EP0231500B1 - Device for releasably mounting a disc-like working-tool - Google Patents

Device for releasably mounting a disc-like working-tool Download PDF

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Publication number
EP0231500B1
EP0231500B1 EP86117568A EP86117568A EP0231500B1 EP 0231500 B1 EP0231500 B1 EP 0231500B1 EP 86117568 A EP86117568 A EP 86117568A EP 86117568 A EP86117568 A EP 86117568A EP 0231500 B1 EP0231500 B1 EP 0231500B1
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EP
European Patent Office
Prior art keywords
flange
main body
balls
clamp
ring
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
EP86117568A
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German (de)
French (fr)
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EP0231500A2 (en
EP0231500A3 (en
Inventor
Manfred Kirn
Werner Grammer
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
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0231500A2 publication Critical patent/EP0231500A2/en
Publication of EP0231500A3 publication Critical patent/EP0231500A3/en
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Publication of EP0231500B1 publication Critical patent/EP0231500B1/en
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Expired - Lifetime legal-status Critical Current

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    • 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 is based on a device for releasably fastening a disk-shaped tool according to the preamble of independent claims 1 and 18.
  • a device for releasably fastening a disk-shaped tool according to the preamble of independent claims 1 and 18.
  • Such a device has already become known from DE-OS 29 37 045, but in which the support means is used is problematic.
  • a deformable medium is introduced as a support means between two adjacent, axially mutually movable parts - one of which is assigned to the clamping flange - into a cavity formed by these parts. When the disk-shaped tool is clamped, this medium is compressed to the limit of its compressibility.
  • at least one further wall section of the cavity mentioned can be brought arbitrarily into a position that enlarges the cavity against a retention force that cannot be overcome by the reaction force of the compressed medium.
  • the medium can then relax, which significantly reduces the clamping pressure. If the medium used is a rubber-elastic body, it is created to widen the cavity to be moved wall section a significant friction that must be overcome to relax. In addition, this rubber-elastic body is subject to a high level of wear at this point because the rubbing surface wears away more and more. If the medium is viscous, there are sealing problems because leakage losses very quickly make the device ineffective. Therefore, this solution could not prevail for the rough handicraft business, especially when using cut-off machines on construction sites.
  • the device according to the invention with the features of independent claims 1 and 18, on the other hand, has the advantage of being much smoother and subject to less wear.
  • rolling elements as support means, very strong steel parts can be used for the device.
  • the way to release the clamping pressure for the disk-shaped tool is much less, which is why the clamping flanges can be relieved completely. This means that for the first time it is really possible to change the disc-shaped tool without additional hand tools.
  • a clamping device for cutting tools which sit between a flange designed as a bolt head and the end face of a spindle.
  • this tensioning device the tensioning force of an adjusting screw connected to the bolt head is transmitted to balls which support one another and are toggle-lever-like. These move under the clamping force across the axis of the set screw.
  • the outer balls are supported on an inclined surface of the spindle and are guided in a transverse bore of a part connected to the set screw. They convert their transverse movement into a movement of the part carrying the set screw parallel to the axis of the set screw, the cutting tool being clamped and held in a form-fitting manner.
  • the set screw or bolt head is turned counter to the clamping direction, the clamping pressure on the balls decreases. These move back automatically.
  • the set screw is necessary to generate and secure the clamping pressure, because without it the balls can escape from their clamping position.
  • FIG. 1 shows a first embodiment of a device according to the invention with a work spindle of a handheld power tool, partly in section
  • FIG. 2 shows a second embodiment of a device according to the invention at the end of a work spindle, in section
  • FIG. 3 shows a section III-III to FIG. 2
  • FIG. 1 shows a first embodiment of a device according to the invention with a work spindle of a handheld power tool, partly in section
  • FIG. 2 shows a second embodiment of a device according to the invention at the end of a work spindle, in section
  • FIG. 3 shows a section III-III to FIG. 2
  • FIG. 4 shows a section Section IV-IV to Figure 3
  • Figure 5 shows a longitudinal section through a multi-part clamping nut according to the invention according to a further embodiment
  • Figure 6 shows a section VI-VI to Figure 5
  • Figure 7 a section VII-VII to Figure 6
  • Figure 8 a section VIII -VIII to Figure 5
  • Figure 9 shows a section through a device according to the invention according to a further embodiment, with a clamping flange, a drive wheel for the tool and a machine-side lock for releasing the disk-shaped tool
  • Figure 10 is a view of another embodiment, partially cut after XX in Figure 11
  • Figure 11 is a plan view of Figure 10 in section 12 shows a section VII-VII to FIG. 10
  • FIG. 13 shows a section VIII-VIII to FIG. 11, FIG.
  • FIG. 14 shows a view of a clamping flange according to a further embodiment with rollers as support elements
  • FIG. 15 shows a side view of FIG. 14 in section
  • FIG. 16 a side view of FIG. 15,
  • FIG. 17 a section XVII-XVII of FIG. 15,
  • FIG. 18 a partial view XVIII-XVIII of FIG. 15,
  • FIG. 19 a view of a clamping nut according to a further embodiment with rollers
  • FIG. 20 a side view of FIG. 19 in section .
  • a work spindle 1 is provided with a threaded pin 2 and a collar 3.
  • a helical spring 5 is inserted into a central, axially running bore 4 of the work spindle 1.
  • a socket 6 is pressed together with a pin 7.
  • the pin has a head 8 inside the bore 4 and an actuating handle 9 outside.
  • a cross bore 10 in the threaded pin 2 cuts the bore 4.
  • This cross bore 10 serves as a guide for three balls 11, 11 '. The middle of these three, ball 11 ', is pressed by the coil spring 5 against the head 8 of the pin 7. It is aligned both with the bore 4 and with the transverse bore 10.
  • the two other balls 11 are located in the transverse bore 10 on both sides of this central ball 11 '. They protrude beyond the jacket of the threaded pin 2 by approximately half their diameter.
  • the outer balls 11 lie against a conical surface 13 in the clamping flange 12. This clamping flange 12 is thus axially supported and, with its end face 14 of a grinding wheel 15, offers a fixed contact.
  • a clamping nut 16 screwed onto the threaded pin 2 serves to clamp the grinding wheel 15.
  • FIG. 2 to 4 shows a device that works on the same principle as that of Figure 1.
  • a work spindle 17 has a head 18 and a threaded pin 19 thereon.
  • the head 18 is pierced transversely with two intersecting bores 20 and 21.
  • the bore 20 has a constant diameter and receives five balls 11, 11 '.
  • the middle of this, ball 11 ' lies directly in the axis of the work spindle 17.
  • the bore 21 is stepped in diameter. Part of the bore 21 receives a coil spring 22 and serves the middle ball 11 'as an escape space.
  • the other part of the bore 21 has a smaller diameter and a counterbore 23 on the outside.
  • a pin 24 is inserted into it, the inner end face of which is opposite the central ball 11 '.
  • a head 25 of the pin 24 is dimensioned so that it can dip into the depression 23.
  • the head 18 has a collar 26 directly adjacent to the bores 20 and 21.
  • a clamping sleeve 27 surrounds the head 18 in front of the collar 26. Its one annular end face lies against a grinding wheel 29 to be clamped.
  • Two ball pockets 31, a spring pocket 32 and a stepped pocket 33 are incorporated into the other annular end face 30 of the clamping sleeve 27.
  • the greater part of the pocket 33 serves the inclusion of the head 25, the smaller the access to the pin 24 so that it can be actuated from the outside.
  • a clamping nut 34 is screwed onto the threaded pin 19 and clamps the grinding wheel 29 against the clamping sleeve 27 with its flange 35.
  • the ball pockets 31 have inclined support surfaces 36.
  • the outer balls 11 rest on the inclined support surfaces 36 in the ball pockets 21. They are supported by the remaining balls 11.
  • the outer balls 11 support the clamping sleeve 27 against the clamping pressure of the flange 35 of the clamping nut 34.
  • Tightening takes place at the start of grinding. If the grinding wheel 29 is to be replaced, the middle balls 11 'are pressed out of the bore 20 into the bore 21 by means of the pin 24 and against the action of the helical spring 22 so that the outer balls 11 into the bore 20 into the clamping pressure can avoid the adapter sleeve 27. After loosening the clamping pressure in this way, the clamping nut 34 can easily be loosened again by hand. No additional tools are required to change the grinding wheel.
  • a clamping nut 37 designed according to the invention is shown and described.
  • a base body 38 is provided with three radial bores 39. These radial bores 39 are each intended to receive a pair of balls with an outer ball 40 and an inner ball 41.
  • annular Puncture 42 in the flange part of the base body 38, the inner part of the radial bores 39 is half open.
  • the recess 42 is then placed directly on a hub part 43 of the base body 38.
  • An axial bore of the base body 38 has a nut thread 44.
  • the hub part 43 carries a clamping flange 45 which is secured with an axial play on this hub part 43 by means of a ring 46.
  • the ring 46 is firmly pressed onto the hub part 43.
  • the clamping flange 45 has a hub 47, into which three pockets 48 with inclined surfaces 49 are incorporated. The position of these pockets coincides with the radial bores 39, so that the inner balls 41 can rest against the inclined surfaces 49 in the pockets 48.
  • Pockets 50 adjoin the outer part of the radial bores 39 and, starting from the radial bores 39 on the circumference of the base body 38, are machined in the loosening direction of the clamping nut 37. These pockets 50 can accommodate the outer balls 40. In them are springs 51, which always try to keep the outer balls 40 in their respective radial bore 39.
  • a ring 52 surrounds both the base body 38 and the clamping flange 45 and is provided with a ball groove 53. The ring 52 with the ball groove 53 also serves to guide the outer balls 40, which thus also axially secure the ring 52.
  • the clamping takes place in the manner already described for the previous exemplary embodiments, but against a normal clamping flange of the work spindle 1 or 17.
  • the clamping flange 45 of the clamping nut 37 is supported on its inclined surfaces 49 by the inner balls 41.
  • the outer balls 40 support the inner balls 41 and are supported on the ring 52.
  • the balls 40 are rolled into the pockets 50 against the action of the springs 51 and thus release the inner balls 41. This does not apply as a support for the clamping flange 45 and this is relieved of the clamping pressure.
  • the clamping nut 37 can thus be easily unscrewed from the work spindle by hand.
  • FIG. 9 shows, analogous to the multi-part chuck 37, a multi-part clamping flange 55 on a work spindle 54.
  • a base body 56 is fixedly connected to the work spindle 54 and is additionally axially supported by a snap ring 57.
  • the basic body 56 is basically constructed like the basic body 38. It has three radial bores 58 in which outer balls 40 and inner balls 41 are again guided.
  • the inner part of the radial bores 58 is opened by a recess 59, so that the inner balls 41 can protrude there.
  • a hub 60 of a support flange 61 which acts together with an adapter sleeve 62 on a grinding wheel, not shown here, similar to 15/29.
  • the support flange 61 and the clamping sleeve 62 are firmly connected to one another.
  • the clamping sleeve 62 also carries a bevel gear 63 for driving the grinding wheel.
  • the clamping disk 62 carries a ball bearing 64, via which it is mounted in the housing of the hand machine tool.
  • the base body 56 has pockets 65 on its outer circumference. These are incorporated starting from the radial bores 58 and extend in the release direction and are dimensioned such that they can accommodate the outer balls 40.
  • a ring 66 surrounds both the base body 56 and the support flange 61 and is provided with a ball groove 67. In addition, it has a bevel gear 68. Of course, instead of the bevel gear, only one or more grooves can be incorporated. This conical ring gear 68 or the grooves is juxtaposed with a lock 69 mounted in the machine housing.
  • pockets 70 with inclined support surfaces 71 which are assigned to the inner balls 41, are incorporated, as in the case of the multipart clamping nut 37.
  • a grinding wheel 15/29 is clamped by hand, as described earlier, by screwing on a simple clamping nut with a corresponding flange.
  • the clamping nut is also tightened by hand as far as possible. Correct clamping is done by operating the grinding wheel at the first load.
  • the lock 69 is inserted into the toothing of the bevel gear ring 68 and the ring 66 is thus fixed.
  • the operator now turns the grinding wheel 15/29 against its working direction.
  • the outer balls 40 roll into the pockets 65 against the action of the springs 51, as is described in detail with the pockets 50 in the previous exemplary embodiment.
  • the inner balls 41 can escape into the space made free by the outer balls 40 and thus give up their support function for the support flange 61.
  • the clamping pressure is eliminated and the clamping nut can be loosened again by hand.
  • FIGS. 10 to 13 A further embodiment of the device according to the invention using balls as rolling bodies is shown in FIGS. 10 to 13.
  • a support flange 73 is fastened on a work spindle 72, which is only indicated by dash-dotted lines. As shown in the previous exemplary embodiments, this has three at 120 ° to one another offset pockets 74 with inclined support surfaces 75.
  • the support flange 73 On a hub 76, the support flange 73 carries a clamping flange 77, which is held there by means of a locking ring 78 with axial play.
  • the clamping flange 77 has radial bores 79 opposite the pockets 74 in the support flange 73. As already described above, these accommodate balls 40 and 41.
  • the radial bores 79 are open on the inside towards the pockets 74 and on the outside towards the opposite end face of the clamping flange 77. This allows the inner balls 41 to exit to the pockets 74 and the outer balls 40 to exit in the opposite direction.
  • a profiled ring 80 surrounds the clamping flange 77. It also overlaps the end face of the clamping flange 77 to which the radial bores 79 for the outer balls 40 are open and serves these outer balls 40 as a stop. Screws 81 are screwed into threaded bores 82 in the end flange of the ring 80.
  • the grinding wheel is tightened after a clamping nut has been screwed onto the work spindle 72 and this clamping nut has been tightened by hand, due to the workload on the grinding wheel at the beginning of the first grinding process.
  • the fork 87 is pressed against the edge 88 and the end face of the clamping flange 77 which is adjacent to it. Now the grinding wheel is rotated until the grooves 86 lie opposite the ends of the fork 87. The fork ends can now fall into the grooves 86. They displace the ring 80 in the axial direction against the action of the coil springs 85.
  • the outer balls 40 initially roll away from their contact surface on the support flange 73, as a result of which the inner balls 41 can already somewhat avoid the clamping pressure of the support surface 75. As soon as the stage 89 in the ring 80 has moved past the outer balls 40, this has so much escape space that the clamping pressure can also be completely eliminated by dodging the inner balls 41.
  • the clamping nut can now be easily loosened by hand.
  • rollers are used as rolling bodies.
  • a base body 93 and a flange 94 which is connected to this base body 93 and is secured against rotation but with axial play are via two roller cages 95 with rollers 96 and a disc 97 inserted between these roller cages 95 supported against each other.
  • a number of pockets 98 with inclined surfaces 99 corresponding to the number of rollers 96 are incorporated.
  • the base body 93 has on a collar 100 projections 101 which engage in corresponding recesses 102 in the flange 94.
  • the cylindrical inner surface formed by these projections 101 and the flange parts next to the recesses 102 is provided with a groove 103, in which a spring ring 104 engages.
  • the spring ring 104 is narrower than the groove 103 at least by the axial play of the flange 94 relative to the base body 93. It thus holds the two parts together in the axial direction without impeding the action of the clamping flange 92.
  • a ring 105 is fixedly connected to the disk 97 and comprises both the base body 93 and the flange 94. Corresponding grooves in the base body 93 and in the flange 94 accommodate sealing rings 106, which protect the roller cages 95 against contamination.
  • a cover plate 107 serves as a screen to cover the projections 101 and the recesses 102.
  • At least one spring 108 rotates the roller cage 95, which can interact with the pockets 98, in a switched-on position toward a stop 109.
  • This stop 109 is firmly connected to the base body 93, which also carries an abutment 110 for the spring 108.
  • a work spindle 111 which carries the base body 93, is only indicated by dash-dotted lines. The clamping of a grinding wheel 15/29 with this clamping flange 92 also takes place in the manner described several times without tools.
  • all rollers 96 are supported on flat parts of them that are perpendicular to the axis of rotation assigned end faces ( Figures 15 and 17).
  • the ring 105 is rotated in the loosening direction when the grinding wheel is stationary (arrow 112).
  • the rollers 96 which are assigned to the pockets 98, roll on the flat parts of the end face of the base body 93 until they reach the inclined surfaces 99.
  • the clamping pressure for the grinding wheel is released.
  • the clamping nut can be loosened and unscrewed by hand.
  • a clamping nut 113 is constructed on the same principle as the multipart clamping flange 92 described above.
  • a base body 114 has a nut thread 115.
  • the hub of the base body 114 is flattened on both sides at its end and has mutually parallel surfaces 116.
  • a clamping flange 117 with a corresponding central recess with surfaces 118 parallel to one another is pushed onto this end. This results in a rotational positive connection between the base body 114 and the clamping flange 117.
  • a clamping ring 119 which is still pressed onto the hub of the base body 114, holds the base body 114 and the clamping flange 117 together in such a way that an axial play between the two parts remains sufficient for the clamping process.
  • Two roller cages 95 with rollers 96 and a washer 97 are also inserted between the flange 120 of the base body 114 and the clamping flange 117.
  • the pockets 98 with the inclined surfaces 99, the spring 108, the stop 109 and the abutment 110 are identical to those in the clamping flange 92.
  • the pockets etc. can be attached to both the base body 114 and the clamping flange 117.
  • the base body 114 is advantageously provided with pin holes 121, which make it possible to loosen it with a tool, if Rust or similar damage should make loosening difficult.
  • the disk 97 is firmly connected to a ring 122 here.
  • This ring 122 only overlaps the flange 120, the washer 97 and the roller cages 95 with the rollers 96.
  • the function of this clamping nut 113 corresponds to that of the clamping flange 92. In contrast, however, it has the advantage that it can be used immediately for retrofitting existing machines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Gripping On Spindles (AREA)

