Structural step unit with run portion and rise portion

Details Structural step unit with run portion and rise portion Structural step unit with run portion and rise portion

2004-12-28

2010-12-14

Safavi, Michael (Department: 3637)

Static structures (e.g., buildings)

Stepped; e.g., stair

Tread unit on horizontal tread member connected to riser

Reexamination Certificate

active

07849643

ABSTRACT:
A riser is formed by a structural sandwich plate member in the run or tread portion but a simple steel plate in the rise portion. This riser is cheaper and simpler to manufacture than risers in which both the run and tread are formed by structural sandwich plate members.

REFERENCES:
patent: 4899504 (1990-02-01), Hirschhorn
patent: 5014475 (1991-05-01), Anderson, Jr. et al.
patent: 5778813 (1998-07-01), Kennedy
patent: 6050208 (2000-04-01), Kennedy
patent: 6895717 (2005-05-01), Grinstead
patent: 2003/0207116 (2003-11-01), Franken et al.
patent: WO-01/32414 (2001-05-01), None
patent: WO-02/33200 (2002-04-01), None

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