EP1864754A1 - Protective cover for an electric grinding machine - Google Patents

Protective cover for an electric grinding machine Download PDF

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Publication number
EP1864754A1
EP1864754A1 EP06076177A EP06076177A EP1864754A1 EP 1864754 A1 EP1864754 A1 EP 1864754A1 EP 06076177 A EP06076177 A EP 06076177A EP 06076177 A EP06076177 A EP 06076177A EP 1864754 A1 EP1864754 A1 EP 1864754A1
Authority
EP
European Patent Office
Prior art keywords
cover
bearing shaft
drive spindle
grinding machine
flexible interface
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Withdrawn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
EP06076177A
Other languages
German (de)
French (fr)
Inventor
Armand Leendert Leonard Van Daalen
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP06076177A priority Critical patent/EP1864754A1/en
Priority to PCT/NL2007/050267 priority patent/WO2007142524A1/en
Publication of EP1864754A1 publication Critical patent/EP1864754A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • 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

Definitions

  • the invention concerns an electric grinding machine which is especially intended for deburring, i.e. grinding burrs of e.g. metal constructions etc.
  • the present invention aims to present a grinding machine which has improved capabilities with respect to the exhaust efficiency of the particles which release during deburring and with respect to the ergonomics and manoeuvrability of the machine.
  • the grinding machine - comprising a motor part, a transmission part, a drive spindle, a connection part for mounting a grinding disk to the drive spindle and a safety and exhaust cover which partly covers the grinding disk when mounted to the drive spindle, which cover is mounted to a bearing shaft which surrounds said drive spindle - according to the invention comprises a flexible interface between said cover and said bearing shaft, enabling that the cover is movable -with respect to the shaft and - in consequence - with respect to the rest of the whole machine.
  • the flexible interface between the machine's cover and bearing shaft is preferably arranged in a way that the cover is movable along the axis of the bearing shaft.
  • the flexible interface between the machine's cover and bearing shaft is, moreover, arranged in such way that the cover is pivotally movable around the axis of the bearing shaft.
  • a preferred embodiment of the flexible interface comprises an O-ring of a flexible material between the cover and the bearing shaft, which O-ring may be made of a natural or synthetic rubber or elastomer.
  • the grinding machine shown in figure 1 comprises a motor part 1, a square, block shaped transmission part 2, a drive spindle (not shown explicitly), including a connection part for mounting a grinding disk 3 to the drive spindle and a bearing shaft 4 which surrounds said drive spindle.
  • the grinding machine may be provided with a detachable cover 5 which - when mounted to the bearing shaft surrounding the drive spindle - partly covers the grinding disk for personal safety and forming an exhaust nozzle with which can be connected, via a connection part 6 with a exhaust system (not shown).
  • the cover 5 comprises an mounting part 7 the inside shape and dimensions of which are compatible with the outside shape and dimensions of the bearing shaft 4.
  • a flexible interface is provided which is arranged in a way that the cover is movable with respect to said bearing shaft.
  • the flexible interface is formed by an O-ring 8 between the mounting part 7 of the cover 5 and the bearing shaft 4, made of a natural or synthetic rubber or elastomer.
  • the O-ring may be accommodated in a groove (not explicitly shown) in the outside of the bearing shaft 4.
  • a (shallow) groove 9 at the inside of the mounting part 7 may be provided to prevent that the cover 5 may slide off from the bearing shaft 4.
  • the mounting part 7 can be clamped around the bearing shaft 4 by means of any kind of (releasable) clamp coupling (not shown).
  • the grinding machine's cover 5 and bearing shaft being arranged - by means of the "interfacing" O-ring 8 - that the cover is movable along the axis of the bearing shaft - and thus with respect to the grinding disk -, which in practice means a substantial improvement in operational comfort and efficiency, as well as in exhaust efficiency, thanks to improved adaptation of the plain of the cover to the plain and/or shape of the construction to be deburred.
  • the grinding disk 3 can be brought closer to the construction to be deburred, viz. with less hindrance of the cover 5 thank to its flexibility, a greater deburring efficiency can be obtained.
  • the comfort and efficiency is additionally improved thanks to the ability provided by the configuration discussed here that, moreover, the mounting part 7 of the cover 5 is pivotal around the axis of the bearing shaft 4 which is additionally enabled by the flexible O-ring interface 8 between the mounting part 7 and the bearing shaft 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Grinding machine, comprising a motor part (1), a transmission part (2), a drive spindle, a connection part for mounting a grinding disk (3) to the drive spindle and a safety and exhaust cover (5) which partly covers the grinding disk when mounted to the drive spindle, which cover is mounted to a bearing shaft (4) which surrounds said drive spindle. A flexible interface between said cover and said bearing shaft is arranged in a way that the cover is movable w.r.t. said bearing shaft. The flexible interface may comprise an O-ring (8) between the cover and the bearing shaft which may be made of a natural or synthetic rubber or elastomer.

