Auxiliary mechanism for assisting the folding or unfolding of the cart frame and cart

Abstract

The present invention provides an auxiliary mechanism to assist in folding or unfolding the frame of a cart. [Solution] The cart frame 1 includes a first rod 300 and a second rod 200 that rotate relative to each other, the frame being in an unfolded state when the first rod and the second rod rotate relative to each other to a first position, and the frame being in a folded state when the first rod and the second rod rotate relative to each other to a second position. The auxiliary mechanism includes an elastic member which drives the first rod and the second rod to rotate relative to each other toward a first or second position. One end of the first rod and one end of the second rod are connected via a connecting shaft so that the first rod and the second rod are rotatable relative to each other about the connecting shaft. The elastic member is a torsion spring provided around the connecting shaft, one end of which is connected to the first rod and the other end of which is connected to the second rod.

Description

Technical Field

[0001] The present disclosure relates to a cart, and more specifically, to an auxiliary mechanism for assisting in folding or unfolding a frame of the cart.

Background Art

[0002] The cart described in this specification may be a baby stroller for carrying a child or a cart for carrying goods. Generally, the frame of the cart can be converted between a folded state and a deployed state so that the cart can be easily transported and stored when not in use.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present disclosure is to provide an auxiliary mechanism for assisting in folding or unfolding a frame of a cart, which not only facilitates a user to more easily unfold or fold the frame, but also enables the frame to be unfolded or folded to a predetermined position, thus avoiding potential safety hazards.

Means for Solving the Problems

[0004] As embodied and generally described herein, to achieve these and other advantages, in accordance with the object of the present disclosure, an auxiliary mechanism for assisting in folding or unfolding a cart frame is proposed. The frame includes a first rod and a second rod that are relatively rotated. When the first rod and the second rod are relatively rotated to a first position, the frame is in a deployed state. When the first rod and the second rod are relatively rotated to a second position, the frame is in a folded state. The auxiliary mechanism includes an elastic member, and the elastic member drives the first rod and the second rod to relatively rotate toward the first position or the second position.

[0005] In one embodiment, the first rod is a support frame of the frame, the second rod is an upper hand frame of the frame, one end of the support frame is hinged to the upper hand frame, the elastic member is a tension spring, one end of the tension spring is connected to the support frame, and the other end of the tension spring is connected to the upper hand frame, and when the support frame and the upper hand frame rotate relative to each other to the first or second position, the extension length of the tension spring is less than the maximum length of the tension spring that is extended when the support frame and the upper hand frame rotate relative to each other.

[0006] In one embodiment, one end of the first rod and one end of the second rod are connected via a connecting shaft, so that the first rod and the second rod can rotate relative to each other about the connecting shaft.

[0007] In one embodiment, the first rod is the lower hand frame of the frame, the second rod is the upper hand frame of the frame, and the auxiliary mechanism further includes an annular inclined chute and a drive block, the inclined chute being located at the first coupling end face of the upper end of the lower hand frame and surrounding the connecting shaft, the inclined chute being inclined in the rotational direction and having a highest point, the drive block being located at the second coupling end face of the lower end of the upper hand frame, the drive block being extendable from the second coupling end face, the top end of the drive block sliding in contact with the inclined chute, the elastic member being a compression spring located inside the lower end of the upper hand frame, the compression spring acting on the lower end of the drive block driving the drive block to extend from the second coupling end face and press against the inclined chute, the drive block sliding along the inclined chute and rotating the lower end of the upper hand frame relative to the upper end of the lower hand frame.

[0008] In one embodiment, the inclined chute is provided with a block section, and by blocking the drive block with the block section, the lower end of the upper hand frame can be rotated in one direction to a certain angle relative to the upper end of the lower hand frame.

[0009] In one embodiment, the first rod is the lower hand frame of the frame, the second rod is the upper hand frame of the frame, the elastic member is a torsion spring provided around the connecting shaft, one end of the torsion spring is connected to the lower end of the upper hand frame, the other end of the torsion spring is connected to the upper end of the lower hand frame, the torsion spring can drive the lower end of the upper hand frame and the upper end of the lower hand frame to rotate relative to each other, and the upper hand frame and the lower hand frame rotate relative to each other toward either the first position or the second position.

