Double-latch mechanism

Details Double-latch mechanism Double-latch mechanism

1980-08-05

1982-05-18

Moore, Richard E.

Closure fasteners

Bolts

Multiple

E05C 116

Patent

active

043301452

ABSTRACT:
A door-mounted double-latch mechanism consists of two forwardly-sprung latching pawls which are adapted to engage a keeper mounted on the door jamb. One of the latching pawls, the secondary pawl, has a wider keeper-receiving recess at its forward end than does the primary pawl, so that the secondary pawl will snap behind the keeper before the primary pawl does. As a result, even if the door is not fully closed, the secondary latching pawl will nevertheless be engaged. Mounted on the inside of the door is a cam with a bent-up tab which is adapted to engage both pawls. When the cam is rotated in one direction the primary pawl is caused to retract. When the cam is rotated in the opposite direction the secondary pawl is caused to retract. Sandwiched between the two pawls is a spring-biased lever the primary purpose of which is to urge the door outwardly, ie., towards the open position.

REFERENCES:
patent: 281109 (1883-07-01), Milton
patent: 1428367 (1922-09-01), Forlander
patent: 1669227 (1928-05-01), Blouser
patent: 1833994 (1931-12-01), Hines
patent: 3650554 (1972-03-01), Thorp

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