A convenient storage of herringbone ladder

Abstract

The utility model provides a kind of storage convenient herringbone ladder, belong to herringbone ladder technical field. Including folding ladder and handrail plate, folding ladder is equipped with left and right two front foot pipes and left and right two rear foot pipes, handrail plate bottom is fixed with two handrails, handrail is inserted into formation axial sliding pair via front foot pipe upper end port, locking pin and positioning spring are equipped in handrail, locking pin has the tendency of outward ejection under the action of positioning spring, rear foot pipe inside is fixedly provided with pressing block, when folding ladder is stored folding, rear foot pipe moves towards the direction close to front foot pipe, pressing block is pressed locking pin along preset motion trajectory to make it disengage locking state, realize the automatic contraction of locking pin. The utility model can realize single-handed operation of single person, store and open folding ladder, convenient operation, meanwhile, user does not need to press locking pin, and storage is more labor-saving.

Description

Technical Field

[0001] This utility model belongs to the field of A-frame ladder technology and relates to an A-frame ladder that is easy to store. Background Technology

[0002] A-frame ladders are popular among consumers because of their self-supporting structure (no need to lean against a wall) and the presence of a work platform for easy work.

[0003] Existing patent document CN209603857U discloses a folding A-frame ladder with a telescopic handrail structure. This ladder includes a folding A-frame ladder and a handrail, with the handrail being a separate component. The handrail is telescopically positioned at the top of the folding A-frame ladder, and a locking mechanism is provided between the handrail and the ladder. This invention's handrail and folding A-frame ladder telescopically cooperate to facilitate storage or packaging, reducing storage space and packaging size, thus lowering packaging and transportation costs. The prior art's handrail is separate from the ladder, and the handrail's height adjustment and telescopic movement are achieved through a locking mechanism, including a locking pin, a compression spring, and a frame-shaped end cap. The locking pin engages with a locking hole, allowing the handrail to be positioned at different heights.

[0004] However, the aforementioned existing technologies still have the following problems:

[0005] The aforementioned existing technology achieves the positioning of the handrail height at a synchronous height by setting a locking mechanism. However, when retracting the handrail, the locking mechanism adopts a design with independent spring locking pins at both ends. During the handrail retraction process, the operator must press both locking pins simultaneously to achieve synchronous unlocking. This mechanical structure makes it impossible to complete the operation with one hand. The existing solution requires a two-action coordination of "pressing-pressing" when retracting the handrail: the first operator must continuously apply force to keep the locking pins in the retracted state before the second operator can perform the handrail pressing action. This forced multi-person cooperation mode not only significantly reduces work efficiency, but also, although the return force design of the compression spring ensures the reliability of locking, it directly leads to an increase in the pressing resistance of the locking pins. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a convenient A-frame ladder to solve the problems mentioned in the background technology. This utility model can enable a single person to store the ladder, and the storage is convenient and labor-saving.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0008] A conveniently foldable A-frame ladder includes a folding ladder and a handrail. The folding ladder has two front leg tubes on the left and right and two rear leg tubes on the left and right. Two handrails are fixed at the bottom of the handrail and the handrails are inserted through the upper end of the front leg tubes to form an axial sliding pair.

[0009] The handrail is equipped with a locking pin and a positioning spring. The locking pin tends to pop outward under the action of the positioning spring.

[0010] A pressing block is fixedly provided on the inner side of the rear leg tube. When the folding ladder is folded and stored, the rear leg tube moves towards the front leg tube, and the pressing block presses against the locking pin along a preset movement trajectory to disengage it from the locked state, thereby realizing the automatic retraction of the locking pin.

[0011] Furthermore, the front leg tube has a limiting hole on its side wall that matches the locking pin. When the handrail extends to the working height, the locking pin passes through the limiting hole under the action of the positioning spring to form a positioning.

[0012] Furthermore, the pressing block is provided with an arc-shaped guide surface, and one end of the pressing block is provided with an annular protrusion. When the folding ladder is folded and stored, the rear leg tube moves towards the front leg tube, and the annular protrusion presses against the locking pin along the preset movement trajectory and is embedded in the limiting hole.

[0013] Furthermore, the folding ladder includes multiple steps, which are positioned between the left and right front leg tubes. The upper ends of the left and right front leg tubes are connected to the left and right rear leg tubes respectively via hinge joints.

