Bicycle safety lights

Self-contained starboard and port light units receivable in the back-swept hollow, open-ended arms of a bicycle handlebar to provide light signals hat are highly visible to drivers of vehicle to the rear of the bicyclist, each unit comprising:

• A. a tubular battery case molded of synthetic plastic material having exterior wedging means constituted by tapered ribs forming wedging elements adapted to wedge the case into a handlebar arm, whereby the case is securely held therein, said case having a front end that projects from the open end of the arm;
• B. at least one cylindrical battery cell in said case whose positive pole is exposed at the front end of the case, and whose negative pole is connected to a fixed switch contact at the end of the front end of the case;
• and
• C. a rotatable beacon assembly removably coupled to the front end of the case, said assembly including a tubular mounting supporting a lens, and a light bulb disposed in the mounting whose center terminal engages the negative pole of the battery cell and whose base terminal is connected to a movable contact such that when the assembly is rotated to a given angular position, the movable contact engages the fixed contact to supply power to the bulb, said bulb being trapped in the assembly whereby to replace the bulb, the assembly is decoupled from the case which remains wedges in the arm;
• said mounting being provided with an externally-threaded shank, the front end of the case being externally threaded, and a union coupling the shank to the front end of the case.