Description

Die Erfindung geht aus von einer Vorrichtung zum lösbaren Befestigen eines scheibenförmigen Werkzeugs nach der Gattung der unabhängigen Ansprüche 1 bzw. 18. Es ist schon eine solche Vorrichtung bekannt geworden, aus der DE-OS 29 37 045, bei der jedoch das Stützmittel in der Nutzung problematisch ist. Ein deformierbares Medium ist als Stützmittel zwischen zwei benachbarten, axial gegeneinander beweglichen Teilen - von denen eines dem Spannflansch zugeordnet ist - in einen von diesen Teilen mitgebildeten Hohlraum eingebracht. Beim Festspannen des scheibenförmigen Werkzeugs wird dieses Medium bis zur Grenze seiner Zusammendrückbarkeit zusammengepreßt. Für erleichtertes Lösen des Werkzeugs ist mindestens ein weiterer Wandabschnitt des genannten Hohlraums entgegen einer von der Reaktionskraft des zusammengedrückten Mediums nicht überwindbaren Rückhaltekraft willkürlich in eine den Hohlraum vergrößernde Lage bringbar. Das Medium kann sich dann entspannen, wodurch sich der Einspanndruck erheblich verringert. Handelt es sich bei dem verwendeten Medium um einen gummielastischen Körper, entsteht an dem zur Erweiterung des Hohlraums zu bewegenden Wandabschnitt eine erhebliche Reibung, die zum Entspannen überwunden werden muß. Außerdem unterliegt dieser gummielastische Körper an dieser Stelle einem hohen Verschleiß, weil sich die reibende Fläche immer weiter abradiert. Ist das Medium zähflüssig gibt es Dichtungsprobleme, weil Leckverluste sehr bald die Vorrichtung unwirksam machen. Für den rauhen Handwerksbetrieb, besonders beim Trennschleifereinsatz auf Baustellen, konnte sich diese Lösung deshalb nicht durchsetzen.The invention is based on a device for releasably fastening a disk-shaped tool according to the preamble of independent claims 1 and 18. Such a device has already become known from DE-OS 29 37 045, but in which the support means is used is problematic. A deformable medium is introduced as a support means between two adjacent, axially mutually movable parts - one of which is assigned to the clamping flange - into a cavity formed by these parts. When the disk-shaped tool is clamped, this medium is compressed to the limit of its compressibility. In order to facilitate the release of the tool, at least one further wall section of the cavity mentioned can be brought arbitrarily into a position that enlarges the cavity against a retention force that cannot be overcome by the reaction force of the compressed medium. The medium can then relax, which significantly reduces the clamping pressure. If the medium used is a rubber-elastic body, it is created to widen the cavity to be moved wall section a significant friction that must be overcome to relax. In addition, this rubber-elastic body is subject to a high level of wear at this point because the rubbing surface wears away more and more. If the medium is viscous, there are sealing problems because leakage losses very quickly make the device ineffective. Therefore, this solution could not prevail for the rough handicraft business, especially when using cut-off machines on construction sites.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorrichtung mit den Merkmalen der unabhängigen Ansprüche 1 bzw. 18 hat demgegenüber den Vorteil wesentlich leichtgängiger zu sein und einer geringeren Abnutzung zu unterliegen. Durch die Verwendung von Rollkörpern als Stützmittel können sehr feste Stahlteile für die Vorrichtung verwendet werden. Der Weg zum Lösen des Einspanndruckes für das scheibenförmige Werkzeug ist wesentlich geringer, weshalb die Spannflanschen vollständig entlastet werden können. Somit wird erstmals ein Wechsel des scheibenförmigen Werkzeugs wirklich ohne zusätzliches Handwerkzeug möglich.The device according to the invention with the features of independent claims 1 and 18, on the other hand, has the advantage of being much smoother and subject to less wear. By using rolling elements as support means, very strong steel parts can be used for the device. The way to release the clamping pressure for the disk-shaped tool is much less, which is why the clamping flanges can be relieved completely. This means that for the first time it is really possible to change the disc-shaped tool without additional hand tools.

