A lock for incapacitating a motorcycle disk brake having ventilation holes, said lock comprising:
- (a) a lock body having a first lateral side, a second lateral side adjacent to said first lateral side, and a slot substantially perpendicular to said first lateral side and extending into said lock body for a predetermined length;
- (b) a locking bolt disposed inside said lock body in such manners that it reciprocates between a first position and a second position, and that it is situated at said first position at such time when there is no external force exerting thereon, and further that it is actuated to move from said first position to said second position to seal off an open end of said slot at such time when there is an external force acting on said locking bolt, said locking bolt having a diameter which allows said locking bolt to be passed snugly through one of said ventilation holes in said disk brake, said predetermined length being long enough to receive said disk brake in said slot while allowing said bolt to pass through one of said ventilation holes;
- (c) a braking bolt disposed inside said lock body in such manners that it reciprocates between a third position and a fourth position, and that it is situated at said third position so as to confine said locking bolt at said second position at such time when there is no external force exerting on said braking bolt, and further that said braking bolt moves from said third position to said fourth position to release said locking bolt so as to move back to said first position at such time when there is an external force acting on said braking bolt;
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- (d) a locking and unlocking device disposed in said lock body and provided with a rotatable core, which confines said braking bolt to said fourth position at such time when said rotatable core is situated at an unlocking position of said device, and which releases said braking bolt to move to said third position at such time when said rotatable core is situated at a locking position of said device;
- wherein said lock body is of substantially flat rectangular construction, and wherein said slot extends into said lock body from said first lateral side of said lock body in such a manner that it is parallel to said second lateral side of said lock body so as to divide said lock body into a first portion and a second portion, with said first portion being wider than said second portion;
- wherein said lock body has a horizontal through hole, which traverses said lock body in such manners that it is parallel to said first lateral side and that it traverses said slot having an open end situated in said first lateral side, said horizontal through hole being divided into a front segment situated in said first portion, a mid-segment situated in said first portion and having an outer diameter smaller than that of said front segment, and a rear segment situated in said second portion;
- wherein said locking bolt has a portion which is located at said front segment and is provided with a plastic cap having a recess to accommodate therein a first coil spring which has one end urging a shoulder formed by said front segment and said mid-segment and which has another end urging a bottom surface of said recess;
- wherein said locking bolt includes a strip slot situated at said first position at such time when said locking bolt is pushed by said first coil spring until a front slot wall of said strip slot is in contact with a pin located at a position corresponding to said mid-segment of said horizontal through hole;
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- wherein said locking bolt is situated at said second position at such time when said locking bolt is acted on by an external force until a rear slot wall of said strip slot is in contact with said pin, with a rear end of said locking bolt extending into said rear segment of said horizontal through hole.