JP2002339563A - Stair for scaffolding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stairs for a scaffolding capable of ensuring a horizontal tread at all times even in the case of a wide or narrow space between a mounting surface and a horizontal member as the place of engagement. SOLUTION: The stairs for the scaffolding are composed of upper-side supporting materials 1 extended in an oblique lower section under the state in which the supporting materials are engaged with a handrail by hooks 20, lower-side supporting materials 13 disposed in parallel with upper-side supporting materials 11 at lower places opposed to the upper-side supporting materials 11, leg sections 17 rotatably supported at the lower end sections of both supporting materials 11 and 13 and a plurality of steps 15 parallel with the leg sections 17. Even when angles to the mounting surfaces for both supporting materials are changed with the variation of the spaces among the horizontal members and the mounting surfaces under the state in which the leg sections are secured on the mounting surfaces by parallel crank mechanisms constituted of both supporting materials 11 and 13, the leg sections 17 and the steps 15, the angles of inclination of the steps are held in parallel at all times to the leg sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scaffold stair used at a construction site or the like.

[0002]

2. Description of the Related Art Generally, at a construction site or the like, a scaffold is built around a building with a support, a handrail, and a scaffold plate (in some cases, a brace), and the outside work is particularly performed using the scaffold. A scaffold stair 50 as shown in FIGS. 9 to 11 is attached to the scaffold for ease of getting on the scaffold and for carrying in the material. A certain portion (for example, traffic between a ground portion and a scaffold plate on the first floor portion, or traffic between scaffold plates on upper and lower floors) is performed. The stairs 50 for scaffolding are composed of left and right support members 51 and a step 52
A hook 53 is formed at the upper end of the support member 51, and a base plate 54 is rotatably mounted at the lower end of the support member 51. And the handrail G of the scaffold
The hook 53 is hooked on the base plate 54 and the base plate 54 is placed on the installation surface.

[0003]

However, the position of the handrail G on which the hook 53 of the scaffold stair 50 is actually hooked is not always at a fixed height. for that reason,
If the handrail G is just the right height as shown in FIG. 9, the tread surface 52a of the step 52 is arranged parallel to the installation surface, that is, horizontally, but depending on the height, the tread surface 52a is horizontal as shown in FIG. In some cases, it could not be used as a staircase. For this reason, conventionally, it was necessary to prepare multiple types of scaffold stairs according to the height of the handrail, but in reality, due to the cost and the inconvenience of transporting and storing the stairs, it was quite difficult to prepare multiple types of scaffolds. The use of scaffolding stairs was virtually restricted, not being able to provide stairs. The present invention has been made to solve the above problems. An object of the present invention is to provide a scaffold stair that can always secure a horizontal tread surface even if there is a large or small gap between a mounting surface and a horizontal member serving as an engagement position.

[0004]

Means for Solving the Problems In order to achieve the above object, according to the first aspect of the present invention, a mounting member is installed between a horizontal member such as a handrail of a scaffold installed on a construction site and an installation surface. An upper support member having an engaging portion that engages with the horizontal member and extending diagonally downward with the engaging portion engaged with the horizontal member; A lower supporting member disposed in parallel with the upper supporting member at a lower position facing the side supporting member; and a plurality of parallel steps rotatably supported by the both supporting members. In a state where the two support members are installed on the same installation surface by a parallel crank mechanism constituted by the two support members and a plurality of steps, the two support members are changed with a change in the distance between the horizontal member and the installation surface. Even if the angle to the same installation surface is changed, the inclination angle of the same step The point is that the holding material is always kept parallel to the installation surface. In the above configuration, a parallel crank mechanism configured by both support members and a plurality of steps is configured. Here, it is assumed that one support step is considered as a fixed link installed on the installation surface, and both support members are rotated about this step. Rotating the two support members about the fixed link (step) means changing the angle between the two support members and the installation surface according to the horizontal members having different heights. If the engaging portion is engaged with the lower horizontal member, the angle becomes narrower (that is, the two support members are inclined in the direction in which they are laid down). On the other hand, if the engaging portion is engaged with the horizontal member at a higher position, the angle becomes wider (that is, the supporting member is inclined in the direction in which both supporting members stand).
However, within the range in which both support members are rotated in a predetermined manner in accordance with the horizontal members having various heights, the restriction of the parallel crank mechanism operates, and the inclination angle of the step is always kept parallel to the step as the fixed link. . Here, the term "parallel" means that both support members as a link constituting the parallel crank mechanism, and a line connecting a pair of pins and the like connecting the steps are parallel to each other. It doesn't matter. The inclination angle of the step is also based on the line segment connecting the pivoted pair evenly supported.

