JPH11182022A - Folding stair device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely fold stairs as ramp part or turning pace floors in an erected frame and enable the reduction of an occupied space freely. SOLUTION: A down stair 11 pivoting the upper end on one inside end of turning pace floors 6a and 6b and an up stair 12 pivoting the lower end on the other inside end of the turning pace floors 6a and 6b are provided. The lower end of the down stair 11 is borne on a first guide member 44 in a movable manner for pace floors 5a and 5b located at lower positions of the turning pace floors 6a and 6b, and the upper end of the up stair 12 is borne by a second guide member 55 in a movable manner for pace floors 7a and 7b located at upper positions of the turning pace floors 6a and 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding staircase device which is established near a building and used when repairing or repairing an existing building.

[0002]

2. Description of the Related Art Conventionally, when performing a repair work or a renovation work on a building, for example, an ascending and descending ramp (stairs) is connected to four building frames and a longitudinal end of the ramp is connected. Various temporary lifting devices provided with a landing floor have been used.

[0003] Such a temporary elevating device is constructed as a whole in which a ramp section and a landing floor are integrally assembled in four building frames, or as an assembly in which these are disassembled and assembled. The structure is generally complicated. Reinforcing means are provided as necessary so as to obtain predetermined strength, durability and safety.

[0004]

However, among the conventional temporary elevating and lowering devices which are integrally assembled as described above, it is necessary to transport the device to a construction site or to lift it from the construction site. In addition to the high transportation cost, there is a problem that a large-sized one may not be able to be transported depending on vehicle conditions or road conditions.

On the other hand, in the case of the temporary elevating device which can be disassembled as described above, the work of assembling the building close to the building at the construction site is troublesome, and the efficiency of the assembling work is deteriorated. It is necessary to sufficiently manage each of the assembling members and components constituting the lifting device, and there is a problem that the loss or lack thereof impairs the safety and reliability of the structure.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and makes it possible to arbitrarily reduce the entire occupied space by making a stairway or a rotating landing floor which is a ramp section foldable in a building frame. Accordingly, it is an object of the present invention to provide a safe and reliable folding staircase device which can simplify transportation and handling and can easily be established in a small space.

[0007]

In order to achieve the above object, a folding staircase device according to the first aspect of the present invention comprises a landing floor of a plurality of floors erected between a pair of building frames out of two pairs of building frames,
A split turn that is erected over a plurality of steps between the other pair of building frames so as to be stepped in the height direction with respect to the landing floor, and is vertically pivotally supported independently at the outer end side independently from each other. A moving landing floor, a descending staircase having an upper end pivotally supported at one inner end of the rotating landing floor, and a lower end pivotally supported at the other inner end of the rotating landing floor. We set up stairs and
For the landing floor below the rotating landing floor, the lower end of the down stairs is movably supported by the first guide member,
The upper end of the ascending stairs is movably supported by the second guide member on the landing floor above the rotating landing floor.

In the folding staircase device according to the second aspect of the present invention, foldable handrails are provided on both sides of the ascending stairs and the descending stairs so as to fall over the stairs.

The folding staircase device according to the third aspect of the present invention is capable of extending and contracting between a supporting rod for supporting a landing floor and a supporting rod for supporting a rotating landing floor which are opposed to each other in a diagonal direction, and the expansion and contraction position is fixed by bolts. A support breath that can be installed is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the entire folding staircase device of the present invention. The folding staircase device is mounted on two I-beams 1 juxtaposed on the ground and a square frame steel 2 installed on the I-beams.

In addition, at the four corners of the upper surface of the square frame steel 2,
A support cylinder 3 as shown by a dotted line is integrally provided by welding or the like. The lower ends of the tubular building frames 4a, 4b, 4c, and 4d are inserted into these support tubes 3, respectively, and are supported so that they stand upright.

