Breakaway cylinder head

摘要

A mechanical lock is provided which prevents forced rotation of the cylinder when a mated key is not present in the key slot. The lock includes a cylinder rotatably supported within a sleeve. The cylinder defines a longitudinal axis and a keyway disposed along the axis for slidably receiving a key therein. A cylinder head extends circumferentially about a first end of the cylinder and includes a frangible ring portion which fractures in response to a predetermined rotational force. A tab extends from the cylinder head and includes a frangible base which also fragments in response to a predetermined rotational force. The mechanical lock further includes a sidebar for preventing rotation of the cylinder when a mated key is not present therein. The sidebar includes a rib extending therefrom which prevents the longitudinal sliding of the sidebar out of the mechanical lock when the cylinder head has been broken away from the cylinder.