Pickproof cylinder lock

Details Pickproof cylinder lock Pickproof cylinder lock

1974-08-30

1976-07-13

Wolfe, Robert L.

Locks

Operating mechanism

Key

70379R, 70386, E05B 1704

Patent

active

039686680

ABSTRACT:
A pickproof cylinder lock has a plurality of key-actuatable spring-tensioned pin tumblers wholly received in the cylinder and slidably mounted therein, and a ball connected with each pin to be raised or lowered with the pin. The balls are normally held in inactive positions by their pins, but when a proper key is inserted, the balls are brought into active positions by their pins and form a straight link through which key actuation of the pins is translated into a force on a lock-operating member to move the same to a lock-open position. A spring member normally locks the lock-operating member rigidly in a lock-closed position, and the force produced by the balls in their active position is also directed against the spring member to move the latter to a position in which it releases the lock-operating member. The lock also includes a slidable pin engaging the lock-operating member, which pin coacts with a cam surface on the inserted key, and is pressed by said cam surface against the lock-operating member when the key is withdrawn, to insure that the lock-operating member returns to its lock-closed position.

REFERENCES:
patent: 570032 (1896-10-01), Luebbers
patent: 1388778 (1921-08-01), Smith
patent: 3410123 (1968-11-01), Jecobi
patent: 3599455 (1971-08-01), Pilvet

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