JPH0534244U - Stairs for scaffolding - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate smooth stacking of scaffolding stairs. [Structure] In a scaffolding staircase in which a large number of steps 4 are fixed between two parallel crosspieces 3 and 3, the facing surfaces of both crosspieces 3 and 3 are formed into flat surfaces, and both ends of step 4 are formed. The ridge 11 is provided outwardly on the ridge, and the ridge 11 is welded to a flat surface to fix the crosspiece 3 and the step 4. The flat surface can secure a sufficient amount of welding in step 4, and improves the strength. The step 4 projecting forward and backward between the crosspieces 3 becomes narrower than the facing interval of the crosspieces 3, and when the stairs are vertically stacked, the step 4 is fitted between the crosspieces 3 of the other stairs with a margin to stack the stairs. It can be done smoothly and without any problems.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to stairs used for temporary scaffolding.

[0002]

[Prior Art]

 In the frame temporary scaffolding, stairs are built in and used for going up and down with respect to the upper and lower floors formed by stretching the scaffolding board.

A conventional staircase is formed by fixing a large number of steps at a fixed interval between two pipe crosspieces having hooks fixed at both ends, and the steps improve stability during lifting and lowering. The front and rear dimensions of the tread are set wide, and the tread is fixed to the cross so that the tread is horizontal when the cross is tilted to a predetermined angle, and the tread is projected from the front and back of the cross.

[0004]

[Problems to be solved by the device]

 By the way, the stairs as described above need to be stacked and made low in volume during storage and transportation.Therefore, the steps of the stairs stacked one above the other are fitted between the cross members of the other stairs, and the cross members are I try to overlap.

However, since the conventional staircase has a structure in which the crosspieces are directly superposed on both ends of the step and fixed by welding, the distance between the facing surfaces between the crosspieces on both sides and the width dimension of the step. Are equal, it is difficult to fit the step between the crosspieces of the other stairs when stacking the stairs, and there is a problem that the stacking cannot be performed smoothly.

Therefore, in order to solve the above problems, the present invention sets the step width dimension to be shorter than the interval between the facing surfaces of the crosspieces, and inserts the steps between the crosspieces of the mating stairs. The challenge is to provide stairs for scaffolding that will be smooth and can be stacked smoothly.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the first invention is a stairway for scaffolding in which a large number of steps are fixed between parallel bars, and a cross section in which the bars on both sides have flat surfaces facing each other. Formed in a shape and provided with protruding ridges protruding outward at the positions facing the flat surface of the crosspiece at both ends of the step placed between both crosspieces, and the ridge and the flat surface overlap. It adopts a structure in which the crosspiece and the step are fixed.

A second invention adopts a configuration in which the crosspieces on both sides are formed in a semicircular cross section by using a circular pipe to deform a part of the peripheral wall under pressure and making the deformed part a flat surface. It is a thing.

[0009]

[Action]

 Since the overlapping portions of the bars and the bars provided at both ends of the step are fixed, the width of the part projecting in the front and back between the bars of the step is determined by the protruding height of the bars rather than the distance between the facing surfaces of the bars. However, when the stairs are stacked vertically, the steps are fitted between the crosspieces of the other stairs with a margin, and the stairs can be stacked vertically.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the staircase 1 includes two crosspieces 3 and 3 having hooks 2 fixed at both ends, and a large number of parallel crosspieces 3 and 3 fixed at regular intervals. Each step 4 is fixed to the crosspieces 3 and 3 so that the tread surface 5 becomes horizontal when the crosspieces 3 and 3 are inclined to a predetermined state.

The crosspieces 3 and 3 have a cross-sectional shape in which the surfaces facing each other in the state of being arranged in parallel on both sides are flat surfaces 6. In the case of FIG. 5, a circular pipe is used for both the crosspieces 3 and 3, and a flat surface 6 is formed on a part of the peripheral wall by deforming a part of the peripheral wall by pressurizing and deforming it to a semicircular shape. You may make it use the pipe of a cross section.

