Handrail folding structure of trolley

Abstract

The invention discloses a handrail folding structure of a small handcart, the small handcart comprises a vertically arranged frame and a bearing plate rotatably arranged at the bottom end of the frame, and a handrail is arranged on the frame; the handrail comprises two connecting sections and a transverse section, the transverse section is in a U shape, the two connecting sections are symmetrically arranged and connected to the side portion of the frame in a positioning mode, and compared with the transverse section and the connecting section which are rigidly fixed in the prior art, the transverse section can be located at any angle and maintain the state, so that an operator can select and adjust by himself / herself; and the angle between the transverse section and the connecting section is formed so as to adapt to different use scenes, and meanwhile, the packaging difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of small trolleys, in particular to a folding structure of a handrail of a small trolley. BACKGROUND

[0002] As a kind of portable transport tool, folding small trolleys play an increasingly important role in modern urban life, warehousing logistics, moving transportation, shopping and camping, etc. Its core advantage lies in "folding", which can significantly reduce the volume in idle and transportation, facilitate storage in the trunk of a vehicle, the corner of an elevator or a narrow space at home, reduce the storage and carrying cost of users and improve the use convenience. The market competition is fierce, and users' requirements for portability, functionality and ease of use of products are increasing, prompting manufacturers to continuously optimize and innovate in folding structures.

[0003] Although the overall folding design is increasingly mature, the mainstream folding small trolleys on the market have significant defects in the exposed part of the handrail end: the structure design is single and rigidly fixed, and cannot be folded. These protruding handrails are usually fixed-length metal pipes, which constitute the main bottleneck of the reduced volume after folding the small trolley. This directly leads to several pain points: Transportation and warehousing costs rise: even in the folded state, the exposed long handrail makes it impossible to further compress the packaging size, especially, some handrail ends are composed of vertical and horizontal sections. After overall folding, the vertical section is parallel to the frame of the trolley, but the horizontal section will protrude, increasing the single trolley packaging volume and space occupation during logistics transportation (especially e-commerce transportation), and increasing the single piece cost.

[0004] Limited use scenarios: in narrow elevators, crowded carriages and compact storage cabinets, the protruding handrail is easy to knock, hook and even block the passage, reducing the applicability and safety of the product.

[0005] Therefore, how to solve the above-mentioned problems existing in the prior art has become the research subject of the present application. SUMMARY

[0006] The present application provides a folding structure of a handrail of a small trolley, which aims to solve the technical problems proposed in the background.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a trolley with a folding handle structure, the trolley including a vertically arranged frame and a support plate rotatably arranged at the bottom of the frame, and a handle provided on the frame; the handle includes two connecting sections and a transverse section, the transverse section being U-shaped, the two connecting sections being symmetrically arranged and positioned on the side of the frame, each connecting section being arranged along the length direction of the frame, and both ends of the transverse section being connected to the upper ends of the two connecting sections respectively through a folding structure; the folding structure includes a first bushing and a second bushing, the end of the first bushing being hinged to the end of the second bushing, and the other end of the first bushing being connected to the other end of the second bushing, one of which is connected to the end of the connecting section. One part is positioned and connected, and the other part is positioned and connected to the end of the transverse section, so that the connecting section and the transverse section can be in an unfolded state and a folded state; a limiting member is provided at the hinge point of the first bushing and the second bushing, and the limiting member acts on the first bushing and / or the second bushing to limit the relative rotation of the first bushing and the second bushing; in the unfolded state, the transverse section and the connecting section are at a set angle, and the limiting member is configured to limit the rotation of the first bushing and the second bushing so that the transverse section and the connecting section are maintained at the set angle; in order to enter the folded state, by the action of external force, the rotation restriction of the first bushing and the second bushing on the first bushing and the second bushing is released, and the transverse section is pushed to rotate around the hinge point to realize the folding of the transverse section and the connecting section.

[0008] The relevant content in the above plan is explained as follows: Both ends of the transverse section (specifically, the two ends of the U-shaped opening) are connected to the upper ends of the two connecting sections respectively through a folding structure.

[0009] In the above scheme, when the handrail is in use, the horizontal section can be driven to rotate around the hinge point of the first bushing and the second bushing. During the rotation, the first bushing and the second bushing can be positioned to a set angle by the limiting component, such as 60 degrees, 120 degrees, or the horizontal section and the connecting section can be parallel.

[0010] The reason for the lateral section being tilted is to make it easier for the operator to apply force to the trolley.

[0011] In the above solution, the horizontal section and the connecting section can be adjusted at any position by the cooperation of the limiting member and the first and second bushings of the hinge. Specifically, in the unfolded state, the horizontal section and the connecting section are at a set angle. At this time, the limiting member will restrict the rotation of the first and second bushings so that the horizontal section and the connecting section are kept at the set angle. In this way, the trolley can be used normally. However, once packaging is required, it needs to be put into the folded state. At this time, by applying external force, the rotation restriction of the first and second bushings by the limiting member is released, and the horizontal section is pushed to rotate around the hinge point until it is parallel to the connecting section, thus completing the folding.

[0012] Different from the rigidly fixed transverse section and connecting section in the prior art, the transverse section in the application can be at any angle and maintain the state, so that the operator can self-select and adjust the angle between the transverse section and the connecting section to adapt to different use scenarios while reducing the difficulty of packaging.

