EP2008776B1 - Electric tool, in particular rechargeable battery electric tool - Google Patents

Description

The invention relates to a power tool according to the preamble of claim 1. In such, in particular as a cordless power tool, designed power tools are drills, screwdrivers, angle grinders, planer, milling or the like.

Such, from the DE 196 04 346 A1 Known power tool has a handle having a power tool housing in which an electric motor is located. For energy supply of the electric motor is an energy storage, namely a battery that can be fastened in and / or on the power tool housing. Furthermore, in and / or on the power tool housing, in and / or on the handle of the power tool housing, a manually operable actuator arranged with the aid of a switching means for the power supply of the electric motor can be actuated. The actuator acts on its actuation by the user on the switching means. The arrangement of the electrical leads from the energy storage to the individual components in the power tool housing and the electric motor is complex and expensive in the known power tool.

From the WO 2006/008057 A1 is also a power tool with a handle having power tool housing known. An energy storage device can be fastened to the power tool housing at a foot remote from the power tool housing at the end of the handle. The handle is a manually operated Actuating member for actuating a switching element for the power supply of the electric motor. The switching element is arranged in the energy storage housing of the energy store. A cooperating both with the actuator and with the switching element and / or can be brought into operative connection, disposed in the power tool housing transmission means is used to transmit the movement of the actuator to the switching element.

The EP 1 788 597 A1 shows a power tool with an attachable energy storage. In the energy storage housing of the energy storage are both the actuator and the switching means for actuating the power supply for the electric motor.

The WO 2007/058596 A1 relates to a power tool with a handle, at the foot of an energy storage device can be fastened. In the handle is an actuator for an electrical switch for actuating the power supply of the electric motor. Between the energy storage and the handle, an additional module for the realization of additional functions for the power tool can be used.

Finally, the shows US 2002/0197527 A1 a power tool with an energy storage, which is provided with a means for cooling. For this purpose, a fan may be arranged in the energy store.

The invention is based on the WO 2006/008057 A1 the task of simplifying the design of the electrical leads in the power tool housing. In particular, the optimal space for the components in the power tool to be identified with minimal wiring and good cooling and these components are arranged there.

This object is achieved in a generic power tool by the characterizing features of claim 1.

In the power tool according to the invention, the switching element in and / or on the part of the power tool housing, on which the energy storage is located, and arranged in a module. The module has a module housing, so that the module is designed as a preassemblable unit in the manner of a switch-battery interface. A space-saving installation of the module in the power tool housing is given by the fact that the module housing is arranged at the transition from the handle to the energy storage in the foot on the handle of the power tool, the foot is located on the end facing away from the power tool housing end of the designed example as a handle shell handle , In the serving for the attachment of the battery foot enough space for the module is present and because of the proximity to the energy storage simplifies and reduces the wiring effort considerably. Nevertheless, advantageously, the actuator can be arranged largely without restrictions at the desired location in and / or on the power tool housing, so that the ergonomics of the user is guaranteed. Further embodiments of the invention are the subject of the dependent claims.

In a further embodiment, the module is a complete switching and / or control module. In addition, electronics may be arranged in the module for controlling and / or regulating the power supply for the electric motor. This control and / or power electronics for the motor may be in the form of a pulse width modulation, a phase control, a phase control o. The like. Be configured. Thus, the electric motor with a the movement path of the actuator associated speed, the movement path of the actuator associated torque o. The like. Operable. In this way, it is advantageously possible to arrange the switch, the engine control and / or power electronics as well as the battery management in a compact manner in the power tool. In a simple manner, the electronics can be arranged on a circuit board located in the module. Such an arrangement mainly carries new battery technologies, such as lithium-ion batteries, bill, in which complex electronics for battery management is necessary.

Conveniently, the module has a contact with the energy storage, so that when you plug the battery on the power tool foot simultaneously the electrical connection between the energy storage and the module is made. Furthermore, an electronics for the management of the energy storage in the manner of a battery management can be arranged in the module. It is also advisable to switch contacts for switching the electric motor on and / or off, for the right / left running of the electric motor, for the brake of the electric motor o. The like., A potentiometer and / or sensors for the speed adjustment , LEDs for status display, function display o. The like. For the user, input keys for additional functions of the power tool in the module o. The like. Arrange. In order to dissipate heat generated in the module effectively, a cooling element, in particular a fan, can be arranged on the module. Advantageously, with the help of the cooling element in addition the battery can be mitgekühlt. The arrangement of such an active cooling element is particularly suitable for power tools with a higher performance, possibly can also additionally attach a heat sink to the module. If the power tool has a lower power consumption, only one heat sink can be sufficient. Electrical lines, for example, two motor cables can be performed by the module in the handle extending to the electric motor, which is created with the help of the module, a complete battery plate for the power tool foot. For ease of installation, the module housing can be mounted in the foot inserted. The fan and / or the heat sink are arranged to increase the efficiency for the cooling of the module in the module housing so that they face an opening in the foot. It may be appropriate that the fan and / or the heat sink at the opening protrude from the foot.

