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. 11, 2001
Filed:
Apr. 25, 2000
John C. Dahlheimer, Laconia, NH (US);
Freudenberg-Nok General Partnership, Plymouth, MI (US);
Abstract
A water pump with a plurality of elastomeric blades on a rigid impeller is disclosed. The impeller has a tubular extension with a pair of flats on the outer diameter of the extension. The seal seat has a corresponding pair of flats on its inner diameter to engage the flats on the tubular extension for positive rotation. The impeller also has a retaining lip formed on its inner diameter and a sealing shoulder to form a retaining cavity along the tubular extension. The retaining lip receives the seal seat in the cavity by stretching the lip radially into a gap to accommodate the outer diameter of the seal seat. This stretch to fit feature eliminates the need to control the outer diameter of the seal ring to precise dimensions. The lip forms a static seal with the outer diameter of the seal seat. The elastomeric shoulder provides a static seal against the seal seat.