JPH08291678A - Folding staircase - Google Patents

Abstract

PURPOSE: To prevent fingers or clothes from being caught by pivoting at least two stage foldable steps on a pair of supports through brackets, and forming gaps between the supports and steps when a staircase is folded in the direction of the width. CONSTITUTION: Step sections capable of being folded in one way only are pivoted on supports 1 and 2 on both sides of a folding staircase used by hanging on one box car, etc., through brackets 3a and 3b in a turnable manner. Cut sections 14 are provided in the step sections of both up and down steps and, at the same time, they are linked with a joint bar 4. After it is used, and when the staircase is folded in the direction of the width, the step sections are pulled upward and are folded and, at the same time, the supports 1 and 2 on both sides are pulled near. In that case, gaps 13 are formed between the supports 1 and 2 and step sections, gaps 15 are formed between both right and left step sections, and fingers, clothes, etc., are protected from being caught. By the constitution, safety can be promoted with a simple construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile such as a bus and a one-box car, and a folding staircase that is used by leaning against a wall of a house.

[0002]

2. Description of the Related Art A ladder that can be folded during storage or transportation has been conventionally considered. For example, the one shown in FIG. 9 has left and right steps 94 and 9 which are rotatably mounted by connecting rods 93 between the left and right columns 91 and 92.
It is a ladder composed of 5.

As shown by the arrow, the ladder can be folded by moving the connecting rod upward from the open state, and finally, in the two columns 91 and 92,
By taking in all the steps 94 and 95 and the connecting rod 93, it is possible to make the columns 91 and 92 substantially integrated during storage and transportation. Such a foldable ladder is known as, for example, "Nikkei Pole Ladder" manufactured by Nippon Light Metal Co., Ltd.

[0004]

However, in such a folding ladder, the compactness at the time of folding is considered to be too important, and when the folding ladder is folded, fingers are caught between the columns 91 and 92 and the steps 94 and 95. Also, step 9
Widths of the columns 4 and 95 in the direction perpendicular to the paper surface direction are the columns 91 and 92.
Since it is designed to be narrower than the width of the
There was a safety defect that the workers on 4, 95 could not work stably.

Therefore, an object of the present invention is not a ladder having a narrow step, but a step having a step having a width sufficient to be recognized as a staircase, and a risk of pinching a finger during folding is small. To provide a staircase.

Another object of the present invention is to provide a folding staircase which can be leaned against a wide-width object such as a large-sized bus so that a plurality of workers can climb in parallel at the same time.

[0007]

The folding staircase of the present invention is provided with at least first and second support columns leaning parallel to an object and fixed to the first and second support columns, respectively. At least the upper step supporting part and the lower step supporting part, at least the upper step connecting part and the lower step connecting part connected via a connecting rod, and both end parts between these step supporting part and the connecting part. In the supporting part and the connecting part, there is a rotatably provided step part, and the first and second columns are in one direction parallel to the column, and the connecting rod is in a direction opposite to the one direction. It is possible to fold the first and second columns and the connecting rod so as to be adjacent to each other by moving the first and second columns, and in the folded state, between the step portion and the first and second columns. There is a predetermined gap between The upper and lower step support portion is configured to be.

Further, in the present invention, the step portion has a horizontal portion and a vertical portion, and is rotatably attached to the step support portion and the step connecting portion at both ends of the vertical portion, the horizontal portion being the first portion. It has a width sufficiently wider than that of the first and second columns, and in the folded state, a predetermined gap is provided between the adjacent vertical portions.

Further, in the present invention, at least four columns are provided, and similar step portions are provided between them.

[0010]

With such a structure, it is possible to provide a predetermined gap between the left and right columns, which are parallel and close to each other in the folded state, and the step portion, to the extent that fingers and clothes can be inserted. The safety can be significantly improved.

