Warp resistant fire door

Details Warp resistant fire door Warp resistant fire door

1974-07-22

1976-09-21

Kannan, Philip C.

Movable or removable closures

Panel with closure feature

49409, 52232, 52619, E06B 316, E06B 516

Patent

active

039811026

ABSTRACT:
A warp resistant fire door structure is disclosed, which includes a frame and a pair of front and back panels mounted thereon. The panels are secured permanently to the frame only at points adjacent their lateral edges. At other points, the panels are heat releasably bonded to the frame to be able to expand and contract relative to the frame in the presence of ambient temperature extremes.

REFERENCES:
patent: 1139842 (1915-05-01), Brogden et al.
patent: 1152011 (1915-08-01), Doren
patent: 1604099 (1926-10-01), Johnson
patent: 1610282 (1926-12-01), Hansen
patent: 1680538 (1928-08-01), Gross
patent: 3001614 (1961-09-01), Shane
patent: 3105272 (1963-10-01), Tucker, Jr.
patent: 3325941 (1967-06-01), Prucha
patent: 3566564 (1971-03-01), Gaeth et al.

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