JP2947398B2 - Folding temporary stairs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary folding staircase, and more particularly, to a temporary folding staircase used by a worker for ascending and descending and working at a construction site such as a house.

[0002]

2. Description of the Related Art Conventionally, on a construction site such as a house, a temporary stair is used for a construction worker such as a carpenter to move or work to a work site on a different floor. The temporary staircase is of a folding type which is convenient for transportation to the site and storage when not in use. The conventional folding temporary stairs can be folded by hinges and joints between the upper stairs and the lower stairs, where treads are erected on the upper side frame and the lower side frame formed by two side rods at appropriate intervals. And a folding handrail comprising an upper handrail member and a lower handrail member which can be disassembled, folded and assembled and connected (see Japanese Utility Model Laid-Open No. 2-121540).

[0003]

However, in a conventional folding temporary staircase of this type, the side frames of the upper staircase and the lower staircase have a structure in which two side bars are connected by a plurality of connecting bars, respectively. There has been a problem that the number of constituent members has increased, the rigidity has been lacking, the assembling requires a lot of time and labor, and has a large weight, which makes transporting and handling inconvenient. Also, in order to separate the upper handrail member and the lower handrail member by abutting the upper handrail member and the lower handrail member constituting the handrail with a thumb screw or the like, and loosening the thumb screw or the like when not in use, to loosen the thumb screw or the like,
There is a problem that it is troublesome to handle and takes up a lot of space when storing. Further, in the folded state, the upper stairs and the lower stairs are disengaged because the engagement of the joint is released and the upper stairs and the lower stairs are simply folded from the connection fixing portion such as a hinge. There was also a problem that it was inconvenient to carry. In addition, there are requests to use auxiliary handrails to increase stability when climbing the temporary stairs and auxiliary means such as auxiliary stairs for adjustment so that the length of the temporary stairs can be slightly extended. It is also desired to add.

[0004] The present invention has been made in view of the above circumstances, is lightweight and robust, easy to transport and handle,
Another object of the present invention is to provide a folding temporary staircase that is convenient for storage.

[0005]

In order to achieve the above object, a first folding temporary staircase according to the present invention comprises an upper staircase and a lower staircase for erection and fixing a tread plate at an appropriate interval between a pair of side frames. Assuming a folding temporary staircase that is foldably connected and has handrails detachably attached to at least one of the left and right side frames of the upper stairs and the lower stairs, the handrails are attached to the side frames of the upper stairs or A handrail support that can be attached to and detached from the side frame of the lower stairs, and a handrail support at the upper end of the handrail support
Upper part consisting of a handrail body fixed at an acute angle to the column
The handrail body and the upper end of the handrail support
A lower handrail body fixed at a right angle and the upper handrail
Do not slidably connect the handrail bodies of the body and the lower handrail body.
And a C-shaped cross section with the side frame opened outward.
Formed by extruded aluminum alloy
The fixing part of the above-mentioned tread is formed thicker than other parts
And furthermore, either the side frame of the upper stairs on either the left or right or
One end on the side frame of the lower stairs is pivotable by a pivot pin.
And the other end is locked by the locking pin of the other side frame and developed.
Keep the open state, or when folded, the other end
Locked by the locking pin when folding the side frame to maintain the folded state
It is characterized by having a stopper to hold
(Claim 1).

[0006] The second folding temporary staircase of the present invention, in addition to the configuration of the third folding temporary stairs, arranged a supporting member of the auxiliary handrail near the upper end of at least one of the side frame of the upper stairway An auxiliary handrail is detachably mounted on the support member (claim 2 ).

