Folding shopping cart and pull rod locking mechanism thereof

Abstract

The utility model belongs to the technical field of shopping carts, and particularly relates to a folding shopping cart and a pull rod locking mechanism thereof. The pull rod is rotationally connected to the box panel and used for abutting against the box panel or being obliquely arranged at the front end of the box panel through rotation of the pull rod; the positioning seat is sleeved on the pull rod and can slide along the pull rod; the locking assembly comprises a locking block and a locking plate, the locking block is rotationally arranged on the positioning seat, a locking boss is arranged on the locking block, a locking notch groove is formed in the locking boss, and the locking plate is arranged on the box body; according to the utility model, the positioning seat can be fixed only by rotating the locking block, and the pull rod is fixed on the box panel through the positioning seat, so that the pull rod is fixed; on the contrary, unlocking of the pull rod can be achieved through the locking block, and compared with an existing structure, the structure of the locking block is more convenient to operate, and labor is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shopping carts, and particularly relates to a folding shopping cart and a locking mechanism for its pull rod. Background Art

[0002] Chinese Utility Model 2022200658321 discloses a pull rod retractable storage box, which includes a box body and a pull rod assembly. A pull rod groove for the pull rod assembly to be embedded is provided on the rear box board of the box body. The pull rod assembly is hinged to the lower part of the pull rod groove, and a limiting component for restricting the pull rod assembly in the pull rod groove is arranged between the pull rod groove and the pull rod assembly. The existing limiting structure has a complex structure, which affects the assembly efficiency of the product. Summary of the Invention

[0003] The purpose of the utility model is to provide a locking mechanism for the pull rod of a folding shopping cart with a simpler structure.

[0004] The purpose of the utility model is achieved as follows:

[0005] A locking mechanism for the pull rod of a folding shopping cart, comprising:

[0006] A box panel;

[0007] A pull rod, rotatably connected to the box panel, for abutting against the box panel by its rotation or tilting at the front end of the box panel;

[0008] A positioning seat, sleeved on the pull rod and slidable along the pull rod; and

[0009] A locking component, the locking component includes a locking block and a locking piece. The locking block is rotatably arranged on the positioning seat. A locking boss is provided on the locking block, and a locking notch groove is formed in the locking boss. The locking piece is arranged on the box body, and the locking piece is used to enter the locking boss through the locking notch groove and be limited by the rotation of the locking block with the locking boss;

[0010] A first engaging boss perpendicular to the locking boss is further provided at the end of the locking boss, and a second engaging boss perpendicular to the locking piece is provided at the end of the locking piece. The second engaging boss is used to be limited relative to the first engaging boss after the locking block rotates.

[0011] Furthermore, a convex block is further provided on the box panel, and the locking piece is provided on the top of the convex block. The positioning seat slides to the top of the convex block and is supported by the convex block.

[0012] Furthermore, a positioning groove is provided on the top of the convex block, and a positioning convex part opposite to the positioning groove is provided on the positioning seat. When the positioning seat slides to the top of the convex block, the positioning convex part is located in the positioning groove.

[0013] Further, a drawbar groove for the drawbar to be inserted is formed on the box panel, a sliding seat is formed on the side wall of the drawbar groove, and a positioning card slot consistent with the orientation of the drawbar groove is formed in the sliding seat; a positioning projection is provided on the positioning seat, and an inlet for the positioning projection to slide into the positioning card slot and a supporting portion for supporting a pin in the positioning card slot are respectively provided at both ends of the positioning card slot.

[0014] Further, a abutting boss is further provided on the positioning seat for restricting the movement of the positioning seat by abutting against one end of the sliding seat through the abutting boss.

[0015] Further, a first extending edge arranged radially is further provided on the positioning projection, and a second extending edge opposite to the first extending edge is provided on the positioning card slot; when the positioning projection is located in the positioning card slot, the first extending edge abuts against the inner side of the second extending edge for limiting.

