EP2103383B1 - Hand tool device - Google Patents

Description

The invention relates to a hand tool with a tool flange for a rotating drivable planar tool having drive spindle, with a screwed onto the free end of the drive spindle and the tool against the tool flange against rotation clamped clamping nut and arranged on the side facing away from the tool flange of the tool and a An actuating element having relief device whose axial extent is reduced to release the clamping nut, wherein the relief device comprises a first functional part and a second functional part, between which a wedge-like inclined surface exhibiting clamping body and a control body is arranged, wherein the actuating body the clamping body against movement set radially outwards, so that the clamping body supports the first functional part and the second functional part in the axial direction.

Since the clamping nut during operation of the hand tool rather tightens further, the clamping nut is often not or very difficult to solve. Therefore, was with WO-A-90/00463 already proposed a generic relief device.

When turning the actuator after WO-A-90/00463 comes the adjusting body with a recess in the actuating element into engagement. As a result, the clamping body also moves in the radial direction to the outside. As a result, the first functional part and the second functional part move toward one another, so that the axial extent of the relief device is reduced. As a result, the clamping nut can be unscrewed manually from the drive spindle easily.

The present invention is based on the object to provide another expedient design that is compact and economical to produce.

This object is achieved in a hand tool of the type mentioned according to the invention that the actuating body has a non-circular cross section and that it has a maximum radial extent in a first functional position and is rotatable by means of the actuating element about a rotation axis in a second functional position in which Radial extent is reduced, so that the clamping body is movable radially outward and so a reduction of the axial extent of the relief device can be achieved.

In the first functional position of the actuating body, the relief device has its maximum axial extent in which the clamping nut is tightened, and in the second functional position of the actuating body, the relief device has a reduced axial extent in which the clamping nut can be solved. The actuating element can be kept simple in comparison to the previously known actuating element, since the recesses of the previously known actuating element need not be provided in the handheld power tool according to the invention. Thereby, the actuating element may be formed with a smaller wall thickness and the discharge device be made more compact.

It proves to be advantageous if the relief device and the clamping nut are designed as a preassembled module. The individual parts of the unloading device and the clamping nut need not be individually pushed onto the drive spindle during assembly, which simplifies assembly.

In development of the invention, the relief device is integrated in the clamping nut. This allows a compact design of clamping nut and relief device and simplifies the installation of the hand tool.

In addition, it has proven to be advantageous if the first functional part and / or the second functional part has a frustoconical portion, so that the clamping body is pressed by the first functional part and / or by the second functional part radially outward. Preferably, the frustoconical portion with its oblique lateral surface to the axis of rotation of the drive spindle (cone axis) at an angle between 45 ° and 80 °, in particular between 55 ° and 80 °, in particular between 60 ° and 75 ° inclined. As a result, the axially acting pressure force is split into a radially outwardly acting force component, whereby the clamping body is pressed radially outward.

The clamping body may rest linearly on the first functional part and / or on the second functional part. Preference is given to a clamping body which has a wedge-shaped inclined surface. As a result, a surface contact with the functional parts can be achieved, which is considered advantageous.

The wedge-like oblique surface can be formed both on one side and on both sides, ie only in the direction of a functional part or in the direction of both functional parts. When the wedge-like inclined surface is formed corresponding to the frusto-conical portion of the first functional part and / or the second functional part, the frusto-conical portion and the wedge-like inclined surface lie flat against each other. As a result, a power transmission over a large area is achieved and reduces wear of the parts.

In addition, a guide means is provided in development of the invention, which guides the clamping body in the radial direction. The guide means may for example be formed by a groove in the first functional part and / or in the second functional part, which guides the clamping body in the radial direction. In addition, the adjusting body can also form a guide means, which supports the clamping body when moving in the radial direction in the broadest sense and thereby leads.

The non-circular adjusting body preferably has an oval or elliptical cross section.

It has proven to be expedient if the adjusting body is formed substantially columnar, in particular with an oval or elliptical cross section. Due to the columnar configuration of the actuating body, this is not only punctiform but linear on the clamp body. As a result, no voltage peaks occur between the clamping body and the adjusting body, so that the wear is reduced.

It has proven to be advantageous if the actuating element supports the adjusting body in its first functional position radially outside. He is thus with one side on the clamp body and with the other side on the actuator. Advantageously, the two contact surfaces are arranged opposite one another. By the concerns of the actuating body on the actuating element of the actuating body in the first functional position can not escape in the radial direction to the outside and thus supports the clamping body in the first functional position.

Furthermore, it is provided in a further development of the invention that the actuating element in the circumferential direction (based on the Anstriebsspindel) acts on the actuating body. In this case, the actuating element act directly or preferably indirectly on the actuating body.

