Door latch mechanism

Details Door latch mechanism Door latch mechanism

1983-06-29

1986-09-23

Smith, Gary L.

Closure fasteners

Bolts

Swinging

70 92, 29234119, 292DIG49, 292DIG55, 292DIG60, 292DIG65, E05C 300

Patent

active

046131760

ABSTRACT:
A door latch mechanism has a pivoted latch disposed between a retaining solenoid and a four-bar toggle linkage. The toggle linkage connects the operating stem of the solenoid to the latch, has an under-the-center arrangement in a direction away from the solenoid in the latched position of the mechanism, and provides a substantial mechanical advantage to amplify the holding force of the solenoid. When the solenoid is de-energized and pressure is applied to open the door, the latch pivots and the toggle linkage collapses to release the keeper bar. The keeper bar is trapped but has a limited movement in both horizontal and vertical directions in a plane substantially parallel to the pivot axis of the latch. The overall arrangement is relatively simple, compact, inexpensive, easy to install, and reliable in its operation.

REFERENCES:
patent: 1062084 (1913-05-01), Desbecker
patent: 1493105 (1924-05-01), Carroll
patent: 2231414 (1941-02-01), Model
patent: 2622431 (1952-12-01), Cerf, Jr.
patent: 2713506 (1955-07-01), Wickstrom
patent: 2851296 (1958-09-01), Guyaz
patent: 3751088 (1973-08-01), Schlage et al.
patent: 3805693 (1974-04-01), Neitzel et al.
patent: 3971239 (1976-07-01), Lavis
patent: 4142751 (1979-03-01), Varda
patent: 4470625 (1984-09-01), Walsh et al.
patent: 4540208 (1985-09-01), Logan, Jr. et al.

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