[0014] Furthermore, the folding ladder also includes a long connecting rod, a short connecting rod, an upper crossbar, and a lower crossbar. The long connecting rod is rotatably engaged with several steps. The upper and lower crossbars are fixed between two rear foot tubes and arranged in parallel. The short connecting rods are rotatably engaged with the long connecting rod and the lower crossbar. When the folding ladder is opened, the rear end of the uppermost step rests on the upper crossbar.

[0015] Furthermore, a limiting frame is fixedly fitted onto the front foot tube, and a radially protruding limiting block is provided on the inner side wall of the limiting frame. An axial limiting groove is provided on the outer wall of the handrail to slide and cooperate with the limiting block. The length direction of the limiting groove is consistent with the extension and retraction direction of the handrail, and both the upper and lower ends of the limiting groove penetrate the handrail.

[0016] Furthermore, the top of the handrail has several placement slots, and the bottom wall of the placement slots has placement holes that penetrate the handrail.

[0017] Furthermore, the inner wall of the limiting groove has a stop block, which is formed by bending outward from the bottom of the limiting groove.

[0018] Furthermore, the thickness of the stop block is less than the depth of the limiting groove.

[0019] The beneficial effects of this utility model are:

[0020] This utility model enables single-person, single-hand operation to store and unfold the handrail of the folding ladder. Through the coupling design of the folding motion of the rear leg tube and the trajectory of the pressing block, the existing two-person, two-step operation of pressing the locking pin with both hands and pressing down the handrail is optimized into a single-person, single-action folding trigger, which improves storage efficiency and makes operation convenient. At the same time, the user does not need to press the locking pin, making storage more effortless.

[0021] This utility model incorporates a stop block. When the handrail is extended to its highest position, the limiting block abuts against the stop block in the limiting groove. The limiting block and the stop block in the limiting groove work together to constrain the maximum extension height of the handrail, thereby preventing the handrail from being pulled out of the front leg tube. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0024] Figure 2 This is a rear view of Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the pressing block according to Embodiment 1 of this utility model;

[0026] Figure 4 This is Embodiment 1 of the present utility model. Figure 1 Enlarged view of point A in the middle;

[0027] Figure 5 This is an assembly cross-sectional view of the handrail and stop block according to Embodiment 2 of this utility model;

[0028] Figure 6 This is a partial assembly cross-sectional view of the handrail and front leg tube according to Embodiment 1 of this utility model;

[0029] Figure 7 This is a structural schematic diagram of the handrail board according to Embodiment 1 of this utility model.

[0030] In the diagram: 1. Folding ladder; 2. Handrail; 3. Front leg tube; 4. Rear leg tube; 5. Handrail bar; 6. Locking pin; 7. Limiting block; 8. Pressing block; 9. Limiting groove; 10. Placement groove; 11. Placement hole; 12. Arc-shaped guide surface; 13. Annular protrusion; 14. Step; 15. Long connecting rod; 16. Short connecting rod; 17. Upper crossbar; 18. Lower crossbar; 19. Limiting frame; 20. Stop block. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0032] Example 1

[0033] like Figure 1-4 As shown in Figure 7, a conveniently foldable A-frame ladder includes a folding ladder 1 and a handrail 2. The folding ladder 1 is provided with two front leg tubes 3 on the left and right and two rear leg tubes 4 on the left and right. Two handrails 5 are fixed at the bottom of the handrail 2. The handrails 5 are inserted through the upper end of the front leg tube 3 to form an axial sliding pair. When the handrail 2 is pulled upward, the handrails 5 slide upward along the inner cavity of the front leg tube 3.

[0034] The handrail 5 is equipped with a locking pin 6 and a positioning spring. The locking pin 6 has an outward popping tendency under the action of the positioning spring.

[0035] A pressing block 8 is fixedly provided on the inner side of the rear leg tube 4. When the folding ladder 1 is folded and stored, the rear leg tube 4 moves towards the front leg tube 3. The pressing block 8 presses against the locking pin 6 along a preset movement trajectory to disengage it from the locked state, thereby realizing the automatic retraction of the locking pin 6.

[0036] The folding ladder 1 includes multiple footboards 14, which are positioned between two front leg tubes 3. The upper ends of the two front leg tubes 3 are connected to two rear leg tubes 4 via hinge joints. The folding ladder 1 also includes a long connecting rod 15, a short connecting rod 16, an upper crossbar 17, and a lower crossbar 18. The long connecting rod 15 is rotatably engaged with several footboards 14. The upper crossbar 17 and the lower crossbar 18 are fixed between the two rear leg tubes 4 and are arranged in parallel. The short connecting rod 16 is rotatably engaged with the long connecting rod 15 and the lower crossbar 18. When the folding ladder 1 is opened, the rear end of the uppermost footboard 14 rests on the upper crossbar 17.

