A cart

Abstract

The application discloses a cart, which comprises a frame capable of being converted between an unfolded state and a folded state, the frame comprising a handle, a front leg, a rear leg, a support, a first linkage and a second linkage; the lower side of the handle is pivotally connected with the rear leg, and the rear side of the front leg is also pivotally connected with the rear leg; the upper side of the first linkage is pivotally connected with the handle, and the lower side is pivotally connected with the support, and the support is also pivotally connected with the front leg; the upper side of the second linkage is pivotally connected with the handle, and the lower side is pivotally connected with the front leg. When the frame of the cart is to be folded, the handle is only needed to be rotated downwardly and rearwardly, and other components of the frame are all linked and rotated to be completely folded, so that the folding operation is convenient; and after being folded, the components of the frame are relatively close to each other, so that the overall volume is small, and the cart is convenient to carry and store.

Description

Technical Field

[0001] This invention relates to the field of stroller products, and more particularly to a stroller. Background Technology

[0002] Strollers are becoming increasingly common in daily life. When paired with a child seat or child sleeping box, a stroller can be used as a children's stroller, allowing parents to take their children out. When paired with a pet basket, a stroller can be used as a pet stroller. With more and more people keeping pets, using a stroller to take pets out has become much more convenient for pet owners.

[0003] Whether it's a stroller for children or a stroller for pets, the frame is usually designed to be foldable to make it more convenient to use. This is because the folded frame is smaller than the unfolded frame, making it easier to carry (e.g., in a car, on a boat, etc.). Also, when not in use, the folded frame takes up less space at home than when unfolded.

[0004] Currently, there are various styles of stroller frame structures on the market. However, some stroller frames cannot be fully linked when folding, requiring multiple operations to fold different components, which makes the folding operation complicated. Some frames are still not small enough when folded, making them inconvenient to move or carry. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a trolley in which all components can be linked together when the frame is folded, thus making the folding operation simple and the size small after folding.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A trolley includes a frame that can be switched between an unfolded state and a folded state. The frame includes a push handle, a front leg, a rear leg, a support member, a first linkage member, and a second linkage member. The lower side of the push handle is pivotally connected to the rear leg, and the rear side of the front leg is also pivotally connected to the rear leg. The upper side of the first linkage member is pivotally connected to the push handle, and the lower side is pivotally connected to the support member. The support member is also pivotally connected to the front leg. The upper side of the second linkage member is pivotally connected to the push handle, and the lower side is pivotally connected to the front leg.

[0008] The lower side of the push handle is pivotally connected to the rear foot around a pivot axle one, and the upper side of the second linkage rotates around a pivot axle two. When the frame is in the unfolded state, the pivot axle two is located below the pivot axle.

[0009] The front foot is pivotally connected to the rear foot around pivot three, and the lower side of the second linkage rotates around pivot four and is connected to the front foot. When the frame is in the unfolded state, pivot four is located behind or above pivot three.

[0010] The upper side of the first linkage is pivotally connected to the push handle around the pivot five. When the frame is in the unfolded state, the pivot five is located above the pivot one.

[0011] The support member is pivotally connected to the front foot around pivot six, and the lower side of the first linkage member is pivotally connected to the support member around pivot seven. When the frame is in the unfolded state, pivot six is ​​located in front of pivot seven; preferably, pivot six is ​​located in front of pivot three.

[0012] The frame also includes a connector, the upper side of which is fixedly connected to the support member, and the lower side of which is pivotally connected to the front foot; preferably, the lower side of the connector is pivotally connected to the front foot rotatably around a pivot.

[0013] A connecting seat is fixedly connected to the front side of the rear foot, and a pivot seat is fixedly connected to the lower side of the push handle. The pivot seat is pivotally connected to the connecting seat. A blocking part protrudes from the rear side of the connecting seat. When the frame is in the unfolded state, the rear side of the lower side of the pivot seat abuts against the front side of the blocking part. Preferably, at least part of the rear side of the second linkage also abuts against the front side of the blocking part.

[0014] An elastic reset member is provided between any two of the push handle, front foot, rear foot, support member, first linkage member, and second linkage member, and the elastic reset member is in a tensioned state when the frame is in the unfolded state.

