| Arbors and fasteners to afford two forms of easy/quick change mounting for abrasive discs -> Monitor Keywords |
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  Arbors and fasteners to afford two forms of easy/quick change mounting for abrasive discsRelated Patent Categories: Abrading, Tool Support For Flexible-member Tool, Including Headed, Axially Disposed, Tool Holding Member On Rotary Support, With Threaded Means To Retain Tool Holding MemberThe Patent Description & Claims data below is from USPTO Patent Application 20070141970. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates generally to abrasive finishing articles and more particularly, to a mounting structure for attaching coated abrasive finishing articles to the drive member of a power tool and to a coated abrasive finishing article with the mounting structure attached thereto. DESCRIPTION OF THE PRIOR ART [0002] The use of rotatably driven abrasive finishing articles and particularly coated abrasive finishing articles such as discs is widespread and familiar in our industrial society. Traditionally, such an abrasive disc is removably attached by way of a hub assembly including a disc support pad to a power tool. When the hub is rotated, the disc rotates with it permitting the moving disc abrasive surface to effectively finish the surface of work pieces. A variety of hub structures have been used in the prior art to secure the abrasive finishing disc to the power tool. [0003] The earliest and very common of such structures includes a support pad having a reinforced central aperture arranged to be engaged over the threaded end of the rotary shaft of the power tool. The abrasive finishing disc is placed on the flat surface of the pad and a flanged nut is turned down onto the threaded end of the rotary shaft protruding through the disc. When the nut is tightened, the flange lays flush against the abrasive surface of the disc and clamps the disc to the support pad. [0004] This traditional mode of attaching the abrasive finishing disc to the rotary power tool has two major disadvantages. The first of these is that in engagement of the rotating finishing disc against the work piece, a large amount of torque is imparted 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. In many heavy industrial applications, such abrasive discs have to be replaced quite often. 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. The second disadvantage is that the flange of the nut extends onto the abrasive surface of the finishing disc and the worker 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. [0005] In order to avoid the problems above referred to, a quick release abrasive finishing disc hub was developed and is most clearly shown in U.S. Pat. Nos. 3,667,169 and 3,667,170. As is disclosed therein, an adapter is provided which is adhesively adhered to the back surface of the abrasive finishing disc. One form of such adapter includes a raised boss having a central aperture whose rim is turned inward and shaped to form a screw thread which receives the threaded end of a stud attached to the power tool or the end of the power tool shaft. Another form is a threaded stud which engages a threaded bore on the power tool shaft. This allows the user to attach or remove the abrasive disc to the power tool rather quickly. It is apparent that through the utilization of such devices, the attaching structure is disposable along with the spent disc. As above noted, the attaching structure is an adapter formed to have a screw thread and is adhesively secured to the back of the coated abrasive disc. Such structures increase the cost of the materials and labor used in the abrasive finishing process. [0006] In view of the foregoing disadvantages of the prior art coated abrasive finishing disc mounts, it is desirable to provide a mounting device for coated abrasive finishing articles and particularly a coated abrasive finishing disc which is reusable or expendable and will provide the ability for the user to quickly and easily remove and mount abrasive finishing discs upon a portable power tool without the need for wrenches, screwdrivers, or other tools with or without the attachment of external adapters or other attachment devices directly to the abrasive finishing discs. [0007] A typical attachment of the type above referred to for securing a coated abrasive disc having a central aperture to the power tool with a nut having a flange is shown by the patent to G. L. Bryson, U.S. Pat. No. 2,699,020. An additional type of quick change structure in addition to the patents above referred to which includes an adapter secured to the abrasive discs is shown by the patent to Field, U.S. Pat. No. 3,653,858. SUMMARY OF THE INVENTION [0008] A disposable, reusable mounting apparatus for rotatably securing a coated abrasive finishing article to the drive member of a power tool which includes a support member and a nut adapted to extend through an aperture in the finishing article for engaging the finishing article with the power tool which comprises an outer surface on the body of the nut which is adapted to engage an edge of the aperture through the finishing article in an interference fit and an externally threaded shank for engagement with the power tool drive member, a support pad is provided defining a centrally located aperture and a face to engage the abrasive finishing article with the support pad having a reduced thickness region adjacent and surrounding the aperture therethrough. The support member further includes a hollow externally threaded cylinder having an outwardly extending flange at one end thereof and a compression ring. The support pad is secured between the flange and the compression ring to secure the support pad upon the cylinder. The end of the cylinder having the flange defines a recess to receive a flange extending outwardly from one end of the nut so that when assembled in operational configuration, the flange on the nut is below the abrasive finishing article surface so that it cannot engage a work piece during use. [0009] In the reusable mounting apparatus of the present invention the mounting nut includes an irregular surface on the body of the nut which is adapted to engage an edge of the aperture through the finishing article in an interference fit and when the coated abrasive finishing article is spent the nut may be popped out of the aperture in the finishing