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Publication numberUS3562968 A
Publication typeGrant
Publication dateFeb 16, 1971
Filing dateMar 12, 1969
Priority dateMar 12, 1969
Publication numberUS 3562968 A, US 3562968A, US-A-3562968, US3562968 A, US3562968A
InventorsJohnson Howard E, Knutson Arlie M, Meyer Vince
Original AssigneeMinnesota Mining & Mfg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Surface treating tool
US 3562968 A
Images(1)
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Description  (OCR text may contain errors)

Feb. 16, 1971 H E JQHNSON ETAL 3,562,968

SURFACE TREATING TOOL Filed March 12, 1969 l N VEN Top5 y' lcwAppk/OHNSON ,QL/E Nu-rso/v FIGB T//Ncf MEYER BY M] MJMJMM A T TOR/vf: Ys

United States Patent O 3,562,968 SURFACE TREATING TOOL Howard E. Johnson, St. Paul, Arlie M. Knutson, Oakdale,

and Vince Meyer, South St. Paul, Minn., assignors to Minnesota Mining and Manufacturing Company, St.

Paul, Minn., a corporation of Delaware Filed Mar. 12, 1969, Ser. No. 806,422 Int. Cl. B24d 17/00 U.S. Cl. 51-389 7 Claims ABSTRACT OF THE DISCLOSURE A rotary surface treating tool having a drive assembly and a quick `change abrasive disc or other surface treating device. The drive assembly has a hub with a cylindrical central opening having at least two helical ridged cams, and the back of the abrasive disc has a drive button with helically grooved complementary cam followers. The pitch of the cams and followers is steep, so that the disc can be mounted or demounted with no more than about one half turn.

BACKGROUND OF THE INVENTION This invention relates to tools employing coated abrasive discs and other surface treating devices.

Coated abrasive discs, which have existed for decades in a wide spectrum of constructions, can be used to remove stock, cut grooves, polish a surface, etc. These discs are typically designed for mounting on a rotary drive means. In order to utilize the versatility of such products, it is important that the tool be so constructed that the disc can be mounted and demounted with a minimum of effort. That this has been an objective of many inventors, is evidenced by the number of patents directed to quick change tools. To the best of our knowledge and belief, however, all tools heretofore known have suffered from one or more of such disadvantages as high cost of fabrication, excessively complicated mechanism, danger of damaging either the disc or the drive assembly during installation or removal, necessity for special mounting tools, inability to resist the torque encountered in normal use, tendency to mar the workpiece, etc.

SUMMARY OF THE INVENTION The present invention provides a surface treating tool in which the treating element can be easily installed and easily removed, both without wrenches or other tools. The surface treating unit is inexpensive, light weight, simple to fabricate, and simple to install or remove, and durable in use. Although particularly adapted for use with coated abrasive discs, the invention lends itself to the use of low density nonwoven abrasive products, polishing pads, brushes, and the like.

BRIEF DESCRIPTION OF THE DRAWING Understanding of the invention will be facilitated by reference to the accompanying drawing, in which like numbers refer to like parts in the several views, and in which:

FIG. 1 is an exploded view of the units making up the tool of this invention;

FIG. 2 is an edge view of the disc shown in FIG. 1; and

FIG. 3 is a cross sectional view of the drive assembly shown in FIG. 1, taken along section lines 3-3 and looking in the direction of the arrows.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings drive assembly comprises annular backup pad 11, typically formed of vulcanized rubber 3,562,968 Patented Feb. 16, 1971 reinforced with a layer of fabric F. Pad 11 is formed around and chemically and/or mechanically bonded to the outer surface of central hub I12, having front side 12a and rear side 12b. The outer portion of hub 12 comprises stepped sleeve 13, having tapered shoulder 13a, over which fabric F is conformed and adhered so that the centrifugal forces which will act on the bond therebetween will be exerted in shear, rather than in tension. In sleeve 13 is inserted split bushing 14, made up of halves 14a and 14b. Extending radially inward within bushing 14 are helical ridges, or cam segments, `15a and 15b, the helix angle of each such segment being rather steep, e.g., on the order of 15420", and preferably about 19.