[0013] Further technical solutions, the hinge point of the first shaft sleeve and the second shaft sleeve is provided with a through hole, and the first shaft sleeve and the second shaft sleeve are hinged by a bolt, the bolt is arranged in the through hole and coaxially arranged with the through hole; The limiting member is arranged on the bolt and acts on the first shaft sleeve and / or the second shaft sleeve, so that the rotation of the first shaft sleeve and the second shaft sleeve is limited.

[0014] In the embodiment, the hinge mode of the first shaft sleeve and the second shaft sleeve is that 1, the hinge is achieved by a bolt, 2, holes are arranged at the same positions of opposite ends of the first shaft sleeve and the second shaft sleeve, a hollow web-shaped clamping column is arranged in the holes, and the first shaft sleeve and the second shaft sleeve are clamped by the web head of the hollow web-shaped clamping column.

[0015] In the embodiment, the limiting member is configured to limit the rotation of the first shaft sleeve and the second shaft sleeve, and specifically, 1, the limiting member can be a nut arranged at both ends of the bolt, and the hinge end of the first shaft sleeve and the second shaft sleeve is clamped by rotating the nut to limit the rotation; 2, the limiting member can be a bolt arranged in the hollow web-shaped clamping column, a nut is arranged on the outside of the bolt, and the nut is pressed towards the first shaft sleeve and the second shaft sleeve by rotating the nut to limit the rotation.

[0016] The above is several embodiments of the limiting member limiting the rotation of the first shaft sleeve and the second shaft sleeve in the application.

[0017] Based on the above design, the first shaft sleeve and the second shaft sleeve can be better hinged.

[0018] Meanwhile, different from the hollow web-shaped clamping column proposed above, the bolt has higher connection strength (the bolt does not protrude in the application, reducing the probability of collision).

[0019] Further technical solutions, the hinge end side of the first shaft sleeve is concave and provided with a first clamping groove; the hinge end side of the second shaft sleeve is concave and provided with a second clamping groove, the groove opening of the first clamping groove is arranged towards the groove opening of the second clamping groove; when the first shaft sleeve and the second shaft sleeve are hinged, the first clamping groove and the second clamping groove are aligned with each other and form an annular groove structure, the through hole is coaxially arranged with the first clamping groove and the second clamping groove; the limiting member is arranged in the annular groove structure and is sleeved on the outer side wall of the bolt, and the limiting member is configured to slide along the bolt axis.

[0020] With the above design, the limiting part can be hidden in the annular groove structure to prevent the limiting part from being damaged due to external impact.

[0021] Further, the limiting part comprises a sliding block which is sleeved on the outer side wall of the bolt and coaxially arranged with the bolt, and the sliding block is arranged in the annular groove structure; the sliding block is configured to reciprocate only along the axial direction of the bolt; a plurality of protruding portions are radially protruded on the outer circumferential side of the sliding block, and all the protruding portions are uniformly distributed around the axis of the sliding block; a plurality of clamping grooves are arranged in the annular groove structure, and each clamping groove is one-to-one matched with each protruding portion; the rotation movement of the first shaft sleeve and / or the second shaft sleeve relative to the bolt is constrained by the cooperation of the protruding portion and the clamping groove.

[0022] With the above design, the first shaft sleeve and / or the second shaft sleeve can be quickly and simply constrained in the annular groove structure.

[0023] The technical solution of the limiting part limiting the first shaft sleeve or the second shaft sleeve alone can be as follows: taking the limiting of the first shaft sleeve as an example, the limiting of the second shaft sleeve is the same principle, specifically, the bolt is fixedly arranged with the second shaft sleeve, and the fixing mode can adopt clamping block limiting, glue bonding, interference fit, threaded fixing, etc., that is, the second shaft sleeve cannot rotate around the bolt, but only the second shaft sleeve can rotate with the bolt. In this way, it is only necessary to limit the first shaft sleeve alone.

[0024] At this time, the clamping groove is arranged on the first shaft sleeve, and since the sliding block is configured to reciprocate only along the axial direction of the bolt, the first shaft sleeve can be limited by inserting the protruding portion into the clamping groove.

[0025] Further, the clamping groove comprises a plurality of accommodating clamping grooves and a plurality of limiting clamping grooves; each accommodating clamping groove and each limiting clamping groove are arranged along the axial direction of the sliding block; wherein the accommodating clamping groove is formed by the inner side wall of the second clamping groove being concave; the limiting clamping groove is formed by the inner side wall of the first clamping groove being concave; when the protruding portion is matched with the clamping groove, each accommodating clamping groove and each limiting clamping groove are aligned with each other, and the protruding portion is simultaneously located in the aligned accommodating clamping groove and limiting clamping groove to constrain the relative rotation of the first shaft sleeve and the second shaft sleeve.

[0026] With the above design, the limiting part can limit the first shaft sleeve and the second shaft sleeve at the same time. Unlike the solution of limiting the two separately, the solution of limiting the two simultaneously has lower requirements for the bolt and the through hole processing, as long as the bolt can be accommodated and guided to pass through.

[0027] Specifically, in the unfolded state, the transverse section and the connecting section are at a set angle, at this time, each accommodating slot and each limiting slot are aligned with each other, and the protruding part is simultaneously in the aligned accommodating slot and limiting slot to constrain the relative rotation of the first shaft sleeve and the second shaft sleeve, so that once the first shaft sleeve or the second shaft sleeve is stressed, a rotation tendency is generated, and since the protruding part simultaneously abuts against the inner wall of the accommodating slot and the limiting slot, the purpose of simultaneously limiting the first shaft sleeve and the second shaft sleeve is achieved.

