EP0253181B1 - Befestigungseinrichtung für scheibenförmige Werkzeuge an der Werkzeugspindel einer tragbaren Elektrowerkzeugmaschine - Google Patents

Befestigungseinrichtung für scheibenförmige Werkzeuge an der Werkzeugspindel einer tragbaren Elektrowerkzeugmaschine Download PDF

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Publication number
EP0253181B1
EP0253181B1 EP87109270A EP87109270A EP0253181B1 EP 0253181 B1 EP0253181 B1 EP 0253181B1 EP 87109270 A EP87109270 A EP 87109270A EP 87109270 A EP87109270 A EP 87109270A EP 0253181 B1 EP0253181 B1 EP 0253181B1
Authority
EP
European Patent Office
Prior art keywords
tool
spindle
clamping
piston
actuating mechanism
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.)
Expired - Lifetime
Application number
EP87109270A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0253181A2 (de
EP0253181A3 (en
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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 C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP0253181A2 publication Critical patent/EP0253181A2/de
Publication of EP0253181A3 publication Critical patent/EP0253181A3/de
Application granted granted Critical
Publication of EP0253181B1 publication Critical patent/EP0253181B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft

Definitions

  • the invention relates to a device for fastening a disk-shaped tool to the motor-driven tool spindle of a portable power tool of the type specified in the preamble of claim 1.
  • the device is particularly suitable for fastening the grinding wheel to the tool spindle of a portable angle grinder. In the same way, circular saw blades, cutting discs and similar tools can also be attached.
  • a device on an angle grinder of this type is known (DE-C-34 05 885), by means of which the grinding wheels can be assembled and removed by hand using an actuating mechanism integrated in the machine without additional tools.
  • a rotary lever is provided there, which acts on a tension anchor that is axially displaceable in the tool spindle designed as a hollow shaft.
  • the tensioning anchor can be moved against the force of a compression spring in such a way that the flange-like tensioning nut screwed onto its free end is lifted off the grinding wheel and can thus be easily released by hand.
  • the tension anchor is non-rotatably connected to the tool spindle via a toothing. Since the compression spring increases most of the clamping force acting on the grinding wheel has certain minimum dimensions required, so that the known device is particularly suitable for larger angle grinders, especially for two-hand angle grinders.
  • the invention has for its object to further develop the known device for fastening a disk-shaped tool of the type specified in such a way that, due to its more compact design, it is also suitable for smaller portable electric machine tools, in particular for single-handed machines.
  • the invention is based on the idea that when the tool is clamped in, there should be a sufficient frictional connection between the clamping flange, the tool and the counterflange and thus also between the tool spindle and the clamping anchor, while the clamping flange should be relieved to release the tool so that it is unscrewed from the clamping anchor can.
  • these states are made possible by the fact that the tension anchor and the tool spindle delimit a common cavity defining a variable axial distance between facing boundary surfaces of these parts, which cavity is connected to a second cavity arranged in the tension anchor or in the tool spindle and that the cavities are connected to a continuous plastic mass for hydraulic pressure transmission are filled.
  • a piston which can be displaced by changing the cavity volume and locked in the clamping position is arranged.
  • the first cavity is on the hollow shaft by a boundary surface pointing to the side of the actuating mechanism and by a boundary surface opposite this, facing the tool side Spannaker delimits, while the tension anchor has an open to the side of the actuating mechanism, reaching to the second cavity axial bore for receiving the piston.
  • the cavities are expediently connected to one another via essentially radially aligned bores in the tension anchor.
  • the cavity delimitation surface of the tool spindle can be formed by the inner end face of a cylinder sleeve rigidly inserted into the hollow shaft from the tool side, through the axial bore of which the tension anchor engages with a screw pin carrying the tension flange nut at its end, while the tension anchor one of the inner face of the sleeve can have opposite shoulder as a cavity boundary surface.
  • the actuating mechanism has a thrust piece which can be axially displaced in the gear housing and which bears against an axial bearing surface of the piston via a rotary bearing which absorbs axial forces and is preferably designed as a needle bearing .