article and then reused with a new finishing article by inserting the nut through the central aperture therein. [0010] In the disposable mounting apparatus of the present invention the nut is formed of a plastic material and further includes a retention member which engages the body of the nut immediately adjacent the finishing article in an interference fit to secure the nut to the finishing article with the combination of the nut and the finishing article being disposed of when the finishing article is spent. BRIEF DESCRIPTION OF THE DRAWINGS [0011] FIG. 1 is a cross-sectional view of a coated abrasive finishing disc assembled with the reusable mounting device of the present invention; [0012] FIG. 2 is a partially exploded view of the structure as illustrated in FIG. 1; [0013] FIG. 3 is a partially exploded view of an embodiment of a disposable mounting structure in accordance with the present invention; [0014] FIG. 4 is a sideview of a disposable abrasive finishing disc with the nut of the present invention secured thereto; [0015] FIG. 5 illustrates the reusable attachment nut constructed in accordance with the principles of the present invention secured to a coated abrasive disc; and [0016] FIG. 6 illustrates in cross-section schematically one embodiment of a support pad constructed in accordance with the principles of the present invention. DETAILED DESCRIPTION [0017] Referring now more particularly to FIG. 1 there is illustrated schematically in cross-section, an reusable or reusable mounting device for coated abrasive discs constructed in accordance with the principles of the present invention with a coated abrasive member secured thereon. As is illustrated in FIG. 1, the support member constructed in accordance with the present invention is adapted to secure an abrasive finishing article 10 in the form of a coated abrasive disc having a first surface 12 with abrasive finishing material thereon and a second uncoated surface 14 on the opposite side thereof. The disc 10 defines an aperture 16 centrally disposed therethrough. A nut 18 having a flange 20 extending outwardly from one end thereof is pushed through the aperture in such a manner that an outer surface 22 having an irregular configuration forms a substantially interference fit with the edge 24 of the aperture. As will be described more fully herein below, the irregular surface may be formed by a plurality of alternating ridges and grooves which may take any shape desired and preferably would be disposed parallel with the axis 26 of the nut. The nut includes a shank 26 which is externally threaded so as to be received within the threaded end 28 of a drive member 30 which is adapted to be affixed to a power tool (not shown) but well known to those skilled in the art. A support pad 32 is provided and has a surface 34 which engages the surface 14 of the abrasive disc 10. The support pad also defines an aperture 35 centrally disposed therethrough. The surface 34 of the support pad 32 immediately adjacent the opening 35 therethrough has a reduced thickness which is adapted to receive a second flange 36 on a cylinder 42. The support pad 32 in accordance with a preferred embodiment of the present invention is useful with smaller discs and includes a semi-rigid member 38 which may be formed of plastic having an elastomeric material 40 secured thereto with the elastomeric material 40 engaging the surface 36 of the abrasive disc 10. The support member further includes the hollow cylindrical member 42 having an externally threaded surface 44. Threadably secured upon the external surface 44 is a compression ring 46. As is shown, the support pad 32 is disposed upon an outwardly extending lip or flange 36 of the cylindrical member 42. It should be apparent to those skilled in the art that the support pad 32 is captured between the flange 36 and the compression ring 46. It should also be noted that the flange 36 is received within the reduced thickness area of the support pad 32. The end of the cylinder adjacent the flange 36 defines a recess which is adapted to receive the flange 20 on the nut 18 so that when assembled on the mounting device, the flange 20 is below the abrasive finishing to particles on the surface 12 of the disc 10 to preclude the flange coming into contact with the work piece. [0018] If desired, an additional backing member or disc 50 may be provided along with the support pad 32 to provide additional rigidity. Depending upon the application and the rigidity desired, the additional backup disc 50 may be constructed of metal. Under those circumstances, it may also be desirable to provide an elastomeric washer 52 which is seated between the metal disc 50 and the compression ring 46 to assist in securing the back pad and supporting discs in proper relation to provide the support desired for the abrasive finishing disc 10. [0019] As is further shown in FIG. 1, the drive member 30 includes a flange 54 which seats against a surface 56 of the cylinder 42. The cylinder 42 defines an opening 58 through which the drive member extends. The lower portion of the drive member extending through the opening 58 carries an O-ring 6Q which provides frictional engagement with the opening 58. Through the frictional engagement, the support member is retained upon the drive member 30 during the time the coated abrasive disc 10 is detached for removal and replacement after it is spent. It is an important feature of the present invention that the support member is not in any way threadably attached to the drive member 30. It should be recognized that the support pad 32 along with the abrasive disc 10 is rotatable with respect to the drive member 30. As a result, the abrasive disc 10 and the support pad 32 may be rotated by hand to attach the nut 18 to the threads 28 on the drive member 30. Also, together (or simultaneously) the support pad along with the disc may be rotated in the opposite direction by hand once the disc is spent to remove the nut 18 from the threaded bore 28 of the drive member 30. Continue reading... Full patent description for Arbors and fasteners to afford two forms of easy/quick change mounting for abrasive discs Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Arbors and fasteners to afford two forms of easy/quick change mounting for abrasive discs patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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