EP1274544B1 - Receptacle for grinder tools - Google Patents

Description

State of the art

The invention relates to a grinding machine tool holder according to the preamble of claim 1.

From the EP 0 904 896 A2 is a grinding machine tool holder for a hand-held angle grinder known. The angle grinder has a drive shaft which has a thread on the tool side.

The grinding machine tool holder has a driver and a clamping nut. To mount a grinding wheel, the driver is pushed with a mounting hole on a collar of the drive shaft and clamped over the clamping nut frictionally against a bearing surface of the drive shaft. The driver has a tool side in the axial direction extending collar radially on two opposite Has sides on its outer periphery recesses extending in the axial direction to a bottom of the Bunds extend. Starting from the recesses extending against the drive direction of the drive shaft in each case a groove on the outer circumference of the collar. The grooves are closed against the drive direction of the drive shaft and taper axially from the recesses against the drive direction of the drive shaft.

The grinding wheel has a hub with a mounting opening in which two opposite, radially inwardly pointing tongues are arranged. The tongues can be introduced into the recesses in the axial direction and then into the grooves in the circumferential direction, counter to the drive direction. The grinding wheel is positively connected via the tongues in the grooves in the axial direction and frictionally fixed by the tapered contour of the grooves. During operation, the frictional engagement increases due to acting on the grinding wheel reaction forces acting counter to the drive direction.

In order to prevent the grinding wheel from running off the driver when the drive shaft is being decelerated, a stopper is arranged in the region of a recess on the circumference of the collar and is movably mounted in an opening in the axial direction. In a working position pointing downwards with the grinding wheel, the stopper is deflected by gravity axially in the direction of the grinding wheel, closes the groove in the direction of the recess and blocks movement of the tongue located in the groove in the drive direction of the drive shaft.

Furthermore, from the US 2,425,368 A a grinder tool holder for a hand-held angle grinder known, which has a driving device, via which an insert tool with a drive shaft is operatively connected, wherein the insert tool via at least one movable against a spring force latching element with the driving device is operatively connected, which engages in an operating position of the insert tool and the insert tool fixed in a form-fitting, wherein the insert tool is connected in the circumferential direction via at least the locking element and in the axial direction via at least a second element with the driving device.

Furthermore, from the US 2,425,368 A a grinder insert tool an angle grinder is known, which is connectable to a tool hub via a driving device of a grinding machine tool holder with a drive shaft of a grinding machine, the tool hub via at least one movable against a spring force locking element with the driving device is operatively connected, which engages in an operating position of the tool hub and the Tool hub fixed in a form-fitting manner, wherein the insert tool is connected in the circumferential direction via at least the locking element and in the axial direction via at least one second element with the driving device.

Advantages of the invention

The invention relates to a grinding machine tool holder, in particular for a hand-held angle grinder, with a driving device, via which an insert tool with a drive shaft is operatively connected, wherein the insert tool via at least one movable against a spring force latching element with the driving device is operatively connected in a Operating position of the insert tool engages and fixed the insert tool positively, wherein the insert tool is connected in the circumferential direction via at least the locking element and in the axial direction via at least one further locking element with the driving device.

It is proposed that the further latching element fixes the insert tool in the axial direction in a form-fitting manner, wherein the further latching element is movably mounted against a spring element. By the positive locking a high level of security can be achieved and it can be a simple and inexpensive tool-free quick-release system can be created. Unintentional running of the insert tool can safely be avoided, even with braked drive shafts in which large braking torques can occur.

The locking element can positively fix the insert tool directly or indirectly via an additional component, for example via a latching element coupled, rotatably and / or axially displaceably mounted locking lever or plunger etc. It is also conceivable that the locking element, the insert tool in the radial direction and directly / or indirectly positively fixed. It is also possible that by the positive fixation of the insert tool with the locking element in a first direction, for example in the radial direction, the insert tool through
a separate component from the locking element is fixed in a form-fitting manner in a second direction, for example in the circumferential direction.

The movable latching element can be embodied in various forms that appear appropriate to the person skilled in the art, for example as an opening, projection, pin, bolt, etc., and can be arranged on the insertion tool or on the driving device.

Furthermore, an advantageous coding can be achieved by the positive engagement, so that only provided insert tools can be fixed in the grinding machine tool holder. The entrainment device can be at least partially designed as a detachable adapter part or can be non-releasably connected to the drive shaft in a force-fitting, positive-locking and / or cohesive manner.

The grinding machine tool holder can be used to attach various insertion tools that appear appropriate to a person skilled in the art, such as inserting tools for cutting, grinding, roughing, brushing, etc. A tool holder according to the invention can also serve to fasten a sanding disc of eccentric grinding machines.

The latching element is formed in a further embodiment of an elastically deformable component, whereby additional spring elements can be saved and simple, inexpensive constructions can be achieved.

The insert tool is connected in the circumferential direction via at least a first element and in the axial direction via at least one second element with the driving device. As a result, simple and inexpensive tool hubs can be achieved, which can be advantageously carried out flat. Hooking of the tool hubs during manufacture and storage can be avoided and good handling of the insert tool with its tool hubs can be made possible. Furthermore, the components can be advantageously designed for their function, i. either on the fixation in the circumferential direction or on the fixation in the axial direction. The elements may be formed by one component or, advantageously, by separate components. The tool hubs can easily be carried out advantageously with a closed center hole and it can be a low-vibration running of the insert tool allows. Furthermore, it can be achieved with a suitable choice of the diameter of the center hole, that provided for the grinding machine tool holder according to the invention tools can be attached via conventional fastening devices on conventional grinding machines, in particular on fastening devices, in which the insert tool with a clamping nut and a clamping flange on the drive shaft against a support surface in the axial direction is positively and circumferentially frictionally fixed.

The spring force can be designed to act in different directions, such as in the circumferential direction or particularly advantageous in the axial direction, whereby a structurally simple solution can be achieved. Furthermore, the spring force be used to fix the insert tool in the circumferential direction and also in the axial direction.

In a further embodiment of the invention it is proposed that a drive torque via a positive connection between the insert tool and the driving device is transferable. It can be safely transmitted a large drive torque and also it is avoidable that a drive torque affects a positive connection.

