ocr: WINDSHIELD WIPERS GEAR AND A CRANK convert the steady spin of an electric motor Ainto the back-and-forth motion ofa car's windshield wipers. A worm gear on the motor shaft turns a small gear wheel. This o wheel also acts as a crank because it has a connecting rod fixed RACK near its rim. The connecting rod drives a rack, which moves back and forth as the gear wheel turns. The rack meshes with pinion gears on the wiper blades. - - - - - C Asna - CONNECTING U a - ROD CRANK E ANIRE WORM GEAR - - a F MOTOR SHAFT PINION
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