Movable stair member

Abstract

To provide a movable stair member which is capable of changing the height of the entire staircase and is excellent in usability.SOLUTION: A movable stair member according to one embodiment of the present disclosure includes a main body having a pair of side frames facing each other and a plurality of treads that can be arranged in a staircase pattern of n steps (where n is an integer of 2 or greater) between the pair of side frames, and the number of steps in the staircase can be changed to k by removing treads from the (k+1)-th step or higher (where k is an integer of 1 or greater and n-1 or less) and arranging them on the k-th step.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a moving stair member. [Background technology]

[0002] When loading or unloading cargo onto the bed of a transport vehicle such as a truck, a gate or a lifting member is used as a foothold for workers. Furthermore, it is now mandatory for certain trucks to be equipped with lifting equipment for accessing the bed. An evacuation staircase for loading and unloading cargo onto a truck (Patent Document 1) has been proposed as a lifting member that can be installed on the bed of a truck. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-299369 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes an evacuation staircase that includes a frame that constitutes the staircase body. Patent Document 1 also describes a configuration in which the height of the frame can be changed by extending and contracting leg members.

[0005] However, in the configuration described in Patent Document 1, the distance between the installation surface and the stairs varies greatly depending on the length of the leg members. Therefore, for example, if the length of the leg members is increased when the height of the loading platform is high, the distance between the installation surface and the stairs may become too large, making it difficult to ascend and descend.

[0006] The present disclosure has been made based on the above circumstances, and aims to provide a movable stair component that is easy to use and allows the height of the entire staircase to be changed. [Means for solving the problem]

[0007] A movable staircase member according to one embodiment of the present disclosure comprises a main body having a pair of side frames facing each other and a plurality of treads that can be arranged in a staircase pattern of n steps (where n is an integer of 2 or greater) between the pair of side frames, and the number of steps in the staircase can be changed to k by removing treads from the k+1st step (where k is an integer of 1 or greater and n-1 or less) and arranging them on the kth step. [Effects of the Invention]

[0008] A movable staircase member according to one aspect of the present disclosure is capable of changing the height of the entire staircase and is highly usable. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic side view illustrating a moving stair member according to one embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic front view of the moving staircase member of FIG. [Figure 3] FIG. 3 is a schematic side view showing a state in which the number of steps of the staircase in the movable staircase member of FIG. 1 is changed. [Figure 4] FIG. 4 is a schematic front view of the moving staircase member of FIG. [Figure 5] FIG. 5 is a schematic rear view showing a first modified example of the movable staircase member of FIG. [Figure 6] 6 is a schematic perspective view showing a tilt holding portion of the movable staircase member of FIG. [Figure 7] 7 is a schematic enlarged view showing the inner surface of the rear frame of the movable staircase member of FIG. [Figure 8] FIG. 8 is a schematic diagram showing a state in which the movable staircase member of FIG. 5 is arranged relative to a transport vehicle. [Figure 9] FIG. 9 is a schematic rear view showing a second modified example of the movable staircase member of FIG. [Figure 10] FIG. 10 is a schematic diagram showing the movable staircase member of FIG. 9 placed relative to a transport vehicle. [Figure 11]FIG. 11 is a schematic side view showing a third modified example of the movable staircase member of FIG. [Figure 12] 12 is a schematic side view showing the state in which the ladder members of the movable staircase member of FIG. 11 are stored. [Figure 13] FIG. 13 is a schematic side view showing a fourth modified example of the movable staircase member of FIG. [Figure 14] FIG. 14 is a schematic side view showing a fifth modified example of the movable staircase member of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0011] (1) A movable staircase member according to one embodiment of the present disclosure comprises a main body having a pair of side frames facing each other and a plurality of treads that can be arranged in a staircase pattern of n steps (where n is an integer of 2 or greater) between the pair of side frames, and the number of steps of the staircase can be changed to k by removing treads from the k+1th step (where k is an integer of 1 or greater and n-1 or less) and arranging them on the kth step.

[0012] The movable staircase element can easily change the overall height of the staircase by removing the treads from the k+1th step onwards and placing them on the kth step. Furthermore, since the number of steps in the movable staircase element can be changed by removing or attaching the treads on the upper steps, workers can easily ascend and descend the stairs regardless of the overall height of the staircase. Therefore, the movable staircase element is highly user-friendly.

[0013] (2) In the above (1), it is preferable that a passageway be formed between the pair of side frames by one or more of the stepboards arranged on the top step, extending from the ascending / descending side of the stairs in the depth direction and allowing communication from the end in the depth direction to the outside. According to this aspect, workers can easily access the loading platform of the transport vehicle or the like through the passageway.

[0014] (3) In the above (1) or (2), in a standard state in which the plurality of treads are arranged in n steps, the number of treads on the (n-1)th step and below may each be one. According to this aspect, the number of steps in the staircase can be changed more easily.

