Static structures (e.g. – buildings) – Stepped; e.g. – stair – Risers connected to common stringer
Patent
1984-03-05
1986-12-09
Friedman, Carl D.
Static structures (e.g., buildings)
Stepped; e.g., stair
Risers connected to common stringer
182228, E04F 1100
Patent
active
046272003
ABSTRACT:
A stair having a central stringer and two side stringers adapted for mounting between an upper level and a lower level at a relatively steep angle of inclination. A plurality of tread members are disposed in alternating arrangement on respective sides of the central stringer and each tread member extends laterally from the central stringer to the respective side stringer. The tread members, which are substantially identical in shape, mateably join the central stringer and respective side stringers at tread member ends with a dovetail joint having a recessed mortise defining tread supporting shoulders. Handrails are provided at an angle substantially parallel to the stringers and of a height to support a user while descending the stair. Typically an upper tread member is provided which is even with the upper level. The stair is of a structure which permits disassembled shipment as a relatively compact, lightweight package and ease of assembly at a location of intended use.
REFERENCES:
patent: 11718 (1899-06-01), Wilkinson
patent: 71049 (1867-11-01), Page
patent: 395467 (1889-01-01), Welsh et al.
patent: 3727721 (1972-03-01), Kulesa
patent: 4061202 (1977-12-01), Campbell
patent: 4199040 (1980-04-01), Lapeyre
patent: 4367613 (1983-01-01), Strub
patent: 4509617 (1985-04-01), Lapeyre
Cleo Learning Aids, "Foot Placement Ladder" Prior to 2/28/76.
Friedman Carl D.
The Laitram Corporation
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