Double door assembly

Details Double door assembly Double door assembly

1981-06-01

1983-06-28

Kannan, Philip C.

Movable or removable closures

Mounted for optional movements

One closure movable separately from or with other closure

49 62, 49 67, 49395, E05D 1548, E05B 6504

Patent

active

043898173

ABSTRACT:
A novel way of keeping thieves out of dwellings and other spaces utilizes two interlocked, relatively nested doors which, when so interrelated, are in turn, separately locked as a unit within the door frame. Release from the exterior requires knowledge of a secret system of a push-button control which must be operated in proper sequence. Special, tamper-proof hinges, common to the doors, permit them to be hung in the door frame for separate swinging or movement as a unit. The interlock between the doors is releasable only from the inside and, upon such release, the outer door remains locked until separately released by the occupant.

REFERENCES:
patent: 2798751 (1957-07-01), Walden
patent: 2801688 (1957-08-01), Singleton
patent: 3192448 (1965-06-01), Hevenor
patent: 3513357 (1970-05-01), Dittmore
patent: 4099752 (1978-07-01), Geringer
patent: 4302907 (1981-12-01), Canals et al.

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