A folding structure for the handle of a trolley

Abstract

The utility model discloses a handrail folding structure of small trolley, and the small trolley comprises a vertically arranged frame, a bearing plate rotatably arranged at the bottom end of the frame and a handrail arranged on the frame, wherein the handrail comprises two connecting sections and a horizontal section, the horizontal section is in the shape of U, the two connecting sections are symmetrically arranged and positioned and connected to the side of the frame, and the horizontal section and the connecting section in the utility model can be at any angle and maintain the state, so that the operator can select and adjust the angle between the horizontal section and the connecting section to adapt to different use scenarios and reduce the difficulty of packaging.

Description

Technical Field

[0001] This utility model relates to the field of trolley technology, specifically to a folding handle structure for a trolley. Background Technology

[0002] Folding trolleys, as a lightweight and flexible means of transportation, are playing an increasingly important role in modern urban life, warehousing and logistics, moving, shopping, and camping. Their core advantage lies in their foldability, significantly reducing their size when not in use or during transport. They are easy to store in vehicle trunks, elevator corners, or narrow spaces at home, lowering storage and carrying costs and enhancing ease of use. Intense market competition and ever-increasing user demands for portability, functionality, and ease of use are driving manufacturers to continuously optimize and innovate folding structures.

[0003] Despite the increasing sophistication of overall folding designs, mainstream folding strollers on the market currently suffer from significant drawbacks in their exposed handles: the structure is simple and rigidly fixed, preventing folding. These protruding handles are typically fixed-length metal tubes, forming the main bottleneck to reducing the stroller's size when folded. This directly leads to several pain points: Rising transportation and warehousing costs: Even when folded, the exposed long handlebars prevent further reduction in packaging size, especially since some handlebar ends consist of vertical and horizontal sections. When folded, the vertical section is parallel to the cart frame, but the horizontal section protrudes, increasing the packaging volume per cart and the space occupied during logistics (especially e-commerce transportation), thus driving up the unit cost.

[0004] Limited application scenarios: In narrow elevators, crowded carriages, and compact lockers, protruding handrails are prone to bumping, snagging, or even obstructing passage, reducing the product's applicability and safety.

[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0006] This utility model provides a folding handle structure for a trolley, which aims to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model 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, the frame being provided with a handle; 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 connecting section. One end is positioned and connected, and the other end 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] In the above solution, unlike the rigid and fixed horizontal and connecting segments in the prior art, the horizontal segment in this application can be at any angle and maintain this state, so that the operator can choose and adjust the angle between the horizontal segment and the connecting segment to adapt to different usage scenarios and reduce the difficulty of packaging.

[0013] A further technical solution is provided with a through hole at the hinge point between the first bushing and the second bushing, and the first bushing and the second bushing are hinged by a bolt, which is set in the through hole and coaxially arranged with the through hole. The bolt is equipped with a limiting element that acts on the first bushing and / or the second bushing to restrict the rotation of the first bushing and the second bushing.

[0014] In this embodiment, the hinge connection between the first bushing and the second bushing is: 1. Hinged by bolts; 2. Holes are provided at the same position on opposite ends of the first bushing and the second bushing, and an I-shaped hollow retaining post is provided in the hole. The first bushing and the second bushing are hinged by the I-shaped head of the I-shaped hollow retaining post.

[0015] In this embodiment, the limiting member is configured to limit the rotation of the first bushing and the second bushing. Specifically, 1. the limiting member can be a nut set at both ends of the bolt. The limiting position can be achieved by rotating the nut to clamp the hinge end of the first bushing and the second bushing. 2. The limiting component can be a bolt installed inside the hollow I-shaped retaining post, with a nut fitted on the outside of the bolt. By rotating the nut, the nut is pressed against the first and second bushings, thereby achieving the limiting function.

[0016] The above are several embodiments of the limiting element restricting the rotation of the first bushing and the second bushing in this application.

[0017] Based on the above design, the first bushing and the second bushing can achieve better hinge operation.

[0018] Unlike the aforementioned hollow I-shaped locking post, the bolts provide a stronger connection (the bolts are not exposed in this application, reducing the chance of impact).

