Auxiliary mechanism for assisting in folding or unfolding a cart frame and cart

Abstract

As with the cart, an assist mechanism is provided to assist in folding or unfolding the cart frame. [Solution] The frame of the cart includes a first rod and a second rod that rotate relative to each other, the frame is in an unfolded state when the first rod and the second rod rotate relative to a first position, and the frame is in a folded state when the first rod and the second rod rotate relative to a second position, and the assist mechanism includes an elastic member that drives the first rod and the second rod to rotate relative to each other toward the first position or the second position. The assist mechanism according to the present disclosure not only facilitates the user to unfold or fold the frame more easily, but also allows the frame to be unfolded or folded in a predetermined position, thus avoiding potential safety hazards.

Description

[Technical field]

[0001] The present disclosure relates to carts, and more particularly to an assist mechanism for assisting in folding or unfolding a cart frame. [Background technology]

[0002] The carts described herein may be strollers for carrying children or carts for carrying items. Typically, the frame of the cart can be converted between a folded state and an unfolded state so that the cart can be easily transported and stored when not in use. Summary of the Invention [Problem to be solved by the invention]

[0003] An objective of the present disclosure is to provide an assist mechanism to assist in folding or unfolding a cart frame, which not only facilitates a user to unfold or fold the frame more easily, but also allows the frame to be unfolded or folded in place, thus avoiding potential safety hazards. [Means for solving the problem]

[0004] To achieve these and other advantages as embodied and generally described herein, and in accordance with the objectives of the present disclosure, an assist mechanism is proposed for assisting folding or unfolding of a cart frame, the frame including a first rod and a second rod that are rotated relative to each other, the frame being in an unfolded state when the first rod and the second rod are rotated relative to each other to a first position, and the frame being in a folded state when the first rod and the second rod are rotated relative to each other to a second position, the assist mechanism including an elastic member that drives the first rod and the second rod to rotate relative to each other 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 relatively to the first position or the second position, the extension length of the tension spring is less than the maximum length of the tension spring extended when the support frame and the upper hand frame rotate relatively.

[0006] In one embodiment, one end of the first rod and one end of the second rod are coupled via a connecting axis, such that the first rod and the second rod are rotatable relative to each other around the connecting axis.

[0007] In one embodiment, the first rod is a lower hand frame of the frame, the second rod is an upper hand frame of the frame, and the auxiliary mechanism further includes an annular inclined chute and a drive block, the inclined chute is located on a first coupling end face at an upper end of the lower hand frame and surrounds the connection shaft, the inclined chute is inclined in a rotational direction and has a highest point, the drive block is located on a second coupling end face at the lower end of the upper hand frame, the drive block is extendable from the second coupling end face, the top end of the drive block slides while abutting against the inclined chute, the elastic member is a compression spring located inside the lower end of the upper hand frame, and the compression spring acts on the lower end of the drive block to drive the drive block to extend from the second coupling end face and press against the inclined chute, and the drive block slides along the inclined chute to rotate 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 portion, and by blocking the drive block with the block portion, 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 a lower hand frame of the frame, the second rod is an upper hand frame of the frame, the elastic member is a torsion spring arranged around the connection axis, one end of the torsion spring is connected to a lower end of the upper hand frame and the other end of the torsion spring is connected to an 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 relatively toward one of the first position or the second position.

[0010] In one embodiment, the first rod is a lower hand frame of the frame, the second rod is a front wheel bracket of the frame, the elastic member is a torsion spring arranged around the connection axis, a coupling end surface of the lower end of the lower hand frame is fixed to a first sheet member, the coupling end surface of the upper end of the front wheel bracket is fixed to a second sheet member, one end of the torsion spring is connected to the first sheet member, and the other end of the torsion spring is connected to the second sheet 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, whereby the lower hand frame and the front wheel bracket rotate relatively toward one of the first position or the second position.

