DE29520679U1 - Device for connecting two single-rail ladder elements - Google Patents

Abstract

The invention relates to a device for connecting two one-rail ladder members (10, 12) which each have a central rail (14) and a number of steps (16). Said device includes a tongue (20) arranged at the end of the one ladder member (10), and coupling plates (28) which are arranged at the end of the other ladder member (12) and form a gap (30) therebetween for holding the tongue (20) which can be arranged on the rear of the central rail (14) and is in a plane defined by the longitudinal axis of the central rail (14). Said gap (30) between the coupling plates (28) may taper in the direction of insertion. A spring-loaded stop bolt (32) can lock in the gap (30) on the tongue (20) when it (20) is in its final position. Said tongue (20) can be secured to a plate (18) secured to the central rail (14). The coupling plates (28) can also be secured to a plate (26) secured to the central rail (14) of the other ladder member (12).

Description

_A1 . _o _ ,. W. Abitz

Abxtz & Partner ·::..:. ·; ■:. :”::... -

European Patent Attorneys .·«« ·. .« _t .... .« ... Dr. Dipi.^hem.

"Patent Attorneys _M# Gritschneder

Dipl.-Phys.

_&Lgr; A. Frhr. von Wittgenstein.

Dr. Dipl.-Chem.

J. Morf

Abitz & Partner, PO Box 86 01 09, D - 81628 Munich ^Dr · ^l

Postal Address / Postal Address PO Box 86 01 09 D - 81628 Munich

29 December 1995 29922/Tongue

Soll GmbH

Seligenweg 10, D-95028 Hof/Saale Federal Republic of Germany

Device for connecting two single-spar ladder elements

The invention relates to a device for connecting two single-spar ladder elements, each having a central spar and a number of steps.

To climb to workstations on high buildings that are not permanently occupied, assembly ladders with fall protection guide rails are used. These are temporarily hung, screwed or tied to the building (DE-GM 81 22 295). The ladder elements have two side rails between which a number of steps are arranged. At the upper ends of the rails there are tongues, onto which the next ladder element is placed. The connection between the individual ladder elements is largely rigid.

The invention is based on the object of creating a device for connecting two ladder elements, which has sufficient mobility both in the lateral direction and forwards and backwards so that the assembly ladder formed from the individual ladder elements follows the movements of a building structure, e.g. a tubular mast that stands on an unstable surface.

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According to the invention, this object is achieved in that a tongue is arranged at the end of one conductor element and coupling plates are arranged at the end of the other conductor element, between which the tongue can be fixed with a play of approximately 3°. 5

Preferably, there is a butt joint between the ladder elements, the tongue is arranged on the back of the central beam and points in the direction of the central beam and the coupling plates form a gap between themselves that narrows in the direction of insertion.

Preferably, the tongue is secured in the gap of the coupling plates by a locking bolt extending transversely to the coupling plates, wherein the locking bolt engages in a hole in the tongue.

Preferably, the tongue and the two coupling plates are each welded onto plates that are screwed onto the back of the center beam.

The connecting device according to the invention allows the two ladder elements to be tilted towards each other by approx. 3° forwards and backwards and to the side without causing tension at the joint between the ladder elements or at the fastening devices.

Normally the tongue is arranged on the lower conductor element and the coupling plates are arranged on the upper conductor element. However, the reverse arrangement is also possible.

To prevent the moving arrester from being accidentally extended, a spring-loaded locking bolt is provided at the upper end of the lower ladder element.

An embodiment of the invention is explained below with reference to the drawing.

Fig. 1 shows the two conductor elements at a distance from each other and Fig. 2 shows the two conductor elements in a connected state.

According to Figures 1 and 2, a lower ladder element 10 and an upper ladder element 12 each have a central beam 14 and steps 16. The central beams 14 have a C-profile that is open at the front, as is known from DE-PS 1 961 757, DE-OS 27 36 037 and EP-A-0 129 241. The central beam 14 also serves as a guide rail for a safety device to which the user of the ladder is secured.

At the upper end of the lower ladder element 10, a plate 18 is screwed to the back, which protrudes slightly over the blunt end of the lower ladder element 10 and onto which a tongue 20 is welded at right angles and pointing backwards. The tongue 20 lies in a plane defined by the longitudinal axis of the central beam 14. The tongue 20 has a flattened area 22 at the upper end and also a hole 24 in the upper area.

At the lower end of the upper conductor element 12, a plate 26 is also screwed to the back, which is set back from the end of the upper conductor element 12 by the amount by which the plate 18 protrudes beyond the upper end of the lower conductor element 10. Two coupling plates 28 are welded to the plate 26 at right angles and projecting backwards, the lower halves of which are angled away from each other so that they form a gap 30 that opens downwards between them. A spring-loaded locking bolt 32 is attached to the side of one of the coupling plates 28, which is pressed into a securing position in the gap 30 by means of a spring (not shown in detail). The locking bolt 32 is pressed back into the gap 30 by the flattening 22 on the tongue 20 when the tongue 20 is pushed in. As soon as the tongue 20 has reached its final position in the gap 3 0, where the ends of the lower and upper

conductor elements 10, 12 abut each other, the locking pin 32 engages in the bore 24.

When plugged together, the ends of the conductor elements 10, 12 butt against each other and the tongue 20 lies in the gap 30, with the locking pin 32 engaging in the hole 24 of the tongue 20. The play of the tongue 20 in the gap 30 is selected in relation to the length of the gap 30 so that an inclination of about 3° is possible to the front, back and sideways without any tension occurring at the connection point.

There are also lateral bends 34 on the plate 18, which rest laterally against the central beam 14. Furthermore, a spring-loaded locking bolt 36 is provided on the plate 18 below the tongue 20, which is intended to prevent the moving safety gear from being accidentally extended.

Claims (4)

PROTECTION CLAIMS 1. Device for connecting two single-spar ladder elements {10, 12), each having a central spar (14) and a number of steps (16), characterized by a tongue (20) arranged at the end of one conductor element &iacgr;&ogr; (10), - by coupling plates (28) which are arranged at the end of the other conductor element (12) and form between them a gap (3 0) for receiving the tongue (20). 2. Device according to claim 1, characterized in that the tongue (20) is arranged on the back of the central beam (14) and lies in a plane defined by the longitudinal axis of the central beam (14) and that the gap (30) between the coupling plates (28) narrows in the insertion direction. 3. Device according to claim 1 or 2, characterized by a spring-loaded locking bolt (32) which, in the end position of the tongue (20), engages in the gap (30) on the tongue (20). 4. Device according to one of claims 1 to 3, characterized in that the tongue (20) is fastened to a plate (18) which can be fastened to the central beam (14) and that the coupling plates (28) are fastened to a plate (26) which can be fastened to the central beam (14) of the other ladder element (12).