Adapter Device for a Power Tool, Power Tool and Tool System

Abstract

The disclosure relates to an adapter device for a power tool, in particular a multifunctional power tool that is able to be driven in an oscillating manner, having at least one machine interface for connecting to the power tool, in particular to a tool receptacle of the power tool, and having at least one tool interface for connecting to a sanding tool, in particular to a sanding sheet. It is proposed that the machine interface have a connecting plane which encloses an angle other than 0°, 90° and 180° with a connecting plane of the tool interface.

Claims

1. An adapter device for a multifunction power tool configured to be driven in oscillation, comprising: at least one machine interface configured to connect to a tool receiver of the multifunction power tool; and at least one tool interface configured to connect to an abrasive sheet, wherein the at least one machine interface has a connection plane that, with a connection plane of the at least one tool interface, encloses an angle that is other than 0°, 90° and 180°.

2. The adapter device as claimed in claim 1, further comprising: at least one rotary bearing unit or a linear bearing unit, designed to support the at least one machine interface so that the at least one machine interface is pivotable, with respect to the at least one tool interface about an axis of inclination of the at least one machine interface.

3. The adapter device as claimed in claim 1, further comprising: at least one linear bearing unit, which has at least one linear bearing element on which the at least one tool interface is supported in a displaceable manner.

4. The adapter device as claimed in claim 1, further comprising: at least one linear bearing unit, which has at least one linear bearing element on which the at least one machine interface is supported in a displaceable manner.

5. The adapter device as claimed in claim 2, further comprising: at least one fixing unit, which has at least one fixing element that is designed to fix the at least one tool interface relative to the at least one machine interface in at least one angular position.

6. The adapter device as claimed in claim 1, further comprising: at least one base element on which the at least one tool interface and the at least one machine interface are arranged, and which is realized at least substantially in a wedge shape.

7. The adapter device as claimed in claim 1, further comprising: at least one air channel configured to pass chips, the at least one air channel extending from the at least one tool interface to the at least one machine interface and is realized curved by the angle in at least one operating state

8. The adapter device as claimed in claim 1, wherein the at least one machine interface is realized as part of a ball joint.

9. A tool system comprising at least one multifunctional power tool configured to be driven in oscillation, and comprising an adapter device as claimed in claim 1.

10. A multifunction power tool configured to be driven in oscillation, comprising: at least one drive unit which has a drive axis; at least one output unit which has an output axis; and at least one tool interface, wherein: the drive axis is transverse to the output axis; and the at least one tool interface has a connection plane that in relation to the drive axis and/or to the output axis encloses at least one angle that is other than 0°, 90° and 180°.

Description

DRAWING

[0023] Further advantages are given by the following description of the drawing. Five exemplary embodiments of the invention are represented in the drawing. The drawing, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to create appropriate further combinations.

[0024] In the drawing:

[0025] FIG. 1 shows a tool system according to the invention comprising an adapter device according to the invention, in a schematic representation,

[0026] FIG. 2 shows the adapter device according to the invention, in a schematic representation,

[0027] FIG. 3 shows an alternative adapter device according to the invention, in a schematic representation,

[0028] FIG. 4 shows an alternative adapter device according to the invention, in a schematic representation,

[0029] FIG. 5 shows an alternative adapter device according to the invention, in a schematic representation, and

[0030] FIG. 6 shows a power tool according to the invention, in a schematic representation.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0031] FIG. 1 shows a tool system 50a comprising at least one power tool 20a and comprising at least one adapter device 10a. The power tool 20a is in particular constituted by a multifunction power tool that can be driven in oscillation. The adapter device 10a is designed for the power tool 20a, in particular the multifunction power tool that can be driven in oscillation.

[0032] FIG. 2 shows a detailed view of the adapter device 10a when having been removed from the power tool 20a. The adapter device 10a has a machine interface 12a. The adapter device 10a has a tool interface 14a. The adapter device 10a has at least one base element 16a. The machine interface 12a is arranged on the base element 16a. The tool interface 14a, in particular of the adapter device 10a, is arranged on the base element 16a. The tool interface 14a, in particular of the adapter device 10a, and the machine interface 12a are arranged on the base element 16a. The base element 16a is realized in a wedge shape. The base element 16a has a pointed end, in particular pointed end 38a. The base element 16a has a blunt end, in particular blunt end 40a. The base element 16a, in a cross-section perpendicular to a connection plane 42a of the machine interface 12a of the base element 16a, in particular along a connecting line from the pointed end 38a to the blunt end 40a of the base element 16a, has an outer contour which is composed of a triangle and/or a rectangle. The base element 16a may be realized as a metal wedge.

