EP2502704A1 - Outil électrique - Google Patents

Outil électrique Download PDF

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Publication number
EP2502704A1
EP2502704A1 EP12156650A EP12156650A EP2502704A1 EP 2502704 A1 EP2502704 A1 EP 2502704A1 EP 12156650 A EP12156650 A EP 12156650A EP 12156650 A EP12156650 A EP 12156650A EP 2502704 A1 EP2502704 A1 EP 2502704A1
Authority
EP
European Patent Office
Prior art keywords
spindle
inner member
tool
pair
disc
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Withdrawn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
EP12156650A
Other languages
German (de)
English (en)
Inventor
Fumitoshi Numata
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.)
Makita Corp
Original Assignee
Makita Corp
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 Makita Corp filed Critical Makita Corp
Publication of EP2502704A1 publication Critical patent/EP2502704A1/fr
Withdrawn legal-status Critical Current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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors

Definitions

  • the present invention relates to power tools in which a disc-shaped tool is attached to a tip end of a spindle by a nut member.
  • a grinder as an example of power tools typically includes a disc-like tool attached via a nut member to a tip end of a spindle protruding from a main body, and a brake device configured to brake the spindle.
  • the nut member may become loose during operation of the brake device.
  • European Patent No. 1,663,574 discloses a grinder which has a brake device and is configured to prevent a nut member from loosening.
  • a disc-like tool penetrated through a tip of a spindle is held between a nut member tightened on the tip of the spindle, and an inner member provided in a main body of the grinder and configured to prevent the nut member from rotating in a direction to loosen during operation of the brake device.
  • This grinder includes the inner member having one wedge member, and the spindle having the other wedge member.
  • the inner member slidingly contacts the other wedge member on the spindle, the inner member is pressed toward the disc-like tool, and then the nut member is pressed via the disc-like tool. Consequently, the nut member can be prevented from rotating in a direction to loosen.
  • the disc-like tool is integrated with a spindle by being held between an inner member such as an inner flange and a nut member.
  • an inner member such as an inner flange and a nut member.
  • a user attaches the inner member configured to prevent the nut member from loosening to the spindle as disclosed in European Patent No. 1,663,574 , he may misunderstand the inner member as a member configured only to prevent the nut member from loosening, and additionally attach a member configured to hold the disc-like tool.
  • the inner member to prevent the nut member from loosening may be prevented from moving toward the disc-like tool during operation of the brake device. In this case, the nut member cannot be prevented from loosening.
  • the present invention is proposed in view of the above problems, and it is an object of the present invention to provide a power tool which is configured to prevent a nut member screwed on the spindle from loosening during operation of a brake device, wherein the power tool includes an inner member comprising a member to prevent the nut member from loosening and a member to hold a tool
  • a power tool includes a main body, a brake device provided in the main body, a spindle protruding from the main body, an inner member provided on the spindle, a pressing portion provided integrally with the spindle, a nut member that can be screwed on a tip end of the spindle and a disc-like tool though which the spindle extends perpendicularly so that the disc-like tool can be held between the inner member and the nut member.
  • the inner member comprises a first inner member and a second inner member. The first inner member contacts the pressing portion and is pressed toward the disc-like tool when the brake device is operated.
  • the second inner member through which the spindle extends is detachably attached to the first inner member and rotatable together with the first inner member. Further, the disc-like tool can be held between the second inner member and the nut member when the second inner member is attached to the first inner member.
  • a width-across-flat portion parallel to a direction perpendicular to an axis of the spindle is provided on an outer periphery of the first inner member.
  • the pressing portion is a pair of flange portions that are provided to protrude in a radial direction of the spindle at positions symmetrical with respect to an axis of the spindle.
  • the pair of flange portions has a pressing surface facing the first inner member, while the first inner member has a fitting recess as a pressed surface in which the pair of flange portions is fitted with play so that the pressing surface of the pair of flange portions contacts a bottom of the fitting recess.
  • the first inner member to prevent the nut member from loosening and the second inner member to attach the disc-like tool to the spindle by holding the tool with the nut member are provided as separate members. Accordingly, it becomes easier for users to recognize the member to prevent the nut member form loosening and the member to hold the disc-like tool. Therefore, another member to hold the disc-like tool is prevented from being additionally attached by mistake, which allows the first inner member to reliably prevent the nut member from loosening when the spindle is braked by the brake device. Therefore, the nut member can be prevented from loosening.
