Locks – Operating mechanism – Key
Patent
1980-11-05
1984-01-10
Wolfe, Robert L.
Locks
Operating mechanism
Key
E05B 2702
Patent
active
044246935
ABSTRACT:
A key-removable core for a lock chamber of figure-8 cross section has a short cylindrical key plug housing fitting the lower lobe of the chamber and a pin tumbler housing containing a series of pin tumbler barrels, two of which are in an extension beyond the key plug housing. A key plug is contained in such housing and a control sleeve aligned with such housing beneath the extension and having pin tumbler bores aligned with said two barrels. Side faces on the pin tumbler housing and spaced from the chamber side wall provide clearance on one side for a retaining lug on the control sleeve retractable into such clearance from core-retaining engagement behind a shoulder in the chamber, and clearance on the other side for a stop lug. An operating key aligns tumblers in all barrels for shear movement at an operating shear line at the outer surface of the key plug. A control key aligns tumblers in the two extension-contained barrels for shear movement at a control shear line at the outer surface of the control sleeve, and tumblers in the other barrels for shear movement at the operating shear line, to permit rotation of the sleeve to retract its retaining lug. The pin tumbler housing may have flat sides which define the lug clearances or may be cylindrical and have clearance recesses cut in it with end faces which ride against the lugs. The core may have a separate face plate, or the pin tumbler housing may itself form the front face of the core.
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patent: 3667264 (1972-06-01), Surko
patent: 4123926 (1978-11-01), Elder
patent: 4328690 (1982-05-01), Oliver
Medeco Removable Core--drawing from applicant's copending application No. 239,436.
Best Walter E.
Foshee William R.
Best Lock Corporation
Wolfe Robert L.
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