EP1684943B1 - Dispositif porte-outil - Google Patents

Dispositif porte-outil Download PDF

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Publication number
EP1684943B1
EP1684943B1 EP04786847A EP04786847A EP1684943B1 EP 1684943 B1 EP1684943 B1 EP 1684943B1 EP 04786847 A EP04786847 A EP 04786847A EP 04786847 A EP04786847 A EP 04786847A EP 1684943 B1 EP1684943 B1 EP 1684943B1
Authority
EP
European Patent Office
Prior art keywords
tool holding
holding device
spring
web
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.)
Expired - Fee Related
Application number
EP04786847A
Other languages
German (de)
English (en)
Other versions
EP1684943A1 (fr
Inventor
Ernst Kraenzler
Peter Stierle
Albrecht Hofmann
Juergen Wiker
Harald Krondorfer
Markus Heckmann
Joachim Schadow
Sinisa Andrasic
Thomas Schomisch
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1684943A1 publication Critical patent/EP1684943A1/fr
Application granted granted Critical
Publication of EP1684943B1 publication Critical patent/EP1684943B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • 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
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2585—Tool rest
    • Y10T82/2589—Quick release tool or holder clamp

Definitions

  • a tool receiving device of a hand-held angle grinder for an insert tool with a disc-shaped hub is known.
  • the tool receiving device has a driving device with a leaf spring, by means of which the insert tool can be tensioned in the axial direction.
  • WO 03/097299 A1 (Prior art according to Art.54 (3) EPC) discloses a tool receiving device with a substantially disc-shaped hub for a hand-held angle grinder with a spring element formed by a leaf spring entrainment device with an insert tool in an axial direction (64) can be tensioned.
  • the leaf spring element comprises an at least partially extending in a circumferential direction free spring bar.
  • the invention relates to a tool receiving device for an insert tool with a substantially disc-shaped hub, in particular for a hand-held angle grinder or a circular saw, with a Leaf spring unit comprising driving device with which the insert tool can be tensioned in the axial direction.
  • the leaf spring unit has at least one free spring web extending at least partially in the circumferential direction, a space-saving leaf spring unit with a contour which can be produced easily and with an advantageous force transmission can be achieved cost-effectively.
  • free spring bar should be understood in this context, a spring bar with at least one free end.
  • the spring bar has at its free end a formed by a flat, molded support surface, whereby advantageously a power transmission over a large area and thereby a small surface pressure, a small wear and a long life can be achieved.
  • the spring bar is connected to a retaining ring via at least one at least substantially radially extending, in particular radially inwardly extending connecting web, an advantageous, in particular easily predeterminable, voltage profile can be achieved in the leaf spring unit.
  • the spring bar could also extend substantially without a radial connecting web, for example spirally, outwards and / or inwards.
  • the spring bar can be made of an additional attached to a retaining ring component or can be at least partially integral with a retaining ring, which additional components, assembly costs and costs can be saved.
  • the connecting web and the spring bar are at least substantially T-shaped and / or that the spring bar has a decreasing width towards its free end. It can be an easily predeterminable voltage curve in the leaf spring unit and an advantageous Voltage distribution and consequent advantageous use of material can be achieved.
  • the spring bar has a thickness between 0.7 mm and 1.1 mm, whereby a high spring force can be achieved in an advantageous constellation of material costs and manufacturing costs.
  • the leaf spring unit advantageously has at least one coding means which corresponds with at least one component of the entrainment device during assembly in order to avoid incorrect assembly of the leaf spring unit, whereby incorrect assembly is to be understood as meaning in particular a laterally inverted assembly. Damage caused by incorrect assembly and functional impairment can be avoided.
  • the tool receiving device comprises a drive shaft having at least one machined integrally formed positive locking element for positive connection in the circumferential direction with a means, in particular with a driving flange of the driving device for driving torque transmission.
  • a connection between the drive shaft, the Drive device and the insert tool can be achieved can be transmitted via the high torque, in particular by cost-large transmission surfaces can be achieved without at least significant material weaknesses.
  • the solution according to the invention is thus particularly suitable for machines with high performance, in particular for network machines.
  • the drive shaft can in principle be formed by a motor shaft, an output shaft of a transmission, in particular an angle gear, or by a subsequent to an output shaft of a transmission in the direction of the insert tool shaft.
  • the interlocking element may be formed by an integrally formed groove in which an additional, for example, tooth-like transmission means could be attached, whereby this can be targeted specifically with regard to its material properties on the existing loads, or the interlocking element can advantageously directly for contacting with the means of Drive device can be used, which additional components, assembly costs and costs can be saved.
  • the positive-locking element is formed by a pressing process on the drive shaft, this can advantageously be realized cost-effectively with close tolerances.
