EP0127812B1 - Einrichtung zum Befestigen eines Schleifblattes an einem drehbaren Schleifteller eines Schleifgeräts - Google Patents

Einrichtung zum Befestigen eines Schleifblattes an einem drehbaren Schleifteller eines Schleifgeräts Download PDF

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Publication number
EP0127812B1
EP0127812B1 EP84105502A EP84105502A EP0127812B1 EP 0127812 B1 EP0127812 B1 EP 0127812B1 EP 84105502 A EP84105502 A EP 84105502A EP 84105502 A EP84105502 A EP 84105502A EP 0127812 B1 EP0127812 B1 EP 0127812B1
Authority
EP
European Patent Office
Prior art keywords
sanding
counter
stop
conical
grinding
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
Application number
EP84105502A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0127812A1 (de
Inventor
Dieter Dr. König
Heinz Schickhaus
Johann Müller
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0127812A1 publication Critical patent/EP0127812A1/de
Application granted granted Critical
Publication of EP0127812B1 publication Critical patent/EP0127812B1/de
Expired 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

Definitions

  • the invention relates to a device for fastening a sanding sheet to a rotatable sanding plate of a grinding device, as described in the preamble of the main claim.
  • the relevant body parts are first coated with a primer or filler.
  • This base layer must be smoothed by sanding before the actual top coat can be applied.
  • Grinding is carried out with grinding devices which have a rotating grinding plate and a grinding sheet arranged thereon.
  • the sanding devices are manually guided over the surfaces to be sanded by a worker.
  • the sanding sheets are not attached to the sanding plate. If the sanding sheet moves relative to the sanding plate during the sanding process, the worker can easily correct this.
  • the grinding sheet must be attached to the grinding plate.
  • dry sanding in which the sanding sheet does not stick to the sanding plate due to adhesive forces as when wet sanding.
  • the sanding sheet slips with respect to the rotation of the sanding plate. This slip has an adverse effect on a fixed sanding sheet. It leads to warping of the sanding sheet and thus to surfaces that are not properly ground.
  • GB-A 666 035 shows the attachment of a sanding sheet to a sanding plate via a sleeve.
  • the sleeve is inserted through a hole in the central area of the sanding sheet and presses the sanding sheet against an elastic support of the sanding plate with a peripheral outer flange. In this way, the sanding sheet is able to rotate relative to the sanding plate.
  • this type of fixing of the sanding sheet should not be suitable for large-scale production. In particular, this construction means that the sanding sheet cannot be automatically attached to the sanding plate, which is a prerequisite for automated production.
  • a grinding device with a grinding plate is also known, on the underside of which a sanding sheet can be attached.
  • the attachment also takes place in the middle area of the sanding sheet.
  • the sanding sheet is over a clamping element that can be operated by a snap mechanism. pressed against the base of the sanding plate. Otherwise, however, the sanding sheet is not rotatable relative to the sanding plate.
  • the object of the invention is therefore to fasten the sanding sheet in a generic grinding device so that the slip in the rotation between the sanding plate and the grinding wheel can no longer have an effect and that the fastening is carried out safely.
  • the sanding sheet can possibly rotate more slowly than the sanding plate. Accordingly, it does not need to warp and can always lie with its entire surface on the surface to be sanded. This results in smooth, sanded surfaces of the primer material or filler, which in turn is a prerequisite for a good visual impression of the topcoat applied to it.
  • the automatic fastening can be achieved in an advantageous manner by the features set out in the subclaims.
