EP0244203A2 - Outil motorisé portatif - Google Patents

Outil motorisé portatif Download PDF

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Publication number
EP0244203A2
EP0244203A2 EP87303751A EP87303751A EP0244203A2 EP 0244203 A2 EP0244203 A2 EP 0244203A2 EP 87303751 A EP87303751 A EP 87303751A EP 87303751 A EP87303751 A EP 87303751A EP 0244203 A2 EP0244203 A2 EP 0244203A2
Authority
EP
European Patent Office
Prior art keywords
plunger
rotating part
spindle
barrier means
power tool
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Withdrawn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
EP87303751A
Other languages
German (de)
English (en)
Other versions
EP0244203A3 (fr
Inventor
Leslie Walter Ford
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.)
Kango Ltd
Original Assignee
Kango Ltd
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 Kango Ltd filed Critical Kango Ltd
Publication of EP0244203A2 publication Critical patent/EP0244203A2/fr
Publication of EP0244203A3 publication Critical patent/EP0244203A3/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Withdrawn legal-status Critical Current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
    • B24B23/022—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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • This invention relates to rotary power tools and is concerned with safety devices therefor.
  • a power tool having a housing and comprising drive means including a spindle which is driven in rotation and one end of which protrudes from the housing and is formed with a screw thread for attachment of a tool element to the spindle, a spring-loaded plunger depressible from outside the housing against the force of the spring to engage, when the drive means is stationary, a recess or one of a plurality of recesses formed in a first rotating part of the drive means thereby to lock the spindle against rotation, characterised in that barrier means is provided between the plunger and said rotating part which barrier means is mounted for limited lost motion relative to said rotating part about the axis of rotation of said rotating part into first and second positions respectively obstructing and permitting engagement of the plunger with said recess or recesses, and in that a device is provided for causing the barrier means to take up said first position such that the plunger cannot be engaged with said recess or any of them while the spindle is rotating in its drive direction.
  • said barrier means provides a number of abutments which number is equal to the number of said recesses, each of which abutments being engageable by a side face of the plunger to move the barrier means into said second position when the spindle is rotated in a reverse direction whereby the plunger can then be engaged in said recess or one of them.
  • the barrier means is formed with an aperture or apertures arranged correspondingly to the recess or recesses in the first rotating part and said device comprises adjacent the aperture or each aperture a cam surface on the barrier means the or each cam surface being adapted to deflect the plunger lengthwise of itself away from said rotating part and at the same time to urge the barrier means into said first position
  • a power angle grinder 10 having a housing 11 and a driven grinding disc 12.
  • a motor (not shown) having an output shaft 13 on the free end of which is secured a bevel pinion 14.
  • the bevel pinion 14 meshes with a bevel gear 15 which is fixed to a spindle 16 mounted in bearings 18 in the housing.
  • One end of the spindle 16 projects from the housing 11 and is formed with a screw-threaded portion 19 for engagement by a retaining nut 20 whi-ch serves to secure the grinding disc 12 on the spindle 16. Rotation of the motor thus drives the grinding disc 12, which rotates in the direction of arrow 17.
  • Bevel gear 15 is formed with two axial, diametrically oppositely disposed recesses in the form of through bores 21.
  • a locking plunger 23 is mounted in a bore 26 in the housing 11 which bore 26 has a lengthwise axis aligned with the pitch circle of bores 21.
  • the plunger 23 is loaded by a spring 24 into a position away from the bevel gear 15. The plunger can however be manually depressed against the force of the spring 24 to project into one or other of the bores 21.
  • An annular barrier plate 27 having a central hub 25 is disposed about the spindle 16 in a position axially between the plunger 23 and the bevel gear 15.
  • a set of disc springs 36 backed by a circlip 35 engaged in a groove in the spindle urge the plate into engagement with the bevel gear 15.
  • a pin 34 projects axially from the bevel gear 15 and engages in a slot 33 formed as an extension of a central hole 28 in the hub of the barrier plate 27, the circumferential extent of slot 33 allowing a predetermined degree of rotational lost motion between the barrier plate 27 and the bevel gear 15/spindle 16 assembly.
  • the barrier plate 27 is formed with two diametrically oppositely disposed slots 29 for cooperation with the through bores 21 of the bevel gear 15 as shown in Figure 3B.
  • the material at the leading edge 31 of each of the slots is inclined axially towards the plunger 23.
  • plunger 23 If during use of the tool, plunger 23 is accidentally depressed while bevel gear 15 is spinning, the plunger strikes the inclined edge portion of one or other of the slots 29 of the barrier plate 27. This engagement causes the barrier plate to rotate relative to the bevel gear 15 to take up the lost motion and to move the barrier plate into apposition in which it blanks off the bores 21 in the bevel gear as shown in Figure 3A. The plunger then rides over the upturned edge portions and continues to do so, the up-turned edge portions 31 acting as cams, until either the plunger is released by the operator or the tool stops. The plunger 23 cannot therefore be depressed into engagement with either of the through-bores 21, during operation of the grinder.
  • the plunger When the grinder is stationary and it is desired to remove the disc 12, the plunger is depressed and the grinding disc 12 is rotated by hand in the opposite direction to arrow 17 so that the edge face of one of the upturned edge portions 31 comes into abutment with the depressed plunger 23. Further reverse rotation of the disc causes the plunger to rotate the barrier plate 27 to take up the lost motion thereof relative to bevel gear 15 to move the slots 29 into register with the through bores 21 as shown in Figure 3B. The plunger can then be depressed into the aligned bore 21 to lock the spindle against rotation. The retaining nut 20 can then be unscrewed in the conventional manner in order to remove the grinding disc 12.
  • the spindle 16 is formed with two oppositely disposed radial recesses 50 and a spring-loaded plunger 52 is arranged so as to be capable of being depressed radially into one or other of said recesses.
  • the barrier member is in the form of a cylindrical sleeve 53 which coaxially surrounds a length of the spindle 16.
  • One end of the sleeve 53 is formed with a circumferentially extending slot 58 into which a pin 59 fixed to the spindle projects in order to render the sleeve capable of a predetermined degree of rotational lost motion with respect to the spindle.
  • the other end of the sleeve 53 is formed with two oppositely disposed slots 55 the material at the leading edge 54 of each of_ which is inclined radially outward.
  • the lost motion allows the sleeve to rotate relative to the spindle into first and second positions in which the sleeve respectively obstructs and permits engagement of the plunger in recesses 50.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP87303751A 1986-04-29 1987-04-28 Outil motorisé portatif Withdrawn EP0244203A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8610431 1986-04-29
GB868610431A GB8610431D0 (en) 1986-04-29 1986-04-29 Rotary power tools