[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 sheet member is provided with a first folding groove extending around the connecting shaft and penetrating the first sheet member, the second sheet member is provided with a second folding groove extending around the connecting shaft and penetrating the second sheet member, the second folding groove and the first folding groove have corresponding radial positions with respect to the connecting shaft, the first folding groove and the second folding groove are provided to have an overlapping portion, a link gear is fixed to the upper end of the rear wheel bracket, and the link gear is inserted into the overlapping portion, Each of the first folding groove and the second folding groove has a rack structure that engages with the link gear, and when the first folding groove of the first sheet member rotates around the connecting axis, the rack structure of the first folding groove drives the link gear, and the link gear drives the second folding groove of the second sheet member to rotate in the opposite direction around the connecting axis via the rack structure of the second folding groove, thereby causing the first sheet member and the second sheet member to rotate in the opposite direction synchronously around the connecting axis.

[0013] In another aspect, the present disclosure provides a cart, as described above, in which an assist mechanism assists in folding or unfolding a frame of the cart. Effect of the Invention

[0014] The beneficial effect of the present disclosure is that the assist mechanism for assisting folding or unfolding the frame of the cart according to the present disclosure can not only make it easier for the user to unfold or fold the frame, but also allows the frame to be unfolded or folded in place, thus avoiding potential safety hazards. The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the disclosure in conjunction with the accompanying drawings. This specification includes drawings to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and are used to explain the concepts of the present disclosure together with the following description. [Brief description of the drawings]

[0015] [Figure 1] 1 is an overall perspective view and a partially enlarged view of a frame of a cart having an assist mechanism according to a first embodiment of the present disclosure, showing the frame in an unfolded state. [Diagram 2] 2 is an overall perspective view and a partially enlarged view of the cart frame shown in FIG. 1, showing the frame in a semi-folded state. [Diagram 3] 2 is an overall perspective view and a partially enlarged view of the cart frame shown in FIG. 1, showing the frame in a folded state. [Figure 4] FIG. 13 is a perspective view of a frame of a cart having an assist mechanism according to a second embodiment of the present disclosure. [Diagram 5] FIG. 5 is a partial cross-sectional view taken along line II in FIG. 4. [Figure 6] FIG. 6 is a perspective view of the upper end of the lower hand frame in FIG. 5. [Figure 7] FIG. 6 is a perspective view of the lower end of the upper hand frame in FIG. 5. [Figure 8] 13 is a schematic diagram showing a frame of an assist mechanism according to a second embodiment of the present disclosure in an unfolded state. FIG. [Figure 9] 13 is a schematic diagram showing a frame of an assist mechanism according to a second embodiment of the present disclosure in a semi-folded state. FIG. [Figure 10]FIG. 11 is a schematic diagram showing a state in which a frame of an assist mechanism according to a second embodiment of the present disclosure is in a folded state. [Figure 11] FIG. 13 is a perspective view of a frame of a cart having an assist mechanism according to the third and fourth embodiments of the present disclosure. [Figure 12] FIG. 12 is an enlarged view of a portion A1 of the frame of FIG. 11 having an assist mechanism according to a third embodiment of the present disclosure. [Figure 13] FIG. 13 is a perspective view of the upper end of the lower hand frame in FIG. 12. [Figure 14] FIG. 13 is a perspective view of the lower end of the upper hand frame in FIG. 12. [Figure 15] FIG. 12 is an enlarged view of a portion A2 of the frame of FIG. 11 having an assist mechanism according to a fourth embodiment of the present disclosure. [Figure 16] FIG. 13 is a schematic diagram showing a frame of an assist mechanism according to a fourth embodiment of the present disclosure in an unfolded state. [Figure 17] FIG. 13 is a schematic diagram showing a state in which a frame of an assist mechanism according to a fourth embodiment of the present disclosure is in a folded state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] When folding or unfolding a typical frame, the user needs to use a relatively large amount of force to complete it, which is not friendly to users with weak physical strength, and the frame may not be folded or unfolded properly, which poses a potential safety hazard to the user.

[0017] Exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. While the present disclosure is susceptible to modifications and substitutions in various forms, 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 set forth herein, but on the contrary, the present disclosure covers all modifications, equivalents, and alternatives falling within the spirit and scope of the embodiments.