As shown in FIGS. 3 to 5, in step 4, a horizontally long tread 5 having a front-rear dimension on which a person can be stably placed, and a front wall 7 that is bent downward from a front edge of the tread 5. A side wall 8 that bends downward from both ends of the tread 5 and a rising wall 9 that rises upward from the rear edge of the tread 5 are integrally formed of a metal plate, and a large number of non-slip projections 10 are formed on the tread 5. It has a structure with ribs for reinforcement.

On both side walls 8 in the above step 4, mountain-shaped protrusions 11 projecting outward are formed by bending at a position of a substantially intermediate portion facing the flat surface 6 of the crosspiece 3. The crosspieces 3 and 3 and the step 4 are fixed by overlapping and fixing the tip of the strip 11 and the flat surface 6 of the crosspiece 3 by welding.

Two ridges 11 are parallel to each other, and as shown in FIG. 3, are provided so as to be inclined at an angle equal to the inclination of the crosspiece 3 with respect to the tread surface 5. It is fixed to the flat surface 6 along the length direction.

In step 4, the maximum width w along the length direction is the dimension between the tips of the two ridges 11, the distance w ₁ between the flat surfaces of the crosspieces 3, 3 is the maximum width w, and The width w ₂ of 5 becomes narrower by the amount of the ridge 11, so that there is a margin to fit between the crosspieces 3, 3.

The staircase 1 of the present invention is constructed as described above, and is installed between the upper and lower building frames of the temporary scaffold constructed using the building frame in an inclined manner using the hooks 2 at both ends, and step 4 is used. Then, move up and down the floors.

When storing or transporting the stairs 1, the stairs 1 are stacked as shown in FIG. At the time of stacking the stairs 1, in each step 4, the front and back portions between the crosspieces 3 and 3 are narrower than the interval between the crosspieces 3 and 3. The part projecting from the above will fit into the crosspieces of the mating stairs with a margin, so that the stairs 1 can be stacked smoothly and the upper and lower stairs 1 will be in a low bulk state with the crosspieces 3 overlapping.

When fixing the crosspieces 3 and 3 to the step 4, since the step fixing surface of the crosspiece 3 is the flat surface 6, the welding amount for fixing the step 4 should be secured sufficiently. Therefore, it is possible to obtain sufficient fixing strength between the crosspieces 3 and 3 and step 4.

[0020]

【effect】

 As described above, according to the present invention, the projections are provided at both ends of the step, and the projections and the flat surface of the crosspiece are fixed to fix the crosspiece and the step. The front and rear parts between the crosspieces are narrower than the space between the crosspieces, and when the steps are piled up and down, the step fits tightly between the crosspieces of the other stairs, and the vertical stacking of the arms is smooth. Can be done.

Further, since the step fixing surface of the crosspiece is a flat surface, it is possible to secure the amount of the welded portion for fixing the step and improve the strength of the stairs.

[Brief description of drawings]

FIG. 1 is a front view of a staircase according to the present invention.

FIG. 2 is a plan view of the same as above.

FIG. 3 is an enlarged front view of a step fixing portion.

FIG. 4 is a perspective view of steps.

FIG. 5 is an enlarged cross-sectional plan view of a step fixing portion.

FIG. 6 is a front view showing a stacked state of stairs.

[Explanation of symbols]

 1 stairs 2 hooks 3 crosspieces 4 steps 5 treads 6 flat surfaces 11 ridges

Claims (2)

[Scope of utility model registration request] 1. In a stairway for scaffolding, in which a large number of steps are fixed between parallel crosspieces, crosspieces on both sides are formed into a cross-sectional shape having flat surfaces on opposite surfaces and are arranged between the crosspieces. Scaffolds characterized in that projecting ridges projecting outward are provided at positions opposite to the flat surface of the crosspiece at both ends of the step, and the crosspiece and the step are fixed in a state where the ridge and the flat surface overlap. Stairs. 2. The scaffolding according to claim 1, wherein the crosspieces on both sides are formed in a semicircular shape by using a circular pipe to deform a part of the peripheral wall under pressure and making the deformed part a flat surface. Stairs.