Durch die in den abhängigen Ansprüchen 2-17, 25-28 bzw. 19-24 aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der in den Ansprüchen 1 bzw. 18 angegebenen Vorrichtung möglich. Besonders vorteilhaft, weil ohne Änderung bereits vorhandener Maschinen sofort einsetzbar, ist die mehrteilige Spannmutter, die einen Grundkörper und einen erfindungsgemäß bewegbaren Spannflansch umfaßt.Advantageous further developments and improvements of the device specified in claims 1 and 18 are possible through the measures listed in the dependent claims 2-17, 25-28 and 19-24. Particularly advantageous because it can be used immediately without changing existing machines is the multi-part clamping nut, which comprises a base body and a clamping flange that can be moved according to the invention.

Aus der US-PS 4 350 463 ist eine Spannvorrichtung für Schneidwerkzeuge bekannt, die zwischen einem als Bolzenkopf ausgebildeten Flansch und der Stirnseite einer Spindel sitzen. Bei dieser Spannvorrichtung wird die Spannkraft einer mit dem Bolzenkopf verbundenen Stellschraube auf sich aneinander verdrängend, kniehebelartig abstützende Kugeln übertragen. Diese bewegen sich unter der Spannkraft quer zur Achse der Stellschraube. Die äußeren Kugeln stützen sich an einer Schrägfläche der Spindel ab und sind dabei in einer Querbohrung eines mit der Stellschraube verbundenen Teils geführt. Ihre Querbewegung wandeln sie in eine Bewegung des die Stellschraube tragenden Teils parallel zur Achse der Stellschraube um, wobei das Schneidwerkzeug festgespannt und formschlüssig festgehalten wird. Beim Drehen der Stellschraube bzw. des Bolzenkopfes entgegen der Spannrichtung läßt der Spanndruck auf die Kugeln nach. Diese bewegen sich selbsttätig zurück.
Die Stellschraube ist zum Erzeugen und Sichern des Spanndruckes notwendig, weil ohne sie die Kugeln aus ihrer Spannstellung entweichen können.From US-PS 4,350,463 a clamping device for cutting tools is known, which sit between a flange designed as a bolt head and the end face of a spindle. In this tensioning device, the tensioning force of an adjusting screw connected to the bolt head is transmitted to balls which support one another and are toggle-lever-like. These move under the clamping force across the axis of the set screw. The outer balls are supported on an inclined surface of the spindle and are guided in a transverse bore of a part connected to the set screw. They convert their transverse movement into a movement of the part carrying the set screw parallel to the axis of the set screw, the cutting tool being clamped and held in a form-fitting manner. When the set screw or bolt head is turned counter to the clamping direction, the clamping pressure on the balls decreases. These move back automatically.
The set screw is necessary to generate and secure the clamping pressure, because without it the balls can escape from their clamping position.

Zum Lösen und Spannen der Stellschraube sind erhebliche Kräfte erforderlich, so daß ein gesondertes Schraubwerkzeug benötigt wird. Außerdem ist der Spann- und Lösevorgang verhältnismäßig zeitaufwendig. Ein schlagartiges, schnelles Lösen der Spannvorrichtung ist nicht möglich.Significant forces are required to loosen and tighten the set screw, so that a separate screwing tool is required. In addition, the tensioning and loosening process is relatively time consuming. Sudden, quick loosening of the tensioning device is not possible.

Zeichnungdrawing

Mehrere Ausführungsbeispiele des Erfindungsgegenstandes sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung mit einer Arbeitsspindel einer Handwerkzeugmaschine, teilweise im Schnitt, Figur 2 eine zweite Ausführungsform einer erfindungsgemäßen Vorrichtung am Ende einer Arbeitsspindel, im Schnitt, Figur 3 einen Schnitt III-III zu Figur 2, Figur 4 einen Schnitt IV-IV zu Figur 3, Figur 5 einen Längsschnitt durch eine erfindungsgemäße, mehrteilige Spannmutter nach einem weiteren Ausführungsbeispiel, Figur 6 einen Schnitt VI-VI zu Figur 5, Figur 7 einen Schnitt VII-VII zu Figur 6, Figur 8 einen Schnitt VIII-VIII zu Figur 5, Figur 9 einen Schnitt durch eine erfindungsgemäße Vorrichtung nach einer weiteren Ausführungsform, mit einem Spannflansch, einem Antriebsrad für das Werkzeug und einer maschinenseitigen Sperre zum Lösen des scheibenförmigen Werkzeugs, Figur 10 eine Ansicht eines weiteren Ausführungsbeispiels, teilweise geschnitten nach X-X in Figur 11, Figur 11 eine Draufsicht zu Figur 10 im Schnitt, Figur 12 einen Schnitt VII-VII zu Figur 10, Figur 13 einen Schnitt VIII-VIII zu Figur 11, Figur 14 eine Ansicht eines Spannflansches nach einer weiteren Ausführungsform mit Rollen als Stützelementen, Figur 15 eine Seitenansicht zu Figur 14 im Schnitt, Figur 16 eine Seitenansicht zu Figur 15, Figur 17 einen Schnitt XVII-XVII zu Figur 15, Figur 18 eine Teilansicht XVIII-XVIII zu Figur 15, Figur 19 eine Ansicht einer Spannmutter nach einer weiteren Ausführungsform mit Rollen und Figur 20 eine Seitenansicht zu Figur 19 im Schnitt.Several embodiments of the subject matter of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a first embodiment of a device according to the invention with a work spindle of a handheld power tool, partly in section, FIG. 2 shows a second embodiment of a device according to the invention at the end of a work spindle, in section, FIG. 3 shows a section III-III to FIG. 2, and FIG. 4 shows a section Section IV-IV to Figure 3, Figure 5 shows a longitudinal section through a multi-part clamping nut according to the invention according to a further embodiment, Figure 6 shows a section VI-VI to Figure 5, Figure 7 a section VII-VII to Figure 6, Figure 8 a section VIII -VIII to Figure 5, Figure 9 shows a section through a device according to the invention according to a further embodiment, with a clamping flange, a drive wheel for the tool and a machine-side lock for releasing the disk-shaped tool, Figure 10 is a view of another embodiment, partially cut after XX in Figure 11, Figure 11 is a plan view of Figure 10 in section 12 shows a section VII-VII to FIG. 10, FIG. 13 shows a section VIII-VIII to FIG. 11, FIG. 14 shows a view of a clamping flange according to a further embodiment with rollers as support elements, FIG. 15 shows a side view of FIG. 14 in section, FIG. 16 a side view of FIG. 15, FIG. 17 a section XVII-XVII of FIG. 15, FIG. 18 a partial view XVIII-XVIII of FIG. 15, FIG. 19 a view of a clamping nut according to a further embodiment with rollers and FIG. 20 a side view of FIG. 19 in section .

Beschreibung der AusführungsbeispieleDescription of the embodiments

Im Ausführungsbeispiel nach Figur 1 ist eine Arbeitsspindel 1 mit einem Gewindezapfen 2 und einem Bund 3 versehen. In eine zentrische, axial verlaufende Bohrung 4 der Arbeitsspindel 1 ist eine Schraubenfeder 5 eingesetzt. In den vorderen Teil dieser Bohrung 4 ist eine Buchse 6 zusammen mit einem Stift 7 eingepreßt. Dabei hat der Stift im innern der Bohrung 4 einen Kopf 8 und außerhalb eine Betätigungshandhabe 9. Eine Querbohrung 10 im Gewindezapfen 2 schneidet die Bohrung 4. Diese Querbohrung 10 dient drei Kugeln 11, 11' als Führung. Die mittlere dieser drei, Kugel 11', wird durch die Schraubenfeder 5 gegen den Kopf 8 des Stiftes 7 gedrückt. Sie fluchtet dabei sowohl mit der Bohrung 4 als auch mit der Querbohrung 10. Beiderseits dieser mittleren Kugel 11' liegen die beiden anderen Kugeln 11 in der Querbohrung 10. Sie überragen den Mantel des Gewindezapfens 2 mit etwa knapp der Hälfte ihres Durchmessers. Ein an dieser Stelle den Gewindezapfen 2 umschließender, topfförmiger Spannflansch 12 hält die Kugeln 11, 11' in der Querbohrung 10. Die äußeren Kugeln 11 liegen dabei an einer Kegelfläche 13 im Spannflansch 12 an. Dieser Spannflansch 12 ist somit axial abgestützt und bietet mit seiner Stirnfläche 14 einer Schleifscheibe 15 eine feste Anlage. Eine auf den Gewindezapfen 2 aufgeschraubte Spannmutter 16 dient zum Festspannen der Schleifscheibe 15.In the exemplary embodiment according to FIG. 1, a work spindle 1 is provided with a threaded pin 2 and a collar 3. A helical spring 5 is inserted into a central, axially running bore 4 of the work spindle 1. In the front part of this bore 4, a socket 6 is pressed together with a pin 7. The pin has a head 8 inside the bore 4 and an actuating handle 9 outside. A cross bore 10 in the threaded pin 2 cuts the bore 4. This cross bore 10 serves as a guide for three balls 11, 11 '. The middle of these three, ball 11 ', is pressed by the coil spring 5 against the head 8 of the pin 7. It is aligned both with the bore 4 and with the transverse bore 10. The two other balls 11 are located in the transverse bore 10 on both sides of this central ball 11 '. They protrude beyond the jacket of the threaded pin 2 by approximately half their diameter. A cup-shaped clamping flange 12, which surrounds the threaded pin 2 at this point, holds the balls 11, 11 'in the transverse bore 10. The outer balls 11 lie against a conical surface 13 in the clamping flange 12. This clamping flange 12 is thus axially supported and, with its end face 14 of a grinding wheel 15, offers a fixed contact. A clamping nut 16 screwed onto the threaded pin 2 serves to clamp the grinding wheel 15.

Nachdem der Gewindezapfen 2 Rechtsgewinde trägt, genügt es, die Spannmutter 16 mit der Hand festzuziehen. Das eigentliche Spannen erfolgt dann beim Schleifen mit der rechtsherum drehenden Schleifscheibe 15. Zum Lösen des Spanndrucks für das Wechseln der Schleifscheibe 15 drückt der Bedienende den Stift 7 ein. Damit drückt er die mittlere Kugel 11' ein Stück weit in den Raum, in den die Schraubenfeder 5 eingelegt ist. Die äußeren Kugeln 11 können dann den Druck des Spannflansches 12, der durch die Kegelfläche 13 auf sie wirkt, zur Mitte der Arbeitsspindel hin ausweichen. Damit wird die Spannmutter 16 so locker, daß sie der Bedienende von Hand abschrauben kann.After the threaded pin carries 2 right-hand threads, it is sufficient to tighten the clamping nut 16 by hand. The actual clamping then takes place during grinding with the grinding wheel 15 rotating to the right. The operator presses to release the clamping pressure for changing the grinding wheel 15 the pin 7. He thus pushes the middle ball 11 'a little way into the space in which the coil spring 5 is inserted. The outer balls 11 can then deflect the pressure of the clamping flange 12, which acts on them through the conical surface 13, towards the center of the work spindle. So that the clamping nut 16 is so loose that the operator can unscrew it by hand.

