A guide shoe for a platform ladder

Abstract

The utility model discloses a guide shoe for platform ladder belongs to platform ladder field, include: bottom plate, with the one end connection of bottom plate one side's bearing plate, two gyro wheel, gyro wheel includes axle body, noise reduction ring, wheel hub and wheel face, axle body and bearing plate are connected, and noise reduction ring is cast in wheel hub, and noise reduction ring and wheel hub are all through bearing rotation sleeve and connect in axle body outside, and wheel face cast in wheel hub outside, and the side of wheel face away from wheel hub is equipped with the central boss portion, with the other end connection of bottom plate one side's sliding plate, and sliding plate and gyro wheel are side by side interval arrangement, to make the accommodating space between sliding plate and gyro wheel. The utility model's technical effect lies in its gyro wheel not only has good wear resistance, and when working, is difficult to produce noise.

Description

Technical Field

[0001] This utility model relates to platform ladders, and more particularly to a guide shoe for platform ladders. Background Technology

[0002] A platform ladder is a lifting device specifically designed to solve the problem of barrier-free vertical access. Its main target users are people with mobility impairments (such as wheelchair users, the elderly, or people using walking aids).

[0003] Guide shoes are an important component of platform ladders. Guide shoes mainly consist of rollers, which are used to move in conjunction with guide rails. However, the rollers have poor wear resistance, which can lead to a short service life. In addition, the rollers can generate noise during operation. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a guide shoe for a platform ladder, whose rollers not only have good wear resistance, but also do not easily generate noise during operation.

[0005] Technical solution: A guide shoe for a platform ladder, comprising: Base plate; A support plate connected to one end of one side of the base plate; Two rollers, each roller comprising a shaft, a noise reduction ring, a hub, and a wheel surface. The shaft is connected to the bearing plate. The noise reduction ring is cast into the hub. Both the noise reduction ring and the hub are rotatably sleeved onto the shaft via bearings. The wheel surface is cast into the hub. A central protrusion is provided on the side of the wheel surface away from the hub. A sliding plate is connected to the other end of one side of the base plate. The sliding plate and the roller are arranged side by side at intervals so that a receiving space is formed between the sliding plate and the roller.

[0006] Optionally, the hub has a receiving groove, the noise reduction ring is cast into the receiving groove, and at least part of the noise reduction ring protrudes from the receiving groove.

[0007] Optionally, the hub is further provided with a plurality of limiting grooves that are all connected to the receiving groove, and the noise reduction ring is provided with a plurality of limiting teeth, the limiting teeth and the limiting grooves correspondingly cooperate.

[0008] Optionally, it also includes a plurality of through holes spaced circumferentially at intervals on the hub.

[0009] Optional, also includes: An eccentric block is provided, with the supporting plate rotatably connected to one end of the eccentric block, and one end of the eccentric block abutting against the base plate. A stud, which passes through the eccentric block and extends into the base plate; A nut is threadedly connected to the stud, and the other end of the nut abuts against the eccentric block.

[0010] Optionally, the eccentric block includes: The first and second eccentric plates are interconnected; A stepped portion formed at the connection between the first eccentric plate and the second eccentric plate; The bearing plate is rotatably connected to the outside of the first eccentric plate. The end of the first eccentric plate away from the second eccentric plate abuts against the base plate. The stud passes through the first eccentric plate and the second eccentric plate. The nut abuts against the end of the second eccentric plate away from the first eccentric plate. The stepped portion abuts against the bearing plate.

[0011] Optionally, the sliding plate includes a first plate and a second plate connected to each other, the first plate abutting against the base plate, the second plate being detachably connected to the base plate, and the second plate and the roller being arranged side by side with a gap, so that the receiving space is formed between the second plate and the roller.

[0012] Optionally, the connection between the first plate and the second plate is an integral molding connection.