Advantageously, the insertion tool via at least one of the insert tool and / or arranged on the driving device, extending in the axial direction driving element with the driving device connectable through at least a portion of a slot of the corresponding mating component feasible, slidably along the slot and in an end position can be fixed by the locking element. With the driving element extending in the axial direction, a securing in the circumferential direction and in the axial direction can be achieved, wherein advantageously the insert tool is fixed positively in the axial direction via a transfer surface of the carrier element. It can be achieved high security and additional components, weight, installation costs and costs can be saved.

Advantageously, at least one spring element generating latching element is integral with a tool hub of the insert tool. The tool hub is usually made of a relatively thin material, which can be easily designed elastically deformable. However, it is also conceivable that at least one spring element with a component of the driving device is made in one piece or formed by an additional component, whereby the tool hub can be performed independently of a spring function.

In order to enable a long spring travel of the tool hub, at least one recess is advantageously introduced into a component forming a support surface for the insertion tool, into which part of the tool hub is elastically pressed in an operating position of the insertion tool.

In a further embodiment of the invention, it is proposed that the slot is introduced into the tool hub of the insert tool and in the region of the slot at least one latching element is formed by a part of the tool hub, and that particularly advantageously has the slot a wide range and an end position of the driving element at least one narrow, the locking element forming area. It can be simple, inexpensive and in particular substantially flat tool hubs are achieved, which can be handled in a space-saving and easy to manufacture and in a later storage, without the tool hubs hooked to each other or other objects. In addition to a narrowed area would be basic However, also an axial, the locking element forming increase in the tool hub conceivable.

It is also proposed that at least one locking element is movably mounted against a spring element. By the movably mounted locking element, a large deflection of the locking element can be made possible during assembly of the insert tool, whereby on the one hand a large overlap between two corresponding locking elements and a particularly secure form-locking can be realized and on the other a good audible Einrastgeräusch can be achieved, the one operator a desired performed locking action advantageously signaled.

The locking element may be designed to be movable in different directions against a spring element, such as in the circumferential direction or particularly advantageous in the axial direction, whereby a structurally simple solution can be achieved.

The latching element can be movably mounted even in a component in a bearing, for example in a flange of the driving device or in a tool hub of the insert tool. However, the latching element can also be positively connected to a movably mounted in a bearing member non-positively, positively and / or cohesively firmly or integrally formed with this, for example, with a mounted on the drive shaft component or with a tool hub of the insert tool.

If the latching element can be released from its detent position by means of an unlocking button and can be moved in particular against the spring element, an independent release of the latching connection, for example by a braking torque, can be safely avoided and safety can be increased. An operation of the insert tool in two circumferential directions can in principle be made possible and the comfort during assembly and disassembly of the insert tool can be increased.

Furthermore, it is advantageous at least one latching element extending in the axial direction in an operating position of the insert tool in the axial direction in a locking element corresponding recess of a tool hub of the insert tool can be latched and the insert tool in the circumferential direction positively fixed. With a structurally simple solution, an advantageous positive engagement in a circumferential direction and preferably in both circumferential directions can be achieved. The latching element extending in the axial direction may be formed by a separate bolt or by a molded pin, which is produced, for example, by a deep drawing process, etc.

If at least one locking element on a disc-shaped component and / or at least two elements for fixing the insert tool in the axial direction integrally formed on a disc-shaped component, additional components, assembly costs and costs can be saved. Furthermore, press connections between individual components and consequent weaknesses can be avoided.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, embodiments of the Invention shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

einen Winkelschleifer von oben,

Fig. 2

einen nicht erfindungsgemäßen Mitnahmeflansch von unten,

Fig. 3

der Mitnahmeflansch aus Fig. 2 in einer Seitenansicht,

Fig. 4

eine Werkzeugnabe einer nicht erfindungsgemäßen Trennscheibe von unten,

Fig. 5

einen Schnitt entlang der Linie V-V in Fig. 4 vergrößert dargestellt,

Fig. 6

eine Variante nach Fig. 3,

Fig. 7

eine Variante nach Fig. 4,

Fig. 8

einen Schnitt entlang der Linie VIII-VIII in Fig. 1 durch eine nicht erfindungsgemäße Mitnahmevorrichtung,

Fig. 9

eine Werkzeugnabe von unten,

Fig. 10

einen Schnitt entlang der Linie VIII-VIII in Fig. 1 durch eine erfindungsgemäße Mitnahmevorrichtung,

Fig. 11

eine Explosionszeichnung einer nicht erfindungsgemäßen Mitnahmevorrichtung,

Fig. 12

eine Werkzeugnabe aus Fig. 11 von oben,

Fig. 13

einen Schnitt entlang der Linie XIII-XIII in Fig. 12,

Fig. 14

eine Entriegelungstaste aus Fig. 11 von unten,

Fig. 15

einen Schnitt entlang der Linie XV-XV in Fig. 14,

Fig. 16

ein Mitnahmeelement aus Fig. 11 von unten,

Fig. 17

das Mitnahmeelement aus Fig. 16 von der Seite,

Fig. 18

einen Schnitt entlang der Linie XVIII-XVIII in Fig. 16,

Fig. 19

eine Explosionszeichnung einer nicht erfindungsgemäßen Mitnahmevorrichtung,

Fig. 20

einen Schnitt durch eine Mitnehmerscheibe aus Fig. 19 mit angeformten Bolzen,

Fig. 21

eine Seitenansicht einer Blechplatte aus Fig. 19 und

Fig. 22

ein Mitnahmeflansch aus Fig. 19 von unten.

Show it:

Fig. 1

an angle grinder from above,

Fig. 2

a non-inventive driving flange from below,

Fig. 3

the driving flange off Fig. 2 in a side view,

Fig. 4

a tool hub of a cutting disc not according to the invention from below,

Fig. 5

a section along the line VV in Fig. 4 shown enlarged

Fig. 6

a variant after Fig. 3 .

Fig. 7

a variant after Fig. 4 .

Fig. 8

a section along the line VIII-VIII in Fig. 1 by a driving device not according to the invention,

Fig. 9

a tool hub from below,

Fig. 10

a section along the line VIII-VIII in Fig. 1 by a driving device according to the invention,

Fig. 11

an exploded view of a driving device not according to the invention,

Fig. 12

a tool hub Fig. 11 from above,

Fig. 13

a section along the line XIII-XIII in Fig. 12 .

