EP0962283A1 - Hand-held power tool - Google Patents

Abstract

The device has a tool (22) fixed between a holder part (14) at the tool-sided end (12) of the working spindle (11), and a fastener flange (15). The flange is rigidly connected to an axially moveable tension bolt (17), which passes through an expander element (19). The element is used to tension the bolt against the working spindle. An intermediate flange (16) connected to the expander element is located between holder part and flange. The bolt has a conical tension part (18) acting with an expander cone (20) on the expander element.

Description

The invention relates to a power-operated hand tool an oscillating work spindle for driving a tool, where the tool is between a stop section a first tool-side end of the work spindle and one Mounting flange is fixable.

Such a power-driven hand tool is from the EP-B-0 244 465 known. A grinding tool is used an oscillation drive with high frequency and small swivel angle in an oscillating movement around the longitudinal axis of the tool. The attachment of the Tool on the work spindle usually by means of a central Fixing screw or by means of a central Mounting flange.

Such grinding tools, usually with a triangular shape Grinding surface equipped with convex outer edges have become more and more on the market in recent years enforced and are known as "triangular grinders" known.

As a disadvantage, it has been found that the Grinding tool only with the help of an auxiliary tool, such as a wrench or screwdriver, attached to or detached from the work spindle can.

Furthermore, from US-A-3 376 675 is a rotatingly driven one Hand tool known that has a grinding head, on the Underside of sandpaper using a conical mounting flange can be spanned by a spring-loaded Tension anchor is applied in such a way that the sandpaper is securely clamped.

The well-known hand tool is only for a rotating drive suitable and has the disadvantage that the clamping and Loosening the sandpaper is relatively expensive and that Tensioning device is relatively complicated and therefore expensive to build is.

Furthermore, an angle grinder is known from JP-A-49-6431, in which the grinding wheel with the help of a flange-like elastic Clamping element in a central fastening opening the grinding wheel engages with the interposition of a Spreading element with a central, axially displaceable Spike is connected to the work spindle can be clamped.

Here too, the structure and mode of operation of the tensioning device relatively complicated.

Another power-driven hand tool of a similar design is known from DE-A-3 603 384.

Here, a disc-shaped tool is placed between two clamping flanges clamped against using a proppant axial displacement on a work spindle are secured, the proppant arbitrarily for evading a Support position can be released. Serve as a support in a space between the work spindle and the one clamping flange introduced rolling elements that are transverse to their direction of support arbitrary, e.g. by means of a pen into an alternative room are movable. This way, a tool-less Tool change possible.

This known tool also has a structure and mode of operation the clamping device for the tool is relatively complicated and complex to manufacture.

Finally, reference is made to DE-A-1 677 134, from which a rotating powered hand tool is known in which a Tool in the form of a polishing brush on the work spindle facing side is provided with a permanent magnet, by which the work spindle is carried along. To a To enable the polishing tool to be detached from the machine the work spindle is penetrated by a push rod, at whose Actuation the force of the permanent magnet can be overcome can and the polishing tool is released from the work spindle.

Such an arrangement is basically for attachment of the tool on the machine, but allows it not, the tool between a machine-side holding section and tighten a mounting flange like this is required for numerous applications.

The invention is therefore based on the object of an improved to create oscillating hand tools which enables a manual change of the tool. Here structure and handling should be kept as simple as possible.

According to a first alternative of the invention, this object is achieved in the case of a power-driven hand tool in accordance with the aforementioned Art solved in that the mounting flange with an axially displaceable tension anchor is rigidly connected penetrates an expansion element, by means of which the tension anchor can be clamped against the work spindle.

The object of the invention is completely achieved in this way.

By combining the tension anchor with a spreading element creates a simple clamping unit, by means of which the tension anchor on the work spindle in a particularly simple manner is fixable.

This clamping unit only has to go through a fastening opening of the tool and can be inserted directly on the work spindle, preferably as a hollow spindle is designed to be attached by the tension anchor is moved relative to the expansion element, so that a Spreading of the clamping element and thus a non-positive Connection to the work spindle.