[0016] Further, a rotating seat is provided on the positioning seat, and the locking block is rotatably arranged on the rotating seat; a limiting boss is provided on the rotating seat, a limiting notch groove is provided on the limiting boss, and a limiting piece located in the limiting notch groove is provided on the locking block for abutting against the limiting boss when the locking block rotates to limit the rotation of the locking block.

[0017] Further, the limiting boss is circular, and the limiting notch groove occupies one quarter of the limiting boss.

[0018] Further, a transfer hole is provided in the rotating seat, an annular rotating boss is provided in the locking block, a limiting head is provided at the end of the rotating boss, a fastener connected to the locking block and an annular card slot for accommodating the end of the rotating boss are provided in the limiting head; the rotating boss is used to be arranged in the transfer hole to realize the rotational cooperation between the locking block and the rotating seat.

[0019] A folding shopping cart includes a folding box body, and the folding box body includes the above-mentioned drawbar locking mechanism.

[0020] The prominent and beneficial technical effects of the present utility model compared with the prior art are:

[0021] In this patent, the positioning seat can be fixed only by rotating the locking block, and the drawbar can be fixed on the box panel through the positioning seat to realize the fixation of the drawbar; conversely, the drawbar can be unlocked by the locking block. Compared with the existing structure, the structure of the locking block is more convenient and labor-saving to operate, not easy to fall off, and the overall structure is hidden in the locking block, not affected by the outside world, and the overall structure is more stable, so that its service life is longer.

[0022] This patent adopts the form of sliding positioning seat, which is faster to operate and convenient for users to quickly switch between two usage modes of the shopping cart; the overall structure is simple and easier to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a foldable shopping cart.

[0024] Figure 2 It is a schematic diagram of the structure of the folding shopping cart after the pull rod is rotated.

[0025] Figure 3 It is a schematic diagram of the structure of the box.

[0026] Figure 4 This is a schematic diagram of the disassembly of the positioning seat.

[0027] Figure 5 It is a structural diagram of the locking block.

[0028] Figure 6 It is a structural schematic diagram of the positioning seat.

[0029] Figure 7 It is a schematic diagram of the structure when the locking block and the locking plate are locked.

[0030] Figure 8 It is a schematic diagram of the structure when the locking block and the locking plate are not locked.

[0031] Figure 9 It is a cross-sectional schematic diagram after the locking block and the positioning seat are installed.

[0032] The meaning of the symbols in the figure:

[0033] 1. Folding box body; 11. Roller; 12. Pull rod slot; 13. Sliding seat; 131. Positioning slot; 132. Inlet; 133. Support part; 134. Second extension edge; 14. Protrusion; 141. Positioning slot; 15. Box panel;

[0034] 2. pull rod; 21. left rod; 22. right rod; 23. handle bar;

[0035] 3. Positioning seat; 31. Positioning convex block; 311. First extension edge; 32. Abutting boss; 33. Left hole portion; 34. Right hole portion; 35. Positioning convex portion; 36. Rotating seat; 361. Positioning boss; 362. Positioning notch groove; 363. Transfer hole;

[0036] 4. Locking block; 41. Locking boss; 411. First engaging boss; 42. Locking notch; 44. Limiting piece; 45. Rotating boss; 46. Limiting head; 47. Fastener; 48. Annular slot; 49. Protective boss; 491. Protective notch;

[0037] 5. Locking piece; 51. Second engaging boss. Specific embodiments

[0038] The present utility model will be further described below in conjunction with specific embodiments:

[0039] A folding shopping cart and its handle locking mechanism, as Figure 1 shown, the folding shopping cart described in this patent is made of plastic material, which includes the folding box body 1 described in this patent. A handle 2 is provided on the folding box body 1, and rollers 11 are provided at the bottom of the folding box body 1. The entire folding box body 1 is pulled by the handle 2, and the folding box body 1 is rolled by the rollers 11 to cooperate with the handle 2 to realize the movement of the shopping cart. As Figure 1 、 2 shown, in this patent, the folding box body 1 is square, which has a box panel 15. A rotating shaft is provided at the bottom end of the box panel 15, and the handle 2 is rotatably connected to the rotating shaft. The handle 2 can be rotated to lean against the box panel 15 or tilted at the front end of the box panel 15, so that the folding shopping cart in this patent enters the state as shown in Figure 1 、 2 , which can be pulled by the user.