  • rotation of the spindle can be stopped by engaging a tool such as a spanner on the width-across-flat portion of the first inner member that contacts the spindle. Therefore, the nut member is easily attached to or detached from the spindle whose rotation has been stopped. Accordingly, easy assembly can improve both the efficiency of the operation of holding the disc-like tool between the second inner member and the nut member to attach the disc-like tool to the spindle, and the efficiency of the operation of removing the disc-like tool together with the nut member from the spindle 16.
  • rotation of the spindle can be transmitted to the first inner member with the pair of flange portions being fitted in the fitting recess of the first inner member, and an inertial force of the disc-like tool can be received by the entire flange portions fitted in the fitting recess. Therefore, concentration of the inertial force on a part of the flange portions can be suppressed, and damage to the flange portions can be prevented.
  • a grinder 1 includes a housing 10, a locking member 20, an inner flange 30, a lock nut 40, and a brake device 50. It should be noted that the grinder 1 is an example of the power tool of the present invention.
  • the housing 10 comprises a cylindrical motor housing 11 and a gear housing 15.
  • a motor M is accommodated in the motor housing 11, and a rotation shaft 12 of the motor M is rotatably supported in the motor housing 11 via a bearing 13.
  • a first bevel gear 14 is provided on a tip end of the rotation shaft 12.
  • the gear housing 15 is attached in front of the motor housing 11, and the rotation shaft 12 protrudes from the motor housing 11 into the gear housing 15.
  • a spindle 16 is rotatably supported in the gear housing 15 via a bearing 17 so as to extend perpendicularly to the rotation shaft 12.
  • a second bevel gear 18 is fitted on an upper part of the spindle 16.
  • the first bevel gear 14 meshes with the second bevel gear 18, whereby rotation of the rotation shaft 12 is transmitted to the spindle 16.
  • a lower end of the spindle 16 protrudes below the gear housing 15.
  • a pair of flange portions 16A and 16B and an externally threaded portion 16C are formed on a part of the spindle 16 which protrudes from the gear housing 15.
  • the housing 10 is an example of the main body of the present invention.
  • the pair of flange portions 16A and 16B are shaped to protrude in a radial direction of the spindle 16 at positions symmetrical with respect to the axis of the spindle 16, and are provided integrally with the spindle 16.
  • the lower surfaces of the pair of flange portions 16A and 16B are tilted surfaces 19A and 19B that form a predetermined angle with respect to a plane perpendicular to the axis of the spindle 16.
  • the locking member 20 is a disc-like member, and as shown in FIGS. 2 , 5, and 6 , includes width-across-flat portions 21 and a fitting recess 22.
  • the width-across-flat portions 21 are formed on the outer periphery of the locking member 20, and extend parallel with each other on both sides of the spindle 16 in a direction perpendicular to the axis of the spindle 16.
  • the fitting recess 22 opens in an upper surface of the locking member 20, and the flange portions 16A and 16B are fitted in the fitting recess 22 with play in a rotation direction.
  • An insertion hole 23 through which the lower end of the spindle 16 is inserted is formed in the center of a bottom surface of the fitting recess 22.
  • Tilted surfaces 24A and 24B are provided on the bottom surface of the fitting recess 22.
  • the tilted surfaces 24A and 24B can contact the tilted surfaces 19A and 19B, respectively, when the flange portions 16A and 16B are fitted in the fitting recess 22.
  • the tilted surfaces 19A and 19B are formed as the lower surfaces of the flange portions 16A and 16B at such positions that they face the tilted surfaces 24A and 24B when the flange portions 16A and 16B are fitted in the fitting recess 22.
  • a protrusion 25 that protrudes downward is formed on the lower surface of the locking member 20.
  • the insertion hole 23 extends through the protrusion 25.
  • the inner flange 30 is a disc-like member having a larger diameter than the locking member 20, and includes a recess groove 31 and a through hole 32.
  • the recess groove 31 extends in a direction perpendicular to the axis of the spindle 16.
  • the inner flange 30 can be attached to or detached from the locking member 20 by engaging or disengaging the protrusion 25 of the locking member 20 with or from the recess groove 31. With the inner flange 30 being attached to the locking member 20, the spindle 16 inserted through the insertion hole 23 is inserted through the through hole 32 as well, and thus extends through the inner flange 30.
  • the lock nut 40 can be attached to a tip end of the spindle 16 by screwing the externally threaded portion 16C into a screw hole (not shown).
  • the spindle 16 extends through a disc-like grinding stone 45 provided perpendicularly to the spindle 16.
  • the grinding stone 45 is held between the inner flange 30 attached to the locking member 20 and the lock nut 40 attached to the tip end of the spindle 16, and thus is fixed to the spindle 16.
  • a rear part of the grinding stone 45 is covered by a safety cover 46 mounted below the gear housing 15.
  • the inner flange 30 need not necessarily be attached to the locking member 20, and the grinding stone 45 may be fixed to the spindle 16 by holding the grinding stone 45 between the locking member 20 and the lock nut 40.
  • the grinding stone 45 is an example of the disc-like tool of the present invention
  • the lock nut 40 is an example of the nut member of the present invention.
  • the locking member 20 is an example of the first inner member of the present invention
  • the inner flange 30 is an example of the second inner member of the present invention.
  • the brake device 50 is provided to stop rotation of the spindle 16 by braking the rotation shaft 12 of the motor M, and is accommodated in a front part of the motor housing 11. As shown in FIG 1 , the brake device 50 includes a brake plate 51, a brake member 52, and a coiled spring B.