[0015] The connecting seat and the pivot seat are respectively provided with a first groove and a second groove on opposite sides. One of the first grooves and the second groove has a first insertion hole eccentrically provided on its bottom wall, and the other groove has a protrusion on its bottom wall. The protrusion includes a first section protruding from the bottom wall of the other groove and a second section extending from the middle of the first section. The diameter of the first section is larger than that of the second section. A second insertion hole is provided on the end wall of the second section facing one of the grooves. The torsion spring is sleeved on the second section, with one end of the torsion spring inserted into the first insertion hole and the other end inserted into the second insertion hole.

[0016] The frame is also equipped with a frame locking mechanism that can lock it in the unfolded state. The first slot is configured as a first toothed slot, and the second slot is configured as a second toothed slot. The locking mechanism includes a gear that is relatively movably connected to the first toothed slot and the second toothed slot, and an elastic element disposed between the pivot seat or connecting seat and the gear. The gear is sleeved on the boss, and the inner diameter of the gear is larger than the outer diameter of the torsion spring. Under the action of the elastic element, the gear simultaneously meshes with the first toothed slot and the second toothed slot, and the frame locking mechanism is in the locked state.

[0017] The rear foot is connected to the lower part of the rear wheel, and the frame is configured such that, in the folded state, the rear wheel and the lower end of the upper push handle or / and the lower end of the lower push handle are supported on the support surface.

[0018] The support member is configured to be connected to a pet basket, child seat, or child sleeping box; preferably, the stroller also includes a pet basket, child seat, or child sleeping box, which is connected to the support member.

[0019] Because the present invention adopts the above-described technical solution, it has the following beneficial effects:

[0020] 1. When closing, simply rotate the push handle backward and downward, and all other components of the frame will rotate in conjunction to fully close the frame, making the closing operation convenient;

[0021] 2. When folded, the various components of the frame are relatively close together, resulting in a small overall size that is easy to carry and store;

[0022] 3. The elastic reset component ensures that when the frame is retracted, its restoring force causes all components of the frame to rotate automatically, resulting in the entire frame retracting. This makes the retraction and retraction operation more convenient and effortless. One end of the torsion spring is inserted into...

[0023] 4. After being folded, the rear wheel and the lower end of the upper push handle or / and the lower end of the lower push handle are supported on the support surface, so that the frame is in an upright position after being folded, which facilitates the moving operation after being folded.

[0024] 5. Because when the frame is folded up, the support for connecting the pet basket, child seat, or child sleeping box is folded up together with the other components of the frame, it is equivalent to the pet basket, child seat, or child sleeping box being folded up together with the other components of the frame when the frame is folded up, making the overall folding operation of the stroller of the present invention simpler. Attached Figure Description

[0025] Figure 1 This is a plan view of the trolley frame of the present invention in its unfolded state;

[0026] Figure 2 This is a three-dimensional schematic diagram of the trolley frame of the present invention in its unfolded state;

[0027] Figure 3 According to Figure 2 A magnified diagram of the explosion in section A;

[0028] Figure 4 This is a plan view of the trolley frame of the present invention during the folding process;

[0029] Figure 5 This is a three-dimensional schematic diagram of the trolley frame of the present invention during the folding process;

[0030] Figure 6 According to Figure 5 An enlarged schematic diagram of section C;

[0031] Figure 7 This is a plan view of the trolley frame of the present invention after it is folded up;

[0032] Figure 8 This is a three-dimensional schematic diagram of the trolley frame of the present invention after it is folded up;

[0033] Figure 9 According to Figure 8 A magnified view of part D from another angle;

[0034] Figure 10 According to Figure 2 A magnified diagram of the explosion in section B;

[0035] Figure 11 An enlarged view showing the assembly of the pivot, gear, and torsion spring;

[0036] Figure 12 This is a three-dimensional schematic diagram of the stroller frame and pet basket combined according to the present invention. Detailed Implementation

[0037] like Figures 1 to 8 As shown, the present invention discloses a trolley, which includes a frame 100 that can be switched between an unfolded state and a folded state. The frame 100 includes a push handle 1, a front leg 2, a rear leg 3, a support member 4, a first linkage member 5, and a second linkage member 6. The lower side of the push handle 1 is pivotally connected to the rear leg 3, and the rear side of the front leg 2 is also pivotally connected to the rear leg 3. The upper side of the first linkage member 5 is pivotally connected to the push handle 1, and the lower side is pivotally connected to the support member 4. The support member 4 is also pivotally connected to the front leg 2. The upper side of the second linkage member 6 is pivotally connected to the push handle 1, and the lower side is pivotally connected to the front leg 2.

