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:
Feb. 24, 2004
Filed:
Jun. 20, 2002
Sergio Rosso, Poirino, IT;
Giorgio Morra, Asti, IT;
Plaset S.p.A., Turin, IT;
Abstract
A pump is disclosed that comprises: (1) a support structure including a body having an annular end in which an opening is defined, and a volute connected to the said end of the body so as to define a pumping chamber therewith; (2) a bladed rotor disposed in the chamber and connected to a shaft which is mounted rotatably in the body and extends through the opening; and (3) a first and a second annular sealing member which are carried by the structure and which encircle the shaft in a leaktight manner. A lubrication chamber containing a lubricating grease is defined between the sealing members and the shaft. A first sealing ring, closer to the rotor, has an inner portion which forms at least one sealing lip which bears on the shaft, and a circular portion disposed outside the lip and having a substantially U-shaped cross-section with its convex side facing the rotor.