Locking device for a door

Details Locking device for a door Locking device for a door

2005-02-22

2005-02-22

Estremsky, Gary (Department: 3676)

Closure fasteners

Magnetic

C292S341160

Reexamination Certificate

active

06857671

ABSTRACT:
The invention provides for an electromagnetic lock (10) for a door. The lock (10) includes a backing plate (12) which is connectable to a door frame, an electromagnet (14), a housing (30) for the electromagnet, and an armature plate (16) connectable to a door (32) which is displaceable relative to the housing (30) between a closed condition in which it engages the housing and an open condition in which it is spaced from the housing. The lock (10) also includes two locking arms (18) which are movable between an operative position in which they engage the armature plate (16) and the backing plate (12) to capture the armature plate in the closed condition and an inoperative position in which they allow the armature plate to disengage the housing (30).

REFERENCES:
patent: 2435729 (1948-02-01), Whann et al.
patent: 3201960 (1965-08-01), Berkowitz
patent: 3736779 (1973-06-01), Pratt
patent: 5184855 (1993-02-01), Waltz et al.
patent: 5641187 (1997-06-01), Frolov
patent: 6092846 (2000-07-01), Fuss et al.
patent: 6260892 (2001-07-01), Chang
patent: 20040026933 (2004-02-01), Smith
patent: 2 722 232 (1996-01-01), None
patent: 2 123 472 (1984-02-01), None

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