[0010] In one embodiment, the first rod is the lower hand frame of the frame, the second rod is the front wheel bracket of the frame, the elastic member is a torsion spring provided around the connecting shaft, the coupling end face of the lower end of the lower hand frame is fixed to the first seat member, the coupling end face of the upper end of the front wheel bracket is fixed to the second seat member, one end of the torsion spring is connected to the first seat member, the other end of the torsion spring is connected to the second seat member, and the torsion spring can drive the lower end of the lower hand frame and the upper end of the front wheel bracket to rotate relative to each other, thereby causing the lower hand frame and the front wheel bracket to rotate relative to one of the first or second positions.

[0011] In one embodiment, the upper end of the rear wheel bracket of the frame is connected to the lower end of the lower hand frame and the upper end of the front wheel bracket via the connecting shaft, thereby allowing the lower hand frame and the front wheel bracket to rotate relative to the rear wheel bracket.

[0012] In one embodiment, the first seat member is provided with a first bending groove extending around the connecting shaft and passing through the first seat member, the second seat member is provided with a second bending groove extending around the connecting shaft and passing through the second seat member, the second bending groove and the first bending groove have corresponding radial positions with respect to the connecting shaft, the first bending groove and the second bending groove are provided with an overlapping portion, a link gear is fixed to the upper end of the rear wheel bracket, and the link gear is inserted through the overlapping portion. Each of the first bending groove and the second bending groove has a rack structure that engages with the link gear, and when the first bending groove of the first sheet member rotates around the connecting shaft, the rack structure of the first bending groove drives the link gear, which in turn drives the second bending groove of the second sheet member to rotate in the opposite direction around the connecting shaft via the rack structure of the second bending groove, thereby causing the first sheet member and the second sheet member to rotate in opposite directions synchronously around the connecting shaft.

[0013] In another embodiment, the disclosure provides a cart in which an auxiliary mechanism assists in folding or unfolding the cart frame, as described above. [Effects of the Invention]

[0014] A beneficial effect of this disclosure is that the auxiliary mechanism for assisting the folding or unfolding of the cart frame provided herein not only makes it easier for the user to unfold or fold the frame, but also enables the frame to be unfolded or folded in place, and thus avoids potential safety hazards. The aforementioned and other purposes, features, aspects and advantages of this disclosure will become more apparent from the following detailed description of this disclosure in conjunction with the accompanying drawings. This specification includes drawings to provide a further understanding of this disclosure, to be incorporated herein, and to constitute part of this specification. The drawings illustrate embodiments of this disclosure and are used to illustrate the concepts of this disclosure together with the following description. [Brief explanation of the drawing]

[0015] [Figure 1] These are an overall perspective view and a partial enlargement view of the frame of a cart having an auxiliary mechanism according to the first embodiment of this disclosure, showing the frame in an unfolded state. [Figure 2] Figure 1 shows an overall perspective view and a close-up view of the cart frame, indicating that the frame is in a semi-folded state. [Figure 3] Figure 1 shows an overall perspective view and a close-up view of the cart frame, indicating that the frame is in a folded state. [Figure 4] This is a perspective view of the frame of a cart having an auxiliary mechanism according to a second embodiment of the present disclosure. [Figure 5] This is a partial cross-sectional view taken along line II in Figure 4. [Figure 6] Figure 5 is a perspective view of the upper end of the lower handframe. [Figure 7] Figure 5 is a perspective view of the lower end of the upper hand frame. [Figure 8] This is a schematic diagram showing the frame of the auxiliary mechanism according to the second embodiment of this disclosure in an unfolded state. [Figure 9] This is a schematic diagram showing the frame of the auxiliary mechanism according to the second embodiment of this disclosure in a semi-folded state. [Figure 10]Schematic diagram when the frame of the auxiliary mechanism according to the second embodiment of the present disclosure is in a folded state. [Figure 11] Perspective view of the frame of a cart having an auxiliary mechanism according to the third and fourth embodiments of the present disclosure. [Figure 12] Enlarged view of part A1 of the frame of FIG. 11 having an auxiliary mechanism according to the third embodiment of the present disclosure. [Figure 13] Perspective view of the upper end of the lower hand frame in FIG. 12. [Figure 14] Perspective view of the lower end of the upper hand frame in FIG. 12. [Figure 15] Enlarged view of part A2 of the frame of FIG. 11 having an auxiliary mechanism according to the fourth embodiment of the present disclosure. [Figure 16] Schematic diagram when the frame of the auxiliary mechanism according to the fourth embodiment of the present disclosure is in a deployed state. [Figure 17] Schematic diagram when the frame of the auxiliary mechanism according to the fourth embodiment of the present disclosure is in a folded state.

