Authorization Announcement No. CN213323295U), include a base, a worm gear, a worm meshing with the worm gear, a rotating shaft, and a wheel seat for mounting the wheel. The base is provided with a power component for driving the worm gear to rotate; the rotating shaft passes through the worm gear and is fixedly connected to the worm gear; the wheel seat and the rotating shaft are fixed, and the rotating shaft can be driven to rotate through the cooperation of the worm gear and the worm gear, thereby driving the wheel seat to rotate.

[0003] For example, the Chinese utility model patent with application number CN201821606273.0, entitled "Wheel Flipping Structure of Folding Baby Stroller" (authorization announcement number CN209064172U), includes a bracket, a rotating seat whose upper part is pivotally connected to the lower part of the bracket and whose lower part is connected to a wheel, and a connecting rod rotatably connected to the bracket; it also includes a sliding seat that can be slidably connected to the bracket along the length direction of the bracket, a first elastic member that applies force to the sliding seat to make it slide, and a second elastic member that applies force to the rotating seat to make it pivot relative to the bracket. The connecting rod has a locking part that can be disengaged from the sliding seat. When the locking part abuts against the sliding seat, the force it applies to the sliding seat is opposite in direction to the force applied by the first elastic member. The sliding seat and the rotating seat can be disengaged from each other. When the sliding seat and the rotating seat are in contact, the force it applies to the rotating seat is opposite in direction to the force applied by the second elastic member.

[0004] The structural stability of existing wheel structures before and after folding needs to be further improved to prevent accidental overturning and folding of the wheel structure.

[0005] Meanwhile, most of the storage carts on the market only have the function of pushing / pulling a cart for storing items. If you want to also have the function of a trailer that can be connected to a bicycle and move forward with the bicycle, you usually have to remove the front wheel of the storage cart, which is quite inconvenient. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a foldable wheel structure in view of the current state of the technology, so as to improve the structural stability before and after folding.

[0007] The second technical problem to be solved by this utility model is to provide a storage vehicle with the above-mentioned wheel structure, so that the storage vehicle can have both push / pull vehicle function and trailer function, and it is easy to switch between the two functions.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a foldable wheel structure, comprising:

[0009] Connector for connecting the main body of the vehicle frame;

[0010] The wheel seat has a lower part equipped with a traveling wheel that can rotate around its own axis, and its upper part is rotatably connected to the connecting seat, and has the following two states:

[0011] The wheel seat is flipped upward relative to the connecting seat, causing the walking wheel to be in a folded state that is off the ground;

[0012] The wheel seat is flipped downward relative to the connecting seat so that the walking wheel can be supported on the ground in an unfolded state;

[0013] Its features are:

[0014] The upper part of the wheel seat is provided with an arc-shaped slot extending along the rotation direction of the wheel seat. The connecting seat is provided with a pin that is inserted into the arc-shaped slot and can move along the arc-shaped slot. When the wheel seat is in a folded state, the pin moves to the first end of the arc-shaped slot. When the wheel seat is in an unfolded state, the pin moves to the second end of the arc-shaped slot.

[0015] It also includes:

[0016] A locking component used to lock the pin to the arc-shaped slot so that the pin is at the first end or the second end of the arc-shaped slot;

[0017] An operating component used to control the switching of the pin between the first and second ends of the arc-shaped slot.

[0018] By utilizing the interlocking mechanism between the arc-shaped slot on the wheel seat and the pin on the connecting seat, along with the design of the locking and operating components, when the wheel seat is folded up relative to the connecting seat, the pin moves to the first end of the arc-shaped slot and is locked by the locking component. When the wheel is unfolded relative to the connecting seat, the pin moves to the second end of the arc-shaped slot and is locked by the locking component. This ensures that the wheel structure is relatively stable before and after folding, and the operating components allow the wheel structure to switch between folded and unfolded states.

[0019] Furthermore, the combination of the arc-shaped slot and the pin can effectively control the rotation angle of the wheel seat.

[0020] Preferably, the arc-shaped slot has:

[0021] The main body is curved;

[0022] The first radial portion extends radially in an arc shape from the first end of the main body, and the first radial portion is the first end of the arc-shaped slot.

[0023] The second radial portion extends radially in an arc shape from the second end of the main body, and the second radial portion is the second end of the arc-shaped slot.

[0024] The locking element includes an elastic element that acts on the pin to make the pin always tend to move into the first radial portion or the second radial portion of the arc-shaped slot.

[0025] The operating element is used to control the pin to move into the main body portion against the elastic force of the elastic element.