  • a pressing process other methods that appear appropriate to a person skilled in the art are also conceivable for machining the positive-locking element without machining on the drive shaft, such as, for example, casting methods, etc.
  • Fig. 1 shows an angle grinder 32 from above with a mounted in a housing 34, not shown electric motor.
  • the angle grinder 32 is integrated over a first, in the housing 34 on a side facing away from an insert tool 14, extending in the longitudinal direction Handle 36 and via a second attached to a transmission housing 38 in the region of the insert tool 14, transversely to the longitudinal direction extending handle 40 feasible.
  • the electric motor via a not-shown angle gear and a drive shaft 16 and a driving device 12 comprehensive tool holding device, the insert tool 14 is driven in rotation (Fig. 2).
  • the drive shaft 16 formed by an output shaft of the bevel gear 16 has at its free end three machined via an extrusion process positive locking elements 100 for positive connection in the circumferential direction 50, 52 with a contact surface 30 for the insert tool 14 forming driving flange 10 for driving torque transmission.
  • an internal thread 140 is introduced into the drive shaft 16, the drive shaft 16 is reworked by turning, case hardened and then ground in certain areas, especially in storage areas.
  • the interlocking elements 100 have a greater length extension 102 in the axial direction 64 of the drive shaft 16 than height 104 and are formed with a rectangular cross-sectional area.
  • the form-fitting elements 100 of the drive shaft 16 engage directly on the driving flange 10 for direct drive torque transmission into the form-fitting elements 106 formed on the inner periphery of the driving flange 10 formed by a sintered part, which are formed by continuous axial grooves (FIGS. 2 and 3).
  • the driving flange 10 is through centered in the radial direction outwardly facing outer surfaces of the interlocking elements 100.
  • the driving flange 10 is supported on a collar 130 of the drive shaft 16 via a spacer element 108 formed by a sleeve.
  • the spacer element 108 covers a production-related transition 132 between a designated by the interlocking elements 100 area at the free end of the drive shaft 16 and an adjacent in the axial direction 64 area.
  • a collar 26 is formed on a side facing the insert tool 14, over which the insert tool 14 is radially centered with its center hole 46 in the mounted state.
  • three mold elements 22 are arranged, which are formed by radially outwardly extending projections.
  • the integrally formed with the collar 26 form elements 22 are distributed uniformly over an outer circumference of the collar 26 and have in the axial direction 54, 64 a distance 28 to the contact surface 30. With its end facing the insert tool 14, the collar 26 projects beyond the shaped elements 22 in the axial direction 54.
  • a metal plate 48 On a side facing away from the insert tool 14 of the driving flange 10 is a metal plate 48 with three circumferentially 50, 52 evenly distributed, integrally formed, extending in the axial direction 54 clamping hooks 56 for axially fixing the insert tool 14.
  • the clamping hooks 56 are formed in a bending operation on the metal plate 48.
  • the driving flange 10 When mounting the driving device 12, the driving flange 10, a leaf spring unit 58 and the metal plate 48 are pre-assembled.
  • the leaf spring unit 58 is pushed onto a collar of the driving flange 10, which faces away from the insert tool 14 direction.
  • the clamping hooks 56 of the sheet-metal plate 48 which at its free end have a hook-shaped extension with an oblique surface 94 pointing in the circumferential direction 52, are guided in the axial direction 54 through recesses 60 of the driving flange 10 (FIGS. 2 and 3).
  • the leaf spring unit 58 By compressing and rotating the metal plate 48 and the driving flange 10 against each other, the leaf spring unit 58 is biased and the metal plate 48 and the driving flange 10 are positively connected in the axial direction 54, 64 (FIGS. 2 and 3).
  • the metal plate 48 is then, loaded by the leaf spring unit 58, supported on the contact surface 30 of the driving flange 10 over edges of the hook-shaped extensions, which point axially in the direction away from the insert tool 14 direction.
  • the leaf spring unit 58 has three identical, in the circumferential direction 50, 52 extending free spring bars 110, which are each formed via a radially inwardly extending connecting web 112 integral with a retaining ring 114 (Fig. 4).
  • the connecting web 112 and the spring bar 110 are formed substantially T-shaped, wherein the spring bar 110 is arcuately formed with two free ends and the connecting web 112 in the middle of the spring bar 110 connects to the same.
  • the spring bar 110 has a decreasing width 120 towards its free ends 116, 118 and has a thickness 126 of approximately 0.9 mm.
  • the leaf spring unit 58 rests with its retaining ring 114 on the driving flange 10, wherein the spring bars 110 are each bent starting from the connecting web 112 in the direction of their free ends 116, 118 in the direction away from the driving flange 10 and are supported on the tabs 68 of the metal plate 48.
  • integrally formed bearing surfaces 122, 124 are formed on the free ends 116, 118 of flats or the free ends 116, 118 of the spring bars 110 in the direction of the driving flange 10 is slightly bent:
  • radially outwardly extending coding means 128 are formed on the outer circumference of the retaining ring 114 next to the connecting webs 112, which correspond with the clamping hooks 56 and bolts 20 of the driving device 12 during assembly. If the leaf spring unit 58 mounted laterally reversed, while the metal plate 48 can be performed in a twisted position with their clamping hooks 56 through recesses of the leaf spring unit 58, but then a drive plate 96 with its bolts 20 due to the coding means 128 are no longer passed through the leaf spring unit 58 ,