Mode for Carrying Out the Invention

[0016] When folding or deploying a general frame, the user needs to use a relatively large force to complete it, which is not very user-friendly for users with weak physical strength. Also, there is a possibility that the frame may not be properly folded or deployed, posing a potential safety risk to the user.

[0017] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The present disclosure is susceptible to various forms of modification and substitution, but specific embodiments thereof are shown by way of example in the accompanying drawings. However, the present disclosure should not be construed as being limited to the embodiments described herein. On the contrary, the present disclosure is directed to all modifications, equivalents, and alternatives that fall within the spirit and scope of the embodiments.

[0018] The cart frame 1 may have multiple connecting rods, which may include, for example, a support frame 100, an upper hand frame 200, a lower hand frame 300, a front wheel bracket 400, a rear wheel bracket 500, and so on. For convenience of explanation, connecting rods are involved in this disclosure, but this disclosure is not limited to these connecting rods.

[0019] Various connecting rods are connected to each other to form different parts of frame 1. Frame 1 can also be switched between a folded and unfolded state to facilitate transport and storage. Therefore, at least some of the connecting rods of frame 1 are rotatably connected to each other, and folding and unfolding of frame 1 can be achieved by the rotation of the connecting rods relative to each other. The auxiliary mechanism for assisting the folding or unfolding of frame 1 according to this disclosure can be applied to any pair of connecting rods that are rotatably connected to each other within frame 1. For general purposes, in this disclosure, one of a pair of rotatably connected connecting rods is defined as the first rod, and the other as the second rod. When the first rod and the second rod rotate relative to each other to a first position, frame 1 is in the unfolded state, and when the first rod and the second rod rotate relative to each other to a second position, frame 1 is in the folded state. According to the auxiliary mechanism of this disclosure, the first rod and the second rod can be rotated relative to each other to a first or second position. Specifically, the auxiliary mechanism includes an elastic member which drives a first rod and a second rod to rotate relative to each other toward a first or second position. Meanwhile, the action of the elastic member holds the first and second rods in the first or second position after they have rotated to this position, so that the frame 1 remains in an unfolded or folded state. Thus, the auxiliary mechanism according to this disclosure not only facilitates the user unfolding or folding the frame 1, but also allows the frame 1 to be unfolded or folded in a predetermined position to avoid potential safety hazards.

[0020] Hereinafter, specific embodiments of the auxiliary mechanism described herein will be described in detail with reference to the drawings.

[0021] Figures 1 to 3 show an auxiliary mechanism according to the first embodiment of this disclosure.

[0022] As shown in Figures 1 to 3, the first rod is the support frame 100 of frame 1, and the second rod is the upper hand frame 200 of frame 1, with one end of the support frame 100 hinged to the upper hand frame 200 so that the support frame 100 and the upper hand frame 200 can rotate relative to each other. Here, the support frame 100 can be used to connect the upper hand frame 200 to the front wheel bracket, as shown in Figure 1. The upper hand frame 200 is used by the user to apply force to the cart.

[0023] In the first embodiment, the elastic member is a tension spring S1, with one end connected to the support frame 100 and the other end connected to the upper hand frame 200. In order to rotate the support frame 100 and the upper hand frame 200 relative to each other toward a first or second position by the tension spring S1, it is desirable to set the connection position of the tension spring S1 such that the extension length L1 of the tension spring S1 when the support frame 100 and the upper hand frame 200 are rotated relative to each other toward a first position (see Figure 1), and the extension length L2 of the tension spring S1 when the support frame 100 and the upper hand frame 200 are rotated relative to each other toward a second position (see Figure 3), are smaller than the maximum extension length L3 of the tension spring S1 when the support frame 100 and the upper hand frame 200 are rotated relative to each other (see Figure 2). Generally, when the axis of rotation between the support frame 100 and the upper hand frame 200 is collinear with both connecting ends of the tension spring S1, the tension spring S1 is stretched to its maximum length L3, as shown in Figure 2.

