초록 ▼

A key-removable core of figure-8 cross section having increased pull resistance. A recess is formed in the pin tumbler lobe of the core body and opens both outward through the side of the body and downward toward the key plug lobe. A control sleeve in the key plug lobe has a wide longitudinal rib wh

A key-removable core of figure-8 cross section having increased pull resistance. A recess is formed in the pin tumbler lobe of the core body and opens both outward through the side of the body and downward toward the key plug lobe. A control sleeve in the key plug lobe has a wide longitudinal rib which carries a core-retaining lug which extends from such rib both circumferentially of the sleeve and radially outward thereof into said recess so as to substantially increase the effective cross section of the lug for increased pull resistance. Cores with thus enlarged lugs may be used in standard receptacles. Also, the plug may be in two segments providing two end faces for retaining engagement with two shoulders in the wall of the receptacle. The lug may be further enlarged by increasing its length, and the increased length accommodated by forming the core chamber with deeper clearances and wider lug-engaging shoulders.

대표청구항 ▼

A key-removable lock core having increased pull resistance, comprising a core body of figure-8 cross section and having a key plug lobe formed with an axial bore therethrough, and a parallel pin tumbler lobe, a key plug rotatable on an axis in the key plug lobe, a control sleeve inserted axially in

A key-removable lock core having increased pull resistance, comprising a core body of figure-8 cross section and having a key plug lobe formed with an axial bore therethrough, and a parallel pin tumbler lobe, a key plug rotatable on an axis in the key plug lobe, a control sleeve inserted axially in said bore and having a cylindrical interface with said key plug defining an operating shear line between the key plug and sleeve, said sleeve including a wide rib extending longitudinally substantially the fully length of the key plug and said pin tumbler lobe having a wide recess in which such rib is movable through a limited angle about the axis of said bore, the outer face of said rib and the inner face of said recess defining a control shear line therebetween, a series of pin tumbler barrels in said pin tumbler lobe and extending into the key plug, substantially all of which barrels extend across both said shear lines and through said wide rib so that the core can be combinated at substantially all of said barrels at the control shear line, said rib-receiving recess having side walls interconnecting the two lobes of the core body over a portion of the length of the body and the one side wall having an opening therethrough over a rear end portion of the core body and the rib having a retaining lug portion movable in said opening between a projected position in which it will engage behind a shoulder of a core receptacle to retain the core therein and a retracted position in which it releases the core for removal from such receptacle, and including the improvement comprising an enlargement recess in the pin tumbler lobe of the core body extending forward from the rear end of the body and adjoining said side wall opening, and an enlargement on said retaining lug extending radially of said sleeve beyond the face thereof which defines said control shear line, said lug enlargement serving to increase the cross-sectional area of said retaining lug and being movable with such lug between a retracted position within said enlargement recess in the pin tumbler lobe and a projected position in which it provides an enlarged cross section on the retaining lug for engagement behind a shoulder of the core receptacle.