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:
Apr. 27, 2004
Filed:
May. 17, 2002
Nobutoshi Orita, Itabashi-ku, JP;
Tok Bearing Co., Ltd., Tokyo, JP;
Abstract
A rotary damper has a casing having a fluid chamber filled with a fluid, a rotatable member disposed in the fluid chamber for rotation relative to the casing, a vane disposed on an outer circumferential surface of the rotatable member and extending in an axial direction thereof, the vane projecting toward an inner circumferential surface of the fluid chamber and having a first side and a second side opposite to the first side, a fluid passage for allowing the fluid to flow between the first side and the second side at or near a tip end of the vane, and a valve body mounted on the vane for selectively opening and closing the fluid passage. The valve body comprises a valve disposed in a position for closing the fluid passage and a spring for normally urging the valve in a direction to close the fluid passage. The valve and the spring are integrally formed. When the rotatable member rotates in a first direction, the valve opens the fluid passage against the urge of the spring under the pressure of the fluid on the first side of the vane. When the rotatable member stops against rotation, the valve instantaneously closes the fluid passage under the urge of the spring. When the rotatable member rotates in a second direction, the valve keeps closing the fluid passage under the urge of the spring and the pressure of the fluid on the second side of the vane.