Mobile platform ladder

Abstract

The utility model relates to the technical field of platform ladders, and particularly discloses a movable platform ladder which comprises a bearing ladder, a guardrail structure and a safety stop lever, the guardrail structure is fixedly connected to the bearing ladder, the safety stop lever is fixed to the guardrail structure, one end of the safety stop lever is rotationally connected with the guardrail structure, and the other end of the safety stop lever is rotationally connected with the bearing ladder. The other end of the safety stop lever is fixedly connected with the guardrail structure through a locking structure; the lower end of the bearing ladder is fixedly connected with a pulley frame body structure; the lifting rod drives the connecting frame to rotate by rotating the handle, so that the pulley is in contact with or away from the ground. According to the platform ladder, the problem that the safety stop lever falls off from the clamping groove due to the fact that the safety stop lever is touched by mistake is solved, and the safety performance of an operator when the platform ladder is used is improved; meanwhile, the platform ladder can be quickly moved and locked, the use efficiency is high, and the service life of the platform ladder is effectively prolonged.

Description

Technical Field

[0001] This application relates to the technical field of platform ladders, and in particular to a mobile platform ladder. Background Technology

[0002] Work such as interior decoration, warehouse stocking, and cleaning often requires the use of platform ladders for working at height. To facilitate use, conventional platform ladders typically employ a slot-type fixing device for the safety bar at the top. Workers simply flip the safety bar and engage it in the slot to lock it in place. Additionally, for easy movement, casters with a locking function are often installed at the bottom. Once moved to the designated location, the casters are locked in place to prevent movement; after work is completed, the locking device is released.

[0003] In actual use, if workers accidentally touch the safety bar from below the slot while working at height, the safety bar can easily fall out of the slot, posing a significant safety hazard. Furthermore, the locking devices on the casters often become loose or malfunction over time; prolonged placement in dark and damp environments can also damage the locking devices. Additionally, fixing the platform ladder requires sequentially unlocking the locking devices of each caster, resulting in low work efficiency. Therefore, a mobile platform ladder is urgently needed to solve these problems. Utility Model Content

[0004] To address the aforementioned issues, this application provides a mobile platform ladder that improves the safety of workers using the platform ladder while also increasing its opening efficiency.

[0005] This application provides a mobile platform ladder, which adopts the following technical solution:

[0006] A mobile platform ladder includes a support ladder, a guardrail structure, and a safety stop bar. The guardrail structure is fixedly connected to the support ladder, and the safety stop bar is fixedly connected to the guardrail structure. One end of the safety stop bar is rotatably connected to the guardrail structure, and the other end of the safety stop bar is fixedly connected to a locking rod. The locking rod is fixedly connected to the guardrail structure through a locking structure.

[0007] The locking structure includes a fixing block and a limiting plate. Multiple limiting plates are vertically fixed within the fixing block, each forming a first limiting groove, a second limiting groove, and a third limiting groove. An elastic element for providing elastic force is fixed in the first limiting groove, and a support block is fixed in the third limiting groove. A locking piece is rotatably mounted in the second limiting groove, with its axis of rotation parallel to the axis of the locking rod. One end of the locking piece extends into the first limiting groove, and the other end extends into the third limiting groove. A positioning groove is formed on the fixing block, and a locking groove for engaging the locking rod is formed on the locking piece. A sliding groove is formed at the end of the fixing block near the elastic element, and a wrench is fixedly connected to the end of the locking piece near the elastic element. The wrench extends from the sliding groove and slides up and down within it.

[0008] When the locking structure is unlocked, pressing the wrench causes the locking piece to rotate until the positioning groove and the opening of the snap-fit ​​groove coincide. The locking piece acts on the elastic element, compressing the elastic element, and the snap-fit ​​rod snaps into the snap-fit ​​groove through the positioning groove. When the wrench is released, the elastic element drives the locking piece to rotate until it abuts against the support block, so that the snap-fit ​​groove and the opening of the positioning groove do not coincide, and the snap-fit ​​rod is fixed in the locking structure.

