EP2505308A1 - Power tool - Google Patents
Power tool Download PDFInfo
- 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- Withdrawn
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)
- Portable Power Tools In General (AREA)
- Auxiliary Devices For Machine Tools (AREA)
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 (en) | 2012-10-03 |
Family
ID=45808214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12157709A Withdrawn EP2505308A1 (en) | 2011-03-31 | 2012-03-01 | Power tool |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120252328A1 (zh) |
EP (1) | EP2505308A1 (zh) |
JP (1) | JP2012213820A (zh) |
CN (1) | CN102729143A (zh) |
RU (1) | RU2012112407A (zh) |
Families Citing this family (11)
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 |
WO2014005800A1 (en) * | 2012-07-03 | 2014-01-09 | Atlas Copco Industrial Technique Ab | Power tool |
US9630310B2 (en) | 2013-02-01 | 2017-04-25 | Makita Corporation | Electric tool |
JP6043195B2 (ja) * | 2013-02-01 | 2016-12-14 | 株式会社マキタ | 電動工具 |
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 |
USD741557S1 (en) | 2014-01-15 | 2015-10-20 | Milwaukee Electric Tool Corporation | Dust collector |
USD742081S1 (en) | 2014-01-15 | 2015-10-27 | 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)
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 (de) * | 2008-12-23 | 2010-06-30 | Flex-Elektrowerkzeuge GmbH | Werkzeughaltekopf für eine handgehaltene Reinigungs-/Schleifmaschine und handgehaltene Reinigungs-/Schleifmaschine |
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)
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 |
-
2011
- 2011-03-31 JP JP2011079521A patent/JP2012213820A/ja not_active Withdrawn
-
2012
- 2012-02-14 CN CN2012100333392A patent/CN102729143A/zh active Pending
- 2012-02-27 US US13/405,992 patent/US20120252328A1/en not_active Abandoned
- 2012-03-01 EP EP12157709A patent/EP2505308A1/en not_active Withdrawn
- 2012-03-30 RU RU2012112407/02A patent/RU2012112407A/ru unknown
Patent Citations (4)
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 (de) * | 2008-12-23 | 2010-06-30 | Flex-Elektrowerkzeuge GmbH | Werkzeughaltekopf für eine handgehaltene Reinigungs-/Schleifmaschine und handgehaltene Reinigungs-/Schleifmaschine |
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 |
---|---|
US20120252328A1 (en) | 2012-10-04 |
RU2012112407A (ru) | 2013-10-10 |
JP2012213820A (ja) | 2012-11-08 |
CN102729143A (zh) | 2012-10-17 |
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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 |
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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 |
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AX | Request for extension of the european patent |
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17P | Request for examination filed |
Effective date: 20130226 |
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Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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17Q | First examination report despatched |
Effective date: 20130403 |
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INTG | Intention to grant announced |
Effective date: 20130423 |
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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 |
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18D | Application deemed to be withdrawn |
Effective date: 20130904 |