[0007] The third temporary folding staircase of the present invention comprises a main staircase comprising an upper staircase and a lower staircase in the first or second folding temporary staircase, and an elevation height connected to a lower end of the lower staircase. An auxiliary staircase for adjustment is provided, and a plurality of mounting holes for the auxiliary staircase are separately provided in a side frame of the lower staircase, and the auxiliary staircase is formed by a plurality of treads and side frames having the same shape as the lower staircase. A mounting member for fitting and holding the lower stairs is provided near the upper end thereof, and a mounting hole is formed in at least one of the mounting members on the side where the fitting holding groove is formed. those obtained by forming an auxiliary stairs attached, removably by a mounting hole for inserting and fixing the locking member into the mounting hole of the auxiliary stairs (claim 3).

[0008]

The folding device according to claim 1, which is constructed as described above.
According to the temporary stairs, when the handrail is provided on one side or both sides of the temporary stair, the handrail is attached to the upper frame of the upper stairs or the lower frame of the lower stairs, and the handrail is attached to the upper end of the handrail column.
It consists of a handrail body fixed at an acute angle to the support
On the handrail body and the upper end of the handrail support, this handrail support
It consists of a lower handrail body fixed at a substantially right angle, and the upper handrail body and the lower handrail body are slidably connected to each other so that the handrail body is stretched when the temporary stairs are attached, so that the upper handrail body and the lower handrail body are stretched. It can be attached to, also, not
When using, hold the handrail bodies of the upper handrail body and the lower handrail body together.
The compacted state becomes compact and the handrail is stored when not in use
Space can be reduced.

In addition, the side frame is formed of an extruded member made of an aluminum alloy having a substantially C-shaped cross section and having an outward opening.
By forming the fixing portion of the tread on the side frame to be thicker than the other portions, the number of constituent members can be reduced, and the weight and rigidity can be increased .

Also, a side frame of one of the upper stairs on the left or right.
Or one end side can be rotated by a pivot pin on the side frame of the lower stairs
And the other end is locked to the locking pin of the other side frame.
To keep the unfolded state, or when folded, the other end
It is locked by the locking pin when the side frame is folded and folded
By providing the stopper for holding, it is possible to hold the expanded state and folded state of the upper stair and bottom stair in a stable state.

In addition, since the auxiliary handrail is detachably mounted on at least one of the side frames of the upper stairs, the worker can grasp the auxiliary handrail when climbing the temporary stairs. Work safety can be improved (claim 2 ).

Further, by mounting the auxiliary stairs on the lower stairs so that the mounting position can be adjusted, the auxiliary stairs can be applied even when the interval between the upper and lower floors is longer than usual, and the versatility can be improved. 3 ).

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side view of a folding temporary staircase of the present invention in use.

In the temporary folding staircase of the present invention, an upper staircase 3 and a lower staircase 4 for erecting and fixing a tread plate 2 at a suitable interval between a pair of side frames 1 are foldably connected via connecting means 5. A handrail 10 is detachably attached to at least one (usually both) side frames 1 on the left and right sides of the upper stairs 3 and the lower stairs 4 via attachment plates 19a and 19b to form a main part. In addition, in consideration of strength and weight reduction, the tread 2 is provided at one end of the back surface of the tread surface as shown in FIG.
A hollow portion 2c is formed at the center and the other end with a rib-like reinforcing portion 2b.
It consists of extruded profiles. In other words, the hollow 2c
To be more rigid than the reinforcement 2b
The reinforcement 2b is rib-shaped to reduce the weight.
I have. As the connecting means 5, conventional means such as a hinge fixed over the left and right side frames 1 or a means fixed separately with rivets, bolts and nuts for the left and right side frames 1 are applied. A case where a hinge is used as a representative example will be described below.

