Means for, and a method of, securing a closure

Details Means for, and a method of, securing a closure Means for, and a method of, securing a closure

1981-05-13

1983-08-30

Moore, Richard E.

Closure fasteners

Rigid engaging means

292DIG44, 292DIG66, E05C 1500

Patent

active

044013302

ABSTRACT:
In the preferred embodiment depicted, the invention comprises a limb, having a depending lug, fixed to a door. The lug makes a close clearance, near engagement with a socket-retainer fixed to a door-interfacing mullion. The upper end of the mullion is foreshortened, and addressed to a free space; it is slidably engaged with an internal socket. Accordingly, in the event of fire, the mullion may freely extend vertically, due to the heat. Such free extension causes the socket-retainer, and the depending lug, mutually to engage. By this arrangement, the door is secured closed, on the exposure to severe heat, even if the normal latching and/or locking device therefor comes loose or disengaged. The method comprehends fixing the mullion at one end, securing it against angular movement, exposing the other end to a free space, and mounting to the closure and mullion locking components which come into engagement only in response to thermal extension of the mullion.

REFERENCES:
patent: 251432 (1881-12-01), Goff
patent: 310223 (1885-01-01), Rappleyea
patent: 778001 (1904-12-01), Bell
patent: 3606423 (1971-09-01), McCarthy

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