  • the sanding sheet is tensioned in the middle area. This has the advantage that a conventional sanding sheet can be used for this, which has fastening tabs by means of star-shaped slits. Although parts of the grinding wheel are removed from grinding with such an internal fastening, these areas only make a small contribution to the grinding performance. The resulting reduced grinding performance of the grinding wheel can hardly be determined.
  • the counter-stop forming the clamping elements is rotatably held on the sanding plate or on a part fastened to the sanding plate by means of a roller bearing.
  • a roller bearing instead of the rolling bearing, a plain bearing could also be used, however, the function should not always be guaranteed here due to the heavy dirt development during grinding.
  • the sanding sheet With automatic fastening, the sanding sheet is in a changing station.
  • the sanding device lowers over the sanding sheet until the sanding plate lies firmly on it. Then the fastening tabs are raised and clamped between the pressure element and counter stop.
  • the fastening tabs When fastening in the middle area of the sanding sheet, the fastening tabs are raised by a hollow cylinder, which is most conveniently guided in the changing position.
  • the pressing element is actuated by the grinding device itself.
  • the pressing element also takes over the mounting tabs.
  • the hollow cylinder in the exchange station can be omitted here.
  • the pressure element is actuated from the grinder, always make sure that it is rotatable relative to it. This requires a certain amount of construction work.
  • the pressing element in the changing station is inserted into the grinding plate from below. By means of a snap connection or by magnetic forces or in some other way, the pressing element is then held on the counter stop during the clamping position.
  • an abrasive sheet 1 has fastening tabs 1 'in its central region (in the figure, only one of these tabs is provided with the reference number for all of them).
  • the fastening tabs 1 ' are formed by star-shaped slits.
  • a drive shaft 3 runs in the grinding device. It is rotatably mounted in the grinding device 2 via roller bearings 4. At its lower end, the drive shaft 3 has a component 5 which, together with a component 6, forms a wobble joint. The component 6 is in turn firmly connected to a grinding plate 7. To transmit the torque between the drive shaft 3 and the grinding plate 7, an axially extending guide groove 8 is provided in the component 5, into which a ball 9 held in the component 6 is inserted if.
  • the grinding plate 7 consists of a soft material and on its underside, that is, on the side. that points to the body surface to be machined later, a sanding sheet 1 corresponding to FIG. 1 is attached.
  • the chip setter 7 has a conical recess 10 in its central region, which widens towards the grinding surface.
  • the fastening tabs 1 'of the grinding wheel 1, which are flexible due to the design of the grinding sheet, are bent into the recess 10. There they are clamped between an actuatable pressing element 11 and a counter stop 12.
  • the counter stop 12 is rotatably held in the component 6 connected to the grinding plate 7 via a roller bearing 13.
  • the counter-stop 12 has a bearing surface for the fastening tabs 1.
  • the pressing element 11 can be actuated via a cable 14 from the grinding device 2.
  • the type of actuation is not shown in detail in FIG. 2, since it can be carried out in a wide variety of ways.
  • a pneumatic cylinder, the piston of which is connected to the cable 14, is suitable here, for example, in the upper region of the grinding device.
  • the pressing element 11 must be rotatable relative to the grinder 2.
  • the pressing element 11, which is designed as a cone piece, is pulled into the recess 10 by the cable 14 in the position shown in FIG. 2 and thereby presses the fastening tabs 1 'against the counter-stop 12.
  • the grinding device 2 When attaching the sanding sheet 1, the grinding device 2 lowers on the sanding sheet 1 lying in a device until the sanding plate 7 is fully seated on it. Then the pressing element 11 is moved downward, thereby piercing the flexible fastening tabs. Since the weight of the pressing element will be too low for this purpose, in addition to the cable 14, further actuating means are provided for this movement process in the grinding device. If the pressing element 11 has pierced the sanding sheet 1, the fastening tabs 1 'return to the starting position due to their flexibility. The cable 14 now pulls the pressing element 11 up again. The conical surfaces of the pressing element 11 take the fastening tabs 1 'with them and thereby bend them into the recess 10. The fastening tabs 1 'rest on the contact surface of the counter-stop 12 and are finally clamped between the pressing element 11 and the counter-stop 12 by further pulling on the cable 14.
  • FIGS. 3 to 7 show a different structure of the tensioning elements. However, if the parts are the same, they have the same reference numerals as in FIGS. 1 and 2.
  • an expanding mandrel 15 forms the pressing element.
  • the fastening tabs are pressed into the recess 10 by a stamp or hollow cylinder 16.
  • the stamp 16 is guided in a changing station which is independent of the grinding device 2.
  • the stamp 16 moving upward for attachment is shown in dashed lines.
  • the expanding mandrel 15 first moves downward and then radially outward until it presses the fastening tabs 1 ′ against the counter stop 12 with its conical outer lateral surface.
  • the expanding mandrel 15 itself is in turn rotatably mounted in the grinding device 2.
  • Fig. 4 shows an inflatable rubber band 17 as a pressing element.
  • the lifting tabs 1 ' are raised again by a hollow cylinder 16.
  • the rubber bellows 17 is inflated so that he clamps the mounting tabs 1 together with the counter-stop 12.
  • the rubber bellows itself can be rotated in relation to the grinder.
  • a conical disk 18 is arranged stationary with respect to the counter-stop 12.
  • the disc axis coincides with the axis of rotation of the grinding plate 7.
  • Another conical disk 19 is slidably provided over the conical disk 18 and is pressed onto the first disk by a compression spring 20.
  • the conical disks 18, 19 are arranged so that their conical outer surfaces converge, i.e. that is, the tapered disc sides face each other. This creates an annular V-cut when the discs touch.
  • An annular spring 21 is inserted into this V-cut.
  • the ring spring 21 is dimensioned such that it is widened when the two conical disks 18 and 19 touch. Since the spring 20 presses on the conical disk 19, this causes the spring 21 to expand, which then in turn presses the counter-stop 12 with the interposition of the fastening tabs 1 '.
  • a plunger 22 When attaching according to this embodiment, a plunger 22 first presses the upper conical disk 19 upward against the force of the spring 20.
  • the ring spring 21 can relax as shown in dashed lines in FIG. 5.
  • the hollow cylinder 16 can then bend the fastening tabs 1 ′ into the recess 10. If the plunger 22 now moves back, the spring 20, as already mentioned, presses over the conical disk 19 onto the ring spring 21, which widens and clamps the fastening tabs. Again, the parts forming the pressing element are rotatably held relative to the grinding device.
  • a cone piece 22, 23 which can be inserted from below is provided as the pressing element. They are actuated by a further hollow cylinder 24, which is also guided in a changing device (not shown further). 6, the cone piece 22 is held in its clamped position by a snap lock 25.
  • Such snap locks are generally known in the art, so that there is no need to go into them here.
  • either the counter stop 12 or the cone piece 23 is designed as a magnet, preferably as a permanent magnet.
  • the respective other clamping element is then made of a magnetically highly conductive material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP84105502A 1983-06-01 1984-05-15 Einrichtung zum Befestigen eines Schleifblattes an einem drehbaren Schleifteller eines Schleifgeräts Expired EP0127812B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3319925 1983-06-01
DE3319925A DE3319925C1 (de) 1983-06-01 1983-06-01 Spannvorichtung zum Halten eines Schleifblattes mit Befestigungslaschen an einem drehbaren Schleifteller

Publications (2)

Publication Number Publication Date
EP0127812A1 EP0127812A1 (de) 1984-12-12
EP0127812B1 true EP0127812B1 (de) 1987-05-06

Family

ID=6200470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105502A Expired EP0127812B1 (de) 1983-06-01 1984-05-15 Einrichtung zum Befestigen eines Schleifblattes an einem drehbaren Schleifteller eines Schleifgeräts

Country Status (4)

Country Link
US (1) US4622783A (enrdf_load_stackoverflow)
EP (1) EP0127812B1 (enrdf_load_stackoverflow)
JP (1) JPS59227367A (enrdf_load_stackoverflow)
DE (1) DE3319925C1 (enrdf_load_stackoverflow)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430856C2 (de) * 1984-08-22 1987-05-14 Bayerische Motoren Werke AG, 8000 München Anlage zum automatischen Schleifen von Flächen
JPH0715732Y2 (ja) * 1990-05-25 1995-04-12 ミネソタ マイニング アンド マニユフアクチユアリング カンパニー 研磨用ディスクホルダ組立体
US7004818B1 (en) 1990-08-17 2006-02-28 Haney Donald E Sander with orbiting platen and abrasive
US5081794A (en) * 1990-08-17 1992-01-21 Haney Donald E Sander with orbiting platen and abrasive
US5201785A (en) * 1991-05-10 1993-04-13 Minnesota Mining & Manufacturing Company Disc-holder assembly
US5927264A (en) * 1998-01-08 1999-07-27 Worley; Kenneth Extended wear stone polishing disk
DE19843266A1 (de) * 1998-09-21 2000-03-23 Martin Wiemann Gitterleinen-Schleifmaterial und Schleifverfahren
US6736712B1 (en) * 1999-05-07 2004-05-18 Performance Abrasives Incorporated Rotary sanding disk
US6485360B1 (en) * 1999-07-20 2002-11-26 Hutchins Mfg, Co. Orbital sanding tool
JP4586201B2 (ja) * 2001-02-09 2010-11-24 株式会社ウジケ 回転研磨機用研磨盤
US7198557B2 (en) 2001-08-02 2007-04-03 Haney Donald E Sanding machine incorporating multiple sanding motions
CA2622553A1 (en) * 2005-09-16 2007-03-22 Pasquale Catalfamo Abrasive body
US8323076B1 (en) 2009-06-16 2012-12-04 Bort Tracey A Backing plate for cut-off discs
USD808236S1 (en) * 2016-02-26 2018-01-23 Domaille Engineering, Llc Spring member of an optical fiber polishing fixture
JP7018724B2 (ja) * 2017-08-15 2022-02-14 株式会社ディスコ 切削ブレード及び切削ブレードの装着機構
JP6883137B1 (ja) * 2020-07-17 2021-06-09 エフイートレード株式会社 研磨用バフ
US12397391B2 (en) 2021-06-19 2025-08-26 Multiquip Inc. Grinding head assembly and driver interface
DE102022209838A1 (de) 2022-09-19 2024-03-21 Robert Bosch Gesellschaft mit beschränkter Haftung Befestigungsvorrichtung

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US871964A (en) * 1906-09-12 1907-11-26 Manufacturers Machine Co Buffing-machine and disk-holder therefor.
US2447102A (en) * 1946-12-03 1948-08-17 Alfred G Strand Sanding disk
US2454726A (en) * 1946-12-23 1948-11-23 Edwin H Tott Supporting head for abrasive disks
GB666035A (en) * 1948-08-24 1952-02-06 Robert Douglas Watson Improvements in or relating to rotary tools for grinding, sanding and polishing
US2501554A (en) * 1948-12-08 1950-03-21 James Shapiro Self-regulating drive for rotary abrasive tools
US2620605A (en) * 1950-11-22 1952-12-09 Black & Decker Mfg Co Mounting head for abrasive disks
US2719389A (en) * 1954-11-03 1955-10-04 Leslie K Singley Abrading disc or head
US2789402A (en) * 1955-06-14 1957-04-23 Berne Tocci Guilbert Back pad
US2764853A (en) * 1956-03-12 1956-10-02 Carm P Rhees Mounting head for grinding polishing, and featheredging tools
US2800752A (en) * 1956-04-11 1957-07-30 Black & Decker Mfg Co Sanding disk
GB871916A (en) * 1959-07-20 1961-07-05 Stanley Works Rotatable disc sander and the like
US3092937A (en) * 1961-03-30 1963-06-11 Tocci-Guilbert Berne Polishing and abrading apparatus
US3376675A (en) * 1965-05-17 1968-04-09 Alma A. Hutchins Quick-change rotary tool
IT1044620B (it) * 1975-09-04 1980-04-21 Urso Giuseppe D Utensile smerigliatore con foglio di tela o carta abrasiva amovibile con faccia e spigolo attivi relativo foglio di tela o carta abrasiva e procedimento per la produzione e l assemblaggio di tale utensile
GB2003770B (en) * 1978-09-12 1982-01-20 Marton Miksa Pad assembly for vacuum rotary sander
US4287685A (en) * 1978-12-08 1981-09-08 Miksa Marton Pad assembly for vacuum rotary sander

Also Published As

Publication number Publication date
EP0127812A1 (de) 1984-12-12
US4622783A (en) 1986-11-18
JPS649145B2 (enrdf_load_stackoverflow) 1989-02-16
DE3319925C1 (de) 1984-07-12
JPS59227367A (ja) 1984-12-20

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