Gm Global Technolgoy Operations, Inc.

Burr E Stephens

Melvin H Hallmann

Gerald O Huntzinger

Kenneth H Clayton

A vacuum actuator, suitable for use in an automatic belt tensioning system, oscillates automatically when connected to a source of constant vacuum.

Self oscillating vacuum actuator

A belt tension controlling mechanism has a spring member which operates on a pulley support bracket to establish a tension in a belt trained on the pulley. The spring member surrounds a threaded sleeve which is rotated by a pair of selectively operable one-way ratcheting clutches which are simultaneously driven in opposite directions by a vacuum motor. The rotation of the sleeve results in linear meovement of a shaft connected to the pulley support bracket to thereby increase or decrease the belt tension, depending upon which clutch is operable.

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Anderson, IN, United States of America

Burr E Stephens