[0015] (4) In any of the above (1) to (3), the movable staircase member may further include a raised portion disposed below the main body, and the raised portion may have a ladder member that can connect to the tread disposed at the bottom of the main body. According to this aspect, the length of the entire movable staircase member in the depth direction can be prevented from increasing, thereby improving the ease of handling of the movable staircase member.

[0016] (5) In any of (1) to (4) above, the movable stair member further includes a running mechanism that supports the main body, and the running mechanism has a pair of wheels that face each other in the opposing direction of the pair of side frames, and the diameter of the pair of wheels is preferably 30 cm or more. This aspect makes it easier to run the movable stair member over long distances. It can also be easily run on uneven ground such as bare ground or farm fields.

[0017] (6) In any of the above (1) to (5), the movable stair member may have at least one of a gate holder that holds the gate of the loading platform of the transport vehicle parallel to the bottom of the loading platform and a crossing board that can be hung across the loading platform of the transport vehicle. According to this aspect, loading and unloading of cargo on the loading platform of the transport vehicle can be performed easily and safely.

[0018] (7) In any of the above (1) to (6), the movable stair member may further include a fixing portion that can fix the main body to the loading platform of a transport vehicle using a string member. According to this aspect, it is possible to prevent movement or tipping over due to external forces during use.

[0019] (8) In any of the above (1) to (7), the movable stair member may further include stanchions detachably attached to the main body. This configuration can further improve safety during use of the movable stair member.

[0020] In this disclosure, "parallel" is not limited to parallel in the strict sense, but is a concept that includes approximately parallel (for example, an angle suitable for using the tilt as a mounting table or work table). "Topmost level" means the nth level in the reference state, and the kth level in other states.

[0021] [Details of the embodiment of the present invention] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, for the numerical values ​​described in this specification, only one of the upper and lower limit values ​​described may be adopted, or the upper and lower limit values ​​may be arbitrarily combined. In this specification, all combinable numerical ranges are described as suitable ranges. Furthermore, each figure is a schematic representation and may not correspond to actual dimensions, ratios, etc.

[0022] In this specification, the side of the movable stair member where the stairs are ascended and descended is referred to as the front, the depth side of the stairs as the rear, and the front-to-rear direction is represented by the X-axis. The width direction of the stairs is referred to as the lateral direction and represented by the Y-axis. The direction perpendicular to both the X-axis and the Y-axis is referred to as the height direction and represented by the Z-axis.

[0023] [First embodiment] <Moveable staircase components> The movable stair member 1 shown in Figures 1 to 4 comprises a main body 10 having a pair of side frames 11 facing each other and a plurality of treads 12 that can be arranged in a staircase pattern of n steps (where n is an integer of 2 or more) between the pair of side frames 11. The movable stair member 1 also comprises a running mechanism 13 that supports the main body 10, and a height-raising section 14 that is arranged below the main body 10. The number of steps in the staircase can be changed to k by removing a tread 12 from the k+1th step (where k is an integer of 1 to n-1) and placing it on the kth step.

[0024] The movable staircase member 1 can easily change the overall height of the staircase by removing the treads 12 from the (k+1)th step and above and placing them on the kth step. Furthermore, since the number of steps in the movable staircase member 1 can be changed by removing or attaching the treads on the upper step side (upper side in the height direction), workers can easily ascend and descend the stairs regardless of the overall height of the staircase. Therefore, the movable staircase member 1 is highly user-friendly.

[0025] (Main body) The main body 10 has a pair of side frames 11 between which a plurality of treads 12 are suspended, forming a staircase. The main body 10 may have a connecting frame that extends laterally (Y direction) and connects the pair of side frames 11 to each other. The connecting frame may, for example, have a rear frame that connects the rear ends of the pair of side frames 11 to each other, a front frame that connects the front ends of the pair of side frames 11 to each other, or an intermediate frame that connects the middle parts of the pair of side frames 11 to each other in the fore-and-aft direction (X direction).

[0026] (Side frame) Each of the pair of side frames 11 has a basic framework formed by connecting a plurality of vertical bars and a plurality of horizontal bars. In the pair of side frames 11, the number of horizontal bars may be the same as the number of steps of the treads 12 in the standard state. In other words, the number of horizontal bars in the pair of side frames 11 may be n. As shown in Figures 1 and 3, the pair of side frames 11 are arranged so that the number of treads 12 that can be set on the kth step in the staircase structure is greater than the number of treads 12 that can be set on the k+1th step. More specifically, if the number of treads 12 that can be set on the kth step is p k In this case, p k =p k+1 +1. The pair of side frames 11 are arranged so that the kth step 12 protrudes forward by just one step relative to the k+1th step 12 in a side view. With this configuration, the movable stair member 1 is configured so that the forward-protruding step 12 on each step can be used as a foothold to ascend and descend.

