EP0334864B1 - Dispositif de serrage pour bloquer un outil, un disque en particulier, suivant une direction axiale - Google Patents

Dispositif de serrage pour bloquer un outil, un disque en particulier, suivant une direction axiale Download PDF

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Publication number
EP0334864B1
EP0334864B1 EP87907667A EP87907667A EP0334864B1 EP 0334864 B1 EP0334864 B1 EP 0334864B1 EP 87907667 A EP87907667 A EP 87907667A EP 87907667 A EP87907667 A EP 87907667A EP 0334864 B1 EP0334864 B1 EP 0334864B1
Authority
EP
European Patent Office
Prior art keywords
clamping
tool
fork
nut
fixture according
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
EP87907667A
Other languages
German (de)
English (en)
Other versions
EP0334864A1 (fr
Inventor
Manfred Stäbler
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
Priority to AT87907667T priority Critical patent/ATE85257T1/de
Publication of EP0334864A1 publication Critical patent/EP0334864A1/fr
Application granted granted Critical
Publication of EP0334864B1 publication Critical patent/EP0334864B1/fr
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
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • the invention relates to a clamping device for axially clamping a tool, in particular a disk, according to the generic preamble of the main claim.
  • Clamping devices of this type are particularly suitable for portable hand-held machine tools and, in particular, for grinding machines.
  • a tensioning device of the type mentioned is known (DE-PS 30 12 836), in which the tensioning element consists of an element which is approximately hat-shaped in cross section and is axially supported by a helical spring against the flange of the tensioning nut.
  • the hat-shaped clamping element When the clamping nut is screwed on and tightened, the hat-shaped clamping element is pressed axially against the tool via the axially compressed spring, thereby tightening the tool against the spindle-side flange, the end face of a cylinder shoulder of the clamping nut coming directly into contact with a facing axial side of the spindle-side flange and when further tightening the clamping nut, the spindle-side flange is tightened together with the clamping nut.
  • the aim of this is to achieve the grinding wheel with an angle grinder clamp the defined contact pressure and ensure this contact pressure.
  • This clamping device is also intended to enable the grinding wheel to be replaced quickly and easily and at the same time to avoid overloading the hand-held power tool, in particular the angle grinder.
  • the clamping nut can still be conventional, for example in accordance with standards, so that a key can still be attached for particularly stubborn cases, for example with a rusting clamping nut, and the clamping nut can be loosened with this auxiliary tool.
  • Fig. 1 the lower part of a e.g. Shown as an angle grinder, portable hand-held power tool, which has a motor-driven spindle 10, which at the end merges via an annular shoulder 11 into a cylindrical shoulder 12 of smaller diameter and then into an end threaded shoulder 13 with an external thread 14.
  • the spindle 10 serves to drive a tool 15 which e.g. from the indicated grinding wheel or another tool disc, a rubber plate or the like.
  • the tool 15 is clamped and clamped between a flange 16 and a clamping nut 17.
  • the flange 16 is axially supported on the annular shoulder 11 and centered radially on the cylindrical shoulder 12. It is positively coupled to the spindle 10.
  • the clamping nut 17 has a flange 18 and a cylindrical sleeve part 19 extending therefrom and is provided with a continuous internal thread 20 with which the clamping nut 17 is screwed onto the external thread 14 of the threaded shoulder 13.
  • the tool 15 is centered on the outer circumferential surface of the cylinder sleeve part 19 during fastening.
  • a clamping member 21 is arranged, which here consists of a clamping fork 22.
  • the clamping fork 22 has two curved fork legs 23, 24, which together form an approximately semicircular curved part, from which a handling nose 25 strives.
  • Fig. 1 only the ends 26 and 27 of both fork legs 23, 24 are visible.
  • This clamping member 21 can be acted upon by the clamping nut 17 with an axially directed compressive force and is able to press axially against the tool 15 and to press it against the axial end face of the flange 16.
  • the clamping member 21 in the form of the special clamping fork 22 is held movably relative to the clamping nut 17 between a clamping position shown in FIG. 1 and a release position, not shown.
  • Each end 26, 27 of the fork leg 23, 24 has an axially directed pressure surface 28 and 29, respectively, which drops axially in the direction of movement from the clamping position (FIG. 1) to the release position.
  • the tensioning member 21 in the form of the tensioning fork 22 is held on the tensioning nut 17 such that it can pivot about a preferably diametrical pivot axis 30 by means of bearing pins 31 or 32.
  • the respective pressure surface 28 or 29 is eccentric with respect to the pivot axis 30. If the clamping fork 22 is in its clamping position according to FIG. 1, which corresponds approximately to the horizontal pivot position according to FIG. 3, the part of the pressure surface 28 or 29 with the greatest eccentricity e max, based on the pivot axis 30, is effective.