[0024] In this way, when the user prepares to convert frame 1 between the unfolded and folded states, the user applies a force to frame 1 in such a way as to overcome the elastic force of the tension spring S1, allowing the support frame 100 and the upper hand frame 200 to rotate relative to one of the first and second positions from one to the other. During this process, the tension spring S1 stretches. After the tension spring S1 is stretched to its maximum length L3 and the support frame 100 and the upper hand frame 200 have continued to rotate in the same direction, the user no longer needs to apply a force to frame 1, and the elastic force of the tension spring S1 drives the support frame 100 and the upper hand frame 200 to rotate relative to the other position and remain there.

[0025] Accordingly, according to the first embodiment of the present disclosure, the auxiliary mechanism is arranged as a tension spring S1 so as to be able to drive the support frame 100 and the upper hand frame 200 to rotate relative to each other toward a first position, and also so as to be able to drive both the support frame 100 and the upper hand frame 200 to rotate relative to each other toward a second position.

[0026] Figures 4 to 10 show an auxiliary mechanism according to a second embodiment of the present disclosure.

[0027] As shown in Figure 5, in the second embodiment, the ends of the first and second rods are connected by a connecting shaft O, and the first and second rods can rotate relative to each other about the connecting shaft O.

[0028] As shown in Figure 5, the first rod is the lower hand frame 300 of frame 1, and the second rod is the upper hand frame 200 of frame 1. The upper end 330 of the lower hand frame 300 and the lower end 220 of the upper hand frame 200 are hinged together by a connecting shaft O.

[0029] To realize the function of frame 1 for assisting in the folding or unfolding of the cart, the auxiliary mechanism according to the second embodiment further includes an annular inclined chute 310 positioned on the first coupling end face 330A of the upper end 330 of the lower hand frame 300 and surrounding the connecting shaft O. The inclined chute 310 is inclined along the rotational direction (i.e., the circumferential direction of the first coupling end face 330A), as shown in Figure 6, and has a highest point 311. A drive block 210 is positioned on the second coupling end face 220A of the lower end 220 of the upper hand frame 200, and the drive block 210 is retractably positioned from the second coupling end face 220A, and as shown in Figure 7, the top end 211 of the drive block 210 slides while in contact with the inclined chute 310.

[0030] Preferably, the top end 211 of the drive block 210 is positioned as an arc-shaped upper surface, which reduces the frictional force of the top end 211 when it slides while in contact with the inclined chute 310.

[0031] In the second embodiment, the elastic member is a compression spring S2 located inside the lower end 220 of the upper hand frame 200. As shown in Figure 5, this compression spring S2 acts on the lower end 212 of the drive block 210, biasing the drive block 210 to extend from the second coupling end face 220A and press against the inclined chute 310.

[0032] In the second embodiment, the drive block 210 exerts a force on the inclined chute 310 due to the force acting on it by the compression spring S2, and the inclined chute 310 exerts a reaction force on the drive block 210. Since the surface of the inclined chute 310 is inclined with respect to the direction of the force acting on the drive block 210 (i.e., the direction of extension of the drive block 210), the reaction force exerted by the inclined chute 310 on the drive block 210 generates a force component along the rotational direction, causing the drive block 210 to slide downward along the inclined chute 310 due to the reaction force of the inclined chute 310, and rotating the lower end 220 of the upper hand frame 200 relative to the upper end 330 of the lower hand frame 300, thereby achieving relative rotation of the upper hand frame 200 and the lower hand frame 300.

[0033] Preferably, the inclined chute 310 is provided with a block portion 312, which obstructs the drive block 210, preventing the lower end 220 of the upper hand frame 200 from rotating in one direction to a certain angle relative to the upper end 330 of the lower hand frame 300. The purpose of arranging the block portion 312 is that when the upper hand frame 200 and the lower hand frame 300 rotate relative to each other to a first position, the frame 1 reaches an unfolded state. At this time, if the lower end 220 of the upper hand frame 200 could continue to rotate in this direction relative to the upper end 330 of the lower hand frame 300, that is, if the upper hand frame 200 and the lower hand frame 300 could continue to rotate relative to each other, the frame 1 would be in an unstable unfolded state, potentially creating a safety hazard. If the inclined chute 310 is equipped with a block portion 312, the drive block 210 is blocked by the block portion 312, so that the lower end 220 of the upper hand frame 200 can only rotate to a certain angle in one direction relative to the upper end 330 of the lower hand frame 300. As a result, when the upper hand frame 200 and the lower hand frame 300 have rotated relative to each other to a first position, further relative rotation is prevented, thus avoiding potential safety hazards.