Further, since the width of the horizontal portion of the step portion is made sufficiently wider than that of the supporting column, the operator feels as if he is climbing on a stable stairs rather than climbing on an unstable ladder. It can be safely carried out even under heavy work.

Further, in the folding staircase of the present invention, at least four columns are provided, and the step portions similar to the above are provided between them, so that a plurality of workers can lean against a bus having a wide width at the same time. You can climb the stairs and perform work such as cleaning and repairs, the width is wide enough, safety is higher than that of ladders, and you do not have to pinch your fingers or clothes when folding it It is highly practical because it can be folded when moving or moving.

[0013]

1 is a schematic perspective view of a folding staircase according to an embodiment of the present invention. In this example, it is leaning against a tall one-box car. An upper step supporting portion 3a and a lower step supporting portion 3b are fixedly provided on the two columns 1 and 2, respectively, and upper and lower step connecting portions 5a and 5b connected by a connecting rod 4 and upper and lower step connecting portions 5a and 5b. Left side step portions 6a, 7a and right side step portions 6b, 7b having a horizontal portion and a vertical portion bent in a dogleg shape between the step supporting portions 3a, 3b are rotatable at both ends thereof. It is installed in the state.

The upper ends 8 of the two columns 1 and 2 are approximately 105
It is bent at an angle of degrees, and a conical leaning upper part 9 made of a material such as rubber or resin is attached to the tip thereof. The leaning part 9 is, for example, a suction cup. Further, a leaning lower part 10 made of the same material is attached to the lower ends of the columns 1 and 2.

2, 3 and 4 are plan views of the above embodiment,
The figures show an open state, a state in the middle of folding, and a folded state, respectively. Each component is given the same number as in FIG. 1 to facilitate understanding.

First, as shown in FIG. 2 (a), when the stairs are open, the upper left and right step portions 6a and 6b are located substantially in a straight line between the columns 1 and 2. . The same applies to the lower left and right step portions 7a and 7b.

These step portions are rivets 11 provided at the ends of the L-shaped step support portions 3a and 3b and at a fixed distance from the columns 1 and 2.
The one end is rotatably fixed. In addition, the opposite end has a step connecting portion 5 connected by a connecting rod 4.
It is rotatably fixed by rivets 12 provided on a and 5b.

In the circle indicated by the broken line in FIG. 2 (b),
It is shown as viewed from the side surface of the column 1 and the step portion 6a. The tip 8 of the column 1 is bent at an angle of about 105 degrees, and a leaning upper portion 9 made of rubber or resin is provided at the tip thereof. Therefore, when leaning the stairs, the worker tends to lean against the ground at an angle of about 75 degrees, and can lean at a safe angle.

Further, since the horizontal portion 6ah of the step portion has a width sufficiently wider than the width of the supporting column 1, the worker can stand on the step portion in a stable manner, rather than a ladder. You can use it with the same feeling.

Also, by making the width sufficiently wide, sufficient strength can be maintained even if the left and right lengths of the step portion itself are lengthened to some extent, and the space between the columns 1 and 2 can be widened accordingly. It can be prevented from falling due to rolling when leaning against it. The horizontal portion 6ah may be bent in the opposite direction as indicated by the broken line.

Next, as shown in FIG. 3, the left and right columns 1, 2 are closed by moving the left and right columns 1, 2 downward and the connecting rod 4 upward. .
Each of the vertical portions of the L-shaped step support portions 3a and 3b is cut into a shape having a certain curvature on the column side.

Further, both sides of the step connecting portions 5a, 5b, and also the portions of the vertical portions 6av, 6bv, 7av, 7bv of the step portions 6a, 6b, 7a, 7b, which abut each other, also have a constant curvature. It has been cut into shape. These cuts ensure that all structural parts can only be folded in the direction of the arrow shown in FIG.

