Abstract: 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.

Abstract: 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.