[0013] Beneficial effects: (1) The material of the noise reduction ring in this scheme is preferably polyurethane, rubber and other elastic materials, which can be used to absorb and disperse the vibration of the platform ladder during operation by utilizing the elasticity of the material itself, thereby reducing the transmission of noise and achieving the noise reduction effect. (2) The central protrusion of this design, under the action of load, will make the contact between the wheel surface and the guide rail form a narrow, elliptical contact surface, rather than a line or a point. This contact surface is located at the center of the wheel surface and can adapt to small non-parallelism and deformation. When an error occurs, the contact surface will move naturally and smoothly to one side from the center, but always maintain a surface contact, avoiding a sharp increase in contact stress, thereby increasing wear uniformity, improving wear resistance, and extending service life. Attached Figure Description

[0014] Figure 1 This is one of the structural diagrams of a guide shoe for a platform ladder according to Embodiment 1 of this utility model; Figure 2 This is a second structural diagram of a guide shoe for a platform ladder according to Embodiment 1 of this utility model; Figure 3 This is the third structural diagram of a guide shoe for a platform ladder according to Embodiment 1 of this utility model; Figure 4 for Figure 3 A partial view in the image; In the diagram: 1. Base plate; 2. Bearing plate; 3. Roller; 31. Shaft; 32. Noise reduction ring; 321. Limiting tooth; 33. Hub; 331. Receiving groove; 332. Limiting groove; 333. Through hole; 34. Wheel surface; 341. Central protrusion; 35. Bearing; 4. Sliding plate; 41. First plate; 42. Second plate; 5. Receiving space; 6. Eccentric block; 61. First eccentric plate; 62. Second eccentric plate; 63. Step; 7. Stud; 8. Nut; 9. Guide rail. Detailed Implementation

[0015] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0017] Example 1 like Figures 1-4This embodiment provides a guide shoe for a platform ladder, including: a base plate 1; a support plate 2 connected to one end of one side of the base plate 1; two rollers 3, each roller 3 including a shaft 31, a noise reduction ring 32, a hub 33, and a wheel surface 34. The shaft 31 is connected to the support plate 2, the noise reduction ring 32 is cast into the hub 33, and both the noise reduction ring 32 and the hub 33 are rotatably sleeved on the outside of the shaft 31 through a bearing 35. The wheel surface 34 is cast into the outside of the hub 33, and a central protrusion 341 is provided on the side of the wheel surface 34 away from the hub 33; and a sliding plate 4 connected to the other end of one side of the base plate 1. The sliding plate 4 and the rollers 3 are arranged side by side with intervals to form an accommodating space 5 between the sliding plate 4 and the rollers 3.

[0018] Specifically, one side of the base plate 1 supports the bearing plate 2, sliding plate 4, etc., while the other side of the base plate 1 connects to the open platform of the relevant platform ladder. The bearing plate 2 supports two rollers 3, and the sliding plate 4 forms a receiving space 5 with the rollers 3. The receiving space 5 accommodates the guide rail 9, facilitating a rolling connection between one side of the guide rail 9 and the rollers 3, and a sliding connection between the other side of the guide rail 9 and the sliding plate 4. This allows the guide shoe of the platform ladder in this design to move along the guide rail 9. The guide rail 9 can be fixed to the relevant wall. The two rollers 3 ensure rolling stability. Good dynamic stability; the shaft 31 is supported by the bearing plate 2 and is used to rotate the bearing hub 33 and noise reduction ring 32 via the bearing 35, facilitating the rotation of the hub 33, noise reduction ring 32, and wheel surface 34 along the shaft 31; the noise reduction ring 32 is preferably made of elastic materials such as polyurethane and rubber, which can absorb and disperse the vibration during the operation of the platform ladder by utilizing the elasticity of the material itself, thereby reducing the transmission of noise and achieving a noise reduction effect. Due to the casting molding, the connection between the noise reduction ring 32 and the hub 33 is strong; the wheel surface 34 is used to cooperate with the guide rail 9, in the middle The central protrusion 341 is used to mate with the guide rail 9. Due to errors, the actual contact between the purely cylindrical wheel surface 34 and the guide rail 9 will degenerate from a line to one or two extremely small contact points, usually occurring at the edge of the wheel surface 34. This easily leads to the entire load being borne by this extremely small contact point, causing the contact stress in this area to increase sharply, far exceeding the allowable stress of the material. However, the central protrusion 341 in this design, under load, ensures that the contact between the wheel surface 34 and the guide rail 9 forms a narrow, elliptical contact surface, rather than a line or a single point. The contact surface is located at the center of the wheel surface 34 and can adapt to minor non-parallelism and deformation. When an error occurs, the contact surface will move naturally and smoothly to one side from the center, but always maintain a single surface contact to avoid a sharp increase in contact stress, thereby increasing wear uniformity, improving wear resistance, and extending service life. Since the wheel surface 34 is cast on the outside of the hub 33, it is easy to make the connection between the wheel surface 34 and the hub 33 strong. The materials of the wheel surface 34 and the central protrusion 341 are preferably polyurethane, and the two are preferably integrally molded and connected.

