EP0336930A1 - Spanneinrichtung zum lösbaren befestigen eines werkzeuges, insbesondere einer scheibe. - Google Patents
Spanneinrichtung zum lösbaren befestigen eines werkzeuges, insbesondere einer scheibe.Info
- Publication number
- EP0336930A1 EP0336930A1 EP87907666A EP87907666A EP0336930A1 EP 0336930 A1 EP0336930 A1 EP 0336930A1 EP 87907666 A EP87907666 A EP 87907666A EP 87907666 A EP87907666 A EP 87907666A EP 0336930 A1 EP0336930 A1 EP 0336930A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flange
- clamping device
- locking
- ring part
- 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.)
- Granted
Links
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
- Clamping device for releasably fastening a tool, in particular a disk
- the invention is based on a clamping device for releasably fastening a tool, in particular a disk, according to the generic preamble of the main claim.
- Clamping devices for, in particular, disk-shaped tools are particularly suitable for portable hand-held machine tools, and here in particular for grinding machines.
- a clamping device is known (DE-PS 30 12 836), in which the one flange, which is arranged on the side of the tool facing the housing of the hand-held power tool, is displaceable relative to the spindle and is coupled to this in a torque-transmitting manner.
- This rear support flange is supported against axial displacement in an axial end position via a shoulder of the spindle which forms a support element therefor.
- the other flange which can be screwed onto the end of the spindle, consists of a nut with a in cross section approximately hat-shaped, separate clamping element, which is supported axially via a helical spring against the flange of the clamping nut.
- the hat-shaped clamping element When screwing and tightening this clamping nut, 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 into direct contact with a facing axial side of the rear flange and at further tightening the clamping nut, this rear, spindle-side flange is tightened together with the clamping nut, possibly until the rear flange comes to rest axially on the shoulder surface of the spindle forming the supporting element.
- the aim of this is to clamp the grinding wheel with a defined contact pressure in an angle grinder and to 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. If the torque applied to the grinding wheel becomes too large, the grinding wheel stops, while the rear flange and the clamping nut with the clamping element execute a relative movement.
- This clamping device counteracts the effect that the clamping nut continues to tighten during operation, which otherwise makes it considerably more difficult to loosen the clamping nut when changing the grinding wheel. Nevertheless, loosening the clamping nut is only possible with the help of a special auxiliary tool, and depending on the design of the machine, the spindle must be countered accordingly with a second auxiliary tool, for example a wrench.
- a tool change is made possible without any auxiliary tool, which, moreover, can be carried out quickly and safely.
- Another advantage is that existing handheld power tools can be converted without major modifications. For this, e.g. a simple exchange of the existing rear support flange for a ring part with an adapted flange.
- the front clamping nut is unchanged in a known manner, so that standardized, inexpensive parts can be used here. At the same time, it can still be used for particularly stubborn cases, e.g. if the clamping nut is rusty, a key is attached to it and the clamping nut is loosened with this auxiliary tool.
- the rear part of the ring has a non-rotatable molded part with the spindle, so that relevant regulations are met. It is also advantageous that the clamping device is not arranged on the working side of the tool, but in the area between the tool and the housing-side bearing flange, so that any risk of damage, e.g. by rubbing against the workpiece. This also prevents any axial overhang on the working side of the tool, which may impair work.
- FIG. 1 shows a schematic, axial longitudinal section of a clamping device as part of an angle grinder with a clamped grinding wheel
- Fig. 2 is a schematic side view of a
- FIG. 3 shows a schematic side view corresponding to that in FIG. 2, but with the tool loosened
- FIG. 4 shows a schematic plan view with a partial section along the line IV-IV in FIG. 3.
- Angle grinder designed, portable hand tool shown, which has a motor-driven and gearbox-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, for example, consists of the indicated grinding wheel or another tool wheel, a rubber plate or the like.
- the tool 15 is axially clamped and clamped between two flanges 16 and 17.