  • the respective pressure surface 28, 29 has a flattening 34 or 35 (FIG. 3), for example in the area of greatest eccentricity e max, or instead a surface part with already reduced eccentricity. This ensures a stable clamping position about the pivot axis 30 when the clamping fork 22 is in the clamping position according to FIGS. 1 and 3.
  • the clamping nut 17 can act axially directly on the tool 15 with the pressure surfaces 28, 29 of the clamping fork 22.
  • a better pressure distribution in the circumferential direction is achieved if an intermediate member in the form of a thrust washer 36 is arranged between the tool 15 and the pressure surfaces 28, 29, which in turn is acted upon by the eccentric pressure surfaces 28, 29 and has an end face axially against the tool 15 presses.
  • the thrust washer 36 is also centered on the cylinder sleeve part 19 of the clamping nut 17 and is axially movable.
  • Openings 38 and 39 are contained in the flange 18 along the pivot axis 30 and diametrically opposite one another, in which at least the ends 26 and 27 of the fork legs 23 and 24 are received. If the ends 26, 27 of each fork leg 23 or 24 are bent correspondingly far away from it, the clamping fork 22 can be in the clamping position according to FIGS. 1, 3 on the end face 40 pointing downward in FIG.
  • FIGS. 2 and 4 Another advantageous embodiment results from FIGS. 2 and 4.
  • depressions 41, 42 are contained, which are dimensioned so wide and deep that, when the clamping fork 22 is in the clamping position, the two curved fork legs 23, 24 find place in the recess 41 and their handling lug 25 in the recess 42 so that the clamping fork 22 does not project axially beyond the lower end face 40 of the clamping nut 17.
  • Fig. 1 shows the clamping device in the clamping position, in which the tool 15 is clamped axially on the flange 16 via the clamping nut 17 with a clamping fork 22 and via the thrust washer 36.
  • the clamping fork 22 is first pivoted downward about the pivot axis 30 in FIGS. 1 and 3 by engaging the handling nose 25 in the direction of the arrow 33.
  • the pressure surface 28, 29 slides along the facing end surface of the pressure plate 36, the surface area of greatest eccentricity e max being swung away and a surface area with a decreasing eccentricity depending on the swivel angle reaching up to e min in this area.
  • This has the consequence that the internal thread 20 and external thread 14 are relaxed and thus the axial clamping force acting on the tool 15 from the clamping nut 17 is reduced so far that afterwards the clamping nut 17 can be completely unscrewed from the threaded shoulder 13 by hand.
  • the tendon 21, which is now pivoted into the release position, can facilitate the unscrewing movement by touching it to unscrew it.
  • the procedure is as follows. First, the flange 16 is pushed onto the spindle 10. Then the new tool 15 is inserted together with the pressure plate 36 and then the clamping nut 17 is placed and screwed onto the threaded shoulder 13. Your cylinder sleeve part 19 passes through the tool 15 and the thrust washer 36, which are centered thereon.
  • the clamping nut 17 is screwed on, the clamping fork 22 is pivoted into its clamping position according to FIGS. 1, 3, in which it is kept stable due to the flats 34, 35.
  • the clamping nut 17 continues to tighten itself as usual.
  • the clamping device described is extremely simple, inexpensive and fast, safe and easy to use. It allows a quick and safe change of the tool 15 without the need for additional special tools. Another advantage is that existing hand tool machines, in particular grinding machines, can be retrofitted with this clamping device without any other modifications. For this purpose, it is generally only necessary to replace their clamping nut by the clamping nut 17 according to the invention with the pressure washer 36. It is also advantageous that when the clamping fork 22 is transferred from the clamping position according to FIG. 1 into the release position, no torque is exerted on the spindle 10, so that handheld power tools equipped with such a clamping device no longer require an integrated spindle locking device.
  • the clamping nut 17 is, moreover, designed so that, if necessary, it can also be attacked by a special tool, e.g. in the form of a two-hole nut driver, so that the clamping nut 17 in particularly stubborn cases, e.g. in the rusted state, can also be solved in the usual way using such an auxiliary tool.
  • a special tool e.g. in the form of a two-hole nut driver
  • the clamping device described is suitable for clamping all possible tools 15 and in connection with various types of hand tools. It is particularly suitable for grinding machines, e.g. Angle grinder, and thereby for clamping disc-shaped tools 15.
  • the printing surface 28, 29 is e.g. each provided on a rolling element of the tendon.
  • the rolling element can e.g. consist of an eccentric role.
  • the tension member 21 is designed as a tension fork 22 according to the first embodiment.
  • rolling friction e.g. multiple roles, e.g. Needle body, which are axially acted upon by the pressure surfaces 28, 29 during the movement of the tension member 21 and allow rolling friction instead of sliding friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Clamps And Clips (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Gripping On Spindles (AREA)

