The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1991
Filed:
Mar. 26, 1990
Willis E Tupper, Pinckney, MI (US);
Donald A Koengeter, Chelsea, MI (US);
Other;
Abstract
The present invention is a fuel primer pump capable of manually injecting fuel into the carburetor of an internal combustion engine, and is adapted to include both enrichment and shut-off positions. The primer pump includes a housing sealed at one end by an end cap which defines inlet and outlet openings. An internal piston is disposed within the housing for manual pumping of fuel. A relatively free floating valve pin, mounted on the internal piston, prevents an unwanted flow of fuel through the primer pump when the pump is disposed in the shut-off position. The valve pin is slidably retained within a cavity in the piston which opens onto the face of the piston proximate the end cap defining the outlet passageway. The valve pin is spring biased toward the outlet passageway and centers itself in the passageway seat due to the free floating nature thereof. The valve pin becomes disengaged from the seat when the primer pump is placed in the enrichment position, allowing the flow of fuel through the primer pump. Check valve assemblies communicating with the inlet and outlet openings operate to produce a flow of fuel to the carburetor during manual operation of the primer pump.