[0037] The front leg tube 3 and rear leg tube 4 of the folding ladder 1 are unfolded to both sides. The long connecting rod 15 and the short connecting rod 16 rotate synchronously during the unfolding process until the rear end of the uppermost step 14 rests on the upper crossbar 17, forming a stable triangular support structure.

[0038] The top of the handrail 2 has several placement slots 10, and the bottom wall of each placement slot 10 has a placement hole 11 that penetrates the handrail 2. The placement slots 10 are used to hold tools, and the placement holes 11 are used to hold screwdrivers. The smaller diameter end of the screwdriver passes through the placement hole 11, and the bottom of the larger diameter end of the screwdriver abuts against the bottom wall of the placement slot 10.

[0039] like Figure 1-6As shown, the side wall of the front foot tube 3 is provided with a limiting hole that matches the locking pin 6. When the handrail 5 is extended to the working height, the locking pin 6 passes through the limiting hole under the action of the positioning spring to form a positioning. The preload of the positioning spring is in the same direction as the axis of the locking pin 6.

[0040] When the handrail 5 extends to the working height, the locking pin 6 pops outward under the elastic force of the positioning spring and automatically engages with the limiting hole on the side wall of the front leg tube 3 to complete the height locking.

[0041] like Figure 1 , 3 As shown, the pressing block 8 is provided with an arc-shaped guide surface 12, and one end of the pressing block 8 is provided with an annular protrusion 13. When the folding ladder 1 is folded and stored, the rear leg tube 4 moves towards the front leg tube 3, and the annular protrusion 13 presses against the locking pin 6 along the preset movement trajectory and is embedded in the limiting hole. Both the pressing block 8 and the annular protrusion 13 are made of rubber and have a certain elasticity.

[0042] like Figure 4 As shown, a limiting frame 19 is fixedly sleeved on the front foot tube 3. The inner side wall of the limiting frame 19 is provided with a radially protruding limiting block 7. The outer wall of the handrail 5 is provided with an axial limiting groove 9 that slides with the limiting block 7. The length direction of the limiting groove 9 is consistent with the extension and retraction direction of the handrail 5. Both the upper and lower ends of the limiting groove 9 penetrate the handrail 5.

[0043] The limiting block 7 and the limiting groove 9 of the handrail 5 can effectively prevent the handrail 5 from rotating and shifting. The sliding cooperation between the limiting groove 9 and the limiting block 7 ensures that there is no jamming during the retraction process.

[0044] The specific operation method of Embodiment 1 of this utility model is as follows:

[0045] When storing: control the rear leg tube 4 and the front leg tube 3 to move closer to each other, and apply force to fold the ladder frame 1. The rear leg tube 4 rotates around the hinge point, driving the pressing block 8 to move along the arc trajectory towards the locking pin 6.

[0046] As the folding angle increases, the arc-shaped guide surface 12 continuously presses the locking pin 6 inward, compressing the positioning spring until the annular protrusion 13 of the pressing block 8 contacts the end face of the locking pin 6, and the annular protrusion 13 is embedded in the limiting hole, so that the locking pin 6 completely exits the limiting hole.

[0047] After the locking pin 6 disengages from the limiting hole, the handrail 5 automatically slides down and retracts along the inner cavity of the front foot tube 3 under its own weight and the pressure of the operator's hand.

[0048] When the rear leg tube 4 is folded to be parallel to the front leg tube 3, the annular protrusion 13 of the pressing block 8 is embedded in the limiting hole of the front leg tube 3, which can achieve a certain effect of mechanical interlocking in the storage state.

[0049] This utility model embodiment 1 allows for single-person, single-hand operation to store and open the folding ladder 1, making storage more effortless. Furthermore, during the processing and production of this utility model product, the strength of the positioning spring can be enhanced, causing the locking pin 6 to pop outward under the elastic force of the positioning spring and automatically embed into the limiting hole on the side wall of the front leg tube 3, making the handrail 5 more stable and improving the support force of the handrail 5.

[0050] Example 2

[0051] like Figure 5 As shown, the inner wall of the limiting groove 9 has a stop 20. The stop 20 is formed by bending the bottom of the limiting groove 9 outward. The specific method of forming the stop 20 is to cut two equal-length cuts from the bottom to the top of the side wall of the limiting groove 9 using an external tool, and then bend the side wall of the limiting groove 9 between the two cuts outward by 90 degrees. The thickness of the stop 20 is less than the depth of the limiting groove 9.

