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:
Oct. 04, 1977
Filed:
Apr. 27, 1976
William S Jennings, West Covina, CA (US);
Clayton Manufacturing Company, El Monte, CA (US);
Abstract
A pressurized hot fluid washer includes a combination pumping unit driven by a closed hydraulic system which applies driving impulse forces to an interlocked liquid pump member and a fuel pump member. The liquid pump and fuel pump are hydraulically interlocked so that when liquid is not being discharged through the cleaning gun, the fuel will definitely be stopped. A static pressure line senses the pressure downstream of the liquid pump and transmits the pressure to one end of a spring biased by-pass spool valve. At a predetermined liquid pressure, the spool valve will sequentially close a hydraulic conduit first to deactivate the fuel pump and then open a by-pass conduit to deactivate the liquid pump member. Thus, both the fuel pump and the liquid pump will be automatically stopped, for example, when the cleaning gun is not being used. In addition, a differential area piston is provided in the hydraulic system between the by-pass spool valve and the fuel pump. The differential area piston reduces the high pressure required of the water supply to a more suitable pressure for the fuel pump.