WO2013000662A1

WO2013000662A1 - Handheld power tool with an excitation actuator that is capable of vibrating

Info

Publication number: WO2013000662A1
Application number: PCT/EP2012/060401
Authority: WO
Inventors: Juergen Luginsland; Michael-Andreas Grunwald; Dietmar Saur
Original assignee: Robert Bosch Gmbh
Priority date: 2011-06-27
Filing date: 2012-06-01
Publication date: 2013-01-03
Also published as: DE102011078083A1

Abstract

The invention relates to a handheld power tool (100) with a drive unit (170) for driving an insert tool (130) in a vibrating manner. The drive unit (170) is mounted on a corresponding tool housing (110) so as to be able to vibrate and has at least one excitation actuator (180) which is capable of vibrating, which has at least one excitation element (182, 184) made of a piezoelectric material, and which is coupled to a coupling element (172) in order to transmit vibrations onto the insert tool (130), said vibrations being generated by the excitation actuator (180) during the operation of the drive unit (170). An electronic component (120) is provided for controlling the drive unit (170). According to the invention, the tool housing (110) has at least one first housing portion (192) with a first corresponding longitudinal axis (198) and a second housing portion (194) with a second corresponding longitudinal axis (197), said first longitudinal axis (198) being arranged at a first specified angle (199) relative to the second longitudinal axis (197).

Description

description

title

Hand-held power tool with a vibratory excitation actuator prior art

The present invention relates to a hand-held power tool having a drive unit for oscillating drive of an insert tool, wherein the drive unit is mounted oscillatably on an associated tool housing and at least one oscillatory excitation actuator having at least one excitation element formed of a piezoelectric material and with a coupling element for the transmission of Vibrations is coupled to the insert tool, which are generated by the excitation actuator during operation of the drive unit, wherein an electronic component for controlling the drive unit is provided.

Such hand-held power tools with drive units are known from the prior art, the z. B. can be designed as cutters with cutting tools for cutting different materials. In these cutters, the cutting tools z. These excitation actuators have one or more disc-shaped piezoceramics, each of which has a piezoelectric element and an associated pressure plate of one or more piezoelectric elements The drive unit is electrically conductively connected to a battery pack, for example for mains-independent power supply, to control the drive unit, an electronic component electrically connected to the battery pack is provided with at least a part of the battery pack and the drive unit is arranged in an associated tool housing. A disadvantage of the prior art is that the tool housing such cutters are often of limited ergonomic design. Depending on a given work environment, this can lead to comparatively complicated and cumbersome handling and thus to

Loss of comfort for a user of the cutter lead.

DISCLOSURE OF THE INVENTION It is therefore an object of the invention to provide a new hand-held power tool with a drive unit provided with at least one oscillatable excitation actuator, which has a comparatively ergonomic design and enables improved handling in different working environments.

This problem is solved by a hand-held power tool with a drive unit for oscillating drive an insert tool. The drive unit is oscillatably mounted on an associated tool housing and has at least one oscillatory excitation actuator, which has at least one excitation element formed of a piezoelectric material and is coupled to a coupling element for transmitting vibrations to the insertion tool, which in operation of the drive unit

Excitation actuator can be generated. An electronic component is provided for controlling the drive unit. The tool housing has at least one first housing section with a first associated longitudinal axis and a second housing section with a second associated longitudinal axis. The first longitudinal axis is arranged at a first predetermined angle to the second longitudinal axis. The invention thus makes it possible to provide a hand-held electric tool with a drive unit provided with at least one oscillatable excitation actuator, which has an at least partially angled and accordingly comparatively ergonomically designed tool housing and thus enables an overall improved handling. Preferably, a battery pack for mains-independent power supply of the drive unit is provided, which is electrically connected to the electronic component.

Thus, a network-independent power supply of the hand-held power tool can be made possible in a simple manner.

The drive unit is preferably at least partially in the first

Housing section arranged. The battery pack is preferably arranged at least in sections in the second housing section.

Thus, a simple and straightforward division and assignment of the components of the power tool in or to different housing sections are made possible.