According to the second aspect of the present invention, in a stair for a scaffold mounted between a horizontal member such as a handrail of a scaffold installed on a construction site and an installation surface, a member engaged with the horizontal member is provided. An upper support member that is formed obliquely downward with the joint portion formed and the engaging portion engaged with the horizontal member, and a lower position facing the upper support member and parallel to the upper support member at a lower position facing the upper support member And a lower support member disposed on a horizontal installation surface located below the horizontal member and a rotatable shaft at a lower end of the both support members with respect to the both support members. A supporting leg, and a step facing the leg and rotatably supported by the two supporting members, comprising the supporting member, the leg, and the step. When the legs are installed on the installation surface by the parallel crank mechanism, the distance between the horizontal member and the installation surface changes. As its gist that always to be held parallel to the inclined angle Doashi part of even the steps as changing the angle with respect to the installation surface of the two support members along with. In the above configuration, a parallel crank mechanism constituted by both support members, legs, and steps is configured. Here, it is assumed that both supporting members are rotated about the legs, considering the legs as fixed links installed on the installation surface. Rotating the support members about the leg means changing the angle between the support members and the installation surface in accordance with the horizontal members having different heights. If the engaging portion is engaged with the lower horizontal member, the angle becomes narrower (that is, the two support members are inclined in the direction in which they are laid down).
On the other hand, if the engaging portion is engaged with the horizontal member at a higher position, the angle becomes wider (that is, the supporting member is inclined in the direction in which both supporting members stand). However, in the range where both support members are rotated in a predetermined manner in accordance with the horizontal members having various heights, the restriction of the parallel crank mechanism works, and the inclination angle of the step is always held parallel to the leg portion as the fixed link. You. Here, the term "parallel" means that both support members as links constituting the parallel crank mechanism, a line connecting the pair of pins and the like connecting the legs and the steps are parallel, and the two support members and the leg portions are parallel. And the appearance of the steps. The inclination angle of the step is also based on the line segment connecting the pivoted pair evenly supported.

[0006] Consider a case where a load is applied to the steps having the above constructions (that is, they are used as a staircase). Here, the case of claim 2 will be described as a representative. Here, as shown in FIGS. 12A and 12B, if an engaging portion is formed not on the upper supporting material but on the lower supporting material, the engaging portion is engaged with a handrail as a horizontal member. Think about it. Here, if the load on the step is excessively applied to the upper support member side, the parallel crank mechanism may be deformed as shown in FIG. This is because the angle between the lower support and the leg is an obtuse angle, and the load causes a vector to slide the leg outward (in the direction of the arrow). This is because slides are allowed. In this case, there is a possibility that the steps are folded, and the steps are not suitable for use as stairs as if the steps were actually folded. However, in the configuration of the present invention, since the upper support member side is engaged with the handrail, the two support members cannot rotate in a direction to deform the parallel crank mechanism. This is because a vector for sliding the leg outward is not released because the upper support is regulated by the engaging portion. Therefore, the steps are not folded and the parallelism is maintained. Further, in order to achieve the above object, a third aspect is provided.
In the invention described in (1), legs are formed at the lower ends of the upper and lower support members, and the leg portions are pivotally supported so as to be tiltable with respect to each support member, and the back surface is directly opposed to the installation surface and abuts. Made it possible.
With this configuration, in the invention of claim 1, the upper and lower support members are installed on the installation surface via the legs, and since the legs are tilted, the back surface thereof is on the installation surface regardless of the inclination of the upper and lower support members. It is abutted directly. Further, in order to achieve the above object, the invention according to claim 2 is configured such that, in addition to the configuration of the invention according to claim 1, the upper support is turned toward the lower support near the upper portion. The gist is that a bent portion is formed, and the engaging portion is formed near the front end of the bent portion. With this configuration, the stairs for scaffolding are disposed at positions entirely separated from the horizontal members outward as compared with the case where no bent portion is formed, and the step is positioned at the lower side of the horizontal members. Can be prevented. The bent portion is formed by bending or bending the upper support.

