Lifting step

Abstract

To provide a lifting step which has a hand rail and can be stored in a compact form.SOLUTION: A lifting step 1 of the disclosure includes: a bracket 2 fixed to a loading platform 12 of a truck 11; and a ladder unit 3 which is stowed in the bracket 2 in a drawable manner. The ladder unit 3 has: a ladder 5; a first gear shaft 7 supporting the ladder 5; a second gear shaft 8 which is disposed parallel to the first gear shaft 7; a hand rail 6 supported by the second gear shaft 8; and a holder 4 which pivotally supports the first gear shaft 7 and the second gear shaft 8. When the ladder 5 is rotated around an axis of the first gear shaft, the hand rail 6 rotates around an axis of the second gear shaft 8 in a reverse direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a step for ascending and descending the bed of a vehicle such as a truck. [Background technology]

[0002] Conventionally, there is known a technology for a step for ascending and descending that is permanently installed near the loading platform of a truck and can be assembled and used during loading and unloading work. For example, Patent Document 1 proposes a vehicle staircase that is stored in the bottom of the loading platform and can be pulled out and set up when in use. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-95120 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is desirable to provide handrails on such steps so that workers can climb up and down the platform safely. On the other hand, it is important that the steps are compact so as not to take up too much space around the platform.

[0005] Therefore, an object of the present disclosure is to provide a step for climbing up and down that has a handrail and can be stored compactly. [Means for solving the problem]

[0006] In order to solve the above problems, the step for climbing and descending of the present disclosure has the following features.

[0007] (1) A ladder unit comprising a bracket fixed to the bed of a vehicle and a ladder unit retractably stored in the bracket, the ladder unit including a ladder, a first gear shaft supporting the ladder, a second gear shaft arranged parallel to the first gear shaft, a handrail supported by the second gear shaft, and a holder supporting each of the first gear shaft and the second gear shaft, wherein the first gear shaft includes a first gear, and the second gear shaft includes a second gear meshing with the first gear, and when the ladder is rotated around the axis of the first gear shaft, the handrail rotates in the opposite direction around the axis of the second gear shaft.

[0008] (2) In the case of (1), the second gear has a smaller diameter than the first gear.

[0009] (3) In the case of (1) or (2), the holder includes a first slit that supports the first gear shaft so as to be slidable, and a second slit that supports the second gear shaft so as to be slidable.

[0010] (4) In the case of any one of (1) to (3), the holder includes a scaffold on at least a portion of the top surface. Effect of the Invention

[0011] The climbing step of the present disclosure has handrails, can be stored compactly, and has the advantage of being hassle-free to use because the handrails are automatically installed when the ladder is installed. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of an ascending / descending step according to one embodiment of the present disclosure; [Diagram 2] 2A and 2B are perspective views of the step for ascending and descending in FIG. 1 with the ladder stored and with the ladder installed, respectively. [Diagram 3] (a) is a plan view, and (b) is a left side view of the ladder when it is halfway pulled out. [Figure 4] Cross-sectional view taken along line AA. [Diagram 5]13A and 13B are a plan view and a right side view, respectively, showing the arrangement of a holder relative to a bracket. [Figure 6] FIG. 13A is a plan view and FIG. 13B is a right side view showing the arrangement of the ladder and handrail relative to the bracket. [Figure 7] FIG. 13 is an explanatory diagram illustrating the rotational movement of the ladder and handrail. [Figure 8] FIG. 1 is an explanatory diagram illustrating a method for installing a ladder and handrail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the present disclosure applied to a step for ascending and descending that is permanently installed on the bed of a truck will be described below with reference to the drawings. In the following description, the rotation direction of the first gear shaft 7 when the ladder 5 is installed will be referred to as the forward rotation, and the opposite rotation direction will be referred to as the reverse rotation.

