Bilateral abrasive disc pad

Abstract

A bilateral abrasive disc pad is provided comprising a cylindrical mounting section, an inner annular section, and an outer annular section to which abrasive flaps are attached in an overlapping relationship. The cylindrical mounting section has a central screw-threaded mounting hole for threadedly connecting to a threaded driven shaft of a grinder. The outer annular section of one side is flat, while the outer annular section of the opposing side is convex. The cylindrical mounting section is substantially thicker than the outer annular section such that the ratio of the mass of the outer annular section to the mass of the combination of the cylindrical mounting section and the inner annular section is 2 to 1 or less. Such thickening of the central mounting section reduces runoff and vibration caused by uneven wear of the abrasive flaps and allows the pad to be securely attached to the shaft of the grinder without the need for a mounting nut.

Description

FIELD OF THE INVENTION[0001]The invention relates to a bilateral abrasive disc pad for grinding, polishing, and lustering a workpiece.BACKGROUND OF THE INVENTION[0002]Abrasives are used for polishing, cleaning, finalizing, and giving an aesthetic appearance to a workpiece. The smoother surfaces created by abrasives can also promote corrosion resistance and fracture resistance. Therefore, continuous improvements and innovations are made on abrasives.[0003]One type of abrasive disc pad known in the art as a flap-type disc comprises a disc-shaped pad onto which a plurality of overlapping abrasive flaps are glued or otherwise attached. In use, the flap-type disc is detachably mounted to the shaft of a hand grinder and the surface of a workpiece is abraded by the rotating abrasive flaps with the help of electrical power. While such flap-type abrasive discs have a more complex structure than simple abrasive discs that utilize only a single circular sheet of abrasive material, they have th...

AI Technical Summary

Benefits of technology

[0009]The relatively greater thickness of the centrally-located mounting section and the provision of screw threads around the mounting hole obviates the need for a separate mounting nut to secure the inventive disc pad to the threaded driven shaft of the grinder. The disc pad may easily be unscrewed from and re-screwed to the threaded grinder shaft by pushing the shaft lock button on the grinder and manually applying torque to the edge of the disc pad. The relatively thicker mounting section and longer mounting hole also effectively distributes torque from the grinder shaft through a great enough area of the disc pad to avoid thread strippage despite the fact that the material used to form the disc pad is softer than the steel used to form the grinder shaft. Moreover, the higher concentration of mass of the disc pad toward its center (such that the ratio of the mass of the outer annual section to the mass of the combination of the cylindrical mounting section and the inner annular section is 2 to 1 or less) substantially reduces runout and unwanted vibration during the lifetime of the abrasive trips. By way of comparison, in a disc-shaped pad wherein the outer annular section began at the midpoint of the radius, the amount of mass of the outer annular section would be four times that of the remainder...

Problems solved by technology

The continuous exchanging of different abrasive discs slows the grinding operation and impairs productivity.

However, while such double-sided disc pads have increased operational efficiency, the applicant has observed several shortcomings which compromise the performance of such disc pads.

Such unscrewing and re-screwing of the mounting nut protracts the time necessary for a multi-stage grinding or polishing operation.

Another shortcoming associated with...

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