Positioned within the opposite end of stepped sleeve 13 is plug 16, which is noncircular in cross section. Regular hexagonal plugs in which the diameter of the circumscribed circle is slightly greater than the diameter 0f the circumjacent interior of sleeve 16, may be pressed into sleeve 16 and firmly wedged in place. The upper portion of plug 16 is machined to remove a portion of the periphery and leave a circular neck 16a and a hexagonal head 16b. Split bushings 14a and 14b are complementarily formed, i.e., provided with a groove having a hexagonal periphery to accommodate head 16b and provided with a circular base for encompassing neck 16a. The end of plug 16 distal from the head 16b is drilled and tapped to accommodate complementarily threaded shank 17, nut 18 being used to fasten shank 17 firmly in position. The entire drive assembly 10 is thus so constructed that all of the component parts function as a unit, none rotating independently of the others.

Although hub 12 could be made of fewer component parts (c g., one part) the arrangement shown is inexpensive and simple. Thus, for example, split bushing parts :14a and 14b can be `die cast from zinc alloys, sleeve 13 quickly machined from an aluminum rod, and plug 16 is easily formed from a hexagonal cold rolled steel rod.

Surface treating assembly 20 comprises abrasive disc 30 and drive button 40, joined to each other by adhesive 21. Disc 30 in turn comprises backing 31 to which abrasive grains 35 are adherently bonded by adhesive 36. Preferably backing 31 is made up of a raw drills cloth layer 32 and a saturated drills cloth 33, joined by laminating adhesive 34.

Drive button 40, which is advantageously formed from ber-lled nylon, comprises a generally circular broad, thin, tapered, platelike, discoidal base member 41 from the center of which extends generally cylindrical stud 42. About the periphery of stud 42 are helical cam followers `43, the angle of the carn followers to the axes of stud 42 being the same as that of helical cam segments 15a and 15b to the axis of bushing 14 in drive assembly 10. The helix angle of cam followers 43 is such that the lead is at least about twice the length of the stud, thereby providing for complete seating of stud 42 in bushing 41 in no more than about one-half turn. It will, of course, be apparent that more than two helical cam segments and helical cam followers could be employed and the helix angle further increased, thereby providing for seating of stud 42 in less than one-half turn.

As has been implied from the foregoing, mounting of abrading assembly 20 on drive assembly 10 is accomplished very simply. Stud 42 is inserted into the central opening of bushing 14, so maneuvering the two with respect to each other that cam followers 43 engage cam segments 15a and 15b. Abrading assembly 20 is then rotated approximately carrying cam followers 43 nearly to the end of cams 15a and 15b. Additional locking of abrading assembly 20 against drive assembly 10 is effected by making the surface of backup pad 11 somewhat concave and also by providing a depression 19 in the surface around the periphery of stepped sleeve 13. When stud 42 is firmly seated, the surface of raw drills cloth layer 32, is in rm frictional engagement with the face of backup pad 11. Additional frictional engagement is provided at the shoulder adjacent depression 19.

What we claim is:

1. A rotary surface treating tool comprising in combination:

a drive assembly, comprising a hub means having front and rear sides, the rear side being adapted for being mounted on and rotated by the shaft of a motor or the like,

a cylindrical opening in the center of the front side of said hub means,

at least two helical cams, each integral with, and extending radially inwardly about a portion of, the circumference of said cylindrical opening,

a surface treating device, comprising a treating unit having a working face and a driving face said working face being adapted to abrade, polish, clean, or similarly treat a surface, said driving face having axed thereto and extending at right angles therefrom a generally cylindrical stud having at least two helically grooved cam followers generally complementary to said helical cams, each of said cam followers having a lead greater than the length of said stud, said stud being positioned within said cylindrical opening in a manner such that the cams and cam followers are firmly engaged.

2. The tool of claim 1 wherein the stud is integral with a broad, thin base, said base being adhered to the driving face of the surface treating device.

3. A drive assembly for use in the tool of claim 1, comprising in combination an annular backup pad surrounding and bonded to a central hub,

said backup pad being flexible and resilient and having a working face which displays a high lcoefficient of friction to cloth,

said central hub comprising a sleeve the exterior of which peripherally contacts the inner periphery of said backup pad,

a bushing inserted in said sleeve and firmly held therein, said bushinghaving a plurality of internally protruding helical ridges, each such ridge extending no more than halfway around the internal periphery of said bushing, and

being provided with means for attachment to a rotary drive means.