Fig. 14

a release button off Fig. 11 from underneath,

Fig. 15

a section along the line XV-XV in Fig. 14 .

Fig. 16

a driving element Fig. 11 from underneath,

Fig. 17

the entrainment element Fig. 16 of the page,

Fig. 18

a section along the line XVIII-XVIII in Fig. 16 .

Fig. 19

an exploded view of a driving device not according to the invention,

Fig. 20

a section through a drive plate Fig. 19 with molded bolts,

Fig. 21

a side view of a metal plate Fig. 19 and

Fig. 22

a driving flange off Fig. 19 from underneath.

Fig. 1 shows an angle grinder 10 from above with a mounted in a housing 96, not shown electric motor. The angle grinder 10 is over a first, in the housing 96 on the side facing away from a non-inventive cutting wheel 186 side, extending in the longitudinal direction of the handle 98 and a second attached to a gear housing 100 in the region of the cutting disc 186, extending transversely to the longitudinal direction handle 102nd feasible.

With the electric motor, a drive shaft 54 can be driven via a gear, not shown in more detail, at whose end facing the cutting disc 186 a non-inventive driving device 182 is arranged ( FIGS. 2 and 3 ).

The driving device 182 has a driving flange 256. The driving flange 256 is a thread 258 on the Driven drive shaft 54 and runs with a facing away from the blade 186 in the direction 44 facing end face 260 on a collar 262 on the drive shaft 54 at. It would also be possible to permanently connect a driving flange to a drive shaft or to make it integral with a drive shaft. In the driving flange 256 three driving pins 202, 204, 206 are pressed, which extend in the axial direction 38 via an axial bearing surface 264 of the driving flange 256 for the cutting disc 186 and which are evenly distributed in the circumferential direction. On the driving pins 202, 204, 206 heads are formed at their ends facing the blade 186 ends. The head has a larger diameter than the remaining part of the driving pin 202, 204, 206 and forms in the direction driving flange 256 a contact surface 278. On the support surface 264 in the axial direction 38 to the cutting disc 186 extending centering collar 266 is formed for the cutting disc 186.

The cutting disc 186 has a sheet metal hub 228 ( Fig. 4 ). The sheet metal hub 228 has a centering bore 268, via which the cutting disk 186 can be centered on the centering collar 266 of the driving flange 256. The sheet metal hub 228 is connected to an abrasive 114 via a not shown rivet and pressed. The sheet metal hub 228 has three elongated holes 214, 216, 218 distributed uniformly in the circumferential direction 34, 36, each having a wide area 244, 246, 248 produced by a bore and a narrow area 270, 272, 274 extending in the circumferential direction 36 ,

At a width of the wide area 244, 246, 248 opposite end of the slot 214, 216, 218, a portion of the sheet metal hub 228 is formed as a spring tab, which forms a latching element 190, 192, 194. Instead of spring tabs molded onto the sheet metal hub 228, spring-loaded driving bolts could also be attached to the driving flange.

If the cutting disc 186 is placed with its sheet metal hub 228 on the driving flange 256, the heads of the driving pins 202, 204, 206 through the wide portions 244, 246, 248 of the slots 214, 216, 218 inserted therethrough. The sheet metal hub 228 is aligned with its center hole 268 via the centering collar 266. By rotating the sheet metal hub 228 relative to the driving flange 256 against the drive direction 34, the spring tabs or the locking elements 190, 192, 194 push under the heads of the driving bolts 202, 204, 206. The direction of rotation 36 for attachment of the cutting disc 186 is the drive direction 34 of Drive shaft 54 opposite. This ensures that the cutting disc 186 does not accidentally come off when working. The heads of the driving pins 202, 204, 206 slide during rotation over lugs 276 of the spring tabs or the locking elements 190, 192, 194 and deflect them in the axial direction 44 to the driving flange 256 from. When the heads have passed the lugs 276 or an operating position of the cutting disc 186 is reached, the spring tabs jump back in the axial direction 38 partially and engage behind the heads form-fitting manner. A latching sound arising thereby can serve as a feedback to a user that the sheet metal hub 228 is fixed as desired. By a remaining tension or spring force of the spring tabs is the blade 186 in the axial direction 44 backlash pressed against the support surface 264.

The drive torque of the electric motor is transmitted from the driving flange 256 in a form-fitting manner via the driving bolts 202, 204, 206 and via the spring straps or via the locking elements 190, 192, 194 to the sheet metal hub 228. An occurring, the drive torque opposite braking torque is positively transmitted from the heads of the driving pins 202, 204, 206 via the lugs 276 of the locking elements 190, 192, 194 on the sheet metal hub 228 and frictionally engaged by the support surface 264 on a corresponding bearing surface of the sheet metal hub 228. The size of the friction force depends on the surface condition of the two bearing surfaces 264 and a clamping force of the spring tabs and can be adjusted accordingly via these parameters. Drainage of the cutting disc 186 is safely avoided. In order to transmit particularly large braking moments, for example, between the bearing surfaces a Velcro connection or other positive connection can be made.

In order to remove the cutting disc 186, rotating the cutting disc 186 relative to the driving flange 256 in the drive direction 34, so that the heads of the driving pins 202, 204, 206 slide over the lugs 276 of the locking elements 190, 192, 194. If the driving bolts 202, 204, 206 lie in the wide regions 244, 246, 248 of the elongated holes 214, 216, 218, the separating disk 186 can be pulled off the driving flange 256 in the axial direction 38.

In 6 and 7 an alternative driving device 184 not according to the invention is shown with a corresponding cutting disc 188. Essentially identical components are numbered in the illustrated embodiments in principle with the same reference numerals. Furthermore, in the embodiment in 6 and 7 with regard to the same features and functions on the description of the embodiment in Fig. 1 to 5 to get expelled.

The entrainment device 184 has a driving flange 234. In the driving flange 234 three driving pin 208, 210, 212 are pressed, which extend in the axial direction 38 via an axial bearing surface 232 of the driving flange 234 for the cutting disc 188 and in the circumferential direction 34, 36 are evenly distributed , At the driving pin 208, 210, 212 heads are formed at their ends facing the blade 188 ends. The head has a larger diameter than the remaining part of the driving pin 208, 210, 212 and forms in the axial direction 44 to the driving flange 234 a tapered, tapered transfer surface 226. In the region of the driving pins 208, 210, 212 are in the bearing surface 232 recesses 236th brought in.