[0009] By adopting the above technical solution, the platform ladder is equipped with a guardrail structure. The safety stop bar is fixed to the guardrail structure by a locking mechanism. When it is necessary to unlock the locking mechanism, press the wrench and move it downwards. The wrench drives the locking plate to rotate, so that the opening of the locking groove and the positioning groove are aligned. The locking rod of the safety stop bar can be inserted into the locking groove through the positioning groove. Then, release the wrench. The rotating plate has an upward lifting force under the action of the elastic element, so that the rotating plate rotates to abut against the top of the support block. At this time, the opening of the locking groove and the positioning groove are not aligned. The locking plate and the fixing block cooperate to limit the locking rod, thereby locking the locking rod. If it is necessary to open the safety stop bar, the wrench needs to be pressed again. Therefore, the problem of the safety stop bar falling out of the locking groove due to accidental contact is avoided, improving the safety performance of workers when using the platform ladder.

[0010] Optionally, the support ladder includes a platform, two front legs and two rear legs, with the two front legs and two rear legs respectively installed at opposite ends below the platform. Multiple step treads parallel to the ground are evenly arranged between the two front legs. Bottom connecting rods are connected between the two front legs, between the two rear legs, and between the front and rear legs.

[0011] By adopting the above technical solution, and by setting two front outriggers and two rear outriggers, with bottom connecting rods connecting the two front outriggers, the two rear outriggers, and the front and rear outriggers, good stability is provided.

[0012] Optionally, the guardrail structure includes a fence and several supporting posts. The supporting posts are vertically connected to the bottom of the fence, and the bottom end of the supporting posts is fixedly connected to the platform. A second handrail is connected to the lower part of the fence, and the other end of the second handrail is fixedly connected to the front support leg. A protective waist plate is fixedly connected to the supporting post. A first handrail is fixedly fixed to each of the two front support legs.

[0013] By adopting the above technical solutions, workers can hold onto the first and second handrails when going up and down the platform ladder, increasing their safety during the process of climbing up or down the platform; the guardrail structure and protective waist plate are used to increase the safety of workers on the platform.

[0014] Optionally, a pulley frame structure is also included, which is fixed below the bottom connecting rod. The pulley frame structure includes a connecting frame, a pulley, a first connecting plate, and a second connecting plate. One end of the first and second connecting plates is rotatably connected to the bottom connecting rod, and the other end of the first connecting plate is rotatably connected to the end of the connecting frame near the rear support leg. The other end of the second connecting plate is rotatably connected to the end of the connecting frame near the front support leg. The pulley is fixed below both ends of the connecting frame. A lifting rod is rotatably connected to the end of the connecting frame near the second connecting plate. A handle is vertically connected to the end of the lifting rod away from the bottom connecting rod. A limit plate is provided on the handle, and the handle is limited by the limit plate and the step tread. By rotating the handle, the lifting rod drives the connecting frame to rotate, causing the pulley to contact or move away from the ground.

[0015] By adopting the above technical solution, turning the handle causes the lifting rod to rotate, which in turn causes the connecting frame to rotate, allowing the pulleys to act on the ground and lift the platform ladder, thus detaching the front and rear outriggers from the ground, allowing the platform ladder to move. Turning the handle causes the lifting rod to rotate the connecting frame until the pulleys are off the ground, and the front and rear outriggers are stably supported on the ground, allowing workers to use the platform ladder normally. The pulley frame structure allows for quick movement and locking of the platform ladder, resulting in high efficiency and effectively extending the service life of the platform ladder.

[0016] Optionally, a reinforcing link is obliquely fixed between the two rear support legs.

[0017] By adopting the above technical solution, the reinforcement rods further enhance the support strength of the two rear support legs, which helps to increase the structural stability of the load-bearing ladder.

[0018] Optionally, anti-slip mats are provided on both the step treads and the platform.

[0019] By adopting the above technical solutions, anti-slip mats can increase the safety of workers using platform ladders and reduce the risk of slipping.

[0020] Optionally, the bottom ends of both the front and rear support legs are fixed with anti-slip seats.

[0021] By adopting the above technical solution, the anti-slip seat is used to enhance the friction between the platform ladder and the ground, making the platform ladder safer to use.