[0027] The lower limit of the distance H between adjacent horizontal bars of a pair of side frames 11 (i.e., the difference in height of one step in the staircase structure; see Figure 1) may be 280 mm, 300 mm, or 330 mm. On the other hand, the upper limit of the distance H may be 500 mm, 400 mm, or 370 mm. In the movable staircase member 1, if the number of stair steps is too large, the length in the front-to-rear direction will increase accordingly, which may reduce ease of handling. In this regard, by setting the distance H at or above the lower limit and ensuring a sufficient difference in height of one step, it is possible to improve ease of handling. Furthermore, by setting the distance H at or below the upper limit, the movable staircase member 1 can prevent difficulty in ascending and descending the stairs.

[0028] (Step board) The multiple step boards 12 are arranged so as to span between a pair of side frames 11. The step boards 12 are formed in a rectangular shape in a plan view. The multiple step boards 12 may have the same size or different sizes. For example, the movable staircase member 1 may have step boards 12 with different lengths in the front-to-rear direction.

[0029] The lower limit of the front-to-rear length L (see FIG. 1) of the step 12 may be 200 mm, 300 mm, or 350 mm, from the viewpoint of ease of ascending and descending and workability on the step 12. On the other hand, the upper limit of the front-to-rear length L may be 500 mm or 450 mm, from the viewpoint of preventing the front-to-rear length of the movable staircase member 1 from becoming too long.

[0030] The lower limit of the width W (see FIG. 2) of the step 12 may be 400 mm, 500 mm, or 550 mm, from the viewpoints of ease of ascending and descending, ease of working on the step 12, and prevention of tipping over during use. On the other hand, the upper limit of the width W may be 800 mm, 700 mm, or 650 mm, from the viewpoints of ensuring the mobility of the movable staircase member 1.

[0031] The total number of treads 12 can be equal to or greater than the number of staircase steps in the reference state. The total number of treads 12 may be the same as the number of staircase steps in the reference state, or may be greater than the number of staircase steps in the reference state. If the total number of treads 12 is greater than the number of staircase steps in the reference state, for example, the number of treads 12 on the nth step in the reference state may be two or more, or the number of treads 12 on the first step (also referred to as the "reference tread surface") in the reference state may be two or more.

[0032] The movable stair member 1 can have k steps by sliding the treads 12 on each of the k+1th and subsequent steps downward (more specifically, to the kth step).

[0033] As shown in FIGS. 1 and 2, in a standard state in which multiple treads 12 are arranged in n steps, it is preferable that the number of treads 12 on each of the (n-1)th and subsequent steps be one. According to this embodiment, as shown in FIGS. 3 and 4, for example, by removing one tread 12 from each of the (k+1)th to (n-1)th steps (the third to fourth steps in FIGS. 3 and 4), and then removing the nth step 12 and placing it on the kth step (the second step in FIGS. 3 and 4), the total number of steps in the staircase can be changed to k (two steps in FIGS. 3 and 4). This makes it easier to change the number of steps in the staircase. Furthermore, according to this embodiment, by reducing the number of treads 12 on each step, it is easier to prevent the length of the movable staircase member 1 in the front-to-rear direction from increasing. As a result, the handleability of the movable staircase member 1 can be improved.

[0034] It is also preferable that the number of treads 12 on each step of the movable staircase member 1 is one in the standard state. This configuration further improves the ease of changing the number of steps and the ease of handling of the movable staircase member 1.

[0035] Between the pair of side frames 11, one or more treads 12 arranged on the top step form a passageway from the ascending / descending side of the stairs to the end in the depth direction. Preferably, between the pair of side frames 11, one or more treads 12 arranged on the top step form a connecting passageway R extending from the ascending / descending side of the stairs to the depth direction and allowing communication from the end in the depth direction to the outside. The connecting passageway R is a passageway for moving between the ascending / descending side of the stairs and the outside. By having the connecting passageway R, the mobile stair member 1 can easily access the loading platform of a transport vehicle or the like by passing through the connecting passageway R.

[0036] (raised part) The raising portion 14 supports the main body 10 from below and raises the height of the main body 10 above the installation surface. The specific configuration of the raising portion 14 is not particularly limited, but for example, it can be configured to have support columns 14a connected to the main body 10 and protruding downward from the main body 10. The raising portion 14 may also have side frames 14b extending in the front-to-rear direction so as to be connected to the support columns 14a, and front frames 14c and rear frames extending in the lateral direction so as to be connected to the support columns 14a.

[0037] The raising portion 14 has a ladder member 15 that can connect to the step 12 located on the lowest step (first step, reference step surface) of the main body 10. By having the ladder member 15 in the raising portion 14, the length of the entire movable staircase member 1 in the front-to-rear direction can be prevented from increasing. That is, in the movable staircase member 1, the angle of the ladder member 15 relative to the installation surface is greater than the angle of the stairs relative to the installation surface. Therefore, by using the ladder member 15 instead of stairs in the elevator shaft from the installation surface to the lowest step of the main body 10, the length of the movable staircase member 1 in the front-to-rear direction can be reduced. As a result, the handleability of the movable staircase member 1 can be improved. Furthermore, by using the ladder member 15 instead of stairs in the elevator shaft from the installation surface to the lowest step of the main body 10, the weight of the entire movable staircase member 1 can be reduced.