[0038] The lower side of the push handle 1 is pivotally connected to the rear foot 3 around the pivot 10, and the upper side of the second linkage 6 is rotatably connected to the push handle 1 around the pivot 61. When the frame is in the unfolded state, the pivot 61 is located below the pivot 10.

[0039] The front foot 2 is pivotally connected to the rear foot 3 around the pivot 3 21, and the lower side of the second linkage 6 rotates around the pivot 4 62 and is rotated with the front foot 2. When the frame is in the unfolded state, the pivot 4 62 is located behind or above the pivot 3 21.

[0040] The upper side of the first linkage 5 is pivotally connected to the push handle 1 around the pivot 51. When the frame is in the unfolded state, the pivot 51 is located on the upper side of the pivot 10.

[0041] The support member 4 is pivotally connected to the front foot 2 about the pivot 41, and the lower side of the first linkage member 5 is pivotally connected to the support member 4 about the pivot 52. When the frame is in the unfolded state, the pivot 41 is located in front of the pivot 52. The pivot 41 is also located in front of the pivot 21.

[0042] In this embodiment, preferably, the frame further includes a connector 40. The upper side of the connector 40 is fixedly connected to the support member 4, and the lower side is pivotally connected to the front leg 2. That is, the purpose of the support member 4 being pivotally connected to the front leg 2 through the connector 40 is that the lower side of the connector 40 is pivotally connected to the front leg 2 rotatably around the pivot 41. With this arrangement, compared to the connector 40 being directly pivotally connected to the front leg 2, the support member 4 can be positioned at a relatively high position.

[0043] like Figure 4 , 5 As shown, when the frame of this invention is to be folded, the push handle 1 is rotated downwards and backwards. The upper side of the first linkage 5 is moved and rotated downwards, thereby pushing the rear side of the support 4 to rotate downwards and backwards, causing the front side of the support 4 to rotate upwards relative to the front foot 2. At the same time, the lower side of the push handle 1 rotates upwards and forwards, thereby pulling the upper side of the second linkage 6 to rotate upwards and forwards. Thus, the lower side of the second linkage 6 pulls the upper side of the front foot 2 to rotate forwards, causing the lower side of the front foot 2 to rotate towards the rear foot 3. Since the support 4 is pivotally connected to the front foot 2, the support 4 does not obstruct the rearward rotation of the lower side of the front foot 2. In this way, each component of the frame is rotated in conjunction with the push handle 1 as it rotates downwards and backwards, until the components of the frame can no longer rotate relative to each other, and the frame is folded up. Figure 7 , 8 As shown. When the frame is in the folded state, the push handle 1, front foot 2, rear foot 3, support member 4, first linkage member 5, and second linkage member 6 are all relatively close together, so that the overall size of the frame is small after folding, making it easy to carry and store.

[0044] In this embodiment, the front wheel 20 is configured to rotate 360 ​​degrees relative to the front foot 22 around a vertical axis, and a directional mechanism is provided between the front foot 22 and the front wheel 20. When the pet stroller is in the unfolded state, the directional mechanism can be used to lock the front wheel 20 in a state where it cannot rotate 360 ​​degrees relative to the front foot 22 around the vertical axis, or the directional mechanism can be unlocked to allow the front wheel 20 to rotate 360 ​​degrees relative to the front foot 22 around the vertical axis. In the folded state, the directional mechanism can be unlocked, allowing the front wheel 20 to rotate to a suitable angle relative to the front foot 22, thereby bringing the front foot 2 and front wheel closer to the rear foot 3, resulting in a smaller overall size of the folded frame 100. The directional mechanism and unlocking operation of the front wheel 20 can be any known and feasible structure, and are not the inventive point of this invention, therefore they will not be described in detail here.

[0045] Preferably, the push handle 1 includes a lower push handle 11 and an upper push handle 12, with the lower side of the upper push handle 12 pivotally connected to the lower push handle 11. When the frame is folded, the upper push handle 12 is rotated downwards to bring it closer to the lower push handle 11, thereby shortening the overall length of the push handle 1 and thus reducing the volume of the folded frame. In other embodiments, the lower side of the upper push handle 12 may be movably connected to the lower push handle 11, and when the frame is folded, the upper push handle 12 is moved downwards, which also shortens the overall length of the push handle 1.

