EP2505308A1 - Outil électrique - Google Patents

Outil électrique Download PDF

Info

Publication number
EP2505308A1
EP2505308A1 EP12157709A EP12157709A EP2505308A1 EP 2505308 A1 EP2505308 A1 EP 2505308A1 EP 12157709 A EP12157709 A EP 12157709A EP 12157709 A EP12157709 A EP 12157709A EP 2505308 A1 EP2505308 A1 EP 2505308A1
Authority
EP
European Patent Office
Prior art keywords
dust
tool
collecting cover
spindle
insertion opening
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Withdrawn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
EP12157709A
Other languages
German (de)
English (en)
Inventor
Hideharu Muto
Shin Nakamura
Kenichi Tabushi
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 EP2505308A1 publication Critical patent/EP2505308A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
    • 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

Definitions

  • the present invention relates to a power tool including a dust-collecting cover that covers a disc-shaped tool attached to a spindle, and collects dust produced when a workpiece is machined.
  • a grinder disclosed in Japanese Patent Application Publication No. 2011-56641 includes a spindle that is rotated by a motor housed in a housing, a disc-shaped grinding tool attached to the spindle, and a dust-collecting cover that covers the periphery of the grinding tool.
  • the grinder grinds a workpiece by moving the rotating grinding tool on the workpiece while keeping the grinding tool in contact with the workpiece. Dust produced during grinding is collected in the dust-collecting cover, and then discharged from a dust-collecting tube that communicates with the interior of the dust-collecting cover, into a dust collector, via a suction hose.
  • the dust-collecting cover has a tool insertion opening through which a rotation stopping tool, such as a spanner, can be inserted into the opening of the cover.
  • a rotation stopping tool such as a spanner
  • rotation of the spindle can be stopped by means of the rotation stopping tool inserted through the opening formed on the cover.
  • the dust-collecting cover having the tool insertion opening the inside and outside of the dust-collecting cover communicate with each other via the tool insertion opening, and the air tightness within the dust-collecting cover is reduced. Accordingly, efficiency of dust collection in the dust-collecting cover is reduced.
  • This invention is proposed in view of the above situation, and it is an object of the present invention to provide a power tool in which dust is collected in a dust-collecting cover with enhanced efficiency, and rotation of a spindle can be stopped using a rotation stopping tool.
  • a power tool which includes a housing, a motor housed in the housing, a spindle that protrudes from the housing, a disc-shaped tool attached to the spindle, a dust-collecting cover that is provided on the housing, and covers the disc-shaped tool, and a tool insertion opening that is formed in the dust-collecting cover, and enables a rotation stopping tool that stops rotation of the spindle to be inserted into the dust-collecting cover.
  • the dust-collecting cover is provided with an opening and closing member that blocks the tool insertion opening such that the tool insertion opening can be opened and closed as desired.
  • the opening and closing member may be a ring-shaped rubber member that is mounted on the dust-collecting cover and blocks the tool insertion opening.
  • the opening and closing member blocks the tool insertion opening formed in the dust-collecting cover, and therefore, the air tightness of the dust-collecting cover is improved. Accordingly, the efficiency of dust collection in the dust-collecting cover can be enhanced. If the tool insertion opening is rendered open to the dust-collecting cover, using the opening and closing member, the rotation stopping tool can be inserted into the dust-collecting cover, through the opened tool insertion opening, so as to stop rotation of the spindle.
  • the air tightness of the dust-collecting cover is improved, and the efficiency of dust collection in the dust-collecting cover can be enhanced. Further, when the rubber member is rolled up, the tool insertion opening of the dust-collecting cover appears, and the rotation stopping tool can be inserted into the dust-collecting cover through the tool insertion opening, so as to stop rotation of the spindle.
  • a disc grinder 1 shown in FIG 1 includes a housing 10 and a dust-collecting cover 20.
  • the housing 10 consists of a motor housing 11 and a gear housing 15.
  • the disc grinder 1 is one example of power tool of the present invention.
  • the motor housing 11 is formed in a cylindrical shape, and a motor M is housed in the motor housing 11.
  • a rotary shaft 12 of the motor M is rotatably supported in the motor housing 11 via a bearing 13, and a first bevel gear 14 is provided at a distal end of the rotary shaft 12.
  • the gear housing 15 is mounted to the front (the left-hand side in FIG 1 ) of the motor housing 11, and the rotary shaft 12 supported in the motor housing 11 protrudes into the gear housing 15.
  • a spindle 16 is rotatably supported in the gear housing 15 via bearings 17, 18, to extend in a direction perpendicular to the rotary shaft 12.
  • a second bevel gear 19 is mounted on an upper portion of the spindle 16. With the first bevel gear 14 engaging with the second bevel gear 19, rotation of the rotary shaft 12 is transmitted to the spindle 16.
  • the lower end of the spindle 16 protrudes downwardly of the gear housing 15, and an external threaded portion 16A is formed on an outer circumferential surface of a lower end portion of the spindle 16.
  • a disc-shaped grinding tool (not shown) is sandwiched between an inner flange and a lock nut screwed on the external threaded portion 16A, and is thus attached to the spindle 16.
  • the disc-shaped grinding tool is one example of disc-shaped tool of the present invention.