[0028] Once it is needed to guide the transverse section and the connecting section into the folded state, the protruding part is driven into the accommodating slot, so that the transverse section and the connecting section can be relatively rotated.

[0029] Further, the slot depth of the accommodating slot is greater than or equal to the height of the protruding part, and the slot depth of the limiting slot is less than the height of the protruding part.

[0030] With the above design, after the protruding part enters the accommodating slot, it will not contact the limiting slot, thereby preventing the phenomenon that the protruding part contacts the limiting slot when the transverse section and the connecting section are guided into the folded state, so that the transverse section and the connecting section cannot normally rotate.

[0031] Meanwhile, the slot depth of the limiting slot is less than the height of the protruding part, so that when the protruding part completely enters the limiting slot, a part of the protruding part is still clamped in the accommodating slot, thereby maintaining the set angle of the transverse section and the connecting section.

[0032] Further, the limiting member further comprises a resilient member, which is sleeved on the outer peripheral sidewall of the bolt, and the resilient member acts on the sliding block, so that the sliding block and the protruding part have a tendency to always slide from the accommodating slot to the limiting slot; through the action of an external force, the elastic force of the resilient member is overcome, so that the sliding block drags the protruding part to completely enter the accommodating slot.

[0033] With the above design, the protruding part can freely move along the bolt axis, and there is no need to manually adjust the position of the protruding part.

[0034] In the case of guiding the transverse section and the connecting section to maintain the set angle, the resilient member (spring) is in an initial state of being stretched, at this time, the resilient member pushes the sliding block to the bottom of the first slot, at this time, the protruding part completely enters the limiting slot, but since the slot depth of the limiting slot is less than the height of the protruding part, a part of the protruding part is still clamped in the accommodating slot, thereby maintaining the set angle of the transverse section and the connecting section.

[0035] Once the transverse section and the connecting section need to enter the folded state, the sliding block is stressed, which slides along the bolt and compresses the resilient member, at the same time, the sliding block drags the protruding part to completely enter the accommodating slot, and then the transverse section and the connecting section can be relatively rotated.

[0036] Subsequently, once no longer force is applied to the sliding block, the elastic member resets, and the sliding block and the protruding portion slide from the accommodating slot to the limiting slot.

[0037] The movement of the sliding block can be achieved by pressing the pushing column penetrated by the outside.

[0038] In a further technical solution, the surface of the hinged end of the first shaft sleeve and opposite to the first slot is concave and provided with a mounting slot; the mounting slot is coaxial with the penetrating hole; the limiting member further comprises a pushing member arranged in the mounting slot, the pushing member is movably connected in the mounting slot and coaxially arranged with the mounting slot, the pushing member has a penetrating end penetrating the bottom of the mounting slot and abutting against the surface of the sliding block, and the penetrating end is configured to push the sliding block to slide along the outer circumferential side of the bolt.

[0039] In a further technical solution, the end of the penetrating end is provided with a stop portion to limit the penetrating end from sliding out of the mounting slot.

[0040] With the above design, the operator can realize the movement of the sliding block by the pushing member.

[0041] Specifically, if the transverse section and the connecting section need to enter the folded state, the pushing member is directly pressed to make the pushing member enter the mounting slot, and in this process, the penetrating end pushes the sliding block to slide along the outer circumferential side of the bolt.

[0042] Once no longer pressing force is applied to the pushing member, the elastic member resets, and the sliding block and the protruding portion slide from the accommodating slot to the limiting slot, and due to the existence of the stop portion, the penetrating end will not slide out of the mounting slot, but will always maintain the state of abutting against the surface of the sliding block.

[0043] It should be noted that the transverse section and the connecting section are connected with the first shaft sleeve and the second shaft sleeve respectively, and thus the relative rotation of the transverse section and the connecting section is the relative rotation of the first shaft sleeve and the second shaft sleeve.

[0044] The surface of the sliding block is provided with a lower groove for accommodating the stop portion, and the lower groove can accommodate the stop portion, so that the elastic member can completely push the protruding portion on the sliding block into the limiting slot, especially when the upper surface of the sliding block abuts against the bottom of the first slot, the lower groove is needed to accommodate the stop portion.

[0045] As for the "first", "second", etc. used in this paper, it is not particularly intended to indicate the order or sequence, nor is it intended to limit the case, but only to distinguish the components or operations described by the same technical terms.

[0046] As for the "connection" or "positioning" used in this paper, it can mean that two or more components or devices directly contact each other or indirectly contact each other, or it can mean that two or more components or devices operate or act on each other.

[0047] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or the like are open-ended terms that are intended to mean including, but not limited to.

[0048] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or the like are open-ended terms that are intended to mean including, but not limited to.

[0049] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or the like are open-ended terms that are intended to mean including, but not limited to.

[0050] The working principle and advantages of the present application are as follows: The present application can realize the adjustment of the transverse section and the connecting section at any position through the cooperation of the limiting member and the hinged first shaft sleeve and second shaft sleeve. Specifically, in the unfolded state, the transverse section and the connecting section are at a set angle, at which time the limiting member limits the rotation of the first shaft sleeve and the second shaft sleeve, so that the transverse section and the connecting section maintain a state of being at a set angle. In this way, the trolley can be normally used, but once the packaging operation is needed, the folding state is entered, at which time, through the action of external force, the rotation limitation of the limiting member on the first shaft sleeve and the second shaft sleeve is removed, and the transverse section is pushed to rotate around the hinge point to be parallel to the connecting section, so that the folding is completed.