[0040] Further, it further includes a positioning seat 3. The positioning seat 3 is sleeved on the handle 2 and can slide along the handle 2; a positioning slot 131 is provided on the folding box body 1, and a positioning protrusion 31 is provided on the positioning seat 3, which is used to fix the positioning seat 3 on the box panel 15 by sliding the positioning protrusion 31 into the positioning slot 131.

[0041] Combined with Figures 2 - 4 shown, in this patent, the handle 2 has a left rod portion 21 and a right rod portion 22. A handle rod 23 connecting the two is provided at the top of the left rod portion 21 and the right rod portion 22. The handle rod 23 is used for the user to grasp to operate the entire folding shopping cart. In this patent, a vertical handle slot 12 is provided on the box panel 15. The handle 2 can be rotated to be embedded in the handle slot 12, so that the handle 2 is completely embedded in the front side wall of the folding box body 1; at this time, the positioning slot 131 is located on the side wall of the handle slot 12, and the positioning seat 3 sliding on the handle 2 can be embedded in the positioning slot 131 during its sliding.

[0042] Combined with Figure 2 、 4As shown, since the pull rod 2 in this patent includes a left rod portion 21 and a right rod portion 22, a convex block 14 is further provided on the side wall of the folding box body 1. The convex block 14 is located within the pull rod groove 12, so that accommodation areas adapted to the left rod portion 21 and the right rod portion 22 are formed on both sides of the convex block 14. The positioning seat 3 is installed on the top of the convex block 14, and the convex block 14 can be used to support the positioning seat 3. The positioning seat 3 is strip-shaped, and correspondingly, a left hole portion 33 and a right hole portion 34 for the left rod portion 21 and the right rod portion 22 to pass through are provided on the positioning seat 3. Through the hole-axis cooperation between the left rod portion 21, the right rod portion 22 and the left hole portion 33, the right hole portion 34, the entire positioning seat 3 can slide along the pull rod 2.

[0043] Further, referring to Figures 4 - 6 , a sliding seat 13 is formed on the side wall of the pull rod groove 12. The sliding seat 13 is directly formed within the pull rod groove 12 during die forming. The sliding seat 13 is square as a whole, and a positioning card slot 131 with the same orientation as the pull rod groove 12 is formed therein; the pull rod groove 12 in this patent is vertically oriented. Correspondingly, the positioning card slot 131 is also vertically oriented. The positioning card slot 131 is open towards the inside of the pull rod groove 12, and an inlet 132 for the positioning convex block 31 to slide into the positioning card slot 131 and a supporting portion 133 for supporting the pin within the positioning card slot 131 are respectively provided at both ends thereof, that is, the inlet 132 and the supporting portion 133 are respectively located at the upper and lower ends of the positioning card slot 131.