A pair of building frames 4 facing each other
For example, E-shaped frames F1 and F2 are alternately mounted over a plurality of stages between a and 4b and between 4c and 4d. A pair of landing floors 5a, 5b, 7a, 7b, 9a, 9b and a pair of rotating landing floors 6a, 6b, 8a, 8b are arranged as shown.

Here, landing floors 5a, 5b, 7a, 7
b, 9a, 9b are fixedly attached to the frame F1, and the rotating landing floors 6a, 6b, 8a, 8b are attached to the frame F1.
2 so as to be pivotable. The details of the rotating structure will be described with reference to FIGS. 2 and 3. In FIG. 1, however, each rotating landing floor 6a, 6b, 8a, 8b is shown as being pivotally supported on a support shaft 10b on a bracket 10a. It is.

In the drawing, one pair of building frames 4a, 4b is shown.
The second-stage swing landing floor 6 divided into two parts supported by the side
The upper end of the downstairs 11 to the landing floor 5a is pivotally supported at the inner end of one of the rotating landing floors 6a, and the inner end of the other rotating landing floor 6b. The lower end of the stairs 12 going up to the landing floor 7b is pivotally supported by the section.

FIGS. 2 and 3 show such a down stairs 11.
FIG. 3 is an exploded perspective view showing the pivotal support structure of the ascending stairs 12 in detail. The above-mentioned split landing floor 6a,
6b is interposed between the three support rods 13 of the frame F2.

The hinge pieces 30, 32 projecting from the outer ends of the rectangular frames W constituting the respective rotating landing floors 6a, 6b are provided with brackets 3 projecting inside the support rod 16 of the frame F2.
5, 36 are rotatably supported. A lath net as a step is stretched over the rectangular frame W.

The rotation of the hinge pieces 30 and 32 is performed by the mounting hole 29 and the bracket 35 of each hinge piece 30.
Bolts 38 in the mounting holes 34 of the hinge pieces 32 and the mounting holes 36 of the brackets 37, respectively.
It is made possible by stopping with a nut 39 through the hole.

The upper surface on the inner end side of the rectangular frame W constituting each rotating landing floor 6a and the rectangular frame W constituting the rotating landing floor 6b.
Rotation restricting pieces a and b for restricting the rotation of each support rod 13 to one and the other are attached to the lower surface on the inner end side.

Further, mounting holes 1 are respectively formed on the lower surface on the inner end side of the rotating landing floor 6a and the upper surface on the inner end side of the rotating landing floor 6b.
A pair of brackets 15 having a mounting hole 17 and a pair of brackets 15 having a mounting hole 17 are mounted.

The rotation restricting pieces a and b are provided with through holes a1 and b1, respectively. The through holes a1 and b1 are provided in the support frame 13 so that the through holes a1 and b1 are aligned. By inserting the retaining pin N into the bolt P, the supporting rod 13 of each of the rotating landing floors 6a and 6b is inserted.
Horizontal movement and rotation are restricted.

On the other hand, on both sides of the descending stairs 11, long reinforcing oblique rods 19 are integrally mounted, and mounting holes 20 are provided at the upper ends thereof.

Accordingly, the upper end of the oblique rod 19 and the support rod 13
And the mounting holes 14, 20.
As described above, the upper end of the descending staircase 11 can be pivotally supported at the inner end of the turning landing floor 6a by inserting the bolt 21 into the bolt 21 and screwing the nut 22 into the bolt 21.

Similarly, long oblique rods 23 are integrally mounted on both sides of the ascending stairs 12, and mounting holes 24 are provided at their lower ends.

Accordingly, the lower end of the oblique rod 23 and the bracket 18 provided on the rectangular frame W of the rotating landing floor 6b are joined, the bolt 25 is inserted into each of the mounting holes 17, 24, and the nut 26 is screwed into this. Thus, the lower end of the ascending stairs 12 can be pivotally supported on the inner end of the rotating landing floor 6b as described above.

