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

The patent text describes an improved flap-type abrasive disc pad for grinding and polishing operations. The pad has a relatively greater thickness in the center and a mounting section that can be easily detached and re-attached to the grinder shaft. The pad has a relatively even wear of the abrasive flaps and reduced vibration and runout compared to conventional disc pads. The pad can also accommodate grinding and polishing operations requiring different abrasive flap arrangements. The technical effects of the invention include improved efficiency, reduced vibration and runout, and improved wear distribution.

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 such prior art disc pads is their tendency to develop runout or vibration as a result of uneven wear of the overlapping abrasive flaps.

The resulting vibration compromises the quality of the griding or polishing operation and accelerates the fatigue of the operator.

While both uneven flap wear and the resulting vibration may be ameliorated by grinding or polishing as a lower rotational speed, such a lower speed slows down the grinding or polishing operation.

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