An indirect action of the actuator on the switching means can be realized in a simple manner that cooperating in the power tool housing with both the actuator and the switching means and / or in Active connection engageable transfer means is arranged. With the aid of the transmission means, the movement of the actuator is transferable to the switching means. As a means of transmission is a rigid rod or a flexible element, such as a flexible shaft, which fits into a variety of handle shell geometries. On the module is a mechanical interface, such as a hexagonal receptacle, in which engages the transmission means, so as to transmit the movement of the actuator to a module located in the actuator for cooperation with the switching element without slip. In order to allow switching between the clockwise and counterclockwise rotation of the electric motor in a compact and simple manner, a slider cooperating with the transmission means can be arranged in the power tool housing.

Instead of a mechanical transmission means, the actuator can act on a switch for generating a switching signal, wherein the switching signal encodes the on / off switching, the speed adjustment and / or the right / left run for the electric motor. In particular, for adjusting the speed corresponding to the adjustment of the actuator by the user, it then makes sense that a potentiometer is used as a switch. The switch is conveniently in the handle and the respective switching signal is then transmitted in a simple manner via lines to the module to its control.

The switching element may cost-effectively be an electrical switch with an electromechanical contact system. If the electric motor is operable in both the clockwise and counterclockwise, it makes sense to provide a contact system for the right and for the left-hand rotation of the electric motor. Alternatively, the switching means may be a sensor switch, such as a force sensor, a Hall sensor, a magnetoresistive sensor, an inductive sensor, a capacitive sensor or the like, which advantageously operate wear-free. Such a sensor switch also allows a compact, space-saving arrangement in the module.

In a further compact design for the module, a cam for switching the electromechanical contact system is arranged on the actuating element. The actuating element can be reset by means of a spring. Furthermore, the actuating element can be accommodated in a sealed by a seal opening in the module housing, whereby the module is protected from harmful effects, such as moisture, dust o. The like., Housed in the module housing. Conveniently, the actuator further adjusts the potentiometer for the Drchzahlcinstellung of the electric motor.

• Steuer- und/oder Leistungselektronik für den Motor,
• Akkukontaktierung,
• Akkumanagement,
• Schaltkontakte, beispielsweise zum Ein-/Aus-Schalten, für den Rechts-/Links-Lauf, für die Bremse o. dgl. des Elektromotors,
• die Drehzahlverstellung des Elektromotors über ein Potentiometer oder mittels Sensoren,
• Zusatzfunktionen, wie Leuchtdioden (LED's), Eingabetasten o. dgl.,

integriert werden. Es müssen dann nur noch zwei Motorleitungen in Richtung zum Motor geführt werden. Die Betätigung erfolgt über ein Bedienelement als Betätigungsorgan, das sich an der Stelle heutiger Bedienelemente befindet, wobei das Bedienelement als Drückerkappe, Rechts-Links-Schieber o. dgl. ausgestaltet ist Die Übertragung zum Switch-Battery-Interface erfolgt über eine einfache Mechanik, die die Drückerbewegung für die Drehzahlverstellung und/oder die Bewegung des Umschaltschiebers kombiniert. Die Übertragung kann über eine steife Stange mittels einer Schwenk- und/oder Drehbewegung erfolgen. Es kann auch ein flexibles Element in der Art einer biegsamen Welle zur Übertragung verwendet werden, welches in die unterschiedlichsten Griffschalengeometrien paßt. Das Switch-Battery-Interface besitzt ein mechanisches Interface, beispielsweise eineIn summary, the following can be stated for a particularly preferred embodiment. Almost all power tools have a foot in the lower part of the serving as a handle grip tray where the plug connection for the battery is located. In this area is usually so much space that a complete switching and / or control module can be accommodated in the manner of a switch-battery interface. With appropriate configuration, the following functions can be used in this switch-battery interface, for example