[0018] The frame 1 of the cart has multiple connecting rods, which can 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, etc. For convenience of explanation, the connecting rods are involved in the present disclosure, but the present disclosure is not limited to these connecting rods.

[0019] Various connecting rods are connected to each other to form different parts of the frame 1. Also, the frame 1 can be switched between a folded state and an unfolded state, typically for ease of transportation and storage. Thus, at least some of the connecting rods of the frame 1 are rotatably connected to each other, and folding and unfolding of the frame 1 can be achieved by rotating the connecting rods relative to each other. It should be noted that the assisting mechanism for assisting folding or unfolding of the frame 1 according to the present disclosure can be applied to any pair of connecting rods rotatably connected to each other in the frame 1. For general description, in the present disclosure, one of the pair of connecting rods rotatably connected to each other is defined as a first rod, and the other is defined as a second rod. When the first rod and the second rod rotate to a first position relative to each other, the frame 1 is in an unfolded state, and when the first rod and the second rod rotate to a second position relative to each other, the frame 1 is in a folded state. According to the assisting mechanism of the present disclosure, the first rod and the second rod can be rotated to a first or second position relative to each other. Specifically, the assist mechanism includes an elastic member, which drives the first rod and the second rod to rotate relatively toward the first position or the second position. Meanwhile, due to the action of the elastic member, the first and second rods are held in the first or second position after rotating to this position, so that the frame 1 maintains the unfolded or folded state. Thus, the assist mechanism according to the present disclosure can not only facilitate the user to unfold or fold the frame 1, but also unfold or fold the frame 1 in a predetermined position to avoid potential safety hazards.

[0020] Hereinafter, specific embodiments of the assist mechanism according to the present disclosure will be described in detail with reference to the drawings.

[0021] 1 to 3 show an assist mechanism according to a first embodiment of the present disclosure.

[0022] As shown in Figures 1 to 3, the first rod is the support frame 100 of the frame 1, and the second rod is the upper hand frame 200 of the frame 1, and one end of the support frame 100 is hinged to the upper hand frame 200 so that the support frame 100 and the upper hand frame 200 can rotate relatively. 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 for the user to apply force to the cart.

[0023] In the first embodiment, the elastic member is a tension spring S1 having one end connected to the support frame 100 and the other end connected to the upper hand frame 200. In order to rotate and drive the support frame 100 and the upper hand frame 200 relatively toward the first position or the second position by the tension spring S1, it is desirable to set the connection position of the tension spring S1 so that the extension length L1 of the tension spring S1 when the support frame 100 and the upper hand frame 200 rotate relatively to the first position (see FIG. 1) and the extension length L2 of the tension spring S1 when the support frame 100 and the upper hand frame 200 rotate relatively to the second position (see FIG. 3) are smaller than the maximum extension length L3 (see FIG. 2) of the tension spring S1 when the support frame 100 and the upper hand frame 200 rotate relatively. In general, when the axis of rotation about which the support frame 100 and the upper hand frame 200 rotate relative to each other is on the same line as both connection ends of the tension spring S1, the tension spring S1 is extended to a maximum length L3 as shown in FIG.

[0024] In this way, when the user prepares the frame 1 to be transformed between the unfolded state and the folded state, the user exerts an action force on the frame 1 to overcome the elastic force of the tension spring S1, and the support frame 100 and the upper hand frame 200 can rotate relatively from one of the first position and the second position to the other position. In this process, the tension spring S1 is stretched. After the tension spring S1 is stretched to the maximum length L3 and the support frame 100 and the upper hand frame 200 continue to rotate in the same direction, the user no longer needs to continue to apply an action force to the frame 1, and the elastic force of the tension spring S1 drives the support frame 100 and the upper hand frame 200 to rotate relatively to the other position and stay there.

