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:
Jan. 29, 1991
Filed:
Aug. 23, 1990
Paul C Sheldon, Mequon, WI (US);
Edward E Kirkham, Brookfield, WI (US);
Kearney & Trecker, Milwaukee, WI (US);
Abstract
A machine includes a pair of spaced supports, one of which may mount an operator such as a tool in a spindle and the other of which may mount an object such as a workpiece. The spaced platforms are joined by six powered and extensible legs joined to the respective platforms by universal joints. The length of the legs is individually manipulated to vary the position of the platforms and therefore the object and operator relative to each other in six axes. The powered legs may be hydraulic cylinders or recirculating ball screw driven. The distance between the spaced platforms may be measured by separate instrument arms which join the platforms. The instrument arms may use a digital position device to measure the extension and contraction of the instrument arms or may use a laser interferometer for that purpose. The changes in the instrument arm's lengths may be used to generate signals which are used to control the extension and contraction of the powered legs. A method for converting the part program coordinate block instructions into instructions for varying the length of the powered legs.