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. 01, 2005
Filed:
Apr. 08, 2002
Kazuo Chikaraishi, Gunma-ken, JP;
Atsushi Maeda, Gunma-ken, JP;
Manabu Abe, Gunma-ken, JP;
NSK Ltd., Tokyo, JP;
Abstract
A frictional roller transmission comprises a first roller and a second roller disposed around two shafts which are separated from each other in such a manner that the two rollers are not brought into contact, a third roller and a fourth roller which are brought into contact with both the first and second rollers and are disposed between the first roller and the second roller and on an opposite side over a line connecting the center of the first roller and that of the second roller. An angle made by a tangential line between the first roller and the third roller (or the fourth roller) and a tangential line between the second roller and the third roller (or the fourth roller) is set at two times as large as an angle of friction obtained from a coefficient of friction between the respective rollers or smaller.