According to one embodiment, the electronic component is arranged at least in sections in the first housing section.

The invention thus makes it possible to provide a power tool with a comparatively short gripping area, which is formed by the first housing section and bounded by a comparatively short holding area formed by the second housing section, the gripping area allowing uncomplicated gripping of the power tool and the holding area prevent slippage from the grip area during operation of the power tool safe and reliable.

According to one embodiment, the electronic component is arranged at least in sections in the second housing section.

The invention thus makes it possible to provide a power tool with a comparatively long gripping area, that of the second

Housing portion is formed and a comfortable gripping of the power tool allows, with the angled first housing portion also allows easy work in angled and tight working environments. According to one embodiment, the tool housing has at least one third housing section with a third associated longitudinal axis, wherein the third longitudinal axis is arranged at a second predetermined angle to the second longitudinal axis.

The invention thus makes it possible to provide a handle region bounded on both sides, which is formed by the second housing section and safely and reliably protects the hand of a user from slipping off the handle region during operation of the power tool by the angled first and second housing sections.

The electronic component is preferably arranged at least in sections in the second housing section and the battery pack is preferably arranged at least in sections in the third housing section.

Thus, the provision of a power tool can be made possible in which a simple and straightforward division and assignment of the components of the power tool in or to different housing sections.

According to one embodiment, the first and second predetermined angles are predetermined such that the tool housing is at least approximately arcuate.

The invention thus enables the provision of a simple to handle, robust power tool.

According to one embodiment, the first and second predetermined angles are predetermined such that the tool housing is at least approximately S-shaped.

The invention thus makes it possible to provide a power tool with an ergonomic grip area, which offers different grip positions.

The electronic component is preferably arranged in the tool housing in the region between the drive unit and the battery pack. Thus, a stable power tool having a compact structure can be provided.

Brief description of the drawings

The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:

1 is a partially sectioned side view of a hand-held electric tool with a tool housing according to a first embodiment,

2 shows a partially sectioned side view of a hand-held power tool with a tool housing according to a second embodiment,

3 is a partially sectioned side view of a hand-held electric tool with a tool housing according to a third embodiment, and

4 shows a partially sectioned side view of a hand-held electric tool with a tool housing according to a fourth embodiment.

Description of the embodiments

1 shows a trained by way of example of a cutting device, handge led power tool 100 having a formed like a cutting blade insert tool 130 and a cut tool housing 1 10 shown according to a first embodiment. This illustratively forms an inner space 15, in which at least sections a drive unit 170 provided for oscillating drive of the cutting blade 130 is arranged, which has at least one oscillatory excitation actuator 180. In addition, a contact element 143, at least one electronic component 120 and, at least in sections, an operating button are arranged in the inner space 15. This is masked by the electronic component 120 in FIG. 1 by way of example, but can be concealed at any other position of the work piece. be arranged convincing housing, z. B. above the electronics component 120, etc.

According to one embodiment, the cutting device 100 for mains-independent power supply is mechanically and electrically connectable to a battery pack 140. It should be understood, however, that the present invention is not limited to cordless cutters, but rather may be applied to a variety of handheld power tools that utilize a vibratory excitation actuator for vibratory driving of an associated insert tool, whether or not

Power tool network-dependent or independent of the mains with the battery pack 140 is operable. For example, the present invention can also be applied to hand-held drilling and / or sawing tools in which a vibratory excitation actuator is used for the oscillating drive of an associated insertion tool.

The battery pack 140 is illustratively connected to the electronic component 120 via the contact element 143 and associated electrical lines 145. This example has a control unit 123 and other electronic components, such as a power switch 125 and a transformer 129, etc., the z. B. are arranged on a printed circuit board 121 and are connected via electrical lines 127 to the drive unit 170.