According to a development of the invention, one with the expansion element connected intermediate flange provided between the mounting flange and the holding portion is arranged.

This enables particularly simple handling, since the clamping unit simply by pulling on the tool the work spindle can be released.

There can be an additional one between the work spindle and the expansion element positive driving connection, e.g. in the form of a corrugation or another Vorschlußelementes, be provided to the To improve power transmission between the tie rod and the work spindle.

Additionally or alternatively, the dimensions are preferred of tension anchor, expansion element and work spindle so on top of each other voted that in normal operation without a high clamping force a sufficiently secure connection to the The tool is driven by the work spindle.

For this purpose, the tension anchor is preferably against the expansion element elastic pre-tensioned.

Especially when the power-operated hand tool as a triangular grinder is used is only a slight elastic Preload is required to ensure a sufficiently secure, non-positive Transmission between work spindle and tool too guarantee. This is reinforced by the fact that the tool with intended grinding or polishing work only is stressed, causing the power transmission between tool and work spindle is still improved.

The expansion cone is preferably on a second, the First end opposite end of the work spindle is provided.

In this way it is possible at the end facing away from the tool to provide a pressure piece or the like that comes out of the housing protrudes so as to easily loosen the connection between Allow tool and work spindle.

Alternatively, an actuating element can be on the mounting flange be provided that pulling out the tension anchor enables.

This also makes it easy to loosen the connection between tool and work spindle.

According to an alternative embodiment of the invention, the object with a power-driven hand tool according to the entry mentioned type in that the mounting flange with an axially displaceable tension anchor is connected by means of a spring ring or O-ring on a groove or a web the work spindle can be fixed.

This is also a particularly simple and affordable reliable connection between tool and Reach the work spindle.

The dimensioning of the spring washer and groove is preferred matched so that when inserting the tension anchor in the work spindle, the clamping anchor is locked with the Spring ring results, so that the tool non-positively between Mounting flange and holding section is held.

This version is particularly simple and inexpensive construction and is therefore particularly suitable for Attachment of grinding or polishing tools to the work spindle suitable.

A loosening of the connection between tool and work spindle can be easily achieved in that the tool gripped by hand and against the tension of the Spring rings or O-rings pulled out of the work spindle becomes. An actuating element on the mounting flange, e.g. in the manner of a ring. Especially at the use of a grinding or polishing tool as a tool, an abrasive in the form of an abrasive paper with Attached to the surface using a Velcro adhesive is such an actuator can be easily place in the central recess of the grinding tool, in which the mounting flange is received anyway and the when applying sandpaper to the Velcro adhesive material is covered.

According to a further alternative of the invention, the object in the case of a power-driven hand tool in accordance with the aforementioned Art solved in that the mounting flange with a clamping sleeve is connected, which is penetrated by a clamping anchor is that between a clamping position in which the clamping sleeve is clamped against the work spindle, and a release position is movable.

In this way too, the object of the invention is accomplished solved. Again, a simple and reliable connection achieved between tool and work spindle, which can be released manually is.

According to a development of this version, the work spindle formed as a hollow spindle, the clamping sleeve a has conical section into which the tension anchor with a Clamping cone engages by means of an elastic element is clamped against the conical section around the mounting flange to act against the holding portion.

In this way, tensioning the tension anchor against the Working spindle in a particularly convenient and reliable manner enables.

According to a development of this version, the conical Section of the adapter sleeve is slotted in the axial direction.

Through this measure, an additional spring action of the Collet reached in their conical area, which in connection with the tension cone of the tension anchor to a particularly reliable Leads to tension with a high tension.

According to a further alternative of the invention, the object in the case of a power-driven hand tool in accordance with the aforementioned Art solved in that the mounting flange with an axially displaceable tension anchor is rigidly connected through a fastening opening of the tool in the work spindle insertable and by a positive lock against twisting is secured and via at least one in a recess of the Rolling body engaging the work spindle against axial displacement can be locked.

