EP0732174A2 - Dispositif de serrage pour fixer un outil - Google Patents
Dispositif de serrage pour fixer un outil Download PDFInfo
- 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
Links
Images
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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19509147 | 1995-03-14 | ||
DE19509147A DE19509147C1 (de) | 1995-03-14 | 1995-03-14 | Spanneinrichtung zum Festlegen eines scheibenförmigen Werkzeugs |
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD424076S (en) * | 1999-02-24 | 2000-05-02 | Black & Decker Inc. | Mounting device for a cutting tool |
USD417598S (en) * | 1999-02-24 | 1999-12-14 | Black & Decker Inc. | Rotatable 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 |
DE102014102705B4 (de) | 2014-02-28 | 2020-06-18 | Metabowerke Gmbh | Spannmutter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2156770A1 (de) * | 1971-11-16 | 1973-05-30 | Hermann Hefner | Vorrichtung zur loesbaren befestigung einer schleifscheibe oder dergleichen auf einer treibspindel |
DE3012836A1 (de) * | 1980-04-02 | 1981-10-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Vorrichtung zum festspannen der schleifscheibe von winkelschleifern |
WO1990006210A1 (fr) * | 1988-12-07 | 1990-06-14 | Robert Bosch Gmbh | Outil manuel avec dispositif de serrage rapide a main en plusieurs parties |
DE4238466C1 (de) * | 1992-11-16 | 1994-01-20 | Metabowerke Kg | Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3644441A1 (de) * | 1986-12-24 | 1988-07-07 | Bosch Gmbh Robert | Spanneinrichtung zum loesbaren befestigen eines werkzeuges, insbesondere einer scheibe |
DE3644444A1 (de) * | 1986-12-24 | 1988-07-07 | Pav Praezisions Apparatebau Ag | Messkluppe |
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 |
DE3917345A1 (de) * | 1989-05-27 | 1990-11-29 | Licentia Gmbh | Einrichtung zum drehfesten vereinigen scheibenfoermiger bearbeitungswerkzeuge mit der arbeitsspindel von elektrowerkzeugen |
ATE148536T1 (de) * | 1990-09-12 | 1997-02-15 | Norman Leslie Matthews | Befestigungsvorrichtung |
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 |
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 |
-
1995
- 1995-03-14 DE DE19509147A patent/DE19509147C1/de not_active Expired - Lifetime
- 1995-12-21 EP EP95120336A patent/EP0732174B1/fr not_active Expired - Lifetime
- 1995-12-21 DE DE59502759T patent/DE59502759D1/de not_active Expired - Lifetime
-
1996
- 1996-01-31 US US08/594,472 patent/US5707275A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2156770A1 (de) * | 1971-11-16 | 1973-05-30 | Hermann Hefner | Vorrichtung zur loesbaren befestigung einer schleifscheibe oder dergleichen auf einer treibspindel |
DE3012836A1 (de) * | 1980-04-02 | 1981-10-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Vorrichtung zum festspannen der schleifscheibe von winkelschleifern |
WO1990006210A1 (fr) * | 1988-12-07 | 1990-06-14 | Robert Bosch Gmbh | Outil manuel avec dispositif de serrage rapide a main en plusieurs parties |
DE4238466C1 (de) * | 1992-11-16 | 1994-01-20 | Metabowerke Kg | Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs |
Cited By (4)
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 |
WO1999004928A2 (fr) * | 1997-07-26 | 1999-02-04 | INA Wälzlager Schaeffler oHG | Dispositif de serrage permettant de fixer de façon liberable un outil en forme de disque |
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 |
---|---|
US5707275A (en) | 1998-01-13 |
EP0732174B1 (fr) | 1998-07-08 |
EP0732174A3 (fr) | 1997-07-23 |
DE19509147C1 (de) | 1996-05-23 |
DE59502759D1 (de) | 1998-08-13 |
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