  • the brake plate 51 is a cylindrical member having a disc-like flange portion provided on the periphery thereof, and is mounted on the rotation shaft 12.
  • the brake member 52 is placed in front of the brake plate 51 in an axial direction of the rotation shaft 12.
  • a brake shoe 53 is fixed to a rear surface of the brake member 52 that faces the brake plate 51.
  • the coiled spring B is fitted in the motor housing 11, and biases the brake member 52 in a direction to bring the brake member 52 into contact with the brake plate 51.
  • the brake member 52 is separated from the brake plate 51 in response to the operation of turning on a drive switch (not shown) of the motor M, and the brake shoe 53 is pressed hard against the brake plate 51 by a biasing force of the coiled spring B in response to the operation of turning off the drive switch so that rotation of the rotation shaft 12 and the spindle 16 can be stopped in this manner.
  • the spindle 16 is first inserted through the insertion hole 23 of the locking member 20.
  • the flange portions 16A and 16B are then fitted in the fitting recess 22 of the locking member 20 so that the tilted surfaces 19A, 19B contact the tilted surfaces 24A and 24B.
  • the locking member 20 is attached to the spindle 16 via a C ring so as to be retained on the spindle 16.
  • the protrusion 25 of the locking member 20 is engaged with the recess groove 31 of the inner flange 30 to attach the inner flange 30 to the locking member 20.
  • the lock nut 40 is screwed onto the spindle 16 extending through the grinding stone 45, so that the grinding stone 45 is held between the inner flange 30 and the lock nut 40.
  • the spindle 16 rotates in a direction to tighten the lock nut 40.
  • the side surfaces of the flange portions 16A and 16B contact an inner surface 22A (see FIG 5 ) of the fitting recess 22. Therefore, rotation of the spindle 16 is transmitted to the locking member 20.
  • the inner flange 30 having the locking member 20 attached thereto rotates together with the locking member 20.
  • the locking member 20 is configured to prevent the lock nut 40 from loosening in the direction to loosen the lock nut 40 (a locking mechanism). That is, if rotation of the rotation shaft 12 is stopped, the tilted surfaces 19A and 19B of the flange portions 16A and 16B slidingly contact the tilted surfaces 24A and 24B of the locking member 20. Therefore, the tilted surfaces 19A and 19B press the tilted surfaces 24A and 24B toward the grinding stone 45, and then the inner flange 30 attached to the locking member 20 is pressed toward the grinding stone 45. Therefore, the lock nut 40 is pressed via the grinding stone 45 so as to prevent the lock nut 40 from rotating in the direction to loosen the lock nut 40.
  • the flange portions 16A and 16B are an example of the pressing portion of the present invention.
  • the tilted surfaces 19A and 19B are an example of the pressing surface of the first inner member of the present invention, and the tilted surfaces 24A and 24B are an example of the pressed surface of the present invention.
  • Rotation of the spindle 16 can be prevented by engaging, e.g., a spanner on the width-across-flat portions 21 of the locking member 20 attached to the spindle 16.
  • the lock nut 40 can be easily attached to or detached from the spindle 16 whose rotation has been stopped. Accordingly, the grinding stone 45 can be easily replaced with a new one.
  • the locking member 20 to prevent the lock nut 40 from loosening and the inner flange 30 to fix the grinding stone 45 to the spindle 16 are provided as separate members. Accordingly, it becomes easier for users to recognize the member to prevent the lock nut 40 from loosening and the member to fix the grinding stone 45. Therefore, in order to fix the grinding stone 45, a member except the inner flange 30 can be prevented from being additionally attached to the spindle 16, which allows the locking member 20 to reliably prevent the lock nut 40 from loosening when rotation of the spindle 16 is stopped by the brake device 50. Therefore, the lock nut 40 can be prevented from loosening.
  • Rotation of the spindle 16 can be stopped by engaging a spanner on the width-across-flat portions 21 of the locking member 20 having the flange portions 16A and 16B of the spindle 16 fitted therein. Therefore, it becomes easier for users to attach or detach the lock nut 40 to or from the spindle 16 whose rotation has been stopped. Consequently, easy assembly can improve both the efficiency of the operation of holding the grinding stone 45 between the inner flange 30 and the lock nut 40 to fix the grinding stone 45 to the spindle 16, and the efficiency of the operation of removing the grinding stone 45 together with the lock nut 40 from the spindle 16.
  • a recess may be provided in the inner flange 30 instead of the recess groove 31, and the inner flange 30 can be attached to or detached from the locking member 20 by fitting the protrusion 25 of the locking member 20 in the recess.
  • the inner flange 30 may have a protrusion protruding upward, and the locking member 20 may have a recess groove with and from which the protrusion is engaged or disengaged, so that the inner flange 30 can be attached to or detached from the locking member 20.
  • the locking member 20 may not have the width-across-flat portions 21, and the brake device 50 may be an electric brake that brakes the motor M.
  • the brake device 50 may be an electric brake that brakes the motor M.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Gripping On Spindles (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Portable Power Tools In General (AREA)
EP12156650A 2011-03-23 2012-02-23 Outil électrique Withdrawn EP2502704A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011064688A JP2012200794A (ja) 2011-03-23 2011-03-23 電動工具