The drive unit 170 illustratively has a coupling element 172 designed to transmit vibrations to the cutting blade 130, which is provided with a fastening unit 175 at an axial end pointing away from the tool housing 110, to which the cutting blade 130 is permanently attached in the manner of a standing blade Alternatively, it can be provided as a replaceable blade. Between an opposite, for example, in the interior 1 15 of the tool housing 1 10 arranged axial end of the

Coupling element 172 and a clamping member 186 of the excitation actuator 180 is clamped. The illustrative at least partially disc-shaped clamping member 186 is this according to an embodiment of an associated clamping element 188, z. B. a clamping screw, attached to the coupling element 172. In addition, on the outer circumference of the coupling element 172 illustratively web-like circumferential projection 174 is formed, via which the drive unit 170 is mounted to oscillate on the tool housing 1 10.

It should be noted that a suitable oscillatory mounting of the drive unit 170 on the tool housing 110 is sufficiently known to the person skilled in the art. Therefore, for the sake of brevity, the description is omitted here for a detailed description thereof.

According to one embodiment, the excitation actuator 180 has at least one and illustratively two excitation elements 182, 184, which are plane or planar and have a disk-shaped design, at least in regions, which comprise a piezoelectric material and are therefore also referred to below as "piezor rings." The excitation actuator 180 becomes An exemplary piezoelectric actuator and exemplary piezo rings or disks are described in WO 2010/076184 A1, the disclosure of which is explicitly included in the present application, so that a reference to a piezoelectric actuator is also referred to as a "piezoactuator" detailed description of the piezoelectric actuator 180 and the piezo rings 182, 184 and their functionality can be dispensed with.

The piezo ring 182 is preferably at least partially flat against the clamping member 186 and / or the piezo ring 184 at. The piezo ring 184 is also preferably at least partially flat against the coupling element 172. By fixing the clamping member 186 on the coupling element 172 via the clamping screw 188, the piezo rings 182, 184 are clamped between these two components as described above.

The tool housing 1 10 illustratively has at least a first

Housing portion 192 having a first associated longitudinal axis 198 and a second housing portion 194 with a second associated longitudinal axis 197 on. In the first housing portion 192 z. B. at least partially the drive unit 170 and the electronic component 120 is arranged. In the second housing portion 194 z. B. at least partially arranged the battery pack 140. In this case, the electronic component 120 in the tool housing 1 10 is arranged, for example, at least in sections between the drive unit 170 and the battery pack 140. In the field of electronic component 120 forms the tool housing 1 10 and the first housing portion 192 illustratively a handle portion 150. This example is provided with ergonomic recessed grips 155, 157. According to a first embodiment, the first longitudinal axis 198 is arranged at a predetermined angle 199 to the second longitudinal axis 197. Accordingly, the housing section 194 accommodating the battery pack 140 is illustratively angled away from the housing section 192 accommodating the electronic component 120 and the drive unit 170 in a region 160 and thus forms a comparatively short, essentially the dimensions of,

Battery pack 140 fixed holding area that limits the grip area 150 to prevent slipping a user's hand from the handle portion 150 during operation of the piezoelectric meter 100 in the direction of the battery pack 140 safely and reliably.

During operation of the piezometer 100, a user actuates the operating key hidden in FIG. 1, for example, by the electronic component 120, so that the electronic component 120 and thus the control unit 123 are supplied with power by the battery pack 140. The powered control unit 123 controls the piezoelectric actuator 180 in such a way that it generates vibrations as described in WO 2010/076184 A1, which are transmitted to the coupling element 172 and from there to the cutting blade 130. In this case, the coupling element 172 designed as an interface to the cutting blade 130 preferably serves to reinforce a vibration amplitude generated by the piezoactuator 180.