[0022] Optionally, a vertical plate is fixed to the periphery of the platform, and the vertical plate is located on the upper side of the platform.

[0023] By adopting the above technical solution, when workers are working on the platform and need to carry tools and other items, the upright plate can limit the items placed on the platform, reducing the risk of items falling off the platform.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The safety stop bar is fixed to the guardrail structure by a locking mechanism. If the safety stop bar needs to be removed, a wrench needs to be pressed. Therefore, the problem of the safety stop bar falling out of the slot due to accidental contact is avoided, thus improving the safety performance of workers when using the platform ladder.

[0026] 2. By setting up a pulley frame structure, the platform ladder can be moved and locked quickly, which is highly efficient and effectively extends the service life of the platform ladder.

[0027] 3. By installing anti-slip mats on the steps and platform, and fixing anti-slip seats at the bottom of the front and rear support legs, the friction is enhanced, making the platform ladder safer to use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the pulley frame in the locked state in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the overall structure of the guardrail structure according to an embodiment of this application;

[0030] Figure 3 This is a cross-sectional view of the locking structure in the locked state according to an embodiment of this application;

[0031] Figure 4 This is a cross-sectional view of the locking structure in the unlocked state according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the overall structure of the pulley frame structure according to an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the overall structure of the pulley frame in the unlocked state in the embodiments of this application.

[0034] Reference numerals: 1. Load-bearing ladder; 11. Platform; 111. Upright; 12. Front support leg; 121. Step; 13. Rear support leg; 14. Bottom connecting rod; 15. Reinforcing connecting rod; 16. First handrail; 17. Anti-slip seat; 2. Guardrail structure; 21. Fence; 22. Supporting upright; 23. Second handrail; 24. Protective waist board; 3. Safety stop bar; 31. Clip-on rod; 4. Locking structure; 41. Fixing block; 411. 42. Sliding groove; 43. Positioning groove; 44. Limiting plate; 45. First limiting groove; 46. Second limiting groove; 47. Third limiting groove; 48. Elastic element; 49. Support block; 40. Locking piece; 41. Snap-fit ​​groove; 42. Wrench; 50. Pulley frame structure; 51. Connecting frame; 52. Pulley; 53. First connecting plate; 54. Second connecting plate; 55. Lifting rod; 56. Handle; 57. Limiting piece. Detailed Implementation

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] This application discloses a mobile platform ladder, as shown in the embodiments below. Figure 1 The system includes a load-bearing ladder 1, a guardrail structure 2, and a safety stop bar 3. The guardrail structure 2 is fixedly connected to the load-bearing ladder 1, and the safety stop bar 3 is fixedly connected to the guardrail structure 2. One end of the safety stop bar 3 is rotatably connected to the guardrail structure 2, and the other end of the safety stop bar 3 is fixedly connected to the guardrail structure 2 through a locking structure 4, which is used to ensure the safe use of the platform ladder.

[0037] Specifically, the load-bearing ladder 1 includes a platform 11, two front support legs 12, and two rear support legs 13. The two front support legs 12 and the two rear support legs 13 are respectively installed at opposite ends below the platform 11. Multiple step treads 121 parallel to the ground are evenly arranged between the two front support legs 12. Bottom connecting rods 14 connect the two front support legs 12, the two rear support legs 13, and the front support legs 12 and the rear support legs 13. At the same time, a reinforcing connecting rod 15 is diagonally fixed between the two rear support legs 13 to increase the structural stability of the load-bearing ladder 1.

[0038] Furthermore, each of the two front support legs 12 is fixed with a first handrail 16, and both the step treads 121 and the platform 11 are equipped with anti-slip mats. When workers hold onto the first handrail 16 and step on the anti-slip mats on the step treads 121 and platform 11, the safety of the platform ladder is increased. Additionally, the bottom ends of both front support legs 12 and both rear support legs 13 are fixed with anti-slip seats 17 to enhance the friction between the platform ladder and the ground, making the platform ladder even safer to use.

[0039] Preferably, a vertical plate 111 is fixed to the periphery of the platform 11, and the vertical plate 111 is located on the upper side of the platform 11 to limit the items placed on the platform 11.