[0025] Therefore, according to the first embodiment of the present disclosure, the auxiliary mechanism is arranged as a tension spring S1 such that it can drive the support frame 100 and the upper hand frame 200 to rotate relatively toward a first position, and also such that it can drive both the support frame 100 and the upper hand frame 200 to rotate relatively toward a second position.

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

[0027] In the second embodiment, as shown in FIG. 5, the ends of the first and second rods are connected by a connecting axis O, and the first and second rods can rotate relative to each other around the connecting axis O.

[0028] 5, the first rod is the lower hand frame 300 of the frame 1, and the second rod is the upper hand frame 200 of the frame 1. The upper end 330 of the lower hand frame 300 and the lower end 220 of the upper hand frame 200 are hingedly connected by a connecting axis O.

[0029] In order to realize the function of the frame 1 for assisting folding or unfolding the cart, the assist mechanism according to the second embodiment further includes an annular inclined chute 310 disposed on the first coupling end surface 330A of the upper end 330 of the lower hand frame 300 and surrounding the connection axis O. The inclined chute 310 is inclined along the rotation direction (i.e., the circumferential direction of the first coupling end surface 330A) and has a highest point 311, as shown in FIG. 6, and a driving block 210 is disposed on the second coupling end surface 220A of the lower end 220 of the upper hand frame 200, and the driving block 210 is disposed so as to be extendable and retractable from the second coupling end surface 220A, and the top end 211 of the driving block 210 slides while abutting against the inclined chute 310, as shown in FIG. 7.

[0030] Preferably, the top end 211 of the drive block 210 is arranged as an arc-shaped upper surface, so that the frictional force of the top end 211 when it slides in contact with the inclined chute 310 can be reduced.

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

[0032] In the second embodiment, the driving block 210 exerts an acting force on the inclined chute 310 under the acting force of the compression spring S2, and the inclined chute 310 exerts a reaction force on the driving block 210. Since the surface of the inclined chute 310 is inclined with respect to the acting force direction of the driving block 210 (i.e., the extension direction of the driving block 210), the reaction force exerted by the inclined chute 310 on the driving block 210 generates a force component along the rotation direction, and the driving block 210 slides downward along the inclined chute 310 under the reaction force of the inclined chute 310, and the lower end 220 of the upper hand frame 200 rotates with respect to the upper end 330 of the lower hand frame 300, thereby realizing the 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 part 312, which blocks the driving block 210 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. The purpose of arranging the block part 312 is that when the upper hand frame 200 and the lower hand frame 300 rotate relatively 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 can 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 can continue to rotate relatively, the frame 1 will be in an unstable unfolded state, which may cause a safety hazard. When 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 rotate relatively to the first position, further relative rotation is prevented, thereby avoiding potential safety hazards.

[0034] Next, an operating state of the assist mechanism according to the second embodiment of the present disclosure will be described with reference to FIGS.

[0035] As shown in Fig. 8, the driving block 210 arranged at the lower end 220 of the upper hand frame 200 is blocked by the 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 relatively to the first position, and the frame 1 is in the unfolded state. At the same time, the driving block 210 receives the biasing force of the compression spring S2 and continuously abuts against the block portion 312 along the inclined chute 310, so that the upper hand frame 200 and the lower hand frame 300 are held at the first position, and the frame 1 is held in the unfolded state.

[0036] When the user is ready to fold the frame 1, he / she applies an acting force to the frame 1 to relatively rotate the upper hand frame 200 and the lower hand frame 300 from the first position to the second position, thereby overcoming the elastic force of the compression spring S2 and sliding the driving block 210 upward along the inclined chute 310 until the driving block 210 reaches the highest point 311 of the inclined chute 310 as shown in Fig. 9 (the highest point 311 is not shown in Fig. 9 because it is covered by the driving block 210). At this time, the compression spring S2 is compressed to the minimum, and the elastic force that the compression spring S2 exerts on the driving block 210 is also maximized. Then, after the upper hand frame 200 and the lower hand frame 300 rotate relatively continuously toward the second position so that the driving block 210 exceeds the highest point 311, the user does not need to apply any force to the frame 1, and the driving block 210 slides downward along the inclined chute 310 by the elastic force of the compression spring S2, so that the lower end 220 of the upper hand frame 200 rotates relative to the upper end 330 of the lower hand frame 300. As shown in FIG. 10, the upper hand frame 200 and the lower hand frame 300 rotate relatively continuously toward the second position until the upper hand frame 200 and the lower hand frame 300 rotate relatively to the second position and remain at the second position.

