WO2009018813A2

WO2009018813A2 - Control device, particularly in the type of an electric switch for hand-held power tools

Info

Publication number: WO2009018813A2
Application number: PCT/DE2008/001273
Authority: WO
Inventors: Alfons Steidle; Timo Schutzbach; Klaus Fiederer; Gerhard Niklewski; Daniel Hafen; Thomas BRÜNTRUP
Original assignee: Marquardt Gmbh
Priority date: 2007-08-07
Filing date: 2008-08-06
Publication date: 2009-02-12
Also published as: CN101802950B; WO2009018813A3; SI2179427T1; EP2179427A2; EP2179427B1; CN101802950A

Abstract

The invention relates to a control device, particularly an electric switch (1) for use for a hand-held power tool, such as a hand-held power tool using a rechargeable battery and/or mains operation, for example drills, grinders, saws, planes, angle grinders and the like, comprising an electric motor. The switch (1) comprises a housing (2) for receiving at least one heat-generating power element, such as a power transistor, a MS-FET, a triac, or the like, which is particularly arranged in an electric circuit arrangement. The circuit arrangement is used, for example, to control and/or regulate the electric motor through a corresponding control and/or regulation of the electric load current flowing through the power element to the electric motor. The heat-generating power element and/or at least parts of the circuit arrangement are thermally conductively connected to a cooling body (6) disposed on the outside of the housing (2). The cooling body (6) comprises at least two regions, wherein the first region of the cooling body (6) is arranged in the housing (2) such that the heat-generating element and/or at least parts of the circuit arrangement are directly connected to the first region, and wherein the second region (12) of the cooling body (6) protrudes out of the housing (2), particularly in the manner of a lateral emergence on both sides out of the housing (2). Furthermore, an electric switch (1) having a resilient contact bearing is created, wherein the movement of the operating element (3) is deflected approximately in the transversal direction relative to the action on the contact system. Finally, the electric switch (1) can be provided with an on-blocking device (24) having a blocking member, wherein the blocking member comprises a plastic web.

Description

Control device, in particular in the nature of an electric switch for electric hand tools

The invention relates to a control device according to the preamble of patent claim 1 or an electrical switch according to the preamble of claim 10, 18 or 23.

Such controllers are mainly used as electrical switches for an electric hand tool with an electric motor, such as for a cordless and / or power tool, use. These power tools may be drills, grinders, saws, planers, angle grinders, or the like.

From DE 195 08 925 Al an electrical switch for an electric tool is known, which has a housing for receiving an electrical circuit arrangement for controlling and / or regulating the electric motor. Such a circuit arrangement may be an electronic component for the control and / or regulation of the rotational speed of the electric motor, for example by pulse width modulation. Further applications for such an electronic component, the control and / or regulation of the freewheel, for example by diodes, the torque, for example by current control, or other characteristics such as automatic shutdown, automatic control, electronic braking, electronic soft start of the electric motor o. The like., be. The circuit located in the housing now again contains at least one component, such as a power semiconductor, a power transistor, a MOS-FET, a triac o. The like., Which serves for the corresponding control and / or regulation of the flowing through the component to the electric motor electrical load current. Due to its function as a power component, the component generates a power loss in the form of heat, which is dissipated from the housing. Likewise, other parts of the circuit can generate heat loss. To dissipate this heat is a heat sink located on the outside of the housing, with which the heat-generating component and / or at least parts of the circuit arrangement are in heat-conducting connection. It has now been found that in some cases, especially in Dauerlast- and / or blocking case of the power tool in previous heat sinks, the heat dissipation is not enough. It is obvious that in such cases, the reliability of the switch and thus the power tool suffers.

From DE 197 08 939 Al an electrical switch with a housing for a power tool is also known. In the housing is a contact system comprising a fixed contact and a cooperating, on a contact bearing movably arranged switching contact. An actuator disposed on the housing is used for switching action on the contact system. The contact system consists of several parts. In some cases, for example, with slim handles of a two-hand angle grinder, also the space for receiving the switch in the handle is not sufficient.

