Throttle operating mechanism for carburetor

Claim 2

A throttle operating mechanism for a carburetor of an internal combustion engine, comprising a throttle actuating arm rotatable with a carburetor throttle valve to vary throttle opening and biased in a direction to close said carburetor throttle valve, a diaphragm disposed in a casing to define first and second chambers therein and having a check valve providing communication therebetween, an electromagnetically controlled plunger means connected to one side of said diaphragm and movable therewith, said plunger means having formed therein an air passage communicating with one of said first and second chambers, and an actuating rod connected to the other side of said diaphragm and movable therewith, said throttle actuating arm having an end portion engageable with said actuating rod, said air passage being closed by a valve head formed on said plunger means when the same is moved in one direction whereby movements of said actuating rod and accordingly said diaphragm are dampened whereas, when said plunger means is moved in another direction, said air passage is opened to release dampening effect thereby to allow quick return of said actuating rod.

Claim 3

A throttle operating mechanism as claimed in claim 1, further comprising first biasing means for biasing said throttle actuating arm in a direction to close said carburetor throttle valve, and second biasing means disposed between said diaphragm and said plunger means for biasing said diaphragm and said actuating rod in a direction in which said actuating rod engages said throttle actuating arm.

Claim 4

A throttle operating mechanism for a carburetor of an internal combustion engine, comprising a throttle actuating arm rotatable with a carburetor throttle valve, first biasing means connected to said throttle actuating arm for biasing the same in a direction to close said carburetor throttle valve, a casing attached to a carburetor casting, a diaphragm disposed in said casing to define first and second chambers therein and having check valve providing communication therebetween, said first chamber communicating with the atmosphere, an actuating rod connected to said diaphragm and extending from said first chamber outwardly of said casing, said actuating rod being engageable with an end portion of said throttle actuating arm, a valve plunger disposed in said second chamber of said casing and having formed therein an air passage providing communication between said second chamber and the atmosphere, said valve plunger also having a valve head engageable with a valve surface formed on said casing, an electrically controlled solenoid cOil surrounding said valve plunger and supported by said casing, and second biasing means disposed between said diaphragm and said valve plunger, said valve plunger being moved against the force of said second biasing means in a direction to cause said valve head to close said air passage thereby to prevent said second chamber from communicating with atmosphere whereby the atmospheric air in said first chamber is allowed into said second chamber through said check valve in said diaphragm for thereby allowing slow movement of said actuating rod connected to said diaphragm, and said valve plunger being moved in another direction to open said air passage to provide communication between said second chamber and the atmosphere whereby said actuating rod is allowed to quickly move to a position in which said carburetor throttle valve is closed.

Claim 5

A throttle operating mechanism for a carburetor of an internal combustion engine, comprising a throttle actuating arm rotatable with a carburetor throttle valve, first biasing means connected to said throttle actuating arm for biasing the same in a direction to close said carburetor throttle valve, a casing attached to a carburetor casting, a diaphragm disposed in said casing to define first and second chambers therein and having check valve providing communication therebetween, said first chamber communicating with the atmosphere, an actuating rod connected to said diaphragm and extending from said first chamber outwardly of said casing, said actuating rod being engageable with an end portion of said throttle actuating arm, a valve plunger disposed in said second chamber of said casing and having formed therein an air passage providing communication between said second chamber and the atmosphere, said valve plunger also having a valve head engageable with a valve surface formed on said casing, an electrically controlled solenoid cOil surrounding said valve plunger and supported by said casing, and second biasing means disposed between said diaphragm and said valve plunger, said valve plunger being moved against the force of said second biasing means in a direction to cause said valve head to close said air passage thereby to prevent said second chamber from communicating with atmosphere whereby the atmospheric air in said first chamber is allowed into said second chamber through said check valve in said diaphragm for thereby allowing slow movement of said actuating rod connected to said diaphragm, and said valve plunger being moved in another direction to open said air passage to provide communication between said second chamber and the atmosphere whereby said actuating rod is allowed to quickly move to a position in which said carburetor throttle valve is closed.

Claim 6

A throttle operating mechanism as claimed in claim 3, further comprising a throttle adjusting screw threaded in an end portion of said throttle actuating arm, said throttle adjusting screw having an end engageable with an end of said actuating rod.

Claim 7

A throttle operating mechanism as claimed in claim 3, further comprising an adjustable guide threaded in said casing and accommodating therein said actuating rod.

Claim 8

A throttle operating mechanism as claimed in claim 3, further comprising an adjustable stop screw threaded in a laterally extending flange and held in adjusted position to prevent excessive rotation of said throttle actuating arm and accordingly said carburetor throttle valve.

Claim 9

A throttle operating mechanism as claimed in claim 3, in which said check valve has apertures formed in disc plates disposed at both sides of said diaphragm, and a variable opening formed in said diaphragm and communicating with said apertures of said disc plates.