Further, as shown in FIG. 4, when the stairs of this embodiment are completely folded, the position of the rivet 11 of the step support portions 3a and 3b is separated from the support columns 1 and 2 by a predetermined distance as described above. Therefore, the steps 6a, 6b,
A predetermined gap 13 is formed between the columns 7a and 7b and the columns 1 and 2, and even when the columns 1 and 2 are held with both hands and folded, they can be folded without pinching a finger.

Further, the vertical portions 6av and 6b of the step portion
Cut 1 at the part where v, 7av, 7bv touch each other
Since 4 is provided, a predetermined gap 15 is formed between them, and fingers or clothes are not caught in this portion, which is extremely safe.

Next, how the step portion supports the weight of the operator will be briefly described. Figure 5
(A) is a step part 6a, 6b in the middle of folding of FIG.
FIG. 6 is a view of the step connection portion 5a and the step connection portion 5a as viewed from the opposite side of the paper surface. Both step portions 6a in the open state as shown in FIG. The horizontal portions 6ah and 6bh of 6b are in contact with each other. Further, FIG. 6 shows a sectional view taken along the line AA of FIG.

The right and left portions of the vertical portion 5av of the step connecting portion 5a, the end portion of the step supporting portion 3a on the support column side, and the portions of the vertical portions 6av and 6bv of the step portions 6a and 6b which come into contact with each other
As described above, as shown in the drawing, the points having a constant curvature are processed.

Then, the horizontal portion 6 of the step portions 6a and 6b
An additional vertical portion 16 is provided on the ah and 6bh by welding, and the vertical portion 5av of the step connection portion 5a is connected to both vertical portions 6a.
It is sandwiched between v, 6bv and 16 and is rotatably attached by a rivet 12. Then, the step portion 6a,
The contact portions 17 of the horizontal portions 6ah and 6bh of 6b come into contact with each other in a folded state (see FIG. 5B).

The weight of the operator is supported by these two fulcrums. As a result, the notch 14 is formed as described above to prevent fingers or clothes from being caught between the left and right step portions when folded.

On the other hand, the step portion 6a and the step support portion 3
a has a similar structure and is rotatably attached with a rivet 11, and in the folded state, the upper end 1 of the step support portion 3a.
8 and the horizontal portion 6ah of the step portion 6a come into contact with each other. The weight is supported by these two fulcrums.

As shown in FIG. 6, the horizontal portion 6ah of the step portion is bent at an angle of about 105 degrees and its width (see FIG. 6).
(The horizontal direction of the paper) is wide enough that the worker
It is possible to work stably on the step part. Also, by making it wider, the strength of the step portion itself can be increased, and as a result, the length of the step portion can be lengthened and the width between the columns 1 and 2 can be lengthened, which is accompanied by rolling in a leaning state. You can prevent falls.

FIGS. 7 and 8 are plan views showing a second embodiment of the present invention, and FIG.
Shows the state in the middle of folding. In this embodiment, the first, second, third and fourth stanchions 100, 200, 3
An upper step support portion 3a and a lower step support portion 3b are fixedly provided at 00 and 400, respectively.

Particularly, the second and third support columns 200 and 300 are provided with support portions 3a and 3b on both sides. Step portions 6a and 6b are rotatably attached to both ends of the support portions 3a and 3b. Then, the predetermined side ends of the step support portions 3a and 3b are processed into a shape having a predetermined curvature and are uniquely moved in the direction of the arrow in FIG. 8, whereby the stairs are folded.

The step supporting portions 3a and 3b are L-shaped, and are provided at a position where the rivet 11 is separated from the supporting column by a certain distance. As described above, the step supporting portion 3a and the supporting column are in a folded state. A predetermined gap is provided between them so that fingers and clothes are not caught.

Further, since the shape of the step portion is as shown in the above-mentioned embodiment, the step portion has a strength enough to take the length thereof, and therefore, as in this embodiment, the steps are laterally stepped. Even if it is made, a plurality of workers can keep a sufficient distance from the next worker and can work with a margin.