It has proved to be advantageous if the axis of rotation of the actuating body extends parallel to the axis of the drive spindle. In that case, the axis of rotation of the actuating element and that of the actuating body can run parallel to one another. As a result, the hand tool is compact.

Advantageously, the actuating element can be actuated in the circumferential direction. It is therefore rotated when pressed. This makes it possible that the actuating element, in particular in the circumferential direction of the drive spindle acts on the actuating body in a particularly simple manner.

An embodiment of the relief device is preferred in which the actuating element surrounds the first functional part and the second functional part in the circumferential direction on the outside. The actuating element can be designed as a collar or sleeve. This proves to be advantageous because the actuator is then accessible and operable from all sides.

According to a further inventive concept, a spring element is provided, which biases the actuating body in the first functional position. In this case, the spring element can act indirectly or directly on the actuating body and, for example, comprise a spiral spring. This ensures that the adjusting body, which is manually moved to the second functional position, is automatically returned by the spring element in the first functional position when the clamping nut is released.

It proves to be advantageous if the spring element is arranged axially in the space between the first functional part and the second functional part.

In addition, it proves to be advantageous if the spring element biases the actuating body in the circumferential direction.

In one embodiment of the invention, the spring element is supported on an axial shoulder, which in the space between the first functional part and the second functional part protrudes. In this case, the axial shoulder may be formed by the first functional part or the second functional part, or it may be connected as a separate component with the first functional part or the second functional part.

Finally, it proves to be advantageous if the axial shoulder is a part of the guide means. He can, for example, support the clamping body or the actuating body in the circumferential direction.

The clamping body may have an L-shaped area viewed in the axial direction. He can in this case support the actuator in the circumferential direction.

Furthermore, it proves to be advantageous if the adjusting body is arranged in the circumferential direction between the actuating element and a region of the clamping body.

Figur 1

eine explosionsartige, räumliche Darstellung einer Spannmutter mit Entlastungsvorrichtung des erfindungsgemäßen Handwerkzeuggeräts;

Figur 2

einen Querschnitt der Entlastungsvorrichtung in einer ersten Funktionsstellung;

Figur 3

einen Querschnitt der Entlastungsvorrichtung in einer zweiten Funktionsstellung.

Further features, details and advantages of the invention will become apparent from the appended claims and the drawings and the following description of preferred embodiments of the invention. In the drawing shows:

FIG. 1

an exploded, spatial representation of a clamping nut with relief device of the hand tool according to the invention;

FIG. 2

a cross-section of the relief device in a first functional position;

FIG. 3

a cross section of the discharge device in a second functional position.

The figures show a clamping nut 2 in which a relief device 4 is integrated. The clamping nut 2 can be screwed onto a not shown drive spindle of a hand tool, also not shown, and clamps a planar tool, such as a cutting disc, rotationally fixed relative to a tool flange of the drive spindle. The relief device 4 can be reduced in its axial extent 6 and has a first functional part 8 and a second functional part 10. Between the first functional part 8 and the second functional part 10 clamping body 12 and actuator 14 are arranged. As in the FIGS. 2 and 3 it can be seen, the respective adjusting body 14 sets its associated clamping body 12 against movement to the outside, in the radial direction 26, fixed. In addition, the relief device 4 has a trained as a collar 16 actuator 18. This supports the adjusting body 14 in a first functional position against movement in the radial direction 26.

The adjusting body 14 has a non-circular cross-section and is arranged in the relief device 4, that he, as in FIG. 2 shown, in the first functional position has a maximum radial extent 20 in the radial direction 26 and the clamping body 12 is supported radially outward. In this case, the adjusting body 14 abuts against the adjusting ring 16, both in the radial direction 26 and in the circumferential direction. When the adjusting ring 16 is rotated in the direction of actuation 22, the actuating body 14 is rotated about its axis of rotation 24 into a second functional position under the radial pressure of the clamping body 12. In this second functional position is the radial extent 20 of the actuating body 14 as in FIG. 3 shown reduced. The fact that the clamping body 12 can be displaced radially outward causes the two functional parts 8, 10 to move toward one another in the axial direction, so that their axial extent 6 is reduced and the clamping nut 2 can then be released.

