RU2096574C1 - Foldable stepladder - Google Patents

Abstract

FIELD: portable stepladder used for works on loose and uneven ground. SUBSTANCE: stepladder has ladder sections pivotally connected one with another. Each section has poles and central support pivotally connected by risers and struts. Stepladder has additional supports pivotally connected one to another with their central portions between poles and to lower parts of poles with their mid portions. In operating position additional supports rest upon ground at an angle to it. EFFECT: increased safety during working in hindered conditions or on uneven ground. 3 cl, 12 dwg

Description

 The invention relates to the field of designing folding portable stairs designed to work on loose and uneven ground.

Known staircase, consisting of two parts, with steps, on one of the racks of which is mounted with the possibility of rotation of the support [1]
This staircase in working condition has a fairly stable position, but has significant dimensions, which is crucial when used in cramped conditions.

A folding ladder is also known, including a ladder section consisting of uprights and steps, a rotary device attached to it and two props, hinged to it on a common axis with the possibility of separation to the sides [2]
In stairs of this type, a stable position is achieved, but it is rather cumbersome and difficult to install in the working position.

In addition, a step-ladder is known that includes pivotally connected to each other in the upper parts of the stair sections, consisting of racks and a central support, pivotally connected to each other by means of half-steps and props [3]
This embodiment of the ladder, although it takes into account the weaknesses of the last design, but does not provide a stable position in working condition, is rather cumbersome and difficult to bring into working condition, and is also not intended for installation on an uneven surface.

 The objective of the present invention is to avoid the aforementioned difficulties and to create such a design of a folding ladder, which, with the relative simplicity of the design, would provide increased safety when working on uneven surfaces and when working in cramped conditions.

 This is achieved due to the fact that the folding ladder includes pivotally connected stair sections, consisting of racks and a central support, pivotally connected to each other by means of half-steps and supports, provided with additional supports pivotally connected to the lower parts of the racks with their middle parts, and these additional supports are interconnected by a hinge, which is located between the racks. In addition, the hinge connecting the additional supports is rigidly fixed to the central support, and one of the supports can be made of variable length.

 In FIG. 1 shows (schematically) a side view of a staircase in a folded (transport) state; in FIG. 2 in an intermediate state (between folded and disassembled); in FIG. 3 disassembled; in FIG. 4 type of stairs in working condition; in FIG. 5 isometric view of the stairs; in FIG. 6 shows a staircase when folded; in FIG. 7, section AA in FIG. 6; in FIG. 8 section of the stairs in a disassembled state; in FIG. 9 node 6 in FIG. eight; in FIG. 10 node B (option 1) in FIG. eight; in FIG. 11 node B (option P) in FIG. eight; in FIG. 12 depicts a stair support on an uneven surface.

 The folding ladder consists of sections 1 and 2, made in the form of racks 3 6 (Fig. 1 6, 8) and central supports 7, 8, interconnected by half steps 9 14 (illustration is an example of one section) and hinges 15 26, as well as props 27 and 28 and additional supports 29 and 30.

 The supports 27 and 28 by means of hinges 31-34 are connected with the uprights and the central support 7 (Fig. 8, 9).

 Additional support 29 and 30 (Fig. 5, 8, 10, 11) are interconnected by a hinge 35 (Fig. 10) according to option I or by hinges 36 and 37 (option II) through a cracker 38 (Fig. 11) with a central support 7 Additional supports 29 and 30 with their middle parts through hinges 39 and 40 are connected to the lower parts of the uprights 3 and 4.

 One of the additional supports 29 (Fig. 12) or 30 (or both) are made of variable length, for example telescopic (retractable or screwed out).

 On the central support 7 (8), crackers 41 43 are rigidly fixed with a certain distance (equal to the step of the steps 9-14), and crackers 44 are mounted on the support 7 with the possibility of axial movement. Rusk 44 by hinges 32 and 33 is connected to the supports 27 and 28.

 For convenience, the sliding sections of the ladders are provided on the side surfaces of the uprights 3 6 of the handle 45 and 46 (Fig. 6), and to fix the sections 1 and 2 in the working position, the stops 48 and 49 are pivotally connected in the middle part by the hinge 47 (Fig. 4 6) with the support of one on the other at the location of the hinge 47.

 Sections 1 and 2 are connected in the upper part by uprights 3 to 6 by hinges 50, 51 (Figs. 4, 6, 8).

 The upper parts of the struts 3 6 and the lower parts of the additional supports 29 and 30 are provided, for example, with elastic supports 52 59 (Fig. 8).

 A folding ladder is transported to the installation site in the position shown in FIG. 1 and 6, 7; after determining the installation location for the handles 45, 46, the racks 3, 5 and 4, 6 are pushed to the sides to the position shown in FIG. 3 through FIG. 2.

 In this case, the half-steps 9-14 will occupy a horizontal position, as shown in FIG. 3, 5, 8, and the lower 13 and 14 with a cracker 43 rest on a cracker 44 connected to the supports 27 and 28.

 Additional supports 29 and 30 (Fig. 10) with their elastic parts 52 59 interact with the supporting surface.

 If the surface supporting the staircase is uneven in FIG. 12, the length of one of the supports 29, 30 is reduced to the required value to maintain the vertical position of the stairs.

 Sections 1 and 2 are moved apart and fixed by stops 48 and 49 in the required working position (see Figs. 4, 5 and 8). After the work done with the stepladder is completed, it is folded into the position of FIG. 1, 6, 7 and transferred to a new place of work.

 This embodiment of the stepladder allows you to increase the safety of its use, especially in cramped conditions and on uneven surfaces.

Claims (3)

 1. Folding step ladder, comprising ladder sections pivotally connected to each other in the upper parts, consisting of racks, half-steps, a central support and props, which are pivotally interconnected, characterized in that it is provided with additional supports pivotally connected to the lower parts of the racks, which interconnected by a hinge located between the racks.  2. The staircase according to claim 1, characterized in that the additional supports are hinged to a central support.  3. The staircase according to claim 1, characterized in that at least one of the additional supports is made of variable length.

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