[0051] Unlike the rigidly fixed transverse section and connecting section in the prior art, the transverse section in the present application can be at any angle and maintain the state, so that the operator can self-select and adjust the angle between the transverse section and the connecting section to adapt to different use scenarios and also reduce the difficulty of packaging. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a structural schematic diagram of a trolley in an embodiment of the present application; Figure 1 Figure 1 is a structural schematic diagram of a trolley in an embodiment of the present application; Figure 2 is a structural schematic diagram of the connecting section and the transverse section in an unfolded state in an embodiment of the present application; Figure 2 Figure 2 is a structural schematic diagram of the connecting section and the transverse section in an unfolded state in an embodiment of the present application; Figure 3 is a structural schematic diagram of the connecting section and the transverse section in a folded state in an embodiment of the present application; Figure 3 Figure 3 is a structural schematic diagram of the connecting section and the transverse section in a folded state in an embodiment of the present application; Figure 4 is a structural schematic diagram of a first shaft sleeve and a second shaft sleeve in an embodiment of the present application; Figure 4 Figure 4 is a structural schematic diagram of a first shaft sleeve and a second shaft sleeve in an embodiment of the present application; Figure 5 is a longitudinal sectional view of a first shaft sleeve and a second shaft sleeve in an embodiment of the present application; Figure 5 Figure 5 is a longitudinal sectional view of a first shaft sleeve and a second shaft sleeve in an embodiment of the present application; Figure 5 is a longitudinal sectional view of a first shaft sleeve and a second shaft sleeve in an embodiment of the present application; Figure 6This is a schematic diagram of the first card slot structure in an embodiment of the present invention; Appendix Figure 7 This is a schematic diagram of the second card slot structure in an embodiment of the present invention; Appendix Figure 8 This is a schematic diagram of the structure of the sliding block mounted on the sliding block in an embodiment of the present invention (the first bushing is hidden in the figure). Appendix Figure 9 This is a schematic diagram of the sliding block structure in an embodiment of the present invention; Appendix Figure 10 This is a schematic diagram of the structure when the protrusion is simultaneously located in the receiving slot and the limiting slot in an embodiment of the present invention; Appendix Figure 11 This is a schematic diagram of the structure as the protrusion gradually enters the receiving slot in an embodiment of the present invention.

[0053] In the above attached diagrams: 1. Frame; 2. Load-bearing plate; 3. Handrail; 4. Connecting section; 5. Lateral section; 6. First bushing; 7. Second bushing; 8. Through hole; 9. Limiting component; 10. Bolt; 11. First slot; 12. Second slot; 13. Sliding block; 14. Protrusion; 15. Positioning slot; 16. Receiving slot; 17. Limiting slot; 18. Elastic component; 19. Mounting slot; 20. Pushing component; 21. Insertion end; 22. Gear position. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0055] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0056] See appendix Figures 1-11As shown, a folding structure of a handcart handle, the handcart comprises a vertically arranged frame 1 and a bearing plate 2 rotatably arranged at the bottom end of the frame 1, and the frame 1 is provided with a handle 3; the handle 3 comprises two connecting segments 4 and a transverse segment 5, the transverse segment 5 is in a U shape, the two connecting segments 4 are symmetrically arranged and positioned and connected at the side of the frame 1, each connecting segment 4 is arranged along the length direction of the frame 1, and the two ends of the transverse segment 5 are connected with the upper ends of the two connecting segments 4 through folding structures respectively; the folding structure comprises a first shaft sleeve 6 and a second shaft sleeve 7, the end of the first shaft sleeve 6 is hinged with the end of the second shaft sleeve 7, the other end of the first shaft sleeve 6 is hinged with the other end of the second shaft sleeve 7, of the two, one is positioned and connected with the end of the connecting segment 4, and the other is positioned and connected with the end of the transverse segment 5, so that the connecting segment 4 and the transverse segment 5 form an unfolded state and a folded state; the hinge point of the first shaft sleeve 6 and the second shaft sleeve 7 is provided with a limiting piece 9, the limiting piece 9 acts on the first shaft sleeve 6 and / or the second shaft sleeve 7 to limit the relative rotation of the first shaft sleeve 6 and the second shaft sleeve 7; in the unfolded state, the transverse segment 5 and the connecting segment 4 form a set angle, the limiting piece 9 is configured to limit the rotation of the first shaft sleeve 6 and the second shaft sleeve 7, so that the transverse segment 5 and the connecting segment 4 maintain a state of forming a set angle; in order to enter the folded state, through external force, the rotation limitation of the limiting piece 9 on the first shaft sleeve 6 and the second shaft sleeve 7 is removed, and the transverse segment 5 is pushed to rotate around the hinge point to realize the folding of the transverse segment 5 and the connecting segment 4.

[0057] In this embodiment, the handle 3 can drive the transverse segment 5 to rotate around the hinge point of the first shaft sleeve 6 and the second shaft sleeve 7 during use, and in the process of rotation, the first shaft sleeve 6 and the second shaft sleeve 7 can be positioned to a set angle, for example, 60 degrees, 120 degrees or parallel to the connecting segment 4, by the limiting piece 9.