[0037] When the user is ready to unfold Frame 1, the process is reversed for Folded Frame 1.

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

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

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

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

[0042] 11 and 12, the first rod is the lower hand frame 300 of the frame 1, and the second rod is the upper hand frame 200 of the frame 1. The upper end 330 of the lower hand frame 300 and the lower end 220 of the upper hand frame 200 are hingedly connected via a connection axis O' (see FIG. 13).

[0043] In the third embodiment, the elastic member is a torsion spring S3 arranged around a connection axis O'. A first end of the torsion spring S3 is connected to the lower end 220 of the upper hand frame 200, and a second end of the torsion spring S3 is connected to the upper end 330 of the lower hand frame 300, and the torsion spring S3 can drive 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, so that the upper hand frame 200 and the lower hand frame 300 rotate relatively to one of a first position or a second position.

[0044] 13, for example, 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 relatively rotating the upper hand frame 200 and the lower hand frame 300 to the second position, realizing automatic folding of the frame.

[0045] Of course, the torsion spring S3 may be set to be in a stressed state when the frame is in a folded state, in which case, when the user is ready to unfold the frame, the frame can be unlocked in the folded state, and the torsion spring S3 will unlock 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 relatively rotating the upper hand frame 200 and the lower hand frame 300 toward the first position, realizing automatic unfolding of the frame.

[0046] Unlike the first and second embodiments, the auxiliary mechanism according to the third embodiment of the present disclosure is configured such that the torsion spring S3 enables the upper hand frame 200 and the lower hand frame 300 to rotate relatively toward either the first or second position.

[0047] In addition, 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, respectively, and then both ends of the torsion spring S3 can be inserted into the respective holes. Alternatively, fixed 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, respectively, and then both ends of the torsion spring S3 can be coupled to the corresponding fixed posts.

[0048] 11 and 15 to 17 show an assist mechanism according to a fourth embodiment of the present disclosure.

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

[0050] 11 and 15, the first rod is the lower hand frame 300 of the frame 1, and the second rod is the front wheel bracket 400 of the frame 1. The lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 are hingedly connected via a connection axis O''.

[0051] In the fourth embodiment, the elastic member is a torsion spring S3' provided around the connection axis O''. However, unlike the third embodiment, as shown in Figs. 16 and 17, the coupling end face of the lower end 340 of the lower hand frame 300 is fixed to the first sheet member 320, and the coupling end face of the upper end 420 of the front wheel bracket 400 is fixed to the second sheet member 410. Since one end of the torsion spring S3' is connected to the first sheet member 320 and the other end is connected to the second sheet 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 relatively to one of the first position or the 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 connection axis O'', thereby allowing both the lower hand frame 300 and the front wheel bracket 400 to rotate relative to the rear wheel bracket 500.

[0053] As shown in FIG. 16 and FIG. 17, in order to realize synchronous reverse rotation of the lower hand frame 300 and the front wheel bracket 400 relative to the rear wheel bracket 500, the first sheet member 320 is provided with a first folding groove 321 that penetrates the first sheet member 320 and extends around the connecting axis O'', and the second sheet member 410 is provided with a second folding groove 411 that penetrates the second sheet member 410 and extends around the connecting axis O''. The second folding groove 411 and the first folding groove 321 have corresponding radial positions with respect to the connecting axis O''. Furthermore, the first folding groove 321 and the second folding 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, and the link gear 510 is arranged to be inserted into the overlapping portion.