- the flange 17 seated at the spindle end is designed as a conventional clamping nut 18 which adjoins the flange.
- Has hub part 19 and is provided on the inside with a continuous internal thread 20 with which the clamping nut 18 is screwed onto the threaded shoulder 13.
- On the outer circumferential surface of the spindle 10 serves to drive a tool 15 which, for example, consists of the indicated grinding wheel or another tool wheel, a rubber plate or the like.
- the tool 15 is axially clamp
- Hub part 19 is the center of the tool 15 when fastened
- the other flange 16 is displaceable relative to the spindle 10 and coupled to the spindle 10 in a manner to be transmitted in a torque-transmitting manner. It is secured against axial displacement via a support element 21 and can be relieved of the clamping pressure for the tool 15.
- the support element 21 consists of a ring part 22 with a bottom 23 and a cylinder part 24, which is approximately inverted in cross-section. With the bottom 23, the ring part 22 is axially supported on the ring shoulder 11 and centered radially on the cylindrical shoulder 12.
- the ring part 22 has a non-rotatable positive connection with the spindle 10, from which it is rotatably carried in the direction of rotation according to arrow 25 when the motor is switched on.
- the flange 15 consists essentially of a relatively flat disc. It is relative to the spindle 10 on the outer peripheral surface of the hub part 19 Ring part 22 axially displaceable and rotatable within limits.
- the ring part 22 and the flange 15 are coupled by means of a spring 26, which is designed here as a torsion spring, one end 27 of which engages the ring part 22 and the other end 28 of the flange 16.
- a spring is only indicated schematically in FIGS. 2 and 3, which engages with the end 28 on the flange 16 and acts on it in the direction of the indicated arrow 29 in a resilient manner relative to the ring part 22.
- the ring part 22 and the flange 15 have several, e.g. three, in the circumferential direction successive, left-rising inclined surfaces 32 and 33, with which the flange 16 and the ring member 22 axially abut.
- the inclined surfaces 32 of the ring part 22 are located on the end face 30 of the cylinder part 24 facing the flange 15.
- the wedge angle of both inclined surfaces 32, 33 is chosen to be large enough that it lies in the area of self-locking.
- the flange 16 strikes the step surfaces with the step surfaces 34 assigned to the step surfaces while limiting the pivoting angle. This state is shown in FIG. 3, in which the clamping device is released and thus the screwed-on flange 17 is relieved of the axial clamping pressure acting on the tool 15 from the flange 16.
- the flange 15 has an axially parallel connection to the end of the respective inclined surface 33 located downstream of the wedge Directional locking lugs 36, the front surface of which is adjacent to the inclined surface 33 and is each formed as a locking surface 35.
- the opposite end face of each locking lug 36 of the flange 16 is designed as an approximately parallel driving surface 37.
- the ring part 22 has, in the circumferential direction of each inclined surface 32, upstream, approximately axially parallel driver surfaces 38 which, when the tool 15 (FIG. 2) is clamped, abut against an associated driving surface 37 of the locking lug 36 while driving the flange 16.
- the Stepped surfaces 34 and circumferentially spaced driving surfaces 38 of the ring member 22 are formed by the two end faces of respective locking recesses 39, which consist of openings in the wall of the cylinder member 24.
- the locking recesses 39 adjoin the upward wedge end of each inclined surface 32 and are open axially and in the direction of the flange 16.
- the opening width of each latching recess 39 measured in the circumferential direction is larger than the width of each locking lug 36 engaging therein.
- rolling elements 40 are arranged between the axially adjacent inclined surfaces 32 and 33 of the ring part 22 and the flange 16, respectively, which make the sliding friction between the inclined surfaces 32, 33 a rolling friction and thus substantially reduce the friction.
- the rolling elements 40 here consist of balls which are inserted into recessed grooves 41 in the inclined surfaces 32.
- the flange 16 is fastened to a cylinder sleeve 42 surrounding it, for example screwed into it.