  • the dust-collecting cover 20 includes a main cover 21, an auxiliary cover 22, a plate 23, a holder portion 24, and a rubber ring 26.
  • the main cover 21 and the auxiliary cover 23 are formed of resin, and the main cover 21 is provided at its upper surface with an insert hole 21A through which the spindle 16 can be inserted.
  • the auxiliary cover 22 is detachably or removably attached to the main cover 21.
  • the dust-collecting cover 20 assumes a generally bowl-like shape that has a larger diameter than the disc-shaped grinding tool and is open downwards, and surrounds the periphery of the grinding tool.
  • a dust-collecting tube 21B that communicates with the interior of the main cover 21 is provided on the outer surface of the main cover 21.
  • a dust collector can be connected to the dust-collecting tube 21B via a suction hose.
  • the plate 23 is made of metal, and is fixed to the upper surface of the main cover 21 by means of four screws 23A.
  • the plate 23 is formed with an opening 23B that communicates with the insert hole 21A of the main cover 21.
  • a tool insertion slot 24B is formed in a base portion of the holder portion 24 in the vicinity of the boundary between the plate 23 and the holder portion 24.
  • the tool insertion slot 24B is used for inserting a spanner 25 into the dust-collecting cover 20.
  • the rubber ring 26, which has a flange portion 26A (see FIG 3 ) provided at its lower end portion and extending in radial directions, is fitted along the outer circumferential surface of the above-mentioned base portion.
  • the rubber ring 26 which is in close contact with the outer circumferential surface of the base portion, normally blocks the tool insertion slot 24B, and the flange portion 26A, which is in close contact with the upper surface of the plate 23, closes a clearance between the rubber ring 26 and the upper surface.
  • the rubber ring 26 is one example of ring-shaped rubber member of the present invention.
  • the operation of the disc grinder 1 will be described.
  • the operator holds the motor housing 11, and turns a switch ON so as to drive the motor M to operate the dust collector.
  • the grinding tool that rotates with the motor M thus driven is moved on a worked surface of the workpiece while being kept in contact with the worked surface, so as to grind the worked surface. Dust produced during grinding of the worked surface is sucked and collected from the duct-collecting tube 21B into the dust collector via the suction hose.
  • the rubber ring 26 blocks the tool insertion slot 24B, and the flange portion 26A closes the clearance between the rubber ring 26 and the upper surface of the plate 23; therefore, the inside and outside of the dust-collecting cover 20 do not communicate with each other, and the dust-collecting cover 20 is sealed with improved tightness. Accordingly, the dust is prevented from scattering out of the dust-collecting cover 20, and the dust-collecting efficiency of the dust-collecting cover 20 is enhanced.
  • a lock mechanism for stopping rotation of the spindle 16 fails when a worn grinding tool is to be replaced by a new one, for example, the rotation of the spindle 16 needs to be stopped by a spanner 25.
  • the rubber ring 26 is rolled up so that the tool insertion slot 24B is open to a surface of the dust-collecting cover 20, as shown in FIG 3 .
  • the spanner 25 is inserted into the dust-collecting cover 20 through the tool insertion slot 24B, to be engaged with a chamfered portion formed on the spindle 16, so as to stop rotation of the spindle 16.
  • the spanner 25 is one example of rotation stopping tool of the present invention.
  • the rubber ring 26 blocks the tool insertion slot 24B, so that the dust-collecting cover 20 is sealed with improved tightness. As a result, the efficiency of dust collection in the dust-collecting cover 20 can be enhanced. Also, by rolling up the rubber ring 26, it is possible to open the tool insertion slot 24B to the dust-collecting cover 20. Then it becomes possible to insert the spanner 25 into the dust-collecting cover 20 through the tool insertion slot 24B, and stop rotation of the spindle 16 with the spanner 25.
  • the present invention is not limited to the above-described embodiment, but may be embodied by changing a part of the construction as needed, without departing from the principle of the invention.
  • the rubber ring 26 may be replaced by an O ring made of rubber, and the O ring may be fitted along the outer circumferential surface of the above-mentioned base portion, so that the O ring blocks the tool insertion slot 24B.
  • an opening and closing plate that is rotatable in the vertical direction via a hinge member may be mounted on the holder portion 24, and the tool insertion slot 24B may be blocked by the opening and closing plate, such that the tool insertion slot 24B can be opened or closed as desired.
  • dust can be collected in the dust-collecting cover 20 with enhanced efficiency, and the rotation of the spindle 16 can be stopped by the spanner 25, as in the above-described embodiment.
  • a rubber magnet that is detachably attached to the holder portion 24 may be provided, in place of the above-described rubber ring 26, for blocking the tool insertion slot 24B such that the tool insertion slot 24B can be opened or closed as desired.
  • dust can be collected in the dust-collecting cover 20 with enhanced efficiency, and the rotation of the spindle 16 can be stopped by the spanner 25, as in the above-described embodiment.
  • the opening and closing plate and the rubber magnet are examples of opening and closing member of the present invention. While the present invention is applied to the disc grinder in the above-described embodiment, the application is not limited to this example, but the present invention may also be applied to a power tool, such as a sander or a cutter having a dust-collecting cover.