A mounting cylinder 28 for mounting a handrail 27 for stairs is mounted on each of the oblique rods 19 and 23. These handrails 27 have their lower ends inserted into mounting cylinders 28 erected on the respective oblique rods 19 and 23 and are fixed by screws.

Although not shown in detail in the figure, the handrail 27 is loosened by loosening the screws, and the lower ends of the handrails 27 are slightly pulled up from the mounting tube 28 so as to be laid on the steps 11, 12. Each of the stairs 11 and 12 has a mounting structure that can be folded.

Each of the support rods 1 at the left and right ends of the frame F2
A handrail 40 as shown in FIG. 1 is provided upright on the upper surface 3, and a handrail 41 is also provided upright on the support rod 16 between the building frames 4a and 4b.

FIGS. 4 and 5 show the mounting structure of the rotating landing floor 5a of the lowermost left and right rotating landing floors 5a and 5b. These rotating landing floors 5a and 5b have two building frames 4
The supporting rods 42 of the frame F1, which are formed integrally with the E-shaped frame F1 provided between c and 4d and are located on both sides of the turning landing floors 5a and 5b, have a split structure with a gap G1 interposed therebetween. ing. Here, the support rod 42 is configured such that two channel members are arranged to face each other.

On the opposite sides of the two channel members, roll running paths c and d are provided. Reference numeral 43 denotes a sheet metal L-shaped fitting which can be partially inserted into the gap G1. Four guide rolls as four first guide members which run while rotating on the roll running paths c and d are provided below the fitting. 44 are attached.

Further, between the two pairs of first guide members 44 of the L-shaped bracket 43, there are provided through holes 45 for travel stop pins.
Further, a mounting hole 46 is provided at a portion of the L-shaped bracket 43 protruding above the gap G1.

The support rod 42 has a through-hole 42a penetrating inward and outward on the side surface of the tip end. By inserting a travel stop pin 47 into the through-hole 42a and the through-hole 45 provided in the L-shaped bracket 43. The travel of each guide roll 44 on the roll travel paths c and d can be regulated. By removing the travel stop pin 47, the guide roll 44 can rotate and travel. Reference numeral 48 denotes a mounting hole for mounting a handrail 49 provided on the upper surface of the distal end of the support rod 42.

The lower end of the sloping rod 19 integrally provided on the side surface of the down stairs 11 is in contact with the portion of the L-shaped bracket 43 projecting above the gap G.
The bolt 52 is passed through the mounting hole 50 formed at the lower end of the L-shaped bracket 43 and the nut 52 is screwed into the mounting hole 50, and the lower end of the descending stairs 11 is pivotally supported by the inner end of the landing floor 5a. You.

Therefore, the travel stop pin 47 is connected to each through-hole 42.
When the L-shaped fitting 43 is pulled out of the gaps a and 45, the lower end of the stairs 11 moves in the same direction in the gap G1, whereby the stairs 11 can be folded as described later.

FIGS. 6 and 7 show the landing floors 7a and 7 described above.
b and stairs 12 going up to these landing floors 7a, 7b
And stairs 62 going down to these landing floors 7a and 7b
2 shows the mounting structure. First, the oblique rods 23 as described above are attached to both sides of the ascending stairs 12, and an attachment hole 53 is provided at an upper end of these oblique rods 23.

The landing floors 7a and 7b have two building frames 4.
The support rod 58 formed integrally with the E-shaped frame F1 erected between c and 4d and constituting the frame F1 located on both sides of the landing floors 7a and 7b has a split structure with a gap G2 interposed therebetween. ing. Here, the support rod 58 is configured such that two channel members are opposed to each other.

Roll running paths e and f are provided on the opposite sides of the landing floors 7a and 7b via the gap G2. Reference numeral 58a is a through hole for inserting a travel stop pin formed in the opposite portion of the landing floors 7a and 7b.

A T-shaped metal fitting 54 is movably interposed in the gap G2. The T-shaped bracket 54 is provided with four guide rolls 55 as four second guide members rotating on the roll traveling paths e and f, and one mounting hole 56 and 57 respectively provided on upper and lower pieces. ing. 59
Is a through hole provided in the T-shaped bracket 54 and into which a travel stop pin (not shown) is inserted together with the above through hole 58a.