In this way too, the object of the invention is accomplished solved. The connection and detachment of the tool from the work spindle is particularly easy.

According to a further development of this embodiment, a between a clamping position and a release position axially displaceable Cage provided, which is elastic towards the clamping position is biased, which is a lateral in the release position Dodging the at least one rolling body allowed to one To allow insertion and removal of the tension anchor, and the at least one rolling element in the tensioned position against lateral escape from the recess backs up.

As a result, a particularly reliable attachment of the Tool on the work spindle ensures that simple by axially moving the cage with which the or Rollers can be performed, manufactured and solved.

According to a further development of this embodiment, the recess is designed as a radial bore on the work spindle and the Rolling body designed as a ball in an oblique escape opening out of the cage and against a circumferential groove of the Tension anchor is prestressed.

In this way it becomes a particularly simple and reliable Locking of the tool in the clamping position guaranteed.

According to another variant, the at least one rolling body is held captive in a radial hole in the tension anchor and by an annular spring enclosing the tension anchor against a Pre-stressed circumferential groove of the tension anchor.

This enables a particularly simple and inexpensive Construction.

According to a further alternative of the invention, the object in the case of a power-driven hand tool in accordance with the aforementioned Art solved in that the mounting flange with an axially displaceable tension anchor is rigidly connected, and that a magnet is provided between the tie rod and the work spindle is.

This version is also a particularly simple and easy to handle attachment of the tool to the work spindle enables.

The magnet can either be on the work spindle or on Anchors must be attached.

In this and in the aforementioned versions can additionally a positive fit between the tool and the holding section Connection may be provided.

This results in a particularly reliable power transmission the tool ensures.

It is understood that the above and those below Features of the invention to be explained not only in the specified combination, but also in others Combinations or alone can be used without the Leave the scope of the invention.

Fig. 1

ein erstes Ausführungsbeispiel der Erfindung in geschnittener, stark vereinfachter Ausführung;

Fig. 2

einen Schnitt längs der Linie II-II gemäß Fig. 1, auf dem lediglich Arbeitsspindel, Spannelement und Spannanker dargestellt sind;

Fig. 3

eine zweite Alternative der Erfindung in geschnittener, stark vereinfachter Darstellung;

Fig. 4

eine weitere Variante der Erfindung in stark vereinfachter, geschnittener Darstellung;

Fig. 5

einen vergrößerten Ausschnitt aus Fig. 4 im Bereich des Befestigungsflansches;

Fig. 6

eine weitere Variante der Erfindung in stark vereinfachter, geschnittener Darstellung;

Fig. 7

eine weitere Variante der Erfindung in vergrößerter Schnittdarstellung im Bereich der Verbindung zwischen Arbeitsspindel und Werkzeug;

Fig. 7a

eine Abwandlung der Ausführung gemäß Fig. 7;

Fig. 8

eine weitere Ausführung der Erfindung in stark vereinfachter, vergrößerter Darstellung, lediglich im Bereich der Verbindung zwischen Werkzeug und Arbeitsspindel und

Fig. 9

eine Abwandlung der Ausführung gemäß Fig. 8.

Further features and advantages of the invention result from the following description of preferred exemplary embodiments with reference to the drawing. Show it:

Fig. 1

a first embodiment of the invention in a cut, highly simplified version;

Fig. 2

a section along the line II-II of Figure 1, on which only the work spindle, clamping element and clamping anchor are shown.

Fig. 3

a second alternative of the invention in a sectional, highly simplified representation;

Fig. 4

a further variant of the invention in a greatly simplified, sectional representation;

Fig. 5

an enlarged section of Figure 4 in the region of the mounting flange.

Fig. 6

a further variant of the invention in a greatly simplified, sectional representation;

Fig. 7

a further variant of the invention in an enlarged sectional view in the area of the connection between the work spindle and tool;

Fig. 7a

a modification of the embodiment of FIG. 7;

Fig. 8

a further embodiment of the invention in a greatly simplified, enlarged view, only in the area of the connection between the tool and the work spindle

Fig. 9

a modification of the embodiment according to FIG. 8.