Claims (12)

  1. Dispositif de serrage pour le blocage axial d'un outil (15), en particulier d'un disque, sur une collerette (16) d'une broche (10) entraînée en rotation, par un écrou de tension (17) pourvu d'un filetage interne (20), écrou qui peut être vissé sur un appendice fileté (13) à l'extrémité de la broche (10) et avec un organe de serrage (21) qui peut être soumis par l'écrou de tension (17) à une force de pression axiale, disposé axialement entre l'outil (15), d'une part, et l'écrou de tension (17) d'autre part, organe de serrage (21) qui appuie sur l'outil (15) et peut comprimer celui-ci contre la collerette (16), dispositif de serrage caractérisé en ce que l'organe de serrage (21) est maintenu sur l'écrou de tension (17) en pouvant pivoter autour d'un axe de pivotement (30), de préférence diamétral et présente au moins une surface de pression (28, 29) excentrée par rapport à cet axe de pivotement (30), surface dont la distance radiale par rapport à l'axe de pivotement (30) augmente pour produire la force de serrage du fait d'une force matérielle qui varie dans le sens du pivotement depuis la position desserrée jusqu'à la position de serrage.
  2. Dispositif de serrage selon la revendication 1, caractérisé en ce que la distance radiale des surfaces de pression (28, 29) par rapport à l'axe de pivotement (30) décroît dans le sens du pivotement depuis la position de serrage jusqu'à la position desserrée.
  3. Dispositif de serrage selon la revendication 1 ou 2, caractérisé en ce que la surface de pression est prévue sur un élément de roulement de l'organe de serrage.
  4. Dispositif de serrage selon la revendication 3, caractérisé en ce que l'élément de roulement consiste en un rouleau excentré.
  5. Dispositif de serrage selon les revendications 1 à 4, caractérisé en ce qu'entre l'une au moins des surfaces de pression (28, 29) et l'outil (15) est disposé un organe intermédiaire, qui de son côté, peut être pressé axialement contre l'outil (15) et peut être soumis axialement à l'action de l'organe de serrage (21).
  6. Dispositif de serrage selon la revendication 5, caractérisé en ce que sont prévus comme organe intermédiaire, un ou plusieurs rouleaux, par exemple des aiguilles, des billes ou des corps de roulement analogues, qui lors du mouvement de l'organe de serrage (21) peuvent être soumis à l'action des forces de pression par les surfaces (28, 29) dans le sens du serrage, parallèlement à l'axe de l'outil et rouler sur la surface de pression.
  7. Dispositif de serrage selon la revendication 5, caractérisé en ce que l'organe intermédiaire consiste en un disque de pression (36) disposé entre l'outil (15) et l'organe de serrage (21), mobile axialement, qui est soumis à l'action de la surface de pression excentrée (28, 29) et appuie par une face frontale contre l'outil (15).