• Control and / or power electronics for the engine,
• Akkukontaktierung,
• Battery Management,
• Switching contacts, for example for switching on / off, for the right / left run, for the brake o. The like. Of the electric motor,
• the speed adjustment of the electric motor via a potentiometer or by means of sensors,
• Additional functions, such as light-emitting diodes (LEDs), input keys or the like,

to get integrated. Then only two motor cables have to be led in the direction of the motor. The actuation takes place via an operating element as an actuating element, which is located at the point of today's operating elements, wherein the operating element is designed as a pusher cap, right-left slider o. The like. The transmission to the switch-battery interface via a simple mechanism that combined the pusher movement for the speed adjustment and / or the movement of the changeover spool. The transmission can take place via a rigid rod by means of a pivoting and / or rotary movement. It can also be a flexible element in the manner of a flexible shaft for transmission can be used, which fits into a variety of handle shell geometries. The switch-battery interface has a mechanical interface, such as a

Hexagonal hole into which the linkage engages, transferring the movements to an internal element. Alternatively, a simple switch comes into question, which passes on the signals for on / off, for the speed adjustment and / or for the right / left run via lines to the switch-battery interface. Also, a cooling element, such as a fan can be integrated into the switch-battery interface, so that advantageously the battery can be mitgekühlt.

The advantages achieved by the invention are in particular that costs and installation costs are reduced for the entire power tool. In addition, additional functions, such as LEDs and input elements, fans for cooling o. The like. Easy and inexpensive to integrate. With the help of the invention, the essential and necessary functions in an element, namely the switch-battery interface, integrated, which is located at a convenient place in the power tool. In addition, interfaces are eliminated, which benefits the reliability as well as the cost-effectiveness. The area on the handle of the power tool, on which the operator's hand rests, can be made very slim. This gives designers extra freedom and ergonomics for the user.

Fig. 1

schematisch ein Elektrowerkzeug mit einem Energiespeicher,

Fig. 2

die Griffschale des Elektrowerkzeugs mit Energiespeicher aus Fig. 1 in perspektivischer Ansicht,

Fig. 3

einen Ausschnitt aus der geöffnet dargestellten Griffschale mit Betätigungsorgan und Übertragungsmittel,

Fig. 4

das Zusammenwirken von Betätigungsorgan und Übertragungsmittel in vergrößerter Darstellung,

Fig. 5

die Ausgestaltung der Umschaltung für den Links-/Rechtslauf des Elektromotors,

Fig. 6

die Umschaltung für den Links-/Rechtslauf des Elektromotors in einer weiteren Darstellung,

Fig. 7

den Modul in perspektivischer Ansicht,

Fig. 8

den Modul aus Fig. 7 in einer geöffneten Darstellung,

Fig. 9

das Schaltelement im Modul in einer vergrößerten Darstellung,

Fig. 10

das Schaltelement aus Fig. 9 in weiter vergrößerten Darstellung,

Fig. 11

das Schaltelement wie in Fig. 9 in einer weiteren Perspektive,

Fig. 12

die Draufsicht auf das Schaltelement aus Fig. 9,

Fig. 13

den Modul in einer weiteren Ausgestaltung,

Fig. 14

den Modul aus Fig. 13 in einer teilweise geöffneten Darstellung,

Fig. 15

die Anordnung des Moduls im Fuß des Elektrowerkzeugs,

Fig. 16

die Anordnung des Kühlkörpers des Moduls im Fuß des Elektrowerkzeugs und

Fig. 17

die Griffschale mit dem Modul entsprechend einer weiteren Ausführung.

An embodiment of the invention with various developments and refinements is shown in the drawings and will be described in more detail below. Show it

Fig. 1

schematically a power tool with an energy storage,

Fig. 2

the grip of the power tool with energy storage Fig. 1 in perspective view,

Fig. 3

a detail of the handle shell shown with open actuator and transmission means,

Fig. 4

the interaction of actuator and transmission means in an enlarged view,

Fig. 5

the configuration of the switching for the left / right rotation of the electric motor,

Fig. 6

the changeover for the left / right rotation of the electric motor in a further illustration,

Fig. 7

the module in perspective view,

Fig. 8

the module off Fig. 7 in an open presentation,

Fig. 9

the switching element in the module in an enlarged view,

Fig. 10

the switching element Fig. 9 in a further enlarged view,

Fig. 11

the switching element as in Fig. 9 in another perspective,

Fig. 12

the top view of the switching element Fig. 9 .

