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:
Aug. 04, 2009
Filed:
Mar. 14, 2005
Naoki Minowa, Tokyo, JP;
Hiroshi Yoshida, Tokyo, JP;
Akiyoshi Horikawa, Tokyo, JP;
Mitsuo Noda, Ichinomiya, JP;
Naoki Minowa, Tokyo, JP;
Hiroshi Yoshida, Tokyo, JP;
Akiyoshi Horikawa, Tokyo, JP;
Mitsuo Noda, Ichinomiya, JP;
Howa Machinery, Ltd., Kiyosu-Shi, JP;
Koganei Corporation, Tokyo, JP;
Abstract
Repulsive magnetic forces in the axial direction of cylinder tubes act between the rowsof inner magnets of pistonsaccommodated in two cylinder tubes, and the inner magnetsof the pistonscome to a halt being slightly deviated relative to the outer magnetsin the axial direction of the tube. Due to this deviation, a magnetic holding force Fc is produced between the inner and outer magnets. Since the magnetic holding force Fc is produced in a static state, a smooth movement can be attained from a static state suppressing the occurrence of a stick slip phenomenon at the start of movement as compared to the prior art, which does not produce the magnetic holding force in a static state.