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:
Dec. 13, 2022
Filed:
Jun. 19, 2019
Applicant:
Thk Co., Ltd., Tokyo, JP;
Inventors:
Kazuyoshi Mochizuki, Tokyo, JP;
Tetsuya Miura, Tokyo, JP;
Ryuji Muramatsu, Tokyo, JP;
Yusuke Todoroki, Tokyo, JP;
Assignee:
THK CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H 25/20 (2006.01); F16H 25/22 (2006.01); F16H 57/01 (2012.01); G01B 7/14 (2006.01);
U.S. Cl.
CPC ...
F16H 25/2015 (2013.01); F16H 25/20 (2013.01); F16H 25/2214 (2013.01); F16H 57/01 (2013.01); G01B 7/148 (2013.01); F16H 2057/012 (2013.01);
Abstract
A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.