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. 25, 1978
Filed:
May. 02, 1977
Applicant:
Inventors:
John B Lawson, Central Falls, RI (US);
Charles Simpson Cooper, Attleboro, MA (US);
Alfred Slocum Vail, Barrington, RI (US);
Assignee:
Lawson-Hemphill Inc., Central Falls, RI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24B / ;
U.S. Cl.
CPC ...
51 47 ; 51 99 ; 51228 ;
Abstract
A skate sharpener having a grinding wheel supported over the skate by a combined parallelogram and Watts linkage which guides the grinding element substantially parallel with the sharpened surface of the skate blade while keeping the grinding pressure constant; in preferred embodiments a tension spring forms one vertical link of the parallelogram linkage and a hydraulic cylinder, connected between the parallelogram linkage and the sharpener base, provides a smooth sharpening speed.