Publications (2)

Publication Number Publication Date
EP0244203A2 true EP0244203A2 (fr) 1987-11-04
EP0244203A3 EP0244203A3 (fr) 1989-07-12

Family

ID=10597021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87303751A Withdrawn EP0244203A3 (fr) 1986-04-29 1987-04-28 Outil motorisé portatif

Country Status (2)

Country Link
EP (1) EP0244203A3 (fr)
GB (1) GB8610431D0 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998024589A1 (fr) * 1996-12-05 1998-06-11 Robert Bosch Gmbh Machine-outil a commande manuelle
GB2322324A (en) * 1997-02-20 1998-08-26 Scintilla Ag Hand machine tool with spindle locking device
GB2331945A (en) * 1997-12-02 1999-06-09 Scintilla Ag Spindle brake
EP0982103A1 (fr) * 1998-08-28 2000-03-01 CEKA ELEKTROWERKZEUGE AG + Co.KG Dispositif de verrouillage automatique pour une broche
US6244798B1 (en) 1997-11-05 2001-06-12 Pmv D.O.O. Drill or milling head
WO2009033849A1 (fr) * 2007-09-07 2009-03-19 Robert Bosch Gmbh Machine-outil manuelle à blocage de la broche
US7988538B2 (en) 2006-10-13 2011-08-02 Black & Decker Inc. Large angle grinder
WO2012083749A1 (fr) * 2010-12-24 2012-06-28 铁鎯电动工具有限公司 Meuleuse à double roue et polissoir à double roue
CN103862338A (zh) * 2012-12-12 2014-06-18 苏州宝时得电动工具有限公司 具有推杆式止动机构的角磨机
CN109909831A (zh) * 2017-12-12 2019-06-21 南京德朔实业有限公司 一种角磨机
US10792834B2 (en) 2017-06-05 2020-10-06 Milwaukee Electric Tool Corporation Table saw

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872951A (en) * 1973-11-06 1975-03-25 Black & Decker Mfg Co Spindle locking mechanism for rotary power device
DE2926469A1 (de) * 1979-06-30 1981-01-22 Licentia Gmbh Anordnung zum arretieren der antriebsspindel von elektrowerkzeugen
DE3001907A1 (de) * 1980-01-19 1981-07-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum arretieren der antriebsspindel von elektrowerkzeugen
DE3018775A1 (de) * 1980-05-16 1981-11-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum arretieren der antriebsspindel von winkelschleifern
DE3120899A1 (de) * 1981-05-26 1982-12-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arretiervorrichtung fuer die antriebsspindel von winkelschleifern
DE3120871A1 (de) * 1981-05-26 1982-12-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arretiervorrichtung fuer die antriebsspindel von winkelschleifern oder dgl. elektrowerkzeuge
DE3234254A1 (de) * 1981-09-23 1983-04-07 Milwaukee Electric Tool Corp., 53005 Brookfield, Wis. Motorisch betriebenes werkzeug
EP0129348A2 (fr) * 1983-06-17 1984-12-27 Black & Decker Inc. Mécanisme de blocage pour machine rotative à moteur

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872951A (en) * 1973-11-06 1975-03-25 Black & Decker Mfg Co Spindle locking mechanism for rotary power device
DE2926469A1 (de) * 1979-06-30 1981-01-22 Licentia Gmbh Anordnung zum arretieren der antriebsspindel von elektrowerkzeugen
DE3001907A1 (de) * 1980-01-19 1981-07-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum arretieren der antriebsspindel von elektrowerkzeugen
DE3018775A1 (de) * 1980-05-16 1981-11-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum arretieren der antriebsspindel von winkelschleifern
DE3120899A1 (de) * 1981-05-26 1982-12-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arretiervorrichtung fuer die antriebsspindel von winkelschleifern
DE3120871A1 (de) * 1981-05-26 1982-12-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arretiervorrichtung fuer die antriebsspindel von winkelschleifern oder dgl. elektrowerkzeuge
DE3234254A1 (de) * 1981-09-23 1983-04-07 Milwaukee Electric Tool Corp., 53005 Brookfield, Wis. Motorisch betriebenes werkzeug
EP0129348A2 (fr) * 1983-06-17 1984-12-27 Black & Decker Inc. Mécanisme de blocage pour machine rotative à moteur

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998024589A1 (fr) * 1996-12-05 1998-06-11 Robert Bosch Gmbh Machine-outil a commande manuelle
GB2322324A (en) * 1997-02-20 1998-08-26 Scintilla Ag Hand machine tool with spindle locking device
GB2322324B (en) * 1997-02-20 1999-01-06 Scintilla Ag Hand machine tool with spindle locking mechanism
US6244798B1 (en) 1997-11-05 2001-06-12 Pmv D.O.O. Drill or milling head
GB2331945A (en) * 1997-12-02 1999-06-09 Scintilla Ag Spindle brake
GB2331945B (en) * 1997-12-02 2000-07-05 Scintilla Ag Device for arresting a shaft
CN1103658C (zh) * 1997-12-02 2003-03-26 星蒂拉公开股份有限公司 轴的制动装置
EP0982103A1 (fr) * 1998-08-28 2000-03-01 CEKA ELEKTROWERKZEUGE AG + Co.KG Dispositif de verrouillage automatique pour une broche
US6213695B1 (en) 1998-08-28 2001-04-10 Ceka Elektrowerkzeuge Ag & Co. Kg Automatic spindle arresting device
US7988538B2 (en) 2006-10-13 2011-08-02 Black & Decker Inc. Large angle grinder
US8388417B2 (en) 2006-10-13 2013-03-05 Black & Decker Inc. Large angle grinder
WO2009033849A1 (fr) * 2007-09-07 2009-03-19 Robert Bosch Gmbh Machine-outil manuelle à blocage de la broche
WO2012083749A1 (fr) * 2010-12-24 2012-06-28 铁鎯电动工具有限公司 Meuleuse à double roue et polissoir à double roue
CN103862338A (zh) * 2012-12-12 2014-06-18 苏州宝时得电动工具有限公司 具有推杆式止动机构的角磨机
CN103862338B (zh) * 2012-12-12 2016-08-17 苏州宝时得电动工具有限公司 具有推杆式止动机构的角磨机
US10792834B2 (en) 2017-06-05 2020-10-06 Milwaukee Electric Tool Corporation Table saw
US11407142B2 (en) 2017-06-05 2022-08-09 Milwaukee Electric Tool Corporation Table saw
CN109909831A (zh) * 2017-12-12 2019-06-21 南京德朔实业有限公司 一种角磨机

Also Published As

Publication number Publication date
EP0244203A3 (fr) 1989-07-12
GB8610431D0 (en) 1986-06-04

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Inventor name: FORD, LESLIE WALTER