[0046] Combination Figure 1 , 3 As shown in Figure 6, in this embodiment, a connecting seat 7 is fixedly connected to the front side of the rear foot 3, and a pivot seat 13 is fixedly connected to the lower side of the push handle 1. The pivot seat 13 is pivotally connected to the connecting seat 7, thereby realizing the pivot connection between the push handle 1 and the rear foot 3. A blocking part 71 protrudes from the rear side of the connecting seat 7. When the frame is in the unfolded state, the rear side 130 of the lower side of the pivot seat 13 abuts against the front side of the blocking part 71. With this arrangement, when the frame is in the unfolded state, the lower side of the push handle 1 cannot rotate backward, thereby making the frame more stable in the unfolded state, and thus making the use of the frame in the unfolded state safer. Preferably, when the frame is in the unfolded state, at least part of the rear side of the second linkage 6 also abuts against the front side of the blocking part 71, thereby further ensuring the safety of the frame in the unfolded state.

[0047] Preferably, an elastic reset member 8 is provided between any two of the push handle 1, front foot 2, rear foot 3, support member 4, first linkage member 5, and second linkage member 6, and the elastic reset member 8 is in a tensioned state when the frame is in the unfolded state. With this configuration, when the frame is folded up, when the push handle 1 is rotated backward and downward, the restoring force of the elastic reset member 8 will cause the other components of the frame 100 to automatically rotate in linkage, thereby folding up the entire frame, making the folding up and folding operation of the frame more convenient and effortless.

[0048] Combination Figure 2 , 10As shown, in this embodiment, the elastic reset member 8 is a torsion spring 8, with one end of the torsion spring 8 connected to the lower side of the push handle 1 and the other end connected to the rear foot 3. Further, one end of the torsion spring 8 is connected to the connecting seat 7, and the other end is connected to the pivot seat 13. Because the connecting seat 7 is fixedly connected to the rear foot 3, and the pivot seat 13 is fixed to the push handle 1, the connection between the torsion spring and the connecting seat 7 and the pivot seat 13 is the same as the connection between the torsion spring and the push handle 1 and the rear foot 3. When the frame is in the unfolded state, the torsion spring 8 is in a torsional tension state. When closing the frame, it is not necessary to rotate the push handle 1 all the way down until it is close to the rear foot 3; simply rotating the push handle 1 slightly downwards and backwards will automatically allow the restoring force of the torsion spring 8 to continue driving the push handle 1 to continue rotating downwards and backwards, thus rotating other components of the frame until the frame is closed. This makes the closing operation of the frame simpler.

[0049] The connecting seat 7 and the pivot seat 13 are respectively provided with a first groove 72 and a second groove 131 on opposite sides. One of the first groove 72 and the second groove 131 has a first insertion hole 73 eccentrically provided on its bottom wall, while the other has a protruding boss 132 on its bottom wall. The boss 132 includes a first segment 1321 protruding from the bottom wall of the other segment and a second segment 1322 extending from the middle of the first segment 1321. The diameter of the first segment 1321 is larger than that of the second segment 1322. A second insertion hole 133 is provided on the end wall of the second segment 1322 facing one of the two segments. The torsion spring 8 is sleeved on the second segment 1322, with one end of the torsion spring 8 inserted into the first insertion hole 73 and the other end inserted into the second insertion hole 133. This arrangement makes the installation of the torsion spring 8 more stable, thereby ensuring that the restoring force of the torsion spring 8 can drive the frame components to automatically rotate and retract when closed.

[0050] The frame 100 is also provided with a frame locking mechanism that can lock it in the unfolded state. The frame 100 locking mechanism can be set between any two pivotally connected to the push handle 1, front foot 2, rear foot 3, support member 4, first linkage member 5, and second linkage member 6. After unlocking, the frame 100 can be folded or retracted.

[0051] In this embodiment, the first groove 72 is configured as a first toothed groove 72, and the second groove 131 is configured as a second toothed groove. The locking mechanism includes a gear 9 that is relatively movably connected to the first toothed groove 72 and the second toothed groove 131, and an elastic element (not shown) disposed between the pivot seat 13 or the connecting seat 7 and the gear 9. The gear 9 is sleeved on the boss 132, and the inner diameter of the gear 9 is larger than the outer diameter of the torsion spring 8. Under the action of the elastic element, the gear 9 simultaneously meshes with the first toothed groove 72 and the second toothed groove 131, and the frame locking mechanism is in a locked state. The pivot seat 13 and the connecting seat 7 cannot rotate relative to each other, that is, the push handle 1 and the rear foot 3 cannot rotate relative to each other, so the frame is locked in the unfolded state.

