Movable or removable closures – Removable closure – Releasable means on closure
Patent
1991-06-06
1992-06-23
Kannan, Philip C.
Movable or removable closures
Removable closure
Releasable means on closure
49394, 52196, E05C 2102
Patent
active
051232057
ABSTRACT:
A closure assembly selectively closes an access opening for an enclosure having walls defining an interior space. The closure assembly includes a pair of hinges mounted to the one wall on opposite sides of the opening, the hinges having aligned apertures therethrough spaced outwardly from the one wall. A rectangular sheet metal door of a size larger than the opening is formed in a generally pyramid configuration having four creases, each extending from the centerpoint to one of the corners of the door. The centerpoint defines an apex of the pyramid configuration. Each side edge of the door between adjacent corners has a downward convex curve. The door is positioned in overlying relationship with the opening to completely cover the same with the apex disposed intermediate the hinges. A cam rod has a central, overcentered cam between opposite end rods rotatably and removably received in the hinge openings and a handle operatively associated with the cam. Rotation of the cam by the handle causes the cam to apply pressure to the apex of the door and through the creases to the curved side edges to provide an even seal of the door about the opening.
REFERENCES:
patent: 1247186 (1917-11-01), Wampach
patent: 1381894 (1921-06-01), Stafford
patent: 3340650 (1967-09-01), Sackett, Sr.
patent: 3461607 (1969-08-01), Sandow et al.
patent: 3918204 (1975-11-01), Lynch et al.
patent: 4224770 (1980-09-01), Petty
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