[0040] Reference Figure 1 and Figure 2 The guardrail structure 2 is fixedly connected to the platform 11. The guardrail structure 2 includes a fence 21 and four support posts 22. The four support posts 22 are vertically connected to the bottom of the fence 21, and the bottom end of the support posts 22 is fixedly connected to the platform 11. A second handrail 23 is integrally formed at the lower diagonal of the fence 21, and the other end of the second handrail 23 is fixedly connected to the front support leg 12 on the corresponding side. A protective waist plate 24 is fixedly connected to the support posts 22. The protective waist plate 24 is used to increase the safety of workers on the platform 11.

[0041] Reference Figure 2 and Figure 3 The safety stop bar 3 is installed at one end of the fence 21 near the front support leg 12. One end of the safety stop bar 3 is hinged to the fence 21, and the other end of the safety stop bar 3 is connected to a locking rod 31. The locking structure 4 includes a fixing block 41, which is fixed to the fence 21. The upper end of the fixing block 41 is recessed downward to form a positioning groove 42, and the locking rod 31 is installed in the positioning groove 42.

[0042] The fixing block 41 has a hollow structure. Inside the fixing block 41, four limiting plates 43 are vertically arranged. The four limiting plates 43 form a first limiting groove 431, a second limiting groove 432, and a third limiting groove 433, respectively. An elastic element 434 is fixed in the first limiting groove 431, and a support block 435 is fixed in the third limiting groove 433. A locking piece 44 is rotatably installed in the second limiting groove 432, with the rotating shaft parallel to the axis of the locking rod 31. One end of the locking piece 44 extends into the first limiting groove 431, and the other end of the locking piece 44 extends into the third limiting groove 433. The locking piece 44 is provided with a locking groove 441 for locking the locking rod 31. A wrench 442 is integrally formed on the locking piece 44. A sliding groove 411 is provided on the side wall of the fixing block 41 near the end of the elastic member 434. The wrench 442 extends out of the sliding groove 411 and can slide up and down in the sliding groove 411. When the wrench 442 is pressed and moved up and down, it drives the locking piece 44 to rotate synchronously around the pivot. In this embodiment, the elastic member 434 is a compression spring.

[0043] Reference Figure 3 and Figure 4When the wrench 442 is pressed down, the locking groove 441 on the locking piece 44 coincides with the opening of the positioning groove 42 on the fixing block 41. The locking rod 31 is engaged in the locking groove 441 through the positioning groove 42. At this time, the locking piece 44 abuts against the upper end of the compressed elastic element 434. When the wrench 442 is released, the elastic element 434 returns to its original shape. The elastic element 434 acts on the locking piece 44, giving the locking piece 44 an upward lifting force, which in turn drives the locking piece 44 to rotate until it abuts against the upper end of the support block 435. At this time, the locking groove 441 and the opening of the positioning groove 42 do not coincide. At the same time, the locking piece 44 and the fixing block 41 cooperate to limit the locking rod 31, so that the locking rod 31 is locked in the locking structure 4. The locking structure 4 provides a safer guarantee for the operator standing on the platform 11, avoiding the risk of falling due to accidental contact with the safety stop bar 3.

[0044] Reference Figure 5 and Figure 6 It also includes a pulley frame structure 5, which is fixedly connected to the bottom connecting rod 14. When the pulley frame structure 5 is locked, the operator can push or pull the platform ladder to move it horizontally. When the pulley frame structure 5 is unlocked, the two front support legs 12 and the two rear support legs 13 are stably supported on the ground, so that the operator can safely reach the platform 11 to start work, thus realizing the portable movement of the platform ladder.

[0045] The pulley frame structure 5 includes a connecting frame 51, four pulleys 52, two first connecting plates 53, and two second connecting plates 54. The four pulleys 52 are respectively installed at the bottom of the four corners of the connecting frame 51. One end of the two first connecting plates 53 and the two second connecting plates 54 are rotatably connected to the bottom connecting rod 14. The other end of the two first connecting plates 53 is hinged to the two corners of the connecting frame 51 near the rear support leg 13. The other end of the two second connecting plates 54 is hinged to the two corners of the connecting frame 51 near the front support leg 12, so that the bottom connecting rod 14 and the connecting frame 51 form a parallelogram mechanism.