[0052] The elastic element can be configured as a compression spring, and it is located between the bottom of the first tooth groove 72 and the gear 9. When the frame locking device is to be unlocked, the drive gear 9 moves towards the first tooth groove 72. When the gear 9 moves, it moves along the boss 132. Because the inner diameter of the gear 9 is larger than the outer diameter of the torsion spring 8, the torsion spring 8 and the gear 9 do not interfere with each other. When the gear 9 moves to the point where it disengages from the second tooth groove 131 and only engages with the first tooth groove 72, the frame locking mechanism is unlocked, and the connecting seat 7 and the pivot seat 13 can rotate relative to each other, that is, the push handle 1 can rotate relative to the rear foot 3, and the frame can be folded.

[0053] The above configuration is equivalent to integrating the elastic reset element 8 and the frame locking mechanism into the pivot seat 13 and the connecting seat 7, so that they do not interfere with each other, thus making reasonable and full use of space.

[0054] In other embodiments, the specific structure and unlocking operation of the locking mechanism of the frame 100 can be any other known and feasible structure, or it can be located between any two relatively rotatable components. Since this is not the inventive point of this invention, it will not be described in detail here.

[0055] In other embodiments, the elastic reset member 8 can also be a tension spring or other type of elastic member, or it can be positioned between any two that can rotate relative to each other, as long as the aforementioned function can be achieved.

[0056] The front foot 2 is connected to the front lower part of the front wheel 20, and the rear foot 3 is connected to the rear lower part of the rear wheel 30.

[0057] Preferably, the frame 100 is configured such that, in the folded state, the rear wheel 30 and the lower ends of the upper push handle 121 and / or the lower ends of the lower push handle 11 are supported on a support surface. That is, in the folded state, the rear wheel 30 is supported on the support surface along with either the lower ends of the upper push handle 121 or the lower ends of the lower push handle 11, or the rear wheel 30 is supported on the support surface along with both. This configuration ensures that the frame 100 is in a standing position when folded, rather than lying flat, thus facilitating handling after folding. The support surface generally refers to the location of the frame when folded. If the frame is folded on the road, the ground is the support surface; if the frame 100 is folded and placed at home, the floor is the support surface; if the frame 100 is folded on a table, the table is the support surface. And so on, without further enumeration.

[0058] In this embodiment, the frame 100 includes left and right side supports 101. Each side support 101 includes a push handle 1, a front leg 2, a rear leg 3, a first linkage 5, and a second linkage 6. The support member 4 is disposed between the two side supports 101, that is, the left and right sides of the support member 4 are pivotally connected to the front leg 2 and the first linkage 5 of the two side supports 101, respectively. Furthermore, the frame 100 also includes front connecting members (not shown) that are connected to the front legs of the left and right side supports 101, respectively, and rear connecting members (not shown) that are connected to the rear legs of the left and right side supports 101, respectively. The front and rear connecting members not only make the frame more stable in the unfolded state, but also allow it to be connected to the front and rear sides of a vegetable basket (not shown).

[0059] The support member 4 is configured to connect to a pet basket, child seat, or child sleeping box. Figure 12 As shown, the stroller of the present invention also includes a pet basket 200, which is connected to the support member 46. Because the support member 46 is positioned relatively high, the pet basket 200 connected to the support member 46 is also positioned relatively high, thus facilitating the care of the pet inside the basket.

[0060] The pet basket 200 is also configured to switch between an extended and a folded state. When folding the stroller of the present invention, the pet basket 200 can be folded first, bringing it closer to the support member 46, and then the frame 100 can be folded. In this way, the folded pet basket 200 will not interfere with the push handle 1. Moreover, because the support member 46 for connecting the pet basket 200 folds together with the other components of the frame 100 when the frame 100 is folded, it is equivalent to the pet basket folding together with the frame 100 and moving closer to the other components of the frame 100, thus making the overall folding operation of the stroller of the present invention simpler.

[0061] The stroller of the present invention may also include a child seat or sleeping box, which is attached to the support member 46.

[0062] The specific structure, folding method, and connection method of the pet basket, child seat, and sleeping box can be any known and feasible structure, and are not the inventive point of this invention, so they will not be described in detail here.

[0063] Those skilled in the art should understand that the terms "upper," "lower," "left," "right," "front," "back," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. When the visual observation changes, the above orientation or positional relationship will also change accordingly, and therefore should not be construed as a limitation of the present invention.