Further, the lower piece of the T-shaped bracket 54 provided with the mounting hole 57 and the upper end of the inclined rod 23 of the stairs 12 are joined, bolts 60 are passed through the mounting holes 53 and 57, and nuts are further passed through the bolts 60. By screwing 61, the upper end of the oblique rod 23 is pivotally supported on the T-shaped bracket 54. That is, the upper end of the stairs 12 is movably supported by the inner end of the landing floor 7b via the T-shaped bracket 54.

Further, on the upper piece of the T-shaped bracket 54, a lower end of an oblique rod 63 integrally provided on both sides of a stair 62 going up to the rotating landing floors 8a and 8b is provided with a bolt 64 and a nut (not shown). Is pivotally fixed.

A mounting cylinder 28 for mounting the handrail 27 is integrally attached to each of the slanted rods 23 and 63.

Further, the turning landing floor 8b in FIG.
Attachment of the descending stairs 65 to the lower end of the oblique rod 66 to the rotating landing floor 8b is performed by the rotating landing floor 6b and the ascending stairs 12, that is, the descending stairs 1 to the rotating landing floor 6b.
The mounting is performed in the same manner as the mounting with the second oblique rod 23.

Further, the upper end of the sloping rod 66 of the descending stairs 65 and the rightmost landing floor 9b (not shown) of the two uppermost landing floors 9a and 9b are attached upward. It is performed in the same manner as the attachment of the oblique rod 23 of the stairs 12 and the landing floor 7b.

Reference numeral 49 denotes a handrail standing upright on the support rod 42 of the landing floor 5a and the rotating landing floor 6a, and an E-shaped frame F1 and a handrail 67 substantially similar to those described above between the building frames 4c and 4d.
Is provided. Reference numeral 68 denotes a stairway connecting the landing floor 5b and the ground, and a handrail 67 is omitted at a location where the stairway 68 is attached.

The four building frames 4a, 4b, 4
Supporting cylinders 69 are integrally provided on c and 4d, respectively, and the lower ends of the frames 4e, 4f, 4g, and 4f of the folding staircase device having the same configuration as those described above are provided on these supporting cylinders 69, respectively. It is inserted and can be erected upward.

When the folding staircase device is stacked in two or more steps, it can be used as a repair scaffold for an existing high-rise building.

In this case, the rotating landing floor 8b
The upper end of the oblique rod 66 integrated with the descending stairs 65 is connected to one end of the uppermost right landing floor 9b facing above the landing floor 7b, and a T-shaped bracket, an L-shaped bracket, and a guide similar to the above. It is supported via a member. Here, the step portion (lass net) of the landing floor 9a composed of the frame F1 is shown in FIG.
Has been removed as shown.

As shown in FIG. 8, the landing floors 5a and 5b at the bottom of the landing floors on the side of the upper folding staircase device are basically the landing floors 5a and 5b of the lower folding staircase device. It has the same mounting structure as 5b, but here the step portion of the landing floor 5b is removed.

The mounting hole 57 of the T-shaped bracket 54 and the slope of the stairs 65 similar to those shown in FIG. 7 are moved between the split channel members 72a and 72b constituting the supporting rod 42 on the landing floor 9b side. A bolt 74 is passed through the mounting hole 73 at the end of the rod 66, and the inner end of the scaffold floor 9b and the descending stairs 6
5 is pivotally connected.

The above-mentioned folding staircase device stacked on the upper stage has basically the same structure as that of the lower stage, but FIG.
As shown in the figure, in the lowermost frame F1, the step portion (lass net) corresponding to the landing floor 5b is removed.