Finally, from DE 36 38 952 Al an electrical switch with a housing for a power tool is known. The housing contains a contact system. A housing arranged on the, movable in an actuating direction actuator is used for switching action on the contact system. The switch has a Einschaltsperreinrichtung for the actuator, wherein the Einschaltsperreinrichtung comprises a ramp member on the housing and a locking member on the actuator, such that the actuator is displaceable approximately transversely to the actuating direction to overcome the Einschaltsperreinrichtung, in particular the casserole member. In this Einschaltsperreinrichtung a metal bolt is used as a locking member, which is a relatively expensive item.

The invention has for its object to further develop the heat sink such that the removal of heat from the housing is improved. In particular, an effective Cooling of the power semiconductor in Dauerlast- and / or blocking case taking advantage of existing in the device cooling air flow and / or observance of the cramped space in the handle shell and / or consideration of easy Kontaktiermöglichkeit between switch and motor be given.

Furthermore, it is an object to further develop the contact system such that the number of parts is reduced. In addition, the switch is to be developed such that it is suitable for use in a confined space. Finally, it is still an object to further develop the switch-lock device such that the switch is less expensive.

This object is achieved in a generic control device by the characterizing features of claim 1. Furthermore, the above objects are achieved in a generic switch by the characterizing features of claim 10, 18 or 23.

In the control device according to the invention, the heat sink has at least two regions. The first region of the heat sink is arranged in the housing, such that the heat-generating component and / or at least parts of the circuit arrangement are in direct connection with the first region, that is to say are fastened to the first region in heat-conducting connection. The second region of the heat sink projects out of the housing, in particular in the manner of a discharge on both sides of the housing. Further embodiments of the invention are the subject of the dependent claims.

In a conventional manner, in a power tool, the switch in the power tool housing, and preferably located in the handle. In order to achieve a further improvement of the heat dissipation, the second region of the heat sink extends into the region of the cooling air flow for the power tool, which serves primarily for cooling the electric motor. Contrary to previous embodiments, the second area is thus continued until the cooling air flow.

The heat sink can be adapted to the dissipated heat accordingly. For this purpose, the heat sink is designed stepped in terms of its thickness. The first area of the Heat sink is provided above all in the area of the power semiconductor and / or the power component with a higher material strength, so as to further improve the heat dissipation.

A part of the projecting into the cooling air flow second portion of the heat sink may be configured like a wing. Above all, the wing-like second area then projects into the cooling air flow for the power tool. Furthermore, the wing-like second region of the heat sink with slots, apertures, openings o. The like. Be provided to increase the surface and / or facilitate the air flow for the passage of air. Such an embodiment is adapted to the space in the power tool in a special way and optimizes the heat dissipation.

The mounting of the heat sink in the housing can be accomplished in a simple manner that the second region is angled at the exit from the housing with respect to the first region. It is advisable that the angle is approximately 90 °. The second area expediently bears against the wall of the housing. A simple mounting of the heat sink is given when the heat sink is attached, for example by means of latching and / or snap connections for the second area on the housing.

In the usual way, the housing may include a base and a lid. Conveniently, the heat sink is attached to the base. For ease of installation, the cover can be fixed by means of latching and / or snap connections on the base, in which case the second region of the heat sink has a recess for the latching and / or Schanpp connection between the cover and the base.

In adaptation to the direction of flow of the cooling air flow, the wing-like second region can be designed to project at an angle from the remaining second region. The angle between these regions is preferably between 90 ° and 160 °, in particular approximately 120 °. In order to be optimally located in the cooling air flow, the second wing-like area projects beyond the housing. A further optimization of the heat dissipation can thereby achieve that the wing-like second area is at least partially provided with a higher material thickness.

For cost-effective manufacturability of the heat sink is largely formed in one piece. It makes sense to make the heat sink in the manner of a stamped and bent part of a milled and / or rolled sheet metal strip. Furthermore, the range of higher material thickness on the heat sink by plating, welding, soldering o. The like. Be prepared. As a material for the heat sink are good thermally conductive materials such as copper, aluminum, steel o. The like. At.

In summary, it can be found for a particularly preferred embodiment that the heat sink is designed in a stepped manner with a higher material thickness in the region of the power semiconductor. The arrangement of the heat sink in the switch takes place with a discharge on both sides of the switch housing and a continuation of the heat sink into the area of the device cooling air flow. Optionally, the continuation may be provided with slots for the passage of air to increase the surface area and / or facilitate the air flow.