[0058] The reason why the transverse segment 5 needs to be inclined is that it is convenient for the operator to apply force to the handcart.

[0059] The present application can realize the adjustment of the transverse segment 5 and the connecting segment 4 at any position through the cooperation of the limiting piece 9 and the hinged first shaft sleeve 6 and second shaft sleeve 7, specifically, in the unfolded state, the transverse segment 5 and the connecting segment 4 form a set angle, at this time the limiting piece 9 limits the rotation of the first shaft sleeve 6 and the second shaft sleeve 7, so that the transverse segment 5 and the connecting segment 4 maintain a state of forming a set angle, so that the handcart can be used normally, but once the packaging operation is needed, the folded state is needed, at this time, through external force, the rotation limitation of the limiting piece 9 on the first shaft sleeve 6 and the second shaft sleeve 7 is removed, and the transverse segment 5 is pushed to rotate around the hinge point to be parallel to the connecting segment 4, that is, the folding is completed.

[0060] Different from the rigid fixed transverse section 5 and the connecting section 4 in the prior art, the transverse section 5 in the application can be at any angle and maintain the state, so that the operator can self-select and adjust the angle between the transverse section 5 and the connecting section 4 to adapt to different use scenarios while greatly reducing the difficulty of packaging.

[0061] Preferably, the hinge point of the first shaft sleeve 6 and the second shaft sleeve 7 is provided with a through hole 8, and the first shaft sleeve 6 and the second shaft sleeve 7 are hinged by a bolt 10, which is arranged in the through hole 8 and coaxially arranged with the through hole 8; the bolt 10 is provided with a limiting piece 9, which acts on the first shaft sleeve 6 and / or the second shaft sleeve 7 to limit the rotation of the first shaft sleeve 6 and the second shaft sleeve 7.

[0062] In the embodiment, the hinge mode of the first shaft sleeve 6 and the second shaft sleeve 7 is that 1, the hinge is achieved by the bolt 10, 2, the same position of the opposite ends of the first shaft sleeve 6 and the second shaft sleeve 7 is provided with a hole, and a hollow I-shaped clamping column is arranged in the hole, and the I-shaped head of the hollow I-shaped clamping column clamps the first shaft sleeve 6 and the second shaft sleeve 7, so that the two are hinged.

[0063] In the embodiment, the limiting piece 9 is configured to limit the rotation of the first shaft sleeve 6 and the second shaft sleeve 7, specifically, 1, the limiting piece 9 can be a nut arranged at both ends of the bolt 10, and rotating the nut can clamp the hinge end of the first shaft sleeve 6 and the second shaft sleeve 7 to achieve limiting (at this time, the bolt 10 is exposed at both ends); 2. The limiting piece 9 can be a bolt arranged inside the hollow I-shaped clamping column, and a nut is arranged outside the bolt, and by rotating the nut, the nut is pressed towards the first shaft sleeve 6 and the second shaft sleeve 7 to achieve limiting.

[0064] The above is several embodiments of the limiting piece 9 limiting the rotation of the first shaft sleeve 6 and the second shaft sleeve 7 in the application.

[0065] Based on the above design, the first shaft sleeve 6 and the second shaft sleeve 7 can normally realize the hinge operation.

[0066] At the same time, different from the above-mentioned hollow I-shaped clamping column, the setting of the bolt 10 has higher connection strength.

[0067] Preferably, the hinge end side of the first shaft sleeve 6 is concave inwardly provided with a first clamping groove 11; the hinge end side of the second shaft sleeve 7 is concave inwardly provided with a second clamping groove 12, and the slot of the first clamping groove 11 is arranged towards the slot of the second clamping groove 12; when the first shaft sleeve 6 and the second shaft sleeve 7 are hinged, the first clamping groove 11 and the second clamping groove 12 are aligned with each other and constitute an annular groove structure, the through hole 8 is coaxially arranged with the first clamping groove 11 and the second clamping groove 12; the limiting piece 9 is arranged in the annular groove structure and is sleeved on the outer side wall of the bolt 10, and the limiting piece 9 is configured to slide along the axis of the bolt 10.

[0068] With the above design, the limiting member 9 can be hidden in the annular groove structure to prevent external impact on the limiting member 9, thereby preventing the limiting member 9 from being damaged.

[0069] Preferably, the limiting member 9 comprises a sliding block 13 which is sleeved on the outer wall of the bolt 10 and coaxially arranged with the bolt 10, and the sliding block 13 is arranged in the annular groove structure; the sliding block 13 is configured to reciprocate only along the axial direction of the bolt 10; the outer circumferential side of the sliding block 13 is provided with a plurality of protrusions 14 which protrude radially, and all the protrusions 14 are uniformly distributed around the axis of the sliding block 13; the annular groove structure is provided with a plurality of clamping grooves 15, each clamping groove 15 is one-to-one matched with each protrusion 14; the rotation movement of the first shaft sleeve 6 and / or the second shaft sleeve 7 relative to the bolt 10 is constrained by the cooperation of the protrusions 14 and the clamping grooves 15.

[0070] With the above design, the first shaft sleeve 6 and / or the second shaft sleeve 7 can be quickly and simply constrained in the annular groove structure.