[0019] A further technical solution is provided where a first groove is recessed on the hinge end side of the first bushing; a second groove is recessed on the hinge end side of the second bushing, with the opening of the first groove facing the opening of the second groove; when the first bushing and the second bushing are hinged, the first groove and the second groove are aligned with each other and form an annular groove structure, and the through hole is coaxially arranged with the first groove and the second groove; a limiting member is disposed within the annular groove structure and sleeved on the outer wall of the bolt, and the limiting member is configured to slide along the bolt axis.

[0020] The above design allows the limiting component to be hidden within the annular groove structure, preventing external impacts that could damage it.

[0021] A further technical solution includes a sliding block that is slidably sleeved on the outer wall of the bolt and coaxially arranged with the bolt, the sliding block being disposed within an annular groove structure; the sliding block is configured to reciprocate only along the bolt axis; the outer periphery of the sliding block has multiple protrusions that bulge radially, all of which are evenly distributed around the axis of the sliding block; the annular groove structure has multiple locking grooves, each locking groove corresponding to each protrusion; the engagement of the protrusions with the locking grooves constrains the rotational movement of the first bushing and / or the second bushing relative to the bolt.

[0022] With the above design, the first bushing and / or the second bushing can be constrained quickly and easily within the annular groove structure.

[0023] The technical solution for individually restricting the first or second bushing can be illustrated using the example of restricting the first bushing. Restricting the second bushing follows the same principle. Specifically, the bolt and the second bushing are fixedly connected. The fixing method can be a clamp, adhesive bonding, interference fit, or threaded fixation, etc. That is, the second bushing cannot rotate around the bolt; it can only rotate with the bolt. In this case, only the first bushing needs to be restricted.

[0024] At this time, the locking groove is set on the first bushing. Since the sliding block is configured to reciprocate only along the bolt axis, the first bushing can be restricted by inserting the protrusion into the locking groove.

[0025] A further technical solution includes a locking groove comprising multiple receiving slots and multiple limiting slots; each receiving slot and each limiting slot is arranged along the axial direction of the sliding block; wherein, the receiving slot is formed by the inner wall of the second slot being recessed; the limiting slot is formed by the inner wall of the first slot being recessed; when the protrusion engages with the locking groove, each receiving slot and each limiting slot are aligned with each other, and the protrusion is simultaneously located within the aligned receiving slot and limiting slot, thereby constraining the relative rotation of the first bushing and the second bushing.

[0026] The above design allows the limiting component to simultaneously constrain both the first and second bushings. Unlike individual constraints, this method of simultaneously constraining both bushings requires less stringent bolt requirements and less demanding drilling requirements; it only needs to accommodate and guide the bolt through.

[0027] Specifically, in the unfolded state, the transverse section and the connecting section are at a set angle. At this time, each receiving slot and each limiting slot are aligned with each other, and the protrusion is simultaneously in the aligned receiving slot and limiting slot so that the relative rotation of the first bushing and the second bushing is constrained. In this way, once the first bushing or the second bushing is subjected to force, a rotational tendency is generated. Since the protrusion simultaneously abuts against the inner wall of the receiving slot and the limiting slot, the purpose of simultaneously restricting the first bushing and the second bushing is achieved.

[0028] Once it is necessary to guide the transverse section and connecting section into a folded state, the drive protrusion enters the receiving slot, which allows the transverse section and connecting section to rotate relative to each other.

[0029] A further technical solution is that the depth of the receiving slot is greater than or equal to the height of the protrusion; the depth of the limiting slot is less than the height of the protrusion.

[0030] With the above design, the protrusion will not contact the limiting slot after entering the receiving slot, thus preventing the phenomenon that the protrusion will contact the limiting slot when guiding the transverse section and the connecting section into the folded state, which would prevent the transverse section and the connecting section from rotating normally.

[0031] Meanwhile, the depth of the limiting groove is less than the height of the protrusion, which ensures that when the protrusion is fully inserted into the limiting groove, part of it is still stuck in the receiving groove, thereby maintaining the set angle between the transverse section and the connecting section.

[0032] In a further technical solution, the limiting component also includes an elastic element, which is sleeved on the outer peripheral sidewall of the bolt. The elastic element acts on the sliding block so that the sliding block and the protrusion have a tendency to slide from the receiving groove to the limiting groove. By the action of external force, the elastic force of the elastic element is overcome so that the sliding block pulls the protrusion completely into the receiving groove.