  • the leaf spring unit 58 and the driving flange 10 are pre-assembled, is formed by a helical compression spring element 18 and the drive plate 96 with its three evenly distributed over the circumference, extending in the axial direction 54 bolt 20 the drive shaft 16 attached (Fig. 2).
  • the preassembled assembly consisting of the metal plate 48, the leaf spring unit 58 and the driving flange 10, mounted on the drive shaft 16.
  • the bolts 20 are guided during assembly by integrally formed on the circumference of the metal plate 48 tabs 68, the holes 70, and located in the driving flange 10 through holes 72 and engage in the assembled state through the through holes 72.
  • the interlocking elements 100 on the drive shaft 16 are in introduced the positive locking elements 106 of the driving flange 10.
  • radially inwardly extending formations 134 are introduced into grooves 136 introduced on the outer circumference of the drive flange 10.
  • the metal plate 48 and the drive plate 96 are secured to each other via the bolts 20 against rotation.
  • the driving device 12 is secured to the drive shaft 16 with a screw 74.
  • the insertion tool 14 formed by a cutting disk has a substantially disk-shaped sheet metal hub 42 formed by a separate component, which has three uniformly distributed, cup-shaped recesses 76 extending in the axial direction 54 in the circumferential direction 50, 52, whose diameters are slightly larger than The diameter of the bolts 20. Further, the sheet metal hub 42 has three evenly distributed in the circumferential direction 50, 52, extending in the circumferential direction 50, 52 recesses 78, each having a narrow and a wide range 80, 82.
  • the diameter of the centering bore 46 of the sheet metal hub 42 is selected so that the insert tool 14 also with a conventional clamping system with a clamping flange and a spindle nut can be clamped on a conventional angle grinder. It ensures a so-called backward compatibility.
  • the sheet metal hub 42 of the insertion tool 14 has three mold elements 24 which are distributed in the circumferential direction 50, 52 uniformly over the circumference of the centering bore 46 (FIG. 2).
  • the mold elements 24 are formed here by recesses.
  • the mold elements 22 of the tool receiving device and the mold elements 24 of the insert tool 14 are matched, corresponding mold elements to facilitate installation of the insert tool 14. Furthermore, the corresponding mold elements 22, 24 form a coding means for avoiding assembly of an impermissible insert tool of the same kind Formed elements 22, 24 with respect to a diameter of the insert tool 14 matched to each other, so that use tools for use in high speed machines have a wide shape element or a wide coding and insert tools for use in low-speed machines a narrow form element or a narrow Encoding.
  • the sheet metal hub 42 of the insert tool 14 is connected via a rivet connection firmly with an abrasive and pressed and is executed by a pointing in the axial direction 64 44 formation cup-shaped.
  • the insert tool 14 When mounting the insert tool 14, the insert tool 14 with its center hole 46 on the mold elements 22 in the axial direction 54 superior part of Bunds 26 postponed and radially precentered.
  • the insert tool 14 comes here to contact surfaces 84 of the mold elements 22 to lie. Twisting the insert tool 14 in the circumferential direction 50, 52 brings the mold elements 22, 24 to cover.
  • the insert tool 14 or the sheet metal hub 42 can then slide in the axial direction 64 in the direction of the contact surface 30, and the sheet metal hub 42 comes to rest on the bolt 20.
  • a subsequent pressing of the sheet metal hub 42 to the contact surface 30 of the driving flange 10 causes the bolts 20 are axially displaced in the through holes 72 and the drive plate 96 against the spring force of the spring member 18 on the drive shaft 16 in the direction away from the insert tool 14 64th
  • radially outwardly directed formations 86 of the driver disk 96 engage in corresponding locking pockets 88 of a bearing flange 90 fixedly connected to the transmission housing 38 and lock the drive shaft 16.
  • the sheet metal hub 42 can be rotated counter to a drive direction 98.
  • the rotation of the sheet metal hub 42 causes the sheet metal hub 42 with its edge of the centering bore 46 in the distance 28 between the mold elements 22 and the Slide contact surface 30 of the driving flange 10 and can be secured by the mold members 22 in the axial direction against falling down.
  • the rotation of the sheet metal hub 42 causes the hook-shaped extensions to be displaced into the arcuate, narrow regions 80 of the recesses 78 of the sheet metal hub 42.
  • the metal plate 48 is moved by the clamping hooks 56 by non-illustrated inclined surfaces axially against the pressure of the leaf spring unit 58 in the direction 54 until bearing surfaces of the hook-shaped projections in the arcuate, narrow areas 80 laterally adjacent to the recesses 78 of the sheet metal hub 42 come to rest.
  • arcuate grooves 138 are introduced into the contact surface 30 of the driving flange 10, via which undesired particles lying on the bearing surface 30 can be conveyed out of the driving device 12:
  • a release button 92 is pressed in the axial direction 64.
  • the release button 92 pushes the drive plate 96 in the axial direction 64, and the formations 86 of the drive plate 96 come with the lock pockets 88 into engagement.
  • the drive shaft 16 is locked.
  • the bolts 20 are in this case with the recesses 76 of the sheet metal hub 42 disengaged, and the sheet metal hub 42 can be rotated in the circumferential direction 52 until the clamping hooks 56 can slide through the recesses 78.
  • the mold elements 22, 24 in this case reach into a corresponding position, and the sheet metal hub 42 can be removed in the axial direction 54.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (10)

