Gm Global Technolgoy Operations, Inc.

Rufus L Hawk

Ralph D Unterborn

A diaphragm pump comprises a diaphragm peripherally mounted in a housing to define a pump chamber and a gear chamber. A cam follower is reciprocably mounted in the gear chamber and secured to the diaphragm. A rotary cam-gear rotatably mounted in the gear chamber has an annular cam face engaging the cam follower to reciprocate the diaphragm when driven by an electric motor through a single stage reduction gear set. A compression spring located in the pump chamber expands the pump chamber and maintains the cam follower in engagement with the cam face.

Diaphragm pump

An idle speed control device of compact size has a miniature DC motor operably connected by a speed reducing gear train to drive a threaded shaft to adjust the position of a throttle stop for an engine throttle valve lever to thereby control engine idle speed wherein the throttle stop is initially moved by the throttle lever to close a normally open switch within the device to enable motor operation only during idle and wherein the threaded shaft disengages from the gear train when the throttle stop reaches a maximum throttle valve opening position while the motor continues to run and re-engages when the motor reverses.

Growing community of inventors

Xenia, OH, United States of America

Rufus L Hawk