[0026] When the pin is in the first radial part or the second radial part, the wheel seat cannot be rotated relative to the connecting seat. The pin needs to be disengaged from the first radial part or the second radial part by the operating member so that the wheel seat can be rotated relative to the connecting seat, and then the pin can move along the main body.

[0027] Preferably, the central angle corresponding to the arc of the main body is 90 degrees, so that the first radial portion and the second radial portion are perpendicular. That is, the rotation angle of the wheel seat is 90 degrees.

[0028] Preferably, the main body of the arc-shaped slot arches upward, and when the wheel seat is in a folded state, the first end of the arc-shaped slot extends upward, and when the wheel seat is in an unfolded state, the second end of the arc-shaped slot extends upward.

[0029] Furthermore, the operating element is a button located on the connecting seat and capable of moving up and down relative to the connecting seat. The button is constrained together with the pin, and the button always has an upward tendency under the action of the elastic element. The button is designed for easy operation, and the cooperation between the button, the pin, and the arc-shaped slot allows the pin to automatically enter the corresponding first radial portion or second radial portion for locking after the wheel seat is flipped into place.

[0030] Preferably, the button is connected to a connecting post extending downward relative to the button, the pin is horizontally disposed at the lower end of the connecting post, and the elastic element is a spring sleeved on the outer periphery of the connecting post, with the upper end of the spring contacting the button.

[0031] In the above embodiments, preferably, the traveling wheels are arranged horizontally when the wheel seats are in the folded state. Of course, the traveling wheels may also be slightly tilted relative to the horizontal direction.

[0032] In the above solutions, preferably, the connecting seat is provided with a first limiting part, and the wheel seat is provided with a second limiting part;

[0033] When the wheel seat is in a folded state, the first limiting part is adjacent to the second limiting part and the two can be constrained together.

[0034] When the wheel seat is in the unfolded state, the first limiting part and the second limiting part separate. The cooperation of the first limiting part and the second limiting part makes the wheel structure more stable in the folded state.

[0035] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a storage cart, including a frame body, characterized in that it also has a wheel structure as described above, wherein the connecting seat of the wheel structure is disposed at the bottom of the frame body.

[0036] Preferably, with the forward direction of the frame body as the front side, the wheel structure is located on the front side of the frame body, and a wheel that can rotate around a left-right extending axle is fixedly installed on the rear side of the frame body. This allows the storage cart of this invention to also function as a trailer connected to a bicycle. In this case, the wheel structure is folded to avoid contact with the ground, the wheels are supported on the ground, and the storage cart moves forward with the bicycle.

[0037] Compared with the prior art, the advantages of this utility model are as follows: through the cooperation between the arc-shaped slot on the wheel seat and the pin on the connecting seat, as well as the design of the locking and operating components, when the wheel seat is flipped upward relative to the connecting seat and is in a folded state, the pin moves to the first end of the arc-shaped slot and is locked under the action of the locking component. When the wheel is flipped downward relative to the connecting seat and is in an unfolded state, the pin moves to the second end of the arc-shaped slot and is locked under the action of the locking component. This makes the wheel structure more stable before and after folding, and the operating component can realize the switching between the folded and unfolded states of the wheel structure.

[0038] Furthermore, the combination of the arc-shaped slot and the pin can effectively control the rotation angle of the wheel seat. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the storage cart according to an embodiment of the present utility model;

[0040] Figure 2 This is a schematic diagram of the wheel structure in the unfolded state according to an embodiment of the present invention;

[0041] Figure 3 for Figure 2 Top view of the wheel structure;

[0042] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0043] Figure 5This is a top view of the wheel structure of this utility model embodiment between the unfolded state and the folded state;

[0044] Figure 6 for Figure 5 Sectional view along the BB direction;

[0045] Figure 7 This is a top view of the wheel structure in the folded state according to an embodiment of the present invention;

[0046] Figure 8 for Figure 7 A cross-sectional view along the CC direction;

[0047] Figure 9 for Figure 1 3D exploded view of the wheel structure. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] like Figures 1-9 As shown, this is a preferred embodiment of a foldable wheel structure and a storage cart according to the present invention. The wheel structure includes a connecting seat 1, a wheel seat 2, a locking member 3, and an operating member 4.

[0050] The connecting seat 1 is used to connect the frame body 5. The connection methods include, but are not limited to, screw connection, welding, etc.

