Locks – Operating mechanism – Key
Patent
1976-12-20
1978-06-13
Wolfe, Robert L.
Locks
Operating mechanism
Key
70383, E05B 2500
Patent
active
040941752
ABSTRACT:
A pin tumbler cylinder lock having a plug rotatable within an external housing, the housing and plug having a row of axially aligned locking bores, a key slot in said plug in alignment with the bores, the lock bores having space for springs, wafers and locking tumbler pins positioned and sized to permit the plug to be operated with a predetermined operating key to lock and unlock the lock when the operating key is inserted into the slot; the housing having a row of auxiliary aligned bores angularly offset from the locking bores, the auxiliary bores having springs and master wafers, the springs biasing the master wafers inwardly toward the plug; and the improvement comprising a relatively thin-walled shutter sleeve fitted for rotation around the plug, the plug being adapted to rotate within the shutter and/or therewith, a row of axially aligned locking bores in said shutter in respective radial and axial alignment with the locking bores in the housing and the plug; first means within the housing and the shutter to prevent rotation of the shutter when the operating key rotates the plug and locks and unlocks the lock; second means within the housing, the shutter, and the plug to permit a lock-changing predetermined key to rotate the plug and the shutter in the housing to respectively align said locking bores in the plug and shutter with the auxiliary bores in the housing; and third means within the housing and the shutter to hold the locking bores in the shutter in alignment with the auxiliary bores when a changing predetermined key is removed from the slot. The wafers in the auxiliary bores may be added to or removed from the locking bores in the plug when the plug bores are in alignment with the auxiliary bores, the wafer changes being in accordance with the shape of a predetermined changing key; and the wafers and/or tumbler pins in each case being adapted to form a break line adjacent the cylinder wall of the shutter to permit its rotation by rotation of the changing key.
REFERENCES:
patent: 2113007 (1938-04-01), Swanson
patent: 3210973 (1965-10-01), Basseches
patent: 3599456 (1971-08-01), Bessim
Sternfels Lewis B.
Wolfe Robert L.
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