[0007]

According to the scaffold stairs according to the first aspect of the present invention, even if the engaging position of the engaging portion is changed, each step is always kept parallel, so that the stairs can be mounted on various horizontal members having different heights. The stairs can be used by being engaged, and the range of use is expanded as compared with the conventional scaffold stairs. In the scaffold staircase according to the second aspect of the present invention, even if the engaging position of the engaging portion is changed, the step is always kept parallel to the leg portion. The range of use can be expanded as compared with conventional scaffold stairs. According to the third aspect of the invention, in addition to the effects of the first aspect, the lower ends of the upper and lower support members abut not on the installation surface but directly with the legs, and the legs tilt according to the angle. Therefore, it will be firmly supported. According to the fourth aspect of the present invention, in addition to the effects of any one of the first to third aspects, the step can be prevented from being arranged at a lower position of the horizontal member, so that the horizontal member obstructs the vertical movement. It is possible to provide a scaffold stair that can be configured so as not to be stuck and that is easy to use.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a scaffold stair according to an embodiment of the present invention will be described with reference to the drawings. still,
In this embodiment, left means the left direction in FIG. 3, and right means the right direction in FIG. The term “up and down” refers to the up and down direction in a state where the scaffold stairs are installed. As shown in FIGS. 1 to 4, the scaffold stairs have upper support members 11 disposed on the left and right, and lower support members 13 disposed on the left and right such that they are parallel to the upper support members 11. And both support members 11, 1
Three (plural) steps 15 mounted between the three supporting members 1 and both supporting members 1 so as to be parallel to the steps 15
A parallel crank mechanism, which is a basic structure, is constituted by the legs 17 attached to the lower ends of the first and the first 13. Hereinafter, these components will be described in detail. The pair of left and right upper support members 11 is formed of a long plate made of an aluminum alloy. Near the upper end of the upper support 11 is the lower support 1
Curved portion 1 as a bent portion formed by bending in three directions
9 is set. A hook 20 is formed at the tip of the curved portion 19. As shown in FIG. 6, the hook 20 as an engaging portion is formed in a hook-like curved shape for engaging with the handrail G. A lock piece 21 is attached to the hook 20 so as not to come off while being engaged with the handrail G. Two long holes 24 are formed in the lock piece 21, and pins 22 protruding at two predetermined positions on the base of the hook 20 are loosely fitted in the two long holes 24 of the lock piece 21. . As a result, the lock piece 21 is slidable between a lock position indicated by a solid line and a release position indicated by a virtual line in FIG. The pair of left and right lower support members 13 are also formed of a long plate made of an aluminum alloy. As shown in FIGS. 1, 2, and 3, the lower support member 13 is always disposed below the upper support member 11 in the use state of the staircase.

The left upper support member 11 and the lower support member 13
The left leg 17 is attached to the lower end of the right support member 11 and the right leg 18 at the lower end of the right upper support member 11 and the lower support member 13.
The left and right legs 17, 18 are formed by bending a plate made of aluminum alloy into a channel shape in cross section, and are rotatable by pins 25 with respect to the side support member 11 and the lower support member 13, respectively. It is pivoted. Above the legs 17, 18 and between the left and right upper support members 11 and lower support members 13,
Steps 15 are mounted. Each of the steps 15 is rotatably supported by pins 27 on the left and right upper support members 11 and the lower support member 13. As shown in FIG. 3, the step 15 is a box-shaped aluminum alloy member having a lower surface opened. Step 15 of Step 15
a is formed with a non-slip groove 28. Tread surface 15
An angle material 29 for reinforcement is fixed to the back surface side of a.

Here, the upper supporting member 11 and the lower supporting member 13
Are parallel to each other. In addition, a line segment connecting the pins 25 supported by the upper support member 11 and the lower support member 13 of each of the legs 17 and 18 is represented by P. In addition, a line segment connecting the pins 27 supported by the upper support member 11 and the lower support member 13 in each step 15 is defined as Q. At this time, this line segment P
And the line segment Q are parallel. That is, the upper support 1
1, the lower support 13, the legs 17, 18 and the step 15 constitute a parallel crank mechanism.

