SU1280103A1 - Extensible ladder - Google Patents

Abstract

The device is intended for: lifting people to the floors of buildings and structures under construction, and can also be used in other areas. The aim of the invention is to improve the reliability of operation and safety during operation. The device comprises rods made of a pre-tensioned spring tape, wound into a roll on a common shaft of the mechanism for winding and unwinding the tape and crossbar. Rings rigidly attached to the ends of the crossbar are capable of moving along the rod. I wherein the rings are interconnected by locking cables. 2 Il. SL

Description

The invention relates to construction and can be used to lift people to the floors of buildings and structures, as well as to be used in other areas.

The aim of the invention is to improve operational reliability and safety during operation.

Fig, 1 shows the extendable ladder, a general view; Fig. 2 illustrates a mechanism for winding and unwinding a retractable ladder;

The ladder includes rods 1 and 2, made of a pre-tensioned spring strap, wound into a roll 3 on a common shaft 4, the rolls of tapes, respectively, are housed in housings 5 and 6, to which is attached the base of ladder 7 with a crossbar 8. Housings 5 and b rigidly attached fixed rings 9 and 1 On the lower crossbar, rings 11 and 12 of the upper crossbar rigidly attached to the upper ends of the rods 1 and 2, the rods 1 and 2 are connected by movable crossbars 13. To the ends of the latter are rigidly attached moving along the rods 1 and 2 rings 14 and 15. The rings 14 placed on the rod 1 and the rings 15 placed on the rod 2 are interconnected by locking cables 16.

The ladder winding and unwinding mechanism housed in housings 5 and 6 includes a common shaft 4 with a handle 17, rolls 18 with a tape of fabric 19 wound on a common shaft 20 equipped with a ratchet wheel 21, a locking pawl 22 fixed on the axis 23, at the end of which is reinforced handle 24.

In the off position of the springs la tape 2 along with a tape of cloth 19

wound on a roll on a common shaft 4,

The unwinding of the ladder occurs by rotating the shaft 20, while the ribbon of fabric 19 is wound into a roll 18 on the shaft 20, and the spring tape 2, unwinding from the shaft 4 under the action of elastic forces, rolls into a tube and moves out of the housing 6, while the rings 11 and 12 of the upper crossbar using fixed cables 16 attached to the rings 14 and 15, alternately move the crossbar 1 3.

15

The use of the invention enhances the reliability and safety of operation of the ladder due to the fact that the load force (human mass) is perceived mainly by fixing cables, {and high mechanical tensile strength and only slightly by spring straps (rods) that do not work well.

compression.

Formula 1 acquisition

Sliding ladder containing

30 bars made of a pre-tensioned spring tape, a mechanism for winding and unwinding a tape and a crossbar, so that, in order to improve reliability and operational safety, the crossbar is provided with rings on the ends through which the spring is slipped with slippage, with

40 this staircase is made with a fixing cable rigidly attached to the rings and to the body of the mechanism for winding and unwinding the tape.

23 2

17

FIG. 2

Claims (1)

Formula and goiter A retractable ladder, rods made of but strained spring tape, a mechanism for winding and unwinding the tape and the crossbar, which requires that, in order to increase reliability in operation and safety during operation, the crossbar is provided at the ends with rings through which a springy tape with the possibility of slipping is skipped, while the ladder is made with a fixing cable, rigidly attached to the rings and to the body of the mechanism for winding and unwinding the tape. containing pre-