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:
Apr. 04, 1989
Filed:
Feb. 19, 1988
William B Scobie, Houston, TX (US);
Keystone International, Inc., Houston, TX (US);
Abstract
A method of forming a finished torus of precise dimension which can be used to form piston segments for use in a rotary actuator in which a torus workpiece is rigidly mounted on a support in such a manner as to leave a first hemi-toroidal surface of the torus workpiece exposed, the support being mounted on a suitable means to rotate the torus workpiece about a fixed axis passing through the center of the torus workpiece, the first hemi-toroidal surface of the torus workpiece being turned with a circular cutting tool by moving the cutting tool in a semi-circular path across the first hemi-toroidal surface of the torus workpiece, then flipping over the torus workpiece and mounting it on the support while leaving a second hemi-toroidal surface of the torus workpiece exposed and once against moving the cutting tool in a semi-circular path across the second hemi-toroidal surface of the torus workpiece while the torus workpiece and support are rotated about the center axis of the torus to thereby produce a finished torus of second, smaller dimension. In forming pistons for use in a rotary actuator, the finished torus is cut into desired segments to form at least one piston segment.