Fig. 13

the module in a further embodiment,

Fig. 14

the module off Fig. 13 in a partially opened presentation,

Fig. 15

the arrangement of the module in the base of the power tool,

Fig. 16

the arrangement of the heat sink of the module in the foot of the power tool and

Fig. 17

the grip with the module according to another embodiment.

In Fig. 1 is a schematic type of a power tool 1, which is a cordless power tool, namely a cordless drill is shown. The power tool 1 has a power tool housing 2 with a handle 5 in the manner a grip, wherein in the power tool housing 2, an electric motor 3 is located. For the power supply of the electric motor 3 is an energy storage 4, which is in particular a kind of battery for the power supply of the electric motor 3. The energy storage 4 can be fastened in and / or on the power tool housing 2, namely by insertion on a foot 6, which is located at the end of the handle 5 facing away from the power tool housing 2, as well as Fig. 2 can be seen.

In and / or on the power tool housing 2, in particular in and / or on the handle 5, is a movable actuator 7 for actuating a in Fig. 8 arranged closer switching element 8 for the power supply of the electric motor 3. The actuator 7 is manually actuated by a pressure movement by the user, so as to turn on and off the power supply for the electric motor 3. For this purpose, the actuating member 7 acts now in its movement directly and / or indirectly actuated on the switching element 8 a. The switching element 8 is arranged in and / or on the lower part 6 of the power tool housing 2, on which the energy store 4 is located. That is, the switching element 8 is arranged in the receptacle of the energy storage 4 serving foot 6 on the handle 5 of the power tool 1.

Conveniently, the switching element 8 is arranged in a module 9. Module 9, which is in Fig. 7 can be seen as a single part, has a module housing 10. The module housing 10 is according to the Fig. 1 located at the transition from the handle 5 to the energy storage 4 in the foot 6. For ease of installation, the module housing 10 is mounted in the foot 6 inserted, like the Fig. 15 can be seen.

If desired, the speed of the electric motor 3 can be controlled and / or regulated, so that the rotational speed corresponding to the adjustment of the actuator 7, which is generated by the user by pressing the actuator 7 is set. The switching element 8 is then with an in Fig. 14 schematically shown electronics 11 as a type of control and / or power electronics for controlling and / or regulating the power supply for the electric motor 3 in conjunction. The electronics 11 may be designed in the manner of a pulse width modulation circuit, if the electric motor 3 is operated with DC voltage. In an AC powered electric motor Of course, the electric motor 3 with the adjustment of the actuator 7 or any other setting associated torque o. The like. By means of the electronics 11 be operable, resulting in a use of the power tool 1 can be advantageous as a screwdriver. The electronics 11 is also arranged in the module housing 10, on a printed circuit board 12, so that the module 9 is configured as a complete switching and / or control module for the power tool 1. The module 9 thus forms a type of switch-battery interface, which can be produced as an independent module and is used only during assembly in the power tool housing 2.

As based on Fig. 7 can be seen, the module 9 has a trained as a connector strip contacting 13 to the energy storage 4. The electrical connection between the module 9 and the energy storage 4 is thus produced when inserting the energy storage device 4 in the power tool housing 2. Since the module 9 comprises all the components for controlling the electric motor 3, as will be explained in more detail below, it then suffices to guide two electrical lines extending in the handle 5 as motor cables from the module 9 to the electric motor 3.

On the circuit board 12 may not be further shown electronics for the management of the energy storage 4, that is arranged for the battery management, which advantageously offers to use the electronics 11 for this purpose. How the particular Fig. 14 can be seen, the switching element 8 located in the module 9 comprises switching contacts for the switching on and / or off of the electric motor 3. It serves according to Fig. 12 a switching contact 21 for switching the clockwise rotation of the electric motor 3 and the other switching contact 21 'for switching the left-hand rotation of the electric motor 3. A not further shown switching contact is used for acting on switching off the power tool 1 short-circuit brake of the electric motor 3. Of course the module 9 further switching contacts for switching other functions of the power tool 1 include. Furthermore, located in the module 9 arranged on the circuit board 12 potentiometer 23, as well as the Figure 10 can be seen, which is adjusted according to the movement of the actuator 7 for setting a corresponding speed of the electric motor 3. Of course you can for the speed adjustment of the electric motor 3 and / or instead of the switch contacts also sensors are used. Finally, light-emitting diodes for status display for the module 9 and / or input keys for additional functions can be arranged on the module 9.