[0034] Next, the operating state of the auxiliary mechanism according to the second embodiment of this disclosure will be described with reference to Figures 8 to 10.

[0035] As shown in Figure 8, the drive block 210 positioned at the lower end 220 of the upper hand frame 200 is blocked by a block portion 312 provided on the inclined chute 310. At this time, the upper hand frame 200 and the lower hand frame 300 are rotated relative to each other to a first position, and the frame 1 is in an unfolded state. Simultaneously, the drive block 210, under the biasing force of the compression spring S2, continuously contacts the block portion 312 along the inclined chute 310, thereby holding the upper hand frame 200 and the lower hand frame 300 in the first position and holding the frame 1 in an unfolded state.

[0036] When the user is ready to fold frame 1, they apply a force to frame 1 to rotate the upper hand frame 200 and the lower hand frame 300 relative to each other from a first position to a second position, thereby overcoming the elastic force of the compression spring S2 and sliding the drive block 210 upward along the inclined chute 310 until the drive block 210 reaches the highest point 311 of the inclined chute 310, as shown in Figure 9 (the highest point 311 is not shown in Figure 9 because it is covered by the drive block 210). At this time, the compression spring S2 is compressed to its minimum extent, and the elastic force exerted by the compression spring S2 on the drive block 210 is also maximized. Then, after the upper hand frame 200 and the lower hand frame 300 have rotated relative to each other in a continuous manner toward the second position so that the drive block 210 exceeds the highest point 311, the user does not need to apply any force to the frame 1, and the elastic force of the compression spring S2 causes the drive block 210 to slide downward along the inclined chute 310, thereby causing the lower end 220 of the upper hand frame 200 to rotate relative to the upper end 330 of the lower hand frame 300. As shown in Figure 10, the upper hand frame 200 and the lower hand frame 300 have rotated relative to each other to the second position, and the upper hand frame 200 and the lower hand frame 300 continue to rotate relative to each other toward the second position until they remain in the second position.

[0037] When the user is ready to unfold Frame 1, this process is the opposite of folding Frame 1.

[0038] Therefore, with the configuration of the auxiliary mechanism according to the second embodiment of this disclosure, the compression spring S2 can drive the upper hand frame 200 and the lower hand frame 300 to rotate relative to each other toward a first position, and can also drive the upper hand frame 200 and the lower hand frame 300 to rotate relative to each other toward a second position.

[0039] Figures 11 to 14 show an auxiliary mechanism according to a third embodiment of the present disclosure.

[0040] In the third embodiment, one end of the first rod and one end of the second rod are connected by a connecting shaft and can rotate relative to each other around the connecting shaft.

[0041] In the third embodiment, one end of the first rod and one end of the second rod are connected by a connecting shaft and can rotate relative to each other around the connecting shaft.

[0042] As shown in Figures 11 and 12, the first rod is the lower hand frame 300 of frame 1, and the second rod is the upper hand frame 200 of frame 1. The upper end 330 of the lower hand frame 300 and the lower end 220 of the upper hand frame 200 are hinged together via a connecting shaft O' (see Figure 13).

[0043] In the third embodiment, the elastic member is a torsion spring S3 provided around a connecting axis O'. The first end of the torsion spring S3 is connected to the lower end 220 of the upper hand frame 200, and the second end of the torsion spring S3 is connected to the upper end 330 of the lower hand frame 300. The torsion spring S3 can rotate the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300 relative to each other, so that the upper hand frame 200 and the lower hand frame 300 rotate relative to each other to either a first position or a second position.

[0044] For example, referring to Figure 13, at this time the frame is in the unfolded state and the torsion spring S3 is in the biased state. When the user is ready to fold the frame, the user can unlock the frame in the unfolded state, and the torsion spring S3 drives the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300 to rotate relative to each other, thereby rotating the upper hand frame 200 and the lower hand frame 300 relative to each other to a second position and realizing automatic folding of the frame.