[0038] The upper end of the ladder member 15 is positioned adjacent to the step 12 located at the lowest step of the main body 10. The upper end of the ladder member 15 is also rotatably connected to the main body 10. The ladder member 15 may be connected by a hinge. In this case, the pin and pin hole of the hinge may be provided with some play. According to this embodiment, the lower end of the ladder member 15 can easily conform to the installation surface even if the installation surface is uneven.

[0039] Since the ladder member 15 is rotatably connected to the main body 10, it may be fixed to the main body 10 in an upwardly rotated state when the movable staircase member 1 is moved. The means for fixing the ladder member 15 to the main body 10 is not particularly limited, and may be, for example, fastening. According to this embodiment, it is possible to easily prevent a decrease in ease of handling caused by the ladder member 15 when the movable staircase member 1 is moved. The ladder member 15 may be provided so as to be extendable. In this case, when the movable staircase member 1 is moved, the ladder member 15 may be contracted so as to move away from the installation surface.

[0040] Furthermore, the ladder member 15 may be arranged so as to extend vertically downward from the main body 10. In this case, the lower end of the ladder member 15 may be spaced apart from the installation surface. This configuration facilitates the compactness of the movable stair member 1 and also improves the ease of handling of the movable stair member 1. Furthermore, the ladder member 15 may be configured to be detachable using pins and hooks, etc.

[0041] Casters (not shown) may be provided at the lower end of the ladder member 15. In this case, the ladder member 15 preferably has a stopper to prevent the casters from rotating. The ladder member 15 may also have a sole 15b with a rotation axis 15a at the lower end. According to this embodiment, the angle of the sole 15b can be adjusted to match the unevenness of the installation surface.

[0042] The step S of one step of the ladder member 15 when in use (see FIG. 1) can be the same as the step of one step in a staircase structure.

[0043] The lower limit of the total number of steps in the movable stair member 1 (the number of steps in the stair structure (the number of steps when the lowest step is counted as the first step) + the number of steps in the ladder member 15) is preferably 5 steps, and more preferably 6 steps, from the viewpoints of ensuring reliable access to and from the bed of the transport vehicle and making it easy to wrap ropes around cargo during loading operations, etc. On the other hand, the upper limit of the total number of steps is preferably 8 steps, and more preferably 7 steps, from the viewpoint of ease of handling the movable stair member 1. The height of the bed of the transport vehicle is approximately 810 to 1050 mm for small trucks (2 to 5 ton vehicles), approximately 1020 to 1095 mm for medium-sized trucks (7.5 to 8 ton vehicles), and approximately 1000 to 1450 mm for large trucks (8 ton vehicles). In addition, the height limit for loading onto the bed of a transport vehicle is generally set at 3.8 meters. Assuming a bed height of 1.5 meters, the maximum load height is 2.3 meters, making it difficult for workers to handle the height limit alone. Furthermore, the height limit is set at 4.1 meters for roads designated for height restrictions, but is permitted up to 4.3 meters with a permit for loading beyond the limit. In either case, workers' height alone is not sufficient. On the other hand, for example, if a staircase structure has a step height of 350 mm and a total of six steps, work can be performed at a height of up to 2100 mm. If a staircase structure has a step height of 350 mm and a total of seven steps, work can be performed at a height of up to 2450 mm. This allows easy and safe loading and unloading of loads and tying ropes to loads, regardless of the type of truck, from small to large.

[0044] The lower limit of the ratio of the number of stages in the main body 10 to the total number of stages may be 0.5 or 0.6, while the upper limit of the ratio may be 0.8 or 0.7.

[0045] (Traveling mechanism) The traveling mechanism 13 has a pair of wheels that face each other in the opposing direction of the pair of side frames 11. In this embodiment, the traveling mechanism 13 has two pairs of wheels (a pair of front wheels 13a and a pair of rear wheels 13b) that face each other in the opposing direction of the pair of side frames 11. The diameter of the wheels 13a, 13b is 30 cm or more. The wheels 13a, 13b make it easier for the mobile staircase member 1 to travel long distances. In addition, it is easier to travel on uneven ground such as bare ground or farm fields.

[0046] Front wheels 13a and rear wheels 13b are disposed at the lower ends of support posts 14a that constitute raised portion 14. Front wheels 13a are disposed at the front end of main body 10, and rear wheels 13b are disposed at the rear end of main body 10. In a side view, the front end of front wheels 13a may protrude forward beyond main body 10. In addition, in a side view, the rear end of rear wheels 13b may protrude rearward beyond main body 10. Traveling mechanism 13 preferably has stoppers (not shown) for preventing rotation of front wheels 13a and rear wheels 13b.

[0047] It is preferable that either the front wheels 13a or the rear wheels 13b be configured to be rotatable around the Z axis. The mechanism for rotating the front wheels 13a and the rear wheels 13b is not particularly limited, but an example is a configuration in which the front wheels 13a and the rear wheels 13b are arranged on the support 14a via a connector that is rotatable around the Z axis. Of the four wheels 13a, 13b, one or more of the wheels 13a, 13b may be configured to be height adjustable.