The cutting disc 188 has a sheet metal hub 230 (FIG. Fig. 7 ). The sheet metal hub 230 has a centering bore 268, via which the cutting disk 188 can be centered on a centering collar 266 of the driving flange 234. The sheet metal hub 230 is connected to an abrasive 114 via a non-illustrated rivet and pressed. The sheet metal hub 230 includes three in the circumferential direction 34, 36 evenly spaced slots 220, 222, 224, each having a wide, through a hole produced area 238, 240, 242 and before an end position 250, 252, 254 of the driving pins 208, 210, 212 have a narrow, each a detent element 196, 198, 200 forming area.

If the cutting disc 188 is placed with its sheet metal hub 230 on the driving flange 234, the heads of the driving pins 208, 210, 212 are inserted through the wide areas 238, 240, 242 of the elongated holes 220, 222, 224. The sheet metal hub 230 is aligned with its center hole 268 via the centering collar 266. By rotating the sheet metal hub 230 relative to the driving flange 234 against the drive direction 34, the driving pins 208, 210, 212 slide into the arcuate slots 220, 222, 224. The direction of rotation 36 for attachment of the cutting disk 188 is opposite to the drive direction 34 of the drive shaft 54. This ensures that the cutting disc 188 does not accidentally come off while working.

The heads of the driving bolts 208, 210, 212 slide with their conical transfer surfaces 226 during rotation of the sheet metal hub 230 over the narrowed regions or via the latching elements 196, 198, 200 of the elongated holes 220, 222, 224 and in each case press a part of the sheet metal hub 230 in the region of the elongated holes 220, 222, 224 axially in the direction 44 of the driving flange 234 in the designated recesses 236 of the support surface 232 of the driving flange 234. If the cutting disc 188 has an operating position or have the driving pin 208, 210, 212 their end position 250, 252nd , 254 achieved with a comparison with the central region of the slots 220, 222, 224 slightly larger width, snap the locking elements 196, 198, 200 behind the heads of the driving pins 208, 210, 212 a positive fit. In the end positions 250, 252, 254, the sheet metal hub 230 is elastically deflected by the conical transfer surfaces 226 of the driving pins 208, 210, 212 by a defined amount. A remaining elastic clamping force of the sheet metal hub 230 presses them against the bearing surface 232. The sheet metal hub 230 is secured in a form-fitting manner in the axial direction 38, 44 without play.

The drive torque of the electric motor is transmitted by the driving flange 234 in a form-fitting manner via the driving bolts 208, 210, 212 at the end of the elongated holes 220, 222, 224 onto the sheet metal hub 230. An occurring, the drive torque opposite braking torque is positively transmitted from the heads of the driving pins 208, 210, 212 via the locking elements 196, 198, 200 on the sheet metal hub 230 and frictionally engaged by the support surface 232 on a corresponding bearing surface of the sheet metal hub 230. The size of the friction force depends on the surface condition of the two bearing surfaces 232 and a clamping force of the locking elements 196, 198, 200 and can be adjusted accordingly via these parameters. Drainage of the cutting disc 188 is safely avoided.

In order to remove the cutting disc 188, the cutting disc 188 is rotated relative to the driving flange 234 in the drive direction 34, so that the heads of the driving pins 208, 210, 212 slide over the locking elements 196, 198, 200. If the driving bolts 208, 210, 212 lie in the wide regions 238, 240, 242 of the elongated holes 220, 222, 224, the cutting disk 188 can be pulled off the driving flange 234 in the axial direction 38.

Fig. 8 shows a section along the line VIII-VIII in Fig. 1 through one too Fig. 2 Alternative, non-inventive driving device 12. The driving device 12 has on a cutting disc 18 according to the invention facing side on a drive shaft 54 firmly pressed driving flange 82 and on a side facing away from the cutting disc 18 on the drive shaft 54 axially against a centrally disposed helical spring 20 slidably mounted Drive plate 56.

In driving flange 82, three pins 40 are pressed, which extend in the axial direction 38 to the cutting disk 18 via the driving flange 82 and are distributed uniformly in the circumferential direction 34, 36. The pins 40 have at their end facing the cutting disc 18 each having a head which has a larger diameter relative to a remaining part of the pin 40 and on a driving flange 82 side facing a conical, in the axial direction 44 tapered contact surface 76 has. The driving flange 82 forms an axial bearing surface 80 for the cutting disk 18, which defines an axial position of the cutting disk 18 and in which recesses 84 are made in the area of the pins 40. Further, three axial through holes 104 are inserted into the driving flange 82, which are uniformly distributed in the circumferential direction 34, 36, namely, in each case a through hole 104 in the circumferential direction 34, 36 between two pins 40 is arranged.

In the axially slidably mounted on the drive shaft 54 drive plate 56 three bolts 24 are pressed, which in the axial direction 38 to the cutting wheel 18 via the drive plate 56 extend and circumferentially 34, 36 are evenly distributed. The drive plate 56 is pressed by the coil spring 20 in the direction 38 to the cutting wheel 18 against the driving flange 82. The bolts 24 protrude through the through holes 104 and extend in the axial direction 38 via the driving flange 82.

The unlocking button 28 has three evenly distributed in the circumferential direction 34, 36, in the axial direction 44 to the axially movable drive plate 56 extending segments 106, which by corresponding Recesses 108 of the driving flange 82 engage and are connected via a snap ring 110 with the drive plate 56 in the axial direction 38 and secure the release button 28 against falling out. The unlocking button 28 is slidably guided in an annular recess 112 in the driving flange 82 in the axial direction 38, 44.

The cutting disc 18 has a sheet metal hub 52 which is fixedly connected to an abrasive agent 114 via a non-illustrated rivet and pressed ( Fig. 9 ). The tool hub could also be made of another, the skilled person appear appropriate material, such as plastic, etc. The sheet hub 52 has in the circumferential direction 34, 36 successively three holes 46, 48, 50, whose diameter is slightly larger than the diameter of Bolt 24. Further, the sheet metal hub 52 has three circumferentially 34, 36 arranged one behind the other, in the circumferential direction 34, 36 extending slots 64, 66, 68, each having a narrow portion 70, 72, 74 and a wide, made by a bore portion 58, 60, 62, whose diameter is slightly larger than the diameter of the heads of the pins 40th

The sheet metal hub 52 has a centering bore 116 whose diameter is advantageously chosen so that the cutting disk 18 can be clamped on a conventional angle grinder with a conventional clamping system with a clamping flange and a spindle nut. It ensures a so-called backward compatibility.