[0045] Of course, the torsion spring S3 may be set to be under stress when the frame is in the folded state. In this case, when the user is ready to unfold the frame, the frame can be unlocked in the folded state, and the torsion spring S3 unlocks the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300, causing them to rotate relative to each other, thereby rotating the upper hand frame 200 and the lower hand frame 300 relative to each other toward a first position and enabling automatic unfolding of the frame.

[0046] Unlike the first and second embodiments, the auxiliary mechanism according to the third embodiment of this disclosure is provided such that a torsion spring S3 is provided so as to be rotatable relative to the upper hand frame 200 and the lower hand frame 300 toward one of the first or second positions.

[0047] Furthermore, both ends of the torsion spring S3 can be connected to the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300 in various ways. For example, holes can be formed in the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300, and then both ends of the torsion spring S3 can be inserted into the respective holes. Alternatively, fixing posts can be formed in the lower end 220 of the upper hand frame 200 and the upper end 330 of the lower hand frame 300, and then both ends of the torsion spring S3 can be connected to the corresponding fixing posts.

[0048] Figures 11 and 15 to 17 show an auxiliary mechanism according to a fourth embodiment of this disclosure.

[0049] In the fourth embodiment, one end of the first rod and one end of the second rod may be connected via a connecting shaft so as to rotate relative to each other.

[0050] As shown in Figures 11 and 15, the first rod is the lower hand frame 300 of frame 1, and the second rod is the front wheel bracket 400 of frame 1. The lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 are hinged together via a connecting shaft O''.

[0051] In the fourth embodiment, the elastic member is a torsion spring S3' provided around the connecting shaft O''. However, unlike the third embodiment, as shown in Figures 16 and 17, the coupling end face of the lower end 340 of the lower hand frame 300 is fixed to the first seat member 320, and the coupling end face of the upper end 420 of the front wheel bracket 400 is fixed to the second seat member 410. Since one end of the torsion spring S3' is connected to the first seat member 320 and the other end is connected to the second seat member 410, the torsion spring S3' drives the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 to rotate relative to each other, thereby allowing the lower hand frame 300 and the front wheel bracket 400 to rotate relative to either the first or second position.

[0052] In the fourth embodiment, the upper end 520 of the rear wheel bracket 500 is connected to the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 via a connecting shaft O'', so that both the lower hand frame 300 and the front wheel bracket 400 are rotatable relative to the rear wheel bracket 500.

[0053] As shown in Figures 16 and 17, in order to achieve synchronous counter-rotation of the lower hand frame 300 and the front wheel bracket 400 relative to the rear wheel bracket 500, the first seat member 320 is provided with a first bending groove 321 that passes through the first seat member 320 and extends around the connecting shaft O'', and the second seat member 410 is provided with a second bending groove 411 that passes through the second seat member 410 and extends around the connecting shaft O''. The second bending groove 411 and the first bending groove 321 have corresponding radial positions with respect to the connecting shaft O''. Furthermore, the first bending groove 321 and the second bending groove 411 are arranged to have an overlapping portion. The upper end 520 of the rear wheel bracket 500 is fixed by a rotating link gear 510, which is positioned to pass through the overlapping portion.

[0054] Furthermore, each of the first bending groove 321 and the second bending groove 411 has a rack structure that engages with the link gear 510, so that the rotation of the first bending groove 321 causes the second bending groove 411 to rotate in the opposite direction synchronously via the link gear 510, so that the first seat member 320 where the first bending groove 321 is located and the second seat member 410 where the second bending groove 411 is located rotate in the opposite direction synchronously around axis O'', that is, the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 rotate in the opposite direction synchronously, so that the lower hand frame 300 and the front wheel bracket 400 rotate in the opposite direction synchronously with respect to the rear wheel bracket 500. In Figures 16 and 17, the rack structure of the first bend groove 321 is located outside the first bend groove 321, away from the connecting axis O'', and the rack structure of the second bend groove 411 is located inside the second bend groove 411, closer to the connecting axis O'', thereby ensuring that the link gear 510 causes the first bend groove 321 and the second bend groove 411 to rotate in opposite directions relative to each other, and that the lower hand frame 300 and the front wheel bracket 400 rotate in opposite directions relative to the rear wheel bracket 500. Of course, the disclosure is not limited thereto. For example, the rack structure of the first bend groove 321 may be located inside the first bend groove 321, closer to the connecting axis O'', and the rack structure of the second bend groove 411 may be located outside the second bend groove 411, away from the connecting axis O'', thereby achieving a similar effect. Here, “synchronously” means that the related rotations or turns are performed at the same angle and speed.