[0033] The tool interface 14a, in particular of the adapter device 10a, is designed for connection to an abrasion tool 52a, in particular an abrasive sheet 56a, and/or to a saw tool, in particular a saw blade. The abrasion tool 52a and/or saw tool comprise/comprises in particular a clamping element 54a, on which the abrasive sheet 56a and/or the saw blade are/is arranged. The machine interface 12a is designed for connection to the power tool 20a, in particular to a tool receiver 44a of the power tool 20a. The machine interface 12a is firmly connected to the power tool 20a, in particular to the tool receiver 44a. The machine interface 12a is arranged at a distance from the tool interface 14a, in particular of the adapter device 10a. A distance 64a of the machine interface 12a from the tool interface 14a, in particular of the adapter device 10a, is realized so as to increase from the pointed end 38a of the base element 16a towards the blunt end 40a of the base element 16a. The tool interface 14a, in particular of the adapter device 10a, is firmly connected to the abrasion tool 52a, in particular the clamping element 54a, and/or the saw tool. The clamping element 54a may in particular be realized as a flat plastic element, that in particular is of a size corresponding to the size of an abrasive sheet. It is conceivable for the clamping element 54a to realize a clamping angle, in particular between 0° and 90°, between the main extent of the abrasive sheet 56a and/or of the saw blade and a connection plane 42a′. It is conceivable for the clamping element 54a to be of a multipart design.

[0034] The machine interface 12a has the connection plane 42a. The tool interface 14a, in particular of the adapter device 10a, has a connection plane 42a′. The connection plane 42a, in particular of the machine interface 12a, encloses an angle 18a with the connection plane 42a′ of the tool interface 14a, in particular of the adapter device 10a. The angle 18a is other than 0°, 90° and 180°. The angle 18a, in particular between the connection plane 42a of the machine interface 12a and the connection plane 42a′ of the tool interface 14a, in particular of the adapter device 10a, is realized so as to be invariable. In FIG. 1 and FIG. 2, for example, the angle 18a is approximately 17.5°.

[0035] The adapter device 10a has at least one air channel 22a for passing particles, in particular chips. The air channel 22a extends from the tool interface 14a, in particular of the adapter device 10a, to the machine interface 12a. The air channel 22a is curved by the angle 18a in at least one operating state. In particular, the openings, in particular opening planes, of the air channel 22a at the machine interface 12a and the tool interface 14a, in particular of the adapter device 10a, are tilted relative to each other by the angle 18a.

[0036] The adapter device 10a has a bearing unit 24a, in particular linear bearing unit 28a. The linear bearing unit 28a has at least one linear bearing element 30a. The machine interface 12a is supported on the linear bearing element 30a in a movable, in particular displaceable, manner. The machine interface 12a is realized so as to be linearly displaceable, in particular along its connection plane 42a, with respect to the base element 16a. It is also conceivable, however, for the adapter device 10a to be realized without the bearing unit 24a, and for the machine interface 12 to be arranged in a fixed angular position relative to the tool interface 14a.

[0037] The linear bearing unit 28a has at least one further linear bearing element 30a′. The tool interface 14a, in particular of the adapter device 10a, is supported on the linear bearing element 30a′ in a movable, in particular displaceable, manner. The tool interface 14a, in particular of the adapter device 10a, is realized so as to be linearly displaceable, in particular along its connection plane 42a′, with respect to the base element 16a. The linear bearing elements 30a, 30a′ may be realized, for example, as guide rails. The linear bearing elements 30a, 30a′ are realized as a linear guide, in particular as a guide rail. It is conceivable for the linear bearing elements 30a, 30a′ to be realized as linear guides, each having at least one element guided in a groove, such as, for example, a dovetail.

[0038] The adapter device 10a has a fixing unit 32a that comprises two fixing elements 34a, 34a′. The fixing elements 34a, 34a′ are realized, for example, as latching elements or setscrews. The fixing elements 34a, 34a′ are designed to prevent linear displacement of the tool interface 14a, in particular of the adapter device 10a, and of the machine interface 12a and to fix the tool interface 14a, in particular of the adapter device 10a, and the machine interface 12a in a defined position.

