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:
May. 09, 2006
Filed:
Dec. 04, 2002
Hidekazu Michioka, Tokyo-to, JP;
Yasuyuki Abe, Tokyo-to, JP;
Hiroshi Niwa, Tokyo-to, JP;
Katsuya Iida, Tokyo-to, JP;
Toshiaki Kadono, Tokyo-to, JP;
Takeki Shirai, Tokyo-to, JP;
Hironori Shoji, Tokyo-to, JP;
Hidekazu Michioka, Tokyo-to, JP;
Yasuyuki Abe, Tokyo-to, JP;
Hiroshi Niwa, Tokyo-to, JP;
Katsuya Iida, Tokyo-to, JP;
Toshiaki Kadono, Tokyo-to, JP;
Takeki Shirai, Tokyo-to, JP;
Hironori Shoji, Tokyo-to, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
A circulation member of a ball screw for circulating a ball rolling on a spiral ball rolling groove formed on a screw shaft. The circulation member includes a central portion and a pair of leg portions disposed at both ends of the central portion so as to extend therefrom, the leg portions having inner peripheries having center lines inclined in directions different from each other with respect to a center line of an inner periphery of said central portion. The leg portions also have outer peripheries having center lines being parallel to each other and have thicknesses, different in circumferential directions thereof, at cross sections in directions normal to center lines of the outer peripheries of the respective leg portions.