Exterior safety lock apparatus

Details Exterior safety lock apparatus Exterior safety lock apparatus

1978-06-19

1980-11-18

Lyddane, William E.

Closure fasteners

Bolts

Sliding

70 39, 70128, 70134, E05C 104, E05C 1302, E05B 6506

Patent

active

042342201

ABSTRACT:
Tamper-free exterior lock apparatus to affix to a door for maintaining latched engagement to the door's frame. Two sets of shackles, one pair fixed to a backing plate and the other insertable with respect to a lock housing, engage, respectively, a primary lock and a secondary lock so that no portion of the shackle is exposed when coupled with its lock. Primary lock guards protrude from the lock housing to restrict access to the primary lock. A slide bar having a latching portion at one end and a lip portion oriented perpendicular to the main portion of the slide bar at the other end is maintained in slidable relationship to the backing plate and housing to allow the movement of the lock apparatus from its latching position to its open position and to block the slide bar from movement when either or both of said locks is engaged to its set of shackles.

REFERENCES:
patent: 1866955 (1932-07-01), Terrill
patent: 2656704 (1953-10-01), Mancuso
patent: 2758861 (1956-08-01), Molloy
patent: 3945228 (1976-03-01), Voegeli
patent: 3946581 (1976-03-01), Weeks et al.
patent: 3953062 (1976-04-01), Maston
patent: 4095828 (1978-06-01), East

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