Patent ID: 8297598

Claim:
A simple start diaphragm carburetor comprising: a carburetor body, which is formed to be a main fuel supply channel comprising a gas inlet cavity, a venturi and a mixing cavity; a main adjutage, which is mounted on the venturi; a throttle subassembly, which comprises a throttle and a throttle spindle, the throttle is mounted in the mixing cavity and fixedly connects with the throttle spindle which is pivoted to the carburetor body hermetically, two ends of the throttle spindle protrude from the carburetor body to form a linkage end and a mounting end, respectively; and a rounded choke spindle, which is pivoted to a part of the carburetor body located at the gas inlet cavity hermetically, two ends of the choke spindle protrude from the carburetor body to form a linkage end and a fixing end, respectively; wherein the carburetor further comprises a linkage subassembly and a start fuel passage provided in the carburetor body for starting, a fuel inlet of the start fuel passage connects with a measuring room provided in the carburetor body, a fuel outlet of the start fuel passage connects with the mixing cavity, the linkage subassembly comprises a first linkage subassembly, a second linkage subassembly and a reset element, the carburetor body further comprises a receiving cavity which connects with the start fuel passage, the first linkage subassembly is contained in the receiving cavity smoothly and hermetically, one end of the first linkage subassembly is elastically pressed against a part of the carburetor body which is in the receiving cavity, the other end of the first linkage subassembly is pressed against the choke spindle, the second linkage subassembly comprises a first eccentric element mounted on the linkage end of the choke spindle and a second eccentric element fixed on the linkage end of the throttle spindle, the second eccentric element cooperates with the first eccentric element to form a linkage, the reset element is pressed between the first eccentric element and the carburetor body, wherein the choke spindle is started and rotated to cause the first linkage subassembly to open the start fuel passage and cause the second linkage subassembly to open the main fuel supply channel partially, rotate the throttle spindle to cause the choke spindle to be reset by the reset element thereby closing the start fuel passage.