Electrically operated multiple security bolt door locking device

Details Electrically operated multiple security bolt door locking device Electrically operated multiple security bolt door locking device

1978-07-13

1980-07-15

Foss, J. Franklin

Closure fasteners

Bolts

Multiple

292144, 292333, E05C 106

Patent

active

042124891

ABSTRACT:
An electrically operated multiple security bolt door locking device which serves to enhance the inherent strength of a door being so controlled and thereby providing maximum resistence to forceful entry. To this end a plurality of reinforced security bolts are provided in sufficient number thereof and disposed, preferrably externally, on wall immediately adjacent to said door and decoratively covered. Said bolt plurality is normally biased locked and electrically withdrawn, in concert, from locked position and retained in unlocked position while door is open. Said security bolt plurality is employed horizontally along a line juxtaposed with said wall and door.

REFERENCES:
patent: 228323 (1880-06-01), Crandal
patent: 436405 (1890-09-01), Domer
patent: 1054112 (1913-02-01), Handschuh
patent: 1422589 (1922-07-01), McQuiston
patent: 2070803 (1937-02-01), Oblak
patent: 2772905 (1956-12-01), Ousing
patent: 2879725 (1959-03-01), Zuver
patent: 3094199 (1963-06-01), Wallmann
patent: 3134254 (1964-05-01), Richard
patent: 3295878 (1967-01-01), Houvener
patent: 4030322 (1977-06-01), Pettit

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