[0054] Furthermore, each of the first folding groove 321 and the second folding groove 411 has a rack structure that engages with the link gear 510, so that the rotation of the first folding groove 321 can cause the second folding groove 411 to rotate synchronously in reverse via the link gear 510, so that the first sheet member 320 in which the first folding groove 321 is located and the second sheet member 410 in which the second folding groove 411 is located rotate synchronously in reverse around the axis O'', i.e., the lower end 340 of the lower hand frame 300 and the upper end 420 of the front wheel bracket 400 rotate synchronously in reverse, whereby the lower hand frame 300 and the front wheel bracket 400 rotate synchronously in reverse relative to the rear wheel bracket 500. In FIG. 16 and FIG. 17, the rack structure of the first folding groove 321 is disposed on the outside of the first folding groove 321 away from the connection axis O'', and the rack structure of the second folding groove 411 is disposed on the inside of the second folding groove 411 close to the connection axis O'', so that the link gear 510 ensures that the first folding groove 321 and the second folding groove 411 rotate in opposite directions relative to each other, and 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 present disclosure is not limited thereto. For example, the rack structure of the first folding groove 321 may be disposed on the inside of the first folding groove 321 close to the connection axis O'', and the rack structure of the second folding groove 411 may be disposed on the outside of the second folding groove 411 away from the connection axis O'', which can also achieve the same effect. Here, "synchronously" means that the related rotations or rotations are performed at the same angle and speed.

[0055] Next, the work procedure will be described in detail.

[0056] 16, at this time, the frame is in the unfolded state, the torsion spring S3' is in a force-receiving state, and the link gear 510 is located at the overlapping portion between the front end of the first folding groove 321 and the rear end of the second folding 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 sheet member 320 and the second sheet member 410 in the opposite directions about the connection 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 causing the lower hand frame 300 and the front wheel bracket 400 to rotate relative to the rear wheel bracket to a second position. During 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 sheet member 320 located at the lower end 340 of the lower hand frame 300 rotates around the connection axis O'' together with the first folding groove 321 located on the first sheet member 320. Since the rack structures of the first folding groove 321 and the second folding groove 411 are both engaged with the link gear 510, in the rotation of the first folding groove 321, the rack structure of the first folding groove 321 rotates the link gear 510 itself, and the rotation of the link gear 510 rotates the second folding groove 411 and the second sheet member 410 located therein in reverse around the connection axis O'' through the rack structure of the second folding groove 411, thereby causing the upper end 420 of the front wheel bracket 400 to rotate in reverse relative to the upper end 520 of the rear wheel bracket 500. Therefore, as shown in FIG. 17, the lower hand frame 300 and the front wheel bracket 400 rotate in opposite directions in synchronization with the rear wheel bracket 500, realizing automatic folding of the frame.

[0057] Of course, the torsion spring S3' can also be arranged to be in a stressed state when the frame is in the folded state shown in Fig. 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' will drive the first sheet member 320 and the second sheet member 410 to rotate relative to each other about the connection 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 causing the lower hand frame 300 and the front wheel bracket 400 to rotate relatively toward the first position. The latter process is the reverse process of the above-mentioned process of folding the frame.

[0058] As described above, according to the assist mechanism of the present disclosure, the cart frame can be easily folded or unfolded, making use of the cart more convenient and reliable.

[0059] Since the features of the present disclosure can be embodied in various forms without departing from the characteristics of the present disclosure, it should also be understood that, unless otherwise indicated, the above-described embodiments are not limited to the above details, but should be broadly interpreted within the scope defined in the appended claims. Accordingly, all modifications and changes that come within the scope and limits of the claims, or equivalents of these scopes and limits, should be covered by the appended claims. [Explanation of symbols]

[0060] 1 Frame 100 Support Frame 200 Upper Hand Frame 210 Drive Block 211 Apex 212 Bottom end 220 Lower end of upper hand frame 220A Second coupling end face 300 Lower Hand Frame 310 Inclined Shot 311 Highest score 312 Block section 320 First sheet member 321 First bending 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 bending groove 420 Top end of front wheel bracket 500 Rear wheel bracket 510 Link Gear 520 Upper end of rear wheel bracket S1 Extension spring S2 Compression Spring S3, S3' Torsion spring L1, L2, L3 Extension length of tension spring O, O', O'' connecting shaft

