Vacuum motor

A vacuum driven motor comprising a housing including a stator with a cylindrical rotor chamber, a cylindrical rotor eccentrically journaled for rotation within the stator chamber said rotor having an axially projecting portion extending outwardly of the stator, said rotor including a plurality of circumferentially spaced radially extending slits and a rotor vane radially slidably captivated in each slit between the stator and the rotor, said stator including a liner means of sleeve form between the rotor and the stator, said sleeve having a first and second circumferentially spaced, radially extending through opening for fluid flow into and out of the space between said rotor and said sleeve, said through opening being circumferentially spaced a first predetermined distance from one another, said housing having an acurate slot extending a distance greater than said first predetermined distance, a circumferentially movable arcuate control member slidably captivated in said slot, said member having a first and second circumferentially spaced radially extending passageway and with an intermediately arcuate through mouth of a circumferential span less then said first perdetermined distance, the control member passageways being spaced a distance greater than said first predetermined distance and said slidable member being arcuately movable slidably in the slot for circumferential movement of the member relative to the sleeve to register selectively one of the sleeve openings with the arcuate mouth and one of the passageways of the slidable member with one of the sleeve openings with the other of the passageways of the slidable member being closed to complete a passageway communicating with a suction source on one side of a vane between the sleeve openings and a passageway communicating with ambient pressure on the other side of the said vane between the sleeve openings, said vanes being equi-spaced from one another a distance less than said predetermined distance.