Linear thumb-piece actuation latch mechanism

Details Linear thumb-piece actuation latch mechanism Linear thumb-piece actuation latch mechanism

2007-10-30

2007-10-30

Gay, Jennifer H. (Department: 3676)

Closure fasteners

Operators with knobs or handles

C292S137000, C070S107000, C070S471000

Reexamination Certificate

active

11657879

ABSTRACT:
This invention provides a thumb-piece door latch mechanism which has ergonomic features, is modular and can be used with any escutcheon, can be used with all type locks, and which in the locked door mode provides greater resistance to abusive attack of the door latch mechanism and makes the thumb-piece and latch mechanism more durable and less susceptible to vandalism. The thumb-piece moves linearly up and down and is connected to a thumb-piece guide plate which likewise moves up and down when the thumb-piece is moved. A permissive spring having one end connected to a spindle turn plate and the other end connected to the guide plate moves a rotatably mounted spindle, which in turn rotates a spindle tail and a latch connected to the spindle tail. The permissive spring provides greater resistance to abusive attacks of the door lock and mechanism.

REFERENCES:
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patent: 4123097 (1978-10-01), Allemann
patent: 4502720 (1985-03-01), Fayerman et al.
patent: 4779909 (1988-10-01), Hennessy
patent: 4925222 (1990-05-01), Loock
patent: 4982986 (1991-01-01), Gressett, Jr. et al.
patent: 4988136 (1991-01-01), Gressett, Jr.
patent: 5060991 (1991-10-01), Davidian et al.

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