[0039] It is conceivable that arranged on the adapter device 10a there is at least one air channel interface that is designed for coupling to, in particular guiding, a flexible air channel 22a, that in particular is connected to an external air suction extraction device, in particular a vacuum cleaner.

[0040] It is conceivable for the adapter device 10a, in particular the base element 16a, to be firmly connected to the abrasion tool 52a and/or to the saw tool. It is conceivable for the adapter device 10a, in particular the base element 16a, to be realized as a single piece or as a single part with the abrasion tool 52a and/or the saw tool.

[0041] FIGS. 3 to 6 show a further exemplary embodiments of the invention. The following descriptions and the drawings are limited substantially to the differences between the exemplary embodiments and, in principle, reference may also be made to the drawings and/or the description of the other exemplary embodiment, in particular of FIGS. 1 to 2, in respect of components having the same designation, in particular in respect of components denoted by the same references. To distinguish the exemplary embodiments, the letter a has been appended to the references of the exemplary embodiment in FIGS. 1 to 2. In the exemplary embodiments of FIGS. 3 to 6, the letter a is replaced by the letters b to d.

[0042] FIG. 3 shows an alternative embodiment of the adapter device 10b. The adapter device 10b comprises a base element 16b. The tool interface 14b is connected to an abrasion tool 52b that comprises a clamping element 54b and an abrasive sheet 56b, and/or to a saw tool that comprises at least one saw blade. The base element 16b is arranged between the machine interface 12b and the tool interface 14b. The base element 16b has an extent, from a pointed end 38b to a blunt end 40b, that is shorter than a maximum parallel extent of the tool interface 14b, in particular machine interface 12b. The base element 16b has a base surface 48b that faces away from the tool interface 14b.

[0043] The adapter device 10b comprises at least one bearing unit 24b, in particular rotary bearing unit 26b. The bearing unit 24b, in particular rotary bearing unit 26b, is designed to support the machine interface 12b so that it is movable, in particular pivotable, with respect to the tool interface 14b, in particular about an axis of inclination of the machine interface 12b. The rotary bearing unit 26b has a rotary bearing element 60b. The rotary bearing element 60b is arranged in a common end region of the machine interface 12b and of the tool interface 14b, in particular the connection plane 42b of the machine interface 12b and the connection plane 42b′ of the tool interface 14b. The rotary bearing element 60b is connected to the tool interface 14b and the machine interface 12b in a common end region, in particular an outer end of an extent of the connection plane 42b, 42b′ of the respective interface, the machine interface 12b and the tool interface 14b.

[0044] The base element 16b is supported so as to be displaceable along the machine interface 12b. The base element 16b is supported so as to be displaceable from the blunt end 40b in the direction of the pointed end 38b, in particular in the direction of the rotary bearing element 60b of the rotary bearing unit 26b, in order to achieve a defined angle 18b between the connection plane 42b of the machine interface 12b and the connection plane 42b′ of the tool interface 14b. The rotary bearing unit 26b, in particular the rotary bearing element 60b, is realized, for example, as a hinge or pin, bolt, rivet and/or rivet with a rotary bearing support.

[0045] The adapter device 10b is designed for setting the angle 18b, in particular between the connection plane 42b of the machine interface 12b and the connection plane 42b′ of the tool interface 14b. In particular, the rotary bearing unit 26b supports the machine interface 12b so that it is movable, in particular pivotable, with respect to the tool interface 14b.

[0046] The adapter device 10b comprises at least one bearing unit 24b′, in particular a linear bearing unit 28b. The linear bearing unit 28b has at least one linear bearing element 30b. The base element 16b is supported on the linear bearing element 30b so as to be movable, in particular displaceable, in particular with respect to the tool interface 14b. It is conceivable for the bearing unit 24b to be realized as a rotary bearing unit 26b and as a linear bearing unit 28b, in particular for the bearing unit 24b to comprise the bearing unit 24b′. The angle 18b between the connection plane 42b′ of the tool interface 14b and the connection plane 42b of the machine interface 12b is settable. The angle 18b between the connection plane 42b′ of the tool interface 14b and the connection plane 42b of the machine interface 12b is settable, in particular between 0.1° and 45°, by a linear displacement of the base element 16b with respect to the tool interface 14b.

