Abstract: A lock cylinder includes a housing and first and second key plugs rotatably received in the housing about an axis. The first and second key plugs are axially spaced in the housing and each includes a keyway for insertion of a corresponding key. The keyways of the first and second key plugs are aligned with each other along the axis. The lock cylinder further includes a blocking core fixedly mounted in the housing and between the first and second key plugs along the axis. The blocking core includes a through-hole aligned with the keyways of the first and second key plugs along the axis. The lock cylinder can effectively prevent an illegal picking tool from inserting into the keyways of the first and second key plugs and from turning the key plugs, thereby providing an enhanced anti-theft effect.

Abstract: A lock cylinder includes a housing including an axial bore extending from a front end thereof through a rear end thereof along an axis. The axial bore includes a first larger section in the front end, a second larger section in the rear end, and a smaller section intermediate the first and second larger sections. An annular protrusion is integrally formed on an inner wall of the axial bore intermediate the first and second larger sections, and the smaller section is defined in the annular protrusion. The lock cylinder further includes first and second key plugs rotatably and respectively received in the first and second larger sections about the axis. Each of the first and second key plugs includes a keyway for insertion of a corresponding key. The keyways of the first and second key plugs and the smaller section of the axial bore are aligned with each other.

Abstract: A lock cylinder includes a housing and first and second key plugs rotatably received in the housing about an axis. The first and second key plugs are axially spaced in the housing and each includes a keyway for insertion of a corresponding key. The keyways of the first and second key plugs are aligned with each other along the axis. The lock cylinder further includes a blocking core fixedly mounted in the housing and between the first and second key plugs along the axis. The blocking core includes a through-hole aligned with the keyways of the first and second key plugs along the axis. The lock cylinder can effectively prevent an illegal picking tool from inserting into the keyways of the first and second key plugs and from turning the key plugs, thereby providing an enhanced anti-theft effect.