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. 18, 2009
Filed:
Apr. 12, 2007
Masayuki Nishiyama, Hiroshima, JP;
Masayuki Nishiyama, Hiroshima, JP;
Nifco Inc., Yokohama-Shi, Kanagawa, JP;
Abstract
A damper includes a cylindrical housing, a rotor rotatably disposed in the housing and having a cylindrical shaft portion and a wing portion radially outwardly extending from the shaft portion, a control valve member disposed between the housing and the shaft portion to cover the wing portion, and a viscous fluid filled inside the housing. The wing portion has an asymmetric shape with respect to a rotational direction of the rotor relative to a straight line extending radially from the shaft portion. The wing portion includes a tip side surface, and a back end side surface. The control valve member includes a first inner surface facing a sloping surface parallel thereto, and a second inner surface facing a flat surface parallel thereto.