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2 stage vacuum motor

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Product Summary

A vacuum motor suitable for actuating a carburetor choke valve has primary and secondary stages responsive to separate vacuum signals. The secondary stage is carried by the primary stage and has a valve which opens upon full retraction of the primary stage to permit application of a vacuum signal to the secondary stage.

Numerous two-stage vacuum motors have been proposed heretofore; in general, however, use of a separate vacuum signal for each stage has required a complex structure having a separate vacuum responsive member for each stage. This invention provides a two-stage vacuum motor constructed to permit a single diaphragm to respond to two separate vacuum signals.

A two-stage vacuum motor comprising an outer housing, outer diaphragm means secured to said outer housing to form a primary chamber there between, an inner housing carried by said outer diaphragm means, inner diaphragm means secured to said inner housing to form a secondary chamber there between, a stem carried by said inner diaphragm means, primary and secondary springs respectively biasing said outer and inner diaphragm means away from said outer and inner housings, said inner housing having an opening from said secondary chamber to said primary chamber, and a valve biased to obstruct said opening and having an extension projecting toward said outer housing.

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