Patent ID: 9051759
Filing Date: 2015-06-09
Classification: E05B,Y10T

Abstract:
1. A key-removable lock core comprising: a) a sleeve comprising a lower cylindrical barrel portion having a longitudinally formed tubular bore, an upper extension having a plurality of spaced-apart radially-arranged operating pin bores, and a securing lug extending from the sleeve; b) a housing having (i) a lower body portion having a longitudinally-formed 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 securing 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 securing slot to accommodate tangential movement therethrough of the securing 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-formed 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 an axially arranged groove formed into the periphery of the plug and displaced circumferentially from the plurality of tumbler bores, the groove having, in cross-section, a radially-outermost carriage groove, a radially intermediate curved trough extending radially inwardly from the center of the carriage groove, and a control tooling slot formed radially inwardly from the curved trough; 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) a carriage disposed and moveable axially within the carriage groove between a first and second position, having an outer surface proximate with the cylindrical periphery of the key plug, and having a plurality of radially-formed retainer bores that register with the operating pin bores of the sleeve with the carriage in the second axial position and the key plug is disposed in the control position; h) at least one change ball disposed in at least one of the retainer bores of the carriage and within the curved trough; and j) a tooling configured for manipulation within the control tooling slot to intersect at least a portion of the curved trough, for biasing the at least one change ball at least partially out of the curved trough and at least partially into an associated operating pin bore in the sleeve when the key plug is disposed in the sleeve in the control position.