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US 5,711,901 AGranted
Carburetor having temperature-compensated purge/primer
AssigneeWalbro Corporation
InventorsDavid L. Berg, Matthew A. Braun, Donald C. Ross
Life of this patent
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Abstract
A carburetor for a two or four stroke engine having a diaphragm chamber for supplying fuel to the air intake passage of the engine, and a reservoir for primer fuel. A manually operable pump or bulb draws fuel from the diaphragm chamber into the reservoir. An outlet passage leads from the reservoir to deliver primer fuel to the engine. A normally closed manually operable valve or button is provided for opening the outlet passage. The capacity or the reservoir is varied as a function of ambient temperature by a temperature compensator.
Claims7
A carburetor for an engine, the carburetor comprising
- a body having an air intake passage to the engine,
- a fluid supply port,
- a diaphragm chamber communicating with said fuel supply port for supplying fuel to the air intake passage,
- a cavity in the body,
- a movable partition extending across the cavity and dividing the cavity into a reservoir of variable volume for primer fuel at one side of the partition and a compartment at the other side thereof,
- a manually-operable pump for drawing fuel from said diaphragm chamber into said reservoir,
- an outlet passage leading from said reservoir to deliver primer fuel to the engine,
- a normally closed manually-operable valve for opening said outlet passage, means for varying the volume of said reservoir as a function of ambient temperature comprising a temperature compensator mounted in said compartment,
- a spring seat slidably guided in said compartment for movement toward and away from the partition and beating on said temperature compensator, and
- a spring compressed between said partition and said seat.
7 more elements
Dependencies are inferred from the claim text.