EP0542693A1 - Abrasive disc for lapping machines with improved locking means - Google Patents

Abrasive disc for lapping machines with improved locking means Download PDF

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Publication number
EP0542693A1
EP0542693A1 EP92830046A EP92830046A EP0542693A1 EP 0542693 A1 EP0542693 A1 EP 0542693A1 EP 92830046 A EP92830046 A EP 92830046A EP 92830046 A EP92830046 A EP 92830046A EP 0542693 A1 EP0542693 A1 EP 0542693A1
Authority
EP
European Patent Office
Prior art keywords
disc
abrasive disc
abrasive
lapping machine
lapping
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.)
Withdrawn
Application number
EP92830046A
Other languages
German (de)
English (en)
French (fr)
Inventor
Fabrizio c/o TAF S.r.l. Cortese
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.)
TAF Srl
Original Assignee
TAF Srl
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 TAF Srl filed Critical TAF Srl
Publication of EP0542693A1 publication Critical patent/EP0542693A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/16—Bushings; Mountings

Definitions

  • the present invention relates to an abrasive disc for lapping machines with improved locking means.
  • the abrasive or abrading discs used in lapping machines usually comprise a disc body which has, on a face thereof, an annular portion made of an abrasive material, and a tapering central hole opening toward the outer portion of the disc.
  • a spacer member is preliminarily arranged about a driving pin or stud of the machine, and then the abrasive disc is clamped by threading on the threaded stud a ring-nut having a frustum of cone shaped outer surface provided for engaging with the frustum of cone shaped tapering portion of the abrasive disc.
  • the ring-nut must comprise axial notches in order to allow a suitable tool to be used for threading and unthreading said ring-nut.
  • This locking arrangement for engaging the abrasive disc on the lapping machine is affected by drawbacks, mainly because the clamping region of the disc is practically delimited by the frustum of cone shaped region which is axially clamped and requires, both for engaging and disengaging the abrasive disc, that a suitable tool be used.
  • the aim of the present invention is to improve the locking arrangement for locking and disengaging abrasive discs in lapping machine, so as to make the engagement and disengagement operations of the abrasive disc quicker and safer.
  • a main object of the present invention is to provide such a locking arrangement which allows the abrasive disc to be coupled to the coupling stud of a lapping machine in a very firm way so as to safely prevent the abrasive disc from disengaging from the lapping machine.
  • Yet another object of the present invention is to provide such an abrasive disc for lapping machines, which can be easily made starting from easily available elements and materials and which, moreover, is very competitive from a mere economic standpoint.
  • an abrasive disc for lapping machines including improved locking means, and comprising a disc body having a central hole and supporting, on a face thereof, an abrasive material annular region, characterized in that it is moreover provided, at said hole, with at least a threaded portion for engaging with the threaded abrasive disc coupling end piece of a lapping machine, in order to firmly lock said abrasive disc on said lapping machine.
  • the abrasive disc for lapping machines comprising a disc body 2, made of a plastic material, preferably of the nylon, glass fibre reinforced nylon, polycarbonate or the like type.
  • the disc body includes, at the central portion thereof, a throughgoing hole and, on a face thereof, an abrasive region 5 which, advantageously, though not necessarily, is of a multiple layer type, including a plurality of layers superimposed onto one another in a fan configuration.
  • the main feature of the invention is that, at said central hole, there is provided a thread 10, adapted to engage with the disc engaging threaded stud 11 of the lapping machine 12.
  • the mentioned thread has a direction opposite to the working direction, thereby the coupling of the disc can be made in a very quick way and so that, during the operation, the clamping of the disc is mader firmer.
  • a spacer washer 20 is used, engaged on the axial end central portion of the disc body, about the threaded pin or stud 11.
  • This threaded region can also be directly formed, for example by molding, in the disc plastic material or, possibly, it can be formed on a metal material bush to be applied to the supporting element.
  • the disc will be safely prevented from disengaging since, during the operation of the lapping machine, the threaded coupling of the disc will be reinforced, thereby providing a very firm and safe clamping of the disc body.
  • the disc can be easily disengaged from the lapping machine, as required, by operating on the disc periphery, and hence exploiting a comparatively great lever arm susceptible to facilitate a quick disengagement.
  • an abrasive disc has been provided which can be quickly and firmly coupled to the lapping machine and can be also quickly and easily disengaged from this machine, as required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP92830046A 1991-10-29 1992-02-05 Abrasive disc for lapping machines with improved locking means Withdrawn EP0542693A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI910940U 1991-10-29
IT000940 IT221984Z2 (it) 1991-10-29 1991-10-29 Disco abrasivo per macchine smerigliatrici, con mezzi di aggancio perfezionati

Publications (1)

Publication Number Publication Date
EP0542693A1 true EP0542693A1 (en) 1993-05-19

Family

ID=11359452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830046A Withdrawn EP0542693A1 (en) 1991-10-29 1992-02-05 Abrasive disc for lapping machines with improved locking means

Country Status (2)

Country Link
EP (1) EP0542693A1 (it)
IT (1) IT221984Z2 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249310A2 (de) 2001-04-09 2002-10-16 Jobra Metall GmbH Trägerteller für Lamellenschleifscheiben
EP1559509A1 (de) * 2004-01-10 2005-08-03 Festool GmbH Vorrichtung zum Verbinden eines Schleifwerkzeugs mit einer Werkzeugmaschine
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240230A (en) * 1979-01-24 1980-12-23 The Carborundum Company Throw-away adaptors for grinding wheels
US4694615A (en) * 1986-04-03 1987-09-22 Mackay Joseph H Jun Disposable depressed center grinding wheel having an integral mounting hub
US4774788A (en) * 1986-05-06 1988-10-04 Camel Grinding Wheel Works, Sarid Ltd. Grinding wheel with a single-piece hub
DE8816445U1 (de) * 1988-11-21 1989-09-28 Leurop Leutheußer KG, 8592 Wunsiedel Fächerschleifscheibe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240230A (en) * 1979-01-24 1980-12-23 The Carborundum Company Throw-away adaptors for grinding wheels
US4694615A (en) * 1986-04-03 1987-09-22 Mackay Joseph H Jun Disposable depressed center grinding wheel having an integral mounting hub
US4774788A (en) * 1986-05-06 1988-10-04 Camel Grinding Wheel Works, Sarid Ltd. Grinding wheel with a single-piece hub
DE8816445U1 (de) * 1988-11-21 1989-09-28 Leurop Leutheußer KG, 8592 Wunsiedel Fächerschleifscheibe

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249310A2 (de) 2001-04-09 2002-10-16 Jobra Metall GmbH Trägerteller für Lamellenschleifscheiben
EP1249310B1 (de) * 2001-04-09 2005-04-27 Jobra Metall GmbH Trägerteller für Lamellenschleifscheiben
EP1559509A1 (de) * 2004-01-10 2005-08-03 Festool GmbH Vorrichtung zum Verbinden eines Schleifwerkzeugs mit einer Werkzeugmaschine
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Also Published As

Publication number Publication date
ITMI910940V0 (it) 1991-10-29
ITMI910940U1 (it) 1993-04-29
IT221984Z2 (it) 1994-12-29

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