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:
May. 18, 1976
Filed:
Jan. 14, 1975
Donald W Schoen, St. Paul, MN (US);
James M Silvernail, Minneapolis, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A control mechanism for apparatus for cleaning of fluid filters by a jet of fluid directed toward a filter in a direction reversed to that of the flow of fluid to be filtered through the filter element. An elongated manifold extends across the downstream or clean fluid delivery side of the filter element, and has a plurality of aligned apertures extending longitudinally of the manifold and facing the adjacent side of the filter element. A plurality of valve elements are mounted in the manifold for movement toward and away from closing relationship with the apertures, and are yieldingly urged toward closing relationship with their respective apertures. A rotary cam shaft is journaled in the manifold and includes a plurality of cams each associated with a different valve element. A pawl and ratchet arrangement is operative to open each of the valves in succession responsive to movement of the manifold across the side of the filter element. The cam arrangement is such that only one valve element is open at any one given time during the filter cleaning operation.