[0052] When the handrail 5 is extended to the highest position, the limiting block 7 abuts against the stop block 20 in the limiting groove 9. The limiting block 7 and the stop block 20 in the limiting groove 9 cooperate to constrain the maximum extension height of the handrail 5 and prevent the handrail 5 from being pulled out of the front leg tube 3.

[0053] When installing the folding ladder 1, first, the limiting frame 19 is fitted onto the corresponding handrail 5 from top to bottom. The limiting block 7 enters through the top end of the handrail 5 along the limiting groove 9 and slides along the limiting groove 9. Then, the limiting frame 19 is fitted onto the front leg tube 3 and fixed with bolts. Finally, the lower end of the handrail plate 2 is fixed to the upper end of the two handrails 5.

[0054] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A conveniently foldable A-frame ladder, comprising a folding ladder (1) and a handrail (2), wherein the folding ladder (1) is provided with two front legs (3) on the left and right and two rear legs (4) on the left and right, characterized in that: Two handrails (5) are fixed at the bottom of the handrail plate (2), and the handrails (5) are inserted through the upper port of the front foot tube (3) to form an axial sliding pair; The handrail (5) is provided with a locking pin (6) and a positioning spring. The locking pin (6) has an outward popping tendency under the action of the positioning spring. A pressing block (8) is fixedly provided on the inner side of the rear leg tube (4). When the folding ladder (1) is folded and stored, the rear leg tube (4) moves towards the front leg tube (3). The pressing block (8) presses against the locking pin (6) along the preset movement trajectory to disengage it from the locked state, thereby realizing the automatic retraction of the locking pin (6).

2. The conveniently foldable A-frame ladder according to claim 1, characterized in that, The front leg tube (3) has a limiting hole on its side wall that is compatible with the locking pin (6). When the handrail (5) is extended to the working height, the locking pin (6) passes through the limiting hole under the action of the positioning spring to form a positioning.

3. The conveniently foldable A-frame ladder according to claim 2, characterized in that, The pressing block (8) is provided with an arc-shaped guide surface (12). One end of the pressing block (8) is provided with an annular protrusion (13). When the folding ladder (1) is folded and stored, the rear leg tube (4) moves towards the front leg tube (3). The annular protrusion (13) presses against the locking pin (6) along the preset movement trajectory and is embedded in the limiting hole.

4. The conveniently foldable A-frame ladder according to claim 1, characterized in that, The folding ladder (1) includes multiple footboards (14), which are positioned between the left and right front foot tubes (3). The upper ends of the left and right front foot tubes (3) are connected to the left and right rear foot tubes (4) respectively through hinge joints.

5. A conveniently foldable A-frame ladder according to claim 4, characterized in that, The folding ladder (1) also includes a long connecting rod (15), a short connecting rod (16), an upper crossbar (17), and a lower crossbar (18). The long connecting rod (15) is rotatably engaged with several steps (14). The upper crossbar (17) and the lower crossbar (18) are fixed between two rear foot tubes (4) and arranged in parallel. The short connecting rod (16) is rotatably engaged with the long connecting rod (15) and the lower crossbar (18). When the folding ladder (1) is opened, the rear end of the uppermost step (14) rests on the upper crossbar (17).

6. A conveniently foldable A-frame ladder according to claim 1, characterized in that, A limiting frame (19) is fixedly fitted onto the front foot tube (3). The inner side wall of the limiting frame (19) is provided with a radially protruding limiting block (7). The outer wall of the handrail (5) is provided with an axial limiting groove (9) that slides with the limiting block (7). The length direction of the limiting groove (9) is consistent with the extension and retraction direction of the handrail (5). Both the upper and lower ends of the limiting groove (9) penetrate the handrail (5).

7. A conveniently foldable A-frame ladder according to claim 1, characterized in that, The top of the handrail (2) has several placement slots (10), and the bottom wall of the placement slots (10) has a placement hole (11) that penetrates the handrail (2).

8. A conveniently foldable A-frame ladder according to claim 6, characterized in that, The inner wall of the limiting groove (9) has a stop (20), which is formed by bending the bottom of the limiting groove (9) outward.

9. A conveniently foldable A-frame ladder according to claim 8, characterized in that, The thickness of the stop (20) is less than the depth of the limiting groove (9).

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