In the switch according to the invention, the contact bearing is designed as a resilient bearing, such that the contact force is generated by the contact bearing itself. In particular, the contact force is generated by the spring force of the contact bearing. An otherwise usual, serving to generate the contact force compression spring or leaf spring is thus not necessary, whereby items and thus costs are saved. Further embodiments of the invention are the subject of the dependent claims.

In the usual way, a control and / or regulating electronics for the power tool can be arranged in the housing of the switch. Conveniently, then in the housing a circuit board for receiving electrical and / or electronic components for the control and / or control electronics is located. For ease of assembly, the contact bearing may be soldered directly to the circuit board. In a simple and inexpensive to manufacture embodiment, the contact bearing is provided with an approximately U-shaped section. This U-shaped section has a certain elasticity, which in turn serves to generate the spring force which makes up the contact force. For good installation, the U-shaped section is arranged approximately parallel to the printed circuit board. In a simple manner, a leg of the U-shaped portion may be inserted by means of at least one protruding plug foot on the circuit board. It then makes sense further that the leg is soldered to the plug-in, with the circuit board.

m further embodiment of the one leg opposite another leg of the U-shaped portion has a protruding approximately perpendicularly from the other leg bearing surface, wherein the bearing surface adjoins the end of the other leg of the U-shaped portion. A simple production of the bearing surface is given by the bearing surface consists of an approximately 180 ° folded portion of the other leg.

The switching contact can be configured in a functionally reliable manner as a pivotable rocker with two lever arms. Next, the switching contact has a bulge between the lever arms for pivotal mounting of the rocker on the bearing surface. The actuator acts via an actuator by means of an approach to the two lever arms to pivot the switch contact.

With powerful electric motors, correspondingly high currents flow, which can increase even more in the event of a fault, for example during a blockage. In such cases, welding of the contacts may occur so that the power tool can not be turned off, which in turn impairs safety for the user. To counteract this danger, the following development of the contact system is appropriate. The switching contact acts in this further embodiment together with the actuating member, that a sliding movement transverse to the opening and / or closing movement of the switching contact can be effected. This results in a kind of forced tear of the welded contacts. In order to provide a compact switch, a bus bar from a leg of the U-shaped portion as an electrical connection 201 an outwardly projecting from the housing electrical connection to a solder connection on the circuit board o. The like. Lead. The busbar is expediently approximately perpendicular from one leg of the U-shaped section. For ease of manufacture, the busbar and / or the U-shaped section and / or the bearing surface and / or the plug-in foot are integrally formed, preferably in the manner of a stamped and bent part. As materials for the contact bearing are well electrically conductive materials such as copper, copper beryllium o. The like., Suitable.

In summary, it can be found for a particularly preferred embodiment that a resilient bearing generates the contact force, whereby a compression spring or a leaf spring is eliminated. The bearing is soldered directly to the PCB. A forced tear is effected via a sliding movement transversely to the opening and / or closing movement.

In the switch according to the invention, the actuator acts on a substantially vertically movable plunger. The plunger is articulated to a substantially horizontally movable slide. The slider in turn acts on the contact system for switching such that the movement of the actuator is deflected approximately in the transverse direction to act on the contact system. Such a switch has a narrow design and is therefore suitable for use in confined spaces. Further embodiments of the invention are the subject of the dependent claims.

hi another embodiment, a spring is arranged on the slide, which may be a kind of horizontal compression spring. With the help of this spring, a negative force-displacement curve is generated when switching the contact system. This results in a high initial force and a low holding-end force on the plunger or on the actuator. Advantageously, the user feels when switching on the power tool a significant pressure point, while due to the low holding end force fatigue-free continuous operation of the power tool for the user is possible. In a compact design, the spring is in a chamber-like receptacle on the slider. The spring is on the side of the chamber associated with the contact system held by a fixed stop, whereby the slide is moved upon actuation of the actuator against the force of the spring.

The contact system comprises a fixed contact and a cooperating, on a contact bearing movably arranged switching contact. The switching contact can be configured as a pivotable rocker with two lever arms. The actuator acts via an actuator by means of a lug on the two lever arms for pivoting the switch contact. Conveniently, the actuator is on the slide, on the side facing away from the plunger, arranged.