[0048] [Second embodiment] <Moveable staircase components> A first modification of the movable staircase member 1 of FIGS. 1 to 4 will be described with reference to FIGS.

[0049] The movable stair member 2 in Fig. 5 is equipped with at least one of a gate holder 20 that holds the gate of the loading platform of the transport vehicle parallel to the bottom of the platform, and a bridge plate (not shown) that can be hung across the loading platform of the transport vehicle. The movable stair member 2 also has a fixing portion 21 that can fix the main body 10 to the loading platform of the transport vehicle using a string member. The movable stair member 2 can be configured similarly to the movable stair member 1 in Figs. 1 to 4, except for the gate holder 20 and / or bridge plate, and the fixing portion 21. Therefore, in the following, explanations of the same configuration as the movable stair member 1 in Figs. 1 to 4 will be omitted.

[0050] (Tilt holder and gangway) In this embodiment, the gate holder 20 or the crossing plate is disposed on the rear frame 14d of the raised portion 14, more specifically, on the outer surface of the rear frame 14d. The gate holder 20 or the crossing plate may also be disposed on the rear frame of the main body 10. The gate holder 20 or the crossing plate is connected to the upper end of a connector 22 that is extendable and contractible in the vertical direction relative to the rear frame 14d. With this configuration, the gate holder 20 or the crossing plate can be adjusted in its vertical position to match the height of the loading platform. The crossing plate may be extendable or foldable.

[0051] Fig. 6 shows the specific configuration of the gate holder 20. As shown in Fig. 6, the gate holder 20 has a main body 20a with an L-shaped cross section. As shown in Figs. 6 and 8, the main body 20a has a bottom plate 20b that supports the gate A from below when it is spread out parallel to the bottom surface of the bed, and side plate 20c that supports the gate A from the side.

[0052] As shown in FIG. 6 , the tilt holder 20 is configured to be angularly displaceable in two orthogonal directions, the X and Y directions. Specifically, the tilt holder 20 has a main body 20a connected to a connecting piece 20d, which is connected to a connector 22 to be angularly displaceable in the X direction, and the main body 20a is angularly displaceable in the Y direction. As a result, the main body 20a is configured to be angularly displaceable in a combined direction around the X and Y axes. This configuration allows the posture of the main body 20a to change in response to changes in the posture of the tilt A, thereby more reliably holding the tilt A. The tilt holder 20 may be configured to limit the angular displacement of the main body 20a so that it does not exceed a predetermined value. For example, when the angular displacement exceeds the predetermined value, interference occurs between the connector 22 and the connecting piece 20d, and between the connecting piece 20d and the main body 20a. Since the tilt holder 20 only needs to be able to follow changes in the posture of the tilt A, a ball joint structure, for example, may be used in addition to the universal joint structure described above. Furthermore, in the movable staircase member 2, the gate holder 20 can be fixed to the connector 22 so as not to move.

[0053] The movable stair member 2 includes at least one of a gate holder 20 that holds the gate A of the loading platform of the transport vehicle parallel to the bottom surface of the loading platform, and a crossing plate that can be hung across the loading platform of the transport vehicle, thereby enabling easy and safe loading and unloading of cargo on the loading platform of the transport vehicle, and tying ropes around cargo. In particular, since the movable stair member 2 has the gate holder 20 or crossing plate arranged on the rear frame 14d, by attaching it vertically to the loading platform of the transport vehicle (arranging so that the rear end is adjacent to the loading platform) as shown in Fig. 8, it enables easy and safe loading and unloading of cargo on the loading platform of the transport vehicle, and tying ropes around cargo.

[0054] (fixed part) The fixing portion 21 is provided at a position adjacent to the loading platform when the movable stair member 2 is attached vertically to the loading platform of a transport vehicle. The fixing portion 21 may be arranged, for example, on the rear frame 14d of the raising portion 14, or on the rear frame of the main body 10 (in FIG. 7, the fixing portion 21 is arranged on the inner surface of the rear frame 14d). As shown in FIG. 7, the fixing portion 21 has a cleat 21a. As shown in FIGS. 7 and 8, the fixing portion 21 can fix the main body 10 to the loading platform by winding one end of a string member M attached to a hook on the loading platform of the transport vehicle around the cleat 21a.

[0055] The movable staircase member 2 is provided with the fixing portion 21, so that it can be prevented from moving or falling over due to an external force during use.

[0056] [Third embodiment] <Moveable staircase components> A second modification of the movable staircase member 1 of FIGS. 1 to 4 will now be described with reference to FIGS.

[0057] The movable stair member 3 in Figure 9 includes at least one of a gate holder 20 that holds the gate of the loading platform of the transport vehicle parallel to the bottom of the platform, and a bridge plate (not shown) that can be hung across the loading platform of the transport vehicle. The movable stair member 3 also includes a fixing portion 21 that can fix the main body 10 to the loading platform of the transport vehicle using a string member. The movable stair member 3 can be configured similarly to the movable stair member 2 in Figure 5, except that the arrangement of the gate holder 20 and / or the bridge plate, and the arrangement of the fixing portion 21 are different from those of the movable stair member 2 in Figure 5. Therefore, hereinafter, a description of the same configuration as the movable stair member 2 in Figure 5 will be omitted.

