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:
Jan. 14, 2003
Filed:
Jul. 05, 2001
Delta Tooling Co., Ltd., Hiroshima, JP;
Abstract
A vibration damping apparatus using a magnetic circuit which is easier and less expensive to manufacture than conventional apparatus is provided. The apparatus comprises a moving member placed to move relatively away from and close to magnets and and made of a magnetic material which generates attraction force between the moving member and the magnets and , metal springs and as elastic members urging the moving member in a direction in which the moving member approaches the magnets and , and rubbers and as cushioning members mounted on predetermined positions to prevent the moving member from coming in contact with the magnets and . A negative spring constant is created by using an attracting magnetic circuit formed between the magnets and and the moving member , and to this, the elastic force of the metal springs and having a positive spring constant with the same value as the negative spring constant is added, whereby a total spring constant within a predetermined range of displacement can be set to substantially near zero by a very simple configuration.