AU785222B2 - Multi-level trestle - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT MULTI-LEVEL TRESTLE The following statement is a full description of this invention, including the best Method of performing it known to me: TRUE COPY Description This invention relates to an improved scaffolding system that provides a heightadjustable plank attached to modular legs.

This invention was made as a result of problems I identified where trades-people need to undertake work at varying heights throughout a job, requiring them to use multiple trestles of various heights to perform their tasks.

"'*"Current scaffolding systems do not offer a single-system that offers a wide range of height adjustment, as well as being light, and easily stored and transported.

*These obstacles have been overcome in the present invention that provides a stable, fully detachable work platform with modular legs that can be adjusted for use at *heights between approximately 500mm and 1700mm inclusive and exclusive. This system is light, and folds flat for easy storage and transportation.

In one form of the invention the scaffold consists of a plank with six or more sets of fixing points (Refer drawing 1i; points These points form junctures for a pair of interconnecting legs and struts at each end. The strut leg connection can be adjusted to fit pre-fabricated fixing points on the leg to achieve various heights.

:i In its other form the invention comprises of a leg and strut slider arrangement that, attaches to the plank by a slider rail. The slide rail for the leg is built into, or onto the plank itself. The leg has a rail built onto it to enable it to interact with the strut at various points. By changing the positions of the main leg and the strut various heights can be achieved.

In both forms of the invention the folding legs house telescoping extensions that can be extended when the folding leg is at its maximum height. The strut is either attached to the plank with a permanent or detachable hinge.

The scaffolding system may be made in full or in part of any suitable material, such as electro-resistance welded hollow tube, rectangular-hollow sections steel, extruded aluminium, pressed sheet metal, injection moulded plastic or formed plastic sheet, composite plastic or wood.

To assist in the understanding of the invention, reference will now be made to the accompanying drawings, which show an example of the invention.

The dimensions on all drawings are nominal.

TRUE COPY In the drawings Drawing 1 Diagrams 1 and 2 show the trestle from its stored position to its third extended height.

Diagram 3 shows the full extension, plus the telescoping legs extended at nominal intervals.

Drawing 2 Shows the components of the clip-on design. Points, B and C are attachment points for the leg clip labelled point D. Points E, F and G on the leg are an attachment point for point I on the strut. Points A and H are interconnecting, connecting the strut to the plank. Point D attaches to either point B or C. Detail A is the means of connection between all points.

Drawing 3 Shows the components of the slide rail design. Points B and C are attachment points for the leg clip labelled point D. Points E, F and G on the leg are an attachment point S•for point I on the strut. Points A and H are interconnecting, connecting the strut to the plank. Point D attaches to either point B or C.

Drawing 4 Shows the means of connection between points I, E, F and G in Drawing 3, being the rail and the slider/lock mechanism. Points E, F and G answer to lugs cut out of the rail.

Drawing 25 Is an abstract of the multi-level trestle that shows positions 2 and 3 in Drawing 1.

Claims (2)

1. An adjustable scaffolding comprising of four telescoping, variable height adjustable supports assembled in pairs having an outer pipe and an inner pipe slidably mounted together and semi permanently fixed with pins or clamps along the length the outer pipes, as two pairs, forming two assemblies, called legs, that juncture a horizontal platform, called a plank, at their extremities with axes formed by a removable clip, a sliding rail and releasable clip or a sliding rail and threaded bolt passing through or underneath the said horizontal platform, the said horizontal platform having, at its own extremities, an axis each and the same from which hangs a frame each, called struts, that is able to rotate being secured by removable clips, threaded bolt or sliding detachable bolt, the said frames intersecting at their other extremities with the two assemblies S: 1 aforementioned at axial points prefixed on the said outer pipes, with releasable clips on a sliding rail, a sliding bolt or a releasable clip, the improvement wherein movement of the assemblies along the body of the horizontal platform at a plurality of prefixed points with the frame intersecting the said assemblies at the prefixed points of the operators 2 choosing along the outer pipes axis, coupled with the movement of the 20 inner pipes to prefixed positions of the operators choosing gives the operator the widest choice of height adjustments for the horizontal platform.

2. An adjustable scaffold as herein described with reference to the drawings oooo oooo