Convertible ladder

DETAILED DESCRIPTION I claim: 1.
A convertible ladder comprising two leg assemblies each comprising a pair of sides joined by a plurality of rungs, pairs of regularly spaced hooks on each leg assembly the length thereof, a plank member including end lugs engaging in a pair of hooks on each leg assembly, said plank member further including arms provided with lugs engaging in another pair of hooks on each leg assembly, a pair of bridging members respectively pivotally mounted on the sides of one leg assembly at the upper end thereof, each bridging member having a slot at each end thereof, pins on corresponding upper end parts of each side engaging in said slots, catch members pivotally mounted on said bridging members so as to overlie the slots in said bridging members and fit over said pins to prevent the bridging means slots from disengagement from said pins.
2.
A ladder as claimed in claim 1 wherein one leg assembly has a further pair of hooks to engage a rung of the other leg assembly when the leg assemblies are placed in overlying relationship to form an extension ladder configuration.
3.
A ladder as claimed in claim 1 including tie means to limit maximum angular deviation between the leg assemblies.
4.
A ladder as claimed in claim 1 having the lower portion of each side of each leg assembly splayed outwardly.
5.
A ladder as claimed in claim 1 wherein the component parts are made of metal.




Description:
This invention relates to a convertible ladder.
It may take up an extension ladder form, a step ladder form or a trestle form.
The invention is primarily concerned with the provision of the trestle form although not limited thereto.
Trestle arrangements are known in which a plank is end supported on two spaced apart "horses" or is end supported on two spaced apart step ladders or is end supported on other items.
The main problems with all the foregoing are that the arrangements lack versatility and are inclined to instability.
The present invention provides a ladder which is versatile and which when in trestle form overcomes the foregoing problems of known trestle arrangements