[0071] The technical solution of the limiting member 9 limiting the first shaft sleeve 6 or the second shaft sleeve 7 alone can be illustrated by limiting the first shaft sleeve 6 as an example, and the principle of limiting the second shaft sleeve 7 is the same. Specifically, the bolt 10 is fixedly arranged with the second shaft sleeve 7, and the fixing mode can adopt clamping block restriction, glue bonding, interference fit, threaded fixing, etc. That is, the second shaft sleeve 7 cannot rotate around the bolt 10, but only the second shaft sleeve 7 can rotate with the bolt 10. In this way, it is only necessary to limit the first shaft sleeve 6 alone.

[0072] At this time, the clamping grooves 15 are arranged on the first shaft sleeve 6, and since the sliding block 13 is configured to reciprocate only along the axial direction of the bolt 10, the first shaft sleeve 6 can be limited by inserting the protrusions 14 into the clamping grooves 15.

[0073] Preferably, the clamping grooves 15 comprise a plurality of accommodating grooves 16 and a plurality of limiting grooves 17; each accommodating groove 16 and each limiting groove 17 are arranged along the axial direction of the sliding block 13; wherein the accommodating grooves 16 are formed by the inner side wall of the second clamping groove 12 being concave; the limiting grooves 17 are formed by the inner side wall of the first clamping groove 11 being concave; when the protrusions 14 and the clamping grooves 15 are matched, each accommodating groove 16 and each limiting groove 17 are aligned with each other, and the protrusions 14 are simultaneously located in the aligned accommodating grooves 16 and limiting grooves 17 to constrain the relative rotation of the first shaft sleeve 6 and the second shaft sleeve 7.

[0074] With the above design, the limiting member 9 can limit the first shaft sleeve 6 and the second shaft sleeve 7 at the same time. Unlike the scheme of limiting them separately, the scheme of limiting them simultaneously has lower requirements for the bolt 10 and the penetrating hole 8, and only needs to be able to accommodate and guide the bolt 10 to pass through.

[0075] Specifically, in the unfolded state, the transverse section 5 and the connecting section 4 are at a set angle, at this time, each accommodating slot 16 is aligned with each limiting slot 17, and the protruding part 14 is simultaneously in the aligned accommodating slot 16 and limiting slot 17 to constrain the relative rotation of the first shaft sleeve 6 and the second shaft sleeve 7, so that once the first shaft sleeve 6 or the second shaft sleeve 7 is forced, a rotating tendency is generated, and since the protruding part 14 simultaneously abuts against the inner wall of the accommodating slot 16 and the limiting slot 17, the purpose of simultaneously limiting the first shaft sleeve 6 and the second shaft sleeve 7 is achieved.

[0076] Once it is needed to guide the transverse section 5 and the connecting section 4 into the folded state, the protruding part 14 is driven into the accommodating slot 16 to enable the relative rotation of the transverse section 5 and the connecting section 4.

[0077] Preferably, the slot depth of the accommodating slot 16 is greater than or equal to the height of the protruding part 14; and the slot depth of the limiting slot 17 is less than the height of the protruding part 14.

[0078] With the above design, after the protruding part 14 enters the accommodating slot 16, it will not contact the limiting slot 17, preventing the phenomenon that the protruding part 14 contacts the limiting slot 17 when guiding the transverse section 5 and the connecting section 4 into the folded state, which causes the transverse section 5 and the connecting section 4 to fail to normally rotate.

[0079] Meanwhile, the slot depth of the limiting slot 17 being less than the height of the protruding part 14 can ensure that when the protruding part 14 completely enters the limiting slot 17, it is still clamped in the accommodating slot 16, so that the transverse section 5 and the connecting section 4 maintain the set angle.

[0080] Preferably, the limiting part 9 further comprises a resilient part 18, which is sleeved on the outer peripheral sidewall of the bolt 10, and the resilient part 18 acts on the sliding block 13 to enable the sliding block 13 and the protruding part 14 to have a tendency to always slide from the accommodating slot 16 to the limiting slot 17; through external force, the elastic force of the resilient part 18 is overcome to enable the sliding block 13 to pull the protruding part 14 to completely enter the accommodating slot 16.

[0081] With the above design, the protruding part 14 can freely move along the axis of the bolt 10 without manually adjusting the position of the protruding part 14.

[0082] In the case of guiding the transverse section 5 and the connecting section 4 to maintain the set angle, the resilient part 18 (spring) is in an initial state of being stretched, at this time, the resilient part 18 will push the sliding block 13 to the bottom of the first slot 11 (that is, the bottom of the limiting slot 17, which can be specifically referred to Figure 5 、 Figure 10 and Figure 11), at this time, the protruding part 14 will completely enter the limiting slot 17, but since the slot depth of the limiting slot 17 is less than the height of the protruding part 14, the protruding part 14 is still partially clamped in the accommodating slot 16, so that the transverse section 5 and the connecting section 4 maintain a set angle.

[0083] Once the transverse section 5 and the connecting section 4 need to enter the folded state, force is applied to the sliding block 13, which will slide along the bolt 10 and compress the elastic member 18, at the same time, the sliding block 13 will pull the protruding part 14 to completely enter the accommodating slot 16, and then the relative rotation of the transverse section 5 and the connecting section 4 can be realized.

[0084] Subsequently, once the force applied to the sliding block 13 is removed, the elastic member 18 resets, and the sliding block 13 and the protruding part 14 slide from the accommodating slot 16 to the limiting slot 17.