1 shows a power-driven hand tool according to the invention designated overall by the number 10.

In the drawing, a housing 29 is purely schematic indicated, in which an electric motor 31 is received, the a work spindle via an oscillation drive 30 of a known type 11 drives by the oscillation drive 30 with high frequency in the order of about 10,000 and 25,000 oscillations per minute and with a small swivel angle approximately in the range between 0.5 and 7 ° around the longitudinal axis 32 is driven oscillating.

At a first, outer end 12 of the work spindle is a tool designated overall with the number 22 in the following attached described in more detail. With the tool it is a triangular grinding disc with convex Outer edges, as known from EP-B-0 244 465 is.

The tool 22 thus comprises a support plate 23 which by a central fastening opening 27 is penetrated. On the support plate is a relatively hard foam Support body 24 added, on the underside of a Velcro adhesive material 25 is provided. On the Velcro adhesive material 25 can a grinding or polishing element 26 by means of the Velcro adhesive material be attached in a known manner. Below the fastening opening 27 is inside the support body 24 a recess 28 is provided which accommodates a mounting flange 15 allowed. The mounting flange 15 is with a cylindrical tension anchor 17 rigidly connected to the the mounting flange 15 facing away from a conical end Section 18 is provided. Of the tension anchor 17 is a spreading element 19 coaxially penetrates the conical section 18 of the tension anchor 17 one to the conical Section of the slope after the adjusted expansion cone 20 having. At its end facing the mounting flange 15 an intermediate flange 16 is molded onto the expansion element 19, the support plate 23 against the retaining section 14 of the work spindle 11 acted upon. This is between the intermediate flange 16 and the mounting flange 15 a compression spring 21st provided through which the conical section 18 of the tension anchor 17 is applied against the expansion cone 20.

The dimensions of tension anchor 17, expansion element 19 and the inner surface of the work spindle designed as a hollow spindle 11 are now coordinated so that the spreading, the expansion element 19 through the conical section 18th experienced, sufficient to have an adequate, force-locking connection between the work spindle 11 and the tool 22. In addition, there can also be a positive connection between Work spindle and tool may be provided.

If the tool 22 is to be replaced, only that Tool 22 in the direction of arrow 35 against the action of Compression spring 21 can be pulled outwards. As a result of this the expansion element 19 is no longer spread so much that the Tension anchor 17 together with the expansion element 19 from the work spindle 11 can be pulled out and the tool 22nd can thus be removed.

The attachment of the tool 22 takes place in the opposite direction. For this purpose, the tension anchor 17 is together with the Spreading element 19 through the fastening opening 27 of the tool 22 inserted into the work spindle 11 and against the action of the compression spring 21 pressed in the direction of the arrow 34, until the intermediate flange in the recess 28 from the inside abuts the support plate 23 and finally under spring tension is held so that the tool 22 against the Holding section 14 of the work spindle 11 is clamped. Subsequently can a piece of sandpaper 26 by means of the Velcro adhesive material 25 are attached to the surface of the support body 24.

To additionally take along between work spindle 11 and To improve expansion element 19, a positive connection between the two e.g. be provided as profiling or corrugation 33, as indicated in Fig. 2.

A variant of the embodiment according to FIG. 1 is shown in FIG. 3 and designated overall by the number 40.

Again, the hand tool 40 has one not shown in FIG Has oscillating driven work spindle 41, having a first, outer end 42 on which a holding section 44 is in the form of a flange, and with a second, end 43 opposite first end 42. a total Tool designated with the number 52, which in turn as Grinding tool according to that previously described with reference to FIG. 1 Execution can be formed with its support plate 53 on the holding section 44 by means of a fastening flange 45 held with a rigid anchor 47 held in a spreading element 49 under the tension of a spring 51 is. The tension anchor 47 has on its the mounting flange 45 opposite end a conical section 48 on, which is followed by an extension 54 by a Printing stick 46 is completed. The expansion element 49, the the tension anchor 47 is penetrated, points in the region of the conical Section 48 a correspondingly inclined expansion cone 50 on. Between the end face of the expansion element 49 and the Pressure piece 46 is held a spring 51 through which the Tension anchor 47 with its conical section 48 against the Expansion cone 50 of the expansion element is applied. The Spreading element 49 is spread slightly under the action of spring 51, so that the tension anchor 47 frictionally in the work spindle 41 is included. Thus, the tool is 52 frictionally between the mounting flange 45 and the holding portion 44 clamped.

