DE29821356U1 - Stabilizing supports for fixed and single ladders - Google Patents

Description

H.L.-Sheet-2-

Stabilizing supports for trestle and lean-to ladders

Stabilizing supports for ladders are well known. They prevent large, free-standing step ladders from swaying sideways or tipping over. When mounted on long extension ladders, stabilizing supports reduce the swinging of the ladder and the risk of tipping sideways.

All previously known designs of stabilizing supports have in common that either the angle of the support cannot be adjusted or locked because the connecting rods acting as tension-compression struts are not designed to be adjustable in length, or they are not present at all and only anti-spreading devices in the form of ropes or belts are used. Some designs have ground spikes at the ends, which do not provide the required stability in soft ground. Some designs do have connecting rods acting as tension-compression struts, e.g. in patent application DE-197 01 497.6 or DE-197 18 702.1, but have the disadvantage that the connecting struts must be hooked onto both ladders of an unfolded stepladder and connected to the stabilizing support in order to prevent the stabilizing support from slipping on all sides.

The arrangement of the second tension and compression strut on the opposite support ladder is not suitable for simple leaning ladders. As no other arrangement of the second tension and compression strut is known to date that reliably prevents the stabilizing support from slipping, it is not used.

However, a second tension-compression strut is absolutely necessary for the secure stability of a stabilization support, so that the ladder can be raised if necessary and the stabilization support does not change its position.

The innovation is now evident in the fact that the tension and compression struts Fig. 1 (2 and 3) are hinged in pairs parallel to the long sides of a stabilizing support (1) and can be folded in and out.

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·*··. H. L. - Sheet - 3 -

Stabilizing supports for trestle and lean-to ladders

are designed to be secured and lockable. A stabilizing support (1) forms a unit with two folded tension-compression struts.

Another innovation is the arrangement of the tension and compression struts (2) and (3) in the "operating state".

Both tension and compression struts (2 and 3) are hooked onto the outside of the ladder stiles on only one part of a trestle ladder, with the tension-compression strut (3) running past the back of the ladder and hooked onto the more distant opposite ladder stile. The tension-compression strut (2) is hinged to the nearest front ladder stile.

The advantageous arrangement of the tension-compression struts (2 and 3) makes use of the fact that two radii of different lengths whose pivot points are positioned offset (attachment points of the unfolded tension and compression struts (2 and 3) on the front and rear ladder rails), as well as a common intersection point of the imaginary circular line of the radii (articulated attachment of the tension/compression struts (2 and 3) on the stabilizing support) excludes a change in position of the intersection point (stabilizing support) because any separate circular movement of a tension-compression strut is prevented by the second tension-compression strut.

This simple but effective arrangement of the tension-compression struts (2 and 3) enables the stabilization supports, each equipped with two tension-compression struts (2 and 3), to be subsequently attached to ladders. Ground spikes and anti-spreading devices using ropes, etc. are no longer required. In addition, the angle of a stabilization support (1) can be individually adjusted in different directions and angles using the length-adjustable tension-compression struts (2 and 3).

The new arrangement of the tension-compression strut (3) also allows for an additional fastening option on an opposite tension-compression strut (3 a).

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Stabilizing supports for trestle and lean-to ladders

the tension-compression strut (3 a) is already hooked onto the long side of the opposite tension-compression strut (3) Fig. 1 over a part of the distance to the opposite ladder stile.

Another innovation is an automatically folding and unfolding foot plate (4) which is attached to the ladder foot of the stabilization support.

One type of execution is described as follows:

The stabilizing support (1) consists of a telescopic hollow profile and is attached to a stepladder at its upper end. In the lower third or half of the length of the stabilizing support, two length-adjustable tension and compression struts (2 and 3) are attached and designed to be folded in parallel.

In the lower area on both outside ladder stiles of a ladder or a ladder section of a trestle ladder there are eyelets into which the hooks of the unfolded tension and compression struts (2 and 3) of different lengths are hooked. On each opposing tension and compression strut (2 and 3) there is also a ring eyelet on an outer long side to alternatively accommodate the hook of an opposing tension and compression strut (2 and 3).

