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. 30, 1980
Filed:
Aug. 06, 1979
Ramon Pareja, Edina, MN (US);
Lear Siegler, Inc., Santa Monica, CA (US);
Abstract
An improved pressure and vacuum seal arrangement for a piston-type pump utilizing a reciprocating plunger disposed within a cylindrical sleeve. The cylindrical sleeve is provided with a pressure seal assembly adjacent the outer end thereof and a vacuum seal assembly adjacent the inner end thereof, along with an annular groove formed between the two seal assemblies to isolate the vacuum seal from the pressure seal. The annular groove, which extends around the entire inner peripheral surface of the cylindrical sleeve is in communication with the pump inlet. The pressure seal assembly comprises a generally 'U'-shaped cup held between inner and outer retaining discs, and wherein the inner retaining disc is disposed with its inner peripheral edge surface in normal running contact with the surface of the plunger and with the inner disc consisting of polytetrafluoroethylene. The vacuum seal assembly comprises a carbon guide adjacent the inner end of the cylindrical sleeve and an adjacent vacuum seal sleeve formed of polytetrafluoroethylene. The polytetrafluoroethylene sleeve is disposed outwardly of the carbon guide and resilient means are provided for biasing the inner peripheral surface of the vacuum sleeve against the outer peripheral surface of the plunger.