Throttle valve arrangement for a carburetor

A throttle valve arrangement integrated into a body of a combustion engine carburetor, the throttle valve arrangement comprising:

• an axis of rotation;
• a throttle valve having a shaft supported rotatably by the body for rotation about the axis, the shaft having a distal end projecting outward from the body;
• a slave lever connected rigidly to the distal end, and projecting radially outward from the shaft, the slave lever having a planar portion disposed perpendicular to the axis and a hole spaced radially outward from the shaft for optional engagement of a Bowden wire for remote actuation of the throttle valve and for optional axial engagement of a local, manual, throttle valve actuator;
• and
• the throttle valve actuator have a bracket engaged rigidly to the body and a swivel member engaged rotatably to the bracket along the axis of rotation and is constructed and arranged to connect to the slave lever at the hole.

A throttle valve actuator of a carburetor throttle valve arrangement for local operation of a throttle valve of the throttle valve arrangement having a rotation axis, the throttle valve actuator comprising:

• a bracket constructed and arranged to rigidly engage a carburetor body over a slave lever of the throttle valve arrangement that rotates about the rotation axis;
• a swivel member engaged rotatably to the bracket and orientated co-axially with the rotating throttle valve of the carburetor throttle valve arrangement;
• and
• a coupling spaced radially outward from the axis and constructed and arranged between the slave lever and the swivel member.

A throttle valve arrangement for a combustion engine carburetor having a body, a fuel-and-air mixing passage through the body, a cylindrical cavity communicating transversely through the fuel-and-air mixing passage and along an axis and a fuel feed tube supported by the body and projecting co-axially with respect to the axis into the fuel-and-air mixing passage, the throttle valve arrangement comprising:

• a rotary throttle valve having a rotary throttle located rotatably in the cylindrical cavity;
• a cam relationship between the body and the rotary throttle for moving the rotary throttle axially during rotation;
• a through-bore of the rotary throttle that substantially aligns to the fuel-and-air mixing passage when the throttle valve is in a wide open throttle position and is substantially mis-aligned when in a closed position;
• a needle of the rotary throttle valve supported by the rotary throttle and projecting adjustably co-axially into the fuel feed tube to variably obstruct a fuel feed orifice of the fuel feed tube in the through-bore;
• a shaft of the rotary throttle valve projecting co-axially from the rotary throttle, out of the body and to a distal end;
• a slave lever engaged to the distal end;
• a bracket engaged to the body and bridging over the distal end and the slave lever;
• a swivel member journaled to the bracket and disposed co-axially to the shaft;
• and
• a coupling spaced radially from the axis and orientated between and carried by the slave lever and the swivel member, and constructed and arranged so that the swivel member rotates with the slave lever while the slave lever moves axially without axial movement of the swivel member.