[0014] 1 and 2 is permanently installed on the rear bottom surface of the bed 12 of a truck 11, and is composed of a bracket 2 fixed to the bed 12 of the truck 11, and a ladder unit 3 housed in the bracket 2 so that it can be pulled out. The bracket 2 is provided with a restricting piece 21 that restricts the movement of the ladder unit 3 toward the back of the bracket. The bracket 2, ladder unit 3, etc. are made of a metal material such as iron.

[0015] As shown in Figures 3 and 4, the ladder unit 3 is composed of a ladder 5, a first gear shaft 7 supporting the ladder 5, a second gear shaft 8 arranged parallel to the first gear shaft 7, a handrail 6 supported by the second gear shaft 8, and a holder 4 that supports each of the first gear shaft 7 and the second gear shaft 8.

[0016] The ladder 5 is provided in a nested manner, with the lower step 51-1 accommodated within the upper step 51-2. After being pulled out from the holder 4, the ladder 5 is rotated 75 degrees forward from the horizontal plane before use. The ladder 5 is used by pulling out the lower step 51-1 from the upper step 51-2. A rough surface 53 is formed on the top surface of each step 51 to prevent slipping. The rough surface 53 can be formed, for example, by punching the iron plate of the step 51 from the back side to the front side, forming a large number of tiny convex shapes that are raised in the shape of Mount Fuji. A handle hole 54 is provided at the tip of the ladder 5 for pulling out the ladder 5 by hand (see FIG. 2).

[0017] The handrail 6 is a rod-shaped member that is rotated 90 degrees from the horizontal plane and used in an upright position. The length of the handrail 6 is approximately the same as the length of the ladder 5 in its most shortened state. The tip of the handrail 6 is provided with a groove 61 to prevent slipping.

[0018] As shown in FIG. 5, the holder 4 has a top plate portion 41 and a side plate portion 44.

[0019] The top plate portion 41 has a notch 41a that receives the handrail 6 in an upright state. The top plate portion 41 also includes a foothold 42 on at least a portion of the top surface. The foothold 42 is formed with a rough surface 43 to prevent slipping. The rough surface 43 can be provided, for example, by punching the iron plate of the foothold 42 from the back side to the front side, and forming a large number of tiny protrusions that are raised in the shape of Mount Fuji.

[0020] The side plate portion 44 has a first slit 45 which axially supports the first gear shaft 7 so as to be slidable, and a second slit 46 which axially supports the second gear shaft 8 so as to be slidable. The first and second slits 45, 46 are provided on both the left and right side plate portions 44, and the first and second slits 45, 46 are arranged to face each other.

[0021] The first and second slits 45, 46 are formed parallel to each other along the longitudinal direction of the side plate portion 44. As shown in Fig. 6, the first and second slits 45, 46 each have a first end 45a, 46a that functions as a bearing portion when the first and second gear shafts 7, 8 rotate, and a second end 45b, 46b that is the other end of each of the first end 45a, 46a. When the holder 4 is housed in the bracket 2, the first and second gear shafts 7, 8 are disposed at the second end 45b, 46b, respectively.

[0022] 7(a), the first gear shaft 7 has a first gear. The first gear shaft 7 is fixed so as to be perpendicular to the longitudinal direction of the ladder 5.

[0023] The second gear shaft 8 has a second gear 81 that meshes with the first gear 71. The second gear shaft 8 is fixed so as to be perpendicular to the longitudinal direction of the handrail 6.

[0024] The first gear 71 and the second gear 81 mesh with each other and rotate in opposite directions. Therefore, when the ladder 5 is rotated in a predetermined direction, the rotation is transmitted to the handrail 6 via the first gear shaft 7, the first gear 71, the second gear 81, and the second gear shaft 8, and the handrail 6 automatically rotates in the opposite direction to the ladder 5.

[0025] As shown in Fig. 7(b), the second gear 81 is provided with a smaller diameter than the first gear 71. Therefore, if the rotation angle of the second gear 81 while the first gear 71 rotates θ1 is θ2, then θ1<θ2. In this case, it is particularly preferable to configure the gear ratio between the first gear 71 and the second gear 82 so that θ1=75 degrees and θ2=90 degrees. By configuring in this way, the handrail 6 can be automatically raised vertically while the ladder 5 is installed at an inclination of 75 degrees.