  1. Dispositif porte-outil pour un outil amovible (14) comportant un moyeu (42) pratiquement en forme de disque, notamment pour une meuleuse d'angle portative (32) ou une scie circulaire portative, comportant un dispositif d'entraînement (12) ayant une unité à ressorts-lames (58), qui permet de serrer l'outil amovible (14) dans la direction axiale (64), l'unité à ressorts-lames (58) ayant au moins une branche élastique (110) libre, s'étendant au moins en partie dans la direction périphérique (50, 52), cette branche ayant au moins une extrémité libre (116, 118) et la branche élastique (110) présente à son extrémité libre (116, 118) une surface d'appui (122, 124) mise en forme, constituée par une partie aplatie.
  2. Dispositif porte-outil selon la revendication 1,
    caractérisé en ce que
    la branche élastique (110) est reliée à une bague de fixation (114) par au moins une branche de raccordement (112) dirigée pratiquement dans la direction radiale.
  3. Dispositif porte-outil selon la revendication 1 ou 2,
    caractérisé en ce que
    la branche élastique (110) est au moins en partie réalisée avec une bague de fixation (114).
  4. Dispositif porte-outil selon la revendication 2 ou 3,
    caractérisé en ce que
    la branche de raccordement (112) et la branche élastique (110) ont au moins pratiquement une forme de T.
  5. Dispositif porte-outil selon l'une des revendications précédentes,
    caractérisé en ce que
    la branche élastique (110) présente une largeur (120) qui diminue en direction de son extrémité libre (116, 118).
  6. Dispositif porte-outil selon l'une des revendications précédentes,
    caractérisé en ce que
    la branche élastique (110) a une épaisseur (126) comprise entre 0,7 mm et 1,1 mm.
  7. Dispositif porte-outil selon l'une des revendications précédentes,
    caractérisé en ce que
    l'unité à ressorts-lames (58) comporte au moins un moyen de codage (128) qui, au montage, correspond à au moins un composant (20, 56) du dispositif d'entraînement (12) pour éviter un mauvais montage de l'unité de ressorts-lames (58).
  8. Dispositif porte-outil selon l'une des revendications précédentes,
    caractérisé par
    un arbre d'entraînement (16) comportant au moins un élément de liaison par la forme (100), réalisé par un formage sans enlèvement de copeaux, pour la liaison par la forme dans la direction périphérique (50, 52) avec un moyen du dispositif d'entraînement (12) pour transmettre le couple d'entraînement.
  9. Meuleuse d'angle comportant un dispositif porte-outil selon l'une des revendications précédentes.
  10. Scie circulaire portative comportant un dispositif porte-outil selon l'une des revendications précédentes.
EP04786847A 2003-11-08 2004-09-24 Dispositif porte-outil Expired - Fee Related EP1684943B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10352288A DE10352288A1 (de) 2003-11-08 2003-11-08 Werkzeugaufnahmevorrichtung
PCT/DE2004/002131 WO2005049271A1 (fr) 2003-11-08 2004-09-24 Dispositif porte-outil

