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:
Jul. 19, 2011
Filed:
Oct. 29, 2008
Toshihiko Takashima, Osaka, JP;
Takeshi Kondo, Osaka, JP;
Tomoyuki Saji, Osaka, JP;
Hiroko Ishida, Osaka, JP;
Masatoshi Sonoda, Osaka, JP;
Toshihiko Takashima, Osaka, JP;
Takeshi Kondo, Osaka, JP;
Tomoyuki Saji, Osaka, JP;
Hiroko Ishida, Osaka, JP;
Masatoshi Sonoda, Osaka, JP;
Tsubakimoto Chain Co., Osaka, JP;
Abstract
A hoisting and lowering driving engagement multi-row chain is disclosed, in which bending of the connecting pins in the chain is suppressed to avoid fatigue failure. Additionally, the load carrying balance in the chain width direction is improved, and contact vibrations and contact noises generated between the chain and the hoisting and lowering sprockets are suppressed. Endurance of the bush in the chain is thereby improved. Bending of connecting pins is avoided by press-fitting bushes, through which connecting pins pass, into intermediate tooth plates. This also improves load carrying balance widthwise. Contact noises and vibrations between the bushes and sprockets are suppressed by providing bushes with a separate sprocket engagement portion having a larger diameter than the press-fitting portion of the bushes.