[0055] Next, I will explain the work procedure in detail.

[0056] Referring to Figure 16, at this time the frame is in the unfolded state, the torsion spring S3' is under force, and the link gear 510 is located in the overlapping portion between the front end of the first bending groove 321 and the rear end of the second bending groove 411. When the user prepares to fold the frame 1, the frame can be unlocked in the unfolded state, and the torsion spring S3' rotates the first seat member 320 and the second seat member 410 in opposite directions around the connecting axis O'''', causing the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 to rotate relative to each other, and finally rotating the lower hand frame 300 and the front wheel bracket 400 to a second position relative to the rear wheel bracket. In this process, the lower end 340 of the lower hand frame 300 rotates relative to the upper end 520 of the rear wheel bracket 500, and at this time, the first seat member 320 located at the lower end 340 of the lower hand frame 300 rotates together with the first bending groove 321 located on the first seat member 320 around the connecting axis O''. Since the rack structures of both the first bending groove 321 and the second bending groove 411 are engaged with the link gear 510, the rotation of the first bending groove 321 causes the rack structure of the first bending groove 321 to rotate the link gear 510 itself, and the rotation of the link gear 510 causes the second bending groove 411 and the second seat member 410 located on it to rotate in the opposite direction around the connecting axis O'' via the rack structure of the second bending groove 411, thereby causing the upper end 420 of the front wheel bracket 400 to rotate in the opposite direction relative to the upper end 520 of the rear wheel bracket 500. Therefore, as shown in Figure 17, the lower hand frame 300 and the front wheel bracket 400 rotate in the opposite direction in sync with the rear wheel bracket 500, enabling automatic folding of the frame.

[0057] Of course, the torsion spring S3' can also be positioned such that it is under stress when the frame is in the folded state shown in Figure 17. In such a case, when the user is ready to unfold the frame, the frame can be unlocked in the folded state, and the torsion spring S3' drives the first seat member 320 and the second seat member 410 to rotate relative to each other around the connecting axis O'', causing the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 to rotate relative to each other, and finally rotating the lower hand frame 300 and the front wheel bracket 400 relative to each other toward the first position. The latter process is the reverse of the process of folding the frame described above.

[0058] As described above, the auxiliary mechanism of this disclosure allows the cart frame to be easily folded or unfolded, making the cart more convenient and reliable to use.

[0059] Since the features of this disclosure can be embodied in various ways without departing from the features of this disclosure, it should be understood that, unless otherwise indicated, the embodiments described above are not limited to the details described above and should be interpreted broadly within the scope set forth in the appended claims. Accordingly, all modifications and changes included within the scope and limitations of the claims, or equivalents thereof, should be covered by the appended claims. [Explanation of symbols]

[0060] 1 frame 100 Support Frames 200 Upper Handframe 210 Drive Block 211 Apex 212 Bottom end 220 Lower end of upper hand frame 220A Second coupling end face 300 Lower Handframe 310 Slanted Shot 311 Highest score 312 Block section 320 First sheet member 321 First folding groove 330 Upper end of lower hand frame 330A First coupling end face 340 Lower end of lower hand frame 400 Front Wheel Bracket 410 Second sheet member 411 Second folding groove 420 Upper end of front wheel bracket 500 Rear wheel bracket 510 Link Gear 520 Upper end of rear wheel bracket S1 tension spring S2 Compression Spring S3, S3' Torsion spring L1, L2, L3: Extension lengths of tension springs O, O', O'' connecting axis

Claims

1. An auxiliary mechanism for assisting in the folding or unfolding of the cart frame, The frame includes a first rod and a second rod that rotate relative to each other, wherein when the first rod and the second rod rotate relative to a first position, the frame is in an unfolded state, and when the first rod and the second rod rotate relative to a second position, the frame is in a folded state. The auxiliary mechanism includes an elastic member, which drives the first rod and the second rod to rotate relative to each other toward the first position or the second position. One end of the first rod and one end of the second rod are connected via a connecting shaft, and the first rod and the second rod are rotatable relative to each other about the connecting shaft. The elastic member is a torsion spring provided around the connecting shaft, one end of the torsion spring is connected to the first rod, and the other end of the torsion spring is connected to the second rod. An auxiliary mechanism characterized by the following features.

