×

Curvilinear stairway constructions

  • US 4,527,366 A
  • Filed: 12/21/1981
  • Issued: 07/09/1985
  • Est. Priority Date: 12/21/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. A prefabricated curvilinear stairway construction for mounting to curvilinear walls of differing radii of curvature comprising:

  • first and second stringers of a given length each comprising longitudinally extending elongate members having inner and outer planar faces and which are substantially straight over their length, but which are bendable to assume a curvature over their length which is substantially concentric to the curvature of the wall to which the stairway construction is to be mounted;

    a plurality of steps having inner and outer ends;

    first mounting means mounting the outer ends of said steps to said inner planar face of said stringers at locations spaced from each other and the ends of said stringers along the length of said stringers;

    said bendable, substantially straight given length stringers bending substantially uniformly over their length such that, together with the outer ends of said steps which are mounted thereto, the planar faces of said stringers assume a curvature which is substantially concentric to the curvature of the curvilinear wall to which the stairway construction is to be mounted when the inner ends of said steps are positioned in spaced relationship to each other along a curve which is also substantially concentric to the curvature of the wall;

    support means for supporting and fixing said inner ends of said steps in said spaced relationship along said last mentioned curve;

    second mounting means for adjustably mounting either the inner or outer planar face of the upper end of one of said stringers to the other opposite planar face of the lower end of the other stringer, said mounting means permitting adjustment of the ends of the bent curved stringers relative to each other to compensate for the curvature of said stringers when mounted to each other for curvilinear walls of differing radii of curvature; and

    elongate reinforcing means formed integrally with said stringers and projecting from at least one of the planar faces of said stringers along at least one edge thereof, said reinforcing means along at least one edge of one of said stringers extending into overlying relationship with one of the planar faces of the other of said stringers, but away from the other of said stringers to permit the ends of said stringers to be adjusted and mounted in flush relationship to each other.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×