[0047] The machine interface 12b has a contact region 46b with the base element 16b. The contact region 46b shifts over the entire base surface 48b as the base element 16b is displaced. The machine interface 12b and the base element 16b are movably connected to each other, in particular in order to increase a stability of the adapter device 10b. In the exemplary embodiment shown, the contact region 46b is realized guided along a guide, in particular a linear guide 58b such as, for example, a groove. It is conceivable for a guide element of the guide to be arranged on and/or to the side of the base surface 48b, the guide element being connected to the machine interface 12b and guiding it along a defined, in particular curved, path as the base element 16b is displaced. The conceivable guide element may be realized, for example, as one or more guide rail(s).

[0048] The adapter device 10b has at least one fixing unit 32b. The fixing unit 32b has at least one fixing element 34b that is designed to fix the tool interface 14b relative to the machine interface 12b in at least one angular position. The fixing element 34b is designed to fix the base element 16b with respect to the tool interface 14b, in particular to fix the machine interface 12b in relation to the tool interface 14b in a defined angular position.

[0049] The fixing element 34b may be realized, for example, as a setscrew or latching element. The fixing element 34b is designed for setting the angle 18b. For example, the angle 18b may be set to within tenths of a degree by means of a setscrew as the fixing element 34b.

[0050] A defined angle 18b between the connection plane 42b of the machine interface 12b and the connection plane 42b′ of the tool interface 14b can be achieved, in particular set, by a linear displacement of the base element 16b and fixing of the base element 16b.

[0051] It is conceivable for the contact region 46b to be unguided. It is conceivable for a fixing element 34b, designed to fix the adapter device 10b in a defined angular position to be arranged on the rotary bearing unit 26b. It is conceivable for a fixing element 34b, which fixes the rotary bearing unit 26b in an angular position with respect to the gravitational force of the adapter device 10c, in particular of the abrasion tool 52b and/or saw tool, of the machine interface 12c and of the base element 16b, and/or reversibly blocks further rotation at the rotary bearing unit 26b, to be arranged on the rotary bearing unit 26b

[0052] It is conceivable for the bearing unit 24b, in particular the linear bearing unit 28b and/or the rotary bearing unit 26b, and/or the fixing unit 32b to have at least one protective housing that is designed to protect a setting capability of the angle 18b, in particular a mobility, in particular against flying particles.

[0053] FIG. 4 shows an alternative embodiment of the adapter device 10c. The adapter device 10c is realized without an element that is analogous to the base element 16b of FIGS. 1 to 3. The tool interface 14c is connected to an abrasion tool 52c comprising a clamping element 54c and an abrasive sheet 56c, and/or to a saw tool comprising at least one saw blade. The machine interface 12c is connected to the tool receiver 44c of the power tool 20c.

[0054] The adapter device 10c comprises at least one bearing unit 24c, in particular rotary bearing unit 26c. The bearing unit 24c, in particular rotary bearing unit 26c, is designed to support the machine interface 12c so that it is movable, in particular pivotable, with respect to the tool interface 14c, in particular about an axis of inclination of the machine interface 12c. The rotary bearing unit 26c has a rotary bearing element 60c. The rotary bearing element 60c is arranged in a common end region of the machine interface 12c and of the tool interface 14c, in particular the connection plane 42c of the machine interface 12c and the connection plane 42c′ of the tool interface 14c. The rotary bearing element 60c is connected to the tool interface 14c and the machine interface 12c in a common end region, in particular an outer end of an extent of the connection plane 42c, 42c′ of the machine interface 12c and/or of the tool interface 14c. The rotary bearing unit 26c, in particular the rotary bearing element 60c, is realized, for example, as a hinge or pin, bolt, rivet or rivets with a rotary bearing support. The adapter device 10c comprises a fixing unit 32c. The fixing unit 32c is arranged between the machine interface 12c and the tool interface 14c, in particular in an end region of the tool interface 14c and/or machine interface 12c opposite the rotary bearing element 60c. It is conceivable for the rotary bearing element 60c to be at least partially realized as a hinge. It is conceivable for the rotary bearing element 60c to be realized as a rod-like element through which the machine interface 12c and the tool interface 14c are supported in a movable manner.