  • the actuating mechanism has a threaded spindle which is guided in a threaded bore of the tension anchor and which, on its end face facing the second cavity, bears directly with its end face or indirectly via a loose piston against the surface of the plastic mass.
  • the thread of the threaded spindle and the threaded bore is expediently designed to be self-locking.
  • the threaded spindle optionally engages together with the tension anchor on the side opposite the tool through an opening in the gear housing, the threaded spindle on the outside of the gear housing having a preferably knurled actuating head.
  • the threaded spindle with the actuating head has a dual function: by turning the spindle, the piston can be axially displaced in the second cavity, thereby changing the clamping state.
  • plastic mass is pressed from the second cavity into the first cavity and the clamping flange is pulled over the clamping anchor with intermediate clamping of the disk-shaped tool against the abutment on the tool spindle.
  • the spindle in the relaxed state of the tension anchor can be moved against the tool spindle by axial pressure against the spindle head so that the clamping flange is relaxed by increasing the distance to the abutment and can therefore be easily removed from the tension anchor.
  • plastic mass overflows from the first cavity, which becomes smaller as it moves, into the second cavity containing the piston.
  • the actuating end of the threaded spindle which is accessible from the outside, can be covered against accidental access by a cover articulated on the gear housing for safety reasons.
  • the cover has a cover closure, which is preferably designed as a snap-in connection and is only effective or can be latched in when the actuating mechanism is in the tensioned state.
  • a safety switch which can be triggered by the cover or the cover lock can also be provided, which ensures that the machine can only be started when the cover is closed.
  • a compression spring acting counter to the clamping direction can be provided according to the invention in a cavity between the tool spindle and the anchor, which can be designed as a coil spring or a plate spring package.
  • the compression spring is to be designed so that its compressive force is greater than the displacement resistance between the tool spindle and the tension anchor, including the deformation and flow resistances to be overcome during displacement in the area of the plastic mass.
  • toothing grooves are arranged in the piston wall and the associated cavity wall for receiving a part of the plastic mass.
  • plastic mass is best suited for the device according to the invention.
  • the use of all available plastic masses would be possible, provided that these remain permanently plastic.
  • the plastic mass comprises polyvinyl chloride (PVC) with a relatively low degree of polymerization, since this plastic mass largely meets the requirements for portable power tools.
  • the boundary surface assigned to the tension anchor that is to say the part of the boundary surface which points towards the tool side, is at least 50: 1 to a cross-sectional surface of the piston, since such a transmission ratio is at the device according to the invention allows a sufficiently large clamping force for clamping the tool with a still acceptable operating force.
  • the ratio is 100: 1 or even 200: 1 for large portable hand tools.
  • the angle grinder essentially consists of an electric motor arranged in a motor housing 10, an adjoining bevel gear 14 arranged in a gear housing 12 for driving a tool spindle 18 and a grinding wheel 28 which can be fastened to the tool spindle 18 with the aid of a clamping device.
  • the tool spindle 18 designed as a hollow shaft is mounted in two radial roller bearings 16 in the gear housing 12. It has an abutment 20 at its end protruding from the gear housing, against which the grinding wheel 28 can be pressed with the aid of a clamping flange 26.
  • the clamping flange 26, which is designed as a threaded nut, can be screwed onto the threaded pin 24 of a clamping armature 22 which is mounted in the interior of the hollow shaft 18 in a rotationally fixed but displaceable manner in the axial direction.
  • the stub shaft 23 of the tension armature 22 engages through the axial bore 31 of a sleeve 30 inserted from below into the hollow shaft 18 and secured with a snap ring 32 and projects with its threaded pin 24 beyond the flange-side end of the hollow shaft 18.
  • An annular cavity 39 is delimited by the inwardly facing end face 34 of the sleeve 30, the adjoining axial inner surface of the hollow shaft 18 and the shoulder 36 of the tension anchor 22 opposite the sleeve 30, said cavity 39 having radial bores 42 in the tension anchor 22 with a second cavity 44 connected is.