- the cylinder sleeve 42 also extends axially over the cylinder part 24 of the ring part 22, which is in the form of an axial stop at the end facing away from the tool 15 an annular shoulder 43 is overlapped.
- the flange 16 together with the cylinder sleeve 42 is secured on the ring part 22 against detachment in the axial direction which faces away from the ring part 22.
- the flange 16 and the ring part 22 are held together by means of the cylinder sleeve 42.
- the tensioning device also has at least one releasable locking device 44, via which the flange 16 in the position shown in FIG. 2, in which the tool 15 is clamped, is positively secured with respect to the ring part 22.
- the locking device 44 has a tongue 45 which is fastened at one end to the ring part 22 by means of screw 46, to be precise on the side which points towards the flange 16.
- the tongue 45 is directed approximately radially. It acts approximately like a spring leaf and is additionally pressed down by means of a spring 47 in the form of a cylindrical coil spring in FIGS. 2 and 3.
- the tongue 45 contains a recess 48 for holding and centering the end of the spring 47.
- the spring 47 engages at a relatively large radial distance from the fastening point of the tongue 45 by means of the screw 45.
- the tongue 45 is dimensioned with respect to the cross-sectional thickness so that it is bent downwards under the action of the relaxing spring 47 in the manner of a spring tongue in FIGS. 2 and 3 and can be bent in the opposite direction by means of manual actuation with compression of the spring 47.
- the tongue 47 is also shaped, e.g. bent, can be that it is tension-free and relieved in the position shown in Fig.2, brought down in the axial direction and can be lifted axially upwards against the action of the spring 47 in the position shown in Fig. 3.
- the tongue 45 rests in a recess 49 which runs in the foot region of the latching recess 39 and in the region the spring 47 is provided with a recess 50 receiving and centering this end.
- the width of the tongue 45 and the locking lug 36 together is chosen approximately as large as the total width of the locking recess 39, so that the locking lug 36 and the tongue 45 can be found side by side within the locking recess 39 in the clamped state of the tool 15 according to FIG. 2.
- the tongue 45 thus engages in the locking position 39 in the position of the flange 16 clamping the tool, between the step surface 34 and the locking surface 35 of the locking lug 36. In this way, the tongue 45 secures in this position (FIG. 2) the contact of the locking lug 36 with its driving surface 37 on the driving surface 38 of the ring part 22.
- the spring 26 additionally causes the flange 16 and of the ring part 22 relative to each other so that both parts slide up on the inclined surfaces 32, 33 and are thereby pressed axially apart.
- the ring part 22 is rotationally blocked by suitable means, which can be achieved by appropriately blocking the spindle 10 e.g. can be done by means of a spindle locking device integrated in the hand tool.
- suitable means which can be achieved by appropriately blocking the spindle 10 e.g. can be done by means of a spindle locking device integrated in the hand tool.
- the friction in the transmission up to the motor is sufficient to prevent the spindle 10 from rotating in the direction of the arrow 25, at least within limits.
- this is raised with one hand against the action of the spring 47 into the position shown in Fig. 3, in which the tongue 45 enters the recess 49, which is deep enough that the Tongue 45 now releases the locking lug 36, which can drive over the tongue 45 with its axially facing end.
- the tool 15 is rotated by hand in the same direction according to arrow 25, thus counterclockwise.
- the flange 17 and the flange 16 are also entrained via the friction.
- the rotation of the flange 16 in this direction causes its inclined surfaces 33 to slide downward on the inclined surfaces 32 of the rotationally blocked ring part 22, this sliding movement becoming a rolling movement with reduced rolling friction due to the rolling bodies 40.
- the flange 16 moves axially in the direction of the ring part 22, which leads to a corresponding axial relaxation.
- the clamping nut 18 can then be easily unscrewed by hand.
- the sliding movement of the flange 16 with the inclined surfaces 33 wedge down the inclined surfaces 32 is limited in that the locking surfaces 35 on one side of the locking lugs 36 on the
- Stepped surfaces 34 on the associated side of the respective Attach the notch (Fig. 3).
- the spring 26 is able to rotate the flange 16 relative to the ring part 22, so that the inclined surfaces 33 of the flange 16 slide upwards on the inclined surfaces 32 of the ring part 22 and the two parts 15, 22 are axially pushed apart again.
- This movement is limited by the stop of the locking lugs 36 with their driving surfaces 37 on the facing driving surfaces 38 of the respective locking recess 39.
- each locking lug 36 is in the position according to FIG. 2, in which the tongue 45 previously blocked by the locking lug 36 under the action of the relaxing spring 47 automatically moves out of the recess 49 into the space between each step surface 34 and locking surface
- the rolling bodies 40 arranged between the inclined surfaces 32, 33 have the advantage that the fore-end friction between the two is reduced to rolling friction and is thus practically negligible.
- the clamping device described is simple, inexpensive and fast, safe and easy to use. It enables 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 also be retrofitted without any major changes Conversion can be equipped with this clamping device.
- the existing rear flange has to be exchanged for the unit consisting of the ring part 22 and flange 16, held together via the cylinder sleeve 42.
- the existing, for example standardized, clamping nut 18 in other machines is retained unchanged, as is the fact that the part supporting the tool 17 with the spindle 10 has a non-rotatable form fit. This complies with the relevant regulations.
- the clamping device is not limited to grinding wheels as a tool 15. Rather, other tools, for example cup wheels, brushes, rubber plates or the like, can be clamped in the same way without tools.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3644440 | 1986-12-24 | ||
DE19863644440 DE3644440A1 (de) | 1986-12-24 | 1986-12-24 | Spanneinrichtung zum loesbaren befestigen eines werkzeuges, insbesondere einer scheibe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0336930A1 true EP0336930A1 (de) | 1989-10-18 |
EP0336930B1 EP0336930B1 (de) | 1991-06-05 |
Family
ID=6317197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870907666 Expired - Lifetime EP0336930B1 (de) | 1986-12-24 | 1987-11-28 | Spanneinrichtung zum lösbaren befestigen eines werkzeuges, insbesondere einer scheibe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0336930B1 (de) |
JP (1) | JPH02501128A (de) |
BR (1) | BR8707952A (de) |
DE (2) | DE3644440A1 (de) |
WO (1) | WO1988004975A1 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3832624A1 (de) * | 1988-09-26 | 1990-04-05 | Licentia Gmbh | Schnellspanneinrichtung fuer auf der arbeitswelle eines elektrowerkzeugs angebrachte scheibenfoermige werkzeuge |
DE3903765A1 (de) * | 1989-02-09 | 1990-08-16 | Licentia Gmbh | Schnellspanneinrichtung fuer scheibenfoermige bearbeitungswerkzeuge von elektrowerkzeugen |
DE3903766A1 (de) * | 1989-02-09 | 1990-08-16 | Licentia Gmbh | Schnellspanneinrichtung fuer scheibenfoermige bearbeitungswerkzeuge von elektrowerkzeugen |
AT392230B (de) * | 1989-05-29 | 1991-02-25 | Thoeress Josef | Vorrichtung zum gleichzeitigen schleifschaerfen saemtlicher saegezaehne eines gattersaegeblattes |