[0033] The above design allows the protrusion to move freely along the bolt axis without requiring manual repositioning.

[0034] When the guide lateral segment and connecting segment maintain a set angle, the elastic element (spring) is in the initial open state. At this time, the elastic element will push the sliding block to the bottom of the first slot. At this time, the protrusion will completely enter the limiting slot. However, since the depth of the limiting slot is less than the height of the protrusion, part of the protrusion is still stuck in the receiving slot, thus maintaining the set angle between the lateral segment and connecting segment.

[0035] Once the transverse section and the connecting section need to be folded, force is applied to the sliding block, which will slide along the bolt and compress the elastic element. At the same time, the sliding block will pull the protrusion completely into the receiving slot, after which the transverse section and the connecting section can rotate relative to each other.

[0036] Subsequently, once the force on the sliding block is no longer applied, the elastic element resets, causing the sliding block and protrusion to slide from the receiving slot to the limiting slot.

[0037] The movement of the sliding block can be achieved by pressing it with an externally inserted push column.

[0038] A further technical solution is provided where the hinge end of the first bushing and the surface opposite to the first slot are recessed with an installation groove; the installation groove and the through hole are coaxially arranged; the limiting member also includes a pusher disposed in the installation groove, the pusher is movably connected in the installation groove and coaxially arranged with the installation groove, the pusher has an insertion end that passes through the bottom of the installation groove and abuts against the surface of the sliding block, the insertion end is configured to push the sliding block to slide along the outer periphery of the bolt.

[0039] A further technical solution is to provide a stop at the end of the insertion end to prevent the insertion end from sliding out of the mounting groove.

[0040] The above design allows the operator to move the sliding block by pushing the component.

[0041] Specifically, if the transverse section and the connecting section need to be folded, press the pusher directly to make the pusher enter the mounting groove. During this process, the insert end pushes the sliding block to slide along the outer periphery of the bolt.

[0042] Once the pressing force on the pusher is no longer applied, the elastic element resets, causing the sliding block and protrusion to slide from the receiving slot to the limiting slot. Due to the presence of the stop, the insertion end will not slide out of the mounting slot, but will remain in contact with the surface of the sliding block.

[0043] It should be noted that the transverse section is connected to the first bushing and the connecting section is connected to the second bushing. Therefore, when the transverse section and the connecting section rotate relative to each other, the first bushing and the second bushing rotate relative to each other.

[0044] The surface of the sliding block is provided with a lower groove for accommodating the stop part. The lower groove can accommodate the stop part, so that the elastic element can push the protrusion on the sliding block completely into the limiting groove. In particular, when the upper surface of the sliding block is in contact with the bottom of the first groove, the lower groove is needed to accommodate the stop part.

[0045] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0046] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0047] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0048] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0049] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0050] The working principle and advantages of this utility model are as follows: This invention allows for the adjustment of the transverse section and connecting section at any position through the cooperation of the limiting member and the hinged first and second bushings. Specifically, in the unfolded state, the transverse section and connecting section are at a set angle. At this time, the limiting member restricts the rotation of the first and second bushings to maintain the transverse section and connecting section at the set angle, so that the trolley can be used normally. However, once packaging is required, it needs to be folded. At this time, by applying external force, the rotation restriction of the first and second bushings by the limiting member is released, and the transverse section is pushed to rotate around the hinge point until it is parallel to the connecting section, thus completing the folding.

[0051] Unlike the rigid and fixed transverse and connecting segments in the prior art, the transverse segment in this application can be at any angle and maintain this state, allowing the operator to select and adjust the angle between the transverse and connecting segments to adapt to different usage scenarios while also reducing the difficulty of packaging. Attached Figure Description

[0052] Appendix Figure 1 This is a schematic diagram of the trolley structure in an embodiment of the present utility model; Appendix Figure 2 This is a schematic diagram of the structure of the connecting segment and the transverse segment in the unfolded state in an embodiment of this utility model; Appendix Figure 3 This is a schematic diagram of the structure when the connecting segment and the transverse segment are in a folded state in an embodiment of this utility model; Appendix Figure 4 This is a schematic diagram of the first bushing and the second bushing structure in an embodiment of the present utility model; Appendix Figure 5 This is a longitudinal cross-sectional view of the first bushing and the second bushing in an embodiment of this utility model; Appendix Figure 6 This is a schematic diagram of the first card slot structure in an embodiment of the present utility model; Appendix Figure 7 This is a schematic diagram of the second card slot structure in an embodiment of the present utility model; 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 utility model (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 utility model; Appendix Figure 10 This is a schematic diagram of the structure when the protrusion in this embodiment of the present utility model is simultaneously located in the receiving slot and the limiting slot; Appendix Figure 11 This is a schematic diagram of the structure when the protrusion gradually enters the receiving slot in an embodiment of the present utility model.

