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:
Aug. 16, 1994
Filed:
Oct. 27, 1992
Derrick Heyl, Rollingstone, MN (US);
David M Terpstra, Winona, MN (US);
Hein-Werner Corporation, Waukesha, WI (US);
Abstract
Valve grinder comprising a grinding wheel mounted on a bench, said bench also having a surface for supporting a valve stem support stand mounted a spaced distance from said grinding wheel, said valve stem support stand comprising a pair of V-blocks and valve bearings for engaging the valve stem and an end stop. Mounted on said surface by a tandem axis pivot is a chuck for gripping the valve stem, said chuck including a positive clamping collet that engages the valve stem annularly with a plurality of contact points when the collet is squeezed between a collet spool and collet cover by a collet fork. Said chuck further rotates the valve while maintaining the positive clamping on the valve stem during the grinding operation but independently of the valve support stand.