Method and apparatus for forming stringers for free-standing cir

Details Method and apparatus for forming stringers for free-standing cir Method and apparatus for forming stringers for free-standing cir

1989-04-10

1990-04-24

Bray, W. Donald

Metal working

Method of mechanical manufacture

Assembling or joining

52187, 1442562, 144344, 144345, 144349, 156443, 269904, B23Q 300, B27H 100

Patent

active

049187996

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.

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