Check-actuated control mechanisms – Check prevents locking of part by detent
194344, G07F 1712
A coin holding mechanism is adapted for use in new coin operated lock units and in retrofitting previously installed lock units of the type adapted for "free" service in order to prevent return of a coin deposit to a patron until the lock unit is in a condition wherein a key operated patron lock cannot be placed/returned to locked position in which the key of the patron lock can be removed in the absence of another coin being properly placed on deposit within the lock unit.
patent: 1933263 (1933-10-01), Hofmann
patent: 2580590 (1952-01-01), Polsen et al.
patent: 2684144 (1954-07-01), Beimel
patent: 3037605 (1962-06-01), Stackhouse
patent: 3193074 (1965-07-01), Stackhouse
patent: 3228506 (1966-01-01), Stackhouse
patent: 3269507 (1966-08-01), Smith et al.
patent: 3599770 (1971-08-01), Stackhouse et al.
American Locker Group Incorporated
Ammeen Edward S.
Rolla Joseph J.
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