[0026] Next, a method for installing the ladder 5 and the handrail 6 in the ascending / descending step 1 constructed as above will be described with reference to FIG.

[0027] As shown in Fig. 8(a), when the ladder 5 is not in use, the ladder unit 3 is stored in the bracket 2. The ladder 5 and handrail 6 are folded in a plane and arranged under the top plate portion 41. At this time, the first and second gear shafts 7, 8 are arranged at the second ends 45b, 46b of the first and second slits 45, 46, respectively.

[0028] As shown in FIG. 8(b), when the ladder unit 3 is pulled out by placing a hand on the handle hole 54, the first and second gear shafts 7, 8 slide within the first and second slits 45, 46, respectively, and the ladder 5 and handrail 6 are pulled out from the holder 4.

[0029] As shown in Fig. 8(c), when the ladder 5 is rotated so as to be lowered, the handrail 6 rises up, and as shown in Fig. 8(d), when the ladder 5 is set up so as to have an inclination of 75 degrees, the handrail 6 rises up perpendicular (90 degrees) to the scaffolding 42. When the ladder 5 has finished being used, it can be stored by following the steps in reverse.

[0030] Therefore, according to the climbing step 1 of this embodiment, the handrail 6 is folded towards the ladder 5 and stored in the holder 4, so that the climbing step 1 can be stored compactly. Also, the handrail 6 stands up in conjunction with the action of lowering the ladder 5, so the effort required during use can be reduced. At this time, because the ladder 5 is provided in a nested shape, for example, even if the ground is raised or there is a step in the ground, the length of the ladder 5 can be freely adjusted, the inclination of the ladder 5 can be set to 75 degrees, and the handrail 6 can be set up to 90 degrees.

[0031] Furthermore, the operation of pulling out the holder 4 from the bracket 2 and then pulling out the ladder 5 and handrail 6 from the holder 4 can be performed in one go, which reduces the workload. In addition, part of the top plate 41 serves as the scaffold 42, so the ladder 5 can be used safely.

[0032] The present disclosure is not limited to the above-described embodiment, and the shape and configuration of each part can be appropriately modified without departing from the spirit of the present disclosure. [Explanation of symbols]

[0033] 1 Steps for climbing up and down 2 Bracket 3 Ladder Unit 4 Holder 5 ladder 6. Handrails 7 1st gear shaft 8 2nd gear shaft 11 Tracks 12 Cargo Bed 21 Regulatory piece 41 Top plate 42 Scaffolding 43 Rough surface (footing) 44 Side plate part 45 First slit (a: first end, b: second end) 46 Second slit (a: first end, b: second end) 61 Steps 53 Rough surface (step) 54 Handle hole 61 Groove 71 1st Gear 81 2nd Gear

Claims

1. A ladder unit is provided, the ladder unit being retractably accommodated in a bracket that is fixed to a bed of a vehicle. the ladder unit includes a ladder, a first gear shaft supporting the ladder, a second gear shaft arranged parallel to the first gear shaft, a handrail supported by the second gear shaft, and a holder supporting each of the first gear shaft and the second gear shaft, the first gear shaft includes a first gear; the second gear shaft includes a second gear that meshes with the first gear, A step for ascent and descent, characterized in that when the ladder is rotated around the axis of the first gear shaft, the handrail rotates in the opposite direction around the axis of the second gear shaft.

2. The step for ascending or descending according to claim 1 , wherein the second gear has a smaller diameter than the first gear.

3. The lift step according to claim 1 , wherein the holder includes a first slit that axially supports the first gear shaft so as to be slidable, and a second slit that axially supports the second gear shaft so as to be slidable.

4. The lifting step according to claim 1 , wherein the holder includes a foothold on at least a portion of a top surface.

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