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:
Feb. 07, 1989
Filed:
Dec. 16, 1987
Takao Ushijima, Chigasaki, JP;
Takeshi Noguchi, Yokohama, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A vibration isolating apparatus is interposed between a vibration generating portion and a vibration receiving portion. The apparatus includes a main body which has a portion thereof constituted by a resilient member. The main body is provided with a liquid chamber which is capable of being expanded and contracted. The liquid chamber is divided by a partition member into small liquid chambers which are communicated with each other through an orifice. The orifice is able to absorb low-frequency vibrations but unable to absorb high-frequency vibrations. For this reason, a resilient membrane is provided between the small liquid chambers in such a manner as to suppress the rise in pressure inside the small liquid chambers so that high-frequency vibrations are also absorbed. It is possible to enhance the high-frequency vibration absorbing effect by providing, together with the resilient membrane, an opening means having a cross-sectional opening area which is larger than that of the orifice but smaller than the effective cross-sectional opening area of the resilient membrane.