EP0459699B1 - Scheibenhalteranordnung - Google Patents

Scheibenhalteranordnung Download PDF

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Publication number
EP0459699B1
EP0459699B1 EP91304655A EP91304655A EP0459699B1 EP 0459699 B1 EP0459699 B1 EP 0459699B1 EP 91304655 A EP91304655 A EP 91304655A EP 91304655 A EP91304655 A EP 91304655A EP 0459699 B1 EP0459699 B1 EP 0459699B1
Authority
EP
European Patent Office
Prior art keywords
disc
sheet
disc holder
fastener
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91304655A
Other languages
English (en)
French (fr)
Other versions
EP0459699A1 (de
Inventor
Yasuhiko C/O Sumitomo 3M Ltd. Nagano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0459699A1 publication Critical patent/EP0459699A1/de
Application granted granted Critical
Publication of EP0459699B1 publication Critical patent/EP0459699B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B24D9/085—Devices for mounting sheets on a backing plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor

Definitions

  • the present invention relates to a disc holder assembly of a rotary finishing device suitable for use in finishing surfaces of, for example, metallic members. More particularly, the invention is concerned with an improvement in a disc holder having a double-sided sheet fastener supplied by mating hook and loop fastening members.
  • a surface finishing disc such as an abrasive disc is fixed to a holder by means of screws.
  • a disc holder assembly in which, as shown in Fig. 3 of the drawing, a disc holder 30 and an abrasive disc 40 are detachably secured to each other by means of sheet fasteners 31 and 34 attached to the disc holder 30 and abrasive sheet 41, respectively.
  • sheet fasteners 31 and 34 attached to the disc holder 30 and abrasive sheet 41, respectively.
  • Sheet fasteners of the mating sheets of hook and loop fasteners such as that sold under the trade designation "Velcro" have been used US-A-3,883,998 discloses a disc holder assembly comprising a disc holder including means for attachment to a rotary tool, and a disc member which has a central opening, a surface finishing member on a first surface and a pressure sensitive adhesive coating on a second surface opposite to the said first surface.
  • the disc holder has a lower surface which includes a concave portion coaxially within a flat annular surface portion, and a mounting projection extending downwardly from a centre portion of the concave portion, the mounting projection having a shaft portion and a distal head portion having a head portion diameter somewhat larger than the diameter of the shaft portion.
  • the disc member central opening is temporarily expanded by a shoulder on the mounting projection whereby the disc member may be mounted with the central opening aligned round the shaft portion of the mounting projection and with the distal head portion protruding through the disc central opening.
  • the distal head portion of the mounting projection is recessed with respect to the plane of the working surface of the disc member.
  • a surface finishing disc holder assembly which employs bolts and nuts for securing an abrasive disc to the disc holder.
  • Such a prior art disc holder assembly requires a tool for attaching and detaching the abrasive disc to and from the disc holder.
  • the work of attaching and detaching the abrasive disc is quite laborious and time-consuming.
  • the known disc holder assembly relying upon sheet fasteners alone suffers from a problem in that the center of the abrasive disc tends to be offset from the center of the disc holder or the abrasive disc comes off the disc holder during high-speed rotation due to inadequate attachment between the fastener sheets.
  • this type of disc holder assembly permits easy attaching and detaching of the abrasive disc, it does not provide an easy way to correctly center the abrasive disc with respect to the disc holder during the assembly.
  • the present invention provides a surface finishing disc holder assembly which permits easy attaching and detaching of a surface finishing disc, easily centers the disc and exhibits a holding force high enough to prevent displacement or unintentional removal of the surface finishing disc during high-speed rotation.
  • a disc holder assembly comprising: a disc holder including means for attachment to a rotary tool, and a disc member, said disc member including a surface finishing member on a first surface, a fastening means on a second surface opposite to said first surface and a central opening extending through said disc member, said disc holder having a lower surface which includes a concave portion coaxially within a flat annular surface portion, a mounting projection extending downwards from a center portion of said concave portion and having a shaft portion having a shaft portion diameter and a distal head portion having a head portion diameter which is somewhat larger than said shaft diameter, said disc member central opening having a diameter which is substantially the same as said shaft portion diameter but which will elastically expand to permit the forced entry of said distal head portion, whereby said disc member may be mounted with said central opening aligned around said shaft portion of said mounting projection with said surface finishing member deployed in a plane for use, and said distal head portion protruding through said disc central opening and with the
