Louis C Benedetti

US Patent:

49187996, Apr 24, 1990

Filed:

Apr 10, 1989

Appl. No.:

7/335992

Inventors:

Louis Benedetti - Forest Hills NY

International Classification:

B23Q 300
B27H 100

US Classification:

29467

Abstract:

A structure on which stringers for a free-standing circular staircase are formed in accordance with a time-saving method is disclosed. The structure comprises upper and lower metal patterns connected by vertical beams. The patterns have a plurality of rays attached to a central hub. The beams are attached to equidistant rays at a given distance from the center of the respective pattern. Clamps are affixed at successively higher positions along the perimeter of the circle formed by the beams that hold the stringer while it is being laminated with epoxy resin, until it has become rigid. Separate sets of beams may be used to form inner and outer stringers for a staircase, or the outer stringer may be formed on the same set of beams after the inner stringer has become rigid.