Door interlock security device

Details Door interlock security device Door interlock security device

1975-08-04

1977-03-15

Downey, Kenneth

Movable or removable closures

Sequential closures for passageway

292218, E06B 700

Patent

active

040116867

ABSTRACT:
A transfer-chamber two-door interlock security device includes a rocker arm which can be rocked between first and second door locking positions. If the rocker arm is in a first-door locking position and the second door is opened, a latch flange on the rocker arm engages an edge of the open door to thereby prevent the rocker arm from rocking.

REFERENCES:
patent: 356269 (1887-01-01), Branch
patent: 1603404 (1926-10-01), Proctor
patent: 1632683 (1927-06-01), Tracy
patent: 3174193 (1965-03-01), Smith

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