Publications (1)

Publication Number Publication Date
EP2502704A1 true EP2502704A1 (fr) 2012-09-26

Family

ID=45656500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12156650A Withdrawn EP2502704A1 (fr) 2011-03-23 2012-02-23 Outil électrique

Country Status (5)

Country Link
US (1) US20120244788A1 (fr)
EP (1) EP2502704A1 (fr)
JP (1) JP2012200794A (fr)
CN (1) CN102689293A (fr)
RU (1) RU2012111083A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11806857B2 (en) 2020-08-28 2023-11-07 Black & Decker, Inc. Airflow intake configuration in power tool

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
US8958763B2 (en) 2010-04-20 2015-02-17 Rf Micro Devices, Inc. PA bias power supply undershoot compensation
US8942650B2 (en) 2010-04-20 2015-01-27 Rf Micro Devices, Inc. RF PA linearity requirements based converter operating mode selection
US8983407B2 (en) 2010-04-20 2015-03-17 Rf Micro Devices, Inc. Selectable PA bias temperature compensation circuitry
US8913967B2 (en) 2010-04-20 2014-12-16 Rf Micro Devices, Inc. Feedback based buck timing of a direct current (DC)-DC converter
US9030256B2 (en) 2010-04-20 2015-05-12 Rf Micro Devices, Inc. Overlay class F choke
JP5447980B2 (ja) * 2010-07-16 2014-03-19 株式会社マキタ 電動工具におけるブレーキ機構の選択構造
DE102010043185A1 (de) * 2010-10-29 2012-05-03 Robert Bosch Gmbh Werkzeugmaschinenbremsvorrichtung
CN107471044A (zh) * 2016-06-08 2017-12-15 南京德朔实业有限公司 手持式电动工具
CN110177659B (zh) * 2017-01-13 2022-10-18 株式会社牧田 电动工具
JP6976760B2 (ja) * 2017-07-14 2021-12-08 株式会社マキタ 回転工具
US11396078B2 (en) * 2019-06-10 2022-07-26 Makita Corporation Grinder

