Kelsey-hayes Company

John R Bruder

Gerald M Sivulka

Leonard T Tribe

The present invention provides an automatic cut off switch which grounds the magneto-spark plug circuit of a small gasoline engine shutting the engine down when the quantity of lubricating oil within the sump falls below a predetermined quantity. The switch is operated by a balance beam float assembly housed within a protective shroud. The protective shroud acts to collect a relatively stable pool of oil, representative of the quantity of oil remaining in the sump, for activation of the balance beam float. Upon refilling of the oil sump the switch automatically resets thereby permitting re-start of the engine.

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Ann Arbor, MI, United States of America

John R Bruder