As shown in FIG. 2, the side frame 1 is formed of an extruded aluminum alloy material having a substantially C-shaped cross section. The side frames 1 are opposed to each other with the opening portions facing outward, and the tread plates 2 are temporarily fixed to the opposed surfaces by welding W or the like. In this case, the fixing portion 1a of the tread 2 in the side frame 1 is formed thicker than the other portion 1b to maintain rigidity , and other portions other than the fixing portion 1a of the tread 2 are provided.
By reducing the thickness of 1b, the weight can be reduced. In addition, the uneven | corrugated thin strip 1 for anti-slip
When c is applied, a non-slip action or the like occurs, and the usability is enhanced. Further, it is preferable that a plurality of (three in the drawing, three cases) anti-slip protruding ridges 2a are formed on the surface of the tread plate 2;
By making the width as wide as about 0 to 20 cm, the safety of lifting and lowering can be enhanced, and the workability can be enhanced.

As shown in FIG. 3, hinges 5 for connecting the upper stairs 3 and the lower stairs 4 so as to be foldable are fixed to the left and right side frames 1 of the upper stairs 3 and the lower stairs 4 by welding or the like. Of the hinge halves 5a and 5b, and a pivot 5c for rotatably connecting the left and right hinge halves 5a and 5b.

The hinge half 5 of the hinge 5 thus constructed
One end of a stopper 7 is rotatably pivoted to one of the hinge half bodies 5b on the side of the lower staircase 4 by a pivot pin 6, and the other half, that is, the hinge half of the upper staircase 3 side. The body 5a is provided with an extended locking pin 7b which removably engages with a polished locking hole 7a provided on the free end side of the stopper 7, and the side frame 1 is folded. Of the upper stairs 3 and the lower stairs 4 by the stopper 7 in the unfolded state and the folded state .
It is configured to be held without rattling . The stopper 7 may be provided on both left and right sides, or may be provided on either one. Further, instead of the locking pin 7c, another one similar to the locking hole 7a having a polished shape may be further provided adjacent thereto.

At the upper end of the side frame 1 of the upper staircase 3,
An upper fixing bracket 8 for fixing the upper stairs 3 to the floor A on the floor (see FIG. 1) is rotatably mounted in the vertical direction. , Lower fixing bracket 9 for fixing the lower stairs 4 to the floor B below the floor
Are mounted rotatably in the vertical direction. In this case, as shown in FIG. 4 (a), the upper fixture 8 has a flat mounting piece 8b having two nail holes 8a and an inverted U-shape bent at one end of the flat mounting piece 8b. Hinge part 8c
It is composed of The lower fixing bracket 9 is shown in FIG.
As shown in (b), a flat mounting piece 9c having nail holes 9a on both ends and a rubber member 9b embedded in the lower surface, and a pair of bending parts on both sides of the center of the flat mounting piece 9c. 9d and a mounting piece 9e for attaching to the side frame 1.

On the other hand, the handrail 10 is provided on one side or both sides of the temporary stairs, and is provided on the side frame 1 of the upper stairs 3.
An upper handrail body 13 having a handrail body 12a laterally fixed thereto at the upper end of a handrail support 11a detachably attached to the rail, and a handrail body 12b at the upper end of a handrail support 11b detachably attached to the side frame 1 of the lower staircase 4. And the lower handrail body 14 fixed horizontally and the handrail bodies 12a and 12b of the upper handrail body 13 and the lower handrail body 14 are slidably connected to each other.

In this case, the handrail posts 11a and 11b of the upper handrail body 13 and the lower handrail body 14 are formed of a flat pipe-like aluminum alloy extruded profile having flat both sides, and are provided with anti-slip surfaces on their surfaces. (See FIG. 5). At the lower ends of the handrail supports 11a and 11b, a positioning pin 15 made of aluminum alloy and penetrating a flat portion is attached by welding or the like, and a mounting hole 16 is formed in parallel with the positioning pin 15. I have. The upper handrail body 13 and the lower handrail body 14 are provided with the thumb screws 17 penetrating the mounting holes 16 into the screw holes 18 of the upper mounting plate 19a and the lower mounting plate 19b fixed to the opening sides of the respective side frames 1. By being fastened, it can be attached to the upper stairs 3 and the lower stairs 4.