  • the head portion of the projection on the disc holder member is inserted into the opening in the surface finishing disc member. Since the head portion has a greater diameter than the opening, the surface finishing disc member is elastically deformed to expand the opening to allow the head portion to pass through the opening.
  • the sheet fastener on the surface finishing disc member and the sheet fastener on the disc holder engage with each other to couple these members and, simultaneously, the head portion is firmly gripped by the edge of the opening in the surface finishing disc member.
  • the user For detaching the surface finishing disc member from the disc holder, the user simply pulls the disc member to separate the sheet fasteners on the disc holder and the disc member, so that both sheet fasteners are disengaged from each other. At the same time, the opening in the disc member is elastically spread so as to release the head portion, whereby the disc member is detached from the disc holder.
  • a disc-shaped disc holder 10 which may be made of hard molded plastic, is provided on the upper side thereof with a mounting hub 15 for receiving and fixing a drive shaft (not shown).
  • a female screw member 17 made, for example, of a metallic material is fixed in the mounting hub 15.
  • a removable cap 16 may be mounted in such a manner as to surround and protect the mounting hub 15. Removing cap 16 enables the disc holder to be attached to the shaft of the rotary device (not shown) such as a sander or grinder.
  • the disc holder 10 includes a substantially hemispherical recess or concave portion 11 on its lower surface which is concentric within the lower surface of holder 10.
  • Flat annular portion 18 surrounds concave portion 11 in the lower surface of disc holder 10.
  • a mounting projection 12 is secured to the center of concave portion 11 so as to project downwards therefrom.
  • Mounting projection 12 has a distal head portion 13 of a diameter slightly greater than the diameter of shaft portion 13a on which distal head portion 13 is mounted.
  • a hook sheet 14 of a sheet fastener is fixed to flat annular portion 18 of the lower surface of the disc holder 10 around hemispherical concave portion 11.
  • the head portion 13 projects slightly downwards to a point which does not extend as far as the abrasive face of abrasive sheet 21 of disc 20 when it is secured on disc holder 10.
  • Disc member 20 has a lower surface which may be provided by a flexible abrasive sheet 21 and an upper surface provided by a loop sheet 22 engageable with the hook sheet 14 on the disc holder.
  • the hook sheet 14 and the loop sheet 22 in cooperation provide a sheet fastener.
  • An opening 23 of a diameter substantially the same as the diameter of shaft portion 13a of mounting projection 12 but smaller than the diameter of head portion 13 is formed in the center of disc member 20.
  • comparatively short radial slits 24 are preferably formed so as to extend radially outwardly from the edge of opening 23.
  • One example employs a disc member which has an outside diameter of about 100 mm, a thickness ranging between 5 and 10 mm, and an opening 23 diameter of about 15 mm.
  • the arrangement may be modified such that the loop sheet and the hook sheet of the sheet fastener may be provided on the disc holder and the disc member, respectively.
  • Fig. 2 shows disc member 20 attached to disc holder 10.
  • the attaching of disc member 20 to the disc holder 10 is conducted in the following procedure.
  • the disc member 20 is placed such that both sheets of the sheet fasteners face each other, with the opening 23 in the disc member 20 aligned with the head portion 13 on mounting projection 12 of the disc holder 12.
  • the user presses, by his finger(s), the portion of the disc member around the opening. Since the diameter of the opening 23 is slightly smaller than the diameter of the head portion 13, the edge of the opening 23 is slightly elastically deformed to increase the diameter of the opening 23, whereby the head portion 13 is forcibly inserted into the opening 23 so as to be firmly gripped by the edge of the opening 23.
  • the open end of the cap 16 shown in Fig. 1 may be pressed against disc 20 to apply a force to a region around the opening.
  • the inside diameter of the open end of the cap 16 is dimensioned to be slightly greater than the outside diameter of the head portion of the disc holder, so that it can fully drive the head portion 13 into the opening 23.
  • the portion of the disc holder around the opening 23 is firmly clamped between the projection 12 and the lower surface of the disc holder 10 and is retained by the head portion 13 of the projection.
  • the projection 12 and the head portion 13 are so sized that the head portion 13 does not project beyond the working face (e.g. abrasive face) of the disc member.
  • the disc holder assembly of the present invention having the described feature permits an easy and prompt attaching and detaching of the disc member without requiring the troublesome work centering the abrasive. Furthermore, a high holding force is obtained for holding a surface finishing sheet such as an abrasive sheet, thus eliminating any risk for the disc to be offset or to come off the disc holder even when the device is operated at high speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (3)

