Key retaining cylinder for a lock

Details Key retaining cylinder for a lock Key retaining cylinder for a lock

1979-07-30

1981-11-17

Frazier, Roy D.

Locks

Operating mechanism

Key

70134, 70364A, 70372, 70379R, 70DIG42, E05B 1100, E05B 2700, E05B 6506

Patent

active

043003745

ABSTRACT:
A key retaining cylinder for a lock operative on standard keys is disclosed. The cylinder of the lock includes an idler ring driven in rotation, with lost motion, by the lock plug. The idler ring is cooperatively disposed with respect to one of the pins so as to restrict the motion thereof when that lock has been used to lock the lock set and to not restrict the movement thereof when that lock has been used to unlock the lock set. Restricted movement of the pin together with the contrapment of the pin within the combinational notch of the key prevents removal of the key. Further features and embodiments are disclosed including provisions for symmetrical operation thereof for left-handed and right-handed doors.

REFERENCES:
patent: 2194244 (1940-03-01), Machinist
patent: 2469018 (1949-05-01), Swanson
patent: 3320781 (1967-05-01), Hill
patent: 3702550 (1972-11-01), Shimizu
patent: 4028917 (1977-06-01), Schlage
patent: 4068510 (1978-01-01), Neary

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