The tension anchor 47 can be used for the purpose of achieving a better one Preload force can also be hollow and in the area of the conical Section 48 may be slotted.

To remove it is an actuating element 55 in the form of a foldable bracket provided on which the entire tensioning unit can be pulled out. If the work spindle 41 its end facing away from the tool 52 is accessible can alternatively be the pressure piece 46 against the action the spring 51 are pressed so that the spread of the Spreading element 49 is lifted and the tension anchor 47 together Spreading element 49 are pulled out of the work spindle 41 can.

Another embodiment of the invention is shown in FIG. 4 overall designated with the number 60.

Within a housing, which is only indicated schematically 79 is a work spindle 61 designed as a hollow spindle provided in a known manner by a not shown Oscillatory drive is driven. In the work spindle 61, an adapter sleeve 69 is received on the tool 72 facing end is spread out conically and with a conical section 70 on a conical inner surface 76 of the work spindle 61 rests in this area. At the outer end of the clamping sleeve 69 is a mounting flange 64 molded, by means of which the tool 72 against a holding portion 64 in the form of a flange at the first, outer end 62 the work spindle 61 can be clamped.

A clamping anchor 67 is received within the clamping sleeve 69, at its outer, tool-side end by a clamping cone 68 is completed, the slope of the conical section 70 of the adapter sleeve 69 is adapted. The adapter sleeve 69 has a shoulder 79a approximately in the middle of its longitudinal extent on which a compression spring 71 rests, the other End engages a shoulder 79b of the tension anchor 67 to this towards the second, first end 62 of the work spindle 61 act opposite end. Through the Spring preload is the clamping sleeve 69 on its conical Section 70 widened outwards with the help of the tensioning cone 68, so that the clamping sleeve 69 frictionally on the work spindle 61 is held.

This is additionally supported by the fact that the adapter sleeve 69 in the area of its conical section 70 by several, in the axial direction slots 78 is divided, so that the clamping sleeve 69 itself has a spring action in this area owns. The tension anchor 67 can therefore include the tensioning sleeve 69 through the fastening opening 77 of the tool 72 into the Work spindle 61 inserted and pressed until they under spring tension in the work spindle 61 frictionally is held so that the tool 72 with its support plate 73rd through the mounting flange 65 securely against the holding portion 64 is braced.

The tension anchor 67 is on its opposite the tool 72 End extended by a pressure piece 66 that outwards protrudes from the housing 79.

This enables easy removal of the tool 72, by applying pressure to the pressure piece 66. The Tool 72 can then be together with clamping anchor 67 and clamping sleeve 69 take it out easily.

Due to the larger span than in the version according to Figures 1 to 3 can also design the mounting flange 65 be that this when moving the clamping cone 68 so far retracts that the mounting flange 65 through the mounting opening 77 can be pulled.

The tool 72 can in turn, as previously based on the Fig. 1 shown on the underside of the support plate 73 with be provided a support body 74 on which a Velcro adhesive material intended to hold a grinding or polishing agent is.

Another embodiment of a hand tool according to the invention is shown in Fig. 6 and overall with the number Designated 80.

The hand tool 80 in turn has one not shown in FIG Way driven work spindle 81, in the one Anchor 87 can be inserted, at the outer end of a mounting flange 85 is provided. The tension anchor 87 can by inserted a fastening opening 97 of a tool 92 be by means of a support plate 93 of the tool 92 of the mounting flange 85 against a holding portion 84 on to clamp the first end 82 of the work spindle 81.

