Patent ID: 6910409

Claim:
A rack and pinion oscillating actuator comprising a pair of mutually parallel sliding holes formed in a body, the sliding holes being open at only one end, rack members having racks slidably fitted in the pair of sliding holes, respectively, an output shaft, having a pinion engaged with the racks, being rotatably supported by bearings arranged in the body, and the output shaft being rotated by reciprocation of the rack members on a basis of a supplying and discharging of compressed air, a pair of end members closing a respective one of the only end openings of each of the sliding holes arranged in the body, a fixed piston extending in an axial direction from a respective one of the end members internally within a respective one of the sliding holes and internally within a respective one of the rack members to a sealed, closed end cylindrical hole provided in the respective one of the rack members so as to relatively displace the rack members in an axial direction with respect to the sliding holes, and a fluid passage having one end portion communicating with a pipe port provided in each end member and another portion communicating through a flow passage of the piston with said sealed, closed end cylindrical hole provided in the respective one of the rack members so that upon alternate introduction of compressed air to the rack members through the pistons from the end members, the output shaft rotates in opposite directions.