Description

  • The invention concerns an electric grinding machine which is especially intended for deburring, i.e. grinding burrs of e.g. metal constructions etc.
  • The present invention aims to present a grinding machine which has improved capabilities with respect to the exhaust efficiency of the particles which release during deburring and with respect to the ergonomics and manoeuvrability of the machine.
  • To that end in the grinding machine - comprising a motor part, a transmission part, a drive spindle, a connection part for mounting a grinding disk to the drive spindle and a safety and exhaust cover which partly covers the grinding disk when mounted to the drive spindle, which cover is mounted to a bearing shaft which surrounds said drive spindle - according to the invention comprises a flexible interface between said cover and said bearing shaft, enabling that the cover is movable -with respect to the shaft and - in consequence - with respect to the rest of the whole machine.
  • The flexible interface between the machine's cover and bearing shaft is preferably arranged in a way that the cover is movable along the axis of the bearing shaft. Preferably, the flexible interface between the machine's cover and bearing shaft is, moreover, arranged in such way that the cover is pivotally movable around the axis of the bearing shaft.
  • As will be clear from the accompanying figure, a preferred embodiment of the flexible interface comprises an O-ring of a flexible material between the cover and the bearing shaft, which O-ring may be made of a natural or synthetic rubber or elastomer.
    • Figure 1 shows such a preferred embodiment of the grinding machine according to the invention.
  • The grinding machine shown in figure 1 comprises a motor part 1, a square, block shaped transmission part 2, a drive spindle (not shown explicitly), including a connection part for mounting a grinding disk 3 to the drive spindle and a bearing shaft 4 which surrounds said drive spindle.
  • The grinding machine may be provided with a detachable cover 5 which - when mounted to the bearing shaft surrounding the drive spindle - partly covers the grinding disk for personal safety and forming an exhaust nozzle with which can be connected, via a connection part 6 with a exhaust system (not shown).
  • In the figure the cover 5 comprises an mounting part 7 the inside shape and dimensions of which are compatible with the outside shape and dimensions of the bearing shaft 4.
  • Between the bearing shaft 4 and the cover's mounting part 7 a flexible interface is provided which is arranged in a way that the cover is movable with respect to said bearing shaft. In the shown embodiment the flexible interface is formed by an O-ring 8 between the mounting part 7 of the cover 5 and the bearing shaft 4, made of a natural or synthetic rubber or elastomer. The O-ring may be accommodated in a groove (not explicitly shown) in the outside of the bearing shaft 4. Moreover a (shallow) groove 9 at the inside of the mounting part 7 may be provided to prevent that the cover 5 may slide off from the bearing shaft 4.
  • The mounting part 7 can be clamped around the bearing shaft 4 by means of any kind of (releasable) clamp coupling (not shown).
  • In the preferred embodiment shown in figure 1 the grinding machine's cover 5 and bearing shaft being arranged - by means of the "interfacing" O-ring 8 - that the cover is movable along the axis of the bearing shaft - and thus with respect to the grinding disk -, which in practice means a substantial improvement in operational comfort and efficiency, as well as in exhaust efficiency, thanks to improved adaptation of the plain of the cover to the plain and/or shape of the construction to be deburred. As the grinding disk 3 can be brought closer to the construction to be deburred, viz. with less hindrance of the cover 5 thank to its flexibility, a greater deburring efficiency can be obtained.
  • Besides, the comfort and efficiency is additionally improved thanks to the ability provided by the configuration discussed here that, moreover, the mounting part 7 of the cover 5 is pivotal around the axis of the bearing shaft 4 which is additionally enabled by the flexible O-ring interface 8 between the mounting part 7 and the bearing shaft 4.

Claims (5)

  1. Grinding machine, comprising a motor part (1), a transmission part (2), a drive spindle, a connection part for mounting a grinding disk (3) to the drive spindle and a safety and exhaust cover (5) which partly covers the grinding disk when mounted to the drive spindle, which cover is mounted to a bearing shaft (4) which surrounds said drive spindle, characterized by a flexible interface between said cover and said bearing shaft which is arranged in a way that the cover is movable with respect to said bearing shaft.
  2. Grinding machine according to claim 1, said flexible interface between the machine's cover and bearing shaft being arranged in a way that the cover is movable along the axis of the bearing shaft.
  3. Grinding machine according to claim 1 or 2, said flexible interface between the machine's cover and bearing shaft being arranged in a way that the cover is pivotally movable around the axis of the bearing shaft.
  4. Grinding machine according to any of the preceding claims, said flexible interface comprising an O-ring (8) of a flexible material between the cover and the bearing shaft.
  5. Grinding machine according to claim 4, said O-ring being made of a natural or synthetic rubber or elastomer.
EP06076177A 2006-06-06 2006-06-06 Protective cover for an electric grinding machine Withdrawn EP1864754A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06076177A EP1864754A1 (en) 2006-06-06 2006-06-06 Protective cover for an electric grinding machine
PCT/NL2007/050267 WO2007142524A1 (en) 2006-06-06 2007-06-06 Protective cover for an electric grinding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06076177A EP1864754A1 (en) 2006-06-06 2006-06-06 Protective cover for an electric grinding machine

