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:
Aug. 28, 1984
Filed:
Feb. 05, 1982
Aisin Seiki Kabushiki Kaisha, , JP;
Abstract
A cooling fan device for use with an internal combustion engine in which there is provided a viscous fluid coupling operable to control the speed of rotation of a fan for cooling a radiator in response to variation in the temperature of the engine. A partition plate is provided in a fluid-tight chamber so as to divide the chamber into a working chamber and a reservoir chamber. The partition plate has two holes which allow fluid flow from the reservoir chamber to the working chamber. Two valves, one for each hole, are provided which are normally biased to close the holes. One of the valves is attached to a slidable plug which moves in response to temperature change; the other valve is positioned to be engaged by the first valve. Changeover valves control the movement of the plug by allowing suction air pressure or atmospheric air pressure to enter a diaphragm at one end of the plug as the engine temperature varies and thereby open or close the holes.