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:
Mar. 03, 2015
Filed:
Sep. 17, 2009
Takao Kobayashi, Nagano, JP;
Tanehira Amano, Nagano, JP;
Ikuomi Takahashi, Nagano, JP;
Takahiro Ito, Nagano, JP;
Takao Kobayashi, Nagano, JP;
Tanehira Amano, Nagano, JP;
Ikuomi Takahashi, Nagano, JP;
Takahiro Ito, Nagano, JP;
NHK Spring Co., Ltd., Nagano, JP;
Abstract
A tensioner having a simplified structure, using engaging teeth having increased strength and reduced backlash, constructed from a reduced number of parts, reduced in cost, and having increased design freedom. A tensioner comprises: a tubular member () having engaging teeth () formed thereon; one or more engaging elements () having formed thereon engaging teeth () engaging with the engaging teeth (); and a shaft member () provided inside the tubular member () and having an engaging-element receiving section () or an engaging-element supporting section which receives the engaging elements () of the tubular member (). Either the tubular member () or the shaft member () functions as an advancing member which is moved by urging force in an advancing and retracting manner. The tensioner is provided with a ratchet mechanism which, when the engaging elements () move in a diameter reducing direction and move over the engaging teeth of the tubular member (), allows the advancing member to advance forward, and when the engaging elements () move in a diameter expanding direction and engage with the engaging teeth of the tubular member (), prevents the advancing member to retract.