Key retaining cylinder for a lock
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United States of America Patent
Stats
-
Nov 17, 1981
Grant Date -
N/A
app pub date -
Jul 30, 1979
filing date -
Jul 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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