Claims

1. An assist mechanism that assists in folding or unfolding the cart frame, the frame includes a first rod and a second rod that rotate relative to each other, and 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 assist mechanism includes an elastic member, and the elastic member drives the first rod and the second rod to rotate relatively toward the first position or the second position. An auxiliary mechanism characterized by:

2. 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, when the support frame and the upper hand frame rotate relatively to the first position or the second position, the extension length of the tension spring is smaller than the maximum length of the tension spring extended when the support frame and the upper hand frame rotate relatively; 2. The assist mechanism according to claim 1.

3. One end of the first rod and one end of the second rod are coupled via a connecting shaft, and the first rod and the second rod are rotatable relative to each other around the connecting shaft.

3. The auxiliary mechanism according to claim 1 or 2.

4. The first rod is a lower hand frame of the frame, and the second rod is an upper hand frame of the frame; The assist mechanism further includes an annular inclined chute and a drive block. The inclined chute is located on a first coupling end surface at the upper end of the lower hand frame and surrounds the connecting shaft, and the inclined chute is inclined in a rotational direction to have a highest point; The driving block is disposed on a second coupling end surface at the lower end of the upper hand frame, and the driving block is extendable and retractable from the second coupling end surface, and the top end of the driving block slides while abutting against the inclined chute; the elastic member is a compression spring disposed inside the lower end of the upper hand frame, the compression spring acts on the lower end of the drive block to drive the drive block to extend from the second coupling end face and press against the inclined chute, and the drive block slides along the inclined chute to rotate the lower end of the upper hand frame relative to the upper end of the lower hand frame; 4. The assist mechanism according to claim 3.

5. The inclined chute is provided with a block portion, and 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 by blocking the driving block with the block portion.

5. The assist mechanism according to claim 4.

6. The first rod is a lower hand frame of the frame, and the second rod is an upper hand frame of the frame; The elastic member is a torsion spring provided around the connection shaft, one end of the torsion spring is connected to a lower end of the upper hand frame, and the other end of the torsion spring is connected to an upper end of the lower hand frame, so that 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 relatively rotate toward one of the first position or the second position.

6. The assist mechanism according to claim 3, wherein the auxiliary mechanism is a movable member.

7. The first rod is a lower hand frame of the frame, the second rod is a front wheel bracket of the frame, and the elastic member is a torsion spring provided around the connecting shaft; A coupling end surface at a lower end of the lower hand frame is fixed to a first seat member, and a coupling end surface at an upper end of the front wheel bracket is fixed to a second seat member, One end of the torsion spring is connected to the first sheet member, and the other end of the torsion spring is connected to the second sheet member, whereby 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, and the lower hand frame and the front wheel bracket rotate relatively toward one of the first position or the second position.

4. The assist mechanism according to claim 3.

8. 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, so that the lower hand frame and the front wheel bracket can rotate relative to the rear wheel bracket; 8. The assist mechanism according to claim 7.

9. the first sheet member is provided with a first folding groove extending around the connection axis and penetrating the first sheet member, the second sheet member is provided with a second folding groove extending around the connection axis and penetrating the second sheet member, the second folding groove and the first folding groove have corresponding radial positions with respect to the connection axis, and the first folding groove and the second folding groove are provided to have 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 folding groove and the second folding groove has a rack structure that engages with the link gear, and when the first folding groove of the first sheet member rotates around the connection axis, the rack structure of the first folding groove drives the link gear, and the link gear drives the second folding groove of the second sheet member to rotate in a reverse direction around the connection axis via the rack structure of the second folding groove, thereby causing the first sheet member and the second sheet member to rotate in a reverse direction synchronously around the connection axis.

9. The auxiliary mechanism according to claim 7 or 8.

10. The assist mechanism according to any one of claims 1 to 9 assists in folding or unfolding the frame. A cart characterized by:

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