Next, the scaffold stairs configured as described above will be described together with the operation of the parallel crank mechanism. FIG.
As shown in (1), the hook 20 of the upper support member 11 is engaged with the handrail G as a horizontal member, and the left and right legs 17, 18 are installed on the horizontal ground E as an installation surface. At this time, the line segment P and the ground E are arranged in parallel. The line segment P (line segment Q) is parallel to the tread surface 15a and the contact surfaces 17a, 18a of the legs 17, 18 with the ground E, respectively. Ground E
And the distance between the handrail G and M. The distance M is an element that varies depending on the position of the handrail G. FIG. 7 shows a principle diagram of the parallel crank mechanism in the state of FIG. Upper support 11
Is the link L1, the lower support 13 is the link L2, and the leg 17
Corresponds to link L3, and step 15 corresponds to link L4.
The pin 25 corresponds to the pair O1 and the pin 27 corresponds to the pair O2. The two legs 17 and 18 correspond to fixed links in a parallel crank mechanism. A case is considered in which the fixed links are fixed and are turned around the links L1 and L2 and about the pair O1 as the center of rotation. At this time, in the parallel crank mechanism, the link L4 parallel to the link L1 which is a fixed link is always kept parallel to the link L1 regardless of the phases of the links L1 and L2. If this is reflected in FIG. 3 again, the operation of engaging the hook 20 of the upper support member 11 with the handrail G and installing the left and right legs 17, 18 on the ground E as the installation surface is straightforward. This is the same as turning around the link L1 and the link L2 and using the pair O1 as the center of rotation. Since "the link L4 parallel to the link L1 is always held parallel to the link L1 regardless of the phases of the link L1 and the link L2", the point is that the height of the handrail G changes and the distance M Is changed, the line segments P and Q are the distance M between the ground E and the handrail G
It is understood that they are always parallel regardless of That is, regardless of the height of the handrail G, the tread surface 1 of step 15
5a is always kept horizontal.

The hook 20 is formed on the upper support 11 side. As shown in FIGS. 11A and 11B, an engaging portion such as a hook 20 is formed on the lower supporting member instead of the upper supporting member, and the engaging portion is engaged with a handrail as a horizontal member. Think about it. In this case, if the load on the step is excessively applied to the upper support, the parallel crank mechanism may be deformed as shown in FIG. 11B. This is because the angle between the lower support and the leg is an obtuse angle, and the load causes a vector to slide the leg outward (in the direction of the arrow). This is because slides are allowed. This can cause the steps to collapse when loaded (ie, used). If the steps are actually folded, they are not suitable for use as stairs. However, since the upper support 11 is engaged with the handrail G in this manner, the upper support 11 and the lower support 13 cannot rotate in a direction that deforms the parallel crank mechanism. This is because the upper support member 11 is regulated by the hook 20 engaging portion,
This is because the vector that slides 18 outward is not released. Therefore, step 15 is not folded and the parallelism is maintained even if a load is applied.

The upper support member 11 is engaged with a handrail G via a curved portion 19 as shown in FIGS.
At this time, the straight upper support member 11 without the curved portion 19 is provided.
If the hook 20 is formed at the upper end of the
Is shifted toward the handrail G as a whole, and the uppermost step 15 is disposed immediately below the handrail G. This is the tread surface 15 of the top step 15
It becomes difficult to step on a. However, in the present embodiment, since the bending portion 19 is provided and the step 15 is arranged at a position separated from the handrail G, such a problem does not occur. As shown in FIG. 5, when the stairs for scaffolding are detached from the handrail G, the upper supporting member 11 and the lower supporting member 13 are brought close to each other (that is, the link L1 and the link L2 in FIG. (Pivot to the phase position closest to each other).

With this configuration, the scaffold staircase of the present embodiment has the following effects. (1) Even if the hooks 20 are engaged with the handrails G of different heights, the tread surface 15a of the step 15 is always kept parallel to the legs, so that the stairs for scaffolds of the present embodiment have various heights. It can be used for different handrails G, and the range of use can be expanded as compared with conventional scaffold stairs. (2) Even if a load is applied to step 15 since step 15 is engaged by hook 20 on upper support member 11 side, step 1
5 is not folded and can be used safely. (3) In the present embodiment, the bending portion 19 is provided, and the step 15 is arranged at a position separated from the handrail G. Therefore, the uppermost step 15 is not disposed immediately below the handrail G, and there is no problem in use. (4) When not in use, it can be folded neatly by the parallel crank mechanism, so that it can be stored without being bulky.