[0051] The lower part of the wheel seat 2 is provided with a traveling wheel 20 that can rotate around its own axis. The upper part of the wheel seat 2 is rotatably connected to the connecting seat 1 and has the following two states:

[0052] The wheel seat 2 flips upward relative to the connecting seat 1, causing the traveling wheel 20 to fold away from the ground. At this time, as... Figure 8 As shown, the 20 traveling wheels are arranged horizontally;

[0053] The wheel seat 2 is flipped downwards relative to the connecting seat 1, allowing the traveling wheel 20 to be supported on the ground in an unfolded state. At this time, as... Figure 2 , 4 As shown, the walking wheels 20 are arranged vertically.

[0054] The wheel seat 2, which is in the unfolded state, is rotated upwards by 90° to the folded state.

[0055] The upper part of the wheel seat 2 is provided with an arc-shaped slot 21 extending along the rotation direction of the wheel seat 2. The connecting seat 1 is provided with a pin 11 inserted into the arc-shaped slot 21 and movable along the arc-shaped slot 21. When the wheel seat 2 is in the folded state, the pin 11 moves to the first end 211 of the arc-shaped slot 21. When the wheel seat 2 is in the unfolded state, the pin 11 moves to the second end 212 of the arc-shaped slot 21. Specifically, the arc-shaped slot 21 has an arc-shaped main body 21a, a first radial part 21b extending radially along the arc from the first end of the main body 21a, and a second radial part 21c extending radially along the arc from the second end of the main body 21a. The first radial part 21b is the first end 211 of the arc-shaped slot 21, and the second radial part 21c is the second end 212 of the arc-shaped slot 21. The main body 21a arches upward, and the central angle corresponding to the arc of the main body 21a is 90 degrees, so that the first radial part 21b and the second radial part 21c are perpendicular to each other. When the wheel seat 2 is in the folded state, the first end 211 of the arc-shaped slot 21 extends upward, and when the wheel seat 2 is in the unfolded state, the second end 212 of the arc-shaped slot 21 extends upward.

[0056] The locking member 3 is used to lock the pin 11 to the arc-shaped slot 21, so that the pin 11 is located at the first end 211 or the second end 212 of the arc-shaped slot 21. The operating member 4 is used to control the pin 11 to switch between the first end 211 and the second end 212 of the arc-shaped slot 21. Specifically, the operating member 4 is a button 40 provided on the connecting seat 1 and capable of moving up and down relative to the connecting seat 1. The button 40 is connected to a connecting post 41 extending downward relative to the button 40. The pin 11 is horizontally arranged at the lower end of the connecting post 41 and can move up and down together with the connecting post 41 and the button 40. The locking member 3 includes an elastic member 31, which is a spring sleeved on the outer periphery of the connecting post 41. The upper end of the spring contacts the button 40 so that the button 40 always has an upward tendency.

[0057] Meanwhile, the connecting seat 1 is provided with a first limiting part 12, and the wheel seat 2 is provided with a second limiting part 22; when the wheel seat 2 is in the folded state, the first limiting part 12 is adjacent to the second limiting part 22 and the two can be constrained together; when the wheel seat 2 is in the unfolded state, the first limiting part 12 and the second limiting part 22 are separated. The first and second limiting parts can be made of matching limiting screws, limiting holes, or snap-fit ​​structures, etc.

[0058] like Figures 2-4 As shown, in the unfolded state, the pin 11 is lifted into the second radial part 21c of the arc-shaped slot 21 under the action of the elastic element 31, which prevents the wheel seat from rotating relative to the connecting seat, thereby achieving overall locking of the wheel structure. The trolley can be moved on the ground as a push / pull trolley.

[0059] like Figure 5 ,6 As shown, when the wheel structure needs to be folded, manually press the button 40 on the top, which will cause the pin 11 to overcome the elastic force of the elastic element and slide out of the second radial part 21c of the arc-shaped slot 21 and enter the second end of the main body part 21a of the arc-shaped slot 21. At this time, rotate the wheel seat, and the pin 11 will move along the main body part 21a to the first end of the main body part 21a.

[0060] like Figure 7 , 8 As shown, when the pin 11 moves along the main body 21a to the first end of the main body 21a, the force of the elastic element will pull the pin 11 upward again into the first radial part 21b of the arc-shaped slot 21. At this time, the pin 11 cannot move circumferentially along the arc-shaped slot 21, thereby achieving the locking of the entire wheel structure after folding.

[0061] like Figure 1 As shown, the storage cart of this utility model includes a frame body 5 and a wheel structure located at the bottom of the frame body 5. Taking the forward direction of the frame body 5 as the front side, there are two sets of wheel structures, one on the left and one on the right of the front side of the frame body 5. A wheel 51 that can rotate around a left-right extending pivot is fixedly installed on the rear side of the frame body 5. The wheel 51 is prior art and will not be described in detail here.