[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 armrest structure for a trolley is disclosed. The trolley includes a vertically arranged frame 1 and a support plate 2 rotatably mounted at the bottom of the frame 1. An armrest 3 is provided on the frame 1. The armrest 3 includes two connecting sections 4 and a transverse section 5. The transverse section 5 is U-shaped. The two connecting sections 4 are symmetrically arranged and positioned on the side of the frame 1. Each connecting section 4 is arranged along the length of the frame 1. Both ends of the transverse section 5 are connected to the upper ends of the two connecting sections 4 respectively via a folding structure. The folding structure includes a first bushing 6 and a second bushing 7. The end of the first bushing 6 is hinged to the end of the second bushing 7, and the other end of the first bushing 6 is hinged to the other end of the second bushing 7. One of the two bushings is positioned connected to the end of the connecting section 4, and the other is positioned connected to the upper end of the transverse section 5. The end of segment 5 is positioned and connected so that connecting segment 4 and transverse segment 5 can be in an unfolded state and a folded state. A limiting member 9 is provided at the hinge point of the first bushing 6 and the second bushing 7. The limiting member 9 acts on the first bushing 6 and / or the second bushing 7 to limit the relative rotation of the first bushing 6 and the second bushing 7. In the unfolded state, the transverse segment 5 and the connecting segment 4 are at a set angle. The limiting member 9 is configured to limit the rotation of the first bushing 6 and the second bushing 7 so that the transverse segment 5 and the connecting segment 4 are maintained at the set angle. In order to enter the folded state, by applying an external force, the rotation restriction of the first bushing 6 and the second bushing 7 by the limiting member 9 is released, 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, when the handrail 3 is in use, the transverse segment 5 can be driven to rotate around the hinge point of the first bushing 6 and the second bushing 7. During the rotation, the first bushing 6 and the second bushing 7 can be positioned to a set angle by the limiting member 9, such as 60 degrees, 120 degrees, or the transverse segment 5 is parallel to the connecting segment 4.

[0058] The reason why the horizontal section 5 needs to be tilted is to make it easier for the operator to apply force to the trolley.

[0059] This invention allows for the adjustment of the transverse section 5 and the connecting section 4 at any position through the cooperation of the limiting member 9 with the hinged first bushing 6 and second bushing 7. Specifically, in the unfolded state, the transverse section 5 and the connecting section 4 are at a set angle. At this time, the limiting member 9 restricts the rotation of the first bushing 6 and the second bushing 7 so that the transverse section 5 and the connecting section 4 maintain the set angle, allowing the trolley to be used normally. However, once packaging is required, it needs to be folded. At this time, by applying external force, the rotation restriction of the first bushing 6 and the second bushing 7 by the limiting member 9 is released, pushing the transverse section 5 to rotate around the hinge point until it is parallel to the connecting section 4, thus completing the folding.

[0060] Unlike the rigidly fixed transverse segment 5 and connecting segment 4 in the prior art, the transverse segment 5 in this application can be at any angle and maintain this state, so that the operator can choose and adjust the angle between the transverse segment 5 and the connecting segment 4 to adapt to different usage scenarios and greatly reduce the difficulty of packaging.

[0061] Preferably, the hinge point between the first bushing 6 and the second bushing 7 is provided with a through hole 8, and the first bushing 6 and the second bushing 7 are hinged by a bolt 10, which is disposed in the through hole 8 and coaxially disposed with the through hole 8; the bolt 10 is provided with a limiting member 9, which acts on the first bushing 6 and / or the second bushing 7 to restrict the rotation of the first bushing 6 and the second bushing 7.