4. The drive assembly of claim 3 wherein the bushing is split diametrically into identical halves.

5. The drive assembly of claim 4 wherein the interior of the bushing is provided, adjacent the end distal to the working face of the backup pad, with a circumferential groove, and their is also provided a plug having a head complementary to said groove, said head being seated within said groove, said plug being drilled and threaded axially of said hub, and a threaded shank matingly engaged with the threads of said hub.

6. A surface treating device for use in the tool of claim 1 comprising in combination:

a disc formed of coated abrasive sheet material and having a back and a working face which is surfaced with abrasive grains,

a drive button adhered to the back of said disc, said drive button comprising a broad, thin tapered plate-like base, a generally cylindrical stud extending from the exposed surface of said plate,

said stud having at least two helical grooves, each groove having a helix angle of l5-20 and a lead equal to at least about twice the length of said stud.

7. A surface treating device for use in the tool of claim 1, comprising in combination:

a treating unit having a working face and a driving face,

said working face being adapted to abrade, polish, clean or similarly treat a surface,

said driving face having adhered thereto a drive button comprising a broad, thin tapered plate-like base, a generally cylindrical Stud extending from the exposed surface of said plate,

said stud having at least two helical grooves, each groove having a helix angle of 15-20 and a lead equal to at least about twice the length of said stud.

References Cited UNITED STATES PATENTS 571,066 1l/l896 Ebert 85 32(Int) 3,046,709 7/l962 'Cook 51-378 3,092,937 6/1963 Tocci-Guilbert 51-377 3,344,787 10/1967 Maclean 85-(32 Int UXF) OTHELL M. SIMPSON, Primary Examiner Us. C1. X.R. s1-35s UNITED STATES PATENT oFFlcE CERTIFICATE 0F CORRECTION Patent No. 3,562,966 Dated February 16, 1971 Inventor(s) Hmmm F. Johnson. Arle M, Knutson and Vince Meye It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 2, line lo, delete the numeral "16" and insert therefor -l3.

Column 2, line 19, delete the numeral "16" and insert therefor l3.

Column 2, line 56, delete the number "4l" and insert therefor --llI-.

,Signed and Sealed this Twenty-first Day of September 19' [SEAL] Attest.-

RUTH C. MASON C. MARSHALL DANN Atlesling Officer Commissioner nflalenls and Trademarks

