Patent ID: 7128309

Claim:
An automatic choke system for a carburetor, comprising: a wax-type temperature sensing section attached to an engine; and an output section providing a connection between the temperature sensing section and a choke valve of the carburetor, and operated to open the choke valve in response to heat receiving operation of the temperature sensing section, wherein the temperature sensing section includes: a bottomed cylindrical housing attached to the engine with its bottom portion directed to a high-temperature portion of the engine; a bottomed movable cylinder; a stationary piston slidably supported in the movable cylinder and having one end protruding out of the movable cylinder; a wax contained in the movable cylinder in a sealed manner, and causing the movable cylinder and the stationary piston to move relative to each other in an axial direction; and a return spring urging the movable cylinder and the stationary piston in a direction to compress the wax, the movable cylinder being slidably housed in the housing in a state in which an outer end of the stationary piston abuts against an inner surface of the bottom portion of the housing, the output section being connected to the movable cylinder.