Elements to be assembled to form temporary stair
OwnerGilbert Loixinventor
Life of this patent
Estimating the term…
Abstract
Elements to be assembled to form in situ a temporary stair, from a pair of planks (1,1') or longitudinally sawn boards, or identical cross-section, intended for serving as stringers and which elements consist of steps (2), identical with one another, the steps being self-locking one by means of another onto and against the planks (1,1'), with the exception of the top step which has to be wedged against these planks (1,1'); each step (2) rests, at each side at the front, on the upper edge of a plank and, at the rear, is brought against the lower edge of the plank by a pair of flats (14,14') terminating in a hook (16) and mounted freely pivotal in the step placed next above.
Claims7
A temporary stair, comprising a pair of planks of substantially identical cross-section, a plurality of steps substantially identical with one another, each step comprising at least two tubes extending between and connected to said planks, a plate engaging said tubes and forming a non-slip surface of the step proper, a plurality of check plates, the tubes being formed with reduced diameter ends, the check plates being formed with openings, and the reduced diameter ends being slid into said openings, two of said tubes being separated by a distance exceeding the width of the planks, a plurality of bushings each having a length exceeding the thickness of a plank, the bushings being held on the tubes, a plurality of bearing members respectively mounted on said bushings, each bearing member having a length slightly greater than the thickness of the planks, a plurality of flats respectively pivotally mounted at one end on one of said bushings and formed at the other end with a hook-shaped portion engageable with the bushing of the step placed next below, in such a manner that each step rests, at each side at the front, on a bearing member, another bearing member being pulled against the lower edge of each plank by a flat connected to the step placed next above.
Dependencies are inferred from the claim text.