[0062] In this embodiment, the hinged connection between the first bushing 6 and the second bushing 7 is as follows: 1. Hinged connection by bolt 10; 2. Holes are provided at the same position on opposite ends of the first bushing 6 and the second bushing 7, and an I-shaped hollow locking post is provided in the hole. The first bushing 6 and the second bushing 7 are hinged by the head of the I-shaped hollow locking post.

[0063] In this embodiment, the limiting member 9 is configured to limit the rotation of the first bushing 6 and the second bushing 7. Specifically, 1. the limiting member 9 can be a nut provided at both ends of the bolt 10. The limiting position can be achieved by rotating the nut to clamp the hinge ends of the first bushing 6 and the second bushing 7 (at this time, both ends of the bolt 10 are exposed). 2. The limiting component 9 can be a bolt installed inside the hollow I-shaped locking post, with a nut sleeved on the outside of the bolt. By rotating the nut, the nut is pressed against the first bushing 6 and the second bushing 7, thereby achieving the limiting.

[0064] The above are several embodiments of the limiting element 9 restricting the rotation of the first bushing 6 and the second bushing 7 in this application.

[0065] Based on the above design, the first bushing 6 and the second bushing 7 can be hinged normally.

[0066] At the same time, unlike the I-shaped hollow retaining posts mentioned above, the bolt 10 provides a higher connection strength.

[0067] Preferably, the hinge end of the first bushing 6 is recessed with a first groove 11; the hinge end of the second bushing 7 is recessed with a second groove 12, and the opening of the first groove 11 faces the opening of the second groove 12; when the first bushing 6 and the second bushing 7 are hinged, the first groove 11 and the second groove 12 are aligned with each other and form an annular groove structure, and the through hole 8 is coaxially arranged with the first groove 11 and the second groove 12; the limiting member 9 is disposed in the annular groove structure and sleeved on the outer wall of the bolt 10, and the limiting member 9 is configured to slide along the axis of the bolt 10.

[0068] With the above design, the limiting member 9 can be hidden inside the annular groove structure to prevent external impacts on the limiting member 9, which could cause damage to the limiting member 9.

[0069] Preferably, the limiting member 9 includes a sliding block 13 that is slidably sleeved on the outer wall of the bolt 10 and coaxially arranged with the bolt 10. The sliding block 13 is disposed within the annular groove structure. The sliding block 13 is configured to reciprocate only along the axial direction of the bolt 10. A plurality of protrusions 14 are radially protruding from the outer periphery of the sliding block 13, and all protrusions 14 are evenly distributed around the axis of the sliding block 13. A plurality of locking grooves 15 are provided within the annular groove structure, and each locking groove 15 is matched with each protrusion 14 in a one-to-one correspondence. Through the cooperation between the protrusions 14 and the locking grooves 15, the rotational movement of the first bushing 6 and / or the second bushing 7 relative to the bolt 10 is constrained.

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

[0071] The technical solution for limiting either the first bushing 6 or the second bushing 7 separately using the limiting component 9 can be illustrated using the limiting component 9 as an example. The limiting of the first bushing 6 follows the same principle. Specifically, the bolt 10 and the second bushing 7 are fixedly connected. The fixing method can be a clamp, adhesive bonding, interference fit, or threaded fixing, etc. That is, the second bushing 7 cannot rotate around the bolt 10; it can only rotate with the bolt 10. In this way, only the first bushing 6 needs to be limited.

[0072] At this time, the locking groove 15 is set on the first bushing 6. Since the sliding block 13 is configured to reciprocate only along the axis of the bolt 10, the first bushing 6 can be restricted by inserting the protrusion 14 into the locking groove 15.

[0073] Preferably, the locking groove 15 includes a plurality of receiving grooves 16 and a plurality of limiting grooves 17; each receiving groove 16 and each limiting groove 17 is arranged along the axial direction of the sliding block 13; wherein, the receiving groove 16 is formed by the inner wall of the second groove 12 being recessed; the limiting groove 17 is formed by the inner wall of the first groove 11 being recessed; when the protrusion 14 is engaged with the locking groove 15, each receiving groove 16 and each limiting groove 17 are aligned with each other, and the protrusion 14 is simultaneously located in the aligned receiving groove 16 and limiting groove 17 so that the relative rotation of the first bushing 6 and the second bushing 7 is constrained.