[0046] Lifting rods 55 are provided on the inner sides of the two second connecting plates 54. The lifting rods 55 are arranged parallel to the second connecting plates 54, and the bottom ends of the lifting rods 55 correspond to the bottom ends of the second connecting plates 54. The rotating shaft at the upper end of the second connecting plate 54 passes through the bottom connecting rod 14 and is connected to the lifting rod 55. The rotating shaft at the lower end of the second connecting plate 54 passes through the connecting frame 51 and is connected to the lifting rod 55. A handle 56 is vertically connected to the end of the lifting rod 55 away from the bottom connecting rod 14. The handle 56 is located at the end of the lifting rod 55 away from the rear support leg 13. The handle 56 and the lifting rod 55 can be used to rest on the step tread 121. A limiting piece 57 is provided below the handle 56, and the handle 56 is engaged with the step tread 121 by the limiting piece 57.

[0047] Reference Figure 1 and Figure 6 When the platform ladder needs to be moved, pull the handle 56 towards the front support leg 12 to engage the limiting plate 57 on the outside of the step tread 121. The lifting rod 55 drives the connecting frame 51 to rotate, causing the pulley 52 to act on the ground to lift the carrying ladder 1, disengaging the front support leg 12 and the rear support leg 13 from the ground. At this time, the platform ladder can be pushed to move, and the pulley frame structure 5 is in a locked state. After moving to the designated position, lift the handle 56 towards the rear support leg 13. The lifting rod 55 drives the connecting frame 51 to rotate, disengaging the pulley 52 from the ground. At this time, the pulley frame structure 5 is in an unlocked state, and the two front support legs 12 and the two rear support legs 13 are stably supported on the ground, allowing the operator to use the platform ladder normally.

[0048] The implementation principle of a mobile platform ladder disclosed in this application is as follows: the operator steps onto the step 121, holds the first handrail 16 and the second handrail 23 to climb onto the platform 11, presses down the wrench 442, and rotates the locking piece 44 until the opening direction of the locking groove 441 is consistent with that of the positioning groove 42, and engages the locking rod 31 of the safety stop bar 3 into the locking groove 441. When the wrench 442 is released, the locking piece 44 rotates and moves under the action of the elastic force until it abuts against the support block 435, thus locking the safety stop bar 3. This provides a high level of safety for the operator.

[0049] Furthermore, the lower end of the platform ladder is fixed with a pulley frame structure 5. When the platform ladder needs to be moved, pull the handle 56 towards the front support leg 12, and the limiting plate 57 is engaged with the outside of the step tread 121. The lifting rod 55 drives the connecting frame 51 to rotate, so that the pulley 52 acts on the ground to lift the carrying ladder 1, and the front support leg 12 and the rear support leg 13 are disengaged from the ground. At this time, the platform ladder can be pushed to move, and the pulley frame structure 5 is in a locked state. When it is moved to the designated position, lift the handle 56 towards the rear support leg 13, and the lifting rod 55 drives the connecting frame 51 to rotate, so that the pulley 52 is disengaged from the ground. At this time, the pulley frame structure 5 is in an unlocked state, and the two front support legs 12 and the two rear support legs 13 are stably supported on the ground. The workers can use the platform ladder normally. The platform ladder has high opening efficiency and a long service life.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A mobile platform ladder, characterized in that, It includes a carrying ladder (1), a guardrail structure (2) and a safety stop (3). The guardrail structure (2) is fixedly connected to the carrying ladder (1). The safety stop (3) is fixedly connected to the guardrail structure (2). One end of the safety stop (3) is rotatably connected to the guardrail structure (2). The other end of the safety stop (3) is fixedly connected to a locking rod (31). The locking rod (31) is fixedly connected to the guardrail structure (2) through a locking structure (4). The locking structure (4) includes a fixing block (41) and a limiting plate (43). Multiple limiting plates (43) are provided, each vertically fixed in the fixing block (41) and forming a first limiting groove (431), a second limiting groove (432), and a third limiting groove (433). An elastic element (434) for providing elastic force is fixed in the first limiting groove (431). A support block (435) is fixed in the third limiting groove (433). A locking piece (44) is rotatably installed in the second limiting groove (432). The axis of rotation of the locking piece (44) is parallel to the axis of the locking rod (31). One end of the locking piece (44) extends into the first limiting groove (431), and the other end of the locking piece (44) extends into the third limiting groove (433); the fixing block (41) is provided with a positioning groove (42), and the locking piece (44) is provided with a locking groove (441) for locking the locking rod (31); the fixing block (41) is provided with a sliding groove (411) at one end near the elastic member (434), and a wrench (442) is fixedly connected to one end of the locking piece (44) near the elastic member (434), and the wrench (442) extends out from the sliding groove (411) and slides up and down in the sliding groove (411); When the locking structure (4) is unlocked, the wrench (442) is pressed to rotate the locking piece (44) until the positioning groove (42) and the opening of the snap-fit ​​groove (441) coincide. The locking piece (44) acts on the elastic element (434) to compress the elastic element (434). The snap-fit ​​rod (31) is snapped into the snap-fit ​​groove (441) through the positioning groove (42). When the wrench (442) is released, the elastic element (434) drives the locking piece (44) to rotate to abut against the support block (435), so that the opening of the snap-fit ​​groove (441) and the positioning groove (42) do not coincide. The snap-fit ​​rod (31) is fixed in the locking structure (4).