2 shows a hand-held power tool 200 embodied as an example in the manner of a cutting device, with a tool housing 210 shown in a cutaway view according to a second embodiment. This illustratively forms an inner space 215 in which, at least in sections, the drive unit 170, which is arranged with the electronic component 120 electrically conductively connected via the leads 127 and the battery pack 140 of FIG detailed description is omitted here for the sake of brevity of the description. As described with reference to FIG. 1, the drive unit 170 is provided with the insertion tool 130 designed in the manner of a cutting blade, in particular a standing blade. The tool housing 210 illustratively has at least a first one

Housing portion 292 with a first associated longitudinal axis 297 and a second housing portion 294 with a second associated longitudinal axis 298 on. In the first housing section 292, the drive unit 170 is mounted in an oscillatory manner, for example, at least in sections. In the second housing section 294, the battery pack 140 and the electronic component 120 are arranged at least in sections, for example, wherein the electronic component 120 is arranged in the tool housing 210 at least in sections between the drive unit 170 and the battery pack 140. In the area of the electronic component 120 and the battery pack 140, the tool housing 210 or the second housing section 294 illustratively forms a grip region 250. This is provided, for example, with ergonomic grip recesses 255, 257. According to a second embodiment, the first longitudinal axis 297 is arranged at a predetermined angle 299 to the second longitudinal axis 298. Accordingly, the housing section 292 receiving the drive unit 170 is illustratively angled away from the housing section 294 accommodating the electronic component 120 and the battery pack 140 in a region 260, so that it forms the comparatively long grip region 250. This allows a comfortable grip of the power tool 200, wherein the angled first housing portion 292 also allows easy work in angled and tight working environments. FIG. 3 shows a hand-held power tool 300 embodied by way of example in the manner of a cutting device, with a tool housing 310 cut in a sectional view according to a third embodiment. This illustratively forms an interior space 315 in which, at least in sections, the drive unit 170, which is arranged with this electronic component 120 electrically connected via the lines 127 and the battery pack 140 of FIG. 1 electrically conductively connected thereto via the lines 145, whose detailed description is omitted here for the sake of brevity of the description. The drive unit 170 is, as described in FIG. 1, provided with the insert tool 130 designed in the manner of a cutting blade, in particular a standing blade. The tool housing 310 illustratively has at least a first one

Housing portion 392 with a first associated longitudinal axis 393, a second housing portion 391 with a second associated longitudinal axis 398 and a third housing portion 394 with a third associated longitudinal axis 397 on. In the first housing section 392, the drive unit 170 is mounted to oscillate, at least in sections, by way of example. In the second

Housing section 391, the electronic component 120 is arranged by way of example at least in sections. In the third housing section 394, the battery pack 140 is arranged, for example, at least in sections. In this case, the electronic component 120 in the tool housing 310 is preferably arranged at least in sections between the drive unit 170 and the battery pack 140. In the field of electronic component 120 and the second

Housing portion 391, the tool housing 310 and the second housing portion 391 illustratively forms a handle portion 350. This example is provided with ergonomic recessed grips 355, 357.

According to a third embodiment, the first longitudinal axis 393 is arranged at a first predetermined angle 395 to the second longitudinal axis 398, which in turn is arranged at a second predetermined angle 399 to the third longitudinal axis 397. Here, the angles 395, 399 are given by way of example in such a way that the tool housing 310 is at least approximately arc-shaped. Accordingly, the drive unit 170 receiving first

Housing portion 392 of the electronics component 120 receiving, the second housing portion 391 illustratively in an area 366 - in Fig. 3 - angled clockwise, while the battery pack 140 receiving, third

Housing portion 394 of the second housing portion 391 illustratively in an area 360 - in Fig. 3 - angled counterclockwise. Thus, the handle portion 350 can be bounded on both sides by the housing sections 392, 394 in order to reliably and reliably prevent a user's hand from slipping off the handle area 350.

FIG. 4 shows a hand-held power tool 400 embodied by way of example in the manner of a cutting device, with a tool housing 410 cut in a sectional view according to a fourth embodiment. This illustratively forms an inner space 415, in which, at least in sections, the drive unit 170, which is connected to the electronic unit via the lines 127, is electrically connected. component 120 and the battery pack 140 of FIG. 1, which is electrically conductively connected thereto via the lines 145, are arranged, the detailed description of which is omitted here for the purpose of conciseness of the description. As described with reference to FIG. 1, the drive unit 170 is provided with the insertion tool 130 designed in the manner of a cutting blade, in particular a standing blade.

