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. 10, 2011
Filed:
Aug. 26, 2004
Kazuyoshi Koizumi, Sagamihara, JP;
Shunsuke Okabayashi, Toyota, JP;
Ken Hayashi, Aichi-ken, JP;
Yoshihisa Takei, Sagamihara, JP;
Kazuyoshi Koizumi, Sagamihara, JP;
Shunsuke Okabayashi, Toyota, JP;
Ken Hayashi, Aichi-ken, JP;
Yoshihisa Takei, Sagamihara, JP;
Nifco Inc., Yokohama-Shi, Kanagawa, JP;
Abstract
A rotary damper (D) is constituted by: housings (); a silicon oil () being housed inside the housings (); a rotor () wherein a resistive portion () moving through the silicon oilinside the housings () is provided in an axial portion () which is housed inside the housings () and projects from the housings (); and an O-ring () preventing the silicon oil () from leaking between the axial portion () and the housing (), and multiple arc-like through-bores () are provided in the resistive portion () on a concentric circle, and depressed grooves () communicating with the arc-like through-bores () are provided. Accordingly, during the assembly, the air being mixed into the housing is not allowed to be excessively compressed, so that even if the rotor rotates bi-directionally, the noise being caused by the air being mixed into the housing can be prevented.