Das Ausführungsbeispiel nach den Figuren 2 bis 4 zeigt eine Vorrichtung, die nach dem gleichen Prinzip wie die nach Figur 1 arbeitet. Eine Arbeitsspindel 17 hat einen Kopf 18 und daran einen Gewindezapfen 19. Der Kopf 18 ist mit zwei sich schneidenden Bohrungen 20 und 21 quer durchbohrt. Die Bohrung 20 hat gleichbleibenden Durchmesser und nimmt fünf Kugeln 11, 11' auf. Die mittlere dieser, Kugel 11', liegt direkt in der Achse der Arbeitsspindel 17. Die Bohrung 21 ist im Durchmesser angestuft. Ein Teil der Bohrung 21 nimmt eine Schraubenfeder 22 auf und dient der mittleren Kugel 11' als Ausweichraum. Der andere Teil der Bohrung 21 hat einen kleineren Durchmesser und außen eine Senkung 23. In ihn ist ein Stift 24 eingeführt, dessen innere Stirnfläche der mittleren Kugel 11' gegenüber steht. Durch die Bohrung mit dem kleinen Durchmesser (21) kann die Kugel 11' aus der Bohrung 20 etwas ausweichen, so daß diese mit den anderen Kugeln 11 in der Bohrung 20 nicht ganz fluchtet. Dies ergibt eine Sicherung gegen unbeabsichtigtes Lösen bei Erschütterungen. Ein Kopf 25 des Stiftes 24 ist so bemessen, daß er in die Einsenkung 23 eintauchen kann. Der Kopf 18 hat einen Bund 26 direkt anschließend an die Bohrungen 20 und 21. Eine Spannhülse 27 umschließt den Kopf 18 vor dem Bund 26. Ihre eine ringförmige Stirnfläche liegt an einer zu spannenden Schleifscheibe 29 an. In die andere ringförmige Stirnfläche 30 der Spannhülse 27 sind zwei Kugeltaschen 31, eine Federtasche 32 und eine abgestufte Tasche 33 eingearbeitet. Der größere Teil der Tasche 33 dient dabei der Aufnahme des Kopfes 25, der kleinere dem Durchgriff zum Stift 24, um diesen von außen her betätigen zu können. Auf den Gewindezapfen 19 ist eine Spannmutter 34 aufgeschraubt, die mit ihrem Flansch 35 die Schleifscheibe 29 gegen die Spannhülse 27 festspannt. Die Kugeltaschen 31 haben schräge Stützflächen 36.The embodiment of Figures 2 to 4 shows a device that works on the same principle as that of Figure 1. A work spindle 17 has a head 18 and a threaded pin 19 thereon. The head 18 is pierced transversely with two intersecting bores 20 and 21. The bore 20 has a constant diameter and receives five balls 11, 11 '. The middle of this, ball 11 ', lies directly in the axis of the work spindle 17. The bore 21 is stepped in diameter. Part of the bore 21 receives a coil spring 22 and serves the middle ball 11 'as an escape space. The other part of the bore 21 has a smaller diameter and a counterbore 23 on the outside. A pin 24 is inserted into it, the inner end face of which is opposite the central ball 11 '. Through the bore with the small diameter (21), the ball 11 'can escape somewhat from the bore 20, so that it does not completely align with the other balls 11 in the bore 20. This provides protection against unintentional loosening in the event of vibrations. A head 25 of the pin 24 is dimensioned so that it can dip into the depression 23. The head 18 has a collar 26 directly adjacent to the bores 20 and 21. A clamping sleeve 27 surrounds the head 18 in front of the collar 26. Its one annular end face lies against a grinding wheel 29 to be clamped. Two ball pockets 31, a spring pocket 32 and a stepped pocket 33 are incorporated into the other annular end face 30 of the clamping sleeve 27. The greater part of the pocket 33 serves the inclusion of the head 25, the smaller the access to the pin 24 so that it can be actuated from the outside. A clamping nut 34 is screwed onto the threaded pin 19 and clamps the grinding wheel 29 against the clamping sleeve 27 with its flange 35. The ball pockets 31 have inclined support surfaces 36.

In der Normalstellung befinden sich die Kugeln 11, 11' in einer Reihe innerhalb der Bohrung 20. Die äußeren Kugeln 11 liegen an den schrägen Stützflächen 36 in den Kugeltaschen 21 an. Sie werden dabei abgestützt durch die übrigen Kugeln 11. So stützen die äußeren Kugeln 11 die Spannhülse 27 gegen den Spanndruck des Flansches 35 der Spannmutter 34 ab. Zum Festspannen der Schleifscheibe 29 genügt es auch hier, die Spannmutter 34 mit der Hand aufzuschrauben und anzuziehen. Das Festziehen erfolgt zu Beginn des Schleifens. Soll die Schleifscheibe 29 ausgewechselt werden, so drückt man mittels des Stiftes 24 und gegen die Wirkung der Schraubenfeder 22 die mittlere Kugeln 11' aus der Bohrung 20 so weit in die Bohrung 21 hinein, daß die äußeren Kugeln 11 in die Bohrung 20 hinein dem Spanndruck der Spannhülse 27 ausweichen können. Nach Lösen des Spanndruckes auf diese Weise, läßt sich die Spannmutter 34 leicht auch wieder mit der Hand lösen. Es bedarf zum Schleifscheibenwechsel also auch hier keines zusätzlichen Werkzeugs mehr.In the normal position, the balls 11, 11 'are in a row within the bore 20. The outer balls 11 rest on the inclined support surfaces 36 in the ball pockets 21. They are supported by the remaining balls 11. Thus, the outer balls 11 support the clamping sleeve 27 against the clamping pressure of the flange 35 of the clamping nut 34. To clamp the grinding wheel 29, it is also sufficient here to screw on and tighten the clamping nut 34 by hand. Tightening takes place at the start of grinding. If the grinding wheel 29 is to be replaced, the middle balls 11 'are pressed out of the bore 20 into the bore 21 by means of the pin 24 and against the action of the helical spring 22 so that the outer balls 11 into the bore 20 into the clamping pressure can avoid the adapter sleeve 27. After loosening the clamping pressure in this way, the clamping nut 34 can easily be loosened again by hand. No additional tools are required to change the grinding wheel.

Im Ausführungsbeispiel nach den Figuren 5 bis 8 ist eine erfindungsgemäß ausgebildete Spannmutter 37 gezeigt und beschrieben. Ein Grundkörper 38 ist mit drei Radialbohrungen 39 versehen. Diese Radialbohrungen 39 sind zur Aufnahme je eines Kugelpaares mit einer äußeren Kugel 40 und einer inneren Kugel 41 bestimmt. Durch einen axial gerichteten, ringförmigen Einstich 42 in den Flanschteil des Grundkörpers 38 ist der innere Teil der Radialbohrungen 39 halb offen. Dabei ist der Einstich 42 direkt an einen Nabenteil 43 des Grundkörpers 38 anschließend gelegt. Eine Axialbohrung des Grundkörpers 38 hat ein Muttergewinde 44. Der Nabenteil 43 trägt einen Spannflansch 45, der durch einen Ring 46 auf diesem Nabenteil 43 mit Axialspiel gesichert ist. Der Ring 46 ist fest aufgepreßt auf den Nabenteil 43. Der Spannflansch 45 hat eine Nabe 47, in die drei Taschen 48 mit Schrägflächen 49 eingearbeitet sind. Diese Taschen stimmen in ihrer Lage überein mit den Radialbohrungen 39, so daß die inneren Kugeln 41 an den Schrägflächen 49 in den Taschen 48 anliegen können. An den äußeren Teil der Radialbohrungen 39 schließen sich Taschen 50 an, die am Umfang des Grundkörpers 38 von den Radialbohrungen 39 ausgehend, in Löserichtung der Spannmutter 37 verlaufend eingearbeitet sind. Diese Taschen 50 können die äußeren Kugeln 40 aufnehmen. In ihnen liegen Federn 51, die die äußeren Kugeln 40 stets in ihrer jeweiligen Radialbohrung 39 zu halten suchen. Ein Ring 52 umschließt sowohl den Grundkörper 38 als auch den Spannflansch 45 und ist mit einer Kugelrinne 53 versehen. Der Ring 52 mit der Kugelrinne 53 dient auch der Führung der äußeren Kugeln 40, die damit zugleich auch den Ring 52 axial sichern.In the exemplary embodiment according to FIGS. 5 to 8, a clamping nut 37 designed according to the invention is shown and described. A base body 38 is provided with three radial bores 39. These radial bores 39 are each intended to receive a pair of balls with an outer ball 40 and an inner ball 41. By an axially directed, annular Puncture 42 in the flange part of the base body 38, the inner part of the radial bores 39 is half open. The recess 42 is then placed directly on a hub part 43 of the base body 38. An axial bore of the base body 38 has a nut thread 44. The hub part 43 carries a clamping flange 45 which is secured with an axial play on this hub part 43 by means of a ring 46. The ring 46 is firmly pressed onto the hub part 43. The clamping flange 45 has a hub 47, into which three pockets 48 with inclined surfaces 49 are incorporated. The position of these pockets coincides with the radial bores 39, so that the inner balls 41 can rest against the inclined surfaces 49 in the pockets 48. Pockets 50 adjoin the outer part of the radial bores 39 and, starting from the radial bores 39 on the circumference of the base body 38, are machined in the loosening direction of the clamping nut 37. These pockets 50 can accommodate the outer balls 40. In them are springs 51, which always try to keep the outer balls 40 in their respective radial bore 39. A ring 52 surrounds both the base body 38 and the clamping flange 45 and is provided with a ball groove 53. The ring 52 with the ball groove 53 also serves to guide the outer balls 40, which thus also axially secure the ring 52.

Das Festspannen erfolgt in der bereits zu den vorhergehenden Ausführungsbeispielen geschilderten Weise aber gegen einen normalen Spannflansch der Arbeitsspindel 1 oder 17. Dabei wird der Spannflansch 45 der Spannmutter 37 durch die inneren Kugeln 41 an seinen Schrägflächen 49 abgestützt. Die äußeren Kugeln 40 stützen die inneren Kugeln 41 und stützen sich dabei am Ring 52 ab. Zum Lösen der Spannverbindung wird der Ring 52 in Löserichtung gedreht. Dabei werden die Kugeln 40 gegen die Wirkung der Federn 51 in die Taschen 50 hineingerollt und geben so die inneren Kugeln 41 frei. Dabei entfallen diese als Stütze für den Spannflansch 45 und dieser wird vom Spanndruck entlastet. Die Spannmutter 37 kann so leicht von Hand von der Arbeitsspindel abgeschraubt werden. Am Ende nehmen die Kugeln 40 und 41 unter der Wirkung der Federn 51 wieder ihre Spannstellung ein. Ein Ausführungsbeispiel nach Figur 9 zeigt analog zum mehrteiligen Spannfutter 37 auf einer Arbeitsspindel 54 einen mehrteiligen Spannflansch 55. Ein Grundkörper 56 ist fest verbunden mit der Arbeitsspindel 54 und zusätzlich durch einen Sprengring 57 axial abgestützt. Der Grundkörper 56 ist prinzipiell so aufgebaut wie der Grundkörper 38. Er besitzt drei Radialbohrungen 58 in denen wieder äußere Kugeln 40 und innere Kugeln 41 geführt sind. Auch hier ist der innere Teil der Radialbohrungen 58 durch einen Einstich 59 geöffnet, so daß dort die inneren Kugeln 41 herausragen können. In den Einstich 59 ragt eine Nabe 60 eines Stützflansches 61, der mit einer Spannhülse 62 zusammen auf eine hier nicht dargestellte Schleifscheibe ähnlich 15/29 einwirkt. Der Stützflansch 61 und die Spannhülse 62 sind fest miteinander verbunden. Außerdem trägt die Spannhülse 62 noch ein Kegelzahnrad 63 für den Antrieb der Schleifscheibe. Schließlich trägt die Spannscheibe 62 ein Kugellager 64, über das sie im Gehäuse der Handwerkzeugmaschine gelagert ist. Der Grundkörper 56 besitzt an seinem Außenumfang Taschen 65. Diese sind von den Radialbohrungen 58 ausgehend in Löserichtung verlaufend eingearbeitet und so bemessen, daß sie die äußeren Kugeln 40 aufnehmen können. Auch in diese Taschen 65 sind Federn 51 eingelegt, die die äußeren Kugeln 40 stets in ihrer jeweiligen Radialbohrung 58 zu halten suchen. Ein Ring 66 umschließt sowohl den Grundkörper 56 als auch den Stützflansch 61 und ist mit einer Kugelrinne 67 versehen. Außerdem besitzt er einen Kegelzahnkranz 68. Selbstverständlich können anstelle des Kegelzahnkranzes auch nur eine oder mehrere Nuten eingearbeitet sein. Diesem Kegelzahnkranz 68 oder den Nuten ist ein im Maschinengehäuse gelagerter Feststeller 69 gegenübergestellt. In die Nabe 60 des Stützflansches 61 sind wie bei der mehrteiligen Spannmutter 37 Taschen 70 mit schrägen Stützflächen 71 eingearbeitet, die den inneren Kugeln 41 zugeordnet sind.The clamping takes place in the manner already described for the previous exemplary embodiments, but against a normal clamping flange of the work spindle 1 or 17. The clamping flange 45 of the clamping nut 37 is supported on its inclined surfaces 49 by the inner balls 41. The outer balls 40 support the inner balls 41 and are supported on the ring 52. For loosening the tension connection the ring 52 is rotated in the release direction. The balls 40 are rolled into the pockets 50 against the action of the springs 51 and thus release the inner balls 41. This does not apply as a support for the clamping flange 45 and this is relieved of the clamping pressure. The clamping nut 37 can thus be easily unscrewed from the work spindle by hand. At the end, the balls 40 and 41 return to their tensioned position under the action of the springs 51. An embodiment according to FIG. 9 shows, analogous to the multi-part chuck 37, a multi-part clamping flange 55 on a work spindle 54. A base body 56 is fixedly connected to the work spindle 54 and is additionally axially supported by a snap ring 57. The basic body 56 is basically constructed like the basic body 38. It has three radial bores 58 in which outer balls 40 and inner balls 41 are again guided. Here, too, the inner part of the radial bores 58 is opened by a recess 59, so that the inner balls 41 can protrude there. In the recess 59 protrudes a hub 60 of a support flange 61 which acts together with an adapter sleeve 62 on a grinding wheel, not shown here, similar to 15/29. The support flange 61 and the clamping sleeve 62 are firmly connected to one another. In addition, the clamping sleeve 62 also carries a bevel gear 63 for driving the grinding wheel. Finally, the clamping disk 62 carries a ball bearing 64, via which it is mounted in the housing of the hand machine tool. The base body 56 has pockets 65 on its outer circumference. These are incorporated starting from the radial bores 58 and extend in the release direction and are dimensioned such that they can accommodate the outer balls 40. Springs 51 are also inserted into these pockets 65, and the outer balls 40 are always in their respective radial bores 58 looking to keep. A ring 66 surrounds both the base body 56 and the support flange 61 and is provided with a ball groove 67. In addition, it has a bevel gear 68. Of course, instead of the bevel gear, only one or more grooves can be incorporated. This conical ring gear 68 or the grooves is juxtaposed with a lock 69 mounted in the machine housing. In the hub 60 of the support flange 61, pockets 70 with inclined support surfaces 71, which are assigned to the inner balls 41, are incorporated, as in the case of the multipart clamping nut 37.

Das Spannen einer Schleifscheibe 15/29 geschieht wie bereits früher beschrieben hier durch Aufschrauben einer einfachen Spannmutter mit einem entsprechenden Flansch von Hand. Die Spannmutter wird auch von Hand soweit wie möglich festgezogen. Das richtige Festspannen geschieht durch den Betrieb der Schleifscheibe bei der ersten Belastung. Zum Lösen der Spannverbindung für einen Schleifscheibenwechsel wird der Feststeller 69 in die Verzahnung des Kegelzahnkranzes 68 eingerückt und so der Ring 66 festgelegt. Der Bedienende dreht nun die Schleifscheibe 15/29 entgegen ihrer Arbeitsrichtung. Dadurch rollen die äußeren Kugeln 40 gegen die Wirkung der Federn 51 in die Taschen 65, wie es zum vorhergehenden Ausführungsbeispiel mit den Taschen 50 ausführlich beschrieben ist. Die inneren Kugeln 41 können in den durch die äußeren Kugeln 40 freigemachten Raum ausweichen und so ihre Stützfunktion für den Stützflansch 61 aufgeben. Der Spanndruck fällt weg und die Spannmutter kann von Hand wieder gelöst werden.A grinding wheel 15/29 is clamped by hand, as described earlier, by screwing on a simple clamping nut with a corresponding flange. The clamping nut is also tightened by hand as far as possible. Correct clamping is done by operating the grinding wheel at the first load. To release the clamping connection for a grinding wheel change, the lock 69 is inserted into the toothing of the bevel gear ring 68 and the ring 66 is thus fixed. The operator now turns the grinding wheel 15/29 against its working direction. As a result, the outer balls 40 roll into the pockets 65 against the action of the springs 51, as is described in detail with the pockets 50 in the previous exemplary embodiment. The inner balls 41 can escape into the space made free by the outer balls 40 and thus give up their support function for the support flange 61. The clamping pressure is eliminated and the clamping nut can be loosened again by hand.

Eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung unter Verwendung von Kugeln als Rollkörper zeigen die Figuren 10 bis 13. Auf einer nur strichpunktiert angedeuteten Arbeitspindel 72 ist ein Stützflansch 73 befestigt. Dieser besitzt wie in den vorhergehenden Ausführungsbeispielen gezeigt drei um 120° gegeneinander versetzte Taschen 74 mit schrägen Stützflächen 75. Auf einer Nabe 76 trägt der Stützflansch 73 einen Spannflansch 77, der mittels eines Sicherungsringes 78 mit Axialspiel dort gehalten ist. Der Spannflansch 77 besitzt den Taschen 74 im Stützflansch 73 gegenübergestellte Radialbohrungen 79. Diese nehmen wie bereits vorstehend geschildert Kugeln 40 und 41 auf. Die Radialbohrungen 79 sind innen zu den Taschen 74 hin, außen zur entgegengesetzten Stirnfläche des Spannflansches 77 hin seitlich geöffnet. So wird den inneren Kugeln 41 ein Austreten zu den Taschen 74, den äußeren Kugeln 40 ein Austreten in entgegengesetzter Richtung ermöglicht. Ein profilierter Ring 80 umschließt den Spannflansch 77. Er übergreift auch die Stirnseite des Spannflansches 77 zu der hin die Radialbohrungen 79 für die äußeren Kugeln 40 geöffnet sind und dient diesen äußeren Kugeln 40 als Anschlag. Schrauben 81 sind in Gewindebohrungen 82 im Stirnflansch des Ringes 80 eingeschraubt. Sie durchgreifen Durchgangsbohrungen 83 und Senkungen 84 im Spannflansch 77, wobei in die Senkungen 84 unter die Köpfe der Schrauben 81 Schraubenfedern 85 eingebracht sind. Die Schraubenfedern 85 suchen so den Ring 80 in axialer Richtung stets am Spannflansch 77 anliegend zu halten. In die Stirnfläche des Spannflansches 77, in die auch die Senkungen 84 eingebracht sind, sind zwei in diagonaler Richtung verlaufende Nuten 86 eingearbeitet. In sie kann eine nur mit ihren Enden strichpunktiert angedeutete Gabel 87 eintauchen, die auch an einem Stirnrand 88 des Ringes 80 anliegen kann. Die Innenfläche des Ringes 80 ist abgestuft bei 89. Die entstandene innere Zylinderfläche hat axial verlaufende Rinnen 90. Diese nehmen in Spannstellung der Vorrichtung die äußeren Kugeln 40. Die so entstandene äußere Zylinderfläche 91 läßt in Lösestellung des Ringes 80 den äußeren Kugeln 40 Spiel, um dem Spanndruck auszuweichen, der durch die inneren Kugeln 41 auf sie wirkt.A further embodiment of the device according to the invention using balls as rolling bodies is shown in FIGS. 10 to 13. A support flange 73 is fastened on a work spindle 72, which is only indicated by dash-dotted lines. As shown in the previous exemplary embodiments, this has three at 120 ° to one another offset pockets 74 with inclined support surfaces 75. On a hub 76, the support flange 73 carries a clamping flange 77, which is held there by means of a locking ring 78 with axial play. The clamping flange 77 has radial bores 79 opposite the pockets 74 in the support flange 73. As already described above, these accommodate balls 40 and 41. The radial bores 79 are open on the inside towards the pockets 74 and on the outside towards the opposite end face of the clamping flange 77. This allows the inner balls 41 to exit to the pockets 74 and the outer balls 40 to exit in the opposite direction. A profiled ring 80 surrounds the clamping flange 77. It also overlaps the end face of the clamping flange 77 to which the radial bores 79 for the outer balls 40 are open and serves these outer balls 40 as a stop. Screws 81 are screwed into threaded bores 82 in the end flange of the ring 80. They pass through through bores 83 and depressions 84 in the clamping flange 77, 81 helical springs 85 being introduced into the depressions 84 under the heads of the screws 81. The coil springs 85 thus always seek to hold the ring 80 in the axial direction in contact with the clamping flange 77. Two grooves 86 running in the diagonal direction are machined into the end face of the clamping flange 77, into which the depressions 84 are also introduced. A fork 87, indicated by dash-dotted lines only, can dip into it, which can also rest against an end edge 88 of the ring 80. The inner surface of the ring 80 is graduated at 89. The inner cylinder surface formed has axially extending grooves 90. These take the outer balls 40 in the clamping position of the device outer cylinder surface 91 leaves the outer balls 40 play in the release position of the ring 80 in order to avoid the clamping pressure which acts on them through the inner balls 41.

Auch bei dieser Ausführungsform der erfindungsgemäßen Vorrichtung erfolgt das Festspannen einer Schleifscheibe nach dem Aufschrauben einer Spannmutter auf die Arbeitsspindel 72 und Festziehen dieser Spannmutter von Hand, durch die Arbeitsbelastung der Schleifscheibe zu Beginn des ersten Schleifvorganges.In this embodiment of the device according to the invention, the grinding wheel is tightened after a clamping nut has been screwed onto the work spindle 72 and this clamping nut has been tightened by hand, due to the workload on the grinding wheel at the beginning of the first grinding process.

Um die Schleifscheibe zu wechseln drückt man die Gabel 87 an den Rand 88 und die diesem benachbarte Stirnfläche des Spannflansches 77. Nun dreht man die Schleifscheibe so lange, bis die Nuten 86 den Enden der Gabel 87 gegenüberliegen. Die Gabelenden können nun in die Nuten 86 einfallen. Sie verdrängen dabei den Ring 80 in axialer Richtung gegen die Wirkung der Schraubenfedern 85. Dabei rollen die äußeren Kugeln 40 zunächst weg von ihrer Anlagefläche am Stützflansch 73, wodurch die inneren Kugeln 41 bereits dem Spanndruck der Stützfläche 75 etwas ausweichen können. Sobald die Stufe 89 im Ring 80 an den äußeren Kugeln 40 vorbeibewegt ist, hat diese so viel Ausweichraum, daß der Spanndruck durch ausweichen auch der inneren Kugeln 41 völlig aufgehoben werden kann. Die Spannmutter läßt sich nun leicht mit der Hand lösen.In order to change the grinding wheel, the fork 87 is pressed against the edge 88 and the end face of the clamping flange 77 which is adjacent to it. Now the grinding wheel is rotated until the grooves 86 lie opposite the ends of the fork 87. The fork ends can now fall into the grooves 86. They displace the ring 80 in the axial direction against the action of the coil springs 85. The outer balls 40 initially roll away from their contact surface on the support flange 73, as a result of which the inner balls 41 can already somewhat avoid the clamping pressure of the support surface 75. As soon as the stage 89 in the ring 80 has moved past the outer balls 40, this has so much escape space that the clamping pressure can also be completely eliminated by dodging the inner balls 41. The clamping nut can now be easily loosened by hand.

Im nächsten Ausführungsbeispiel nach den Figuren 14 bis 18 sind als Rollkörper Rollen eingesetzt. In dieser Version mit einem mehrteiligen Spannflansch 92 sind ein Grundkörper 93 und ein mit diesem Grundkörper 93 verdrehungssicher aber mit Axialspiel verbundener Flansch 94 über zwei Rollenkäfige 95 mit Rollen 96 und eine zwischen diese Rollenkäfige 95 eingefügte Scheibe 97 gegeneinander abgestützt. In die den Rollen 96 zugewendete Stirnfläche des Grund körpers 93 sind eine der Anzahl der Rollen 96 entsprechende Anzahl von Taschen 98 mit Schrägflächen 99 eingearbeitet. Der Grundkörper 93 besitzt an einem Bund 100 Vorsprünge 101, die in entsprechende Ausnehmungen 102 im Flansch 94 eingreifen. Die durch diese Vorsprünge 101 und die Flanschteile neben den Ausnehmungen 102 gebildete, zylindrische Innenfläche ist mit einer Nut 103 versehen, in die ein Federring 104 eingreift. Der Federring 104 ist mindestens um das Axialspiel des Flansches 94 gegenüber dem Grundkörper 93 schmaler als die Nut 103. Er hält so die beiden Teile in axialer Richtung zusammen, ohne die Wirkung des Spannflanches 92 zu behindern. Mit der Scheibe 97 ist ein Ring 105 fest verbunden, der sowohl den Grundkörper 93 als auch den Flansch 94 umfaßt. Entsprechende Nuten im Grundkörper 93 und im Flansch 94 nehmen Dichtringe 106 auf, die die Rollenkäfige 95 vor Verschmutzung schützen. Eine Abdeckscheibe 107 dient als Sichtblende, um die Vorsprünge 101 und die Ausnehmungen 102 abzudecken. Mindestens eine Feder 108 drängt den Rollenkäfig 95, der mit den Taschen 98 zusammenwirken kann, drehend in eine Einschaltstellung zu einem Anschlag 109 hin. Dieser Anschlag 109 ist fest verbunden mit dem Grundkörper 93, der auch ein Widerlager 110 für die Feder 108 trägt. Eine Arbeitsspindel 111, die den Grundkörper 93 trägt, ist nur strichpunktiert angedeutet. Das Festspannen einer Schleifscheibe 15/29 mit diesem Spannflansch 92 geschieht ebenfalls in der schon mehrfach beschriebenen Weise ohne Werkzeug. Im Spannzustand stützen sich alle Rollen 96 an ebenen, senkrecht zur Drehachse stehenden Teilen der ihnen zugeordneten Stirnflächen ab (Figuren 15 und 17). Soll die Schleifscheibe ausgewechselt werden, so dreht man bei stillstehender Schleifscheibe den Ring 105 in Löserichtung (Pfeil 112). Dabei rollen die Rollen 96, die den Taschen 98 zugeordnet sind, solange auf den ebenen Teilen der Stirnfläche des Grundkörpers 93 ab, bis sie die Schrägflächen 99 erreichen. Beim Eintreten der Rollen in die Taschen 98 wird der Spanndruck für die Schleifscheibe aufgehoben. Die Spannmutter kann von Hand wieder gelöst und abgeschraubt werden.In the next exemplary embodiment according to FIGS. 14 to 18, rollers are used as rolling bodies. In this version with a multi-part clamping flange 92, a base body 93 and a flange 94 which is connected to this base body 93 and is secured against rotation but with axial play are via two roller cages 95 with rollers 96 and a disc 97 inserted between these roller cages 95 supported against each other. In the end face of the base body 93 facing the rollers 96, a number of pockets 98 with inclined surfaces 99 corresponding to the number of rollers 96 are incorporated. The base body 93 has on a collar 100 projections 101 which engage in corresponding recesses 102 in the flange 94. The cylindrical inner surface formed by these projections 101 and the flange parts next to the recesses 102 is provided with a groove 103, in which a spring ring 104 engages. The spring ring 104 is narrower than the groove 103 at least by the axial play of the flange 94 relative to the base body 93. It thus holds the two parts together in the axial direction without impeding the action of the clamping flange 92. A ring 105 is fixedly connected to the disk 97 and comprises both the base body 93 and the flange 94. Corresponding grooves in the base body 93 and in the flange 94 accommodate sealing rings 106, which protect the roller cages 95 against contamination. A cover plate 107 serves as a screen to cover the projections 101 and the recesses 102. At least one spring 108 rotates the roller cage 95, which can interact with the pockets 98, in a switched-on position toward a stop 109. This stop 109 is firmly connected to the base body 93, which also carries an abutment 110 for the spring 108. A work spindle 111, which carries the base body 93, is only indicated by dash-dotted lines. The clamping of a grinding wheel 15/29 with this clamping flange 92 also takes place in the manner described several times without tools. In the tensioned state, all rollers 96 are supported on flat parts of them that are perpendicular to the axis of rotation assigned end faces (Figures 15 and 17). If the grinding wheel is to be replaced, the ring 105 is rotated in the loosening direction when the grinding wheel is stationary (arrow 112). The rollers 96, which are assigned to the pockets 98, roll on the flat parts of the end face of the base body 93 until they reach the inclined surfaces 99. When the rollers enter pockets 98, the clamping pressure for the grinding wheel is released. The clamping nut can be loosened and unscrewed by hand.

Nach dem gleichen Prinzip wie der vorbeschriebene, mehrteilige Spannflansch 92, ist eine Spannmutter 113 aufgebaut. Ein Grundkörper 114 besitzt ein Muttergewinde 115. Die Nabe des Grundkörpers 114 ist an ihrem Ende beidseitig abgeflacht und hat einander parallel gegenüberliegende Flächen 116. Auf dieses Ende ist ein Spannflansch 117 mit einer entsprechenden zentralen Ausnehmung mit zueinander parallelen Flächen 118 aufgeschoben. Daraus ergibt sich ein Drehformschluß zwischen dem Grundkörper 114 und dem Spannflansch 117. Ein noch auf die Nabe des Grundkörpers 114 aufgepreßter Klemmring 119 hält den Grundkörper 114 und den Spannflansch 117 so zusammen, daß ein für den Spannvorgang ausreichendes Axialspiel zwischen den beiden Teilen bleibt. Zwischen den Flansch 120 des Grundkörpers 114 und dem Spannflansch 117 sind ebenfalls zwei Rollenkäfige 95 mit Rollen 96 und eine Scheibe 97 eingesetzt. Die Taschen 98 mit den Schrägflächen 99, die Feder 108, der Anschlag 109 und das Widerlager 110 sind identisch denen im Spannflansch 92. Dabei können die Taschen usw. sowohl am Grundkörper 114 als auch am Spannflansch 117 angebracht sein. Vorteilhafterweise ist der Grundkörper 114 sicherheitshalber mit Stiftlöchern 121 versehen, die ein Lösen mit Werkzeug möglich machen, falls Rost oder dergleichen Schäden das Lösen erschweren sollten. Die Scheibe 97 ist hier mit einem Ring 122 fest verbunden. Dieser Ring 122 übergreift nur den Flansch 120, die Scheibe 97 und die Rollenkäfige 95 mit den Rollen 96. Die Funktion dieser Spannmutter 113 entspricht der des Spannflansches 92. Sie hat demgegenüber aber den Vorteil, zur Nachrüstung bereits vorhandener Maschinen sofort einsetzbar zu sein.A clamping nut 113 is constructed on the same principle as the multipart clamping flange 92 described above. A base body 114 has a nut thread 115. The hub of the base body 114 is flattened on both sides at its end and has mutually parallel surfaces 116. A clamping flange 117 with a corresponding central recess with surfaces 118 parallel to one another is pushed onto this end. This results in a rotational positive connection between the base body 114 and the clamping flange 117. A clamping ring 119, which is still pressed onto the hub of the base body 114, holds the base body 114 and the clamping flange 117 together in such a way that an axial play between the two parts remains sufficient for the clamping process. Two roller cages 95 with rollers 96 and a washer 97 are also inserted between the flange 120 of the base body 114 and the clamping flange 117. The pockets 98 with the inclined surfaces 99, the spring 108, the stop 109 and the abutment 110 are identical to those in the clamping flange 92. The pockets etc. can be attached to both the base body 114 and the clamping flange 117. For safety's sake, the base body 114 is advantageously provided with pin holes 121, which make it possible to loosen it with a tool, if Rust or similar damage should make loosening difficult. The disk 97 is firmly connected to a ring 122 here. This ring 122 only overlaps the flange 120, the washer 97 and the roller cages 95 with the rollers 96. The function of this clamping nut 113 corresponds to that of the clamping flange 92. In contrast, however, it has the advantage that it can be used immediately for retrofitting existing machines.