In this case, the upper mounting plates 19a are arranged side by side on the left and right side frames 1, and are formed in a rhombic shape so as to be fixed to the fixing portions 1a of the side frames 1 by welding or the like in an inclined manner. The lower mounting plates 19b are also arranged side by side with the left and right side frames 1 so that the handrail posts 11b of the lower handrail body 14 are orthogonal to the side frames 1, and are fixed to the fixing portions 1a of the side frames 1 by welding or the like. The upper mounting plate 19a and the lower mounting plate 19b are respectively formed in the upper mounting plate 19a and the lower mounting plate 19b. Polished positioning hole 2 having a diameter part and a small diameter part engaging with the head
0 is provided. Therefore, by inserting the positioning pin 15 into the large diameter portion of the positioning hole 20 and then dropping it into the small diameter portion, the screw hole 18 and the mounting hole 16 can be easily positioned. The upper handrail body 13 and the lower handrail body 14 can be attached to the upper staircase 3 and the lower staircase 4 respectively by fastening the penetrating thumb screw 17 to the screw hole 18. In order to remove the upper handrail 13 and the lower handrail 14 from the upper stairs 3 and the lower stairs 4, a procedure reverse to the above may be performed.

The handrail 10 constructed as described above is detachable from either the upper mounting plate 19a or the lower mounting plate 19b fixed to the side frames 1 on both sides of the upper stairs 3 and the lower stairs 4. It can be attached to one or both sides of the stairs as needed.

The handrail main body 12a of the upper handrail body 13 and the handrail main body 12b of the lower handrail body 14 are each formed of a pipe-shaped aluminum alloy extruded with a non-slip anti-slip surface on its surface. The upper handrail main body 12a is formed of a shape member, and the upper handrail main body 12a is slidably fitted into the lower handrail main body 12b so that the two handrail main bodies 12a and 12b can expand and contract with each other. As shown in FIG. 6, the upper handrail main body 12a is fixed to the handrail support 11a at an acute angle θ, and the lower handrail main body 12b is fixed to the handrail support 11b at a substantially right angle. Therefore, the handrail body 12 of the handrail 10 removed from the upper and lower stairs 3 and 4
The handrail 10 is raised to a height H by contracting a and 12b.
Handrail 10 that can be accommodated in length L and is not used
Storage space can be reduced. The angle between the upper handrail main body 12a and the handrail support 11a may be an acute angle.
It is optional, but it is preferable that the lower end of the handrail support 11a of the upper handrail body 13 does not protrude from the lower end of the lower handrail support 11b (see FIG. 6) .

By making each structural member of the folding temporary staircase of the present invention configured as described above an aluminum alloy member, weight reduction can be further achieved.

In the above embodiment, the case where the upper stairs 3 and the lower stairs 4 are foldably connected to each other by the hinges 5 has been described. Connection means such as rivets or bolts and nuts may be used. That is, as shown in FIG.
The rivets 5A pass through through holes 5f provided in mounting pieces 5d, 5e fixed to the side frames 1 of the upper stairs 3 and the lower stairs 4 in the same manner as the hinge halves 5a, 5b, respectively. At the same time, the crushed head 5g may be fixed by welding 5h or the like, or, as shown in FIG. 8B, bolts 5B and nuts 5C may be used instead of the rivets 5A. .

In the above embodiment, the handrail body 12a of the upper handrail body 13 is fitted into the handrail body 12b of the lower handrail body 14b. Conversely, the handrail body 12b of the lower handrail body 14b is connected to the upper handrail body 13a. May be fitted into the handrail main body 12a .

