Vacuum controlled throttle positioner and dashpot

In a control device for an internal combustion engine, said engine having a carburetor including a throttle, and linkage means operatively connected to the throttle of said carburetor, the improvement which comprises integral diaphragm actuated means for controlling the time required to return to a curb idle setting from a run position of said carburetor, and for permitting the throttle of said carburetor to close below its curb idle setting upon deactivation of said internal combustion engine, said diaphragm actuated means comprising a dash pot stem, said dash pot stem having an axial opening in it and a radial opening through it, said radial opening communicating with said axial opening, a diaphragm housing movably mounted on said valve stem, said housing defining a chamber, a first diaphragm assembly including a first flexible diaphragm mounted in said housing, said first flexible diaphragm dividing said chamber into a first chamber part and a second chamber part, the radial opening of said shaft communicating with said first chamber part, a second diaphragm assembly including a second flexible diaphragm movably mounted in said housing between a first position and a second position, said second diaphragm dividing said second chamber part into a third chamber part, a shaft mounted for movement with said second diaphragm and extending through said housing, said shaft and said dash pot stem being interconnectable with one another so that said second diaphragm assembly is movable along the second end of said valve stem.

An integral vacuum controlled throttle positioner and dash pot device for regulating a carburetor of an internal combustion engine, comprising:

• a dash pot stem having a first end and a second end, said valve stem having a passage through it, said passage being operatively connected to a source of engine vacuum on one end thereof;
• a diaphragm housing movably mounted on said dash pot stem, said diaphragm housing defining a chamber;
• a first diaphragm assembly including a first flexible diaphragm mounted in said chamber and dividing said chamber into a first chamber part and a second chamber part, said first chamber part communicating with the passage in said dash pot stem, and biasing means operatively connected between said first diaphragm and said housing on the first chamber part side of said first diaphragm assembly, said first diaphragm assembly being attached to said valve stem;
• a second diaphragm assembly including a second flexible diaphragm mounted in the second chamber part of said housing and being movable between at least a first position and a second position, a shaft attached to and movable with said second diaphragm, said shaft having a first end extending through said housing and a second end, the second end of said shaft and the second end of said dash pot stem being interconnected so as to permit movement of said shaft along said dash pot stem, and biasing means operatively connected between said housing and said second diaphragm assembly, said biasing means adapted to exert a force on said second diaphragm assembly tending to drive said second diaphragm toward one of its first and second positions.