Carburetors
US4810427A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Apr 23, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/68
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A carburetor comprises a main body portion defining a venturi having an air intake side and an engine outlet side, a throttle shutter mounted within the venturi between the air intake side and the engine outlet side, a fuel chamber for supplying fuel into the venturi via a main discharge port and at least one idle discharge port, the main discharge port opening into the venturi on the air intake side of the throttle shutter, a choke feed passage extending from the fuel chamber to the venturi, the choke feed passage opening into the venturi on the opposite side of the throttle shutter to the main discharge port, and means for selectively opening and closing the choke feed passage. The fuel chamber comprises a metering diaphragm and the choke feed passage supplies pure fuel to the venturi, the carburetor being responsive to a lower pressure in the venturi on the engine outlet side of the throttle shutter than on the air intake side, when the throttle shutter is in a partially opened position and the choke feed passage is open, to cause fuel to be drawn from the fuel chamber primarily through the choke feed passage into the venturi on the engine outlet side of the throttle shutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.