When mounting the cutting disc 18, the cutting disc 18 is pushed with its center hole 116 on the release button 28 and radially centered. Subsequently, the cutting disc 18 is rotated, until the pins 40 in the designated wide areas 58, 60, 62 of the slots 64, 66, 68 of the sheet metal hub 52 engage. Pressing the sheet metal hub 52 against the bearing surface 80 of the driving flange 82 causes the bolts 24 in the through holes 104 and the driving disc 56 to be displaced axially against the spring force of the helical spring 20 on the drive shaft 54 in the direction away from the cutting disk 18.

Further rotation of the sheet metal hub 52 against the drive direction 34 causes the pins 40 in the arcuate narrow portions 70, 72, 74 of the slots 64, 66, 68 are moved. The pins 40 press with their conical contact surfaces 76 on the edges of the slots 64, 66, 68 and press them elastically into the recesses 84 of the driving flange 82. The sheet metal hub 52 is characterized in the Support surface 80 pressed and fixed in the axial direction 38, 44.

In a reached operating position of the cutting disc 18, the bores 46, 48, 50 come in the sheet metal hub 52 via the through holes 104 of the driving flange 82 to lie. The bolts 24 are axially displaced by the spring force of the coil spring 20 in the direction 38 of the cutting disc 18, engage in the bores 46, 48, 50 of the sheet metal hub 52 and fix them in both circumferential directions 34, 36 form fit. When snapping into place, an audible click sound is heard by an operator, signaling that the device is ready for operation.

A drive torque of the electric motor of the angle grinding machine 10 can be transmitted from the drive shaft 54 to the driving flange 82 in a force-locking manner and from the driving flange 82 in a form-fitting manner via the bolts 24 to the cutting disk 18. The drive torque is transmitted exclusively via the pin 24, since the slots 64, 66, 68 are designed so that the pins 40 do not come at latched pin 24 at the narrow end 70, 72, 74 of the slots to rest. Furthermore, a braking torque which is opposite to the drive torque during and after the switching-off of the electric motor can be transmitted in a form-fitting manner from the driving flange 82 via the bolts 24 to the cutting disk 18. An unwanted release of the blade 18 is safely avoided. By circumferentially 34, 36 evenly distributed three bolts 24 an advantageous uniform forces and mass distribution is achieved.

To release the blade 18 of the angle grinder 10, the release button 28 is pressed. The driver disc 56 is thereby displaced with the bolt 24 via the unlocking button 28 against the coil spring 20 in the axial direction 44 facing away from the blade 18, whereby the bolt 24 in the axial direction 44 from its detent position or from the holes 46, 48, 50 of the sheet metal hub 52 move. Subsequently, the cutting disc 18 is rotated in the drive direction 34, until the pins 40 in the wide areas 58, 60, 62 of the slots 64, 66, 68 come to rest and the blade 18 can be removed in the axial direction 38 of the driving flange 82. After releasing the release button 28, the drive plate 56, the pin 24 and the release button 28 are moved by the coil spring 20 back to their original positions.

In Fig. 10 is the embodiment in Fig. 8 an alternative embodiment shown with a driving device 14 according to the invention. With regard to the same features and functions can be to the description of the embodiment in 8 and 9 to get expelled.

The entrainment device 14 has a driving flange 54 pressed onto the driving flange 90. At the bearing surface 88 for the cutting disc 18 forming driving flange 90, a collar 92 is formed over which the cutting disc 18 is radially centered in mounted with its center hole 116 state. Radial forces can advantageously be absorbed by the driving flange 90 without loading the unlocking button 28.

Further, in the driving flange 90 three in the circumferential direction 34, 36 successively uniformly distributed, extending in the axial direction 38 on the support surface 88 pins 42 for axial fixing of the cutting disc 18 in the axial direction 38 against each plate spring 86 slidably mounted. The pins 42 have at their end facing the blade 18 each having a head which has a larger diameter than a remaining part of the pin 42 and on a driving flange 90 side facing a conical, tapered in the axial direction 44 transfer surface 78 and a parallel to Support surface 88 extending contact surface 78a has. Are the heads of the pins 42 through the wide portions 58, 60, 62 of the slots 64, 66, 68, causes rotation of the sheet metal hub 52 against the drive direction 34 that the pins 42 in the arcuate narrow portions 70, 72, 74 of the Slotted holes 64, 66, 68 are moved. The pins 42 are axially displaced via the conical transfer surfaces 78 against the pressure of the disc springs 86 in the direction 38 until the abutment surfaces 78a of the pins 42, the edges of the slots 64, 66, 68 in the arcuate narrow portions 70, 72, 74 overlap.

In the assembled state, the plate springs 86 press the separating disk 18 against the support surface 88 via the abutment surfaces 78a of the pins 42. Instead of having a plurality of disk springs 86, the pins can also be loaded by a common spring element, for example not extending closer over the entire circumference shown plate spring. This in Fig. 10 illustrated embodiment with the axially displaceably mounted pins 42 is particularly suitable for thick and / or little elastically deformable tool hubs.

In 11 to 18 is a further embodiment shown with a non-inventive driving device 16. The entrainment device 16 has a driving flange 118 (not shown in greater detail) attached via a thread 120 (FIG. Fig. 11 . FIGS. 16, 17 and 18 ). The driving flange could also be connected via a non-detachable connection to the drive shaft or be made in one piece with this.

The driving flange 118 has three circumferentially 34, 36 arranged one behind the other, extending in the axial direction 38 to a non-inventive cutting disk 32 extending segments 122, 124, 126 and intervening spaces 128, 130, 132 on ( Fig. 16 ). Each of these segments 122, 124, 126 has on its circumference a groove 134, 136, 138, which are opposite to the drive direction 34 in each case via a rotation stop 140, 142, 144 closed and open in the drive direction 34. The driving flange 118 also has a bearing surface 180, which defines an axial position of the cutting disk 32. Further, the segments 122, 124, 126 form a centering collar for the cutting disk 32, over which the cutting disk 32 can be centered.

With the driving flange 118, a locking element 26 is connected in the assembled state via three locking pins 146, 148, 150 distributed over the circumference, which engage through corresponding recesses 158, 160, 162 of the driving flange 118 and engage radially behind the driving flange 118 (FIG. Fig. 11 . 14 and 15 ). On the locking element 26, which also forms an unlocking button 30, three in the circumferential direction 34, 36 in a row arranged, radially outwardly extending locking segments 152, 154, 156 integrally formed. Between the driving flange 118 and the latching element 26, a helical compression spring 22 is arranged, against which the latching element 26 is displaceable relative to the driving flange 118 in the axial direction 44 facing away from the cutting disk 32. The latching element 26 is thereby guided via radially outwardly facing bearing surfaces 164, 166, 168 between the locking segments 152, 154, 156 in radially inwardly facing surfaces of the segments 122, 124, 126 of the driving flange 118. In order to avoid tilting of the latching element 26 and to achieve small bearing surfaces 164, 166, 168, the bearing surfaces 164, 166, 168 are formed by radially outwardly extending projections 170 (FIG. Fig. 14 ).

The locking segments 152, 154, 156 are in the assembled state in the intermediate spaces 128, 130, 132 of the driving flange 118 and project radially over a groove bottom of the grooves 134, 136, 138. In a starting position before mounting the cutting disk 32 are the blocking segments 152nd , 154, 156 of the locking element 26 in front of the grooves 134, 136, 138, and that loaded by the prestressed helical compression spring 22nd

The cutting disc 32 has an annular sheet metal hub 94, which is pressed at its outer diameter with an abrasive 114 and at its inner diameter radially inwardly facing tongues or spring elements 172, 174, 176 ( Fig. 11 . 12 and 13 ). The spring elements 172, 174, 176 are used in conjunction with the driving flange 118 and the release button 30 for transmitting the drive torque, for axially positioning the cutting disk 32 and for securing against running off of the cutting disk 32 when switching off the electric motor or when braking the drive shaft. Further, the spring elements could be used in addition to the segments 122, 124, 126 for centering the cutting disk 32 to the drive shaft.

When mounting the cutting disk 32, this is aligned on the driving flange 118, so that the spring elements 172, 174, 176 at the inner diameter of the sheet metal hub 94 in the intermediate spaces 128, 130, 132 between the segments 122, 124, 126 on the driving flange 118 have. The spring elements 172, 174, 176 of the cutting disk 32 rest on the locking segments 152, 154, 156 of the unlocking key 30. Subsequently, the cutting disk 32 is pressed in the axial direction 44 as far as the contact surface 180 of the driving flange 118. The spring elements 172, 174, 176 move the unlocking button 30 with its locking segments 152, 154, 156 against the spring force of the helical compression spring 22 in the direction away from the cutting disc 32 direction 44. The locking segments 152, 154, 156 are in recesses 178 of the driving flange 118th pressed ( Fig. 18 ), so that the spring elements 172, 174, 176 come to rest in front of the grooves 134, 136, 138.

The cutting disk 32 is radially centered over the centering collar formed by the segments 122, 124, 126. By rotating the cutting disk 32 against the drive direction 34, the spring elements 172, 174, 176 engage in the grooves 134, 136, 138 of the driving flange 118. The result is a tongue and groove connection. The spring elements 172, 174, 176 have in the circumferential direction 36, the length of the grooves 134, 136, 138. Are the spring elements 172, 174, 176 completely in the grooves 134, 136, 138 is inserted or an operating position of the cutting disk 32 is reached, the locking element 26 engages with its locking segments 152, 154, 156, wherein the helical compression spring 22 pushes the locking element 26 with its locking segments 152, 154, 156 in its initial position, so that the locking segments 152, 154, 156 again come to rest in front of the grooves 134, 136, 138. The locking element 26 is fixed with its locking segments 152, 154, 156, the cutting disk 32 against the drive direction 34 positively.

The latching creates an audible click sound for an operator, which signals to the operator a desired snap action and a readiness for operation.

The transmission of the drive torque takes place in a form-fitting manner via the rotational stops 140, 142, 144 of the driving flange 118 on the spring elements 172, 174, 176 of the sheet metal hub 94 or the cutting disk 32. The cutting disk 32 is above that of the segments 122, 124, 126 of the driving flange Centering 118 centered and held by the support surface 180 and the grooves 134, 136, 138 in its axial position. Further, an occurring during and after switching off the electric motor, the drive torque opposing braking torque is positively transmitted from the locking segments 152, 154, 156 and the driving flange 118 on the spring elements 172, 174, 176 of the cutting disk 32.

A clearance compensation is achieved in the axial direction by an unspecified, by a formed of a sheet metal strip spring element in the grooves 134, 136, 138. Further a clearance compensation could be achieved via other spring element that appears to be suitable for the person skilled in the art, for example via spring-loaded balls, which are arranged at suitable locations of the driving flange and fix the tool hub of the cutting disc without clearance, and / or via a small excess of the spring elements of the tool hub a slightly wedge-shaped shape of the grooves and the spring elements of the tool hub, etc.

To release the cutting disk 32, the unlocking key 30 is pressed in the axial direction 44 facing away from the cutting disk 32. The blocking segments 152, 154, 156 of the unlocking button 30 and of the latching element 26 are displaced into the recesses 178 of the driving flange 118. Subsequently, the cutting disk 32 can be rotated in the drive direction 34 with its spring elements 172, 174, 176 from the grooves 134, 136, 138 of the driving flange 118 and withdrawn in the axial direction 38. When removing the cutting disk 32, the unlocking button 30 is pushed back by the helical compression spring 22 in its initial position.

In Fig. 19 is the embodiment in Fig. 10 an alternative embodiment with a non-inventive driving device 300 shown. The entrainment device 300 has a driving flange 90, which forms a bearing surface 88 for a non-inventive cutting disc not shown. On the driving flange 90, a collar 92 is integrally formed on the side facing the cutting disk, via which the cutting disc is radially centered with its center hole in the mounted state. Radial forces can advantageously from the driving flange 90th
be recorded without burdening a release button 28.

On a side facing away from the cutting disc of the driving flange 90 is a metal plate 308 with three circumferentially evenly distributed, integrally formed, extending in the axial direction 38 fasteners 306 arranged for axially fixing the cutting disc. The fastening elements 306 are formed in a bending process on the metal plate 308.

