RU218947U1 - TECHNICAL LADDER OF TEMPORARY ACCESS - Google Patents

Abstract

The utility model relates to the field of construction, namely stairs, and is intended to provide temporary access to construction sites. The technical result of the proposed utility model is the automatic preservation of the parallel, relative to the lower support, position of the steps when the angle of inclination of the stairs changes. The technical temporary access ladder includes a double bowstring to which steps are attached, a fence, upper and lower supports, a double bowstring consists of a lower and upper bowstring, steps are movably attached to a double bowstring by means of L-shaped fastening, a fence consists of a handrail, handrail posts and crossbars movably fixed to each other, while the handrail posts are fixedly fixed on the steps and are made with the ability to maintain an angle of inclination relative to the steps of 90 °, and the handrails and the crossbar are made with the possibility of a constant parallel arrangement relative to the double bowstring, which is equipped with a locking lock, and the lower and upper the supports are movably connected to the lower and upper bowstrings, respectively, and include rigging loops.

Description

The utility model relates to the field of construction, namely stairs, and is intended to provide temporary access to construction sites.

Known modular ladder, including the first section of the ladder, having a plurality of steps, and the first support element, removably connected to the first section of the stairs, the second ladder module, having a second section of the ladder, including a plurality of steps, and the second support element, removably connected to the second section stairs and with the first support element, the third module of the stairs, having a third section of the stairs, including a plurality of steps, and a retractable third support element, removably connected to the third section of the stairs and with the second support element, the third support element can be made with the possibility of lifting or lowering the third section of the ladder relative to the second section of the ladder (patent No. US10532827B2, B64F1/315, op. 01/14/2020).

The disadvantage of the known staircase is that it cannot change the angle of inclination while maintaining the horizontal arrangement of the steps.

Known ladder, which consists of a frame and steps, while the steps consist of movable boxes connected to the frame with bushings that move along the guide frame to change the distance between the steps, while the steps are made with the possibility of fixation on the frame with locking screws (patent No. 2671274, E06C1/06, op. 30.10.2018 Bull. No. 31).

The disadvantage of the known staircase is that it cannot change the angle of inclination while maintaining the horizontal arrangement of the steps.

Known ladder, which can be installed in any finished openings while maintaining the horizontal position of the tread at any angle of the ladder. To give a horizontal position, the steps must be fixed with fixing bolts on each tread on both sides, at the required height. It is necessary to repeat these manipulations each time the ladder moves to a support with a different angle of inclination (patent No. 2144122, E04F 11/02, op. 10.01.2000 Bull. No. 1).

The disadvantage of the known staircase is that when changing the angle of inclination of the support, all the steps on both sides must be re-adjusted and fixed with a hand tool and a building level.

The technical result of the proposed utility model is the automatic preservation of the parallel, relative to the lower support, position of the steps when the angle of inclination of the stairs changes.

The specified technical result is achieved by a ladder of technical temporary access, including a double bowstring to which steps are attached, a fence, upper and lower supports, a double bowstring consists of a lower and upper bowstring, steps are movably attached to a double bowstring by means of an L-shaped attachment, the fence consists of handrail, handrail posts and crossbar movably fixed to each other, while the handrail posts are fixedly fixed on the steps and are configured to maintain an angle of inclination relative to the steps 90 ⁰ , and the handrails and crossbar are configured to be permanently parallel with respect to the double bowstring, which is equipped with a locking lock , wherein the lower and upper supports are movably connected to the lower and upper bowstrings, respectively, and include rigging loops.

Double bowstring with movable fastening of supports, steps with L-shaped fastening, movably attached to a double bowstring, movable fencing structure, fixedly fixed on the steps with brackets, make it possible to automatically maintain the horizontal position of the steps, parallel to the plane of the lower support and automatically maintain the position of the handrails parallel to the double bowstring when changing the angle of inclination from 0° to 50°. The locking lock prevents folding, and lifting eyes allow you to move the ladder around the construction site and bring it into working position.

This allows you to use the same ladder repeatedly when climbing to heights with different levels of inclination, from 0 ° to 50 °, and also use it as a bridge when crossing a trench.

In the attached Fig. 1 shows a general view of the ladder in the position of lifting to a height with an angle of inclination of 50°, in Fig. 2 - in a horizontal position with an angle of inclination of 0°, in Fig. 3 - step with L-shaped fastening.

The ladder consists of a double bowstring - lower 9 and upper 10 - on each side, to which steps 3 are attached. Supports are fixed at each end of the stairs, lower 7 and upper 8. Step 3 has an L-shaped mount 12 (bracket), with which step 3 is bolted movably attached to the lower 9 and upper 10 bowstrings.

For safety, the staircase has a railing, which consists of several bolted elements movably fixed to each other: welded handrail 1, handrail posts 4 and crossbar 11. Handrail posts 4 are fixedly fixed with mounting brackets 2 on steps 3. This allows the handrail posts 4 not to change the angle of inclination relative to the steps 3. Thus, when the angle of inclination of the stairs is from 0° to 50°, the steps 3 automatically become parallel to the plane on which the lower support 7 is placed, and the handrail posts 4 are always located in relation to the steps 3 at an angle of 90°. At the same time, due to the movable bolt fastening, the handrails 1 and the crossbar 11 always remain parallel to the lower 9 and upper 10 bowstrings.

To prevent the ladder from folding, a locking lock 5 is provided. For reliable fixation on the plane, the lower 7 and upper 8 supports are provided, which are also movably connected to the lower 9 and upper 10 bowstrings by bolted connections. The length of the ladder module can be from three (1487mm) to eighteen (5535mm) steps. Access to a greater height is achieved by adding an additional ladder module with the fixing of vertical retaining supports. The width of the stairs depends on the width of the steps 3 and can be 700 or 900 mm. To move around the construction site, four lifting loops 6 are provided, located in the upper and lower parts of the stairs.

The device works as follows.

Guardrails are attached to the steps 3 of the stairs in a horizontal position - a welded handrail 1, handrail posts 4 and a crossbar 11. Further, behind the lifting loops 6 located in the upper part, the edge of the stairs rises to the desired height and the upper supports 8 are lowered / fixed on the surface. This may be a slope of the earth, a floor slab and other places where access must be provided. The lower supports 7 remain fixed on the plane. To prevent folding, the double bowstring - lower 9 and upper 10 - is fixed on both sides with locking locks 5.

A multifunctional metal ladder with the ability to change the angle of inclination with automatic preservation of the position of the steps, parallel to the plane of the lower support, was developed as an alternative to wooden and welded metal temporary ladders widely used on construction sites. In the folded (horizontal) position it can be used as a bridge over a trench, in an inclined position it serves to rise to a height of up to 5535mm - the height of the maximum possible module of 18 steps. The ladder is made of steel 3 mm thick. The lower 7 and upper 8 supports are made of 5mm steel.

Claims (1)

Technical temporary access ladder, including a double bowstring to which the steps are attached, a fence, upper and lower supports, a double bowstring consists of a lower and upper bowstring, steps are movably attached to the double bowstring by means of L-shaped fastening, the fence consists of a handrail, handrail posts and crossbars, movably fixed to each other, while the handrail posts are fixedly fixed on the steps and are made with the ability to maintain an angle of inclination relative to the steps of 90 °, and the handrails and the crossbar are made with the possibility of a constant parallel arrangement relative to the double bowstring, which is equipped with a locking lock, and the lower and the upper supports are movably connected to the lower and upper bowstrings, respectively, and include rigging loops.

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