Patent ID: RE39364

Claim:
A cylinder lock comprising: an elongated lock shell having opposed axial front and rear ends and a hollow plug-receiving chamber extending therebetween, said rear end including a notch formed therein; an elongated cylinder plug rotatably received within said plug-receiving chamber, said plug including opposed axial front and rear ends and a hollow keyway extending therebetween for receiving a key blade, and a hollow slot radially spaced from and extending parallel to said keyway, said slot having an opening adjacent said plug rear end, said opening being in alignment with said lock shell notch when said cylinder plug has not been rotated within said plug-receiving chamber, said slot further having a side opening in communication with said keyway; and an elongated locking bar reciprocally mounted in said hollow slot, said locking bar including a first end extending from said slot opening and normally received within said lock shell notch for preventing rotation of said cylinder plug within said plug-receiving chamber, and a second end axially opposed from said first end and including a protruding portion protruding into a portion of said keyway, wherein the insertion of a key having a protruding surface on one side thereof in said keyway enrages engages said protruding portion of said locking bar and shifts said locking bar towards said cylinder plug rear end so that said first end of said locking bar is shifted out of said notch for permitting rotation of said cylinder plug within said plug-receiving chamber.