JPH0439941Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a folding staircase used to access the second floor of a garage or the like.

``Prior Art'' Conventional stairs include a removable type, a ladder, an accordion-style folding type in the ascending and descending direction, a flip-up type at the bottom, a sliding type for storage at the top, etc., but they have the following drawbacks.

a Items that are stored on top or are removable,
Because they were lightweight, they lacked rigidity and could not be equipped with handrails, making lifting and lowering cargo inefficient and dangerous.

b Removable types are difficult to move and store.

c There was insufficient space to store items that could be stored at the top and measures to prevent them from falling.

``Problem to be solved by the invention'' The present invention aims to solve the above-mentioned drawbacks and develop a staircase that is safe and can be stored compactly.

``Means for Solving the Problems'' To explain the solution now, the fixed span girders 1 and the movable span girders 2 made of structural materials are hinged to an appropriate number of treads 6 in a rotatable structure, and the movable span girders are A lifting device connection locking device 8 is provided on the girder 2.

``Function'' Since this project has the above-mentioned structure, when using it as a staircase, the movable spanner girder 2 is lowered to a predetermined position using a hoisting device.
At the time of storage, a lifting device moves the movable flattened girder 2 to the storage position and fixes it.

"Example" a The lower part of the fixed span girder 1 made of light groove steel etc. is fixed with anchor bolts etc., and the upper part is also fixed to the second floor part with bolts etc.

b. A handrail 3 is provided on the movable cross-section girder 2 made of light groove-shaped steel, etc., and a lifting device connection locking tool 8 is provided at an appropriate position on the movable cross-section girder 2.

c The footboard 6 is formed from a plate material with a non-slip surface.

d. A cylindrical member 4 of an appropriate length is inserted into both ends of the shaft 5, the cylindrical member 4 is fixed to the footboard 6, and the center portion of the shaft 5 is fixed to the fixed crossbeam 1.

e. Attach a U-shaped positioning reinforcement 7 to the lower part of the other end of the footboard 6.

f Cylindrical material 4 of appropriate length is placed at two locations on both ends of the shaft 5
is inserted, and the central part of the shaft 5 is fixed to the lower part of the positioning reinforcement 7, and the cylindrical member 4 is fixed to the movable salient girder 2.

g. Provide an appropriate number of screwed footboards 6 with a rotatable structure as described above.

h When storing, connect the lifting device for lifting and lowering to the lifting device connection locking tool 8 of the movable spanner girder 2.

The above is one embodiment of the present invention.

"Effect of ideas" This invention has the following effects.

a High rigidity as the connection between the tread and the sasara girder is hinged.

b. The connection between the first and second floors of the fixed sasara girder is fixed, providing good stability and safety during storage and deployment.

c. Because of its simple structure, it is easy to manufacture and inexpensive.

d When stored, it is stored vertically and thinly, so it is compact and does not take up much space.

e Since the width of the stairs does not affect the storage space, the width of the stairs can be made wider, which improves safety and workability when going up and down.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present invention, FIG. 2 is a folded perspective view of the present invention, and FIG. 3 is a sectional view of the tread hinge of the present invention. Reference numeral 1 is a fixed support girder, 2 is a movable support girder, 3 is a handrail, 4 is a cylindrical member, 5 is a shaft, 6 is a footboard, 7 is a positioning reinforcement, 8 is a lifting device connection locking device, 9 is a hook, 10 is a pulley, 11 is a wire rope winding machine,
12 is a wire rope, and 13 is a welded part.

Claims (1)

[Claims for Utility Model Registration] a. A fixed flattened girder 1 and a movable flattened girder 2 made of a structural material are screwed to an appropriate number of footboards 6 in a rotatable structure. b. A lifting device connection locking tool 8 is provided on the movable salsa girder 2. A folding staircase constructed as described above.