[0055] The adapter device 10c, in particular the fixing unit 32c and/or the rotary bearing unit 26c, are/is designed for adjusting and/or fixing the angle 18c, in particular between the connection plane 42c of the machine interface 12c and the connection plane 42c′ of the tool interface 14c. In particular, by means of the rotary bearing unit 26c, the machine interface 12c is supported so that it is movable, in particular pivotable, with respect to the tool interface 14c. In particular, by means of the fixing unit 32c, the machine interface 12c, in particular the connection plane 42c of the machine interface 12c, can be fixed in an angular position with respect to the tool interface 14c, in particular the connection plane 42c′ of the tool interface 14c.

[0056] The fixing unit 32c comprises three fixing strips 66c, 66c′, 66c″. The fuser unit 32c comprises four pivot elements 62c, 62c′, 62c″, 62c′″. The fixing strips 66c, 66c′ are pivotally connected to each other at one end, in particular a middle end, of their main extents. The fixing strips 66c, 66c′ are pivotably connected to each other via a pivot element 62c′. The fixing strips 66c, 66c′ can in particular be pivoted past each other via the pivoting element 62c′. The swivel elements 62c, 62c′, 62c″, 62c′″ may be realized as hinges or the like.

[0057] The fixing strip 66c is pivotably connected to the machine interface 12c at a further end, in particular a further end opposite the middle end, of its main extent. The fixing strip 66c is connected to the machine interface 12c, in particular pivotably, via the pivot element 62c. The fixing strip 66c is connected to the machine interface 12c in an end region of the machine interface 12c that opposite the rotary bearing element 60c. The middle ends of the fixing strips 66c, 66c′ are the ends of the main extent of the fixing strips 66c, 66c′ that are realized spaced apart from, in particular unconnected to, the tool interface 14c or the machine interface 12c.

[0058] The fixing strip 66c′ is pivotably connected to the tool interface 14c at a further end, in particular a further end opposite the middle end, of its main extent. The fixing strip 66c′ is connected to the tool interface 14c, in particular pivotably, via the pivot element 62c″. The fixing strip 66c′ is connected to the tool interface 14c in an end region of the tool interface 14c that opposite the rotary bearing element 60c.

[0059] The fixing strip 66c is, in particular in addition to the pivotable connection at the middle ends, connected to the fixing strip 66c′ via the fixing strip 66c″. The fixing strip 66c″ is pivotably supported on/connected to one of the fixing strips 66c, 66c′, in particular the fixing strip 66c, that is connected to the machine interface 12c, in particular at a distance from the middle end of the fixing strip 66c.

[0060] The fixing strip 66c″ is slidably supported on/connected to one of the fixing strips 66c, 66c′, in particular the fixing strip 66c′, that is connected to the tool interface 14c, in particular spaced from the middle end of the fixing strip 66c′.

[0061] The fixing unit 32c comprises a fixing element 34c. The fixing element 34c is realized as a linear fixing element 84c. The fixing element 34c is arranged on the fixing strip 66c′ in a linearly displaceable manner. The fixing element 34c is realized, for example, as a latching element. The fixing element 34c may, for example, latch into the fixing strip 66c″ in various positions that can be achieved by displacement, in particular linear displacement, on the fixing strip 66c′. The fixing strip 66c″ may be realized, for example, as a groove for guiding the latching element. The fixing strip 66c may have latching recesses for latching the fixing element 34c.

[0062] An air channel 22c is arranged between the machine interface 12c and the tool interface 14c. The air channel 22c is made, for example, from an elastomer, in particular as a bellows. In any operating state, the air channel 22c can realize the angle 18c at which the connection planes 42c, 42c′ are located relative to each other. The air channel 22c has two openings. In particular, the openings of the air channel 22c are at the angle 18c with respect to each other in any angular position of the machine interface 12c and of the tool interface 14c, in particular of the adapter device 10c. In particular, the openings of the air channel 22c are arranged on the connection planes 42c, 42c′ of the tool interface 14c and of the machine interface 12c. Between the openings, the air channel 22c may in particular be at least substantially straight.

