JPS5829752Y2 - Stepladder for stair scaffolding - Google Patents

Description

[Detailed description of the invention] This invention can be used as a regular stepladder on a flat floor, and when finishing work on the upper part of a wall or the back of a staircase in a staircase, it can be used with one leg horizontally on the upper staircase surface. In addition, to provide a stepladder which can be used as a stair scaffold with the other leg stably supported on the lower stair surface.

Generally, finishing work on staircases is carried out using temporary scaffolding made of single pipes, but the following inconveniences arise due to scaffolding, which poses a major problem in construction planning.

■ Not only does the cost of materials for temporary scaffolding increase, but it also requires a great deal of effort and expense for temporary construction and dismantling.

■ Scaffolding obstructs access through the stairway.

■ During dismantling, the finished surface is easily damaged by scaffolding materials, etc.

■ It is difficult to unload long scaffolding boards after dismantling them.

Additionally, in some cases, stepladders are used instead of scaffolding, but since the surface on which they are installed is stairs, they are unstable and pose safety management problems.

The present invention is a rational solution to such problems.

The embodiment of the present invention will be described based on the drawings as follows: 1.1'
The outer cylinders 1a and 1a' have a plurality of steps of tread plates 2..., 2'..., and the inner cylinder 1b is slidably inserted into the outer cylinders 1a and 1a' only in the longitudinal direction. lb', and bottle holes 3..., 3', bored in the outer cylinders 1a, 1a'.
...and pins 4, 4' that can be selectively inserted into these
It is a pair of legs that are telescopically taken over by the.

Both legs 1 and 1' are pivotally connected around a horizontal axis 6 so as to be able to swing open and close, and the first state in which both legs 1 and 1' form an acute angle (the state in which they are used as a normal stepladder) is 90°. It is fixedly usable in a second state (a state in which it is used as a stair scaffold) that forms a slightly larger angle.

That is, a horizontal upper plate 5 is integrally fixed to the upper end of the outer cylinder 1a' of the leg 1', and a reinforcing plate 7 that connects both 1a' and 5 is provided with a reinforcing plate 7 that pivots the leg 1 through the horizontal shaft 6. It is a support.

In addition, two pin holes 8a and 8b are drilled in the reinforcing plate 7 at positions on an arc centered on the horizontal axis 6, and a corresponding pin hole is drilled in the outer cylinder 1a of the leg 1. When using it as a normal stepladder, fold the leg 1 around the horizontal axis 6 as shown by the imaginary line, and connect one bottle hole 8a and the outer cylinder 1.
Either insert the pin across the bottle hole of a, or insert the pin into the outer cylinder 1a,
The opening stopper 13 is screwed between 1a', or both can be done to fix the entire structure at an acute angle.

When used as a stair scaffold, as shown by the solid line, the leg 1 is opened by 90 degrees or more, and a pin is inserted between the other pin hole 8b and the pin hole of the outer cylinder 1a, so that the entire structure is fixed in a substantially F shape. Therefore, one leg 1 can be held horizontally and supported on the upper stair surface a, and the other leg 1' can be supported on the lower stair surface a.
By expanding and contracting ', the horizontality of the one leg 1 can be adjusted.

Reference numeral 11 denotes a scaffolding board that is detachably attached to one leg 1 with bolts 12, bends, etc., and is configured so that the finishing work of the staircase can be carried out by riding on this scaffolding board 11.

At the tips of both legs 1, 1', that is, at the tips of each inner cylinder 1b, lb', there is a non-slip device (this may be made of metal, but
In order to prevent damage to the staircase surface, it is desirable to form the core metal with rubber covering it.

) 9.9' is pivotally mounted around a pin 10.10' parallel to the horizontal axis 6 so as to be able to rotate over approximately 90 degrees, and when used as a normal stepladder, both non-slip devices 9, 9' When stably grounded on the same plane and used as a stair scaffold, by rotating the non-slip device 9 on the horizontal leg 1 side approximately 9 degrees, both non-slip devices 9, 9' can be used as a stair scaffold. It is configured to be stably grounded on surfaces a and l).

Although the legs 1, 1', the upper plate 5, the reinforcing plate 7, etc. are made of lightweight metal such as aluminum, they may be made of other suitable materials.

As described above, the stepladder for stair scaffolding according to the present invention can not only be used as a normal stepladder, but also can be used to fix both legs 1 and 1' in the second state during finishing work on a staircase.
By appropriately expanding and contracting the legs 1 and 1' according to the conditions of the stairway, one leg 1 is made horizontal, and the anti-slip device 9 is rotated approximately 9° to raise the upper stair surface a. By stably grounding the non-slip device 9' of the other leg 1' on the lower staircase surface, the scaffolding board 11 is supported horizontally and stably, so that workers can work while riding on the scaffolding board 11. By adding a simple configuration to the stepladder, you can
This enabled us to completely eliminate the drawbacks of the conventional technology mentioned at the beginning.

[Brief explanation of the drawing]

The drawing is a perspective view illustrating an embodiment of a stepladder that also serves as a stair scaffolding according to the present invention. 1.1'...Leg, 6...Horizontal axis, 9,9
'...Curved anti-slip tool, 10゜10'...Pin, 1
1...Scaffolding board, a, l)...Four staircase surfaces.

Claims (1)

[Scope of utility model registration request] A plurality of steps 2, 2' are installed, and a pair of legs 1, 1', which are telescopically taken over, are pivotally connected to each other so as to be able to swing open and close around a horizontal shaft 6, and both legs 1, 1' The legs 1 and 1' are fixedly fixed in a first state in which they form an acute angle and in a second state in which they form an angle slightly larger than 90°, and anti-slip devices 9,
9' is approximately 90 around the pin 10 and 10' parallel to the horizontal axis.
The scaffolding plate 1 is pivotably mounted on one leg 1.
A stepladder for use as a stair scaffold, characterized in that 1 is detachably attached.