PL167959B1 - Collapsible ladder - Google Patents

Abstract

Folding ladder, characterized by that it has two sides of the same size (1,2) articulated and split longitudinal joints for external belts (4) and a central flange (5) of which the middle strip (5) in the wall (1) connected is the joint (8) with the bracket (6), and the outer belts (4) are articulated with the element above it (9), provided on one of its edges into the seat (11) of the hitch (7) and with the wedges (12), while the central strip (5) and outer straps (4) are connected in the wall (2) articulated with fittings - steps (13).

Description

The invention relates to a foldable ladder.

So far is known from the description of a provisional patent PRL 87 301 folding ladder with a platform which has a tripod structure inflatable shell a gas tight connected to the horizontal, the inflatable cylinders, inflatable cylinder upper and inflatable ring railing, which is connected to an ^e TTZ nsdmuhhiwtnys omoostern ódnnys walees ooaz ttójnogiem with the help of tensioning lines. Flexible steps attached to a tripod are used to enter the platform. The tripod is divided by gas-tight partitions in such a way that at a given height they form one inflatable space with the horizontal cylinders connecting them. the inflatable stiffness creates comfortable conditions for treading.

The disadvantage of the described solution is the low durability and stability of the structure due to the possibility of easy damage to the gas-tight coating of the ladder, and thus a threat to the safety of its user.

The foldable ladder according to the invention is characterized by the fact that it has two walls of the same size, each connected by pezububoso and szłtyyysi pezubamasi for the external belts and the middle belt, of which the middle belt in one of the walls is jointly connected to the bracket, while the external belts are articulated with an element located above the fitting, provided on one edge with a catch socket and with wedges, while the central belt and external belts in the other wall are articulated with the fittings - steps. The outer strips have the shape of a thiafuremtago quadrilateral, the central stripe has the shape of a trapezoid with a shorter base located on the edge common to both walls, while the brackets and fittings - steps are profiled into a trapezoid with a longer base in an elliptical shape.

The advantage of the proposed solution is a simple structure based on only one type of connection of elements, which allows the use of plastics for the production of the ladder, its small dimensions when folded, lightness and full comfort and safety of use.

The subject of the invention is shown in the embodiment in the drawing, in which fig. 1 shows the folded-out ladder in top view, and fig. 2 shows the ladder in the working position in perspective.

As shown in the drawing, the ladder consists of walls 1 and 2 of the same size in the shape of a flat multiplicity ^, articulated together along one of the short edges 3. Each of the walls 1 and 2 is divided by longitudinal joints into belts 1 and 5, the outer the lanes 4 have the shape of a thiafurted quadrilateral, while the central lane 5 has a shape

167,959 of a trapezoid with a shorter base located on the edge 3. In the wall 1, the central strip 5 is provided with a bracket 6 with a catch 7, which is shaped into a trapezoid with a longer base in the elliptical shape. The bracket 6 is connected to the belt 5 by a hinge 8, located parallel to the edge 3. The element 9 located above the bracket 6 is connected to the belts 4 by diagonal joints 10 and in the working condition of the ladder it acts as a shelf. One of its edges has a socket 11 of the catch 7, located in the symmetry axis of the wall 1. At the wall 1, at the edge 3, the outer strips 4 are equipped with wedges 12, in which the longer side and the hypotenuse are articulated, the middle strip 5 in the wall 2 is divided into parts with fittings - 13 steps, profiled in the form of a trapezoid with a longer base in the elliptical shape. When located above the fittings - steps 13, the parts 14 have a trapezoidal shape, the longer base of which has the shape of an elliptical recess. On the other hand, the part 15 located at the outer edge of the wall 2 has the shape of a regular trapezoid. Fittings - steps 13 are articulated with the central belt 5 and with external belts 4.

FIG. WITH

167 959

FIG. 1

Publishing Department of the UP RP. Circulation of 90 copies. Price PLN 1.50

Claims (2)

Patent claims 1. Folding ladder, characterized in that it has two walls of the same size / 1, 2 / articulated and divided by longitudinal joints into external belts / 4 / and a central belt / 5 /, of which the middle belt / 5 / in the wall / 1 / is connected by a joint / 8 / with a bracket / 6 /, and external straps / 1 / are articulated with an element / 9 / located above a mm, provided on one of the edges with a socket / 11 / of a catch / 7 / and with wedges / 12 /, while the central strip / 5 / and the outer strips / 4 / in the wall / 2 / are articulated with fittings - steps / 13 /. 2. DrabinkD according to claim and, characterized by that the outer strips / 4 / have the shape of a different quadrilateral, the central strip / 5 / has the shape of a trapezoid with a shorter base located on the edge / 3 /, while the bracket / 6 / and fittings - the steps / 13 / are profiled into a trapezoid with a longer elliptical base.