In a further preferred embodiment, cylindrical column supports 21 as supporting members for auxiliary handrails are fixed to the left and right side frames 1 on the upper end side of the upper stairs 3 by welding or the like. , An auxiliary handrail 22
Is inserted so as to be rotatable in the horizontal direction. The auxiliary handrail 22 includes a supporting column 23
An auxiliary handrail main body 24 is fixed between the upper ends of the support rails 23a and 23b, and the lower end of the support 23b has a structure similar to that of the lower fixing bracket 9 for fixing the auxiliary handrail 22 to the floor A on the floor. A fixing bracket 25 is attached. It is more preferable to provide a rubber elastic body for preventing slippage on the lower surface of each of the upper fixture 8, the lower fixture 9, and the fixture 25.

In the case of a preferred mode of increasing the versatility of the temporary folding stairs, as shown in FIG.
An auxiliary staircase 30 is provided at the lower end of the vehicle so that the height can be adjusted according to the distance between the floor and the floor. In that case, the side frame 1 of the lower staircase 4
A plurality of auxiliary staircase mounting holes 4a are provided in the thick portion of the vehicle corresponding to the interval between the treads 2, and the auxiliary staircase 30 is fixed in a detachable manner with the locking tool 31 through the mounting hole 4a.

The locking member 31 may be a fastening means such as a bolt and a nut, or a locking pin 32 as shown in FIG. That is, the locking pin 32
A mounting hole 4a provided in the lower staircase 4 which is a main staircase, and a mounting hole 3 provided in mounting members 33 and 34 of the auxiliary staircase 30.
5, a flange 32 b having a larger diameter than the mounting hole 35, and a fixed shaft laterally provided in a “U” -shaped opening 32 c formed at one end of the shaft 32 a. 32
d, and the retaining piece 32e is movably held to rotate by its own weight. When the retaining piece 32e is inserted into the mounting holes 35 and 4a, the retaining piece 32e rotates by its own weight, and the entire locking pin 32 is prevented from being removed. (See FIG. 10).

The auxiliary stairs 30 are of the same type as the side frames 1 and the treads 2 used in the lower stairs 4 and are assembled at the same step interval, and the lower stairs 4 are fitted and clamped near the upper end thereof. Attachment members 33 and 34 each having a substantially "Y" shape are fixed to the side frame 1 'of the auxiliary stairs by welding or the like, and are set up in steps with a width corresponding to the interval between the attachment holes 4a. Lower fixing bracket 9
Is provided instead of being attached to the lower staircase 4. In this case, it is preferable that the attachment members 33 and 34 be extruded members made of an aluminum alloy for weight reduction.
An L-shaped member 36 is provided by screws or the like for preventing friction and reinforcing, and a fitting / holding groove 37 of the lower staircase 4 is formed on the side where is attached and detached (see FIG. 10) .

In the auxiliary staircase 30 constructed as described above, the lower staircase 4 is fitted in the fitting holding groove 37, and the mounting holes 4a and 35 are coaxially locked at a position where a desired height is secured. The tool 31 is inserted and connected and fixed. In addition, by making the treads 2 of the auxiliary stairs 30 wider than the treads 2 of the main stairs, the gap between the treads 2 of the main stairs can be narrowed.

When using the temporary folding staircase of the present invention configured as described above, first, the upper staircase 3 and the lower staircase 4 are developed, and the side of the upper staircase 3 is inserted into the locking hole 7a of the stopper 7. The upper staircase 3 and the lower staircase 4 are held in an expanded state by engaging with a locking pin 7b protruding from the frame 1. Next, the upper handrail body 13 of the handrail 10 and the handrail body 12 of the lower handrail body 14
a, 12b are extended, and the positioning pins 15 of the handrail posts 11a, 11b of the upper handrail body 13 and the lower handrail body 14 are inserted into the large diameter portions of the positioning holes 20 of the upper and lower mounting plates 19a, 19b. The screw hole 18 and the mounting hole 16 are positioned by dropping into the screw hole, and the thumb screw 17 is screwed into the screw hole 1.
8 and the handrail 10 is attached. Then, the upper end of the upper staircase 3 is leaned against the floor A on the floor where the floor is to be used, and the upper fixing bracket 8 and the lower fixing bracket 9 attached to the side frame 1 of the upper staircase 3 are fixed to the floor with nails or screws. If fixed to the parts A and B, it can be used as a temporary staircase. After fixing the stairs, the support 23a of the auxiliary handrail 22 is inserted into the support receiver 21, and the fixing metal 24 attached to the lower end of the support 23b is fixed to the floor A with a nail or the like, so that the handrail 10 is fixed. An auxiliary handrail 22 can be provided in connection with the upper end, and the stairs can be moved up and down safely.