This embodiment is an example of four columns, but by further increasing the columns, stairs occupying one side surface of a large bus can be provided, and a plurality of workers can work simultaneously. It is possible to improve work efficiency. Moreover, since it is foldable, it can be made compact when stored or moved.

Although not clearly shown in the drawing, the lengths of the step portions 6a and 6b are the same as those of the upper and lower step holding portions 3.
By making it shorter than the distance between a and 3b, it becomes possible to fold it completely.

[0037]

As described above according to the embodiments of the present invention, the present invention is of a folding type and has a low risk of pinching fingers or clothes at the time of folding, a simple structure, and improved stability, which is highly practical. Stairs can be provided.

It is needless to say that the present invention is not limited to the embodiments and can be applied to various modifications utilizing the same technical idea. Furthermore, the present invention is not limited to the upper and lower two rows as in the step portion of the above-described embodiment, but may be three or more rows.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a folding staircase according to an embodiment of the present invention.

FIG. 2 is a plan view of the folding staircase of the embodiment of the present invention in an open state.

FIG. 3 is a plan view showing a state where the folding staircase of the embodiment of the present invention is being folded.

FIG. 4 is a plan view of the folding staircase according to the embodiment of the present invention in a folded state.

FIG. 5 is a partial detailed view seen from the opposite side of FIG.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a plan view of the folding staircase of the second embodiment of the present invention in an open state.

FIG. 8 is a plan view showing a state where the folding staircase of the second embodiment of the present invention is being folded.

FIG. 9 is a diagram showing an example of a conventional folding ladder.

[Explanation of symbols]

1 1st support | pillar 2 2nd support | pillar 3a, 3b Upper part, lower step support part 4 Connecting rod 5a, 5b Upper part, lower step connection part 6a, 6b, 7a, 7b Step part 6ah, 6bh, 7ah, 7bh Of step part Horizontal part 6av, 6bv, 7av, 7bv Vertical part of step part 11, 12 Rivet 13, 15 Interval 100, 200, 300, 400 First, second, third,
Fourth post

Claims (3)

[Claims] 1. At least first and second support columns leaning parallel to an object, and at least an upper step support section and a lower step support section fixedly provided on the first and second support columns, respectively. And at least an upper step connecting part and a lower step connecting part connected via a connecting rod, between an upper step supporting part and the upper step connecting part provided on the first supporting column, and the first supporting column. Between the lower step support part and the lower step connection part provided on the second post, and between the upper step support part and the upper step connection part provided on the second post. Between the lower step support part and the lower step connection part, there is a step part rotatably provided on the support part and the connection part at both ends, and the first and second columns are parallel to the column. Naichi In the direction of
By moving the connecting rod in the opposite direction to the one direction, it is possible to fold the first and second columns and the connecting rod so as to be juxtaposed, and in the folded state,
The foldable staircase, wherein the upper and lower step support parts are configured so that a predetermined gap is formed between the step part and the first and second columns. 2. The step part according to claim 1, wherein the step part has a horizontal part and a vertical part, and is rotatable with the upper and lower step support parts and the upper and lower step connection parts at both ends of the vertical part. The horizontal portion has a width wider than that of the first and second columns, and a predetermined gap is provided between the vertical portions that are arranged close to each other in a folded state. A foldable staircase characterized by that. 3. At least first, second, third, and fourth support columns leaning in parallel to an object, and at least upper step supports fixed to the first to fourth support columns, respectively. Part and a lower step support part, at least the second and third columns are provided with the support parts on the left and right, and further, the first and second, the second and third, the third and the third. Between the upper and lower step support parts of the four columns, there are step parts rotatably provided on the support parts at both ends, and the first and third columns are arranged in parallel with the column. In the direction
By moving the second and fourth columns in the opposite direction to the one direction, it is possible to fold the first to fourth columns so that they are adjacent to each other, and in the folded state, the step is performed. The foldable staircase, wherein the upper and lower step support parts are configured so that a predetermined gap is formed between the part and the first to fourth columns.