Cylinder lock

Details Cylinder lock Cylinder lock

1981-09-25

1984-06-19

Smith, Gary L.

Locks

Operating mechanism

Key

E05B 1516, E05B 6300

Patent

active

044547366

ABSTRACT:
A cylinder lock is provided with means for preventing a cylinder from being extracted to improve safety against breakage of the lock. The preventing means comprises a deformable portion formed at an entrance of a keyhole of the cylinder and deformable into a radially expanded form when a force is applied to forcibly insert some object other than a correct key into the keyhole, and a stop portion formed in a casing of the cylinder lock for preventing the deformable portion in the deformed form from being extracted.

REFERENCES:
patent: 1705344 (1929-03-01), Thompson
patent: 1705364 (1929-03-01), Heyer
patent: 3142168 (1964-07-01), Wellekens
patent: 4231244 (1980-11-01), Krugener et al.

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