[0044] As Figure 3 shown, the length of the positioning seat 3 is adapted to the overall length of the pull rod groove 12, and it is located above the convex block 14; the positioning convex blocks 31 are located at the left and right ends of the positioning seat 3. Correspondingly, sliding seats 13 are provided on both side walls of the pull rod groove 12. The positioning convex blocks 31 at the left and right ends of the positioning seat 3 are used to be snapped into the sliding seats 13. That is, when the pull rod 2 rotates and is located within the pull rod groove 12, by sliding the positioning seat 3, the positioning convex blocks 31 on the positioning seat 3 enter the positioning card slot 131 from the inlet 132 and are supported on the supporting portion 133. At this time, the positioning seat 3 is limited within the pull rod groove 12 due to the positioning convex blocks 31 and the positioning card slot 131, and the positioning seat 3 is also sleeved on the pull rod 2, thus playing a role in restricting the pull rod 2 to restrict the pull rod 2 within the pull rod groove 12 and prevent it from rotating outwards to open; and when the user needs to tilt the pull rod 2 at the front end of the folding box body 1 to pull the folding box body 1, only need to operate the positioning seat 3 to slide so that the positioning seat 3 is no longer fixed within the positioning card slot 131. At this time, the user can rotate the pull rod 2 to make the pull rod 2 tilt at the front end of the folding box body 1 for use as Figure 2 shown.

[0045] The two usage modes of the two drawbars 2 respectively correspond to the two usage modes of the folding shopping cart described in this patent, and can respectively correspond to different working conditions. Users can flexibly switch to achieve the effect of labor saving. Since this patent adopts the form of the sliding of the positioning seat 3, the operation is faster, which is convenient for users to quickly switch between the two usage modes of the shopping cart; the overall structure is simple and easier to manufacture.

[0046] Further, a first extension edge 311 arranged radially is further provided on the positioning convex block 31, and a second extension edge 134 opposite to the first extension edge 311 is provided on the positioning card slot 131; when the positioning convex block 31 is located in the positioning card slot 131, the first extension edge 311 is located inside the second extension edge 134 and abuts against it for limiting. As Figure 4 shown, the first extension edge 311 is vertically arranged on the positioning convex block 31, the second extension edge 134 is located in the positioning card slot 131, and a space for accommodating the second extension edge 134 is formed inside the second extension edge 134. The stability of the installed positioning seat 3 can be further increased by the end surfaces of the first extension edge 311 and the second extension edge 134 abutting against each other.

[0047] Further, a locking assembly is further provided on the folding shopping cart for locking the positioning seat 3 after the positioning seat 3 positions the drawbar 2; it includes a locking block 4 and a locking piece 5. The locking block 4 is rotatably arranged on the positioning seat 3. A locking boss 41 is provided on the locking block 4, and a locking notch groove 42 is formed on the locking boss 41. The locking piece 5 is arranged on the folding box body 1, and the locking piece 5 is used to enter the locking boss 41 through the locking notch groove 42 and be limited with the locking boss 41 by the rotation of the locking block 4.

[0048] Combined with Figures 4 - 9As shown, a rotating seat 36 is provided on the positioning seat 3, and the locking block 4 is rotatably arranged on the rotating seat 36. A transfer hole 363 is provided in the rotating seat 36, and a rotating boss 45 inserted into the transfer hole 363 is provided in the locking block 4. A limiting head 46 is provided at the end of the rotating boss 45. A fastener 47 connected to the locking block 4 and an annular card slot 48 for accommodating the end of the rotating boss 45 are provided in the limiting head 46. The rotating boss 45 is used to be arranged in the transfer hole 363 to realize the rotational cooperation between the locking block 4 and the rotating seat 36. In this patent, the fastener 47 is a screw. The outer edge of the limiting head 46 abuts against the outer edge of the transfer hole 363 of the rotating seat 36 for positioning. When the rotating boss 45 is inserted into the transfer hole 363, the fastener 47 passes through the limiting head 46 and the rotating boss 45 in sequence to connect the two, and the rotating boss 45 is located in the transfer hole 363 to be used as a rotating shaft to realize rotation. Generally, a threaded hole connected to the fastener 47 is provided in the rotating boss 45, and the connection with the screw is realized through the threaded hole for fixation. When the rotating boss 45 is connected to the limiting head 46, the end of the rotating boss 45 is also clamped into the annular card slot 48 for positioning and fixation.