In a slimline development, the joint between the plunger and the slider is designed as a fork with a handle. The fork is rotatably supported by pins on the plunger, and the stem is in turn mounted by means of a pin rotatably mounted on the slide. In a particularly easy to assemble configuration, the hinge, in particular the pins of the joint, consist of a first plastic and the plunger and / or the slide of a second plastic, wherein the two plastics do not connect with each other. The joint between the plunger and the slide can then be made by assembly spraying essentially in one operation. For this purpose, the two mutually incompatible plastics are injected into the injection mold for the joint as well as for the plunger and / or the slide simultaneously or sequentially.

In summary, it can be found for a particularly preferred embodiment that a montagegespritzte deflection of the actuating movement is created. With appropriately designed springs, a negative force-displacement curve is generated when switching on.

In the switch according to the invention, the locking member consists of a plastic web. The fact that the previously used metal bolt is replaced accordingly, a more cost-effective solution for the particular combined switch-lock and / or locking is created. Further embodiments of the invention are the subject of the dependent claims. In an expedient and assembly-simplifying configuration of the plastic web is integrally molded on the actuator during its manufacture substantially in one operation. For the sake of simplicity, the plastic web may consist of the same plastic as the actuating member.

In addition to the switch-on lock may be arranged for the locking member on the Einschaltsperreinrichtung. This is designed such that the locking member is inserted in the actuated position of the actuator in the lock insertable and in the lock. The plastic web according to the invention is thus suitable both for switch-on and for locking.

Conveniently, the actuator is pivotally and slidably disposed on the housing at one end. At the other end, the actuator engages over the Einschaltsperreinrichtung in the manner of a hollow cap. It is then advisable that the plastic web is molded on both sides of the inner walls of the hollow actuator.

In summary, it can be seen for a particularly preferred embodiment that a replacement for the previously used metal bolt is made by a plastic web.

The advantages achieved by the invention are in particular that more heat is absorbed by the thickening of the heat sink in the region of the power semiconductor in the blocking case and subtracted from the power semiconductor. Due to the larger cross section, significantly more heat can be transported away and forwarded to the area of the cooling air flow even in the case of continuous load. This allows a lower specified and much cheaper power semiconductor can be used. This also results in a cost savings. In addition, the reliability of the control unit and / or the switch is improved by the improved dissipation of heat loss.

The advantages achieved by the invention are in particular that a cost-effective contact system is created. This is how two-pole switches become two Pressure and / or tension and / or leaf springs for generating the contact pressure saved together with assembly. The contact system opens and / or closes independently of the actuation speed. The contact force is built up immediately after closing. The direct connection to the electronic circuit board saves installation space in the switch. Additional connecting elements, such as contact springs, between the mechanical contact system and the electronics thereby eliminated. The contact system may have a sliding effect, so that the contact system is equipped with a forced tear. Slightly welded contacts can thus be more easily torn off and / or released by a movement transversely to the closing direction.

The advantages also achieved with the invention are in particular that a favorable force-displacement characteristic is given to the actuator. The generation of a low holding force on the actuator counteracts fatigue of the operator. The low holding force reduces the likelihood that the user inadvertently gets close to the switch-off point during fatigue. In addition, advantageously, a higher turn-on force is necessary. Such a negative force-displacement curve, in which the initial force is higher than the final force, ensures that the switch-on is usually carried out in one go to the end position. The deflection mechanism from vertical to horizontal movement, which can be realized by means of three movably molded parts, together with the associated compression springs, enables the desired force characteristic.

The finally achieved with the invention advantages are in particular that a cost saving is given by the elimination of the bolt and a shortening of the assembly times.

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

1 shows an electrical switch in a perspective overall view, 2 shows the heat sink of the switch of FIG. 1 as an individual part in a perspective view, FIG.

3 shows the contact system of the switch of FIG. 1,

Fig. 4 shows the embodiment of the deflection of the actuating movement for the switch and

Fig. 5 is a Einschaltsperreinrichtung for the actuator of the switch.

In Fig. 1, an electrical switch 1 is shown, which is suitable for use for an electric hand tool with an electric motor, such as for a cordless and / or mains power tool. The electric tools can be, for example, drills, grinders, saws, planers, angle grinders or the like. In particular, the switch 1 is suitable for use in the handle of a two-hand angle grinder. The switch 1 has a housing 2 for receiving a movable switching contact 8 and a fixed contact 9 comprehensive contact system 7 (see FIG. 3). On the housing 2, a manually movable by the user by pivoting actuator 3 is arranged. The actuator 3 acts in its operation on the switching contact 8 for switching the contact system 7, so that the power tool by means of the actuator 3 on and / or off. On the housing 2 are still electrical connections 4 for connecting the switch 1 to a power source and electrical connections 5 for connecting the switch 1 to the electric motor.

