Locks – Operating mechanism – Key
Patent
1987-07-01
1989-06-06
Wolfe, Robert L.
Locks
Operating mechanism
Key
70384, 70385, 70368, 70340, E05B 2500
Patent
active
048360023
ABSTRACT:
A lock apparatus includes a lock provided with a cylindrical plug having a set of blind holes angularly spaced from the set of pinways in the plug. A longitudinal slot through the center of the blind holes accepts a programming member that lifts one or more master pins out of the blind holes and into housing pinways when the lock is unlocked with a master key and the plug is rotated into a rekeying position to align the blind holes with the housing pinways. The programming member has a hole or notch near its front end to facilitate removal when the lock is unlocked and the plug is in the rekeying position. The programming member may be in the form of a set blade or a set rod, and may be reversible end-to-end to provide additional rekeying combinations. A method includes programming the lock to operate with only one exclusively differently-bitted change key or sub-master key at a time by requiring a shallower bitting depth at a tumbler station from which a master pin has been removed and permitting and having a deeper bitting depth at a tumbler station to which a master pin has been inserted and thus rendered active.
REFERENCES:
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patent: 3910083 (1975-10-01), Burlingame
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patent: 4712401 (1987-12-01), Monahan
patent: 4747281 (1988-05-01), Monahan
Dino Suzanne L.
Martine, Jr. Chester E.
Wolfe Robert L.
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