  • a piston 46 engages in the axial bore 45 leading to the second cavity 44, the end face 47 of which delimits the cavity 44. By moving the piston 46 in the axial bore 45 with the aid of an actuating mechanism 54, the volume of the cavity 44 can be changed within certain limits.
  • the cavities 39, 44 are filled with a plastically deformable, essentially incompressible mass 40 which is connected via the bore 42.
  • the mass consists, for example, of PVC with a relatively low degree of polymerization, which in at elevated temperature is filled in liquid state and has a gelatinous plastic consistency at ambient temperature.
  • further chambers 37 open to the cavity 39, for receiving plastic mass 40 can be arranged.
  • the piston 46 In the tensioned position of the actuating mechanism 54, the piston 46 is pushed farthest into the cavity 44. The piston 46 is held by the actuating mechanism in its inserted position, so that a largely rigid connection between the piston 46, the tension anchor 22, the plastic mass 40 and the hollow shaft 18 is created, while the grinding wheel 28 between the clamping flange 26 and the abutment 20 firmly is jammed.
  • the piston 46 like the other parts mentioned, is also rotated about the spindle axis by the driven tool spindle 18.
  • an axial rotary bearing 50 which is preferably designed as a needle bearing, is arranged between the pressure piece 52 and the bearing plate 48 of the piston (FIGS. 1 and 2).
  • the actuating mechanism 54 is released by lifting the eccentric lever 55 (FIG. 1) or by turning the rotary lever 58 (FIG. 2), the pressure piece 52 becomes lifted from the bearing plate 48 of the piston 46. Since the piston 46 can be displaced axially by the play that has now become free, plastic material 40 can be displaced out of the cavity 39 into the cavity 44 by the application of a force acting on the tension anchor 22, and the tension anchor 22 can be shifted downward by a corresponding amount relative to the hollow shaft 18 will.
  • the force can be applied, for example, by an axially acting compression spring 60 designed as a disk spring package, which can be arranged in an annular space 62 between the hollow shaft 18 and the tension anchor 22 (FIG.
  • the clamping flange 26 is lifted off the grinding wheel 28. Since it is no longer necessary to overcome the full contact pressure between the clamping flange 26 and the grinding wheel 28 to loosen the clamping flange 26, the clamping flange nut 26, which is preferably provided with knurling, can easily be unscrewed by hand from the threaded pin 24 and the grinding wheel 28 removed.
  • the grinding wheel 28 is first plugged onto the threaded pin 24 and then moved against the abutment 20 with the clamping flange nut 26 screwed onto the threaded pin 24 by hand.
  • the piston 46 is pushed into the axial bore 45, so that plastic mass 40 is displaced from the cavity 44 into the cavity 39 becomes.
  • the tension anchor 22 is drawn back into the hollow shaft 18, increasing the distance between the boundary surfaces 34, 36 on the side of the threaded pin 24, and the tension flange 26 is pressed against the abutment 20 with the grinding wheel 28 being clamped in between.
  • the direction of rotation of the tool spindle 18 and the thread pitch on the threaded pin 24 are coordinated with one another in such a way that the clamping flange nut 26 automatically tightens when the motor starts.
  • the actuating member is designed as a threaded spindle 46 'which is guided in a threaded bore 45 of the tension anchor 22.
  • the threaded spindle 46 ' engages through an opening 66 provided with a seal 67 in the gear housing 12, while in the case of FIG. 4 the tension anchor 22 is guided outwards through the housing opening 66 together with the threaded spindle 46'.
  • the threaded spindle carries an actuating head 72 which is provided with knurling and which, when the actuating mechanism 54 is in the tensioned state, is overlapped by a hinged cover 68 articulated on the gear housing 12.
  • the hinged lid 68 can only be closed on the lid closure 70 for safety reasons when the actuating spindle 46 'is in the clamping position.
  • the lid closure 70 can have a safety switch, not shown, which interrupts the power supply to the drive motor when the lid is open.
  • the actuating spindle 46 forms with its end face itself the piston 46 acting against the plastic mass 40, while in the exemplary embodiment according to FIG. 4 a loose piston 46 is arranged in the second cavity 44, onto which one the spindle 46 'acts on the end face molded pin 64.
EP87109270A 1986-07-12 1987-06-27 Befestigungseinrichtung für scheibenförmige Werkzeuge an der Werkzeugspindel einer tragbaren Elektrowerkzeugmaschine Expired - Lifetime EP0253181B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863623555 DE3623555A1 (de) 1986-07-12 1986-07-12 Befestigungseinrichtung fuer scheibenfoermige werkzeuge an der werkzeugspindel einer tragbaren elektrowerkzeugmaschine
DE3623555 1986-07-12