[0074] With the above design, the limiting member 9 can simultaneously limit the first bushing 6 and the second bushing 7. Unlike limiting them separately, the scheme of limiting both at the same time has less requirement for the bolt 10 and less requirement for the machining of the through hole 8, as long as it can accommodate and guide the bolt 10 to pass through.

[0075] Specifically, in the unfolded state, the transverse segment 5 and the connecting segment 4 are at a set angle. At this time, each receiving slot 16 and each limiting slot 17 are aligned with each other, and the protrusion 14 is simultaneously located in the aligned receiving slot 16 and limiting slot 17 so that the relative rotation of the first bushing 6 and the second bushing 7 is constrained. In this way, once the first bushing 6 or the second bushing 7 is subjected to force, a rotational tendency is generated. Since the protrusion 14 simultaneously abuts against the inner wall of the receiving slot 16 and the limiting slot 17, the purpose of simultaneously restricting the first bushing 6 and the second bushing 7 is achieved.

[0076] Once it is necessary to guide the transverse segment 5 and the connecting segment 4 into a folded state, the drive protrusion 14 enters the receiving slot 16, which allows the transverse segment 5 and the connecting segment 4 to rotate relative to each other.

[0077] Preferably, the depth of the receiving slot 16 is greater than or equal to the height of the protrusion 14; the depth of the limiting slot 17 is less than the height of the protrusion 14.

[0078] With the above design, the protrusion 14 will not contact the limiting slot 17 after entering the receiving slot 16, thus preventing the phenomenon that the protrusion 14 will contact the limiting slot 17 when guiding the transverse section 5 and the connecting section 4 into the folded state, which would prevent the transverse section 5 and the connecting section 4 from rotating normally.

[0079] Meanwhile, the depth of the limiting groove 17 is less than the height of the protrusion 14, which ensures that when the protrusion 14 is fully inserted into the limiting groove 17, a part of it is still stuck in the receiving groove 16, thereby maintaining the set angle between the transverse section 5 and the connecting section 4.

[0080] Preferably, the limiting member 9 further includes an elastic member 18, which is sleeved on the outer peripheral sidewall of the bolt 10. The elastic member 18 acts on the sliding block 13 so that the sliding block 13 and the protrusion 14 have a tendency to slide from the receiving groove 16 to the limiting groove 17. By the action of external force, the elastic force of the elastic member 18 is overcome so that the sliding block 13 pulls the protrusion 14 completely into the receiving groove 16.

[0081] With the above design, the protrusion 14 can move freely along the axis of the bolt 10 without the need for manual adjustment of the position of the protrusion 14.

[0082] With the guide transverse segment 5 and connecting segment 4 maintaining a set angle, the elastic element 18 (spring) is in its initial open state. At this time, the elastic element 18 will push the sliding block 13 to the bottom of the first slot 11 (that is, the bottom of the limiting slot 17, see reference for details). Figure 5 , Figure 10 and Figure 11At this point, the protrusion 14 will be fully inserted into the limiting groove 17. However, since the depth of the limiting groove 17 is less than the height of the protrusion 14, part of the protrusion 14 is still stuck in the receiving groove 16, thereby maintaining the set angle between the transverse section 5 and the connecting section 4.

[0083] Once the transverse section 5 and the connecting section 4 need to be folded, force is applied to the sliding block 13, which will slide along the bolt 10 and compress the elastic element 18. At the same time, the sliding block 13 will pull the protrusion 14 completely into the receiving slot 16, after which the transverse section 5 and the connecting section 4 can rotate relative to each other.

[0084] Subsequently, once the force on the sliding block 13 is no longer applied, the elastic element 18 returns to its original position, causing the sliding block 13 and the protrusion 14 to slide from the receiving groove 16 to the limiting groove 17.

[0085] The movement of the sliding block 13 can be achieved by pressing it with an externally inserted push column.

[0086] Preferably, the hinge end of the first bushing 6 and the surface opposite to the first slot 11 are provided with an indented mounting groove 19; the mounting groove 19 is coaxially arranged with the through hole 8; the limiting member 9 also includes a pusher 20 disposed in the mounting groove 19, the pusher 20 is movably connected in the mounting groove 19 and coaxially arranged with the mounting groove 19, the pusher 20 has an insertion end 21 that passes through the bottom of the mounting groove 19 and abuts against the surface of the sliding block 13, the insertion end 21 is configured to push the sliding block 13 to slide along the outer periphery of the bolt 10.