[0064] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A trolley comprising a frame convertible between an extended state and a folded state, characterized in that: The frame includes a push handle, a front foot, a rear foot, a support member, a first linkage member, and a second linkage member; the lower side of the push handle is pivotally connected to the rear foot, and the rear side of the front foot is also pivotally connected to the rear foot; the upper side of the first linkage member is pivotally connected to the push handle, and the lower side is pivotally connected to the support member, and the support member is also pivotally connected to the front foot; the upper side of the second linkage member is pivotally connected to the push handle, and the lower side is pivotally connected to the front foot.

2. The trolley according to claim 1, characterized in that: The lower side of the push handle is pivotally connected to the rear foot around a pivot axle one, and the upper side of the second linkage rotates around a pivot axle two. When the frame is in the unfolded state, the pivot axle two is located below the pivot axle.

3. The trolley according to claim 2, characterized in that: The front foot is pivotally connected to the rear foot around pivot three, and the lower side of the second linkage rotates around pivot four and is connected to the front foot. When the frame is in the unfolded state, pivot four is located behind or above pivot three.

4. The trolley according to claim 2 or 3, characterized in that: The upper side of the first linkage is pivotally connected to the push handle around the pivot five. When the frame is in the unfolded state, the pivot five is located above the pivot one.

5. The stroller according to any one of claims 1 to 4, characterized in that: The support member is pivotally connected to the front foot around pivot six, and the lower side of the first linkage member is pivotally connected to the support member around pivot seven. When the frame is in the unfolded state, pivot six is ​​located in front of pivot seven; preferably, pivot six is ​​located in front of pivot three.

6. The trolley according to claim 5, characterized in that: The frame also includes a connector, the upper side of which is fixedly connected to the support member, and the lower side of which is pivotally connected to the front foot; preferably, the lower side of the connector is pivotally connected to the front foot rotatably around a pivot.

7. The stroller according to any one of claims 1 to 6, characterized in that: A connecting seat is fixedly connected to the front side of the rear foot, and a pivot seat is fixedly connected to the lower side of the push handle. The pivot seat is pivotally connected to the connecting seat. A blocking part protrudes from the rear side of the connecting seat. When the frame is in the unfolded state, the rear side of the lower side of the pivot seat abuts against the front side of the blocking part. Preferably, at least part of the rear side of the second linkage also abuts against the front side of the blocking part.

8. The stroller according to any one of claims 1 to 7, characterized in that: An elastic reset member is provided between any two of the push handle, front foot, rear foot, support member, first linkage member, and second linkage member, and the elastic reset member is in a tensioned state when the frame is in the unfolded state; preferably, the elastic reset member is a torsion spring, one end of which is connected to the connecting seat and the other end is connected to the pivot seat; the connecting seat and the pivot seat are respectively provided with a first groove and a second groove on opposite sides, one of the first groove and the second groove having a first insertion hole eccentrically provided on its bottom wall, and the other having a boss protruding from its bottom wall, the boss including a first segment protruding from the bottom wall of the other and a second segment extending from the middle of the first segment, the diameter of the first segment being larger than that of the second segment, and the second segment facing the... A second insertion hole is provided on one end wall of one of the components; the torsion spring is sleeved on the second segment, with one end of the torsion spring inserted into the first insertion hole and the other end inserted into the second insertion hole; preferably, the frame is also provided with a frame locking mechanism that can lock it in the unfolded state, the first groove is configured as a first tooth groove, the second groove is configured as a second tooth groove, the locking mechanism includes a gear that is relatively movably connected in the first tooth groove and the second tooth groove, and an elastic element disposed between the pivot seat or connecting seat and the gear, the gear is sleeved on the boss, and the inner diameter of the gear is larger than the outer diameter of the torsion spring; under the action of the elastic element, the gear simultaneously meshes with the first tooth groove and the second tooth groove, and the frame locking mechanism is in the locked state.

9. The stroller according to any one of claims 1 to 8, characterized in that: The rear foot is connected to the lower part of the rear wheel, and the frame is configured such that, in the folded state, the rear wheel and the lower end of the upper push handle or / and the lower end of the lower push handle are supported on the support surface.

10. The stroller according to any one of claims 1 to 9, characterized in that: The support member is configured to be connected to a pet basket, child seat, or child sleeping box; preferably, the stroller also includes a pet basket, child seat, or child sleeping box, which is connected to the support member.

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