  8. Dispositif de serrage selon les revendications 1 à 7, caractérisé en ce que l'organe de serrage (21) consiste en une fourche de serrage (22), qui est montée de façon à pouvoir pivoter autour de l'axe de pivotement (30) sur l'écrou de tension (17), chaque extrémité des branches (26, 27) de la fourche présentant respectivement une surface de pression excentrée (28, 29), avec laquelle les extrémités des branches de la fourche (26, 27) surplombent axialement respectivement la surface frontale (37) de l'écrou de tension et agissent sur l'outil (15) directement ou indirectement par l'intermédiaire du disque de pression (36).
  9. Dispositif de serrage selon l'une des revendications 1 à 8, caractérisé en ce que les surfaces de pression respectives (28, 29) présentent à peu près dans la zone de plus grande excentricité (e max) un méplat (34, 35) ou une surface d'excentricité réduite.
  10. Dispositif de serrage selon la revendication 8 ou 9, caractérisé en ce que les extrémités (26, 27) des branches de la fourche, sont reçues dans des fentes (38, 39) ménagées sur la collerette (18) de l'écrou de tension (17).
  11. Dispositif de serrage selon l'une des revendications 8 à 10, caractérisé en ce que la fourche de serrage (22) avec ses branches (23, 24) et ses autres parties (25) repose sur la face frontale de l'écrou de tension (17), en position de serrage, qui est tournée à l'opposé ou vers l'outil (15) et se trouve au-dessus de cette face frontale.
  12. Dispositif de serrage selon l'une des revendications 8 à 10, caractérisé en ce que la fourche de serrage (22) est reçue avec ses branches (23, 24) et ses autres parties (25) sur le côté axial de l'écrou de tension (17), tourné vers ou à l'opposé de l'outil (15) dans des renfoncements (41, 42) dans lesquels il s'enfonce en position de serrage.
EP87907667A 1986-12-17 1987-11-28 Dispositif de serrage pour bloquer un outil, un disque en particulier, suivant une direction axiale Expired - Lifetime EP0334864B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87907667T ATE85257T1 (de) 1986-12-17 1987-11-28 Spanneinrichtung zum axialen festspannen eines werkzeuges, insbesondere einer scheibe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3643067 1986-12-17
DE19863643067 DE3643067A1 (de) 1986-12-17 1986-12-17 Spanneinrichtung zum axialen festspannen eines werkzeuges, insbesondere einer scheibe

Publications (2)

Publication Number Publication Date
EP0334864A1 EP0334864A1 (fr) 1989-10-04
EP0334864B1 true EP0334864B1 (fr) 1993-02-03

Family

ID=6316387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87907667A Expired - Lifetime EP0334864B1 (fr) 1986-12-17 1987-11-28 Dispositif de serrage pour bloquer un outil, un disque en particulier, suivant une direction axiale

Country Status (8)

Country Link
US (1) US4976071A (fr)
EP (1) EP0334864B1 (fr)
JP (1) JPH02501129A (fr)
AT (1) ATE85257T1 (fr)
BR (1) BR8707918A (fr)
DE (2) DE3643067A1 (fr)
ES (1) ES2005993A6 (fr)
WO (1) WO1988004596A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
CN104044062A (zh) * 2013-03-15 2014-09-17 昆山齐升磨料磨具有限公司 一种新型的磨具