When mounting the driving flange 90, a corrugated spring 312 and the metal plate 308 are pre-assembled. In this case, the corrugated spring 312 is pushed onto a collar 322 of the driving flange 90 pointing in the direction away from the cutting wheel. Subsequently, the fastening elements 306 of the sheet-metal plate 308, which at its free end have a hook-shaped extension with an obliquely facing surface 310 ( Fig. 19 and 21 ), guided in the axial direction 38 through recesses 314 of the driving flange 90, in each case by widened regions 316 of the recesses 314 (FIG. Fig. 19 and 21 ). By compressing and rotating the metal plate 308 and the driving flange 90 against each other, the corrugated spring 312 is biased, and the metal plate 308 and the driving flange 90 are positively connected in the axial direction 38, 44, in that the hook-shaped projections in narrow portions 318 of the recesses 314 is rotated become ( Fig. 19 . 21 and 22 ). The metal plate 308 is then, loaded by the corrugated spring 312, supported on the bearing surface 88 of the driving flange 90 via edges 310a of the hook-shaped extensions, which point axially in the direction away from the cutting wheel direction.

After the sheet metal plate 308 with the molded fastening elements 306, the wave spring 312 and the driving flange 90 are pre-assembled, a compression spring 20 and a driving plate 304 with three evenly distributed over the circumference, extending in the axial direction 38, integrally formed pin 302 on a drive shaft 54 plugged. The bolts 302 are formed in a deep-drawing process to a plate 304 forming the plate plate ( Fig. 20 ).

Subsequently, the preassembled module, consisting of the metal plate 308, the wave spring 312 and the driving flange 90, is mounted on the drive shaft 54. The bolts 302 are guided during assembly by integrally formed on the periphery of the metal plate 308 recesses 320 and through holes 104 in the driving flange 90 and engage in the assembled state through the through holes 104 therethrough. The metal plate 308 and the driving flange 90 are secured against rotation relative to one another via the bolts 302.

The driving flange 90 is pressed onto the drive shaft 54 and then secured with a locking ring, not shown. In addition to a press connection, however, other, the expert appear useful as connections conceivable, such as a threaded connection, etc.

Are in the assembly of a cutting wheel 18 (see. Fig. 8 and 10 ) the hook-shaped extensions of the fastening elements 306 through the wide regions 58, 60, 62 of the elongated holes 64, 66, 68 of the sheet metal hub 52 out ( Fig. 19 ), causes the rotation of the sheet metal hub 52 against the drive direction 34 that the hook-shaped projections in the arcuate, narrow portions 70, 72, 74 of the slots 64, 66, 68 of the sheet metal hub 52 are moved. In this case, the metal plate 308 is moved with the fastening elements 306 via the inclined surfaces 310 axially against the pressure of the wave spring 312 in the direction 38 until the edges 310a of the hook-shaped projections in arcuate, narrow areas 70, 72, 74 laterally adjacent to the slots 64, 66, 68 of the sheet metal hub 53 come to rest. In the assembled state, the corrugated spring 312 presses the cutting disk 18 against the bearing surface 88 via the edges 310a of the hook-shaped extensions.

• ROBERT BOSCH GMBH; D-70442 Stuttgart
• TYROLIT Schleifmittelwerke Swarovski K.G.; A-6130 Schwaz

Bezugszeichen 10 Winkelschleifmaschine 56 Bauteil 12 Mitnahmevorrichtung 58 Bereich 14 Mitnahmevorrichtung 60 Bereich 16 Mitnahmevorrichtung 62 Bereich 18 Einsatzwerkzeug 64 Langloch 20 Federelement 66 Langloch 22 Federelement 68 Langloch 24 Rastelement 70 Bereich 26 Rastelement 72 Bereich 28 Entriegelungstaste 74 Bereich 30 Entriegelungstaste 76 Anlagefläche 32 Einsatzwerkzeug 78 Übertragungsfläche 34 Umfangsrichtung 80 Auflagefläche 36 Umfangsrichtung 82 Bauteil 38 Richtung 84 Ausnehmung 40 Befestigungselement 86 Federelement 42 Befestigungselement 88 Auflagefläche 44 Richtung 90 Bauteil 46 Ausnehmung 92 Bund 48 Ausnehmung 94 Werkzeugnabe 50 Ausnehmung 96 Gehäuse 52 Werkzeugnabe 98 Handgriff 54 Antriebswelle 100 Getriebegehäuse 102 Handgriff 152 Sperrsegment 104 Durchgangsbohrung 154 Sperrsegment 106 Segment 156 Sperrsegment 108 Ausnehmung 158 Ausnehmung 110 Sprengring 160 Ausnehmung 112 Ausnehmung 162 Ausnehmung 114 Schleifmittel 164 Auflagefläche 116 Zentrierbohrung 166 Auflagefläche 118 Mitnahmeflansch 168 Auflagefläche 120 Gewinde 170 Vorsprung 122 Segment 172 Federelemente 124 Segment 174 Federelemente 126 Segment 176 Federelemente 128 Zwischenraum 178 Ausnehmung 130 Zwischenraum 180 Auflagefläche 132 Zwischenraum 182 Mitnahmevorrichtung 134 Nut 184 Mitnahmevorrichtung 136 Nut 186 Einsatzwerkzeug 138 Nut 188 Einsatzwerkzeug 140 Drehanschlag 190 Rastelement 142 Drehanschlag 192 Rastelement 144 Drehanschlag 194 Rastelement 146 Rastzapfen 196 Rastelement 148 Rastzapfen 198 Rastelement 150 Rastzapfen 200 Rastelement 202 Mitnahmeelement 258 Gewinde 204 Mitnahmeelement 260 Stirnseite 206 Mitnahmeelement 262 Bund 208 Mitnahmeelement 264 Auflagefläche 210 Mitnahmeelement 266 Zentrierbund 212 Mitnahmeelement 268 Zentrierbohrung 214 Langloch 270 Bereich 216 Langloch 272 Bereich 218 Langloch 274 Bereich 220 Langloch 276 Nase 222 Langloch 278 Anlagefläche 224 Langloch 226 Übertragungsfläche 300 Mitnahmevorrichtung 228 Bauteil 302 Rastelement 230 Bauteil 304 Bauteil 232 Auflagefläche 306 Element 234 Bauteil 308 Bauteil 236 Ausnehmung 310 Schrägfläche 238 Bereich 310a Kante 240 Bereich 312 Federelement 242 Bereich 314 Ausnehmung 244 Bereich 316 Bereich 246 Bereich 318 Bereich 248 Bereich 320 Ausnehmung 250 Endstellung 322 Bund 252 Endstellung 254 Endstellung 256 Mitnahmeflansch Alternatively, the fasteners and the slots in the sheet metal hub can be performed rotated by 180 °, so that the mounting direction reverses, and the sheet metal hub is rotated during assembly in the drive direction. If the fasteners are designed to be twisted by 180 °, an inclined surface precedes a lower end edge of the fastener in operation, so that injuries can be avoided by the front edge.