Referenced by
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US3747286 *Jul 14, 1971Jul 24, 1973Standard AbrasivesAbrasive finishing article assembly
US4439953 *Nov 16, 1981Apr 3, 1984Merit Abrasive Products, Inc.Abrasive disc holder
US4601661 *Jul 21, 1980Jul 22, 1986Minnesota Mining And Manufacturing CompanyDental mandrel and detachable abrasive disk
US4871795 *Jul 22, 1988Oct 3, 1989Pawar Prakash KSilicone oil, silicone resin, nitrogen-phosphorus containing gassing agent
US4988294 *Dec 31, 1985Jan 29, 1991Minnesota Mining And Manufacturing CompanyDetachable abrasive disk
US5142829 *Jan 31, 1992Sep 1, 1992Minnesota Minning And Manufacturing CompanyFor abrading a workpiece
US5197998 *Jun 15, 1992Mar 30, 1993Minnesota Mining And Manufacturing CompanyMethod of making a folded abrasive article
US5273558 *Jul 1, 1992Dec 28, 1993Minnesota Mining And Manufacturing CompanyParticles dispersed in a polyurea matrix having hard and soft segments
US5316812 *Dec 20, 1991May 31, 1994Minnesota Mining And Manufacturing CompanyCoated abrasive backing
US5417726 *Feb 3, 1994May 23, 1995Minnesota Mining And Manufacturing CompanyCoated abrasive backing
US5482756 *Jul 22, 1994Jan 9, 1996Minnesota Mining And Manufacturing CompanyMultilayer rotatable disks of multilayer polymers
US5573619 *Oct 29, 1993Nov 12, 1996Minnesota Mining And Manufacturing CompanyMethod of making a coated abrasive belt with an endless, seamless backing
US5573844 *Jan 6, 1995Nov 12, 1996Minnesota Mining And Manufacturing CompanyConformable surface finishing article and method for manufacture of same
US5578096 *Aug 10, 1995Nov 26, 1996Minnesota Mining And Manufacturing CompanyReinforcing a backing loop substrate with a continuous fibrous strand or strip
US5580634 *Sep 26, 1994Dec 3, 1996Minnesota Mining And Manufacturing CompanyTough, and heat resistant thermoplastic binder and fibrous reinforcing material together form backing that is very stable during use
US5584897 *Dec 29, 1995Dec 17, 1996Minnesota Mining And Manufacturing CompanyMethod for making an endless coated abrasive article
US5609706 *May 8, 1995Mar 11, 1997Minnesota Mining And Manufacturing CompanyMethod of preparation of a coated abrasive belt with an endless, seamless backing
US5643068 *May 26, 1995Jul 1, 1997Minnesota Mining And Manufacturing CompanyAbrading wheel having individual sheet members
US5669941 *Jan 5, 1996Sep 23, 1997Minnesota Mining And Manufacturing CompanyCoated abrasive article
US5679067 *Apr 28, 1995Oct 21, 1997Minnesota Mining And Manufacturing CompanyMolded abrasive brush
US5681612 *Feb 20, 1996Oct 28, 1997Minnesota Mining And Manufacturing CompanyInserting fibrous material into drum, rotating to evenly distribute binder, solidifying to form flexible, endless, seamless substrate with fibrous material embedded in binder, coating abrasive onto substrate
US5830248 *Nov 21, 1996Nov 3, 1998Minnesota Mining & Manufacturing CompanyMethod for making a spliceless coated abrasive belt
US5849646 *Jul 7, 1997Dec 15, 1998Minnesota Mining & Manufacturing CompanyCoated abrasive backing
US5858140 *Jun 6, 1997Jan 12, 1999Minnesota Mining And Manufacturing CompanyNonwoven surface finishing articles reinforced with a polymer backing layer and method of making same
US5903951 *Oct 30, 1996May 18, 1999Minnesota Mining And Manufacturing CompanyMolded brush segment
US5915436 *Oct 30, 1996Jun 29, 1999Minnesota Mining And Manufacting CompanyAbrasive brush made by injection molding a moldable polymer optionally including abrasive particles.
US5924917 *Oct 24, 1997Jul 20, 1999Minnesota Mining And Manufacturing CompanyCoated abrasives and methods of preparation
US5931729 *Apr 15, 1997Aug 3, 1999Minnesota Mining And Manufacturing CompanyArticle made by spin welding a fastener thereto
US5964006 *Jan 13, 1997Oct 12, 19993M Innovative Properties CompanyRotary brush
US5983434 *Jul 15, 1997Nov 16, 1999Minnesota Mining And Manufacturing CompanyRotary bristle tool with preferentially oriented bristles
US6001202 *Mar 24, 1999Dec 14, 19993M Innovative Properties CompanyMethod for attaching a fastener to a surface treating article, and such an article having a fastener
US6066188 *Jul 16, 1998May 23, 2000Minnesota Mining And Manufacturing CompanyCoated abrasive belt with an endless seamless backing and method of preparation
US6083345 *Aug 12, 1998Jul 4, 2000Adolf Wurth Gmbh & Co. KgTool for removing adhesive residues or the like from substrates
US6086464 *Mar 5, 1999Jul 11, 2000Advanced Micro Devices, Inc.CMP platen plug
US6095910 *Nov 10, 1997Aug 1, 20003M Innovative Properties CompanySurface treatment article having a quick release fastener
US6126533 *Oct 17, 1997Oct 3, 20003M Innovative Properties CompanyMolded abrasive brush
