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. 20, 1998
Filed:
May. 15, 1996
Robert E Rockwood, Windham, NH (US);
Environamics Corporation, Hudson, NH (US);
Abstract
A centrifugal pump having a system for preventing unscrewing of the impeller off of the pump shaft is disclosed. The impeller is screwed onto the pump shaft via threads having a first thread pitch, and a lock bolt is inserted through the impeller and screwed into the pump shaft via threads having a second thread pitch. The second thread pitch is greater than the first pitch. Accordingly, if the pump motor is operated in the wrong direction, the impeller is prevented from unscrewing because the impeller attempts to move faster axially than the lock bolt which is holding the impeller on the pump shaft.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile