Stair tread

Details Stair tread Stair tread

1999-01-19

2000-07-04

Kent, Christopher T.

Static structures (e.g., buildings)

Stepped; e.g., stair

Tread unit on horizontal tread member connected to riser

52182, 52630, 523091, 5274519, E04F 1100

Patent

active

060820616

ABSTRACT:
A stair tread and method of manufacturing same is disclosed. The stair tread comprises a rigid frame which is encapsulated with a structural plastic material. In the preferred embodiment, the rigid frame is made from steel and the encapsulating structural plastic is a polyol and isocyanate blend which is applied to the rigid frame by the reaction injection molding process. The stair tread exhibits the advantages of a bar grating stair tread and the corrosions resistance of a plastic stair tread while being low cost and efficient to manufacture.

REFERENCES:
patent: 2994417 (1961-08-01), Nagin
patent: 3021928 (1962-02-01), Blair
patent: 3834098 (1974-09-01), Wutzke
patent: 3897665 (1975-08-01), Yokomori
patent: 3932972 (1976-01-01), Rossman
patent: 3978628 (1976-09-01), Turner
patent: 4873802 (1989-10-01), Dahowski
patent: 5357724 (1994-10-01), Sonoda

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