Trap door and folding ladder arrangement
AssigneeArcia SA
InventorsFrancis Desarzens, Claude Cruchet
Life of this patent
Estimating the term…
Abstract
A trap door and folding ladder arrangement, suitable for use as a fire escape for multi-storey buildings, comprises a folding ladder which can be stored and locked in a folded position in a casing. A cover is connected to the ladder and the casing by two systems of levers and connecting rods arranged to automatically open the cover when the ladder is unlocked and unfolds by its own weight.
Claims3
A trap door and folding ladder arrangement comprising a casing able to receive the ladder folded in a storage position, the ladder comprising two uprights composed of rung-supporting pieces and intermediate pieces pivotally connected to one another to form an extensible folding structure, and a cover connected to the casing and to each upright of the ladder by a system of levers and connecting rods whereby the ladder when unfolding automatically actuates raising of the cover then moving it forward by a slight distance to free a rear edge of the cover from a corresponding side of the casing, and finally complete opening of the cover when the ladder is completely unfolded.
Dependencies are inferred from the claim text.