Also, a part of the L-shaped bracket 43 has a lower end of the oblique rod 19 provided on the stairs 11 descending to the landing floor 5a.
It is pivotally supported by bolts 51 and nuts 52.
Reference numeral 47 denotes a travel stop pin which is inserted through a part of the support rod 42 and regulates the movement of the L-shaped bracket 43 in the gap G1.

The folding staircase device of the present invention is assembled and configured as described above. When the folding staircase device is to be transported, the folding staircase device stacked in a plurality of stages is connected to the upper building frames 4e, 4f, and 4f. 4g and 4h are detached from the support cylinder 69, and the building frames 4a, 4b, 4c and 4d are detached from the support cylinder 3 and are suspended from the top by a crane on the ground. Also, the handrail 27 on each of the steps 11, 12, 62, 65 is folded so as to lie on them.

When the folding stairs device is hung above the ground with a crane in this way, for example, as shown in FIG. 9, four ends of four wires 75 are hung on both ends of two building frames 4a and 4b.
Further, this is suspended via a single wire 76, and the folded staircase device is lowered to the ground so as to lie horizontally on the whole.

Next, as shown in FIG. 1, each of the stairs 11, 1 of the folding staircase device thus lowered to the ground is used.
2, 62, 65 each handrail 27, these stairs 11,
Lay them on top of 12, 62, 65 so that they lie down.

In parallel with this, the through holes 42a, 45
The running stop pin 47 is pulled out of the through hole 58a, 5
From FIG. 9, a travel stop pin (not shown) is extracted.

In this state, the wire 7 is
The folding stairs device is slowly lowered from 5,76. In this suspended state, as shown in FIG. 10, the building frames 4a and 4b are lowered by their own weights.
At this time, the two swing landing floors 6a and 6b are suspended by being supported by bolts on the brackets 35 and 37, and at the lower ends (inner ends) of the swing landing floors 6a and 6b,
Each stair 1 pivotally supported by bolts 21 and nuts 22
1 and 12 are respectively suspended in a “C” shape.
At this time, the lower ends of the steps 11, 12 are on the support rods 42, 48 in FIG.

When the wires 75 and 76 are further slowly lowered, each of the inclined rods 1 of each of the steps 11 and 12 is moved downward.
The lower ends 9 and 23 (in FIG. 10) move downward (retreat) in the gaps G1 and G2 by the guide rollers 44 and 55 together with the L-shaped fitting 43 and the T-shaped fitting 54.

At this time, since each of the turning landing floors 6a and 6b is controlled to be turned to one side by the turning restricting pieces a and b, when the retraction stops, the respective stairs 11 and 6 are turned on.
Due to the weight of 12, the upper ends of the oblique rods 19 and 23 are pushed in the left and right directions (opposite directions) in the figure, and open in the shape of "C" as shown by the solid line in FIG.
When the floors 6a and 6b of the turning landings are opened to the maximum, the stairs 11 and 12 are finally folded substantially horizontally so that the stairs 11 and 12 are alternately set back and forth.

On the other hand, when the above-mentioned folding stairs device is used for repairing an existing building or the like, the above-mentioned folding stairs device in a folded state is transported on a truck.
At the work site, a crane is used to start up the procedure shown in FIG.

At this time, each of the steps 11, 12, 62, 65
The handrail 27 is raised and fixed, the travel stop pin 47 is inserted into the through holes 42a and 45, and the travel stop pin (not shown) is inserted into the through holes 58a and 59, so that the folding staircase device can be used as a work platform. It can be used for ascending and descending to the work floor.

FIG. 11 shows four building frames 4e and 4 of the upper folding staircase device stacked in two stages as shown in FIG.
A cantilever type support beam 77 is fixed to the upper ends of f, 4g, and 4h, and a wire 79 that suspends the tip of the support beam 77 is pulled and held in the ground direction via a pulley 78.

Therefore, a heavy wire winding machine 81 can be attached to the tip of the support beam 77, and the bridge can be connected to the wires 82 and 83 which can be freely wound and rewinded by the wire winding machine 81. By suspending the bridge 80 at a predetermined height and bridging it between the folding staircase device and another structure 84, the bridge 80 is raised and lowered to a high position of the structure 84, and work at a high place is performed. It can be used as a work passage or work scaffold.

