Self-supporting unit element staircase
OwnerWilfred Hamminventor
Life of this patent
Estimating the term…
Abstract
Self-supporting unit element staircase consisting of linking elements of steel tube shaped by bending into a U-form and which lie at right angles to the line of the stairs. These linking elements are connected together at their upper, open ends by means of handrail parts, which are also of steel tube and have been shaped by bending and which have a coupling sleeve welded on transversely at one end. At their lower ends, the linking elements are connected together by means of the steps, which have pipe clamp fittings at their four corners. Two different step shapes permit every desired form of flight of stairs to be constructed.
Claims7
A staircase comprising a plurality of U-shaped supporting elements, each element having a horizontally extending base and vertically upwardly extending legs integrally connected to the base, a plurality of steps having opposed ends and marginal edges between said opposed ends and said marginal edges are longer than said opposed ends, means for clamping said step ends of each step to the legs of at least two of said U-shaped elements so that each step is supported above both bases of said two U-shaped elements with said step marginal edges parallel said elements bases, said U-shaped elements being spaced vertically one relative to another so as to define a predetermined pitch or rise for successive steps in the staircase.
Dependencies are inferred from the claim text.