[0087] Preferably, the end of the insertion end 21 is provided with a stop portion 22 to restrict the insertion end 21 from sliding out of the mounting groove 19.

[0088] With the above design, the operator can move the sliding block 13 by pushing the pusher 20.

[0089] Specifically, if the transverse section 5 and the connecting section 4 need to be folded, press the pusher 20 directly to make the pusher 20 enter the mounting groove 19. During this process, the insertion end 21 pushes the sliding block 13 to slide along the outside of the bolt 10.

[0090] Once the pressing force on the pusher 20 is no longer applied, the elastic member 18 resets, causing the sliding block 13 and the protrusion 14 to slide from the receiving groove 16 to the limiting groove 17. Due to the presence of the stop part 22, the insertion end 21 will not slide out of the mounting groove 19, but will remain in contact with the surface of the sliding block 13.

[0091] It should be noted that the transverse segment 5 is connected to the first bushing 6 and the connecting segment 4, respectively. Therefore, when the transverse segment 5 and the connecting segment 4 rotate relative to each other, the first bushing 6 and the second bushing 7 rotate relative to each other.

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

[0093] Working principle: The whole unit has two states: unfolded and folded. These will be explained separately below: In the unfolded state, the transverse segment 5 and the connecting segment 4 are at a set angle. At this time, each receiving slot 16 and each limiting slot 17 are aligned with each other, and the protrusion 14 is simultaneously located in the aligned receiving slot 16 and limiting slot 17 so that the relative rotation of the first bushing 6 and the second bushing 7 is constrained. In this way, once the first bushing 6 or the second bushing 7 is subjected to force, a rotational tendency is generated. Since the protrusion 14 simultaneously abuts against the inner wall of the receiving slot 16 and the limiting slot 17, the purpose of simultaneously restricting the first bushing 6 and the second bushing 7 is achieved.

[0094] Once it is necessary to guide the transverse section 5 and the connecting section 4 into a folded state, press the pusher 20 directly to make the pusher 20 enter the mounting groove 19. During this process, the insert end 21 pushes the sliding block 13 to slide along the outer periphery of the bolt 10. When the sliding block 13 slides along the bolt 10, it will compress the elastic element 18 to store force. At the same time, the sliding block 13 will pull the protrusion 14 to fully enter the receiving groove 16, after which the transverse section 5 and the connecting section 4 can rotate relative to each other.

[0095] Once the pressing force on the pusher 20 is no longer applied, the elastic member 18 resets, causing the sliding block 13 and the protrusion 14 to slide from the receiving groove 16 to the limiting groove 17. Due to the presence of the stop part 22, the insertion end 21 will not slide out of the mounting groove 19, but will remain in contact with the surface of the sliding block 13.

[0096] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A folding handle structure for a trolley, characterized in that: The trolley includes a vertically arranged frame (1) and a support plate (2) rotatably arranged at the bottom of the frame (1). The frame (1) is provided with a handrail (3). The armrest (3) includes two connecting sections (4) and a transverse section (5). The transverse section (5) is U-shaped. The two connecting sections (4) are symmetrically arranged and positioned on the side of the frame (1). Each connecting section (4) is arranged along the length of the frame (1). Both ends of the transverse section (5) are connected to the upper ends of the two connecting sections (4) respectively through a folding structure. The folding structure includes a first bushing (6) and a second bushing (7). The end of the first bushing (6) is hinged to the end of the second bushing (7), and the other end of the first bushing (6) is connected to the other end of the second bushing (7). One of them is positioned and connected to the end of the connecting section (4), and the other is positioned and connected to the end of the transverse section (5), so that the connecting section (4) and the transverse section (5) form an unfolded state and a folded state. A limiting member (9) is provided at the hinge point between the first bushing (6) and the second bushing (7). The limiting member (9) acts on the first bushing (6) and / or the second bushing (7) to limit the relative rotation between the first bushing (6) and the second bushing (7). In the unfolded state, the transverse section (5) and the connecting section (4) are at a set angle, and the limiting member (9) is configured to limit the rotation of the first bushing (6) and the second bushing (7) so that the transverse section (5) and the connecting section (4) are maintained at a set angle. In order to enter the folded state, the external force is applied to release the rotation restriction of the first bushing (6) and the second bushing (7) by the restrictor (9), and push the transverse section (5) to rotate around the hinge point to realize the folding of the transverse section (5) and the connecting section (4).

