EP0303954B1 - Schleifmaschine mit rotierendem Schleifteller - Google Patents

Schleifmaschine mit rotierendem Schleifteller Download PDF

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Publication number
EP0303954B1
EP0303954B1 EP88112980A EP88112980A EP0303954B1 EP 0303954 B1 EP0303954 B1 EP 0303954B1 EP 88112980 A EP88112980 A EP 88112980A EP 88112980 A EP88112980 A EP 88112980A EP 0303954 B1 EP0303954 B1 EP 0303954B1
Authority
EP
European Patent Office
Prior art keywords
grinding
sanding
central
plate
sheet
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
EP88112980A
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German (de)
English (en)
French (fr)
Other versions
EP0303954A1 (de
Inventor
Miksa Marton
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.)
Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT88112980T priority Critical patent/ATE63711T1/de
Publication of EP0303954A1 publication Critical patent/EP0303954A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • the invention relates to a grinding machine with a driven, rotating grinding plate, on the outside of which a grinding sheet is held on an abutment surface by means of an adhesive layer.
  • a secure attachment of the sanding sheet to the sanding plate can only be guaranteed with an adhesive layer if the sanding sheets are made of thin sandpaper.
  • the adhesive layer can either be on the back of the sanding paper or on the contact surface of the sanding plate, see for example DE-PS 28 20 370.
  • the sanding sheet Since the sanding sheets are subject to high wear and must be replaced frequently, the sanding sheet must be able to be detached from the sanding plate again while overcoming the adhesion of the adhesive.
  • the adhesive must therefore only have a limited adhesive capacity.
  • Such adhesives are not suitable for holding sanding sheets that are intended for heavier jobs and have a stronger backing, for example made of plastic-impregnated papers and fabrics and whose large mass would cause the abrasive sheet to shear and fly away even with low eccentricity.
  • the invention has for its object to provide a grinding machine of the type mentioned in such a way that the attachment and removal of sanding sheets of greater thickness is no problem and that at the very high speeds with which such grinding machines are operated, the required operational safety is guaranteed is.
  • the sanding sheet has a central hole and a central fastening element is arranged in the center of the sanding plate, which engages in a centering manner in the central hole of the sanding sheet.
  • the attachment of the sanding sheet to the sanding plate is thus achieved by two means, namely by the adherence of the adhesive layer and the centering effect of the central fastening element.
  • the central fastening element merely prevents the sanding sheet from being able to move in the radial direction with respect to the sanding plate, while the adhesive layer essentially has the task of preventing the sanding sheet from rotating relative to the sanding plate. Since the sanding sheet is pressed against the sanding plate by the reaction force exerted by the workpiece during sanding, the adhesive layer does not need to have a high level of adhesion to ensure that the sanding sheet is carried along perfectly.
  • the frictional engagement between the sanding plate and the sanding sheet need only be somewhat greater than the tangential force exerted on the sanding sheet during sanding. There is also a take off under these conditions not to fear the sanding sheet from the sanding plate.
  • the central fastening element can therefore only be a pin projecting beyond the contact surface of the sanding plate, the length of which is at most equal to the thickness of the sanding sheet lying against the sanding plate, so that it does not project beyond the surface of the sanding sheet and thus does not hinder the grinding process. Rather, this embodiment of the invention allows a completely flat contact of the grinding plate with the workpiece, as is typical for finishing work. Since it is only the centering effect of the central fastening element that is important in the grinding machine according to the invention, it does not need to have a head that engages over the grinding sheet at the edge of its central hole.
  • this embodiment of the invention is particularly easy to handle, since the sanding sheet only has to be placed on the sanding plate like a record and can also be removed in the same way.
  • the adhesive used does not provide any resistance to the lifting of the sanding sheet from the sanding plate.
  • the invention can also be used for grinding sheets which are not so thick that they would find sufficient hold on a pin which only protrudes over the contact surface of the grinding plate.
  • the central fastening element can be designed as a screw which has a head and is screwed into a central threaded bore of the grinding plate, and the grinding plate can have a recess which receives the head.
  • the head is not responsible for the sanding sheet to clamp between the head of the fastening element and the outside of the sanding plate, but the head only needs to prevent the sanding sheet from slipping off the central fastening element, so that the centering effect of this fastening element is always guaranteed.
  • the head can therefore be kept very small so that it does not cause any significant deformation of the grinding plate.
  • the screw does not need to be tightened either. Rather, a preferred embodiment of the invention provides that the depth of penetration of the screw into the central threaded bore is limited by a stop by which the head of the screw is held at a distance from the surface of the recess in the grinding plate, so that there is no risk that if the screw of the sanding sheet is tightened carelessly in the area of its center, it is damaged and damaged.
  • the central fastener is resiliently locked in a central recess of the grinding plate.
  • a resilient latching can be designed in a simple manner according to the push-button or snap principle, so that the frictional force exerted by the resilient latching elements is sufficient to hold the central fastening element securely under the low axial forces that occur during operation.
  • the central fastening element can be designed such that a positive locking takes place, which can then only be released using a special tool.
  • Such training has the advantage that the spring forces exerted by the latching elements can be much lower than in the case of a push-button-type latching, which facilitates the insertion and loosening of the fastening element, in which case the tool required for loosening could also facilitate the handling of the fastening element.
  • the central fastening element can be designed as a sleeve, the wall of which has at least one recess in which a locking element is mounted, which in its locking position resiliently engages behind a corresponding shoulder arranged in the central recess of the grinding plate and through one from the outside into the sleeve insertable mandrel is deflectable from its rest position.
  • Adhesives that meet the requirements discussed above can be found among the myriad of adhesives available on the market today. Preference is given to a permanently elastic synthetic resin adhesive which does not lose its adhesive properties in manageable periods of time and is set such that it neither adheres firmly to the surface of other bodies with which it comes into contact, nor does it leave any traces. In particular, the adhesive should be set so that it does not have to be covered with a protective film until the abrasive sheet is put into use.
  • the abrasive sheets provided with the adhesive layer should be stackable in such a way that the abrasive sheets each lie with the adhesive layer on the abrasive layer of the underlying abrasive sheet without the abrasive sheets sticking to each other in any significant way or when the abrasive sheets are separated, the adhesive layer of the upper abrasive sheet adheres to the abrasive layer of the sanding sheet underneath gets stuck.
  • An adhesive that meets all of these requirements consists of a correspondingly set vinyl acetate-acrylate copolymer resin.
  • a particular advantage of this adhesive is that it can be processed in the form of an aqueous emulsion and therefore no toxic solvents have to be used. There are also no known incompatibilities with the adhesive itself.
  • An adhesive which is available under the name "Swift's 16433 Pressure Sensitive Adhesive" is particularly preferred. This adhesive is manufactured and sold by Swift Adhesive at 383 Orenda Road, Bramalea, Ontario L6T 1G4, Canada.
  • the grinding machine shown in FIG. 1 has a grinding plate 10 into which the end of a pin 12 provided with a thread 11 is embedded.
  • the thread 11 is screwed into the end of a motor shaft 14 and thereby connected to this motor shaft.
  • the motor shaft 14 does not belong to one Drive motor shown in more detail, with which the grinding plate 10 can be set in rotating motion.
  • This motor which can be, for example, an electric motor or a pneumatic motor, is arranged in a housing 16, the section of which is shown in FIG. 1 and ends at a distance from the rear of the grinding plate 10.
  • the backing plate 10 is provided on its rear side with a cover 18, which is connected to the backing plate 10 by spacers 20 and also has an apron 22 extending over the edge of the backing plate on its circumference.
  • An elastic connecting piece 24 is placed on the lower section of the housing 16 and rests with its end on the side of the cover 18 facing the housing, so that the housing is connected to the back of this cover essentially airtight.
  • the connecting piece 24 has a lateral pipe socket 26 for connecting a suction device. This arrangement enables the suction of grinding dust along the circumference of the grinding plate 10.
  • the drive for the grinding plate can also be designed such that the grinding wheel carries out a translational movement along a circular path instead of a rotating movement (orbital grinding machine).
  • the side of the sanding plate 10 facing away from the housing 16 forms a contact surface for a sanding sheet 30, the side of which facing away from the sanding plate 10 is covered in the usual manner with an abrasive layer, not shown.
  • the sanding sheet itself can consist of different materials, for example of thin, flexible paper, but also of plastic-impregnated paper and other fiber layers, including textile fiber layers. These plastic or resin impregnated fiber layers can be significant Have thickness and rigidity.
  • the embodiment of the invention shown in Fig. 1 enables the attachment of sanding sheets that have a certain thickness and rigidity. In the embodiment shown in FIG.
  • a pin 32 which is formed by an extension of the pin 12 carrying the sanding plate 10, is used to fasten such a relatively thick and rigid sanding sheet 30, protrudes a short distance over the contact surface 34 of the sanding plate 10 and engages in a central bore 36 of the sanding sheet 30.
  • This bore 36 has essentially the same diameter as the pin 32, so that the sanding sheet 30 is held by the pin 32 centrally to the grinding plate.
  • the protrusion of the pin 32 over the contact surface 34 of the grinding plate 10 is somewhat less than the thickness of the sanding sheet 30, so that the pin 32 does not protrude beyond the outside of the sanding sheet.
  • the sanding sheet has on its side facing the sanding plate an adhesive layer 38, which causes the sanding sheet 30 to adhere to the outside of the sanding plate 10.
  • the adhesive layer 38 consists of a vinyl acetate-acrylate copolymer synthetic resin adhesive commercially available under the name "Swift's 16433 Pressure Sensitive Adhesive", which is manufactured and sold by the Swift Adhesives company in Bramalea, Canada.
  • This adhesive pre-forms in the form of an aqueous emulsion, so that it is free of toxic additives which could otherwise become free under the loads which occur during grinding.
  • the adhesive power of this adhesive is not sufficient to enable the sanding sheet to be attached to the sanding plate alone. Rather, the sanding sheet provided with the adhesive can be easily lifted off the sanding plate at any time without that adhesive residue remains on the sanding plate.
  • the adhesiveness of the adhesive layer is sufficient to ensure that the sanding sheet 30 held by the central pin 32 centrally to the sanding plate 10 follows the movement of the sanding plate, because the forces which occur during sanding and are directed parallel to the outside of the sanding plate are very much less than the frictional engagement that is produced by the adhesive layer of the sanding sheet lying on the outside of the sanding plate.
  • FIG. 1 The embodiment of the invention shown in FIG. 1 is of course only suitable for those sanding sheets that are thick enough to find a perfect contact with a pin whose section protruding from the sanding plate must not be longer than the sanding sheet. With very thin sanding sheets, this requirement is no longer met.
  • FIGS. 2 and 3 are suitable for the use of such sanding sheets, in which the central fastening element, which serves to center the sanding sheet, has a head which overlaps the edge delimiting the central hole of the sanding sheet.
  • the central fastening means is a screw 42 provided with a countersunk head 40, the shaft of which has a cylindrical section 44 adjoining the countersunk head 40.
  • This screw 42 is screwed into a central bore 46 of the pin 48 used to connect the motor shaft of the grinding machine.
  • this bore 46 has a smooth cylindrical section, which is then followed by a threaded section of smaller diameter, so that a shoulder 50 is present at the transition between these two sections, on which the screw 42 with the end of its cylindrical section 44 strikes.
  • the grinding plate 52 fastened on the motor shaft 48 has a conical recess 54 in the area of its center, which receives the countersunk head 40 of the screw 42.
  • the depth of penetration of the screw 42 into the bore 46 of the motor shaft 48 is limited by the shoulder 50 in such a way that the countersunk head 40 does not touch the surface of the recess 54, but a distance remains between the countersunk head 40 and the surface of the recess 54 Width is substantially equal to the thickness of the sanding sheet 56 to be attached to the sanding plate 52.
  • the grinding sheet 56 is so flexible that its portion surrounding the central hole 58 can be pressed into the recess 54 of the grinding plate 52 by the countersunk head 40 of the screw.
  • FIG. 3 differs from the embodiment according to FIG. 2 in that, instead of a screw, a central fastening element 60 is used, which is located in a central recess of the grinding plate, namely a bore 62 in that for fastening the grinding plate 64 on the motor shaft serving pin 66 is resiliently locked.
  • the fastening element 60 is designed as a sleeve, which is expanded conically at its outer end, so that it forms a type of countersunk head 68, while at its inner end it has recesses 70 formed by axial slots, in which lever-like latching elements 72 about axes 74 are pivotally mounted, which penetrate the recesses 70 transversely in the circumferential direction of the sleeve.
  • the latching elements 72 protrude beyond the inner end of the sleeve 60 and are surrounded there by a spring ring 76 which tends to press these ends of the latching elements radially inwards, so that the ends of the locking elements 72 facing the outer end of the sleeve 60, as shown in FIG. 3, come out of the sleeve 60 and engage behind a shoulder 78 in the bore 62.
  • the sleeve 60 is securely latched in the bore 62 and in turn engages with its countersunk head 78 an abrasive sheet 80 which bears against the outside of the grinding plate 64 and whose central hole 82 is penetrated by the sleeve 60.
  • the grinding plate 64 in turn has a central recess 84 which receives the countersunk head 68 of the sleeve 60 and the central section 86 of the grinding sheet 80 which is gripped by this countersunk head.
  • the countersunk head 68 merely prevents the sanding sheet 80 from sliding off the central fastening element, but does not exert a force that clamps the sanding sheet 80 on the central section 86 of the sanding sheet.
  • the sanding sheet 80 is provided on its contact surface facing the sanding plate 64 with an adhesive layer 88, which ensures that the sanding sheet 80 is carried along with the rotational movement of the sanding plate 64.
  • the fastening element 60 can simply be pressed into the bore 62 of the grinding plate 64 to such an extent that the locking elements 72 deflected from the wall of the bore snap behind the shoulder 78.
  • the locking elements 72 are designed so that their inner ends, which are loaded by the spring ring 78, project into the bore 90 of the sleeve 60, so that they can be inserted with the aid of a simple mandrel 92, which can be inserted into the bore 90 of the sleeve 60 from the outside 3 can be deflected.
  • the force of the spring ring 76 can be dimensioned such that the frictional engagement between the ends of the latching elements which abut under its force on the circumference of the mandrel 92 and the mandrel is sufficient to bring the sleeve 60 with its catch elements 72 when the mandrel 92 is pulled out of the bore 62 of the grinding plate 52 again.
  • the handling of a grinding machine designed according to FIG. 3 is considerably simplified.
  • the invention is not limited to the exemplary embodiments shown.
  • the design of the grinding machine as such is not important for the application of the invention.
  • the invention can be used in grinding machines in which the grinding plate executes a rotating or a translatory movement.
  • the invention is therefore also particularly suitable for grinding machines which can be switched from one type of movement to the other.
  • central screws could also be used without a stop shoulder or locking elements which, like push buttons, can also be pulled out of the corresponding recess while overcoming the resilient locking.
  • the central fastening element can have any cross section and head shapes other than a countersunk head are also conceivable. Accordingly, there are many possibilities available to the person skilled in the art to implement the invention in a different way than the exemplary embodiments show, in which, however, the invention is implemented in a particularly advantageous manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Grinding (AREA)
  • Pretreatment Of Seeds And Plants (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)
EP88112980A 1987-08-20 1988-08-10 Schleifmaschine mit rotierendem Schleifteller Expired - Lifetime EP0303954B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88112980T ATE63711T1 (de) 1987-08-20 1988-08-10 Schleifmaschine mit rotierendem schleifteller.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8711311U DE8711311U1 (de) 1987-08-20 1987-08-20 Schleifmaschine mit rotierendem Schleifteller
DE8711311U 1987-08-20

Publications (2)

Publication Number Publication Date
EP0303954A1 EP0303954A1 (de) 1989-02-22
EP0303954B1 true EP0303954B1 (de) 1991-05-22

Family

ID=6811244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112980A Expired - Lifetime EP0303954B1 (de) 1987-08-20 1988-08-10 Schleifmaschine mit rotierendem Schleifteller

Country Status (12)

Country Link
EP (1) EP0303954B1 (ko)
JP (1) JPH01135480A (ko)
AT (1) ATE63711T1 (ko)
AU (1) AU605620B2 (ko)
BR (1) BR8804228A (ko)
DD (1) DD282193A5 (ko)
DE (2) DE8711311U1 (ko)
DK (1) DK466188A (ko)
ES (1) ES2022552B3 (ko)
GR (1) GR3002602T3 (ko)
NO (1) NO883718L (ko)
SU (1) SU1716960A3 (ko)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824387A1 (de) * 1998-05-30 1999-12-02 Fein C & E Kraftgetriebenes Handwerkzeug
RU2736767C2 (ru) * 2016-08-22 2020-11-19 Роберт Бош Гмбх Быстрозажимное устройство для переносной технологической машины, в частности для угловой шлифовальной машины
DE102017214118A1 (de) * 2017-08-11 2019-02-14 Robert Bosch Gmbh Schnellspannvorrichtung für eine, insbesondere zumindest eine rotierend antreibbare Abtriebswelle aufweisende, tragbare Werkzeugmaschine, insbesondere Winkelschleifmaschine
DE102021121566A1 (de) 2021-08-19 2023-02-23 Festool Gmbh Tellerwerkzeug

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE652171C (de) * 1937-10-26 Robert Bosch Akt Ges Schleifteller mit elastischer Unterlage fuer das Schleifblatt
US1353966A (en) * 1919-10-29 1920-09-28 William A Lorenz Suction-head for disk grinding-machines
US1506078A (en) * 1922-07-22 1924-08-26 George A Parks Dental polishing disk
US2349365A (en) * 1936-07-09 1944-05-23 Carborundum Co Flexible abrasive article
US2279673A (en) * 1940-05-25 1942-04-14 Delmar E Meyer Grinding disk
US2729038A (en) * 1953-10-30 1956-01-03 Alma A Hutchins Rotary abrading machine heads
GB753938A (en) * 1954-06-18 1956-08-01 Berne Tocci Guilbert Improvements in or relating to polishing and abrading apparatus
US2789402A (en) * 1955-06-14 1957-04-23 Berne Tocci Guilbert Back pad
US2800751A (en) * 1956-04-04 1957-07-30 Black & Decker Mfg Co Feather edger
US2800752A (en) * 1956-04-11 1957-07-30 Black & Decker Mfg Co Sanding disk
DE1189405B (de) * 1961-08-07 1965-03-18 Lutz Kg Eugen Staubabsaugvorrichtung fuer Tellerhandschleifmaschinen, insbesondere Falzschleifmaschinen
DE1502526C3 (de) * 1965-07-17 1978-04-13 Merit Products Inc., Los Angeles, Calif. (V.St.A.) Schleifscheibenbefestigung
US3436875A (en) * 1966-08-05 1969-04-08 Ralph R Cheney Abrasive disc holder
FR2365411A1 (fr) * 1976-09-27 1978-04-21 Robert Jean Ponceuse a disque de papier abrasif monte sur un plateau circulaire tournant
CA1078620A (en) * 1978-05-05 1980-06-03 Miksa Marton Stick-on sanding disc

Also Published As

Publication number Publication date
GR3002602T3 (en) 1993-01-25
BR8804228A (pt) 1989-03-14
NO883718D0 (no) 1988-08-19
DD282193A5 (de) 1990-09-05
DK466188D0 (da) 1988-08-19
JPH01135480A (ja) 1989-05-29
ATE63711T1 (de) 1991-06-15
NO883718L (no) 1989-02-21
SU1716960A3 (ru) 1992-02-28
DK466188A (da) 1989-02-21
DE3862908D1 (de) 1991-06-27
ES2022552B3 (es) 1991-12-01
AU2112188A (en) 1989-02-23
AU605620B2 (en) 1991-01-17
DE8711311U1 (de) 1987-10-08
EP0303954A1 (de) 1989-02-22

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