Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1988-03-21
1989-05-23
Eley, Timothy V.
Metal working
Method of mechanical manufacture
With testing or indicating
52187, 52741, 29521, B23Q 1700
Patent
active
048317063
ABSTRACT:
A method of constructing a spiral staircase to the specifications of an architect comprising the steps of taking a plurality of flat rectangular sheets of metal and cutting the front edge at an angle to form the front edge of a tread. Then cutting a pair of stringers in the sheet of metal and bending the stringers downward until they are perpendicular to the tread. Then cutting a riser at the back of the sheet of metal and bending the riser upward. Once a plurality of sheets of metal are formed as outlined above they may be assembled by attaching the stringers of one sheet to the risers of another, forming a spiral staircase. A base for the staircase to rest on and attach the first step to should be employed. The base should be attached to the floor. The base may be made from a rectangular sheet of metal by cutting the front edge at the same angle as the front edge of the tread and then bending a front and rear support for the base in the sheet of metal. At the top of the stairs a plate should be attached to the floor and to the staircase to hold the staircase in place.
REFERENCES:
patent: D251805 (1979-05-01), Allmand
patent: 786431 (1905-04-01), DeWitt
patent: 3964222 (1976-06-01), Geleijnse et al.
patent: 4041662 (1977-08-01), Ward
patent: 4285178 (1981-08-01), Holzkampfer et al.
patent: 4296577 (1981-10-01), Schvette
patent: 4373609 (1983-02-01), De Donato
Eley Timothy V.
Floor to Floor, Inc.
Kahm Steven E.
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