[0019] Furthermore, such as Figure 4 The hub 33 has a receiving groove 331, and the noise reduction ring 32 is cast into the receiving groove 331, with at least a portion of the noise reduction ring 32 protruding from the receiving groove 331.

[0020] Specifically, the receiving groove 331 is used to receive the noise reduction ring 32. Since at least part of the noise reduction ring 32 protrudes from the receiving groove 331, it is easy for the noise reduction ring 32 to make close contact with the outer ring of the bearing 35, thereby ensuring good noise reduction performance. It should be noted that before it is fitted with the bearing 35, at least part of the noise reduction ring 32 protrudes from the receiving groove 331. After the hub 33 and the outer ring of the bearing 35 are interference-fitted, the noise reduction ring 32 is squeezed and no longer protrudes from the receiving groove 331, but makes close contact with the outer ring of the bearing 35.

[0021] Furthermore, such as Figure 4 The hub 33 is also provided with several limiting grooves 332 that are all connected to the receiving groove 331, and the noise reduction ring 32 is provided with several limiting teeth 321, with the limiting teeth 321 and the limiting grooves 332 correspondingly cooperating.

[0022] Specifically, the limiting teeth 321 and the limiting grooves 332 are matched to further increase the connection between the noise reduction ring 32 and the hub 33. During production, molten polyurethane is poured into a mold containing the hub 33, and the hub 33 is provided with a receiving groove 331 and several limiting grooves 332. After the polyurethane solidifies, the noise reduction ring 32 is formed in the receiving groove 331, and the limiting teeth 321 are formed in the limiting grooves 332.

[0023] Furthermore, such as Figure 4 It also includes a number of through holes 333 spaced circumferentially on the hub 33.

[0024] Specifically, the through hole 333 facilitates both reducing the weight of the wheel hub 33 and increasing its heat dissipation performance.

[0025] Furthermore, such as Figure 3 It also includes: an eccentric block 6, a bearing plate 2 rotatably connected to one end of the eccentric block 6, one end of the eccentric block 6 abutting against the base plate 1; a stud 7, the stud 7 passing through the eccentric block 6 and extending into the base plate 1; and a nut 8 threadedly connected to the stud 7, the nut 8 abutting against the other end of the eccentric block 6.

[0026] Specifically, when adjustment is needed, the eccentric block 6 is rotated around the stud 7. The eccentric block 6 drives the bearing plate 2 and the roller 3 to move along the base plate 1, thereby changing the relative position of the roller 3 and the sliding plate 4, and thus changing the width of the accommodating space 5. This facilitates the adjustment of the width of the accommodating space 5 to fit the guide rail 9. After adjustment, the nut 8 is locked.

[0027] Furthermore, such as Figure 3The eccentric block 6 includes: a first eccentric plate 61 and a second eccentric plate 62 connected to each other; a stepped portion 63 formed at the connection between the first eccentric plate 61 and the second eccentric plate 62; wherein, the bearing plate 2 is rotatably connected to the outside of the first eccentric plate 61, the end of the first eccentric plate 61 away from the second eccentric plate 62 abuts against the bottom plate 1, the stud 7 passes through the first eccentric plate 61 and the second eccentric plate 62, the nut 8 abuts against the end of the second eccentric plate 62 away from the first eccentric plate 61, and the stepped portion 63 abuts against the bearing plate 2.

[0028] Specifically, the step portion 63, in conjunction with the base plate 1, serves to limit the position of the bearing plate 2.