[0049] Furthermore, the locking block 4 is circular, and an annular locking boss 41 is provided in the locking block 4. Specifically, the locking boss 41 is arranged around the outside of the rotating boss 45. The locking boss 41 has a locking notch groove 42, and a first engaging boss 411 perpendicular to the locking boss 41 is further provided at the end of the locking boss 41 on one side of the locking notch groove 42. The lock piece 5 is arc-shaped, and a second engaging boss 51 is formed on the arc-shaped lock piece 5. Specifically, the first engaging boss 411 is vertically arranged at the top of the locking boss 41, the second engaging boss 51 is vertically arranged at the top of the lock piece 5, and the size of the lock piece 5 is adapted to the size of the locking notch groove 42.

[0050] When the positioning seat 3 is located on the convex block 14, the lock piece 5 enters the locking block 4 through the locking notch groove 42. At this time, the lock piece 5 and the locking boss 41 are arranged adjacent and misaligned. By rotating the locking block 4, the second engaging boss 51 on the lock piece 5 and the first engaging boss 411 on the locking boss 41 are engaged with each other up and down to realize locking. To sum up, in this patent, the positioning seat 3 can be fixed only by rotating the locking block 4, and the pull rod 2 can be fixed on the box panel 15 through the positioning seat 3 to realize the fixation of the pull rod 2. On the contrary, the pull rod 2 can be unlocked through the locking block 4. Compared with the existing structure, the structure of the locking block 4 is more convenient and labor-saving to operate, not easy to fall off, and the overall structure is hidden in the locking block 4, not affected by the outside world, and the overall structure is more stable, so that its service life is higher.

[0051] Further, a limiting boss 361 is provided on the rotating base 36, and a limiting notch groove 362 is provided on the limiting boss 361. A limiting piece 44 located in the limiting notch groove 362 is provided on the locking block 4, and is used to abut against the limiting boss 361 when the locking block 4 rotates to limit the rotation of the locking block 4. As Figure 5 、 7 、as shown in FIG. 8, the limiting piece 44 is a square plate body provided above the locking boss 41, and rotates along with the rotation of the rotating base 36. In this embodiment, the limiting notch groove 362 occupies one-fourth of the limiting boss 361, and the movement space of the limiting piece 44 is limited by this limitation, so as to limit the maximum rotation angle of the locking block 4 to degrees, preventing the user from turning the locking block 4 too far and affecting the normal locking of the locking block 4.

[0052] Further, a protective boss 49 is further provided on the locking block 4. The protective boss 49 surrounds the locking boss 41, and a protective notch groove 491 opposite to the locking notch groove 42 is provided on the protective boss 49. The entire locking boss 41 is enclosed in the locking block 4 by the protective boss 49 to prevent the locking structure thereon from being exposed and damaged by external influences.

[0053] Further, a positioning groove 141 is provided at the top of the convex block 14, and a positioning convex portion 35 opposite to the positioning groove 141 is provided on the positioning seat 3. When the positioning seat 3 slides to the top of the convex block 14, the positioning convex portion 35 is located in the positioning groove 141. Both the positioning groove 141 and the positioning convex portion 35 are semi-circular. When the positioning convex portion 35 is located in the positioning groove 141, further positioning is achieved through the fitting of the two.

[0054] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

[0055] It should be noted that the structures, proportions, sizes, etc. depicted in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present utility model can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0056] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element present at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or it can also be indirectly connected to the other element through an intermediate element.

[0057] In addition, the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

Claims

1. A pull rod locking mechanism for a foldable shopping cart, characterized in that: include: Box panel (15); A pull rod (2) is rotatably connected to the box panel (15) and is used to abut against the box panel (15) or tilt at the front end of the box panel (15) through its rotation; A positioning seat (3) is sleeved on the pull rod (2) and can slide along the pull rod (2); as well as A locking assembly, the locking assembly comprising a locking block (4) and a locking plate (5), the locking block (4) being rotatably arranged on the positioning seat (3), the locking block (4) being provided with a locking boss (41), the locking boss (41) being provided with a locking notch groove (42), the locking plate (5) being arranged on the box panel (15), the locking plate (5) being used to enter the locking boss (41) through the locking notch groove (42), and being limited in position with the locking boss (41) by the rotation of the locking block (4); A first engaging boss (411) perpendicular to the locking boss (41) is also provided at the end of the locking boss (41), and a second engaging boss (51) perpendicular to the locking plate (5) is provided at the end of the locking plate (5), the second engaging boss (51) being used to limit relative to the first engaging boss (411) after the locking block (4) rotates.

