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. 13, 2012
Filed:
Apr. 27, 2007
Hiroshi Niwa, Tokyo, JP;
Akimasa Yoshida, Tokyo, JP;
Soshi Miyahara, Tokyo, JP;
Noriaki Chikamoto, Tokyo, JP;
Yasuhiro Kubota, Tokyo, JP;
Hiroshi Niwa, Tokyo, JP;
Akimasa Yoshida, Tokyo, JP;
Soshi Miyahara, Tokyo, JP;
Noriaki Chikamoto, Tokyo, JP;
Yasuhiro Kubota, Tokyo, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
Provided is a screw device capable of preventing occurrence of any elevation change at a joint between a ball return path of a circulation member and a loaded ball rolling groove of a nut. The circulation memberhas end partsandeach of which the periphery includes a rolling groove connecting partpositioned to the side of a loaded ball rolling grooveof a nutand connected to the loaded ball rolling grooveof the nutand a scooping partpositioned to the side of a ball rolling groove of a screw shaftand scoops up ballsfrom a loaded ball rolling path. The rolling groove connecting partof each of the end partsandis made of resin and formed integral with the nut