  1. Scheibenhalteranordnung mit: einem Scheibenhalter (10), der eine Einrichtung (15) zur Anbringung an einer Drehvorrichtung umfaßt sowie ein Scheibenelement (20), wobei das Scheibenelement auf einer ersten Oberfläche ein Oberflächenbehandlungselement (21) aufweist sowie eine Befestigungseinrichtung (22) auf einer zweiten Oberfläche, die gegenüber der ersten Oberfläche liegt und eine zentrale Öffnung (25), die sich durch das Scheibenelement (20) erstreckt, wobei der Scheibenhalter eine untere Oberfläche aufweist, die ein koaxiales konkaves Teilstück (11) in einem flachen, ringförmigen Oberflächenstück (18) umfaßt; einem Befestigungsvorsprung (13), der sich von einem Mittelstück des konkaven Teilstücks (11) nach unten erstreckt und mit einem Wellenteilstück (12) mit einem Wellenteilstücksdurchmesser und mit einem fernen Kopfstück mit einem Kopftstückdurchmesser, der etwas größer ist als der Wellendurchmesser, wobei die zentrale Öffnung (25) des Scheibenelements einen Durchmesser aufweist, der im wesentlichen dem Wellenteilstücksdurchmesser entspricht, der sich jedoch ausdehnt, so daß das ferne Kopfstück zwangsfläufig eingeführt werden kann, wodurch das Scheibenelement (20) so angebracht werden kann, daß die zentrale Öffnung um das Wellenteilstück des Befestigungsvorsprungs ausgerichtet ist, wobei das Oberflächenbehandlungselement zur Anwendung in einer Ebene entfaltet ist und wobei das ferne Kopfstück durch die zentrale Öffnung der Scheibe vorsteht und wobei sich der ferne Kopf des Befestigungsvorsprungs (13) zu einem Punkt erstreckt, der sich von der Ebene einwärts befindet, dadurch gekennzeichnet, daß es sich bei der Befestigungseinrichtung (22) des Scheibenelements um ein erstes Lagenbefestigungselement handelt;
       daß an die ringförmige Oberfläche des Scheibenhalters ein zweites Lagenbefestigungselement (14) befestigt ist, welches so adaptiert ist, daß es lösbar an dem ersten Lagenbefestigungselement angebracht ist;
       daß die Öffnung des Scheibenelements mindestens einen Schlitz aufweist, der sich von der Kante der Öffnung nach außen erstreckt; und
       daß eines der Lagenbefestigungselemente eine Hakenbefestigungslage darstellt, während es sich bei dem anderen Lagenbefestigungselement um eine Ösenbefestigungslage handelt, wodurch die Haken- und Ösenbefestigungslagen lösbar angebracht sind, um das Scheibenelement (20) fest an dem Scheibenhalter (10) zu halten.
  2. Scheibenhalteranordnung nach Anspruch 1, ferner dadurch gekennzeichnet, daß es sich bei dem Oberflächenbehandlungselement um eine Schleifpapierlage handelt.
  3. Scheibenhalteranordnung nach Anspruch 1 oder 2, wobei folgendes gilt:

    2/3≦B/A≦4/5
    Figure imgb0005

    und

    1/3≦D/C≦2/3
    Figure imgb0006

    wobei
    A   gleich der Länge des Befestigungsvorsprungs ist;
    B   einen vertikalen Abstand zwischen einer äußeren Oberfläche des zweiten Lagenbefestigungselements und einer Unterseite des konkaven Teilstücks des Scheibenhalters darstellt;
    C   den Abstand zwischen der Mittelachse des Scheibenhalters und einer äußeren Umfangskante des zweiten Lagenbefestigungselements darstellt; und
    D   den Abstand zwischen der Mittelachse des Scheibenhalters und einer inneren Umfangskante des zweiten Lagenbefestigungselements darstellt.
EP91304655A 1990-05-25 1991-05-22 Scheibenhalteranordnung Expired - Lifetime EP0459699B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1990054180U JPH0715732Y2 (ja) 1990-05-25 1990-05-25 研磨用ディスクホルダ組立体
JP54180/90U 1990-05-25

Publications (2)

Publication Number Publication Date
EP0459699A1 EP0459699A1 (de) 1991-12-04
EP0459699B1 true EP0459699B1 (de) 1994-08-24

Family

ID=12963347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91304655A Expired - Lifetime EP0459699B1 (de) 1990-05-25 1991-05-22 Scheibenhalteranordnung

Country Status (6)

Country Link
EP (1) EP0459699B1 (de)
JP (1) JPH0715732Y2 (de)
KR (1) KR910019730A (de)
CA (1) CA2043055A1 (de)
DE (1) DE69103577T2 (de)
ES (1) ES2057771T3 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2298381A (en) * 1995-03-03 1996-09-04 Farecla Products Ltd Applicator head
JP3958387B2 (ja) * 1996-07-19 2007-08-15 スリーエム カンパニー ディスクホルダ
US6523215B2 (en) * 2001-04-04 2003-02-25 Saint-Gobain Abrasives Technology Company Polishing pad and system
US9914199B2 (en) 2013-12-09 2018-03-13 Saint-Gobain Abrasives, Inc. Abrasive disc
US9914197B2 (en) 2013-12-09 2018-03-13 Saint-Gobain Abrasives, Inc. Abrasive assembly having alignment elements
CN108115597A (zh) * 2017-12-26 2018-06-05 王文斌 组合减震降噪磨具

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991596A (en) * 1959-08-07 1961-07-11 Roy J Walters Back-up pad and abrasive sheet
US3436875A (en) * 1966-08-05 1969-04-08 Ralph R Cheney Abrasive disc holder
US3883998A (en) * 1974-02-11 1975-05-20 Minnesota Mining & Mfg Fastening device for psa abrasive disc
DE8214991U1 (de) * 1982-05-22 1982-12-16 Fabritius, Hans-Josef, 4400 Münster Schleifscheibe
DE3319925C1 (de) * 1983-06-01 1984-07-12 Bayerische Motoren Werke AG, 8000 München Spannvorichtung zum Halten eines Schleifblattes mit Befestigungslaschen an einem drehbaren Schleifteller
US4541207A (en) * 1984-02-06 1985-09-17 Flo-Pac Corporation Pull-apart mounting hub

Also Published As

Publication number Publication date
KR910019730A (ko) 1991-12-19
JPH0715732Y2 (ja) 1995-04-12
DE69103577D1 (de) 1994-09-29
CA2043055A1 (en) 1991-11-26
EP0459699A1 (de) 1991-12-04
DE69103577T2 (de) 1995-03-23
JPH0470468U (de) 1992-06-22
ES2057771T3 (es) 1994-10-16

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