2. The mobile platform ladder according to claim 1, characterized in that, The carrying ladder (1) includes a platform (11), two front support legs (12) and two rear support legs (13). The two front support legs (12) and the two rear support legs (13) are respectively installed at opposite ends below the platform (11). Multiple step treads (121) parallel to the ground are evenly arranged between the two front support legs (12). Bottom connecting rods (14) are connected between the two front support legs (12), between the two rear support legs (13), and between the front support legs (12) and the rear support legs (13).

3. A mobile platform ladder according to claim 2, characterized in that, The guardrail structure (2) includes a fence (21) and several support posts (22). The support posts (22) are vertically connected to the bottom of the fence (21), and the bottom end of the support posts (22) is fixedly connected to the platform (11). A second handrail (23) is connected to the lower side of the fence (21), and the other end of the second handrail (23) is fixedly connected to the front support leg (12). A protective waist plate (24) is fixedly connected to the support post (22). A first handrail (16) is fixedly fixed on each of the two front support legs (12).

4. A mobile platform ladder according to claim 2, characterized in that, It also includes a pulley frame structure (5), which is fixed below the bottom connecting rod (14); the pulley frame structure (5) includes a connecting frame (51), a pulley (52), a first connecting plate (53), and a second connecting plate (54). One end of the first connecting plate (53) and the second connecting plate (54) are respectively rotatably connected to the bottom connecting rod (14), and the other end of the first connecting plate (53) is rotatably connected to the end of the connecting frame (51) near the rear support leg (13). The other end of the second connecting plate (54) is rotatably connected to the end of the connecting frame (51) near the front support leg (12). One end is rotatably connected, and the pulley (52) is fixed below both ends of the connecting frame (51); the end of the connecting frame (51) near the second connecting plate (54) is rotatably connected to a lifting rod (55), and the end of the lifting rod (55) away from the bottom connecting rod (14) is vertically connected to a handle (56). A limit piece (57) is provided on the handle (56), and the handle (56) is limited to the step tread (121) by the limit piece (57); by rotating the handle (56), the lifting rod (55) drives the connecting frame (51) to rotate, so that the pulley (52) contacts or moves away from the ground.

5. A mobile platform ladder according to claim 2, characterized in that, A reinforcing link (15) is obliquely fixed between the two rear support legs (13).

6. A mobile platform ladder according to claim 2, characterized in that, Anti-slip mats are provided on both the step treads (121) and the platform (11).

7. A mobile platform ladder according to claim 2, characterized in that, The bottom ends of the front support leg (12) and the rear support leg (13) are both fixed with anti-slip seats (17).

8. A mobile platform ladder according to claim 2, characterized in that, A vertical plate (111) is fixed to the periphery of the platform (11), and the vertical plate (111) is located on the upper side of the platform (11).

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