Patent ID: 7958759

Claim:
A key-removable lock core comprising: a) a sleeve comprising a lower cylindrical barrel portion having a longitudinally arranged tubular bore, an upper extension having a plurality of spaced-apart radially-arranged operating pin bores, and a retaining lug extending from the sleeve; b) a housing having (i) a lower body portion having a longitudinally-arranged tubular bore for receiving the barrel portion of the sleeve, (ii) an upper body portion having a longitudinally-arranged retaining chamber for receiving the upper extension and retaining lug of the sleeve, and a plurality of radially-arranged control pin bores extending to the tubular bore to define a control shear line, and (iii) a retaining slot to accommodate tangential movement there through of the retaining lug; c) a cylindrical key plug rotatable between a key insertion position and a control position, within the tubular bore of the sleeve, and having a cylindrical periphery, a longitudinally-arranged keyway, a plurality of radially-arranged tumbler bores that extend from the keyway to the periphery, to define an operating shear line, the key plug further having at least one control cavity displaced circumferentially from at least one of the tumbler bores, and a control channel intersecting a portion of the at least one control cavity; d) a plurality of tumbler pins disposed for axial movement within the plurality of tumbler bores; e) a plurality of operating pins disposed for axial movement within the plurality of operating pin bores; f) a plurality of control pins disposed for axial movement within the plurality of control pin bores; g) at least one auxiliary control pin disposed in the at least one control cavity; and h) a control tooling configured for manipulation within the control channel to intersect the at least one control cavity, for biasing the at least one auxiliary control pin out of the at least one control cavity at least partially into an associated tubular bore in the sleeve when the key plug is disposed in the sleeve in the control position.