[0062] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0063] The term "radial" is also used in the specification and claims of this utility model, meaning basically along the inside and outside direction, and is not limited to the radial direction that passes through the center of the circle, but can also be slightly deviated from the radial direction.

Claims

1. A foldable wheel structure, comprising: Connecting seat (1) for connecting the frame body (5); The wheel seat (2) has a lower part equipped with a traveling wheel (20) that can rotate around its own axis, and its upper part is rotatably connected to the connecting seat (1), and has the following two states: The wheel seat (2) is flipped upward relative to the connecting seat (1) so that the walking wheel (20) is in a folded state that is off the ground; The wheel seat (2) is flipped downward relative to the connecting seat (1) so that the walking wheel (20) can be supported on the ground in an unfolded state; Its features are: The upper part of the wheel seat (2) is provided with an arc-shaped slot (21) extending along the rotation direction of the wheel seat (2). The connecting seat (1) is provided with a pin (11) inserted into the arc-shaped slot (21) and movable along the arc-shaped slot (21). When the wheel seat (2) is in a folded state, the pin (11) moves to the first end (211) of the arc-shaped slot (21). When the wheel seat (2) is in an unfolded state, the pin (11) moves to the second end (212) of the arc-shaped slot (21). It also includes: A locking member (3) for locking the pin (11) to the arc-shaped slot (21) so that the pin (11) is at the first end (211) or the second end (212) of the arc-shaped slot (21); An operating element (4) is used to control the switching of the pin (11) between the first end (211) and the second end (212) of the arc-shaped slot (21).

2. The wheel structure according to claim 1, characterized in that: The arc-shaped slot (21) has the following characteristics: The main body is curved (21a); A first radial portion (21b) extends radially in an arc shape from the first end of the main body portion (21a) and is the first end portion (211) of the arc-shaped slot (21). A second radial portion (21c) extends radially in an arc shape from the second end of the main body portion (21a), and the second radial portion (21c) is the second end portion (212) of the arc-shaped slot (21); The locking member (3) includes an elastic member (31) that acts on the pin (11) so that the pin (11) always tends to move into the first radial portion (21b) or the second radial portion (21c) of the arc-shaped slot (21); The operating element (4) is used to control the pin (11) to move into the main body (21a) against the elastic force of the elastic element (31).

3. The wheel structure according to claim 2, characterized in that: The central angle corresponding to the arc of the main body (21a) is 90 degrees, so that the first radial part (21b) and the second radial part (21c) are perpendicular to each other.

4. The wheel structure according to claim 3, characterized in that: The main body (21a) of the arc-shaped slot (21) arches upward. When the wheel seat (2) is in a folded state, the first end (211) of the arc-shaped slot (21) extends upward. When the wheel seat (2) is in an unfolded state, the second end (212) of the arc-shaped slot (21) extends upward.

5. The wheel structure according to claim 4, characterized in that: The operating element (4) is a button (40) located on the connecting seat (1) and capable of moving up and down relative to the connecting seat (1). The button (40) is constrained together with the pin (11), and the button (40) always has an upward tendency under the action of the elastic element (31).

6. The wheel structure according to claim 5, characterized in that: The button (40) is connected to a connecting post (41) extending downward relative to the button (40). The pin (11) is horizontally arranged at the lower end of the connecting post (41). The elastic element (31) is a spring sleeved on the outer periphery of the connecting post (41), and the upper end of the spring is in contact with the button (40).

7. The wheel structure according to any one of claims 1 to 6, characterized in that: When the wheel seat (2) is in the folded state, the walking wheel (20) is arranged horizontally.

8. The wheel structure according to any one of claims 1 to 6, characterized in that: The connecting seat (1) is provided with a first limiting part (12), and the wheel seat (2) is provided with a second limiting part (22); When the wheel seat (2) is in a folded state, the first limiting part (12) is adjacent to the second limiting part (22) and the two can be constrained together; When the wheel seat (2) is in the unfolded state, the first limiting part (12) and the second limiting part (22) separate.

9. A storage cart, comprising a frame body (5), characterized in that... It also has a wheel structure as described in any one of claims 1 to 8, wherein the connecting seat (1) of the wheel structure is located at the bottom of the frame body (5).

10. The storage cart according to claim 9, characterized in that: With the forward direction of the frame body (5) as the front side, the wheel structure is located on the front side of the frame body (5), and a wheel (51) that can rotate around a left-right extending pivot is fixedly installed on the rear side of the frame body (5).

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