Locks – Operating mechanism – Key
Patent
1978-11-22
1980-11-18
Wolfe, Robert L.
Locks
Operating mechanism
Key
70383, E05B 2700
Patent
active
042338280
ABSTRACT:
A changeable combination, axial pin tumbler lock is operable by means of a cylindrical service key. Set keys are used to change the tumbler combination and thereby provide for operation of the lock by a different service key. The lock includes a fixed cylindrical barrel with twelve tumbler passages in opposed relation with a rotatable plug and barrel having seven tumbler passages. One half of the passages of the fixed barrel store reserve tumblers. A single shear interface is defined by the plug barrel and fixed barrel. Transfer of reserve tumblers from the fixed barrel passages to the plug barrel passages by means of set keys effects a combination change.
REFERENCES:
patent: 3422646 (1969-01-01), Monahan
patent: 3648492 (1972-03-01), Walters
Keystone Consolidated Industries, Inc.
Wolfe Robert L.
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