For this purpose, a circumferential groove 90 is provided on the tension anchor 87, the a spring ring 88 is assigned, which in an inner groove 89 the work spindle 81 is held. Location and dimensions of inner groove 89, spring washer 88, circumferential groove 90, and the strength the support plate 93 of the tool 92 are matched to one another in such a way that when inserting the tension anchor 87 through the Fastening opening 97 in the opening of the work spindle 81 and when pressing the mounting flange 85 against the work spindle 81 finally, in the end position, the Spring washers 88 take place in the circumferential groove 90 and thus the tool 92 securely frictionally by means of the mounting flange 85 is clamped against the holding section 84. The spring washer 88 can advantageously be a standardized O-ring.

In order to replace the tool 92, this can be done on an actuating element 86 that on the outside of the mounting flange 85 provided in the form of a hinged ring or an eyelet is to be grasped and pulled outwards.

It is also possible to use an actuating element 86 of this type to be dispensed with entirely and the tool 92 only from the outside to grasp by hand and against the resistance of the spring ring 88 pull outwards.

In the manner described above is again on the bottom the support plate 93 is provided with a support body made of solid foam, on which by means of Velcro adhesive material 95 about an abrasive paper 96 can be attached.

It goes without saying that instead of fastening with Velcro adhesive material Self-adhesive grinding or polishing elements are also used can be or that the support body 94 itself directly can be formed as an abrasive body, e.g. with diamond grinding wheels can be coated.

Another embodiment of the invention is shown in FIG. 7 and designated overall by the number 100.

This enlarged view is in turn in a housing 119 a work spindle 101 by means of several bearings, from one of which is indicated by the number 110, around its longitudinal axis rotatably mounted and by means of a not shown Rotary drive for rotating drive or by means of an oscillation drive for the oscillating drive of the Tool 112 driven. On the outside facing the tool 112 The end of the work spindle 101 is a recess in shape an internal hexagon 103 is provided, into which a tension anchor 107 insertable with a correspondingly shaped external hexagon 102 is. At the outer end of the tension anchor 107 is a mounting flange 105 rigidly attached, with a paragraph in a mounting hole 117 on a support plate 113 of a tool 112 engages. For example in the last one, facing away from tool 112 A circumferential groove 122 is provided third of the external hexagon 102, into which a rolling element in the form of a ball 121 engages.

Around the ball 121 in the locking position shown in FIG. 7 to hold, a cage 120 is provided on the Working spindle 101 fixed in the axial direction is. An inclined guide opening 123 is provided in the cage 120, in which the ball 121 is movable. In Fig. 7 Lock position shown engages the ball 121 in a radial bore 125 of the work spindle 101 and lies in the circumferential groove 122 of the tension anchor 107 and is thereby from outside through the slope of the guide opening 123 in this position held. The cage 120 is acted upon by a spring 124, which in an annular cavity 126 between the Cage 120 and the work spindle 101 is held on her End facing the tool 112 on a lock washer 108 is held, which is accommodated in the work spindle 101 is. The cage 120 is thus in an opposite to the tool 112 Spring loaded direction, so that the ball 121 in the position shown in Fig. 7 is locked and thus the Tension anchor 107 is secured against axial displacement.

Due to the positive connection of the external hexagon 102 and Hexagon socket 103 is the power transmission from the work spindle 101 guaranteed on the mounting flange 105. There the fastening flange 105 in the locking position shown in FIG. 7 under a certain bias against the flange-shaped holding section 104 of the work spindle 101 is biased, the tool 112 is so frictional between the mounting flange 105 and the holding portion 104 added.

Again, as in the manner already shown, on the A support body 114 is provided on the underside of the support plate 113 on the underside of which is a Velcro adhesive material 115 is attached to an abrasive paper 116 or other Attach the grinding or polishing element in a detachable manner to be able to. Here, the sandpaper 116 can the recess 118, which in the support body 114 for receiving the mounting flange 105 is provided, completely cover.