2. The coupling end face at the lower end of the first rod is fixed to the first seat member, and the coupling end face at the upper end of the second rod is fixed to the second seat member. The auxiliary mechanism according to claim 1, characterized in that one end of the torsion spring is connected to the first seat member, and the other end of the torsion spring is connected to the second seat member, thereby driving the torsion spring so that the lower end of the first rod and the upper end of the second rod rotate relative to each other, and the first rod and the second rod rotate relative to each other toward either the first position or the second position.

3. The first sheet member is provided with a first bending groove that extends around the connecting shaft and penetrates the first sheet member, and the second sheet member is provided with a second bending groove that extends around the connecting shaft and penetrates the second sheet member, the second bending groove and the first bending groove have corresponding radial positions with respect to the connecting shaft, and the first bending groove and the second bending groove are provided with overlapping portions. The link gear is positioned so as to be inserted through the aforementioned overlapping portion. The auxiliary mechanism according to claim 2, wherein each of the first bending groove and the second bending groove has a rack structure that engages with the link gear, and when the first bending groove of the first sheet member rotates around the connecting shaft, the rack structure of the first bending groove drives the link gear, and the link gear drives the second bending groove of the second sheet member to rotate in the opposite direction around the connecting shaft via the rack structure of the second bending groove, thereby causing the first sheet member and the second sheet member to rotate in opposite directions synchronously around the connecting shaft.

4. The rack structure of the first bending groove is located on the outside of the first bending groove, far from the connecting axis, and the rack structure of the second bending groove is located on the inside of the second bending groove, closer to the connecting axis, or The auxiliary mechanism according to claim 3, characterized in that the rack structure of the first bending groove is located on the inside of the first bending groove, close to the connecting shaft, and the rack structure of the second bending groove is located on the outside of the second bending groove, farther from the connecting shaft.

5. The auxiliary mechanism according to claim 3, characterized in that the first rod is the lower hand frame of the frame, the second rod is the front wheel bracket of the frame, and the lower end of the lower hand frame and the upper end of the front wheel bracket are hinge-connected via the connecting shaft.

6. The auxiliary mechanism according to claim 5, characterized in that the upper end of the rear wheel bracket of the frame is connected to the lower end of the lower hand frame and the upper end of the front wheel bracket via the connecting shaft, and the lower hand frame and the front wheel bracket are rotatable relative to the rear wheel bracket.

7. The auxiliary mechanism according to claim 6, characterized in that the link gear is fixed to the upper end of the rear wheel bracket.

8. An auxiliary mechanism for assisting in the folding or unfolding of the cart frame, The frame includes a first rod and a second rod that rotate relative to each other, wherein when the first rod and the second rod rotate relative to a first position, the frame is in an unfolded state, and when the first rod and the second rod rotate relative to a second position, the frame is in a folded state. The auxiliary mechanism includes an elastic member, which drives the first rod and the second rod to rotate relative to each other toward the first position or the second position. The elastic member is a tension spring located outside the first rod and the second rod, with one end of the tension spring connected to the first rod and the other end of the tension spring connected to the second rod. An auxiliary mechanism characterized by the following features.

9. The auxiliary mechanism according to claim 8, characterized in that when the first rod and the second rod rotate relative to each other at the first or second position, the extension length of the tension spring is set to be less than the maximum length of the tension spring that is extended when the first rod and the second rod rotate relative to each other.

10. The auxiliary mechanism according to claim 8, characterized in that the first rod is a support frame of the frame, and the second rod is an upper hand frame of the frame.

11. The auxiliary mechanism according to claim 8, characterized in that one end of the first rod and one end of the second rod are connected via a connecting shaft, and the first rod and the second rod are rotatable relative to each other about the connecting shaft.

12. A cart characterized in that the auxiliary mechanism described in any one of claims 1 to 11 assists in folding or unfolding the frame.

Images