The present invention is not limited to the above-described embodiment, but can be embodied with the following modifications. The upper and lower support members 11 and 13 need not be connected by the legs 17 as in the above embodiment. The point is that a parallel crank mechanism may be configured and engaged with the horizontal member on the upper support member side. For example, as shown in FIG. 8, a base plate 31 as a leg may be attached to each of the support members 11 and 13. Even in such a configuration, a plurality of steps 1
5 constitutes a parallel crank mechanism between the upper and lower supporting members 11 and 13. The base plate 31 is pivotally supported by a rotating shaft 32. Since the base plate 31 can be tilted, its back surface regardless of the angle of the support members 11, 13 with respect to the ground E is firmly opposed to the ground E. Will be retained.
In the above embodiment, the step 15 and the leg portion 17 can constitute a parallel crank mechanism. Therefore, theoretically, only one step 15 may be used. However, in the embodiment shown in FIG. 8, a plurality of steps 15 are required. . In the above embodiment, the upper support 11 and the lower support 13 are disposed on the left and right sides to support the uppermost step 15. The upper support 11 and the lower support 13 may be arranged only at the center. The point is that the parallelism between the step 15 and the leg 17 is ensured by the parallel crank mechanism.・ The bending portion 19 as a bent portion is essentially a step 15
The function is not limited to such a shape as long as the function is to separate the handrail G from the handrail G. -The curved portion 19 may be omitted. -The shape of the upper support member 11, the lower support member 13, and the step 15 is not limited to the above embodiment. In addition, the present invention employs aspects such as changing the material, attaching a non-slip to the back surface of the leg portion 17, attaching a binding belt so as not to open in a folded state, changing the shape of the hook 20, and the like. It is free to change and implement.

[0016]

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a state in which a scaffold stair according to an embodiment of the present invention is attached to a scaffold.

FIG. 2 is a front view of the scaffold staircase of the same embodiment.

FIG. 3 is a side view of the scaffold staircase cut along the line AA in FIG. 2;

FIG. 4 is a side view of the scaffold staircase of the same embodiment.

FIG. 5 is a side view of the scaffold stairs of the same embodiment in a folded state.

FIG. 6 is an enlarged side view of the hook.

FIG. 7 is a principle view illustrating a parallel crank mechanism according to the same embodiment.

FIG. 8 is a side view of a scaffold stair according to another embodiment.

FIG. 9 is a perspective view of a conventional scaffold stair.

FIG. 10 is a side view of a conventional scaffold stair.

FIG. 11 is a side view of a conventional scaffold staircase.

12A and 12B are explanatory diagrams illustrating an operation when an engaging portion is formed on the lower support member side, wherein FIG. 12A is a state where no load is applied, and FIG. 12B is a state where a load is applied. FIG. 4 is an explanatory diagram for explaining insertion into a second elliptical through hole.

[Explanation of symbols]

11 upper support member, 13 lower support member, 15 steps, 17 legs, 31 base plate as legs, G railing.

Claims (4)

[Claims] 1. A stair for a scaffold mounted between an installation surface and a cross member such as a handrail of a scaffold installed on a construction site, wherein an engaging portion for engaging with the cross member is formed. An upper supporting member extending obliquely downward with the engaging portion engaged with the horizontal member; and a lower side disposed in parallel with the upper supporting member at a lower position opposed to the upper supporting member. A supporting member, and a plurality of steps parallel to each other rotatably supported by the both supporting members. The both supporting members are formed by a parallel crank mechanism constituted by the both supporting members and the plurality of steps. Even if the angle of the support members with respect to the installation surface is changed in accordance with a change in the distance between the horizontal member and the installation surface in the state where the support members are installed on the same installation surface, the inclination angle of the same step is the same. Is always kept parallel to the installation surface. Scaffolding for the stairs. 2. A scaffold staircase mounted between a horizontal member such as a handrail of a scaffold installed on a building site and an installation surface, wherein an engaging portion engaging with the horizontal member is formed. An upper supporting member extending obliquely downward with the engaging portion engaged with the horizontal member; and a lower side disposed in parallel with the upper supporting member at a lower position opposed to the upper supporting member. Supporting material, and a leg that is installed on a horizontal installation surface that is located below the horizontal member and that is rotatably supported at the lower ends of the two supporting materials so as to be rotatable with respect to the two supporting materials, A step facing the same leg and rotatably supported by the two supporting members; and a parallel crank mechanism constituted by the two supporting members, the legs and the step. In the state where is installed on the same installation surface, with the fluctuation of the distance between the horizontal member and the installation surface, Scaffolding stairway even changing the angle inclination angle of the step, characterized in that it has to be always held parallel to relative Doashi unit for installation surface. 3. A leg is formed at a lower end of each of the upper and lower supporting members, and the legs are pivotally supported so as to be tiltable with respect to each of the supporting members, and a back surface of the leg can be abutted against an installation surface. The scaffold stair according to claim 1, wherein: 4. A bent portion formed by turning the upper supporting member toward the lower supporting member, and the engaging portion is formed near a tip of the bent portion. The staircase for scaffolding according to any one of claims 1 to 3, characterized in that: