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. 24, 2009
Filed:
Jun. 19, 2007
Takahide Nomura, Tokyo, JP;
KE Son, Tokyo, JP;
Takahide Nomura, Tokyo, JP;
Ke Son, Tokyo, JP;
Nambu Co., Ltd, Tokyo, JP;
Abstract
In a cylinder device of the present invention, based on a screwing relationship between a screw rodand a ball screw mechanismand through oil supply port control, the piston and sleeveis made to advance or retract while being rotated. A rear end side of a rodis fitted into a sleeve portionof the piston and sleeve. Then, a fitting and coupling mechanism that uses an engagement keyand a key groovecauses only a rotation torque of the piston and sleeveto act on the rod. The rodwith a screw corecoupled thereto operates at a pitch defined by a screwing relationship between the rodand a rod cover. The pitch defined by the screwing relationship is the same as a pitch of the screw core