[0085] The movement of the sliding block 13 can be achieved by pressing the push column from the outside.

[0086] Preferably, the surface of the first shaft sleeve 6 at the hinge end and opposite the first slot 11 is concave and provided with a mounting slot 19; the mounting slot 19 is coaxially arranged with the penetrating hole 8; the limiting member 9 further comprises a push member 20 arranged in the mounting slot 19; the push member 20 is movably connected in the mounting slot 19 and coaxially arranged with the mounting slot 19; the push member 20 has a penetrating end 21 passing through the bottom of the mounting slot 19 and abutting against the surface of the sliding block 13; the penetrating end 21 is configured to push the sliding block 13 to slide along the outer circumferential side of the bolt 10.

[0087] Preferably, the end of the penetrating end 21 is provided with a stop part 22 to limit the sliding of the penetrating end 21 out of the mounting slot 19.

[0088] With the above design, the operator can realize the movement of the sliding block 13 through the push member 20.

[0089] Specifically, if the transverse section 5 and the connecting section 4 need to enter the folded state, the push member 20 is directly pressed to make the push member 20 enter the mounting slot 19, and in this process, the penetrating end 21 pushes the sliding block 13 to slide along the outer side of the bolt 10.

[0090] Once the pressing force applied to the push member 20 is removed, the elastic member 18 resets, and the sliding block 13 and the protruding part 14 slide from the accommodating slot 16 to the limiting slot 17; due to the existence of the stop part 22, the penetrating end 21 will not slide out of the mounting slot 19, but will always maintain the state of abutting against the surface of the sliding block 13.

[0091] It should be noted that the transverse section 5 and the connecting section 4 are connected with the first shaft sleeve 6 and the second shaft sleeve 7 respectively, so that the relative rotation of the transverse section 5 and the connecting section 4 is the relative rotation of the first shaft sleeve 6 and the second shaft sleeve 7.

[0092] The surface of the sliding block 13 is provided with a lower groove for accommodating the stop portion 22, which can accommodate the stop portion 22 so that the elastic member 18 can completely push the protruding portion 14 on the sliding block 13 into the limiting slot 17, as shown in Figure 5 At this time, the upper surface of the sliding block 13 is in contact with the groove bottom of the first slot 11, so the lower groove is needed to accommodate the stop portion 22.

[0093] Working principle: The whole is divided into an unfolded state and a folded state, which are described separately as follows: In the unfolded state, the transverse section 5 and the connecting section 4 form a set angle, at this time, each accommodating slot 16 and each limiting slot 17 are aligned with each other, and the protruding portion 14 is simultaneously in the aligned accommodating slot 16 and limiting slot 17 to constrain the relative rotation of the first shaft sleeve 6 and the second shaft sleeve 7, so that once the first shaft sleeve 6 or the second shaft sleeve 7 is stressed, a rotating trend is generated, since the protruding portion 14 simultaneously abuts against the inner wall of the accommodating slot 16 and the limiting slot 17, thus achieving the purpose of simultaneously limiting the first shaft sleeve 6 and the second shaft sleeve 7.

[0094] After that, if it is needed to guide the transverse section 5 and the connecting section 4 into the folded state, the pushing member 20 is directly pressed to make the pushing member 20 enter the installation groove 19, in this process, the penetrating end 21 pushes the sliding block 13 to slide along the outer peripheral side of the bolt 10, and the sliding block 13 will compress the elastic member 18 when sliding along the bolt 10, and store energy, at the same time, the sliding block 13 will pull the protruding portion 14 to completely enter the accommodating slot 16, then the relative rotation of the transverse section 5 and the connecting section 4 can be realized.

[0095] Once the pressing force on the pushing member 20 is no longer applied, the elastic member 18 resets to make the sliding block 13 and the protruding portion 14 slide from the accommodating slot 16 to the limiting slot 17, due to the existence of the stop portion 22, the penetrating end 21 will not slide out of the installation groove 19, but will always remain in abutment with the surface of the sliding block 13.

[0096] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A folding arm structure for a trolley, characterised in that: The trolley comprises a vertically arranged trolley frame (1) and a load bearing plate (2) rotatably arranged at the bottom end of the trolley frame (1), and a handrail (3) is arranged on the trolley frame (1); The handrail (3) comprises two connecting sections (4) and a transverse section (5), the transverse section (5) is in a U shape, the two connecting sections (4) are symmetrically arranged and are positioned and connected to the side portions of the trolley frame (1), each connecting section (4) is arranged along the length direction of the trolley frame (1), and the two ends of the transverse section (5) are connected to the upper ends of the two connecting sections (4) through folding structures, respectively; The folding structure comprises a first shaft sleeve (6) and a second shaft sleeve (7), the end portion of the first shaft sleeve (6) is hingedly connected to the end portion of the second shaft sleeve (7), the other end of the first shaft sleeve (6) is hingedly connected to the other end of the second shaft sleeve (7), of the two, one is positioned and connected to the end portion of the connecting section (4), and the other is positioned and connected to the end portion of the transverse section (5), so that the connecting section (4) and the transverse section (5) form an unfolded state and a folded state; The hinge joint of the first shaft sleeve (6) and the second shaft sleeve (7) is provided with a limiting member (9), the limiting member (9) acts on the first shaft sleeve (6) and / or the second shaft sleeve (7) to limit the relative rotation of the first shaft sleeve (6) and the second shaft sleeve (7); In the unfolded state, the transverse section (5) and the connecting section (4) are at a set angle, the limiting member (9) is configured to limit the rotation of the first shaft sleeve (6) and the second shaft sleeve (7) so that the transverse section (5) and the connecting section (4) maintain a state at a set angle; In order to enter the folded state, through the action of an external force, the rotation limitation of the limiting member (9) on the first shaft sleeve (6) and the second shaft sleeve (7) is removed, the transverse section (5) is pushed to rotate around the hinge joint to realize the folding of the transverse section (5) and the connecting section (4).

2. A folding structure for a handle of a trolley according to claim 1, characterised in that: The hinge joint of the first shaft sleeve (6) and the second shaft sleeve (7) is provided with a through hole (8), and the first shaft sleeve (6) and the second shaft sleeve (7) are hingedly connected through a bolt (10), the bolt (10) is arranged in the through hole (8) and coaxially arranged with the through hole (8); The bolt (10) is provided with a limiting member (9), the limiting member (9) acts on the first shaft sleeve (6) and / or the second shaft sleeve (7) to limit the rotation of the first shaft sleeve (6) and the second shaft sleeve (7).

3. A folding structure for a handle of a trolley according to claim 2, wherein: The hinge joint side of the first shaft sleeve (6) is concave inwardly provided with a first clamping groove (11); The hinge joint side of the second shaft sleeve (7) is concave inwardly provided with a second clamping groove (12), the slot of the first clamping groove (11) is arranged towards the slot of the second clamping groove (12); when the first shaft sleeve (6) and the second shaft sleeve (7) are hingedly connected, the first clamping groove (11) and the second clamping groove (12) are aligned with each other and form an annular groove structure, the through hole (8) is coaxially arranged with the first clamping groove (11) and the second clamping groove (12); The limiting member (9) is arranged in the annular groove structure and is sleeved on the outer side wall of the bolt (10), and the limiting member (9) is configured to slide along the axis of the bolt (10).

4. A folding hand of a trolley according to claim 3, characterised in that: The limiting member (9) comprises a sliding block (13) which is slidingly sleeved on the outer side wall of the bolt (10) and coaxially arranged with the bolt (10), and the sliding block (13) is arranged in the annular groove structure; The sliding block (13) is configured to reciprocate only along the axis direction of the bolt (10); The outer circumferential side of the sliding block (13) is provided with a plurality of protrusions (14) protruding radially, and all the protrusions (14) are uniformly distributed around the axis of the sliding block (13); The annular groove structure is provided with a plurality of clamping grooves (15), and each clamping groove (15) is one-to-one matched with each protrusion (14); Through the cooperation of the protrusions (14) and the clamping grooves (15), the rotational movement of the first shaft sleeve (6) and / or the second shaft sleeve (7) relative to the bolt (10) is constrained.

5. A folding hand of a trolley according to claim 4, characterised in that: The clamping groove (15) includes a plurality of accommodating clamping grooves (16) and a plurality of limiting clamping grooves (17); Each accommodating clamping groove (16) and each limiting clamping groove (17) are arranged along the axis direction of the sliding block (13); The accommodating clamping groove (16) is formed by the inner recess of the inner side wall of the second clamping groove (12); The limiting clamping groove (17) is formed by the inner recess of the inner side wall of the first clamping groove (11); When the protrusion (14) and the clamping groove (15) are matched, each accommodating clamping groove (16) and each limiting clamping groove (17) are aligned with each other, and the protrusion (14) is simultaneously located in the aligned accommodating clamping groove (16) and limiting clamping groove (17) to constrain the relative rotation of the first shaft sleeve (6) and the second shaft sleeve (7).

6. A folding hand of a trolley according to claim 5, characterised in that: The depth of the accommodating clamping groove (16) is greater than or equal to the height of the protrusion (14); The depth of the limiting clamping groove (17) is less than the height of the protrusion (14).

7. A folding hand of a trolley according to claim 5 or 6, characterised in that: The limiting member (9) further includes a resilient member (18) which is sleeved on the outer circumferential side wall of the bolt (10), and the resilient member (18) acts on the sliding block (13) to make the sliding block (13) and the protrusion (14) have a tendency to slide from the accommodating clamping groove (16) to the limiting clamping groove (17) at all times; Through the action of external force, the elastic force of the resilient member (18) is overcome, so that the sliding block (13) pulls the protrusion (14) to completely enter the accommodating clamping groove (16).

8. The folding handrail structure for a stroller of claim 4, wherein: The surface of the hinged end of the first shaft sleeve (6) and opposite to the first clamping groove (11) is recessed and provided with a mounting groove (19); The mounting groove (19) is coaxially arranged with the penetrating hole (8); The limiting member (9) further includes a pushing member (20) arranged in the mounting groove (19), the pushing member (20) is movably connected in the mounting groove (19) and coaxially arranged with the mounting groove (19), and the pushing member (20) has a penetrating end (21) penetrating the groove bottom of the mounting groove (19) and abutting against the surface of the sliding block (13), and the penetrating end (21) is configured to push the sliding block (13) to slide along the outer circumferential side of the bolt (10).

9. A folding hand of a trolley according to claim 8, characterised in that: The end of the penetrating end (21) is provided with a blocking portion (22) to limit the sliding out of the mounting groove (19).

Images