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)
  • Auxiliary Devices For Machine Tools (AREA)
  • Portable Power Tools In General (AREA)
EP12157709A 2011-03-31 2012-03-01 Outil électrique Withdrawn EP2505308A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011079521A JP2012213820A (ja) 2011-03-31 2011-03-31 電動工具

Publications (1)

Publication Number Publication Date
EP2505308A1 true EP2505308A1 (fr) 2012-10-03

Family

ID=45808214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12157709A Withdrawn EP2505308A1 (fr) 2011-03-31 2012-03-01 Outil électrique

Country Status (5)

Country Link
US (1) US20120252328A1 (fr)
EP (1) EP2505308A1 (fr)
JP (1) JP2012213820A (fr)
CN (1) CN102729143A (fr)
RU (1) RU2012112407A (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5579575B2 (ja) * 2010-11-02 2014-08-27 株式会社マキタ ディスクグラインダ
CN104395038B (zh) * 2012-07-03 2016-12-14 阿特拉斯·科普柯工业技术公司 电动工具
JP6043195B2 (ja) 2013-02-01 2016-12-14 株式会社マキタ 電動工具
US9630310B2 (en) 2013-02-01 2017-04-25 Makita Corporation Electric tool
JP6059032B2 (ja) 2013-02-01 2017-01-11 株式会社マキタ 電動工具
US9759807B2 (en) * 2013-10-25 2017-09-12 Texas Instruments Incorporated Techniques for angle resolution in radar
USD742081S1 (en) 2014-01-15 2015-10-27 Milwaukee Electric Tool Corporation Dust collector
USD741557S1 (en) 2014-01-15 2015-10-20 Milwaukee Electric Tool Corporation Dust collector
DE102016106782A1 (de) * 2016-04-13 2017-10-19 Festool Gmbh Hand-Werkzeugmaschine mit einer Abdeckeinrichtung
DE102018206869A1 (de) 2018-05-04 2019-11-07 Robert Bosch Gmbh Einfach montierbare Staubabsaugung
JP7100527B2 (ja) * 2018-08-06 2022-07-13 株式会社マキタ カバーおよび工具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030119435A1 (en) * 2001-12-20 2003-06-26 Oliver Ohlendorf Grinding tool with extraction hood
JP2009172696A (ja) * 2008-01-22 2009-08-06 Hitachi Koki Co Ltd 保護カバー
EP2202029A2 (fr) * 2008-12-23 2010-06-30 Flex-Elektrowerkzeuge GmbH Tête de support d'outil pour une machine de nettoyage/affilage manuelle et machine de nettoyage/affilage manuelle
JP2011056641A (ja) 2009-09-14 2011-03-24 Makita Corp ディスクグラインダの集塵カバー