A modification of the embodiment according to FIG. 7 is a detail shown in Fig. 7a.

This is a modification of the previous version waived the cage. Instead, the rolling body 121a is the is again formed as a ball, only by an annular spring 127 held, which surrounds the tension anchor 107a from the outside and the ball against a circumferential groove 122a of the tension anchor 107a preloaded. The ball is again in a radial bore 125a movable in tension anchor 107a, but is in unspecified way against falling out inwards secured when pulling out the tension anchor 107a. For axial Setting the ring spring 127 can also be a lock washer 128 may be provided.

Two further embodiments of the invention are as follows represented extremely schematically with reference to FIGS. 8 and 9 and generally designated with the numbers 130 and 150.

In both cases, a magnet is used to secure it of the tool on the work spindle.

8, the work spindle 131 has a cylindrical shape Extension 139 on, in the clamping position shown in Fig. 8 from a cylindrical recess 140 of a tension anchor 137 is enclosed. At the bottom of the recess 140 is a disc-shaped permanent magnet 138 is pressed through which the Tension anchor is held magnetically on the work spindle 131, for this purpose at least in the area of the extension 139 a ferromagnetic material. The tension anchor 137 is rigidly connected to a mounting flange 135 which of rests on the outside of the surface of the tool 142 to this so to brace against the holding portion 134 of the work spindle 131. In addition, a positive connection between the tension anchor 137, the extension 139 and the tool 142 may be provided.

Should the connection between tool 142 and work spindle 131 be solved, so only the tool 142 with the Hand can be grasped from the outside and after overcoming the magnetic holding force withdrawn from the work spindle 131 become.

FIG. 9 shows a modification of the embodiment according to FIG. 8, where the permanent magnet is not on the mounting flange or tension anchor is provided instead on the work spindle 151 received in a bore 160 of the same is.

In this embodiment, the tension anchor 157 engages a ferromagnetic material is in the bore 160 am outer end of the work spindle 151 and is in the in Fig. 9 shown clamping position by the magnetic force of Permanent magnet 158 held. The tool 162 is thus again through the mounting flange 155, which is connected to the tension anchor 157 is rigidly connected to the holding section 154 of the work spindle 151 held by the magnetic force.

For the purpose of better power transmission is on the face the work spindle 151 a driving pin 164 is provided, which in a corresponding bore of the tool 162 in a form-fitting manner intervenes.

Claims (20)