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US4909113A (en) * 1988-11-01 1990-03-20 Mariupolskii Metallurgicheskii Institut Device for clamping a circular saw blade
AT392230B (de) * 1989-05-29 1991-02-25 Thoeress Josef Vorrichtung zum gleichzeitigen schleifschaerfen saemtlicher saegezaehne eines gattersaegeblattes
HUT70006A (en) * 1990-09-12 1995-09-28 Matthews Fastener particularly for grinding wheel
EP0521259B1 (fr) * 1991-07-05 1994-07-27 C. & E. FEIN GmbH & Co. Machine-outil portative
US5577872A (en) * 1993-03-15 1996-11-26 Power Tool Holders Incorporated Torque enhancing tightening screw
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JPH0727121A (ja) * 1993-06-30 1995-01-27 Jacobs Japan Inc 締付け用ネジ
GB9313632D0 (en) * 1993-07-01 1993-08-18 Black & Decker Inc Improvements in or relating to flange locks
IT1266572B1 (it) * 1993-07-30 1997-01-09 Guido Valentini Congegno per il montaggio e la rimozione manuali di dischi operatori in utensili manuali per la lavorazione di superfici
US5871322A (en) * 1994-12-22 1999-02-16 Power Tool Holders Incorporated Clamp screw
US5964006A (en) * 1997-01-13 1999-10-12 3M Innovative Properties Company Rotary surface treatment tool
US6273659B1 (en) 1997-02-17 2001-08-14 Power Tool Holders Incorporated Locking mechanism for a rotary working member
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FR2805013B1 (fr) * 2000-02-16 2003-01-10 Diamant Boart Sa Ecrou de serrage et de blocage d'un outil, tel qu'un disque d'une machine d'usinage sur l'arbre de ladite machine
US7013987B2 (en) * 2000-09-08 2006-03-21 Black & Decker Clutch assembly and clamp mechanism for rotary tool disc
DE20117159U1 (de) * 2001-10-16 2002-02-14 C. & E. Fein GmbH & Co KG, 70176 Stuttgart Werkzeugmaschine mit Befestigungsflansch
GB0515575D0 (en) * 2005-07-29 2005-09-07 Gmca Pty Ltd Clamping apparatus
US20070149099A1 (en) * 2005-12-23 2007-06-28 Sunmatch Industrial Co., Ltd. Tool-less quick locking screw nut
DE102008050173A1 (de) * 2008-10-01 2010-04-08 Giesecke & Devrient Gmbh Banknotenbearbeitungsvorrichtung
US8905822B2 (en) 2011-10-07 2014-12-09 Black & Decker Inc. Clamp nut
CN103659606A (zh) * 2012-09-17 2014-03-26 广西玉柴机器股份有限公司 金刚砂轮修整工具及修整方法
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system
US9475172B2 (en) 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
CN106903611B (zh) * 2017-03-07 2023-06-27 佛山华数机器人有限公司 一种打磨工具的中心标定装置
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
CN112139892A (zh) * 2020-09-29 2020-12-29 福建泉州南星大理石有限公司 一种水磨石抛光工艺
CN115922564B (zh) * 2023-03-09 2023-07-04 镇江丰成特种工具有限公司 一种磨轮的安装结构

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Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
CN104044062A (zh) * 2013-03-15 2014-09-17 昆山齐升磨料磨具有限公司 一种新型的磨具

Also Published As

Publication number Publication date
DE3784077D1 (de) 1993-03-18
WO1988004596A1 (fr) 1988-06-30
ES2005993A6 (es) 1989-04-01
JPH02501129A (ja) 1990-04-19
EP0334864A1 (fr) 1989-10-04
ATE85257T1 (de) 1993-02-15
DE3643067A1 (de) 1988-06-23
BR8707918A (pt) 1990-03-01
US4976071A (en) 1990-12-11

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