Publications (3)

Publication Number Publication Date
EP0253181A2 EP0253181A2 (de) 1988-01-20
EP0253181A3 EP0253181A3 (en) 1990-01-31
EP0253181B1 true EP0253181B1 (de) 1992-09-16

Family

ID=6305045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109270A Expired - Lifetime EP0253181B1 (de) 1986-07-12 1987-06-27 Befestigungseinrichtung für scheibenförmige Werkzeuge an der Werkzeugspindel einer tragbaren Elektrowerkzeugmaschine

Country Status (5)

Country Link
US (1) US4779382A (ko)
EP (1) EP0253181B1 (ko)
JP (1) JPS6389267A (ko)
KR (1) KR900008485B1 (ko)
DE (2) DE3623555A1 (ko)

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EP0324357B1 (de) * 1988-01-09 1993-05-19 C. & E. FEIN GmbH & Co. Einrichtung zum Spannen eines scheibenförmigen Werkzeugs
DE3828954A1 (de) * 1988-08-26 1990-03-08 Licentia Gmbh Einrichtung zur stillstandsbremsung eines mit einem winkelgetriebe ausgeruesteten elektrowerkzeugs
DE3902874A1 (de) * 1989-02-01 1990-08-09 Fein C & E Adapter zum befestigen eines zusatzwerkzeugs
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DE10124971B4 (de) * 2001-05-21 2013-06-20 Hilti Aktiengesellschaft Schnellspanneinrichtung für eine Kreissäge
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DE102010064369B4 (de) * 2010-12-30 2021-12-23 Robert Bosch Gmbh Handwerkzeugmaschinenspannvorrichtung
US9592600B2 (en) 2011-02-23 2017-03-14 Ingersoll-Rand Company Angle impact tools
US8925646B2 (en) 2011-02-23 2015-01-06 Ingersoll-Rand Company Right angle impact tool
DE102011085561A1 (de) * 2011-06-06 2012-12-06 Robert Bosch Gmbh Handwerkzeugmaschinenspannvorrichtung
CN102896619B (zh) * 2011-07-26 2015-04-22 苏州宝时得电动工具有限公司 动力工具及其操作方法
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CN103182707B (zh) * 2011-12-28 2016-03-16 苏州宝时得电动工具有限公司 动力工具
CN103170956B (zh) * 2012-12-29 2015-12-02 南京德朔实业有限公司 附件夹紧机构及带有该附件夹紧机构的动力工具
CN103170955B (zh) * 2012-12-29 2015-11-25 南京德朔实业有限公司 附件夹紧机构及带有该附件夹紧机构的动力工具
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KR101602295B1 (ko) * 2014-12-22 2016-03-10 한전케이피에스 주식회사 그라인더용 다종류 절단 휠 연결장치
CN106312955B (zh) * 2015-06-26 2021-03-16 苏州宝时得电动工具有限公司 手持式工具及其夹紧装置
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CN106041695B (zh) * 2016-08-05 2018-04-20 无锡市天龙装饰材料有限公司 一种便于拆卸的五金加工用打磨轮
EP3300835B1 (en) 2016-09-29 2021-05-12 Black & Decker Inc. Accessory clamp and spindle lock mechanism for power tool lock
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
DE102017212526A1 (de) * 2017-07-20 2019-01-24 Robert Bosch Gmbh Schnellspannvorrichtung für eine tragbare Werkzeugmaschine
CN110944794B (zh) * 2017-08-04 2022-07-12 苏州宝时得电动工具有限公司 打磨工具及其主体部和打磨部
US10870155B2 (en) * 2018-02-10 2020-12-22 Robert Bosch Tool Corporation Oscillating tool accessory holder mechanism
CN109333358A (zh) * 2018-11-30 2019-02-15 天津鑫凯建业科技有限公司 金刚石打磨装置
CN110842718A (zh) * 2019-11-21 2020-02-28 颀谱电子科技(南通)有限公司 一种集成电路板生产的快拆式防放置偏移磨具
CN111791118B (zh) * 2020-07-23 2021-11-16 罗静婷 一种有色金属产品打磨装置

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Also Published As

Publication number Publication date
US4779382A (en) 1988-10-25
EP0253181A2 (de) 1988-01-20
DE3623555C2 (ko) 1988-11-03
KR880001373A (ko) 1988-04-23
KR900008485B1 (ko) 1990-11-22
JPS6389267A (ja) 1988-04-20
DE3623555A1 (de) 1988-02-04
EP0253181A3 (en) 1990-01-31
DE3781733D1 (de) 1992-10-22

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