Expendable unitary quick mount abrasive discs and support pad therefor

Abstract

The combination of an abrasive finishing device and a support member therefor. The support member includes a body having a threaded central opening with a flange at one end thereof. A fastening member having a threaded shaft and flange is permanently affixed to the abrasive finishing article by a resiliently deformable retainer press fitted over the threads on the shaft in such a manner that the flange on the fastening member is disposed entirely below the working surface of the abrasive finishing device. The retainer is a washer shaped member having an inner diameter which is less than the outer diameter of the threaded shaft on the fastening member and grips the thread on the shaft.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority of U.S. Provisional Patent Application No. 61 / 003,102 filed on Nov. 13, 2007, and the disclosure thereof is incorporated herein by reference and is a continuation in part of U.S. application Ser. No. 11 / 908,491 filed Sep. 12, 2007.FIELD OF THE INVENTION[0002]This invention relates generally to abrasive finishing articles and, more particularly, to the combination of an abrasive disc support pad and a disposable abrasive finishing disc in which the securing member affixed to the disposable abrasive finishing disc is entirely below the working surface of abrasive finishing particles contained on the abrasive disc.BACKGROUND OF THE INVENTION[0003]In the use of rotatably driven abrasive finishing articles and particularly coated abrasive finishing articles and non-woven fibrous abrasive material, such abrasive finishing articles are adapted for use on a wide range of air and electric powered tools. Traditional...

AI Technical Summary

Benefits of technology

[0009]The combination of an abrasive disc support member and a disposable abrasive finishing disc comprising a cylindrical body having an outwardly extending flange engaging the disc and defining a centrally disposed threaded opening therethrough. The opening adjacent the flange defining a cup shaped recess for receiving a central portion of the disc and an abrasive disc comprising a circular disc having first and second surfaces with abrasive finishing material on at least the first surface. A fastener member including a threaded shaft having a flange extending radially outwardly from one end thereof extending through an opening centrally disposed in the circular disc with the flange engaging the first surface of the disc and the threaded shaft extending beyond the second surface of the disc and a resiliently deformable retainer member press fitted over the threaded shaft, gripping the threads on the shaft and engaging the second surface of the disc with sufficient force to permanently secure the disc between the flange and the retainer member and to cause the flange to be entirely disposed below the first surface of the disc.

Problems solved by technology

The first of these is that by engagement of the rotating finishing disc against the work piece a large amount of torque is imported to the hub which tends to tighten the nut onto the threaded shaft of the power tool making it quite difficult to remove the nut in order to replace the disc after it is spent and usually involves the use of tools.

As a result, when considering the number of power tools which may be in use at any given time, there is an excessive amount of downtime necessitated by such disc replacement.

A second disadvantage is that the flange of the nut extends above the surface of the abrasive material on the finishing disc and the workers using the disc must be quite careful to prevent the flange on the nut from engaging the work piece which, in most cases, would impart damage to the work piece.

Such severely limits the surface area of the abrasive finishing material on the abrasive finishing disc which may be used in finishing the work piece.

The necessity of utilizing adhesive materials to secure the fastener to the abrasive finishing disc obviously increased the manufacturing costs both as a result of the increased amount of material and labor.

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