EP2151302B1 - Disque pour supporter un matériau abrasif, pour outils électriques - Google Patents

Disque pour supporter un matériau abrasif, pour outils électriques Download PDF

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Publication number
EP2151302B1
EP2151302B1 EP09165152A EP09165152A EP2151302B1 EP 2151302 B1 EP2151302 B1 EP 2151302B1 EP 09165152 A EP09165152 A EP 09165152A EP 09165152 A EP09165152 A EP 09165152A EP 2151302 B1 EP2151302 B1 EP 2151302B1
Authority
EP
European Patent Office
Prior art keywords
disc
cup
shaped portion
abrasive material
annular portion
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.)
Active
Application number
EP09165152A
Other languages
German (de)
English (en)
Other versions
EP2151302A1 (fr
Inventor
Matteo Losi
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.)
BDL Srl
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BDL Srl
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Publication date
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Application filed by BDL Srl filed Critical BDL Srl
Priority to SI200930041T priority Critical patent/SI2151302T1/sl
Publication of EP2151302A1 publication Critical patent/EP2151302A1/fr
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Publication of EP2151302B1 publication Critical patent/EP2151302B1/fr
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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
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/18—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor with cooling provisions

Definitions

  • the invention relates to a disc for electric tools, for supporting abrasive material.
  • discs are usually employed in industry or in the do-it-yourself field in combination with electric tools such as drills, sanders, millers and the like, to perform abrasive actions on surfaces.
  • abrasive discs for electric tools comprise an annular surface destined to engagedly receive abrasive material, such as for example sandpaper of any grain.
  • abrasive material used is given by little blades arranged partially superposed on one another, such that each blade exhibits a free edge which is substantially aligned with an ideal radius developing from the centre of the disc and going up to the edge thereof.
  • the blades are stably constrained to the discs by an adhesive material, for example a layer of resin, or are inserted and constrained in channels afforded on the annular portion of the disc.
  • a cup-shaped portion develops internally of the annular portion of the disc which is destined to receive the abrasive material, which cup-shaped portion exhibits a hole at a central position of the disc.
  • the shaft of the electric tool chuck is inserted in the hole, to constrain the disc to the tool.
  • the chuck shaft is usually conformed such that it exhibits a change in section which defines an abutment having greater dimensions than the hole in the disc.
  • the disc is rested on the abutment and the portion of shaft passing through the hole of the disc is engaged by a locknut; thus the disc is coupled to the electric tool.
  • the cup-shaped portion of the disc is necessary to ensure that the locknut does not extend (for obvious reasons) beyond the active surface of the disc, i.e. it does not extend beyond the abrasive surface defined by the abrasive material.
  • the cup-shaped portion is conformed such as to present the concavity thereof (the inside of the cup) arranged on the same side as the surface of the annular portion destined to engage with the abrasive material.
  • a ring-shaped abrasive disc has a series of tabs around the disc which are used to secure it to a backing plate.
  • the disc includes slots arranged around its periphery for receiving the tabs.
  • the backing plate may also include an impeller to blow air over the abrasive disc to provide cooling or remove swarf from the work surface.
  • the powder collected in the cup-shaped portion is expelled therefrom in a radial direction towards the external periphery of the disc.
  • the technical aim underpinning the present invention is to provide a disc for electric tools, for the supporting of abrasive material, which obviates the drawbacks in the above-mentioned prior art.
  • an aim of the present invention is to provide a disc for electric tools for supporting abrasive material which is able to guarantee an ideal functioning condition of the abrasive material.
  • 1 denotes in its entirety a disc for electric tools for supporting abrasive material, according to the present invention.
  • the disc 1 comprises an annular portion 2 destined to engagingly receive abrasive material (not illustrated).
  • the annular portion 2 comprises a first surface 3 and a second surface 4 opposite the first surface 3.
  • Both the surfaces 3, 4 are substantially flat and have an annular development.
  • the abrasive material is constrained to the first surface 3, preferably with the aid of an adhesive material, for example a resin.
  • the first surface 3 of the annular portion comprises a plurality of circular recesses 5 which are reciprocally concentric in order to facilitate the constraining of the abrasive material to the disc 1.
  • abrasive material which can be constrained to the annular portion 2 can be of any kind.
  • abrasive material of a sheet-form or flat-form is constrained to the annular portion 2, such that each sheet superposes an adjacent one, creating a crown of abrasive material superposed on the annular portion 2.
  • the disc 1 further comprises a cup-shaped portion 6 (illustrated in figure 1 and also visible in figure 4 ) which develops internally of the annular portion 2.
  • the cup-shaped portion 6 comprises a bottom wall 7 and a lateral wall 8 which connects the bottom wall 7 and the annular portion 2.
  • the bottom wall 7 has a substantially flat development and develops substantially parallel to the annular portion 2, as illustrated clearly in figure 4 .
  • the lateral wall 8 develops between the bottom wall 7 and the annular portion 2 and has a substantially truncoconical development, as illustrated in the figures.
  • the cup-shaped portion 6 has the concavity thereof facing towards the annular portion 2.
  • the bottom wall 7 of the cup-shaped portion 6 comprises a central hole 9 for passage of a shaft of a chuck of an electric tool, which engages the disc 1 to the electric tool.
  • the cup-shaped portion 6 comprises a plurality of openings 10 arranged on the lateral wall 8, as illustrated in the accompanying figures of the drawings.
  • the dust i.e. the particles of abraded material produced during the use of the disc 1
  • the periphery of the cup-shaped portion 6 i.e. towards the lateral wall 8 thereof
  • the openings 10 preventing the dust from striking the abrasive material located on the annular portion 2 and clogging it to reduce its efficiency.
  • the openings 10 extend from the bottom wall 7 up to reaching the annular portion 2, in particular the second surface 4 thereof, such that the openings develop over the whole height of the cup-shaped portion 6 and ensure excellent disposal of the dust contained in the cup-shaped portion 6.
  • the height of the cup is the distance between the bottom wall 7 and a plane passing through the annular portion 2, in particular the first surface 3 of the annular portion, measured on a straight line which is perpendicular to the bottom wall 7.
  • the openings 10 are identical to one another in dimensions and shape and are reciprocally equidistanced.
  • the dust is in this way expelled from the cup-shaped portion 6 uniformly, i.e. not depending on the relative position of the dust inside the cup-shaped portion 6.
  • the disc 1 comprises a plurality of walls 11 (see figures 1 and 2 ) which develop between the hole 9 and the lateral wall 7 of the cup-shaped portion 7.
  • Each wall 11 physically separates an opening 10 from an adjacent opening 10.
  • two adjacent walls 11 define, in combination with an opening 10 in the lateral wall 7 of the cup-shaped portion 6, a discharge channel 12, i.e. a space delimited by three walls and open at an end thereof.
  • the function of the walls 11 and therefore the discharge channels 12 is to direct the dust which accumulates in the cup-shaped portion 6 towards the openings 10, preventing the dust from freely circulating internally of the cup-shaped portion 6 before being discharged through the openings 10.
  • the walls 11 further increase the ability to discharge dust accumulated internally of the cup-shaped portion 6.
  • Each discharge channel 12 preferably exhibits transversal sections which progressively increase in size going from the hole 9 towards the lateral wall 8 of the cup 6.
  • transversal sections of the discharge channels are meant the sections of the discharge channels along a perpendicular plane to the bottom wall 7 of the cup-shaped portion 6.
  • each discharge channel 12 preferably have a spiral-portion development, such that each wall 11 behaves like a blade of an impeller of a centrifugal ventilator.
  • the flow of dust being deviated as described above, therefore strikes the openings 10 in the side wall 8 of the cup-shaped portion 6 and exits from the disc 1 without striking the first surface 3 (the surface which constrainingly receives the abrasive material) of the annular portion 2.
  • the cup-shaped portion 6 further comprises a cylindrical element 13 emerging from the bottom wall 7.
  • the hole 9 is afforded in the cylindrical element 13 and is threaded.
  • the chuck shaft screws directly into the threaded hole 9, constraining the disc 1 to the electric tool.
  • the threading of the hole 9 is such that during rotation of the disc 1 the forces acting on the disc 1 tend to rotate the disc 1 with respect to the chuck shaft in the screwing direction of the disc on the chuck shaft. This characteristic ensures that during use the disc cannot loosen and free itself from the tool.
  • the cylindrical element 13 exhibits a height which is substantially identical to the height of the lateral wall 8 of the cup-shaped portion 6, such that the cylindrical element 13 is abreast of the annular portion 2.
  • the height of the cylindrical element is measured in the same way as described above, to define the height of the cup-shaped portion 6.
  • the walls 11 are connected to an external surface of the cylindrical element, such that each discharge channel 12 is separated from the adjacent one.
  • each wall 11 is of a height (measured as above-indicated in relation to the height of the cup-shaped portion 6) which is substantially identical to that of the cylindrical element 13 and the cup-shaped portion 6.
  • the hole 9 enables a self-locking coupling between the disc and the tool.
  • a plurality of retaining teeth 14 are fashioned from the cylindrical portion 13, which teeth 14 are destined to retain a washer (not illustrated) for demounting the disc from the electric tool.
  • the washer is screwed on the shaft of the chuck and is lodged in the retaining teeth 14, thus being solidly constrained to the disc 1.
  • the retaining teeth 14 are four in number and are equidistanced.
  • the lower part of the cup-shaped portion 6, i.e. the part facing the opposite direction with respect to the concavity which houses the walls 11, comprises an annular undercut 15 which develops about the hole 9.
  • This undercut 15 has the function of self-centring the disc 1 on the chuck shaft.
  • the invention as described achieves the set aims.
  • the openings 10 enable the dust collected in the cup-shaped portion 6 to be discharged without striking the surface of the annular portion 2 destined to receive the abrasive material.
  • the walls 11 increase the efficiency of the dust discharge.
  • the presence of the walls 11 increases the mechanical properties of the abrasive tool 1, giving it greater rigidity with respect to traditional tools in the prior art.

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

Claims (7)

  1. Disque pour supporter un matériau abrasif, pour outils électriques comprenant:
    une section annulaire (2) destinée à recevoir et à contenir un matériau abrasif;
    une section en forme de tasse (6) qui se développe à l'intérieur de la section annulaire (2) et comprend une paroi de fond (7) avec un orifice central (9) pour faire passer un axe d'un mandrin d'un outil électrique, et une paroi latérale (8) raccordant la paroi de fond (7) et la section annulaire (2) ;
    la section en forme de tasse (6) comprenant une pluralité d'ouvertures (10) situées sur la paroi latérale (8) ;
    caractérisé en ce qu'un élément cylindrique (13) dépasse de la paroi de fond (7) ; l'orifice (9) étant réalisé dans l'élément cylindrique (13) et étant fileté ; caractérisé en ce que:
    lesdites ouvertures (10) vont de la paroi de fond (7) à la section annulaire (2) ;
    il comprend une pluralité de parois (11) qui se développent entre une paroi extérieure de l'élément cylindrique (13) et la paroi latérale (8) de la section en forme de tasse (6), chaque paroi (11) de la pluralité des parois (11) séparant une ouverture (10) d'une ouverture adjacente (10), chaque paroi (11) présentant une hauteur pratiquement égale à celle de l'élément cylindrique (13) ; et en ce que deux parois adjacentes (11) déterminent un canal d'évacuation (12), conjointement avec l'ouverture (10) de la paroi latérale (8) de la section en forme de tasse (6).
  2. Disque selon la revendication 1, dans lequel chaque canal d'évacuation (12) présente des parties transversales ayant des dimensions croissantes dans une direction allant de l'orifice à la paroi latérale (8) de la section en forme de tasse (6).
  3. Disque selon les revendications 1 ou 2, dans lequel les parois (11) déterminant chaque canal d'évacuation (12), ont un développement en section de spirale de sorte à réaliser une pluralité de déviateurs de flux.
  4. Disque selon la revendication 1, dans lequel les ouvertures (10) sont identiques et équidistantes.
  5. Disque selon la revendication 1, dans lequel l'élément cylindrique (13) présente une hauteur qui est pratiquement égale à la hauteur de la paroi latérale (8) de la section en forme de tasse (6), de sorte que l'élément cylindrique (13) est de niveau avec la section annulaire (6).
  6. Disque selon la revendication 1, comprenant une pluralité de dents de retenue (14) dépassant de l'élément cylindrique (13) destinées à retenir une rondelle pour démonter le disque de l'outil électrique.
  7. Outil abrasif, comprenant un disque selon l'une des revendications 1 à 6, et un matériau abrasif appliqué sur une section annulaire du disque.
EP09165152A 2008-08-05 2009-07-10 Disque pour supporter un matériau abrasif, pour outils électriques Active EP2151302B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200930041T SI2151302T1 (sl) 2008-08-05 2009-07-10 Kolut za držanje abrazivnega materiala za električna orodja

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRE2008A000075A IT1391160B1 (it) 2008-08-05 2008-08-05 Disco per elettroutensili per il supporto di materiale abrasivo.

Publications (2)

Publication Number Publication Date
EP2151302A1 EP2151302A1 (fr) 2010-02-10
EP2151302B1 true EP2151302B1 (fr) 2011-06-08

Family

ID=40548821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09165152A Active EP2151302B1 (fr) 2008-08-05 2009-07-10 Disque pour supporter un matériau abrasif, pour outils électriques

Country Status (6)

Country Link
EP (1) EP2151302B1 (fr)
AT (1) ATE511952T1 (fr)
ES (1) ES2365302T3 (fr)
IT (1) IT1391160B1 (fr)
PT (1) PT2151302E (fr)
SI (1) SI2151302T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012100088U1 (de) 2012-01-11 2012-02-27 Jobra Gmbh Trägerplatte für Lamellenschleifscheiben

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1404215B1 (it) * 2011-01-25 2013-11-15 Campana Mirco E Figli S N C Disco per elettroutensili, di supporto di materiale abrasivo
US20150283675A1 (en) * 2014-04-04 2015-10-08 Campana Mirco E Figli S.N.C. Disc for power tools for supporting abrasive material and abrasive disc comprising said support
IT201600117892A1 (it) * 2016-11-22 2018-05-22 Bdl S R L Disco per elettroutensili per il supporto di materiale abrasivo e metodo di realizzazione di un disco abrasivo comprendente detto disco di supporto
CN110722438B (zh) * 2019-09-12 2020-10-16 重庆市三叶家具有限责任公司 一种钢木家具加工用打磨抛光设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU7941898A (en) * 1997-05-28 1998-12-30 Adrian Bogalo An improved abrasive disc and backing plate therefor
US6599180B2 (en) 2001-04-05 2003-07-29 Asahi Seiko Usa Inc. Anti-theft coin monitoring sensor unit for a coin hopper dispenser
DE102004009443A1 (de) * 2004-02-27 2005-09-15 August Rüggeberg Gmbh & Co. Kg Werkzeug zur spanabhebenden Bearbeitung
EP1741515B1 (fr) * 2005-07-05 2007-11-07 August Rüggeberg GmbH & Co. KG Outil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012100088U1 (de) 2012-01-11 2012-02-27 Jobra Gmbh Trägerplatte für Lamellenschleifscheiben
WO2013104737A1 (fr) 2012-01-11 2013-07-18 Jobra Metall Gmbh Plaque de support pour meules à lamelles

Also Published As

Publication number Publication date
SI2151302T1 (sl) 2011-08-31
ATE511952T1 (de) 2011-06-15
ES2365302T3 (es) 2011-09-28
IT1391160B1 (it) 2011-11-18
ITRE20080075A1 (it) 2010-02-06
PT2151302E (pt) 2011-07-12
EP2151302A1 (fr) 2010-02-10

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