Security lock with two locking mechanisms, of the pump type and

Details Security lock with two locking mechanisms, of the pump type and Security lock with two locking mechanisms, of the pump type and

1992-10-22

1994-08-23

Cuomo, Peter M.

Locks

Special application

For closures

70409, 70150, 70338, 70DIG63, 70395, 292150, E05B 6314

Patent

active

053396596

ABSTRACT:
A security lock for doors of dwellings, gates and the like comprises a pump-type locking mechanism for operating a bolt, and a double-bit locking mechanism for locking the pump mechanism in its locking condition. The lock preferably has both a key which can operate only the pump mechanism and a key which can operate both mechanisms. A cover made of plastics material is associated with the key and can be fitted onto the operative portion of the key in order to protect its teeth against dirt and against the risk of breakage as a result of the key being dropped.

REFERENCES:
patent: 238113 (1881-02-01), Hand
patent: 890172 (1908-06-01), Papenfoth
patent: 970252 (1910-09-01), Mason
patent: 1150617 (1915-08-01), Page
patent: 1383631 (1921-07-01), Hoffman
patent: 1953292 (1934-04-01), Dube
patent: 2449711 (1948-09-01), Milligan
patent: 3841120 (1974-10-01), Gartner
patent: 4305267 (1981-12-01), Nish et al.
patent: 4641507 (1987-02-01), Demonbreun

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