Furthermore, it is advisable, for cooling the electronics 11, a cooling element, in particular a fan 14 according to the Fig. 13 to provide on the module housing 10. Advantageously, with the help of the fan 14 in the module 9, the energy storage 4 can be mitgekühlt simultaneously. Of course, alternatively or additionally, an in Fig. 14 visible heat sink 15 may be located on the module housing 10. In order to achieve a good heat dissipation from the interior of the power tool housing 2, the fan 14 and / or the heat sink 15 faces an opening extending to the outside in the foot 6. In this case, the heat sink 15, for example, in the manner of a design element on the foot 6 protrude from the power tool housing 2, as in Fig. 16 is shown

As already stated, the actuating member 7 acts on the switching element 8 directly and / or indirectly during its movement. For indirect transmission of the movement of the actuating member 7 on the switching element 8 is in an expedient embodiment in the power tool housing 2 a in Fig. 3 shown transmission means 16 which cooperates with both the actuating member 7 and the switching element 8 and / or can be brought into operative connection with the switching element 8. The transmission means 16 is formed as a rigid rod. A mechanical interface, consisting of an in Fig. 7 visible hexagonal receptacle 17, in which engages the rod 16, transmits the movement of the actuator 7 to a befindliches in the module 9, in Fig. 9 shown actuator 18, which then in turn actuates the switching elements 8 and adjusted the potentiometer 23 for the Drehzahleinstcllung of the electric motor 3. The verkrochbare of the rod 16 actuator 18 is reset by means of a spring 26, as the Fig. 14 can take. A seal 25 on the actuating element 18 seals off the opening on the module housing 10 for receiving the actuating element 18.

The interaction between the actuator 7 and the rod 16 is closer in Fig. 4 shown. The caused due to the pressure by the user linear movement of the actuator 7 is by means of a Führungsgliedcs 28 on Actuator 7 and an eccentric 27 implemented on the rod 16 in a rotational movement of the rod 16, wherein this rotational movement in turn the actuator 18 suspects. How to continue the Fig. 5 and Fig. 6 takes, with the help of the rod 16 and the left / right switching for the electric motor 3, which is switchable by means of a arranged in the power tool housing 2 slide 24 by the user, transmitted accordingly. For this purpose, the eccentric 27 is moved by means of the slider 24 to the corresponding receiving a guide cam 29 in the guide member 28.

Instead of a stiff rod 16 as a transmission means, this can also be a flexible element use, which is not shown. A flexible shaft as such a flexible element fits in a simple manner in a variety of handle shell geometries. Another alternative, in Fig. 17 is shown, is that the actuator 7 acts on a located in the handle 5 switch 19 for generating a switching signal for on / off switching and / or for the right / left running. As far as the speed adjustment of the electric motor 3 to be made with the help of the actuator 7, offers a potentiometer switch as a switch 19, otherwise a simple electrical switch is sufficient. The corresponding switching signal is then transmitted via lines 20 to the module 9 for its control.

The switching element 8 may be a conventional electrical switch having an electromechanical contact system 21, as shown in FIG FIG. 11 or FIG. 12 is shown. In each case, a contact system 21 serves for switching the clockwise rotation of the electric motor 3 and a contact system 21 'for switching the counterclockwise rotation. The contact systems 21, 21 'are according to the Fig. 10 connected by means of a cam member 22 arranged on the actuating element 18. Alternatively, the switching element 8 can also be a sensor switch, such as a force sensor, a Hall sensor, a magnetoresistive sensor, an inductive sensor, a capacitive pressure sensor or the like, which advantageously operate wear-free.

The module 9 for a power tool 1 as described above thus comprises the switching element 8 and / or an electronics 11, wherein the module 9 with the im and / or on the power tool housing 2 located actuating member 7 for operation of the power tool 1 cooperates. The module 9 is provided with a module housing 10 and thus forms an independent unit that can be produced separately. This unit can during assembly of the power tool 1 in a simple manner in the power tool housing 2 according to the Fig. 15 be arranged in the foot 6 of the handle 5.

However, the invention is not limited to the described and illustrated embodiment. Rather, it also encompasses all expert developments within the scope of the invention defined by the claims. Thus, the invention, in particular the module described, not only in power tools but also in other electrical appliances that are equipped with an energy storage, such as electrical household appliances, electrical gardening equipment, machine tools o. The like., And for electronics of electronically commutated (EC) motors use Find.