[0029] Furthermore, such as Figures 1-2 The sliding plate 4 includes a first plate 41 and a second plate 42 connected to each other. The first plate 41 abuts against the base plate 1, and the second plate 42 is detachably connected to the base plate 1. The second plate 42 and the roller 3 are arranged side by side with intervals so that a receiving space 5 is formed between the second plate 42 and the roller 3.

[0030] Specifically, the first plate 41 is used to increase the contact area between the sliding plate 4 and the base plate 1 to ensure connection stability; the second plate 42 is used to form a receiving space 5 with the roller 3.

[0031] Furthermore, such as Figures 1-2 The connection between the first plate 41 and the second plate 42 is a one-piece molding connection.

[0032] Specifically, the one-piece molding connection facilitates the good integrity of the sliding plate 4, and the material of the sliding plate 4 can be polytetrafluoroethylene composite material, ultra-high molecular weight polyethylene, etc.

[0033] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A guide shoe for a platform ladder, characterized in that, include: Base plate (1); A support plate (2) is connected to one end of one side of the base plate (1); Two rollers (3), each roller (3) includes a shaft (31), a noise reduction ring (32), a hub (33), and a wheel surface (34). The shaft (31) is connected to the bearing plate (2). The noise reduction ring (32) is cast into the hub (33). The noise reduction ring (32) and the hub (33) are rotatably sleeved on the shaft (31) through a bearing (35). The wheel surface (34) is cast into the hub (33). The side of the wheel surface (34) away from the hub (33) is provided with a central protrusion (341). A sliding plate (4) is connected to the other end of one side of the base plate (1). The sliding plate (4) and the roller (3) are arranged side by side at intervals so that a receiving space (5) is formed between the sliding plate (4) and the roller (3).

2. A guide shoe for a platform ladder according to claim 1, characterized in that, The hub (33) is provided with a receiving groove (331), and the noise reduction ring (32) is cast in the receiving groove (331), and at least part of the noise reduction ring (32) protrudes from the receiving groove (331).

3. A guide shoe for a platform ladder according to claim 2, characterized in that, The hub (33) is also provided with a number of limiting grooves (332) that are all connected to the receiving groove (331), and the noise reduction ring (32) is provided with a number of limiting teeth (321) on the outside, and the limiting teeth (321) and the limiting grooves (332) are correspondingly engaged.

4. A guide shoe for a platform ladder according to any one of claims 1-3, characterized in that, It also includes a plurality of through holes (333) spaced circumferentially at intervals on the hub (33).

5. A guide shoe for a platform ladder according to any one of claims 1-3, characterized in that, Also includes: An eccentric block (6) is rotatably connected to one end of the eccentric block (6), and one end of the eccentric block (6) abuts against the bottom plate (1). A stud (7) passes through the eccentric block (6) and extends into the base plate (1); The nut (8) is threadedly connected to the stud (7), and the other end of the nut (8) abuts against the eccentric block (6).

6. A guide shoe for a platform ladder according to claim 5, characterized in that, The eccentric block (6) includes: The first eccentric plate (61) and the second eccentric plate (62) are connected to each other; A step portion (63) is formed at the connection between the first eccentric plate (61) and the second eccentric plate (62); The bearing plate (2) is rotatably connected to the outside of the first eccentric plate (61). The end of the first eccentric plate (61) away from the second eccentric plate (62) abuts against the bottom plate (1). The stud (7) passes through the first eccentric plate (61) and the second eccentric plate (62). The nut (8) abuts against the end of the second eccentric plate (62) away from the first eccentric plate (61). The step portion (63) abuts against the bearing plate (2).

7. A guide shoe for a platform ladder according to any one of claims 1-3, characterized in that, The sliding plate (4) includes a first plate (41) and a second plate (42) connected to each other. The first plate (41) abuts against the bottom plate (1). The second plate (42) is detachably connected to the bottom plate (1). The second plate (42) and the roller (3) are arranged side by side with a gap, so that the receiving space (5) is formed between the second plate (42) and the roller (3).

8. A guide shoe for a platform ladder according to claim 7, characterized in that, The connection between the first plate (41) and the second plate (42) is an integral molding connection.

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