SU878207A3 - Ladder - Google Patents

Description

(54) LADDERS

The invention relates to the construction, in particular to the construction of stairs from solid sheet metal. The closest in technical essence to the present invention is a solid sheet metal ladder, including steps with stems and edges, profiled bows and curved connecting sections between bows and steps whose width is less than the width of steps. The disadvantage of this solution is that that, to achieve the required stiffness of the ladder, it is necessary to use for its manufacture, a thick metal, which increases the consumption of materials and makes the ladder non-transportable. The purpose of the invention is to increase the bone gesture. The goal is achieved by the fact that in the staircase there are solid sheet metal, including steps with simple bars and edges, profiled bows and curved connecting sections between the chains and steps whose width is less than the width of the steps, connecting sections are made with grooves, and each stage is in the form of a hollow profile. The connecting area in the center is made with a hole. The grooves of the connecting section are located in the direction from the string to the step. In addition, the steps have edges on the edges. The bends of each step are rigidly interconnected along the line of contact and arranged at a right angle to each other. The grooves of adjacent connecting areas can be interconnected by a groove running along the string. The grooves of the connecting sections of one stage are interconnected by a groove running along the length of the stage. The step of the step is located below its edges and is made with flanged holes. Bowstring in cross-section can be made oval with limb, connected to each other overlapped. Fig. 1 shows a part of a sheet metal for the manufacture of a staircase in an intermediate processing stage, view; from above; Fig. 2 shows a ladder with various embodiments of the steps, a general view; on fig.Z - section aa in figure 2; figure 4 - ready staircase, view from below; on fig.Z - part of the connecting portion of the ladder with an oval bowstring.

 The ladder is made from a single sheet of metal, from which Bb Dv6aHiT part 1 is such that by deforming the remaining part of the sheet a ladder is obtained.

After punching, parts 1 are first pressed in by squeezing grooves 2 into the die, which serve to make the string rigid: both in the area between the steps and also in the connecting area between the string and the steps. Steps with edges 3 and tread 4, - are made of the remaining between the edge strips after cutting the parts 1 of the connecting part. connecting sections 5 and bends 6 stiffness. The bendings of stiffness 6 are bent along lines 7 and 8 backwards and bend them to each other until they come into contact with each other along line 9. The bends 6 of stiffness can be connected to each other by gear coupling or welding. The steps thus form a hollow profile.

The step 4 is formed in the form of a depressed cup, in which the upwardly raised beadings 10 are made, which perform the anti-skid function. Instead, the holes in the area below the tread may be provided with a slip resistant liner.

To form the strings 11, the edge bands of the solid sheet metal are folded several times and give them the appearance of a rectangular profile. Edge strips of solid sheet metal can also be given the appearance of an oval string 12, with limb running along the string 13.

The grooves 2 may end at the tread 4, located below the chrome 3, or may run along the edges 3, giving them additional rigidity.

An additional groove 14 may be provided, running through the connecting portion 5 and through the middle of the tread. An embodiment is provided in which, instead of the groove 14, a short groove 15 is performed, passing only in the region of the twisting axis through the connecting section 5. Instead of the short groove 15 on the connecting section 5 there may be | hole 16 is made.

The combination of grooves or grooves with a hole increases the rigidity of the stairs. The resulting stresses do not cause cracking or breakage of the material in the connecting section. ,

The width of the connecting section and the step, as well as the direction and distance of the grooves, are selected depending on the thickness of the sheet and on the requirements for the stairs in a particular case.

Claims (10)

Invention Formula Q 1. Stairs made of solid sheet metal, including steps with stems and edges, profiled bows and curved connecting sections between the bowstrings and steps whose width is less than the width of the steps, characterized in that the connecting sections are made with grooves, and each step is in the form of a profile, 2. The staircase according to claim 1, is distinguished by the fact that the connecting section in the center is made with a hole. 3. Ladder according to paragraph.n. 1 and 2, the difference is that the grooves 5 of the connecting portion are located in the direction from the string to the step. 4. Ladder according to paragraph.n. 1-3, this is due to the fact that the steps have bends on the edges. Q 5. Ladder according to cl. 1-4, characterized in that the bends of each step are rigidly interconnected. Along the line of contact. 6. Ladder according to paragraph.n. 1-5, that is, the tl is due to the fact that the bends of each step are located at a right angle to each other. 7. Ladder according to paragraph.n. 1-6, this is due to the fact that the grooves of the adjacent connecting grooves 0 plots are interconnected by gum passing along the string. 8. Ladder according to paragraph.n. 1-7, which means that the grooves of the connecting sections of one stage 5 are interconnected by a groove running along the length of the step. 9. Ladder according to the item p. 1-8, that is, the step tread is located below its edges and g is made with flanged holes. 10. Ladder according to paragraph.n. 1-8, about the aphid that the string in the cross section is made oval , with the limb, connected to each other overlap. Sources of information taken into account in the examination 1. For the application of the Federal Republic of Germany No. 2404108, cl. Е 04 В 1/24, published. 1975 (prs totip). eleven yy