Finally, located in the housing 2 is an electrical circuit arrangement for controlling and / or regulating the electric motor. The circuit arrangement serves as control electronics for speed variation of the electric motor. For this purpose, the circuit arrangement at least one associated, heat-generating power component 10 (see FIG. 2), such as a power semiconductor, a power transistor, a MOS-FET, a triac o. The like., On, whereby a corresponding control and / or regulation by the Power component 10 to the electric motor flowing electrical load current occurs. In order to dissipate the loss of heat arising during operation of the power tool from the housing 2, the heat-generating power component 10 and / or at least parts of the circuit arrangement with a heat sink 6 located at least partially on the outside of the housing 2 in heat-conducting connection. As is apparent from Fig. 2, the heat sink 6 at least two regions 11, 12, which are arranged approximately in the shape of a U's. The first region 11 of the heat sink 6 is arranged in the housing 2 such that the heat-generating component 10 and / or at least parts of the circuit arrangement are fastened to the first region 11 in heat-conducting connection and thus are in direct connection with the first region 11. The second region 12 of the heat sink 6 protrudes from the housing 2 in the manner of a discharge on both sides of the housing 2, as can be seen with reference to FIG.

As already mentioned, the switch 1 is arranged in the handle of the power tool having a power tool housing. The second region 12 of the heat sink 6 extends into the region of the cooling air flow for the power tool, which serves to cool the electric motor. As a result of this continuation 12 'of the second region 12, the cooling air flow thus simultaneously serves to cool the switch 1. As can be seen further from FIG. 2, the cooling body 6 is stepped in terms of its thickness. Thus, the first region 11 of the heat sink 6 is provided in the region of the power component 10 with a higher material thickness dl. The material thickness d2 in the second region 12, 12 'is correspondingly lower. As a result, an improved heat dissipation is achieved, especially in the critical region of the power component 10, where a large heat loss occurs. A part of the second region 12 'of the heat sink 6 is designed wing-like, so that this protrudes in a better and adapted manner in the cooling air flow for the power tool. As can be seen from FIG. 1, the wing-like second region 12 'is arranged on the front side of the heat sink 6. In addition, other parts of the second region 12 "can be designed in the manner of a wing, these further vanes 12" being located on the front upper side of the heat sink 6. As a result, the utilization of the cooling air flow for heat dissipation can be further optimized. The second region 12 'of the heat sink 6 is provided with slots 13, apertures, openings o. The like. To increase the surface and / or facilitate the air flow for the passage of air. In other words, it is is a stepped heat sink 6, which is thickened in the region of the triac 10 and has vents 13 on the front wings 12 '.

As can be seen with reference to FIG. 2, the second region 12 is angled with respect to the first region 11 at an edge 32. This bend 32 is shown in FIG. 1 at the outlet of the heat sink 6 from the housing 2. The bend 32 is approximately 90 °, so that the second region 12 then rests against the respective wall of the housing 2. As can further be seen in FIG. 1, the heat sink 6 is fastened to the housing 2 by means of latching and / or snap connections 33 for the second region 12.

The housing 2 for the switch 1 comprises a base 34 and a cover 35. The heat sink 6 is secured by means of latching and / or snap connections 33 on the base 34. Next, the lid 35 is secured by means of latching and / or snap connections 36 on the base 34. The second region 12 of the heat sink 6 has a recess 54 for receiving the latching and / or snap connection 36 between the cover 35 and the base 34.

As already mentioned, the wings 12 ', 12 "protrude into the cooling air flow in an adapted manner in accordance with the conditions in the power tool housing, for which the wing-like second region 12', 12" is designed to be angled away from the remaining second region 12, as shown in FIG. The angle between the regions 12, 12 'and / or the regions 12, 12 "is between 90 ° and 170 ° .When using a two-hand angle grinder switch, an angle of approximately 120 ° has proved to be particularly optimal Heat dissipation even when the second wing-like region 12 ', 12 "projects beyond the housing 2. A further optimization of the heat dissipation can finally be achieved by the wing-like second portion 12 'is at least partially provided with a higher material thickness d3, as shown in Fig. 2 can be seen.