US6136143 *Feb 23, 1998Oct 24, 20003M Innovative Properties CompanySurface treating article including a hub
US6138317 *Aug 31, 1999Oct 31, 20003M Innovative Properties CompanyRotary surface treatment tool
US6142858 *Nov 10, 1997Nov 7, 20003M Innovative Properties CompanyBackup pad for abrasive articles
US6179887Feb 17, 1999Jan 30, 20013M Innovative Properties CompanyMethod for making an abrasive article and abrasive articles thereof
US6183346Aug 5, 1998Feb 6, 20013M Innovative Properties CompanyAbrasive article with embossed isolation layer and methods of making and using
US6186866Aug 5, 1998Feb 13, 20013M Innovative Properties CompanyAbrasive article with separately formed front surface protrusions containing a grinding aid and methods of making and using
US6261156Jun 27, 2000Jul 17, 20013M Innovative Properties CompanyMolded abrasive brush
US6299508Aug 5, 1998Oct 9, 20013M Innovative Properties CompanyAbrasive article with integrally molded front surface protrusions containing a grinding aid and methods of making and using
US6312315Sep 29, 2000Nov 6, 20013M Innovative Properties CompanyAbrasive article with separately formed front surface protrusions containing a grinding aid and methods of making and using
US6352471Apr 13, 2000Mar 5, 20023M Innovative Properties CompanyAbrasive brush with filaments having plastic abrasive particles therein
US6354929Feb 17, 1999Mar 12, 20023M Innovative Properties CompanyAbrasive article and method of grinding glass
US6364747Oct 26, 2000Apr 2, 20023M Innovative Properties CompanyAbrasive article with embossed isolation layer and methods of making and using
US6371837Nov 2, 2000Apr 16, 20023M Innovative Properties CompanyMethod of refining a surface
US6406576Oct 17, 1996Jun 18, 20023M Innovative Properties CompanyMethod of making coated abrasive belt with an endless, seamless backing
US6406577Oct 17, 1996Jun 18, 20023M Innovative Properties CompanyMethod of making abrasive belt with an endless, seamless backing
US6413287Jun 28, 2000Jul 2, 20023M Innovative Properties CompanyReaction injection molded; polyurethane or polyurea binder; bristles with increased amount of particles; cleaning or polishing without damaging surface; brushes
US6458018Apr 23, 1999Oct 1, 20023M Innovative Properties CompanyAbrasive article suitable for abrading glass and glass ceramic workpieces
US6595839 *Nov 15, 2001Jul 22, 2003Clifford F. StaverSurface treatment tool
US6609951Jun 30, 2000Aug 26, 20033M Innovative Properties CompanyMethod of making a surface treating article
US6676499Jul 23, 2002Jan 13, 2004Stewart, Ii Joseph T. J.Male/female abrasive disk/wheel mounting member and subsequent abrasive mounting systems
US6722952Aug 29, 2001Apr 20, 20043M Innovative Properties CompanyAbrasive article suitable for abrading glass and glass ceramic workpieces
US6817935Jun 17, 2003Nov 16, 20043M Innovative Properties CompanyMethod of making a surface treating article and such a surface treating article
US7121924Apr 20, 2004Oct 17, 20063M Innovative Properties CompanyAbrasive articles, and methods of making and using the same
US7182682Sep 8, 2004Feb 27, 20073M Innovative Properties CompanyApparatus for making a surface treating article
US7618306Sep 22, 2005Nov 17, 20093M Innovative Properties CompanyConformable abrasive articles and methods of making and using the same
US8057281Mar 20, 2008Nov 15, 20113M Innovative Properties CompanyMethods of removing defects in surfaces
US8066786Jan 23, 2008Nov 29, 20113M Innovative Properties CompanyCoated abrasive disc and method of making the same
US8758089Aug 1, 2012Jun 24, 20143M Innovative Properties CompanyAbrasive articles, rotationally reciprocating tools, and methods
US8764517 *Feb 28, 2007Jul 1, 20143M Innovative Properties CompanyAbrasive article and method of making the same
US20100151778 *Feb 28, 2007Jun 17, 20103M Innovative Properties CompanyAbrasive article and method of making the same
EP0566761A1 *Apr 22, 1992Oct 27, 1993DIPL.-ING. GUENTER WENDT GmbHFlapsanding disc
EP0937544A2 *Feb 22, 1999Aug 25, 1999Merit Abrasives Europe Ltd.Surface treatment
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WO1998030129A1 *Dec 15, 1997Jul 16, 1998Minnesota Mining & MfgRotary surface treatment tool
WO1999024221A1 *Mar 6, 1998May 20, 1999Minnesota Mining & MfgSurface treatment article having a quick release fastener
WO1999024222A1 *Mar 6, 1998May 20, 1999Minnesota Mining & MfgBackup pad for abrasive articles, and method of use
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Classifications
U.S. Classification451/521
International ClassificationB24B45/00, B24D9/00, B24D9/08
Cooperative ClassificationB24B45/00, B24D9/085
European ClassificationB24B45/00, B24D9/08B