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EP0732174A2 - Dispositif de serrage pour fixer un outil - Google Patents

Dispositif de serrage pour fixer un outil Download PDF

Info

Publication number
EP0732174A2
EP0732174A2 EP95120336A EP95120336A EP0732174A2 EP 0732174 A2 EP0732174 A2 EP 0732174A2 EP 95120336 A EP95120336 A EP 95120336A EP 95120336 A EP95120336 A EP 95120336A EP 0732174 A2 EP0732174 A2 EP 0732174A2
Authority
EP
European Patent Office
Prior art keywords
nut part
clamping device
spring
roller bearing
clamping
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.)
Granted
Application number
EP95120336A
Other languages
German (de)
English (en)
Other versions
EP0732174A3 (fr
EP0732174B1 (fr
Inventor
Erich Preis
Siegfried STÄMMELE
Alfred Schmidt
Herbert Piater
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.)
Techtronic Industries GmbH
Original Assignee
Atlas Copco Elektrowerkzeuge 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 Atlas Copco Elektrowerkzeuge GmbH filed Critical Atlas Copco Elektrowerkzeuge GmbH
Publication of EP0732174A2 publication Critical patent/EP0732174A2/fr
Publication of EP0732174A3 publication Critical patent/EP0732174A3/fr
Application granted granted Critical
Publication of EP0732174B1 publication Critical patent/EP0732174B1/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
    • 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
    • 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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings

Definitions

  • the invention relates to a clamping device for fixing a disk-shaped tool, in particular grinding wheel, to a threaded spindle of a hand-held power tool, a nut part that can be screwed onto the threaded spindle presses a clamping disk against the tool and an axial roller bearing is arranged between your nut part and the clamping disk.
  • a grinding wheel is to be attached to an angle grinder.
  • the clamping device is an independent part, so that angle grinders can also be retrofitted with conventional threaded spindles with the clamping device.
  • Such a tensioning device is described in DE-OS 21 56 770.
  • the axial roller bearing is intended to substantially eliminate the friction between the tool or the tensioning washer lying against it and your nut part. As a result, the mother does not pull tighter in the company.
  • the nut must therefore be tightened sufficiently before starting operation by means of a wrench to transmit the torque from the threaded spindle to the grinding wheel. In practice, this requires a wrench. At In this design, the entire torque is transmitted to the grinding wheel via a flange of the threaded spindle.
  • the tensioning wheel itself does not transmit any torque to the grinding wheel.
  • DE 37 05 638 C1 describes a tensioning device in which the tensioning disk is wedged with the nut part by clamping parts for torque transmission. To relax the clamping device, the clamping parts are released radially by actuating a rotating ring. The nut part tightens accordingly under extreme loads.
  • the tensioning device of DE 37 05 638 C1 does not have a slip clutch function. The overall height of this clamping device is comparatively large, which bothers when working. Since the rotating ring is close to the grinding wheel, actuation is not very convenient in practice.
  • a lubricant ring is arranged between the nut part and the tensioning disk. Under extreme loads, the nut is tightened so much that it can only be loosened by hand.
  • a pivotable flap is provided on the nut for actuating it.
  • DE 42 43 328 C1 describes a quick release device with a plate spring.
  • the disc spring is intended to prevent the quick release device from detaching itself from the threaded spindle when the grinding wheel is braked.
  • the disc spring has no effect when working with the grinding wheel; it does not lead to one Overload slip clutch effect.
  • the object of the invention is to propose a tensioning device of the type mentioned at the outset, which allows simple and safe manual tensioning and loosening, combined with a slip clutch function in the event of an overload.
  • the above object is achieved in a tensioning device of the type mentioned in that a spring is arranged next to the axial roller bearing between the tensioning disk and the nut part, the spring for transmitting the torque from the threaded spindle to the tool a frictional connection between the nut part and forms the tensioning washer and the axial roller bearing axially supports the tensioning washer on the nut part, and that when an upper limit value of the torque (overload) is exceeded, the nut part slips relative to the tensioning disk, the axial roller bearing rotating.
  • the spring presses on the clamping washer so that it is pressed against the tool. There is thus a frictional connection for the transmission of the torque from your nut part to the clamping washer or the tool.
  • the connection is tightened until a torque value predetermined by the preload of the plate spring is reached.
  • the axial roller bearing axially supports the tension plate on the nut part.
  • the nut part is actuated to release the clamping device.
  • the tensioning device can be tensioned and released by hand without auxiliary tools.
  • a pivotable flap can be mounted on the mother part to facilitate operability. With this the screwing of the nut part is easily possible.
  • clamping device Another advantage of the clamping device is that all angle grinders can be easily retrofitted with a standard threaded spindle. It is also favorable that the clamping device can be manufactured in a flat design.
  • the tensioning device has a nut part which consists of a nut (1) and a bell (2) which is arranged in a rotationally fixed manner thereon.
  • the nut (1) can be screwed with an internal thread (3) onto a threaded spindle, not shown, of a hand machine tool, for example an angle grinder.
  • the threaded spindle is provided with a flange against which a grinding wheel, not shown, can be pressed.
  • a tensioning disc (4) is rotatable on the nut (1) and axially displaceable with a small stroke.
  • a ring edge (5) of the nut (1) holds the tensioning washer (4) on the nut (1).
  • An outer edge (6) of the bell (2) stands in front of the outer circumference of the tensioning disc (4).
  • An annular surface (7) is formed on the tensioning disc (4) and is used for contact with the grinding disc.
  • the grinding wheel is thus between the flange of the threaded spindle and the annular surface (7).
  • a hardened washer (8) lies in the bell (2).
  • An axial needle bearing (9) is arranged between the bell (2) or the intermediate disk (8) and the tensioning disk (4), and the intermediate disk (8) serves as a running surface.
  • An annular disc spring (10) is provided between the intermediate disc (8) and the clamping disc (4), which is supported with its inner edge (11) on the intermediate disc (8) and with its outer edge (12) on the clamping disc (4).
  • the plate spring (10) surrounds the needle bearing (9) on its outer circumference.
  • the plate spring (10) instead of the plate spring (10), another spring of this type, for example a corrugated spring, could also be provided.
  • a rubber-elastic ring could also be used as the spring (10).
  • the plate spring (10) or the ring seals the space in which the axial needle bearing (9) is located from the outside.
  • a flap (13) is pivotably mounted on the mother part (1, 2) by means of locking lugs (14).
  • the flap (13) extends approximately 180 o and is provided with depressions (15).
  • the locking lugs (14) are loaded by a further plate spring (16) and designed so that the flap (13) in a flat position on the bell (2) and in about 80 o swung up position is locked.
  • the further disc spring (16) is dimensioned such that the flap (13) automatically moves from the folded-up position into the position in which it is on the bell (2 ) rests.
  • Auxiliary holes (17) can be provided on the bell (2), by means of which the nut part (1, 2) can be released in special malfunctions by inserting a standard two-hole nut driver.
  • the functioning of the clamping device described is essentially as follows: After the grinding wheel has been placed on the flange of the threaded spindle, the clamping device is placed on the threaded spindle and the nut part (1, 2) is screwed on by means of the flap (13) when it is folded up.
  • the ring surface (7) of the tensioning wheel (4) lies against the grinding wheel and is tensioned against the grinding wheel while the plate spring (10) is under tension.
  • a non-rotatable frictional connection is created between the nut part (1, 2) and the tensioning disc (4) caused by the plate spring (10) and thus also a non-rotatable frictional connection between the tensioning disc (4) and the grinding wheel.
  • the upper limit of the transmittable torque is limited by the tensioning force of the plate spring (10) and by the axial needle bearing (9) preventing further clamping of the plate spring (10). It is dimensioned so that it is sufficient for normal operation of the grinding wheel.
  • a friction or form fit could also be specifically designed between the washer (8) and the inner edge (11) of the plate spring (10), so that the plate spring (10) with its outer edge (12) on the tension plate (4 ) slips through.
  • This has the advantage that a larger part of the axial forces is transmitted via the thrust bearing (9). This lowers the torque required to release the tensioning device.
  • the flap (13) is folded up and the nut part (1, 2) is loosened with it, whereby the plate spring (10) relaxes and the ring surface (7) of the tensioning disk (4) is released from the grinding disk .
  • the plate spring (10) ensures that the tension disc (4) loosens in relation to the nut part (1,2) before the tensioning disc (4) detaches from the grinding disc. This is cheap because otherwise the clamping device would be unscrewed from the threaded spindle in the clamped state.
  • the described mode of operation takes place in a flat characteristic area of the plate spring (10).
  • the spring distance is only a fraction of a ⁇ m, for example 2/10 ⁇ m.
  • the plate spring (10) is preloaded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP95120336A 1995-03-14 1995-12-21 Dispositif de serrage pour fixer un outil Expired - Lifetime EP0732174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509147A DE19509147C1 (de) 1995-03-14 1995-03-14 Spanneinrichtung zum Festlegen eines scheibenförmigen Werkzeugs
DE19509147 1995-03-14

Publications (3)

Publication Number Publication Date
EP0732174A2 true EP0732174A2 (fr) 1996-09-18
EP0732174A3 EP0732174A3 (fr) 1997-07-23
EP0732174B1 EP0732174B1 (fr) 1998-07-08

Family

ID=7756613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95120336A Expired - Lifetime EP0732174B1 (fr) 1995-03-14 1995-12-21 Dispositif de serrage pour fixer un outil

Country Status (3)