The heat sink 6 is designed largely in one piece as shown in FIG. Such a heat sink 6 can be made of a milled or rolled sheet metal strip made of copper, aluminum, steel o. The like. In the manner of a stamped and bent part. The areas with Higher material thickness dl, d3 on the heat sink 6 can be prepared by plating, welding, soldering o. The like. Of the other material.

The contact system 7 for the switch 1 can be seen in more detail in FIG. The actuator 3 cooperates with an actuator 17 for switching the contact system 7, as will be explained in more detail below. The movable by means of the actuator 17 via a projection 18 switching contact 8 is pivotally mounted on a contact bearing 14. The contact bearing 14 is designed as a resilient bearing, so that the contact force is generated by the spring force of the contact bearing 14 itself. Thus, the otherwise usual, standing with the switching contact 8 in cooperation compression spring or leaf spring can be eliminated. To produce the spring force, the contact bearing 14 has an approximately U-shaped configured portion 15.

In the housing 2 is a circuit board 16, which serves to receive electrical and / or electronic components for the control and / or control electronics for the power tool. The U-shaped portion 15 is arranged approximately parallel to the circuit board 16 and the contact bearing 14 is soldered with its U-shaped portion 15 directly to the circuit board 16. For this purpose, one leg 37 of the U-shaped portion 15 is inserted by means of at least one protruding plug foot 39 on the circuit board 16. The leg 37 is then soldered to the plug-in foot 39 with the circuit board 16.

Another leg 38 of the U-shaped section 15, which is opposite to the one leg 37, has a bearing surface 40 projecting approximately perpendicularly from the further leg 38. The bearing surface 40 adjoins the end of the further leg 38 of the U-shaped portion 15 and consists of a folded about 180 ° portion of the other leg 38. The switching contact 8 is designed as a pivotable rocker with two lever arms 41, 42. The switching contact 8 has a bulge 43 between the lever arms 41, 42 for pivotal mounting of the rocker on the bearing surface 40. The actuator 3 then acts on the actuator 17 by means of the projection 18 on the two lever arms 41, 42 for pivoting the switch contact 8 a. In this case, furthermore, the actuating member 3 cooperates via a sliding surface 19 on the actuating member 17 with the switching contact 8 such that a sliding movement for the switching contact. 8 is generated transversely to the Öffimngs- and / or closing movement when switching the contact system 7. Due to this sliding movement, a kind of forced tear for the switching contact 8 is effected, so as to counteract welding of the contacts 8, 9. In summary, it should be noted that a contact system 7 is provided with resilient bearing 14, wherein the resilient bearing 14 generates the force to open and / or close the contacts 8, 9, and wherein a forced tear takes place via the sliding movement.

Finally, a busbar 44 is disposed outgoing from the one leg 37 of the U-shaped portion 15, which as an electrical connection to the protruding from the housing 2 electrical terminal 5 (see Fig. 1), to a solder joint on the circuit board 16 not shown o. The like. Serves. The busbar 44 is approximately perpendicular from the one leg 37 of the U-shaped portion 15 from. Expediently, the busbar 44 and / or the U-shaped section 15 and / or the bearing surface 40 and / or the plug-in foot 39 are designed in one piece in the manner of a stamped and bent part. The thus configured in the manner of a multifunctional contact bearing 14 may consist of copper, copper beryllium o. The like. Exist.

In Fig. 4 is closer to the embodiment for switching action of the actuator 3 to see the contact system 7. For this purpose, the actuator 3 acts during its operation by the user first on a direction of arrow 30 substantially vertically movable plunger 20 a. The plunger 20 is articulated by means of a joint 21 to a direction of arrow 31 substantially horizontally movable slide 22. The slider 22 is the actuator 17, and that on the side facing away from the plunger 20, so that the slider 22 acts on the contact system 7 for switching by the movement of the actuator 3 is deflected approximately in the transverse direction for acting on the contact system 7 ,

On the slider 22, a spring 23 is arranged in the manner of a horizontal compression spring. As a result, a negative force-displacement characteristic when switching on the contact system 7 can be generated. This means that there is a high initial force and a low holding end force on the plunger 20 and on the actuating member 3. The spring 23 is located in a chamber-like receptacle 45 on the slider 22 and is on the contact system. 7 associated side of the chamber 45 held by a fixed stop 46. As a result, the slider 22 is then moved against the force of the spring 23 when the actuating member 3 is actuated. The joint 21 between the plunger 20 and the slider 22 is configured as a fork 47 with a handle 48. The fork 47 is rotatably supported by means of pins 49 on the plunger 20 and the handle 48 is rotatably mounted on the slider 22 by means of a pin 50.