Power-driven hand tool with an oscillating one Working spindle (11, 41) for driving a tool (22, 52), in which the tool (22, 52) between a holding section (14, 44) at a first end on the tool side (12, 42) of the work spindle (11, 41) and a mounting flange (15, 45) can be fixed, characterized in that that the mounting flange (15, 45) with an axial displaceable tension anchor (17, 47) is rigidly connected, which passes through an expansion element (19, 49), by means of which the tension anchor (17, 47) against the work spindle (11, 41) is tense. Hand tool according to claim 1, characterized in that an intermediate flange connected to the expansion element (19) (16) is provided between the mounting flange (15) and the holding section (14) is arranged. Hand tool according to claim 1 or 2, characterized in that the tension anchor (17, 47) has a conical shape Has clamping section (18, 48) with a Expansion cone (20, 50) on the expansion element (19, 49) for expansion of the expansion element (19, 49) cooperates. Hand tool according to claim 1, 2 or 3, characterized in that that the tension anchor (17, 47) against the expansion element (19, 49) is elastically biased. Hand tool according to claim 3 or 4, characterized in that that the expansion cone (20, 50) on a second (13, 43), the first (12, 42) end opposite the end of the Working spindle (11, 41) is provided. Power-driven hand tool with an oscillating one Working spindle (81) for driving a tool (92), at which the tool (92) between a holding section (84) at a first tool-side end (82) of the work spindle (81) and a mounting flange (85) can be fixed is characterized in that the mounting flange (85) with an axially displaceable tension anchor (87) rigid is connected, which is by means of a spring ring (88) or O-rings on a groove (89) or a bar on the work spindle (81) can be fixed. Power-driven hand tool with an oscillating one Working spindle (61) for driving a tool (72), at which the tool (72) between a holding section (64) at a first tool-side end (62) of the work spindle (61) and a mounting flange (65) can be fixed is characterized in that the mounting flange (65) with an adapter sleeve (69) connected by a tension anchor (67) is penetrated between one Clamping position in which the clamping sleeve (69) against the Work spindle (61) is clamped, and a release position is movable. Hand tool according to claim 7, characterized in that the work spindle (61) is designed as a hollow spindle, that the clamping sleeve (69) has a conical section (70) in which the tension anchor (67) with a tension cone (68) engages by means of an elastic element (71) is braced against the conical section (70) the mounting flange (65) against the holding section (64) to act upon. Hand tool according to claim 8, characterized in that the conical section (70) of the clamping sleeve (69) in the axial direction is slotted. Power-driven hand tool with an oscillating one Work spindle (101) for driving a tool (112), in which the tool (112) between a holding section (104) at a first tool-side end of the work spindle (101) and a mounting flange (105) can be fixed is characterized in that the mounting flange (105) with an axially displaceable tension anchor (107) is rigidly connected by a mounting hole (117) of the tool (112) in the work spindle (101) can be inserted and by means of a positive connection (102, 103) is secured against rotation and via at least one engaging in a recess (122) of the work spindle (101) The rolling element (121) can be locked against axial displacement is. Hand tool according to claim 10, characterized in that one between a clamping position and a release position axially displaceable cage (120) is provided, which in Is elastically biased towards the clamping position, the lateral evasion of the at least in the release position a rolling element (121) allows for insertion and to allow the tension anchor (107) to be pulled out, and which the at least one rolling element (121) in the Tension position against lateral escape from the recess (122) saves. Hand tool according to claim 11, characterized in that the recess (122) as a radial bore (125) on the work spindle (101) is formed, and that the rolling body (121) is designed as a ball, which is inclined Dodge opening (123) of the cage (120) is guided and biased against a circumferential groove (122) of the tension anchor (107) is. Hand tool according to claim 10, characterized in that the at least one rolling element (121a) in a radial bore (125a) is held captive in the tension anchor (107a) and by an annular spring enclosing the tension anchor (107a) (127) against a circumferential groove (122a) of the tension anchor (107a) is biased. Power-driven hand tool with an oscillating one Working spindle (131, 151) for driving a tool (142, 162), in which the tool (142, 162) between a Holding section (134, 154) on a first tool-side End of the work spindle and a mounting flange (135, 155) can be fixed, characterized in that the Mounting flange (135, 155) with an axially displaceable Anchor (137, 157) is rigidly connected, and that between tension anchor (137, 157) and work spindle (131, 151) a magnet (138, 158) is provided. Hand tool according to claim 14, characterized in that the magnet (158) is attached to the work spindle (151) is. Hand tool according to claim 15, characterized in that the magnet (158) is attached to the tension anchor (151). Hand tool according to one of the preceding claims, characterized characterized in that between the tool (22, 52, 72, 92, 112, 142, 162) and the holding section (14, 44, 64, 84, 104, 134, 154) a positive connection is provided is. Hand tool according to one of the preceding claims, characterized characterized in that on the mounting flange (15, 85, 105) an actuating element accessible from the tool side (16, 86, 106) for pulling out the tension anchor (17, 87, 107) is provided. Hand tool according to one of the preceding claims, characterized characterized in that at one the first end of the Working spindle opposite second end (43, 63) a pressure piece (44, 66) is provided, by means of which the Tension anchors (47, 67) against the action of the elastic Preload from a clamping position to a release position is axially displaceable. Hand tool according to one of the preceding claims, characterized characterized in that the work spindle (11, 41, 61, 81, 101, 131, 151) connected to an oscillation drive is, the work spindle oscillating about its longitudinal axis (32) drives.

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