[0058] (Tilt holder and gangway) In this embodiment, the gate holder 20 or the bridge plank is disposed on the side frame 14b of the raised portion 14, more specifically, on the outer surface of the side frame 14b. The gate holder 20 or the bridge plank may also be disposed on the side frame 11. The gate holder 20 or the bridge plank is connected to the upper end of a connector 22 that is extendable and contractible in the vertical direction relative to the side frame 14b. With this configuration, the gate holder 20 or the bridge plank can be adjusted in its vertical position to match the height of the loading platform.

[0059] The movable stair member 3 includes at least one of a gate holder 20 that holds the gate A of the loading platform of the transport vehicle parallel to the bottom of the platform and a crossing plate that can be hung across the platform of the transport vehicle, thereby enabling easy and safe loading and unloading of cargo on the platform of the transport vehicle, and tying ropes around the cargo. In particular, since the gate holder 20 or crossing plate is arranged on the side frame 14b of the movable stair member 3, by placing it alongside the platform of the transport vehicle (arranged so that the side is adjacent to the platform) as shown in FIG. 10, loading and unloading of cargo on the platform of the transport vehicle, and tying ropes around the cargo can be performed easily and safely. Note that in the past, when the cargo to be loaded onto the platform of the transport vehicle was high, workers sometimes had to stand on the gate with the platform gate closed to perform the work. In this regard, by providing the movable stair member 3 with stairs that extend to a position higher than the gate A as shown in Figure 10, it is possible to move from the second step of the stairs to the loading platform, for example, and to climb to the third step of the stairs to perform rope work, making it easy to achieve both work efficiency and safety.

[0060] (fixed part) The fixing portion 21 is provided at a position adjacent to the loading platform when the movable stair member 3 is parked next to the loading platform of a transport vehicle. The fixing portion 21 may be disposed, for example, on the side frame 14b of the raising portion 14, or on the side frame of the main body 10. By providing the fixing portion 21, the movable stair member 3 can be prevented from moving or tipping over due to external forces during use.

[0061] [Fourth embodiment] <Moveable staircase components> A third modification of the movable staircase member 1 of FIGS. 1 to 4 will now be described with reference to FIGS.

[0062] 11 and 12 includes stanchions (supports) 41 that are detachably arranged on the main body 10. The movable stair member 4 includes a plurality of stanchions 41 arranged at intervals in the front-to-rear direction on the side frames 11. The movable stair member 4 also includes ropes 42 that are hung across the plurality of stanchions 41. The plurality of stanchions 41 may be configured to be detachably attached to the vertical bars of the side frames 11, for example.

[0063] The movable staircase member 4 includes the stanchions 41 that are detachably arranged on the main body 10, thereby further improving safety during use.

[0064] Furthermore, since the movable staircase member 4 is provided with stanchions 41, the ladder members 15 can be rotated upward and fixed to the stanchions 41, as shown in Fig. 12. According to this embodiment, when the movable staircase member 4 is moved, deterioration in handling caused by the ladder members 15 can be easily suppressed.

[0065] [Fifth embodiment] <Moveable staircase components> With reference to FIG. 13, a fourth modified example of the movable staircase member 1 of FIGS. 1 to 4 will be described.

[0066] The mobile stair member 5 in Figure 13 comprises a main body 10, a running mechanism 53 that supports the main body 10, and a raising unit 14 that is arranged below the main body 10. The mobile stair member 5 also comprises handles 55 (first handle 55a and second handle 55b) for facilitating running by the running mechanism 53, and outriggers 56 for preventing tipping. The main body 10 and the raising unit 14 are similar to those of the mobile stair member 1 in Figures 1 to 4, and therefore the same reference numerals are used and a description thereof will be omitted.

[0067] (Traveling mechanism) The traveling mechanism 53 has a pair of wheels 53a facing in the opposing direction of the pair of side frames 11, and a pair of legs 53b facing in the opposing direction of the pair of side frames 11. In this embodiment, the rotation axis of the pair of wheels 53a is located behind the center of gravity of the movable staircase member 5, more specifically, at the rear end of the side frame 11. In addition, the pair of legs 53b is located ahead of the center of gravity of the movable staircase member 5, more specifically, at the front end of the side frame 11.

[0068] The wheels 53a are disposed at the lower end of the support pillars 14a that constitute the raised portion 14. The diameter of the pair of wheels 53a is 30 cm or more.

[0069] The legs 53b are extendable. In the movable staircase member 5, both of the pair of legs 53b may be extendable, or only one of the legs 53b may be extendable. The pair of legs 53b are arranged at the lower ends of the supports 14a that constitute the raised portion 14. When the legs 53b are extendable, the legs 53b are configured to be extendable relative to the supports 14a. The extension range of the legs 53b can be set depending on the use of the movable staircase member 5, etc. The legs 53b can also be configured to have a sole with a rotation axis at the lower end.