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE3613987A1 (de) * 1986-04-25 1987-10-29 Metabowerke Kg Vorrichtung zum loesbaren befestigen einer schleifscheibe
DE19510291A1 (de) * 1995-03-22 1996-09-26 Bosch Gmbh Robert Handwerkzeugmaschine
DE10017457A1 (de) * 2000-04-07 2001-10-11 Bosch Gmbh Robert Schleifmaschinenwerkzeugaufnahme
EP1663574A1 (fr) 2003-08-18 2006-06-07 Robert Bosch GmbH Machine-outil portative

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US3899852A (en) * 1974-08-23 1975-08-19 Singer Co Spindle drive assembly for a surface-treating machine
DE3906549A1 (de) * 1989-03-02 1990-09-06 Bosch Gmbh Robert Exzenterschleifer
US5464365A (en) * 1991-09-21 1995-11-07 Robert Bosch Gmbh Motor-driven hand-held machine tool
DE4233729A1 (de) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Exzentertellerschleifer mit Schleiftellerbremse
US5718621A (en) * 1996-09-11 1998-02-17 Turley; Edward Michael Reversible angle grinder with top arbour lock
DE19650364A1 (de) * 1996-12-05 1998-06-10 Bosch Gmbh Robert Handwerkzeugmaschine
JP3542737B2 (ja) * 1999-04-16 2004-07-14 株式会社マキタ 電動工具におけるロックナットの緩み防止機構
US6264539B1 (en) * 2000-01-12 2001-07-24 Tony Chen Mechanism for slowing down idling shoe of an electric polisher
DE10017458A1 (de) * 2000-04-07 2001-10-18 Bosch Gmbh Robert Schleifmaschinenwerkzeugaufnahme
US6523214B1 (en) * 2000-06-14 2003-02-25 Richard A. Kaiser Quick mount attachment for rotary finishing tool
DE10031761A1 (de) * 2000-06-29 2002-01-10 Bosch Gmbh Robert Exzentertellerschleifmaschine mit einem zylindrischen Gehäuse
GB2380151B (en) * 2001-07-20 2004-09-22 Black & Decker Inc Oscillating hand tool
CN2552631Y (zh) * 2002-06-13 2003-05-28 苏州宝时得电动工具有限公司 具有盘状工具夹紧装置的电动工具机
DE102006001986A1 (de) * 2006-01-16 2007-07-19 Robert Bosch Gmbh Spannvorrichtung zum lösbaren Befestigen eines scheibenförmigen Werkzeugs
DE102006030559A1 (de) * 2006-07-03 2008-01-10 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
EP2123380A4 (fr) * 2007-01-09 2011-10-12 Makita Corp Dispositif de fixation pour outil à lame tournante

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3613987A1 (de) * 1986-04-25 1987-10-29 Metabowerke Kg Vorrichtung zum loesbaren befestigen einer schleifscheibe
DE19510291A1 (de) * 1995-03-22 1996-09-26 Bosch Gmbh Robert Handwerkzeugmaschine
DE10017457A1 (de) * 2000-04-07 2001-10-11 Bosch Gmbh Robert Schleifmaschinenwerkzeugaufnahme
EP1663574A1 (fr) 2003-08-18 2006-06-07 Robert Bosch GmbH Machine-outil portative

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11806857B2 (en) 2020-08-28 2023-11-07 Black & Decker, Inc. Airflow intake configuration in power tool

Also Published As

Publication number Publication date
US20120244788A1 (en) 2012-09-27
RU2012111083A (ru) 2013-09-27
JP2012200794A (ja) 2012-10-22
CN102689293A (zh) 2012-09-26

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