Reference numeral list:

1:

power tool

2:

Electric tool housing

3:

electric motor

4:

energy storage

5:

Handle / handle shell

6:

Foot (from handle) / (lower) part (from power tool case)

7:

actuator

8th:

switching element

9:

module

10:

module housing

11:

electronics

12:

circuit board

13:

contact

14:

Fan

15:

heatsink

16:

Transmission means / rod

17:

Hexagonal Drive

18:

actuator

19:

Switch (for generating switching signal)

20:

management

21.21 ':

(electromechanical) contact system / switching contact / switch

22:

cam

23:

potentiometer

24:

pusher

25:

poetry

26:

Spring (on the actuator)

27:

eccentric

28:

guide member

29:

guide curve

Claims (15)

1. A power tool with a power tool housing (2) having a handle (5), with an electric motor (3) located in power tool housing (2), with an energy storage system (4) in the form of a battery for the energy supply of the electric motor (3), as well as with a movable actuating member (7) arranged in and/or on the power tool housing (2) for actuating a switch element (8) for the energy supply of the electric motor (3), wherein the energy storage system (4) can be attached to a base (6) in and/or on the power tool housing (2) located at the end of the handle (5) turned away from the power tool housing (2), and wherein the actuating member (7) when it moves acts in an actuating manner on the switch element (8), while in the power tool housing (2) a transmission means (16) is arranged, which interacts and/or can be brought into operative connection both with the actuating member (7) as well as with the switch element (8), in such a way that the movement of the actuating member (7) can be transmitted to the switch element (8), characterized in that the switch element (8) is located in a module (9), that the module (9) has a module housing (10), and that the module housing (10) is located at the transition from the handle (5) to the energy storage system (4) in the base (6) on the handle (5) of the power tool (1) serving to accommodate the energy storage system (4).
2. A power tool according to Claim 1, characterized in that an electronics assembly (1) is arranged in the module (9) for the control and/or regulation of the energy supply for the electric motor (3) in the form of a pulse width modulation, a phase angle control or a phase cutting control, namely that the electric motor (3) can be operated with a rotational speed assigned to the movement path of the actuating member (7) or with a torque assigned to the movement path of the actuating member (7).
3. A power tool according to Claim 2, characterized in that the electronics assembly (11) is arranged on a conductor plate (12) located in the module (9).
4. A power tool according to Claim 1, 2 or 3, characterized in that the module (9) has a contacting (13) for the energy storage system (4) and/or an electronics assembly for the management of the energy storage system (4) and/or switch contacts (21) and/or a potentiometer (23) and/or sensors for the speed adjustment and/or light-emitting diodes and/or input keys, and that electric lines running in the handle (5) are routed from the module (2) to the electric motor (3).
5. A power tool according to any one of Claims 1 to 4, characterized in that the module (9) has a fan (14) and/or a cooling element (15), and that the fan (14) and/or the cooling element (15) is facing an opening in the base (6).
6. A power tool according the Claim 5, characterized in that the fan (14) and/or the cooling element (15) protrudes from the base (6).
7. A power tool according to any one of Claims 1 to 6, characterized in that the module housing (10) is attached in a pluggable manner in the base (6).
8. A power tool according to any one of Claims 1 to 7, characterized in that a rigid rod (16) or a flexible element serves as the transmission means, and that a mechanical interface, in which the transmission means engages, transmits the movement of the actuating member (7) to an actuating element (18) located in the module (9).
9. A power tool according to any one of Claims 1 to 8, characterized in that a slide (24) interacting with the transmission means (16) is arranged in the power tool housing (2).
10. A power tool according to any one of Claims 1 to 9, characterized in that the actuating member (7) acts on a switch (19) to generate a switch signal, that the switch (19) is arranged in the handle (5), and that the switch signal is transmitted via lines (20) to the module (9) for its control.
11. A power tool according to any one of Claims 1 to 10, characterized in that the switch element (8) is an electrical switch with an electro-mechanical contact system (21, 21') and/or a sensor switch.
12. A power tool according to any one of Claims 1 to 11, characterized in that on the actuating element (18) a cam disk (22) is arranged for switching the contact system (21, 21').
13. A power tool according to any one of Claims 1 to 12, characterized in that the actuating element (18) can be reset by means of a spring (26).
14. A power tool according to any one of Claims 1 to 13, characterized in that the actuating element (18) is received in an opening in the module housing (10) sealed by means of a seal (25).
15. A power tool according to any one of Claims 1 to 14, characterized in that the actuating element (18) adjusts the potentiometer (23) for the speed setting of the electric motor (3).

Images