FIG. 1 shows an exploded view of the individual components of the clamping nut 2 in which the relief device 4 is integrated. The first functional part 8 is in the assembled state with a flat side 28 on the tool. The first functional part 8 also has a circular opening 30, by means of which it can be pushed onto a dome-shaped elevation 31 of the second functional part 10, so that the first functional part 8 and the second functional part 10 are arranged concentrically to one another. The dom-shaped resignation 31 has an internally threaded portion 32 with which the clamping nut 2 can be screwed onto the drive spindle. First functional part 8 and second functional part 10 each have a truncated cone-like section 34, 35 on which the actuating bodies 14 abut with wedge-like oblique surfaces 36. In addition, axial shoulders 38 are fixedly arranged on the second functional part 10 on the second functional part 10. Against the paragraphs 38 spring elements 40 are based, which are arranged in the circumferential direction. Out FIG. 2 It can be seen that the spring elements 40 are supported on the one hand on the axial shoulders 38 and on the other hand on a radially inwardly directed projection 42 of the adjusting ring 16. The adjusting ring 16 surrounds the first functional part 8 and the second functional part 10 in the circumferential direction completely and supports, as in FIG. 2 can be seen, the actuating body 14 in the first functional position on the one hand by the projection 42 against rotation about the axis of rotation 24 and the other by its inner side against movement in the radial direction 26.

• Figur 2 zeigt die Entlastungsvorrichtung 4 in der ersten Funktionsstellung. In dieser ist die Spannmutter 2 mit dem Innengewindeabschnitt 32 des zweiten Funktionsteils 10 auf die Antriebsspindel so aufgeschraubt, dass sie das Werkzeug gegen den Werkzeugflansch der Antriebsspindel klemmt. Dabei ist das zweite Funktionsteil 10 axial in Richtung auf das erste Funktionsteil 8 gespannt. In der ersten Funktionsstellung stützt der Klemmkörper 12 die beiden Funktionsteile 8,10. Über den kegelstumpfartigen Abschnitt 34 des ersten Funktionsteils 8 und des zweiten Funktionsteils 10 werden die Druckkräfte, die durch das Klemmen des Werkzeugs entstehen, über die keilartigen Schrägflächen 36 des Klemmkörpers 12 in eine Kraftkomponente in radialer Richtung 26 aufgespalten, so dass der Klemmkörper 12 nach radial außen gedrückt wird. Gegen diese Bewegung wird der Klemmkörper 12 durch den anliegenden Stellkörper 14 und dieser durch den Stellring 16, der eine Bewegung des Stellkörpers 14 in radialer Richtung 26 verhindert, gestützt. Der jeweilige Klemmkörper 12 weist darüber hinaus in axialer Richtung betrachtet einen L-förmigen Abschnitt 44 auf, wobei er einerseits durch den axialen Absatz 38 und andererseits durch den Stellkörper 14 an einer Bewegung in Umfangsrichtung umfangsseitig gestützt wird. Damit sich der Stellkörper 14 in der ersten Funktionsstellung nicht ungewollt um die Drehachse 24 dreht, ist er in Umfangsrichtung auf der dem L-förmigen Abschnitt 44 des Klemmkörpers 12 gegenüberliegenden Seite durch den radialen Vorsprung 42 des Stellrings 16 gehalten und mittels des Federelements 40 in die erste Funktionsstellung vorgespannt.
• Figur 3 zeigt die Entlastungsvorrichtung 4, bei der der Stellring 16 in Betätigungsrichtung 22 manuell gedreht ist. Durch das Verdrehen des Stellrings 16 wird das Federelement 40 durch den radialen Vorsprung 42 komprimiert, dadurch wird dem Stellkörper 14 Raum gegeben, so dass er um seine Achse 24 in die zweite Funktionsstellung gedreht werden kann, und zwar durch den nach radial außen belasteten Klemmköper 12. Der Klemmkörper 12 wandert dabei in radialer Richtung 26 nach außen. Er gleitet dabei mit seiner keilartigen Schrägfläche 36 an den kegelstumpfartigen Abschnitten 34 des ersten Funktionsteils 8 und des zweiten Funktionsteils 10 nach außen, so dass die axiale Erstreckung der Entlastungsvorrichtung 4 reduziert wird. Ein widerstandsarmes manuelles Abschrauben der Spannmutter 2 von der Antriebsspindel ist nunmehr möglich.

Based on FIGS. 2 and 3 the interaction of the individual components in the two functional positions is explained:

• FIG. 2 shows the relief device 4 in the first functional position. In this, the clamping nut 2 is screwed to the internal threaded portion 32 of the second functional part 10 on the drive spindle so that it clamps the tool against the tool flange of the drive spindle. In this case, the second functional part 10 is stretched axially in the direction of the first functional part 8. In the first functional position, the clamping body 12 supports the two functional parts 8,10. About the frustoconical portion 34 of the first functional part 8 and the second functional part 10, the compressive forces arising from the clamping of the tool, split over the wedge-like inclined surfaces 36 of the clamp body 12 in a force component in the radial direction 26, so that the clamping body 12 radially is pressed outside. Against this movement, the clamping body 12 is supported by the adjacent actuating body 14 and this by the adjusting ring 16, which prevents movement of the actuating body 14 in the radial direction 26. The respective clamping body 12 also has, viewed in the axial direction, an L-shaped section 44, wherein it is supported on the one hand by the axial shoulder 38 and on the other hand by the adjusting body 14 on a circumferential movement in the circumferential direction. So that the adjusting body 14 does not unintentionally rotate around the rotation axis 24 in the first functional position, it is in the circumferential direction on the side opposite the L-shaped portion 44 of the clamping body 12 by the radial projection 42 held the adjusting ring 16 and biased by the spring element 40 in the first functional position.
• FIG. 3 shows the relief device 4, in which the adjusting ring 16 is rotated manually in the direction of actuation 22. By rotating the adjusting ring 16, the spring element 40 is compressed by the radial projection 42, thereby the adjusting body 14 given space so that it can be rotated about its axis 24 in the second functional position, by the radially outwardly loaded clamping body 12th The clamping body 12 migrates in the radial direction 26 to the outside. It slides with its wedge-shaped inclined surface 36 at the truncated cone-like portions 34 of the first functional part 8 and the second functional part 10 to the outside, so that the axial extent of the discharge device 4 is reduced. A low-resistance manual unscrewing of the clamping nut 2 of the drive spindle is now possible.

After loosening the clamping nut 2, ie after completion of the manual operation, the adjusting ring 16 and the adjusting body 14 and the clamping body 12 is returned by the spring element 40 in the first functional position.

Claims (15)

1. A hand tool device with a tool flange for drive spindles having a rotatably drivable planar tool, with a clamping nut (2) which can be screwed onto the free end of the drive spindle and clamps the tool against the tool flange in torsionresistant manner, and with a relief device (4) which is arranged on that side of the tool which is remote from the tool flange and has an actuating element (18) and whereof the axial extent (6) can be reduced to release the clamping nut (2), wherein the relief device (4) has a first functional part (8) and a second functional part (10) between which a clamping body (12), having a wedge-like sloping face (36), and a control body (14) is arranged, wherein the control body (14) fixes the clamping body (12) against moving radially outwards so that the clamping body (12) supports the first functional part (8) and the second functional part (10) in the axial direction,
   characterised in that the control body (14) has a non-circular, particularly oval or elliptical cross-section, and in that, in a first functional position, it has a maximum radial extent (20) and can be rotated by means of the actuating element (18) about an axis of rotation (24) into a second functional position in which its radial extent (20) is reduced so that the clamping body (12) can be moved radially outwards and a reduction in the axial extent (6) of the relief device (4) can thus be achieved.
2. A hand tool device according to Claim 1, characterised in that the relief device (4) and the clamping nut (2) are constructed as a pre-mountable assembly and the relief device (4) is integrated in the clamping nut (2).
3. A hand tool device according to one of the preceding claims, characterised in that the first functional part (8) and/or the second functional part (10) has a frustoconical portion (34) so that the clamping body (12) is pressed radially outwards by the first functional part (8) and/or by the second functional part (10).
4. A hand tool device according to one of the preceding claims, characterised in that a guide means is provided, which guides the clamping body (12) in the radial direction (26).
5. A hand tool device according to one of the preceding claims, characterised in that the actuating element (18) supports the control body (14) radially externally in its first functional position and acts on the control body (14) in the circumferential direction.
6. A hand tool device according to one of the preceding claims, characterised in that the axis of rotation (24) of the control body (14) extends parallel to the axis of the drive spindle.
7. A hand tool device according to one of the preceding claims, characterised in that the actuating element (18) can be actuated in the circumferential direction.
8. A hand tool device according to one of the preceding claims, characterised in that the actuating element (18) surrounds the first functional part (8) and the second functional part (10) externally in the circumferential direction.
9. A hand tool device according to one of the preceding claims, characterised in that a spring element (40) is provided, which pre-tensions the control body (14) in the first functional position and the spring element (40) is arranged axially in the clearance between the first functional part (8) and the second functional part (10).
10. A hand tool device according to Claim 9, characterised in that the spring element (40) pre-tensions the control body (14) in the circumferential direction.
11. A hand tool device according to one of Claims 9 or 10, characterised in the spring element (40) is supported on an axial projection (38) which projects into the space between the first functional part (8) and the second functional part (10).
12. A hand tool device according to Claim 11, characterised in that the axial projection (38) is connected to the first functional part (8) or to the second functional part (10).
13. A hand tool device according to one of the preceding claims, characterised in that an axial projection (38) is provided, which projects into the space between the first functional part (8) and the second functional part (10) and is part of the guide means radially guiding the clamping body (12).
14. A hand tool device according to one of the preceding claims, characterised in that, as seen in the axial direction, the clamping body (12) has an L-shaped region in which the control body (14) is provided.
15. A hand tool device according to one of the preceding claims, characterised in that the control body (14) is arranged in the circumferential direction between the actuating element (18) and a region of the clamping body (12) and, in particular, is in direct contact therewith.

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