Publications (1)

Publication Number Publication Date
EP1864754A1 true EP1864754A1 (en) 2007-12-12

Family

ID=36866315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06076177A Withdrawn EP1864754A1 (en) 2006-06-06 2006-06-06 Protective cover for an electric grinding machine

Country Status (2)

Country Link
EP (1) EP1864754A1 (en)
WO (1) WO2007142524A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469788A (en) * 2009-01-13 2010-11-03 David Vincent Byrne Wall chaser with electrically insulating safety cover
FR2955279A1 (en) * 2010-01-15 2011-07-22 Snp2I Device for extracting dust from ejection cone of grinding machine during grinding of workpiece, has dust stopping element integrated to casing and mounted tangentially to portion of casing, where casing partially surrounds grinding wheel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6684006B1 (en) * 2019-07-31 2020-04-22 株式会社丸高工業 Dust cover for power tools and power tools

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059930A (en) * 1975-07-30 1977-11-29 The Black And Decker Manufacturing Company Removable guard arrangement for a power tool having a rotating head for performing work on a workpiece
GB1577286A (en) * 1977-12-17 1980-10-22 Bosch Gmbh Robert Protective hood for attachment to a hand tool machine especially an electric hand tool
EP0577574A1 (en) * 1992-06-29 1994-01-05 Atlas Copco Tools Ab, Stockholm Pneumatic rotation grinder
EP0978353A2 (en) * 1998-08-01 2000-02-09 C. & E. FEIN GmbH & Co. Grinding machine with removable protective cover
US6561063B1 (en) * 2000-08-18 2003-05-13 Campbell Hausfeld/Scott Fetzer Company Hand-held rotary cut-off tool
DE10235923A1 (en) * 2002-08-06 2004-02-26 Metabowerke Gmbh Angle- or cutting grinder in electric hand tool form, has protective guard with clamping band carrying projections engaging recesses in clamping collar
EP1618990A1 (en) * 2004-07-16 2006-01-25 Narex Ceska Lipa a.s. Power tool, especially angle grinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135334A (en) * 1976-09-27 1979-01-23 Firma Robert Bosch Gmbh Dust exhaust hood
US4635434A (en) * 1985-03-14 1987-01-13 Suzuki Ken Ichi Protective device for a grinder or the like
GB2260721A (en) * 1991-10-24 1993-04-28 Stevens Fibreglass Limited Sanding tool with dust collector
EP0885089A1 (en) * 1996-03-06 1998-12-23 Ulrich Wagner Protection and suction hood sealingly set on a hand grinding and polishing machine
US5791979A (en) * 1997-03-17 1998-08-11 Duncan; C. Warren Grinding vacuum shroud

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059930A (en) * 1975-07-30 1977-11-29 The Black And Decker Manufacturing Company Removable guard arrangement for a power tool having a rotating head for performing work on a workpiece
GB1577286A (en) * 1977-12-17 1980-10-22 Bosch Gmbh Robert Protective hood for attachment to a hand tool machine especially an electric hand tool
EP0577574A1 (en) * 1992-06-29 1994-01-05 Atlas Copco Tools Ab, Stockholm Pneumatic rotation grinder
EP0978353A2 (en) * 1998-08-01 2000-02-09 C. & E. FEIN GmbH & Co. Grinding machine with removable protective cover
US6561063B1 (en) * 2000-08-18 2003-05-13 Campbell Hausfeld/Scott Fetzer Company Hand-held rotary cut-off tool
DE10235923A1 (en) * 2002-08-06 2004-02-26 Metabowerke Gmbh Angle- or cutting grinder in electric hand tool form, has protective guard with clamping band carrying projections engaging recesses in clamping collar
EP1618990A1 (en) * 2004-07-16 2006-01-25 Narex Ceska Lipa a.s. Power tool, especially angle grinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469788A (en) * 2009-01-13 2010-11-03 David Vincent Byrne Wall chaser with electrically insulating safety cover
FR2955279A1 (en) * 2010-01-15 2011-07-22 Snp2I Device for extracting dust from ejection cone of grinding machine during grinding of workpiece, has dust stopping element integrated to casing and mounted tangentially to portion of casing, where casing partially surrounds grinding wheel

Also Published As

Publication number Publication date
WO2007142524A1 (en) 2007-12-13

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