RU161712U1 - LADDER-SHEST - Google Patents

Abstract

1. A ladder, characterized in that it is made in the form of a pole, the lower end of which is pivotally mounted with a base with rotary shoes at the ends, two steps are located on the pole, made with the possibility of their movement along the pole, and at the top of the stairs there is an adjustable crossbeam for fixing a vertical position, with each step having a supporting platform with an element fixing the leg. 2. The ladder according to claim 1, characterized in that the pole is made of metal. 3. The ladder according to claim 2, characterized in that the pole is made telescopic folding or collapsible. 4. The ladder according to claim 1, characterized in that the element fixing the leg is made in the form of a loop for threading the toe of the foot. 5. The ladder according to claim 1, characterized in that it is equipped with a grab or hook attached to the upper part of the support post.

Description

The utility model relates to means for lifting and working at heights, for example, in construction, maintenance, rescue operations, etc.

In the prior art, various designs of telescopic ladders with one or more support legs are known.

So, from the description of US Pat. No. 3,02733 F (published July 29, 1884), a stepladder is known with one support post and cantilever crossbeams-steps located symmetrically on both sides of the support post and attached to its lower part via a hinged base. Using this design allows you to reliably install the ladder vertically on an inclined base. The disadvantage of such a ladder is its overall length, which complicates its transportation. Moreover, increasing the working length leads to difficulties in installing the stairs in a vertical position. It is difficult to make such a ladder in the telescopic version due to the presence of crossbeams-steps.

A significant drawback of portable stairs is the limited (3-5 cm) transverse width of the crossbeams-steps. Because of this, the user can not stand on the stairs and maintain balance without holding at least one hand on the support rack of the stairs. Thus, freedom of movement of both hands of the user and his safety are not ensured.

A staircase is also known (US Pat. No. 3,968,858, published July 13, 1976), which comprises runners, upper elements mounted on them through the carriage to be gripped by their hands, lower elements also mounted on the carriages and intended to support the legs.

This design is dangerous, therefore it is not used without insurance.

The closest analogue to the patented solution is a climbing device containing a pole that can be mounted vertically or obliquely, an axially mounted movable element mounted on a pole for supporting the legs, and a second element axially located on the pole for supporting the hands. Both elements include brake pads interacting with the pole. The supports of both elements on the pole allow the pole to be mounted vertically or obliquely (US Pat. No. 4,301,891, published November 24, 1981).

The disadvantages of the known device are the insecurity of its use, instability, difficulty in using it due to the need to exert efforts to climb up the pole, i.e. such a ladder can be used by persons with good physical fitness.

The objective of the patented solution is to create a safe telescopic ladder-pole.

The technical result of the patented solution is to increase the safety of the user when using the stairs.

The claimed technical result is achieved due to the design of the ladder, made in the form of a pole (rack), the lower end of which is pivotally mounted with a base with rotary shoes at the ends, two steps are located on the pole, made with the possibility of their movement along the pole and fixing on the pole when they are loaded and at the top of the stairs there is a width-adjustable crossbeam for fixing the vertical position, with each step having a support platform with an element fixing the leg.

Thus, due to the presence of one pole, the lower end of which is pivotally fixed to the base with rotary shoes at the ends, two movable steps and a support platform with a foot-fixing element, the safety of the user is ensured.

The pole (stand) can be made metal and telescopic, folding or collapsible.

The foot-fixing element may be in the form of a loop for threading the toe of the foot.

The base is a crossbeam pivotally connected to the pole with rotary shoes at the ends, which allows installation on any, even uneven, surface.

In addition, the ladder can be equipped with a grip, or a hook attached to the upper part of the support stand.

Next, the solution is illustrated by reference to the figures, which show the following.

In figure 1 is a front view of the stairs;

In figure 2 is a view aa in figure 1;

In figure 3 is a side view of the stairs;

Figure 4 is a view of BB in figure 3;

Figure 5 - image of the climb to the standard stairs and patentable;

In figure 6 - scaffolding, assembled from two staircases-poles.

The ladder-pole consists of one telescopic support (or modular) rack (1), on which there are two mobile steps (2) for lifting and lowering with leg-fixing elements in the form of loops (9). A person climbs the stairs precisely because the mobile steps, in the loops of which the feet are inserted, move along the pole. The base of the ladder (4) is attached to the bottom of the support post (1) through an articulated joint (3). Each step has a step (5), rear (6) and front (7) support legs for supporting the support strut, which are rigidly interconnected. At the same time, the distance between the gripping supports (5) and (6) is several millimeters larger than the transverse dimension of the support column (1). In the absence of load, the steps move freely along the support strut, but under load, the step rotates slightly at an angle to the strut and is fixed on the support strut due to the friction forces between the strut (1) and the gripping supports (6) and (7).

Devices of this kind have a huge number of modifications, caused by the need to change the distance between the grips when changing the size of the cross section of a tree (column) as it ascends and descends (see, for example, US 20020092705 A1 (published on July 18, 2002), US 4137995 (published on 02.02 .1979) or AC SU 1030901 (published July 23, 1983)).

When using a mobile stage, working on a similar principle, there is no such need, due to the insignificance of the change in the cross section along the height of the support column. The presence of a full-fledged supporting platform (5) for placing the foot allows you to stand, bend, and crouch on the stairs without the support of hands, which is impossible on stairs of a traditional design. Moreover, since the user's legs are located on both sides of the support post, the center of gravity of the user is as close as possible to the support post compared to the location on a traditional staircase (see Fig. 2). This allows you to install a ladder-pole at much larger angles to the surface than the traditional one. And because the lateral load on the support column is proportional to the cosine of this angle, the closer the angle is to 90 degrees, the lower the lateral bending load. The consequence of this is that with a similar height of the staircase, you can use lighter support legs (or, inversely, with a similar rigidity of the support rack to increase the height of the lift).

Two transverse crossbars (8) are attached to the upper part of the pole-ladder (Fig. 1) to fix the vertical position of the ladder. To compensate for the moment of force with respect to axis A (3) arising at the initial stage of climbing the ladder, slopes (10) are provided that are fixed at one end on axis B (13) located on the support post (1) and the other on the base of the ladder (4) through sliding sliders (11) with clamps. To compensate for the angle of inclination of the stairs relative to the wall, rotary shoes (12) are provided.

The procedure for using the pole vault is as follows:

1. Install the base of the stairs on the surface.

2. Extend to the desired height and fix the support stand.

3. Insert into the belts (9) the mobile steps of the feet.

4. Carry out the ascent (descent).

On the basis of such stairs scaffolding can be assembled (see Fig. 6) with the possibility of movement along the height of the platform (15) for builders using additional carriage holders (16) (with the principle of operation similar to mobile steps). The rise of workers to the platform is carried out on mobile steps (17).

Claims (5)

1. A staircase, characterized in that it is made in the form of a pole, the lower end of which is pivotally mounted with a base with rotary shoes at the ends, two steps are located on the pole, made to move them along the pole, and at the top of the stairs there is an adjustable crossbeam for fixing a vertical position, with each step having a support platform with an element fixing the leg. 2. The staircase according to claim 1, characterized in that the pole is made of metal. 3. The ladder according to claim 2, characterized in that the pole is made telescopic folding or collapsible. 4. The ladder according to claim 1, characterized in that the element fixing the leg is made in the form of a loop for threading the toe of the foot. 5. The ladder according to claim 1, characterized in that it is equipped with a grab or hook attached to the upper part of the support post.

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