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:
Oct. 02, 2012
Filed:
Feb. 27, 2007
Ichiro Araie, Sakai, JP;
Shuichi Kawada, Sakai, JP;
Taro Hasegawa, Sakai, JP;
Sodick Co., Ltd., Kanagawa, JP;
Abstract
A spindle apparatus includes a rotatable first spindle () to which a tool can be attached. The first spindle is supported in a base with high precision using an air hydrostatic bearing. The spindle apparatus further includes a second spindle () capable of rotation about an axis substantially aligned with the axis of the first spindle, first connection means for electrically connecting a base side and the second spindle, and second connection means for electrically connecting the first spindle and the second spindle. Electrical connection between the base side and the first spindle is carried out via the first and second connection means. The first connection means is, for example, a brush (). The second connection means has a degree of mechanical freedom and is, for example, a flexible electrical wire () or a helical spring ().