Safety lock device

Details Safety lock device Safety lock device

1984-10-12

1987-02-17

Smith, Gary L.

Safes, bank protection, or a related device

Bank protection devices

Trapping mechanisms

70267, 292144, 109 59T, E05G 300, E05B 4700

Patent

active

046431063

ABSTRACT:
A manually actuable lock is disposed on the inside of an outside door leading to a vestibule. The lock, when manually actuated from inside the vestibule only, throws a dead bolt for a pre-determined period of time so as to secure the user in the vestibule from parties outside the vestibule. During the predetermined period, the user then gains access to the building through a key actuated lock on the inner door of the vestibule. A piston and cylinder retarding element provides for the timed retraction of the dead bolt.

REFERENCES:
patent: 215777 (1879-05-01), Shaw
patent: 1178697 (1916-04-01), Yurow
patent: 1965005 (1934-07-01), Schlachter
patent: 2079824 (1937-05-01), Smeaton et al.
patent: 2146134 (1939-02-01), Zuber
patent: 3100389 (1963-08-01), Noregaard

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