2. A pull rod locking mechanism for a foldable shopping cart according to claim 1, characterized in that: The box panel (15) is also provided with a protrusion (14), the top of which is provided with the locking piece (5), and the positioning seat (3) slides to the top of the protrusion (14) and is supported by the protrusion (14).

3. A pull rod locking mechanism for a foldable shopping cart according to claim 2, characterized in that: A positioning groove (141) is provided at the top of the convex block (14), and a positioning convex portion (35) on the positioning seat (3) opposite to the positioning groove (141) is used for positioning the positioning convex portion (35) in the positioning groove (141) when the positioning seat (3) slides to the top of the convex block (14).

4. The pull rod locking mechanism of a foldable shopping cart according to claim 1, characterized in that: The box panel (15) is formed with a rod groove (12) for the rod (2) to be inserted, a sliding seat (13) is formed on the side wall of the rod groove (12), and a positioning groove (131) with the same direction as the rod groove (12) is formed in the sliding seat (13); the positioning seat (3) is provided with a positioning protrusion (31), and an inlet (132) for the positioning protrusion (31) to slide into the positioning groove (131) and a support portion (133) for supporting a pin located in the positioning groove (131) are respectively provided at both ends of the positioning groove (131).

5. A pull rod locking mechanism for a foldable shopping cart according to claim 4, characterized in that: The positioning seat (3) is also provided with abutting boss (32) for limiting the movement of the positioning seat (3) by abutting the abutting boss (32) against one end of the sliding seat (13).

6. The pull rod locking mechanism of a foldable shopping cart according to claim 4, characterized in that: The positioning protrusion (31) is also provided with a radially arranged first extension edge (311), and the positioning slot (131) is provided with a second extension edge (134) opposite to the first extension edge (311); when the positioning protrusion (31) is located in the positioning slot (131), the first extension edge (311) is located on the inner side of the second extension edge (134) and abuts against it for limiting position.

7. The pull rod locking mechanism of a foldable shopping cart according to claim 1, characterized in that: The positioning seat (3) is provided with a rotating seat (36), and the locking block (4) is rotatably arranged on the rotating seat (36); the rotating seat (36) is provided with a limiting boss (361), and the limiting boss (361) is provided with a limiting notch groove (362); the locking block (4) is provided with a limiting sheet (44) located in the limiting notch groove (362) and used for abutting against the limiting boss (361) when the locking block (4) rotates to limit the rotation of the locking block (4).

8. The pull rod locking mechanism of a foldable shopping cart according to claim 7, characterized in that: The limiting boss (361) is circular, and the limiting notch groove (362) occupies one quarter of the limiting boss (361).

9. The pull rod locking mechanism of a foldable shopping cart according to claim 7, characterized in that: The rotating seat (36) is provided with an adapter hole (363), the locking block (4) is provided with an annular rotating boss (45), the end of the rotating boss (45) is provided with a limit head (46), the limit head (46) is provided with a fastener (47) connected to the locking block (4), and an annular groove (48) for accommodating the end of the rotating boss (45); the rotating boss (45) is used to be arranged in the adapter hole (363) to realize the rotational cooperation between the locking block (4) and the rotating seat (36).

10. A foldable shopping cart, comprising a foldable box (1), characterized in that: The folding box (1) comprises a pull rod locking mechanism as claimed in any one of claims 1 to 9.

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