Country Link
US (1) US5707275A (fr)
EP (1) EP0732174B1 (fr)
DE (2) DE19509147C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19732263A1 (de) * 1997-07-26 1999-01-28 Schaeffler Waelzlager Ohg Spanneinrichtung zum lösbaren Befestigen eines scheibenförmigen Werkzeugs
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD417598S (en) * 1999-02-24 1999-12-14 Black & Decker Inc. Rotatable cutting tool
USD424076S (en) * 1999-02-24 2000-05-02 Black & Decker Inc. Mounting device for a cutting tool
US6439091B1 (en) * 1999-04-19 2002-08-27 Black & Decker Inc. Clutch mechanism
DE10017457A1 (de) * 2000-04-07 2001-10-11 Bosch Gmbh Robert Schleifmaschinenwerkzeugaufnahme
DE10017458A1 (de) * 2000-04-07 2001-10-18 Bosch Gmbh Robert Schleifmaschinenwerkzeugaufnahme
DE10030586A1 (de) * 2000-06-21 2002-01-10 Bruno Schmitz Schleifmittelwer Werkzeug
US6645058B2 (en) 2000-11-30 2003-11-11 Black & Decker Inc. Clamp mechanism for rotary tool disc
US6863596B2 (en) * 2001-05-25 2005-03-08 3M Innovative Properties Company Abrasive article
DE10136459A1 (de) * 2001-07-26 2003-02-13 Bosch Gmbh Robert System mit einer Werkzeugaufnahme
US6743085B2 (en) 2001-11-20 2004-06-01 3M Innovative Properties Company Rotating back up abrasive disc assembly
DE10205848C2 (de) * 2002-02-13 2003-12-04 Metabowerke Gmbh Spannmutter zum Fixieren eines scheibenförmigen Werkzeugs
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
DE202014011279U1 (de) 2014-02-28 2019-01-08 Metabowerke Gmbh Spannmutter

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2156770C3 (de) * 1971-11-16 1974-06-20 Hermann 7031 Maichingen Hefner Vorrichtung zur lösbaren Befestigung einer Schleifscheibe oder dergleichen auf einer Treibspindel
DE3012836C2 (de) * 1980-04-02 1985-09-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Einrichtung zum Festspannen der Schleifscheibe von Winkelschleifern
DE3644444A1 (de) * 1986-12-24 1988-07-07 Pav Praezisions Apparatebau Ag Messkluppe
DE3644441A1 (de) * 1986-12-24 1988-07-07 Bosch Gmbh Robert Spanneinrichtung zum loesbaren befestigen eines werkzeuges, insbesondere einer scheibe
DE3702142C2 (de) * 1987-01-24 1995-09-21 Bosch Gmbh Robert Spanneinrichtung zum axialen Festspannen eines Werkzeuges, insbesondere eines als Scheibe ausgestalteten spanenden Werkzeuges
DE3705638C1 (de) * 1987-02-21 1988-09-08 Bosch Gmbh Robert Spanneinrichtung zum axialen Festspannen eines scheibenfoermigen Werkzeuges,insbesondere einer Schleifscheibe,an einem Flansch einer angetriebenen Spindel
DE3841181A1 (de) * 1988-12-07 1990-06-13 Bosch Gmbh Robert Handwerkzeugmaschine mit einer mehrteiligen handbetaetigbaren schnellspanneinrichtung
DE3917345A1 (de) * 1989-05-27 1990-11-29 Licentia Gmbh Einrichtung zum drehfesten vereinigen scheibenfoermiger bearbeitungswerkzeuge mit der arbeitsspindel von elektrowerkzeugen
NZ239780A (en) * 1990-09-12 1995-10-26 Norman Leslie Matthews Reduced friction fastener; low friction material between threaded hub and thrust disc
DE4031725A1 (de) * 1990-10-06 1992-04-09 Bosch Gmbh Robert Schnellspanneinrichtung, insbesondere zum befestigen scheibenfoermiger werkzeuge an einer antriebsspindel einer handwerkzeugmaschine
JPH081805Y2 (ja) * 1991-03-20 1996-01-24 リョービ株式会社 工具の着脱装置
DE4238466C1 (de) * 1992-11-16 1994-01-20 Metabowerke Kg Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs
FR2698032B1 (fr) * 1992-11-16 1995-10-06 Metabowerke Gmbh Dispositif de serrage rapide destine au serrage axial d'un outil en forme de disque.
DE4243328C1 (de) * 1992-12-22 1994-06-09 Metabowerke Kg Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19732263A1 (de) * 1997-07-26 1999-01-28 Schaeffler Waelzlager Ohg Spanneinrichtung zum lösbaren Befestigen eines scheibenförmigen Werkzeugs
WO1999004928A3 (fr) * 1997-07-26 1999-04-15 Schaeffler Waelzlager Ohg Dispositif de serrage permettant de fixer de façon liberable un outil en forme de disque
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Also Published As

Publication number Publication date
EP0732174A3 (fr) 1997-07-23
DE59502759D1 (de) 1998-08-13
US5707275A (en) 1998-01-13
DE19509147C1 (de) 1996-05-23
EP0732174B1 (fr) 1998-07-08

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