Key-changeable lock core

Details Key-changeable lock core Key-changeable lock core

1981-03-02

1983-06-07

Wolfe, Robert L.

Locks

Operating mechanism

Key

70373, E05B 2704

Patent

active

043865100

ABSTRACT:
A key-changeable lock core of FIG. 8 cross section has a core body with key plug and pin tumbler housings, and a key plug supported for rotation in the key plug housing. A control element, desirably a sleeve about the key plug having a thick top segment carrying a core-retaining lug, is mounted in a core-body recess for rotation between a core-locking position and a lug-retracted position. Its inner face defines an operating shear line at the surface of the key plug, and its outer face defines a control shear line at the top face of the recess, which is preferably a flat planar face. The outer face of the control element has an arcuate portion in the vicinity of the pin tumbler barrels on a radius of curvature about the axis of the control element, and has a planar face portion extending toward the retaining lug in diverging relation with such curvature, preferably tangentially therefrom. Such planar face moves against a lateral portion of the top face of the recess as a stop to stop the control element in its lug-retracted position, and the outward divergence of the planar face provides that the lug and its supporting structure extend radially beyond the radius of curvature of the arcuate outer face portion of the control element to increase their cross section and core-retaining strength. Preferably, a second planar face on the control element moves against the top face of the recess to provide stop means for such element in its core-locking position.

REFERENCES:
patent: 1561771 (1925-11-01), Best
patent: 2814941 (1957-12-01), Best
patent: 3206958 (1965-09-01), Best
patent: 3667264 (1972-06-01), Surko et al.
patent: 4123926 (1978-11-01), Elder
Drawing of Medeco Removable Core.

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