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:
Jul. 17, 1990
Filed:
Dec. 30, 1988
Kenneth J Cook, Troy, MI (US);
GTE Valenite Corporation, Troy, MI (US);
Abstract
A boring type tool includes mean for biasing a cutting bit in a first radial direction with respect to an axis of rotation and means for adjustably moving the cutting bit to a predetermined desired position against the force of the biasing means. The adjustable moving means includes a fluid pressure source for an incompressible electrorheological fluid and a means communicating with the fluid pressure source and the cutting bit for the flow of electrorheological fluid for adjustably moving the cutting bit in a direction opposing the first radial direction in proportion to pressure being generated by the fluid pressure source. A valve means is operably associated with the communicating means for effecting changes in the dynamic stiffness of the electrorheological fluid in response to an electric field. An electric field producing means is provided for transmitting a sufficient electric field to the valve means to substantially block the flow of electrorheological fluid to the cutting bit from the fluid pressure source and maintain a predetermined radial position of the cutting tool.