The foot plate (4) of the stabilization support (1) is angled on one side so that when the foot plate (4) is folded in (B) parallel to the stabilization support (1), the foot plate (4) folds over (A) when the angled end of the lever touches the ground while the stabilization support (1) is being extended. When the extendable bar of the stabilization support (1) is retracted, the foot plate (4) is folded in again parallel to the stabilization support (1) by means of a tension spring (5).

Stabilizing supports for trestle and lean-to ladders

List of reference symbols

Fig. 1 = Arrangement of the tension and compression struts (2 and 3, 3 a) on a stepladder, which is secured against swaying with stabilizing supports (1).

The tension and compression struts (2 and 3, 3 a) are attached to the stabilizing support (1) in an articulated manner and are only attached to one part of the stepladder. The advantage of the new arrangement of the tension and compression struts (2 and 3) can now be seen in order to reliably secure leaning ladders against slipping with the help of stabilizing supports (1), independently of ground spikes, spreader straps, etc.

Fig. 2 = Automatically folding and unfolding foot plate (4) of a stabilizing support (1).

A shows the support state and B shows the foot plate (4) folded in by means of a spring (5) in the unloaded state.

1 = Length-adjustable stabilizing support that can be folded parallel to the ladder rail

on each of whose long sides two tension and compression struts (2 and 3) are articulated.

2 = Tension-compression strut, which is hooked onto the nearest ladder stile.

3 = Tension-compression strut that runs past the back of the ladder and is hooked onto the opposite ladder stile.

3a = tension-compression strut, which is folded out from the opposite stabilizing support (1) and alternatively hooked onto the tension-compression strut (3).

4 = Base plate with angled lever end and spring balance

5 = Spring balance

Claims (4)

·.: :. &idigr; ····::: &eegr;. l.-Biatt-5- Stabilization supports for trestle and lean-to ladders Protection claims 1. Stabilization supports for trestle and lean-to ladders, each of which can be folded in and out on an outside of the ladder stile with its upper end running parallel to the ladder stile, is attached to the ladder stile in a lockable, articulated manner and allows for lateral swinging out at various adjustable angles, the stabilization supports (1) are designed to be length-adjustable and slipping of the unfolded stabilization supports (1) is prevented by two length-adjustable tension-compression struts (Fig. 1, 2 and 3), characterized in that two tension-compression struts (Fig. 1, 2 and 3) are each folded in and locked on the length-adjustable, articulated stabilization support (1) attached to the ladder, are designed to be telescopic, the tension-compression strut (2) is attached to the front, closest ladder stile side of a ladder section is hooked in the unfolded state and the tension-compression strut (3) is hooked into the same ladder section, but into the opposite ladder stile and is guided past the back of the ladder, or alternatively a tension-compression strut (3 a) can be clamped or hooked onto the already hooked tension-compression strut (3), or is hooked onto the opposite unfolded stabilizing support (1), thus reliably preventing the stabilizing supports (1) from slipping when unfolded on leaning ladders, regardless of ground spikes, spreader safety belts, etc. The foot ends of the stabilizing supports (1) have automatically foldable and unfoldable foot plates (4), the outside of which is provided with angled lever ends (4 A and B) and is held in position in the unloaded state by means of a spring tensioner (5) parallel to an outside of the stabilizing support (1). 2. Stabilization supports for trestle and lean-to ladders according to claim 1, characterized in that the tension and compression struts (2 and 3) can alternatively be clamped or hooked onto the ladder rungs and locked. • · ··:: : &eegr;.l.-Sheet-6- Stabilizing supports for trestle and lean-to ladders Protection claims 3. Stabilization supports for trestle and lean-to ladders according to claim 1, characterized in that the foot plate (4) is detachably constructed at the foot end of the stabilization support (1) and a spring-loaded brake roller can be inserted into the stabilization support and locked. 4. Stabilization supports for trestle and lean-to ladders according to claim 1 and 2, characterized in that the opposing tension and compression struts 3 and 3a can also be positioned parallel or in alignment, connected to one another in the unfolded state and only the tension and compression struts (2) are hooked onto the ladder.