In the above embodiment, two building frames 4
a, 4b are hung on both ends of four wires 75, and further suspended by a crane via one wire 76,
When it is lowered to the ground and folded under its own weight, the pin 47 inserted into the through hole 42a provided in the support rod 42 and the through hole 45 provided in the L-shaped bracket 43 is removed, and further provided on the support rod 58. Through hole 58a and T-shaped fitting 54
It is necessary to pull out a pin (not shown) inserted in the through hole 59 provided in the above.

Incidentally, the wire 76 is moved by the crane.
During the work of suspending the building frames 4a, 4b with
There is a case where it is extremely dangerous for the worker to pull out the pins 47 and the like near the crane or on the building frames 4c and 4d.

Therefore, in order to avoid such danger and to allow the stairs to be smoothly folded,
As shown in FIG. 12, the support rod 13 provided on the
Support brackets 85 and 86 are respectively provided on support rods 42 and 58 provided on the building frame 4c which faces the building frame 4c in a diagonal direction.
On the other hand, both ends of the telescopic support breath 87
Are rotatably connected in order as shown in the figure.

Of these, the support breath 87 is a pipe rod 87
a, a rod 87b is slidably provided in the rod 8a.
The sliding position of 7b can be locked and unlocked by a bolt 89 screwed from the outer periphery of the pipe rod 87a. In addition, by guiding a linear long hole or a long groove provided in the rod 87b along a pin 90 attached so as to protrude into the pipe rod 87a, the pipe rod 87a
It is possible to smoothly slide the rod 87b inside.

Therefore, in the state where the folding stair device is raised as shown in FIG. 1, the supporting breath 87 is in the most extended state as shown in FIG. Is locked. Therefore, each support rod 13 and support rod 42,
12 is supported in the horizontal direction in FIG. 12 so that each support breath 87 is stretched, and the relative distance between them is fixedly and stably maintained.

Therefore, by maintaining these relative distances stably, the support rods 42 and L shown in FIGS.
Each of the through holes 42a and 45 provided in the
7 and the through-holes 58a, 5a provided in the support rod 58 and the T-shaped bracket 54 shown in FIGS.
Even if a pin (not shown) is removed from the roller 9, the guide rolls 44 and 55 cannot travel freely on the roll traveling paths c, d, e, and f. Does not move freely along the supporting rods 42, 58.

On the other hand, when the folding staircase is folded, it is hung horizontally by a crane using chains 75 and 76 as shown in FIG. 13 and gently lowered to the ground. What is necessary is just to loosen the bolt 89 of the support breath 87 immediately beside.

As a result, in the process of lowering the chains 75 and 76 more gently, the support brace 87 contracts while the rod 87b enters the pipe rod 87a, and finally the weight of the building frames 4a and 4b causes the support brace 87 to finally contract. The support rod 13 end is the building frame 4
The folding reaches the position corresponding to c and 4d.

At this time, since the guide rolls 44 and 45 run freely on the roll running paths c, d, e and f, the ends of the oblique rods 19 and 63 lightly move along the support rods 42 and 58. The oblique rods 19 and 63 are simultaneously moved and folded.

It is to be noted that the rising of the stair device from the folded state is performed in the same manner as described above, and the bolt 89 of the support breath 87 is firmly tightened after the rising, so that the standing structure is stably held.