When the temporary stairs are to be removed, the nails fixing the upper fixture 8, the lower fixture 9 and the fixture 25 are removed, and the auxiliary handrail 22 and the handrail 10 are removed from the upper and lower stairs 3, 4. When the handrail 10 is removed, the upper staircase 3 and the lower staircase 4 from which the handrail 10 has been removed are disengaged from the stopper 7 which fixes the lower staircase 4, and the upper staircase 3 and the lower staircase 4 are folded. The upper stairs 3 and the lower stairs 4 are held in a folded state by being engaged with the stop pins 7b (see FIG. 7). Also, the handrail main body 12 of the removed handrail 10
As shown in FIG. 6B, when the upper and lower steps 3a and 4b are overlapped with the upper step 3 and the lower step 4 which are contracted and folded, for example, the temporary step of 3m or 4m is made compact within 2m. Can be easily loaded and transported on a van truck, and can be stored in a small space.

Further, in the case of a construction site where the floor space between the upper and lower floors is different from the normal or the mounting surface at the lower end of the lower staircase 4 must be concave, the auxiliary staircase 30 is detached from the lower fixing bracket 9. This can be dealt with by disposing it at the lower end of the lower staircase 4 and fixing it with the locking tool 31.

In the temporary staircase of the present invention, which side is the lower staircase 4 is appropriately selected at the time of use and is relative. Therefore, mounting holes 4a are provided in both the upper and lower staircases 3 and 4 of the temporary staircase. If formed, the orientation at the time of use does not matter, which is more preferable.

[0036]

As described above, according to the folding temporary staircase of the present invention, since it is configured as described above,
The following effects can be obtained.

According to the first aspect of the present invention, the handrail is attached to a handrail support that can be attached to and detached from the side frame of the upper stair or the side frame of the lower stair, and the handrail is attached to the upper end of the handrail support.
It consists of a handrail body fixed at an acute angle to the support
On the handrail body and the upper end of the handrail support, this handrail support
The lower handrail body is fixed at a substantially right angle, and the upper handrail body and the lower handrail body are slidably connected to each other .
The handrail can be easily attached to the stairs when used.
When not in use, the upper and lower handrail bodies are the same.
The handrails when not in use are compacted and the handrails when not in use
Storage space can be reduced. Therefore, it is possible to facilitate transportation to the site and storage when not in use.

Further, uneven thickness like Al side frame in a substantially C-shaped
Since it is formed of an extruded shape member made of a minium alloy and the fixing portion of the tread on the side frame is formed thicker than the other portions, the number of constituent members can be reduced, and the weight and rigidity can be increased.

Also, the side frame of one of the upper stairs on the left or right
Or one end side can be rotated by a pivot pin on the side frame of the lower stairs
And the other end is locked to the locking pin of the other side frame.
To keep the unfolded state, or when folded, the other end
It is locked by the locking pin when the side frame is folded and folded
It can be held in a stable state for a stopper provided Runode, the unfolded state and the folded state of the upper stair and bottom stair retain.

2 ) According to the folding temporary stairs described in claim 2 , in addition to the effect of the above 1 ), it is possible to enhance safety when climbing the temporary stairs.

3 ) According to the third aspect of the present invention, in addition to the effects of the above 1) and 2) , versatility according to the level of the floor surface at the building site can be enhanced.