[0070] (handle) The first handle 55a is disposed rearward of the rotation axis of the wheel 53a. The specific configuration of the first handle 55a is not particularly limited, and may be, for example, a rod member protruding rearward or a U-shaped member. The first handle 55a may be provided so as to be extendable and retractable in the front-rear direction, or may be provided so as to be removable. The position of the first handle 55a may be, for example, near the lower part of the rear end of the main body 10.

[0071] The first handle 55a is provided as the main handle of the movable stair member 5. The movable stair member 5 can be moved by pushing down the first handle 55a with the pair of legs 53b raised above the installation surface. The first handle 55a is usually operated by an operator. The center of gravity of the movable stair member 5 is usually located on the rear side in the front-to-rear direction. Therefore, by positioning the rotation axis of the pair of wheels 53a behind the center of gravity and by positioning the first handle 55a behind the rotation axis of the pair of wheels 53a, the movable stair member 5 can easily raise the pair of legs 53b above the installation surface and can perform the moving operation easily and reliably.

[0072] The second handle 55b is disposed at the front end of the movable staircase member 5. The specific configuration of the second handle 55b is not particularly limited, and may be, for example, a rod member that protrudes forward or a U-shaped member. The second handle 55b may be provided so as to be extendable in the front-rear direction, or may be provided so as to be removable. The position of the second handle 55b may be near the lower part of the front end of the main body 10.

[0073] The second handle 55b is provided as a sub-handle for the mobile stair member 5. The mobile stair member 5 can be moved by lifting the second handle 55b and lifting the pair of legs 53b above the installation surface. The second handle 55b is usually operated by an operator. By having the second handle 55b, the mobile stair member 5 can be easily moved even when it is difficult to secure operating space behind it. For example, by operating the second handle 55b, the mobile stair member can be easily attached vertically to the loading platform of a transport vehicle, as shown in Figure 8.

[0074] (Outrigger) The outriggers 56 are rotatably connected to, for example, the vertical bars of the side frames 11. The outriggers 56 can be rotated to a desired position when using the mobile staircase member 5. The outriggers 56 may be rotated parallel to the side frames 11 or perpendicular to the side frames 11 (i.e., protruding laterally from the side frames 11). Furthermore, the outriggers 56 may be folded, for example, onto the rear surface of the main body 10 and fixed to the main body 10 when the mobile staircase member 5 is traveling. The outriggers 56 have extendable legs 56a. When not in use, the outriggers 56 are retracted so that the legs 56a are spaced apart from the installation surface, and when in use, the legs 56a are extended and placed against the installation surface. The specific configuration of the legs 56a may be the same as the legs 53b of the mobile staircase member 5 shown in FIG. 13. The mobile staircase member 5 includes the outriggers 56, which can easily and reliably prevent tipping over. There are no particular limitations on the position or number of outriggers 56 in the movable stair member 5. For example, the movable stair member 5 may be provided with an outrigger 56 at each of the front end and the rear end, or may be provided with an outrigger 56 on each of both the front end and the rear end.

[0075] [Sixth embodiment] <Moveable staircase components> With reference to FIG. 14, a fifth modified example of the movable staircase member 1 of FIGS. 1 to 4 will be described.

[0076] The mobile stair member 6 in Figure 14 comprises a main body 60 and a running mechanism 63 that supports the main body 60. The mobile stair member 6 also comprises a first handle 55a for facilitating travel by the running mechanism 63, and outriggers 66 (a first outrigger 66a disposed at the front end of the main body 60 and a second outrigger 66b disposed at the rear end of the main body 60) for preventing tipping. The mobile stair member 6 does not comprise a raised section, and the running mechanism 63 is disposed directly on the main body 60.

[0077] (Main body) The main body 60 has a greater number of stair steps than the main body 10 in the movable stair member 1 in Fig. 1. For example, the number of stair steps in the main body 60 may be the same as the total number of stair steps in the movable stair member 1 in Fig. 1 and the number of steps in the ladder member 15. The main body 60 can have the same configuration as the main body 10 in the movable stair member 1 in Fig. 1, except for the greater number of stair steps.

[0078] (Traveling mechanism) The traveling mechanism 63 has a pair of wheels 63a facing in the opposing direction of the pair of side frames 11, and a pair of legs 63b facing in the opposing direction of the pair of side frames 11. In this embodiment, the rotation axes of the pair of wheels 63a are positioned forward of the center of gravity of the movable staircase member 6, more specifically, at the front end of the side frame 11. The pair of legs 63b are positioned behind the center of gravity of the movable staircase member 6, more specifically, at the rear end of the side frame 11.

[0079] The diameter of the pair of wheels 63a is 30 cm or more. The specific configuration of the pair of legs 63b can be the same as that of the pair of legs 53b in the movable staircase member 5 of FIG.

