Static structures (e.g. – buildings) – Stepped; e.g. – stair
Patent
1993-06-17
1994-10-25
Friedman, Carl D.
Static structures (e.g., buildings)
Stepped; e.g., stair
52188, 52191, 52177, E04F 1100
Patent
active
053577248
ABSTRACT:
A stair tread, in which synthetic rubber is used to encase metal side core portions arranged at the side edges of a substantially horizontal core section at a downward right-angle thereto. A lip is provided along the side edges of the tread surface. The lip projects upward, the outside surface of the lip is flush with the surface of the synthetic rubber that covers the side core sections, and the lip is formed in one piece, of synthetic rubber.
REFERENCES:
patent: 893198 (1908-08-01), Schachner
patent: 1457515 (1923-06-01), Frisch
patent: 4451063 (1984-05-01), Snyder
Friedman Carl D.
Sonoda Factory Co., Ltd.
Wood Wynn E.
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