The tool housing 410 illustratively has at least a first one

Housing portion 492 with a first associated longitudinal axis 493, a second housing portion 491 with a second associated longitudinal axis 498 and a third housing portion 494 with a third associated longitudinal axis 497 on. In the first housing section 492, the drive unit 170 is mounted to oscillate, at least in sections, by way of example. In the second

Housing section 491, the electronic component 120 is arranged by way of example at least in sections. In the third housing section 494, the battery pack 140 is arranged, for example, at least in sections. In this case, the electronic component 120 in the tool housing 410 is preferably arranged at least in sections between the drive unit 170 and the battery pack 140. In the field of electronic component 120 and the second

Housing section 491 forms the tool housing 410 and the second

Housing section 491 illustratively a handle portion 450. This example is provided with ergonomic recessed grips 455, 457.

According to a third embodiment, the first longitudinal axis 493 is arranged at a first predetermined angle 495 to the second longitudinal axis 498, which in turn is arranged at a second predetermined angle 499 to the third longitudinal axis 497. In this case, the angles 495, 499 are given by way of example in such a way that the tool housing 410 is at least approximately S-shaped. Accordingly, the drive unit 170 receiving first

Housing portion 492 of the electronics component 120 receiving, second housing portion 491 illustratively in an area 466 - in Fig. 4 - angled clockwise and the battery pack 140 receiving, third housing portion 494 of the second housing portion 491 illustratively in a region 460 - 4 - also angled clockwise. Thus, the handle portion 450 can be ergonomically formed and the hand of a

User to offer different grip positions.

Claims

claims

1 . Hand-guided power tool (100) with a drive unit (170) for oscillating drive of an insert tool (130), wherein the drive unit (170) is mounted to oscillate on an associated tool housing (1 10) and at least one oscillatory excitation actuator (180), the at least one an excitation element (182, 184) formed of a piezoelectric material and is coupled to a coupling element (172) for transmitting vibrations to the insert tool (130) generated by the excitation actuator (180) during operation of the drive unit (170), wherein a Electronic component (120) for controlling the drive unit (170) is provided, characterized in that the tool housing (1 10) at least a first

Housing portion (192) having a first associated longitudinal axis (198) and a second housing portion (194) having a second associated longitudinal axis (197), wherein the first longitudinal axis (198) at a first predetermined angle (199) to the second longitudinal axis (197). is arranged.

2. Hand-held power tool according to claim 1, characterized in that a battery pack (140) for mains-independent power supply of the drive unit (170) is provided, which is electrically conductively connected to the electronic component (120).

3. Hand-held power tool according to claim 1 or 2, characterized in that the drive unit (170) is arranged at least in sections in the first housing portion (192).

4. Hand-held power tool according to claim 2 or 3, characterized in that the battery pack (140) at least partially in the second housing portion (194) is arranged.

5. Hand-held power tool according to one of the preceding claims, characterized in that the electronic component (120) is arranged at least in sections in the first housing portion (192).

Hand-held power tool according to one of claims 1 to 4, characterized in that the electronic component (120) is arranged at least in sections in the second housing portion (294).

Hand-held power tool according to one of claims 1 to 3, characterized in that the tool housing (1 10) has at least one third housing portion (394) with a third associated longitudinal axis (397), wherein the third longitudinal axis (397) at a second predetermined angle (397) 399) is arranged to the second longitudinal axis (398).

Hand-held power tool according to claim 7, characterized in that the electronic component (120) at least partially in the second housing portion (391) is arranged and the battery pack (140) at least partially in the third housing portion (394) is arranged.

Hand-held power tool according to claim 7 or 8, characterized in that the first and second predetermined angle (395, 399) are predetermined such that the tool housing (310) is at least approximately arcuate. 10. Hand-held power tool according to claim 7 or 8, characterized in that the first and second predetermined angle (495, 499) are predetermined such that the tool housing (410) is at least approximately S-shaped.

Hand-held power tool according to one of the preceding claims, characterized in that the electronic component (120) in the tool housing (1 10) in the region between the drive unit (170) and the battery pack (140) is arranged.