Glenn R Knowlton

US Patent:

60771569, Jun 20, 2000

Filed:

Dec 16, 1998

Appl. No.:

9/212713

Inventors:

Rajul Amin - Northborough MA
Joseph Mielinski - Charlton MA
Glenn R. Knowlton - Sterling MA

Assignee:

Norton Company - Worcester MA

International Classification:

B24B 700

US Classification:

451548

Abstract:

Abrasive discs with spaced portions removed from the circumference in the form of rounded and elongated V-shapes provide, when in use, complete vision of a workpiece being abraded with reduced tendency to snag on obstructions.

US Patent:

61590894, Dec 12, 2000

Filed:

Apr 30, 1999

Appl. No.:

9/303213

Inventors:

Rajul Amin - Northborough MA
Joseph Mielinski - Charlton MA
Glenn R. Knowlton - Sterling MA

Assignee:

Norton Company - Worcester MA

International Classification:

B23F 2103

US Classification:

451548

Abstract:

The invention describes an abrasive system comprising a fiber-backed abrasive disc and a backup pad in which the backup pad has spaced portions removed from the circumference such that the disc overlaps in the area of the removed portions. This has the effect of inhibiting catching of the disc on obstructions and enabling easy swarf removal during operation.

US Patent:

60629657, May 16, 2000

Filed:

Jun 3, 1999

Appl. No.:

9/325201

Inventors:

Glenn R. Knowlton - Sterling MA

Assignee:

Norton Company - Worcester MA

International Classification:

B24D 1700

US Classification:

451490

Abstract:

This invention provides an improved backup pad for an abrasive disk adapted to permit a view of surface as it is being ground which comprises a compressible pad and a relatively rigid support member laminated to the pad that has shorter radial dimensions than the pad in those portions of the circumference of the pad that are likely to snag an angled surface during grinding. The result is that abrasive disks borne on the pad are less likely to tear from such contact.