Primer
US4203405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1977 |
| Grant date | May 20, 1980 |
| Priority date | — |
| Expiry date | Nov 25, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for supplying a priming charge of a fuel-air mixture to a conventionally aspirated internal combustion engine is disclosed wherein a pliable primer bulb either integral with a carburetor or located remote therefrom may be operator depressed to decrease an air volume confined by that bulb forcing air from that volume into a comparatively smaller fuel well. Air flow into that fuel well forces fuel therefrom upwardly through a hollow cylindrical tube and into a constricted region in the carburetor throat to be mixed with air passing through that throat and into the engine. The tube leading from the fuel well into the constricted region or Venturi of the carburetor throat may additionally be provided with a small air hole in a side wall thereof into which additional air is injected during the priming operation to provide some initial air mixed in the fuel as that fuel is supplied to the carburetor throat. Fuel from a conventional float regulated chamber is supplied by gravity flow to replenish the fuel displaced from the priming well during the priming operation. The tube extending from the priming well into the carburetor throat may constitute the only operating j…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.