Claims (28)

  1. Device for detachably fastening a disc-shaped tool (15, 29) on a work spindle (1, 17, 54), comprising two flanges (12, 16, 27, 35, 45, 55, 77) which bear frictionally against the tool (15, 29) and of which one forms a clamp flange (12, 27, 45, 55, 77) which, with the aid of an operating member (7, 24, 52, 66, 80), can be relieved of the clamping pressure for the tool (15, 29) by the release of a support means (11, 41) securing it against axial displacement on the work spindle (1, 17, 54), characterized in that support means, which are introduced into a space between the work spindle (1, 17), or an intermediate member (38, 56, 73) axially immovably connected to it, and the clamp flange (12, 27, 45, 55, 77) and which are in the form of at least one first and one second rolling body (11, 11', 40, 41), can move transversely to the direction of their support into an escape space (4, 10, 20, 21, 39, 50, 58, 65), said rolling bodies (11, 11', 40, 41) being guided in a transverse bore (10, 20, 39, 58, 79) in the work spindle (1, 17) or in the intermediate member (38, 56, 73), while the at least one first rolling body (11, 41) lies in its support position against a surface (13, 36, 49, 71, 75) which on the clamp flange (12, 27, 45, 61, 73) is inclined relative to the clamping plane, and the at least one second rolling body (11', 40) in its support position supports the at least one first rolling body (11, 41), the at least one second rolling body (11', 40) being disposed in each case facing an escape bore (4, 21, 50) and - for the purpose of releasing the clamping pressure by hand with the aid of the operating member (7, 24, 52, 66, 80), particularly from the outside without an auxiliary tool - being able to be forced out of its support position for one of the at least one first rolling bodies (11, 41) and into the escape bore (4, 21, 50) against the action of a spring (5, 22, 85), in order thus to release at least a part of the space hitherto occupied by it to serve as an escape space for the at least one first rolling body (11, 41) previously supported by it.
  2. Device according to Claim 1, characterized in that the rolling bodies (11, 40, 41, 96) are subjected to the action of at least one spring (5, 22, 51, 85, 108) which continuously forces them into their support position, and in that the cavity is a transverse bore (10, 20, 39, 58, 79).
  3. Device according to Claim 2, characterized in that, by means of a release pin (7, 24) which can be operated from the outside, the rolling body (11) which adjoins said pin and which is in the form of a ball (40, 41) or a roller (96) can be moved into the escape bore (4, 21) adjoining it.
  4. Device according to Claim 3, characterized in that the escape bore is an axial bore (4) which is formed in the work spindle (1) and which is in line with a co-directional release pin (7) and with another axial bore (4) guiding the latter.
  5. Device according to Claim 3, characterized in that the escape bore is a radial bore (21) which is formed in the work spindle (17) and which is in line with a codirectional release pin (24) and with another radial bore (21, 23) guiding the latter.
  6. Device according to one of Claims 1 to 3, characterized in that the inclined surface (36, 49, 71, 75) is formed on one of the clamp flanges (27, 45, 61, 73) in a socket (31, 48, 70, 74) in said clamp flange (27, 45, 61, 73).
  7. Device according to Claim 6, characterized in that the clamp flange (27, 45, 61, 73) has a plurality of sockets (31, 48, 70, 74) having an inclined surface (36, 49, 71, 75), and correspondingly the work spindle (17) or the intermediate member (38, 56, 77) joined firmly to it has a plurality of transverse bores (20, 39, 58, 79) containing support balls (11, 40, 41).
  8. Device according to one of Claims 1 to 3, characterized in that one of the clamp flanges is a part of a multi-part clamp nut (37) which consists of a main body (38) having an internal screw thread (44), a clamp flange (45) carried by a hub part (43) of said main body (38), a ring (46) for holding together the main body (38) and the clamp flange (45), a ring (52) which surrounds the main body (38) and the clamp flange (45) and which has a ball channel (53) in its cylindrical inner surface and at least three pairs of balls (40, 41).
  9. Device according to Claim 8, characterized in that the main body (38) has three radial bores (39) offset at 120° for the radial guiding of the three pairs of balls (40, 41) and, adjoining said radial bores (39), three sockets (50) extending in the peripheral direction of the main body (38), in the direction of release of the clamp nut (37), and suitable for receiving the outer balls (40) of the pairs of balls (40, 41); and in that the clamp flange (45) has a hub (57) which engages in an annular recess (42) adjoining the hub part (43), carrying the clamp flange (45), of the main body (38) and which is provided with sockets (48) having a surface (49) inclined relative to the clamping plane, for the reception of the inner balls (41) of the pairs of balls (40).
  10. Device according to Claim 9, characterized in that springs (51), which continuously push the outer balls (40) into their clamping position, are inserted into the sockets (50) extending in the peripheral direction in the main body (38).
  11. Device as claimed in one of Claims 1 to 3, characterized in that a clamp flange (55) fastened on a work spindle (54) has a multi-part configuration similar to the multi-part clamp nut (37) according to Claim 9 and consists of a main body (56), a clamp flange (61), a ring (66) which surrounds and holds together these two parts and has a ball channel (67) in its cylindrical inner surface, and which contains at least three pairs of balls (40, 41).
  12. Device according to Claim 11, characterized in that the main body (56) has three radial bores (58) offset at 120° for the radial guiding of the three pairs of balls (40, 41) and, adjoining said radial bores (58), three sockets (65) extending in the peripheral direction of the main body (56), directed in the release direction and appropriate for the reception of the outer balls (40) of the pairs of balls (40, 41); and in that the clamp flange (61) has a hub (60) which engages in an annular recess (59) in the main body (56) and is provided with sockets (70) having a surface (71), inclined relative to the clamping plane, for the reception of the inner balls (41) of the pairs of balls (40, 41)
  13. Device according to Claim 12, characterized in that springs (51) which continuously push the outer balls (40) into their locking position are inserted into the sockets (65) extending in the peripheral direction in the main body (56).
  14. Device according to Claim 12, characterized in that the main body is made in one piece with the work spindle.
  15. Device according to Claim 12, characterized in that the main body (56) is pressed onto a work spindle (54).
  16. Device according to one of Claims 1 to 3, characterized in that the work spindle (54) is mounted in a two-part clamp flange comprising a sleeve (62) forming the actual clamp flange and a support flange (61) pushed onto said sleeve (62); in that the sleeve (62) is in turn mounted in a ball bearing (64) and carries a drive wheel (63) for rotationally driving the tool; in that the support flange (61) has a plurality of sockets (70) having a surface (71) inclined relative to the clamping plane; in that the support flange (61) has associated with it an intermediate member (56) which is fastened axially immovably on the work spindle (54) and, corresponding to the sockets (70) in the support flange (61), has a plurality of radial bores (58) for guiding an equal number of pairs of balls (40, 41), of which the outer balls (40) can penetrate into sockets (65) arranged in the peripheral direction in the outer peripheral wall of the intermediate member (56) and extending in the release direction, and of which the inner balls (41) are associated with the sockets (70) provided with the inclined surfaces (71) in the support flange (61); and in that the intermediate member (56) and the support flange (61) are surrounded by a ring (66) which in its cylindrical inner surface has a ball channel (67) for guiding the outer balls (40) of the pairs of balls (40, 41).
  17. Device according to Claim 16, characterized in that the ring (66) is provided with notches (68) in which a locking member (69) capable of operation by hand can engage.
  18. Device for detachably fastening a disc-shaped tool on a work spindle (111), comprising two flanges (98, 117) which bear against the tool and of which one forms a clamp flange (92, 117) which, with the aid of an operating member (105, 122), can be relieved of the clamping pressure for the tool by the release of a support means (96) securing it against axial displacement on the work spindle (111), characterized in that the support means are rollers (96) in a roller cage (95), which are arranged as thrust bearings, between parts (93, 94, 97, 114, 117) of a clamp flange (92, 117) or a clamp nut (113), which parts are axially rotatable and displaceable relative to each other, while radially extending depressions (98) formed in the end face of at least one of the rotatable and displaceable parts (93, 94, 97, 114,117) and having an inclined inlet/outlet surface (99) serve as an escape space, the number of such depressions and their spacing being identical to those of the rollers (96).
  19. Device according to Claim 18, characterized in that the clamp flange (92) consists of a main body (93) having an annular end face in which radially extending depressions (98) having an inclined approach surface (99) are formed, and of a flange (94) having two planar end faces, a disc (97) having two planar end faces between the main body (93) and the flange (94), two roller thrust bearings (95/96) - one each between the flange (94) and the disc (97) and between the disc (97) and the main body (93) - and an outer ring (105) surrounding not only the main body (93) but also the flange (94) and the parts (95, 96, 97) disposed between them, said ring being joined firmly to the disc (97).
  20. Device according to Claim 19, characterized in that the main body (93) and the flange (94) engage axially one in the other by means of projections (101) and corresponding recesses (102) for said projections (101); in that in the cylindrical inner surface formed by the projections (101) and the zones between the recesses (102) an annular slot (103) is formed, and in that a narrower spring ring (104) is inserted into said slot and thus holds together the main body (93) and the flange (94) with axial clearance.
  21. Device according to Claim 19, characterized in that the main body (93) and the clamp flange (94) are provided with sealing rings (106) which seal the interior space containing the disc (97) and the roller thrust bearings (95/96).
  22. Device according to Claim 19, characterized in that the roller thrust bearing (95/96) which lies against the end face provided with the radially extending depressions (98) has associated with it a spring (108) which exerts a turning action on the roller thrust bearing and which has its abutment (110) on the main body (93) provided with the depressions (98); and in that the rotary movement of the roller thrust bearing (95/96) is limited in the direction of the action of said spring (108) by a stop (109) on the main body (93).
  23. Device according to Claim 18, characterized in that the clamp nut (113) consists of a main body (114), a clamp flange (117) having a smooth end face and an end face in which radially extending depressions (98) having an inclined approach surface (99) are formed, a disc (97), two roller thrust bearings (95/96) adjoining the disc (97), and a ring (122) surrounding a flange (120) of the main body (114), the disc (97) and the roller thrust bearings (95/96), said ring (122) being joined firmly to the disc (97).
  24. Device according to Claim 23, characterized in that the main body (114) has external key surfaces (116) and the clamp flange (117) has internal key surfaces (118) matching said external key surfaces (116), so that the main body (114) and the clamp flange (117) can be positively secured against rotation relative to one another, and in that a clamp ring (119) is pressed onto that end of the main body (114) which projects through the clamp flange (117), which clamp ring holds together all the parts (95/96, 97/114, 117, 122) of the clamp nut (113) in such a manner that the clamp flange (117) has on the main body (114) sufficient axial clearance for tight clamping.
  25. Device according to one of Claims 1 to 3, characterized in that one of the clamp flanges is of multi-part construction, comprising a support flange (73) provided with sockets (74) having support surfaces (75) and with a hub (76), a clamp flange (77) which by means of a securing ring (78) is held firmly on the hub (76) with axial clearance, three radial bores (79) offset at 120° relative to one another for the reception in each of them of a pair of balls (40, 41), said bores being open at the side in the one case, in their inner part, towards the sockets (74) provided with the support surfaces (75) and in the other case, in their outer part, in the opposite direction thereto, and further comprising a ring (80) surrounding the clamp flange (77) together with the pairs of balls (40, 41).
  26. Device according to Claim 25, characterized in that the clamp flange (77) and the ring (80) are held together with axial resiliency by screws (81), which are distributed over the outer, annular portion of the clamp flange (77), and by coil springs (85) inserted, under the heads of said screws (81), into depressions (84).
  27. Device according to Claim 25, characterized in that the ring (80) is stepped in its internal diameter, so that it was possible to form an inner cylindrical surface, which has axially extending channels (90), and an outer cylindrical surface (91), and in that the step (89) is associated with the outer balls (40) in such a manner that in the permitted axial movement of the ring (80) it is moved past the point where the balls (40) are supported on the ring (80).
  28. Device according to one of Claims 1 to 3, characterized in that the ball (11, 40) associated with the escape space is slightly offset away from the escape space in order to utilize the slight wedging action, which thus occurs when the clamping pressure is exerted, as security against unintentional release through shaking.
EP86117568A 1986-02-05 1986-12-17 Device for releasably mounting a disc-like working-tool Expired - Lifetime EP0231500B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863603384 DE3603384A1 (en) 1986-02-05 1986-02-05 DEVICE FOR DETACHABLE FASTENING OF A DISC-SHAPED TOOL
DE3603384 1986-02-05

Publications (3)

Publication Number Publication Date
EP0231500A2 EP0231500A2 (en) 1987-08-12
EP0231500A3 EP0231500A3 (en) 1988-06-08
EP0231500B1 true EP0231500B1 (en) 1994-04-13

Family

ID=6293332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117568A Expired - Lifetime EP0231500B1 (en) 1986-02-05 1986-12-17 Device for releasably mounting a disc-like working-tool

Country Status (4)

Country Link
US (1) US4850154A (en)
EP (1) EP0231500B1 (en)
JP (1) JP2562444B2 (en)
DE (2) DE3603384A1 (en)

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WO1988006075A1 (en) * 1987-02-21 1988-08-25 Robert Bosch Gmbh Clamping device for the axial clamping of a tool, particularly a mill
WO1990000463A1 (en) * 1988-07-15 1990-01-25 Robert Bosch Gmbh Device for axially clamping a tool, in particular a grinding wheel
WO1990006210A1 (en) * 1988-12-07 1990-06-14 Robert Bosch Gmbh Hand tool with a multipart, manually operated quick-change clamping device
EP0381809A2 (en) * 1989-02-09 1990-08-16 Licentia Patent-Verwaltungs-GmbH Quick clamping device for disc-like working-tools for electric tools
EP0459697A1 (en) * 1990-05-25 1991-12-04 Black & Decker Inc. Powered tool with improved locking flange
US5567100A (en) * 1993-03-15 1996-10-22 Power Tool Holders Incorporated Torque enhancing clamping nut
US5577872A (en) * 1993-03-15 1996-11-26 Power Tool Holders Incorporated Torque enhancing tightening screw
US5810533A (en) * 1993-06-30 1998-09-22 Power Tool Holders Incorporated Screw for fastening
US5871322A (en) * 1994-12-22 1999-02-16 Power Tool Holders Incorporated Clamp screw
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
DE10137445A1 (en) * 2001-07-31 2003-02-13 Ina Schaeffler Kg Clamping device for detachably fixing disc-like tool on spindle includes roller between operating element and tension nut rolling on facing rolling tracks holding roller even when operating element is released and tool is relaxed

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DE3741484C1 (en) * 1987-12-08 1989-08-24 Fein C & E Hand machine tool with automatic locking of the work spindle
DE3832624A1 (en) * 1988-09-26 1990-04-05 Licentia Gmbh Quick-clamping device for disc-shaped tools attached to the working shaft of an electric tool
DE3903765A1 (en) * 1989-02-09 1990-08-16 Licentia Gmbh Quick-clamping device for disc-shaped working tools of electric tools
JPH0387540U (en) * 1989-12-20 1991-09-05
US5332779A (en) * 1990-06-04 1994-07-26 Kawasaki Steel Corporation Polymerizable silica sol, adamantane derivative for use in the sol and cured resin prepared using the same
JPH081805Y2 (en) * 1991-03-20 1996-01-24 リョービ株式会社 Tool attachment / detachment device
JP3244718B2 (en) * 1991-05-22 2002-01-07 株式会社マキタ Device for fixing rotary cutting tools in rotary tools
GB9204345D0 (en) * 1992-02-28 1992-04-08 Black & Decker Inc Improvements in or relating to flange locks
JP2520828B2 (en) * 1992-09-28 1996-07-31 株式会社松浦機械製作所 Improved tool holder
DE4411730C1 (en) * 1994-04-05 1995-07-27 Siemens Ag Arrangement for centring and securing blades of circular saw
DE29518660U1 (en) * 1995-11-23 1996-02-01 Ant. Panhans GmbH Werkzeug- und Maschinenfabrik, 72488 Sigmaringen Jig
DE19649514A1 (en) * 1996-11-29 1998-06-04 Bosch Gmbh Robert Hand tool
US6273659B1 (en) 1997-02-17 2001-08-14 Power Tool Holders Incorporated Locking mechanism for a rotary working member
WO1998039141A1 (en) * 1997-03-07 1998-09-11 Yutaka Maeda Collet and fastener using same
DE19824387A1 (en) * 1998-05-30 1999-12-02 Fein C & E Power-driven hand tool
AT409469B (en) * 1998-11-10 2002-08-26 Swarovski Tyrolit Schleif TENSIONING DEVICE FOR GRINDING WHEELS
US6645058B2 (en) * 2000-11-30 2003-11-11 Black & Decker Inc. Clamp mechanism for rotary tool disc
ATE327863T1 (en) 2002-01-10 2006-06-15 Black & Decker Inc GEAR CASE
DE10308743B3 (en) * 2003-02-28 2004-11-11 Hilti Ag Quick release nut for disc-shaped tools
JP4519514B2 (en) * 2004-04-28 2010-08-04 株式会社マキタ Fixing nut
ATE389510T1 (en) 2005-11-28 2008-04-15 Metabowerke Gmbh TOOL WITH QUICK CLAMPING DEVICE
JP4953077B2 (en) * 2006-09-13 2012-06-13 新東工業株式会社 Long material support mechanism, long material support unit using the support mechanism, and a steady method for stabilizing the long material
US20090169336A1 (en) * 2007-12-27 2009-07-02 Ting-Kuang Chen Locking Device With Quick Release Mechanism
US8499431B2 (en) * 2009-10-26 2013-08-06 Robert Bosch Gmbh Piezoelectric clamping device
RU2536017C2 (en) * 2010-05-04 2014-12-20 Те Глисон Воркс Device to lock tool at spindle
CN109304662B (en) * 2018-10-16 2020-11-10 诺伯特智能装备（山东）有限公司 Quick polishing robot
BR112021007485A2 (en) 2018-10-19 2021-07-27 Saint-Gobain Abrasives, Inc. grinding disc assembly

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Cited By (17)

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Publication number Priority date Publication date Assignee Title
US4941790A (en) * 1987-02-21 1990-07-17 Robert Bosch Gmbh Clamp device for axially clamping a tool, particularly a disc
WO1988006075A1 (en) * 1987-02-21 1988-08-25 Robert Bosch Gmbh Clamping device for the axial clamping of a tool, particularly a mill
US5161334A (en) * 1988-07-12 1992-11-10 Robert Bosch Gmbh Hand power tool with a multi-part, manually operable quick-action chuck
WO1990000463A1 (en) * 1988-07-15 1990-01-25 Robert Bosch Gmbh Device for axially clamping a tool, in particular a grinding wheel
US5175963A (en) * 1988-07-15 1993-01-05 Robert Bosch Gmbh Clamping device for axially clamping of a tool, especially a disc
AU615999B2 (en) * 1988-07-15 1991-10-17 Robert Bosch Gmbh Device for axially clamping a tool, in particular a grinding wheel
WO1990006210A1 (en) * 1988-12-07 1990-06-14 Robert Bosch Gmbh Hand tool with a multipart, manually operated quick-change clamping device
EP0381809A2 (en) * 1989-02-09 1990-08-16 Licentia Patent-Verwaltungs-GmbH Quick clamping device for disc-like working-tools for electric tools
EP0381809A3 (en) * 1989-02-09 1990-10-17 Licentia Patent-Verwaltungs-GmbH Quick clamping device for disc-like working-tools for electric tools
EP0459697A1 (en) * 1990-05-25 1991-12-04 Black & Decker Inc. Powered tool with improved locking flange
US5567100A (en) * 1993-03-15 1996-10-22 Power Tool Holders Incorporated Torque enhancing clamping nut
US5577872A (en) * 1993-03-15 1996-11-26 Power Tool Holders Incorporated Torque enhancing tightening screw
US5810533A (en) * 1993-06-30 1998-09-22 Power Tool Holders Incorporated Screw for fastening
US5871322A (en) * 1994-12-22 1999-02-16 Power Tool Holders Incorporated Clamp screw
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
DE10137445A1 (en) * 2001-07-31 2003-02-13 Ina Schaeffler Kg Clamping device for detachably fixing disc-like tool on spindle includes roller between operating element and tension nut rolling on facing rolling tracks holding roller even when operating element is released and tool is relaxed

Also Published As

Publication number Publication date
EP0231500A2 (en) 1987-08-12
DE3603384A1 (en) 1987-08-06
DE3689790D1 (en) 1994-05-19
JP2562444B2 (en) 1996-12-11
JPS6322205A (en) 1988-01-29
US4850154A (en) 1989-07-25
EP0231500A3 (en) 1988-06-08

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