GB9204345D0 (en) * | 1992-02-28 | 1992-04-08 | Black & Decker Inc | Improvements in or relating to flange locks |
DE4243328C1 (de) * | 1992-12-22 | 1994-06-09 | Metabowerke Kg | Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs |
DE4238466C1 (de) * | 1992-11-16 | 1994-01-20 | Metabowerke Kg | Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs |
DE4305317C2 (de) * | 1993-02-20 | 1995-10-12 | Metabowerke Kg | Schnellspanneinrichtung zum axialen Festspannen eines scheibenförmigen Werkzeugs |
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 |
DE4337023B4 (de) * | 1993-10-29 | 2007-08-09 | Robert Bosch Gmbh | Motorgetriebene Handwerkzeugmaschine |
US5871322A (en) * | 1994-12-22 | 1999-02-16 | Power Tool Holders Incorporated | Clamp screw |
DE19649514A1 (de) * | 1996-11-29 | 1998-06-04 | Bosch Gmbh Robert | Handwerkzeugmaschine |
US6050741A (en) * | 1998-01-30 | 2000-04-18 | Power Tool Holders Incorporated | Tool clamping device |
US6179512B1 (en) | 1998-05-29 | 2001-01-30 | Power Tool Holders Incorporated | Collet nut |
DE10017458A1 (de) * | 2000-04-07 | 2001-10-18 | Bosch Gmbh Robert | Schleifmaschinenwerkzeugaufnahme |
DE10233365B4 (de) | 2002-07-23 | 2016-08-18 | Hilti Aktiengesellschaft | Werkzeugaufnahme für eine Kernbohrkrone |
DE10308743B3 (de) * | 2003-02-28 | 2004-11-11 | Hilti Ag | Schnellspannmutter für scheibenförmige Werkzeuge |
CN100339182C (zh) * | 2003-09-05 | 2007-09-26 | 苏州宝时得电动工具有限公司 | 盘状工具的夹紧与快换装置 |
US8434976B2 (en) | 2009-03-20 | 2013-05-07 | Black & Decker Inc. | Small hole saw mandrel assembly |
CN112476074B (zh) * | 2020-10-16 | 2022-09-16 | 江苏腾飞数控机械有限公司 | 一种数控磨刀机床的磨刀装置 |
CN113043166A (zh) * | 2021-03-19 | 2021-06-29 | 重庆运城制版有限公司 | 免粘贴砂轮夹紧方法 |
KR102441374B1 (ko) * | 2021-12-02 | 2022-09-07 | (주)삼한기업 | 핸드 그라인더의 그라인더 날 고정장치 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB118872A (en) * | 1917-08-10 | 1918-09-10 | Vickers Ltd | Improvements in or relating to Milling Cutters and similar Tools. |
GB1068656A (en) * | 1965-04-22 | 1967-05-10 | Sheffield Twist Drill & Steel | Improvements in chucks for milling machine cutters |
CH449931A (de) * | 1966-12-06 | 1968-01-15 | Perles Elektrowerkzeuge & Moto | Spannvorrichtung für das Blatt einer Handkreissäge |
DE3012836C2 (de) * | 1980-04-02 | 1985-09-26 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Einrichtung zum Festspannen der Schleifscheibe von Winkelschleifern |
US4637170A (en) * | 1985-01-17 | 1987-01-20 | Aleck Block | Abrasive apparatus |
DE3613987A1 (de) * | 1986-04-25 | 1987-10-29 | Metabowerke Kg | Vorrichtung zum loesbaren befestigen einer schleifscheibe |
-
1986
- 1986-12-24 DE DE19863644440 patent/DE3644440A1/de not_active Ceased
-
1987
- 1987-11-28 DE DE8787907666T patent/DE3770641D1/de not_active Expired - Lifetime
- 1987-11-28 EP EP19870907666 patent/EP0336930B1/de not_active Expired - Lifetime
- 1987-11-28 WO PCT/DE1987/000552 patent/WO1988004975A1/de active IP Right Grant
- 1987-11-28 JP JP62507072A patent/JPH02501128A/ja active Pending
- 1987-11-28 BR BR8707952A patent/BR8707952A/pt not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO8804975A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0336930B1 (de) | 1991-06-05 |
JPH02501128A (ja) | 1990-04-19 |
DE3770641D1 (de) | 1991-07-11 |
DE3644440A1 (de) | 1988-07-07 |
BR8707952A (pt) | 1990-02-13 |
WO1988004975A1 (en) | 1988-07-14 |
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