2. The folding handle structure of the trolley according to claim 1, characterized in that: The hinge point of the first bushing (6) and the second bushing (7) is provided with a through hole (8), and the first bushing (6) and the second bushing (7) are hinged by a bolt (10), which is set in the through hole (8) and is coaxial with the through hole (8); The bolt (10) is provided with a limiting element (9), which acts on the first bushing (6) and / or the second bushing (7) to restrict the rotation of the first bushing (6) and the second bushing (7).

3. The folding armrest structure of the trolley according to claim 2, characterized in that: The hinge end of the first bushing (6) is recessed with a first slot (11). The hinge end of the second bushing (7) is recessed with a second slot (12), and the opening of the first slot (11) faces the opening of the second slot (12). When the first bushing (6) and the second bushing (7) are hinged, the first slot (11) and the second slot (12) are aligned with each other and form an annular groove structure. The through hole (8) is coaxial with the first slot (11) and the second slot (12). The limiting member (9) is disposed within the annular groove structure and sleeved on the outer wall of the bolt (10), and the limiting member (9) is configured to slide along the axis of the bolt (10).

4. The folding handle structure of the trolley according to claim 3, characterized in that: The limiting component (9) includes a sliding block (13) that is slidably 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 axis of the bolt (10); The outer periphery of the sliding block (13) is provided with a plurality of protrusions (14) protruding radially, and all the protrusions (14) are evenly distributed around the axis of the sliding block (13); The annular groove structure is provided with multiple locking slots (15), and each locking slot (15) is matched with each protrusion (14) in a one-to-one correspondence; The protrusion (14) and the locking groove (15) constrain the rotational movement of the first bushing (6) and / or the second bushing (7) relative to the bolt (10).

5. The folding handle structure of the trolley according to claim 4, characterized in that: The card slot (15) includes multiple card receiving slots (16) and multiple card limiting slots (17); Each receiving slot (16) and each limiting slot (17) are arranged along the axial direction of the sliding block (13); The receiving slot (16) is formed by the inner wall of the second slot (12) being recessed. The limiting slot (17) is formed by the indentation of the inner sidewall of the first slot (11); When the protrusion (14) and the slot (15) are engaged, each receiving slot (16) and each limiting slot (17) are aligned with each other, and the protrusion (14) is simultaneously in the aligned receiving slot (16) and limiting slot (17) so that the relative rotation of the first bushing (6) and the second bushing (7) is constrained.

6. The folding armrest structure of the trolley according to claim 5, characterized in that: The depth of the slot (16) is greater than or equal to the height of the protrusion (14); The depth of the limiting groove (17) is less than the height of the protrusion (14).

7. The folding armrest structure of the trolley according to claim 5 or 6, characterized in that: The limiting member (9) also includes an elastic member (18) which is sleeved on the outer peripheral sidewall of the bolt (10). The elastic member (18) acts on the sliding block (13) so that the sliding block (13) and the protrusion (14) have a tendency to slide from the receiving groove (16) to the limiting groove (17). By applying external force, the elastic force of the elastic element (18) is overcome, so that the sliding block (13) pulls the protrusion (14) to fully enter the receiving slot (16).

8. The folding armrest structure of the trolley according to claim 4, characterized in that: The hinge end of the first bushing (6) and the surface opposite to the first slot (11) are provided with an indented mounting groove (19). The mounting slot (19) and the through hole (8) are coaxially arranged; The limiting member (9) also includes a pusher (20) disposed in the mounting groove (19). The pusher (20) is movably connected in the mounting groove (19) and coaxially disposed in the mounting groove (19). The pusher (20) has an insertion end (21) that passes through the bottom of the mounting groove (19) and abuts against the surface of the sliding block (13). The insertion end (21) is configured to push the sliding block (13) to slide along the outer periphery of the bolt (10).

9. The folding armrest structure of the trolley according to claim 8, characterized in that: The end of the insertion end (21) is provided with a stop (22) to restrict the insertion end (21) from sliding out of the mounting groove (19).

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