Black Decker Inc.

Vladimir S Karnicki

Russell M Timmons

A tool element subassembly, such as an abrasive disc subassembly, for mounting to the spindle of a grinder. The subassembly includes an abrasive disc, a collar nut and, optionally, a backing flange. The central bore in the abrasive disc as well as the hub portion of the collar nut which fits into the bore are both hexagonally shaped to provide a positive drive connection therebetween. The collar nut is either press fit onto the disc or, alternatively, placed directly into the mold for the disc so that the formed abrasive disc is molded directly to the hub portion of the collar nut. In certain embodiments the collar nut includes an integrally formed, enlarged head portion that is adapted to engage the bottom surface of the abrasive disc and is configured to receive a wrench for tightening the subassembly onto, or loosening the subassembly for removal from, the spindle. In other alternative embodiments the collar nut includes an integral enlarged circular flange that is adapted to engage the top surface of the abrasive disc and an annular lip portion that initially protrudes from the bottom of the collar nut and is adapted to be deformed so as to engage the bottom surface of the abrasive disc and tightly secure the abrasive disc between the enlarged flange portion and deformed lip portion of the collar nut. The collar nut in these embodiments also includes an upper portion above the flange that is configured for receiving a wrench. Additional alternative embodiments are disclosed.

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Baltimore, MD, United States of America

Vladimir S Karnicki