• ROBERT BOSCH GMBH; D-70442 Stuttgart
• TYROLIT Schleifmittelwerke Swarovski KG; A-6130 Schwaz

reference numeral 10 angle grinder 56 component 12 driving device 58 Area 14 driving device 60 Area 16 driving device 62 Area 18 application tool 64 Long hole 20 spring element 66 Long hole 22 spring element 68 Long hole 24 locking element 70 Area 26 locking element 72 Area 28 release 74 Area 30 release 76 contact surface 32 application tool 78 transfer surface 34 circumferentially 80 bearing surface 36 circumferentially 82 component 38 direction 84 recess 40 fastener 86 spring element 42 fastener 88 bearing surface 44 direction 90 component 46 recess 92 Federation 48 recess 94 tool hub 50 recess 96 casing 52 tool hub 98 handle 54 drive shaft 100 gearbox 102 handle 152 locking segment 104 Through Hole 154 locking segment 106 segment 156 locking segment 108 recess 158 recess 110 snap ring 160 recess 112 recess 162 recess 114 abrasive 164 bearing surface 116 centering 166 bearing surface 118 driving flange 168 bearing surface 120 thread 170 head Start 122 segment 172 spring elements 124 segment 174 spring elements 126 segment 176 spring elements 128 gap 178 recess 130 gap 180 bearing surface 132 gap 182 driving device 134 groove 184 driving device 136 groove 186 application tool 138 groove 188 application tool 140 rotary stop 190 locking element 142 rotary stop 192 locking element 144 rotary stop 194 locking element 146 latching pin 196 locking element 148 latching pin 198 locking element 150 latching pin 200 locking element 202 driving element 258 thread 204 driving element 260 front 206 driving element 262 Federation 208 driving element 264 bearing surface 210 driving element 266 spigot 212 driving element 268 centering 214 Long hole 270 Area 216 Long hole 272 Area 218 Long hole 274 Area 220 Long hole 276 nose 222 Long hole 278 contact surface 224 Long hole 226 transfer surface 300 driving device 228 component 302 locking element 230 component 304 component 232 bearing surface 306 element 234 component 308 component 236 recess 310 sloping surface 238 Area 310a edge 240 Area 312 spring element 242 Area 314 recess 244 Area 316 Area 246 Area 318 Area 248 Area 320 recess 250 end position 322 Federation 252 end position 254 end position 256 driving flange

Claims (13)

1. Grinding-machine tool receptacle, in particular for a hand-held angle grinding machine (10), having an entrainment device (14) by way of which an insert tool (18) is operatively connectable to a drive shaft (54), wherein the insert tool (18) is operatively connectable to the entrainment device (14) by way of at least one latching element (24) that is movable counter to a spring force and that latches in an operating position of the insert tool (18), fixing the insert tool (18) in a form-fitting manner, wherein the insert tool (18) in the circumferential direction (34, 36) at least by way of the latching element (24) and in the axial direction (38) by way of at least one further latching element (42) is connected to the entrainment device (14), characterized in that the further latching element (42) fixes the insert tool (18) in a form-fitting manner in the axial direction, wherein the further latching element (42) is mounted so as to be movable counter to a spring element (86).
2. Grinding-machine tool receptacle according to Claim 1, characterized in that the spring force acts in the axial direction (44).
3. Grinding-machine tool receptacle according to Claim 1 or 2, characterized in that a drive torque is transmittable between the insert tool (18) and the entrainment device (14) by way of a form-fitting connection.
4. Grinding-machine tool receptacle according to one of the preceding claims, characterized in that the insert tool (18) is connectable to the entrainment device (14) by way of at least one entrainment element that is disposed on the insert tool (18), and/or on the entrainment device (14), extends in the axial direction (38), is guidable through at least one region of a slot of the respective mating component, is displaceable along the slot, and in a terminal position is fixable by way of the further latching element (42).
5. Grinding-machine tool receptacle according to Claim 4, characterized in that the insert tool (18) is fixable in a form-fitting manner in the axial direction (38) by way of a bearing face of the entrainment element.
6. Grinding-machine tool receptacle according to Claim 1, characterized in that the further latching element that generates the spring force is integrally embodied with a tool hub of the insert tool.
7. Grinding-machine tool receptacle according to Claim 6, characterized in that at least one clearance into which part of the tool hub in an operating position of the insert tool is elastically impressed is incorporated in a component of the entrainment device that forms a bearing face for the insert tool.
8. Grinding-machine tool receptacle according to Claim 6 or 7, characterized in that the slot is incorporated in the tool hub of the insert tool, and at least the further latching element is formed in the region of the slot by part of the tool hub.
9. Grinding-machine tool receptacle according to Claims 4 and 8, characterized in that the slot has a wide region and, in front of a terminal position of the entrainment element, has at least one narrow region that forms the further latching element.
10. Grinding-machine tool receptacle according to one of the preceding claims, characterized in that at least the latching element (24) is mounted so as to be movable counter to a spring element (20).
11. Grinding-machine tool receptacle according to Claim 10, characterized in that the latching element (24) is releasable from the latching position thereof by way of an unblocking button (28).
12. Grinding-machine tool receptacle according to one of the preceding claims, characterized in that at least the latching element is integrally moulded on a disc-shaped component.
13. Grinding-machine tool receptacle according to one of the preceding claims, characterized in that at least two elements for fixing the insert tool in the axial direction (38) are integrally moulded on a disc-shaped component.

Images