[0080] [Other embodiments] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is not limited to the configurations of the above-described embodiments, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0081] The configurations of the first to sixth embodiments can be used in any combination. For example, the movable staircase members of Figures 1 to 4 may be equipped with the handles and outriggers described above. The movable staircase members may also be configured without the running mechanisms described above. In this case, for example, the running mechanisms may be replaced with non-running legs.

[0082] As described above, the movable stair element can change the number of steps to k by removing the treads from the k+1th step and above and placing them on the kth step. In this case, the movable stair element may be configured to place all of the treads from the k+1th step and above on the kth step, or may be configured to place some of the treads from the k+1th step and above on steps other than the kth step.

[0083] As described above, in the standard state where multiple treads are arranged on n steps, it is preferable that the number of treads on each of the (n-1)th and subsequent steps be one. However, the movable staircase member can also be configured to have two or more treads on a specific step, such as the lowest step. This configuration may improve the efficiency of work on a specific step.

[0084] When the traveling mechanism has a pair of wheels facing each other in the direction in which the side frames face each other, the diameter of the pair of wheels can be less than 30 cm. For example, casters can be used instead of wheels with a diameter of 30 cm or more. Using casters facilitates the compactness of the entire mobile staircase member. Furthermore, the traveling mechanism may have additional wheels, legs, etc. in addition to the configuration of the above-described embodiment. For example, the mobile staircase member may have legs near the wheels. Furthermore, when the traveling mechanism has a pair of wheels facing each other in the direction in which the side frames face each other, the closer these wheels are positioned to the center of gravity of the mobile staircase member, the smaller the lifting weight (the load of pushing down or up the handle) during movement can be. However, with this configuration, there is a risk that the wheels may move when stopped. Therefore, measures such as using wheel stoppers or outriggers, extending one or more optional legs to slightly raise the wheels above the installation surface, or securing the mobile staircase member to a transport vehicle or the like may be more effective.

[0085] The travel mechanism may be configured so that the length of the legs is shorter than the installation surface. In this case, distance pieces may be placed between the legs and the installation surface to fill the gap between them when the mobile staircase member is stopped.

[0086] In the above embodiment, the mobile stair member is mainly used for a transport vehicle. However, the use of the mobile stair member is not limited to this. For example, the mobile stair member can also be used in farm fields. In this case, if the diameter of the wheels is 30 cm or more, the ease of travel is significantly improved. [Explanation of symbols]

[0087] 1, 2, 3, 4, 5, 6 Movable staircase members 10, 60 main body 11 Side frame 12 Tread 13, 53, 63 Traveling mechanism 13a Front wheel 13b rear wheel 14 Raised part 14a Post 14b Side frame 14c front frame 14d rear frame 15 Ladder members 15a Rotation axis 15b sole 20 Tilt holder 20a body 20b Bottom plate part 20c Side plate part 20d connecting piece 21 Fixed part 21a cleats 22 Connector 41 Stanchion 42 Rope 53a, 63a wheels 53b Legs 55 Handle 55a First Handle 55b Second handle 56, 66 Outrigger 56a, 63b Legs 66a No. 1 Outrigger 66b No. 2 Outrigger A. Tilt H Distance between adjacent horizontal bars M string member L Length of the footboard in the front-to-rear direction R connecting road S: Step height of one ladder member when in use W Tread width

Claims

1. A main body having a pair of side frames facing each other and a plurality of step plates that can be arranged in a staircase pattern of n steps (n is an integer of 2 or more) between the pair of side frames, The number of steps in the staircase can be changed to k by removing the k+1st step (where k is an integer between 1 and n-1) or higher step and placing it on the kth step. Movable staircase components.

2. A movable staircase member as described in claim 1, wherein one or more step boards located on the topmost step extend in the depth direction from the ascending / descending side of the stairs between the pair of side frames, and a connecting passage is formed from the depth end that can connect to the outside.

3. A movable stair member as described in claim 1 or claim 2, wherein in a standard state in which the plurality of treads are arranged in n steps, the number of treads on each of the steps from the n-1th step onwards is one.

4. Further provided is a raised portion disposed below the main body, 3. The movable staircase member according to claim 1, wherein the raising portion has a ladder member that can communicate with the step board arranged at the lowest step of the main body.

5. Further provided is a traveling mechanism that supports the main body, the traveling mechanism has a pair of wheels facing each other in the opposing direction of the pair of side frames, 3. The movable staircase member according to claim 1, wherein the diameter of the pair of wheels is 30 cm or more.

6. A movable stair member as described in claim 1 or claim 2, further comprising at least one of a gate holding portion that holds the gate of the loading platform of the transport vehicle parallel to the bottom surface of the loading platform, and a gangway that can be hung across the loading platform of the transport vehicle.

7. 3. The mobile staircase member according to claim 1, further comprising a fixing portion that can fix the main body to a loading platform of a transport vehicle using a string member.

8. The movable staircase member according to claim 1 or 2, further comprising a stanchion that is detachably disposed on the main body.

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