[0072]

As described above, according to the first aspect of the present invention, a landing floor of a plurality of floors installed between a pair of building frames of two pairs of building frames and another pair of building frames. A two-part rotating landing floor that is suspended over a plurality of steps so as to be stepped in the height direction with respect to the landing floor and that is vertically and independently rotatably supported on the outer end side; A down staircase whose upper end is pivotally supported at one inner end of the dynamic landing floor, and an ascending staircase whose lower end is pivotally supported at the other inner end of the rotating landing floor, The lower end of the down stairs is movably supported by the first guide member with respect to the landing floor below the rotating landing floor, and the upper end of the ascending stairs is located above the landing floor above the rotating landing floor. Part is configured to be movably supported by the second guide member, so that the stairs and the rotating landing floor that are It can be freely folded in the frame, so that the space occupied by the entire folding staircase can be arbitrarily reduced, thereby simplifying transportation and handling, and can also be easily realized in a small space at the work site. The effect is obtained.

According to the second aspect of the present invention, foldable handrails are provided on both sides of the ascending stairs and the descending stairs so as to be able to fall over the stairs. At the same time, there is an effect that the handrail can be compactly stored in the contracted building frame.

According to the third aspect of the present invention, the support brace which can be extended and contracted between the supporting rod for supporting the landing floor and the supporting rod for supporting the rotating landing floor which are opposed to each other in a diagonal direction, and which can be fixed by the bolt at the extended / retracted position. Is constructed so that it is possible to eliminate the troublesome and dangerous pin removal work required at the time of folding work as in the conventional case, thereby improving the efficiency of the folding work and ensuring the safety. can get.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of an essential part of an attachment structure of a staircase and a rotating landing floor in FIG. 1;

FIG. 3 is an exploded perspective view showing a main part of the rotating landing floor in FIG. 1;

FIG. 4 is an exploded perspective view of an essential part showing an attachment structure of another staircase and a landing floor in FIG. 1;

FIG. 5 is an exploded perspective view showing a mounting structure of the L-shaped bracket shown in FIG. 4;

FIG. 6 is an exploded perspective view of an essential part of a structure for mounting still another staircase and a landing floor in FIG. 1;

FIG. 7 is an exploded perspective view showing a mounting structure of the T-shaped bracket shown in FIG. 6;

FIG. 8 is an exploded perspective view of a main part showing an attachment structure of a staircase and a scaffold floor of a folding staircase device stacked in two stages.

FIG. 9 is a perspective view showing a state where the folding staircase device of the present invention is suspended.

FIG. 10 is a perspective view showing a state in which the folding staircase device of the present invention is folded.

FIG. 11 is an explanatory diagram showing a situation in which a bridge is hung on the folding staircase device of the present invention.

FIG. 12 is a front view of a main part showing a mounting structure of a support breath according to another embodiment of the present invention.

FIG. 13 is a perspective view showing a state where the folding staircase device having a support breath in FIG. 12 is suspended.

[Explanation of symbols]

4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h Building frame 5a, 5b, 7a, 7b, 9a, 9b Landing floor 6a, 6b, 8a, 8b Rotating landing floor 11, 12, 62, 65 Stairs 13 , 16, 42, 58 Support rod 27 Handrail 44 Guide roll (first guide member) 55 Guide roll (second guide member) 87 Support breath

Claims (3)

[Claims] A landing floor of a plurality of floors installed between a pair of building frames out of two pairs of building frames, and a plurality of floors between the other pair of building frames so as to be stepped in a height direction with respect to the landing floor. A split landing floor that is erected over the steps and vertically pivotally supported on the outer end side independently from each other, and an upper end is located at one inner end of these rotating landing floors. A pivoted down stair, an up stair with a lower end pivotally supported at the other inner end of the rotating landing floor, and a lower end of a down stair with respect to the landing floor below the rotating landing floor A first guide member for movably supporting the section, and a second guide member for movably supporting the upper end of the ascending stairs with respect to the landing floor above the rotating landing floor. And folding staircase device. 2. The folding staircase device according to claim 1, wherein handrails are provided on both sides of the ascending stairs and the descending stairs so as to be able to fold over the stairs. 3. A support brace is provided between a supporting rod for supporting a landing floor which faces diagonally and a supporting rod for supporting a rotating landing floor, and a support brace is provided which is extendable and can be bolted at an extended position. The folding staircase device according to claim 1.