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE507264C2 (sv) * 1996-06-13 1998-05-04 Atlas Copco Tools Ab Handhållet motordrivet verktyg
SE525836C2 (sv) * 2003-03-31 2005-05-10 Atlas Copco Tools Ab Slipmaskin med sprängskydd och spindellåsning
DE10343060A1 (de) * 2003-09-16 2005-04-07 Robert Bosch Gmbh Handwerkzeugmaschine mit Schutzhaube
JP2006007402A (ja) * 2004-06-29 2006-01-12 Goei Seisakusho:Kk 研削装置
CN201015835Y (zh) * 2007-03-15 2008-02-06 苏州宝时得电动工具有限公司 动力工具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030119435A1 (en) * 2001-12-20 2003-06-26 Oliver Ohlendorf Grinding tool with extraction hood
JP2009172696A (ja) * 2008-01-22 2009-08-06 Hitachi Koki Co Ltd 保護カバー
EP2202029A2 (fr) * 2008-12-23 2010-06-30 Flex-Elektrowerkzeuge GmbH Tête de support d'outil pour une machine de nettoyage/affilage manuelle et machine de nettoyage/affilage manuelle
JP2011056641A (ja) 2009-09-14 2011-03-24 Makita Corp ディスクグラインダの集塵カバー

Also Published As

Publication number Publication date
CN102729143A (zh) 2012-10-17
JP2012213820A (ja) 2012-11-08
US20120252328A1 (en) 2012-10-04
RU2012112407A (ru) 2013-10-10

Similar Documents

Publication Publication Date Title
EP2505308A1 (fr) Outil électrique
CN106514467B (zh) 研磨机和罩
CN106514468B (zh) 研磨机、罩和罩组件
JP4962896B2 (ja) 動力工具
CN102554743B (zh) 旋转工具
EP3074177B1 (fr) Ponceuse munie d'un ventilateur en deux parties
US10821571B2 (en) Handheld, hand-guided cutting-off machine
JP6044718B2 (ja) グラインダ
US20180345456A1 (en) Handheld, hand-guided cutting-off machine
US20180281086A1 (en) Handheld, hand-guided cutting-off machine
US10399194B2 (en) Rotary table assembly with cover
US9095950B2 (en) Motor-driven angle grinder
KR101539746B1 (ko) 조준경 알루미늄합금 메인바디 가공품의 절삭분 제거장치
EP2983877B1 (fr) Scie murale pourvue d'un embrayage de sécurité
JP2013184258A (ja) 集塵アダプターおよび集塵アダプターを備えた動力工具
CN215267911U (zh) 手持式电动工具后轴承防尘装置
JP2009023005A (ja) 電動工具
JP6871348B2 (ja) グラインダ及びカバー
CN208289003U (zh) 电主轴的密封结构及电主轴
CN108788197B (zh) Ac双摆角电主轴
CN203197739U (zh) 磨盘固定装置
CN201175845Y (zh) 一种倒角机
JP2012206211A (ja) 集塵アダプターおよび集塵アダプターを備えた動力工具
CN215087655U (zh) 一种具有气密封结构的雷蒙磨磨辊轴
CN108435296A (zh) 一种用于油墨制造的无机颜料研磨装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20130226

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

17Q First examination report despatched

Effective date: 20130403

INTG Intention to grant announced

Effective date: 20130423

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130904