[0063] FIG. 5 shows an alternative embodiment of the adapter device 10d. In the example shown, the tool interface 14d is realized as a single piece, in particular as a single part, with the abrasion tool 52d, in particular the clamping element 54d, and/or the saw tool. It is conceivable for the clamping element 54d to be realized separately from the tool interface 14d, and to be connected to the tool interface 14d, in particular in a manner similar to the previous exemplary embodiments.

[0064] The tool interface 14d is firmly connected, in particular realized as a single piece or as a single part, with a ball element 68d of a ball joint 36d. The machine interface 12d is realized as part of a ball joint 36d. The machine interface 12d has a recess 70d for receiving the ball element 68d. The recess 70d is minimally larger than the ball element 68d. The machine interface 12d is movably supported on the tool interface 14d via the ball joint 36d. In particular, an angle 18d between the connection plane 42d of the machine interface 12d and the connection plane 42d′ of the tool interface 14d can be set via the ball joint 36d.

[0065] A fixing element 34d of a fixing unit 32d is arranged on the ball joint 36d. It is conceivable for the fixing unit 32d to comprise a plurality of fixing elements 34d. For example, the fixing element 34d is realized as a clamping screw that reduces the effective inner radius of the recess 70d in such a way that the ball element 68d is clamped in the recess 70d. The angle 18d is realized so as to be fixable by the fixing element 34d.

[0066] It is conceivable for the fixing element 34d to be able to hold the ball joint 36d together in a position in which the angle 18d is unfixed. It is conceivable for the machine interface 12d to be arranged as a ball joint 36d on a, in particular wedge-shaped, element that in particular is realized in a manner similar to the base element 16a of the first exemplary embodiment as in FIGS. 1 and 2. It is conceivable for the ball joint 36d to be arranged the other way round, in particular to be firmly connected, in particular realized as a single piece or single part, with the machine interface 12d, and in particular for the tool interface 14d to have the recess 70d for receiving the ball element 68d.

[0067] FIG. 6 shows a power tool 20e, in particular a multifunctional power tool that can be driven in oscillation. The power tool 20e is realized without an element, in particular an adapter device 10a, 10b, 10c, 10d as in FIGS. 1 to 5, for achieving an angle 18d. The power tool 20e has at least one drive unit 72e. The drive unit 72e is realized as an electric motor. The drive unit 72e has a drive axis 74e. The power tool 20e has at least one output unit 76e. The output unit 76e is realized as an oscillatory transmission, in particular for converting a rotary motion into an oscillatory motion. The output unit 76e has an output axis 78e. The output axis 78e is designed to transmit an oscillatory motion to an abrasion tool 52e and/or saw tool. The drive axis 74e is transverse to the output axis 78e.

[0068] The power tool 20e has at least one tool interface 14e. The power tool 20e has at least one machine interface 12e. The machine interface 12e has a connection plane 42e. The connection plane 42e encloses in relation to the drive axis 74e at least one angle 18e that is other than 0°, 90° and 180°. The connection plane 42e encloses in relation to the output axis 78e at least one angle 80e that is other than 0°, 90° and 180°. The connection plane 42e encloses in relation to the input axis 74e at least one angle 18e that is other than 0°, 90° and 180°. The connection plane 42e encloses in relation to the output axis 78e at least one angle 80e that is other than 0°, 90° and 180°.

[0069] The tool interface 14e has a connection plane 42e′. The connection plane 42e′ encloses in relation to the drive axis 74e at least one angle 18e that is other than 0°, 90° and 180°. The connection plane 42e′ encloses in relation to the output axis 78e at least one angle 80e that is other 0°, 90° and 180°. The connection plane 42e′ encloses in relation to the input axis 74e at least one angle 18e that is other than 0°, 90° and 180°. The connection plane 42e′ encloses in relation to the output axis 78e at least one angle 80e that is other than 0°, 90° and 180°.

[0070] The output axis 78e may be perpendicular to the input axis 74e. The output axis 78e, in particular for the purpose of transmitting force, in particular efficiently, extends at an angle 82e of between 30° and 90°, such as 45°, 60° or 75°, in relation to the input axis 74e. It is conceivable for the connection plane 42e′ of the tool interface 14e or the connection plane 42e of the machine interface 12e to enclose with the drive axis 74e an angle 18e that is either 15°, 20°, 25°, 30° or 35°. In the exemplary embodiment shown, the angle 18e is realized as 17.5°.