Publications (2)

Publication Number Publication Date
EP1684943A1 EP1684943A1 (fr) 2006-08-02
EP1684943B1 true EP1684943B1 (fr) 2008-01-23

Family

ID=34559513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04786847A Expired - Fee Related EP1684943B1 (fr) 2003-11-08 2004-09-24 Dispositif porte-outil

Country Status (5)

Country Link
US (1) US7739932B2 (fr)
EP (1) EP1684943B1 (fr)
CN (1) CN100563925C (fr)
DE (2) DE10352288A1 (fr)
WO (1) WO2005049271A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9283655B2 (en) * 2013-09-27 2016-03-15 Mike Olari Liquid diffuser adapter for center fed wet stone fabrication machine
JP6425912B2 (ja) * 2014-05-09 2018-11-21 株式会社マキタ 電動工具
EP3202533A1 (fr) * 2016-02-02 2017-08-09 HILTI Aktiengesellschaft Dispositif de serrage
EP3500402B1 (fr) * 2016-08-22 2021-07-28 Robert Bosch GmbH Dispositif de serrage rapide pour une machine-outil portative, en particulier pour une meuleuse d'angle
CN108500839B (zh) * 2018-03-02 2020-05-22 陈中友 一种用于建筑装修的打磨机

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270467A (en) * 1963-07-01 1966-09-06 Merit Products Inc Abrasive device
DE1577422A1 (de) * 1963-11-26 1970-04-09 Mac Kay Jun Joseph Hartley Schleifkoerperhalterung mit Verriegelungsvorrichtung fuer den eingespannten Schleifkoerper
US4919023A (en) * 1988-03-22 1990-04-24 Bloink Harry W Quick-change tool adapter
US5054344A (en) * 1990-02-01 1991-10-08 Kennametal Inc. Quick change clamping mechanism
GB2289742B (en) * 1994-05-27 1998-12-09 Western Atlas Uk Ltd Drive transmitting device
GB0026051D0 (en) * 2000-10-25 2000-12-13 Universal Drilling And Cutting Arbor
DE10136459A1 (de) 2001-07-26 2003-02-13 Bosch Gmbh Robert System mit einer Werkzeugaufnahme
DE10222292A1 (de) * 2002-05-18 2003-12-04 Bosch Gmbh Robert System mit einer Werkzeugaufnahme
DE10326928B4 (de) * 2003-06-16 2009-07-02 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Schnittstelle zwischen zwei Teilelementen eines Werkzeugsystems

Also Published As

Publication number Publication date
US7739932B2 (en) 2010-06-22
CN100563925C (zh) 2009-12-02
CN1874873A (zh) 2006-12-06
WO2005049271A1 (fr) 2005-06-02
EP1684943A1 (fr) 2006-08-02
DE502004006074D1 (de) 2008-03-13
US20070272064A1 (en) 2007-11-29
DE10352288A1 (de) 2005-06-09

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