[Brief description of the drawings]

FIG. 1 is a side view showing a use state of a folding temporary staircase of the present invention.

FIG. 2 is a cross-sectional perspective view showing a connection state between a side frame and a tread according to the present invention.

FIG. 3 is a main part side view showing an example of a use state of a stopper according to the present invention.

FIG. 4 is a perspective view showing an upper fixture and a lower fixture according to the present invention.

FIG. 5 is an exploded perspective view showing an attached state of a handrail according to the present invention.

FIG. 6 is a side view showing an extended state and a contracted state of a handrail according to the present invention.

FIG. 7 is a front view and a side view showing a folding temporary staircase of the present invention in a folded state.

FIG. 8 is a partial cross-sectional bottom view showing another embodiment of the connecting means in the present invention.

FIG. 9 is a partially enlarged side sectional view showing a mode of a folding temporary staircase provided with an auxiliary staircase.

FIG. 10 is a sectional view taken along the line XX of FIG. 9;

FIG. 11 is a partially cutaway perspective view of the locking tool according to the present invention.

[Description of Signs ] 1, 1 ' side frame 1a fixing portion 1b other portion 2 tread plate 3 upper stairs 4 lower stairs 4a mounting hole 5 hinge (connecting means) 5A rivet (connecting means) 5B bolt (connecting means) 5C nut (Connecting means) 6 Pivot pin 7 Stopper 7a Lock hole 7b, 7c Lock pin 10 Handrail 11a, 11b Handrail support 12a, 12b Handrail body 13 Upper handrail body 14 Lower handrail body 21 Support post (support member) 22 Auxiliary handrail Reference Signs List 30 auxiliary stairs 31 locking tool 32 locking pin (locking tool) 33, 34 mounting member 35 mounting hole 37 fitting holding groove

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E06C 1/00-9/14

Claims (3)

(57) [Claims] 1. An upper stair and a lower stair for erecting and fixing a tread plate at an appropriate interval between a pair of side frames, and are foldably connected to each other, and at least one of right and left side frames of the upper and lower stairs. to the detachably attached to formed by folding temporary stairway handrail, the handrail, and a handrail posts detachable from the side frame of the side frame or the bottom stair of the upper stairway, the upper end of the handrail posts, this
The handrail body is fixed at an acute angle to the handrail support.
To the upper handrail body and the upper end of the handrail support.
And a lower handrail body fixed at a substantially right angle
The handrail bodies of the lower and lower handrails are slidably connected to each other.
And aluminum having a substantially C-shaped cross section with the side frame opened outward.
Formed of an extruded section made of an alloy, and
The fixed part of the serial step board is formed thicker than other portions, further, left
One of the right side frame of the upper stairs or the side of the lower stairs
One end side is pivotally connected to the frame by a pivot pin, and the other end is
The side is locked by the locking pin of the other side frame to maintain the deployed state
Or the other side of the frame when folding
The lock that is locked by the lock pin at the time
A temporary folding staircase characterized by having a pa . 2. The method of claim 1, wherein the folding temporary stairway, at least near the upper end of one side frame of the upper stairway, the support member of the auxiliary handrail disposed, the auxiliary handrail detachably mounted on the support member Folding temporary staircases. 3. The folding temporary staircase according to claim 1, comprising a main staircase comprising an upper staircase and a lower staircase, and an auxiliary staircase connected to a lower end of the lower staircase for height adjustment. In the side frame of the lower stairs, a plurality of mounting holes for the auxiliary stairs are spaced apart, and the auxiliary stairs are composed of a plurality of treads and side frames having the same shape as the lower stairs, and the lower stairs are provided near the upper end thereof. A mounting member to be fitted and clamped is provided stepwise, and a mounting hole is formed in at least one of the mounting members on the side where the fitting and holding groove is formed. A folding temporary staircase, wherein an auxiliary staircase is attached and removed by inserting and fixing a tool.