Door opener

Details Door opener Door opener

1998-03-18

1999-07-20

Boucher, Darnell M.

Closure fasteners

Bolts

Swinging

29234116, 2922515, E05C 306

Patent

active

059247509

ABSTRACT:
A door opener wich can be used for closed-circuit current operation as well s for working current operation, includes a door latch and a trimmer which can be moved for blocking and releasing the door latch, an armature which can be displaced for blocking or releasing the trimmer, an electromagnet for displacing the armature, whereby the armature can be moved between three consecutive armature positions, namely a first armature position, a second armature position, and a third armature position. The armature positions alternately provide a locking and releasing of the door latch. The door opener also includes a stop element, which can be displaced for delimiting the displacement path of the armature between a first stop position and a second stop position such that the first or third armature position is blocked.

REFERENCES:
patent: 320617 (1885-06-01), Blattman
patent: 3819215 (1974-06-01), Fuss
patent: 4015869 (1977-04-01), Horvath
patent: 4211443 (1980-07-01), Butts et al.
patent: 4756566 (1988-07-01), Logas
patent: 4815776 (1989-03-01), Fuss
patent: 4986584 (1991-01-01), Logas
patent: 5439262 (1995-08-01), Fuss et al.
patent: 5490699 (1996-02-01), Uyeda
patent: 5681070 (1997-10-01), Williams et al.
patent: 5788295 (1998-08-01), Fuss et al.

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