The movable joint 21 between the plunger 20 and the slider 22 is made in a simple manner by mounting spraying substantially in one operation. For this purpose, there are the joint 21, in particular the pins 49, 50 of the joint 21, of a first plastic and the plunger 20 and / or the slide 22 of a second plastic, wherein the two plastics do not connect with each other. For assembly spraying, the two plastics which do not connect to one another are then injected simultaneously or successively into the injection mold for the joint 21 and for the tappet 20 and / or the slide 22.

The deflection of the actuating movement from a vertical to a horizontal movement contributes together with the horizontal compression spring 23 for generating the high initial force and low holding force. In addition, this provides a slim switch 1, which is particularly suitable for use in the handle of a two-hand angle grinder.

As can be seen from Fig. 1, the switch 1 is equipped with a Einschaltsperreinrichtung 24 for the actuator 3. The Einschaltsperreinrichtung 24, which can be seen in detail in detail in Fig. 5, comprises a ramp member 25 on the housing 2 and a locking member 26 on the actuator 3. The Einschaltsperreinrichtung 24 acts such that the actuator 3 in approximately transverse to the actuation direction according to arrow 27 for Overcoming the Einschaltsperreinrichtung 24, in particular of the casserole member 25, ie in the direction of arrow 28 is displaced. For this purpose, the actuating member 3 at the one end 52 (see FIG. 1) is arranged pivotably and displaceably on the housing 2. For interaction with the Einschaltsperreinrichtung 24, the actuating member 3 engages in the manner of a hollow Cap on the other end 53, the Einschaltsperreinrichtung 24, as can be seen particularly well in Fig. 5. In addition, the locking member 26 can be inserted in the actuated position of the actuator 3 in a corresponding lock 29, which is also arranged on the Einschaltsperreinrichtung 24, whereby the actuator 3 is held in the lock 29 for the continuous operation of the power tool.

The locking member 26 consists of a plastic web, which replaced the previously used metal bolt and easier assembly is achieved. The plastic web 26 is made of the same plastic as the actuator 3 and is molded on the actuator 3, and that is the plastic web 26 molded on both sides of the inner walls 51 of the hollow actuator 3. For this purpose, the Sperrkulisse for the Einschaltsperre 24 and the lock 29 is also adapted accordingly.

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 can not only be used with power tool switches, but can also be found on other switches, such as those for household electrical appliances, electrical gardening equipment, machine tools o. The like., Use. Likewise, the invention can also control devices with or without housing, for example, for the power electronics of the power tool, for motor vehicles o. The like., Use.

Reference numeral list:

: electrical switch: housing: actuator (of switch), 5: electrical connection (on switch): heat sink: contact system: switch contact / contact: fixed contact / contact 0: power component / component / triac 1: (first) area (of the heat sink) 2 : (second) area (of the heatsink) 2 ': continued / second area / wing2 ": second area / (further) wings3: (ventilation) slot 4: contact bearing / resilient bearing 5: U-shaped portion (of contact bearing) 6: PCB 7: Actuator 8: Lug (to Actuator) 9: Sliding Surface 0: Push Rod 1: Joint: Slider 3: (Pressure) Spring: Activation Lockout / Lockout5: Bail Out 6: Locking Member / Plastic Stay 7,28: Arrow 9: Locking, 31: arrow : Edge / Angling: Snap-in and / or snap fit (for heatsink): Socket (of body): Lid (of body): Snap and / or snap fit (for lid): Leg (of U-shaped section): (further ) Leg (from U-shaped section): Foot: bearing surface (from contact bearing), 42: lever arm (from switching contact): Bulging: busbar: intake (on slide) / chamber: stop: fork (from joint): stem (from joint ), 50: Pins: Inner wall (of actuator): End (of actuator): (Other) End (of actuator): Recess (in the heat sink)

Claims

Patent claim:

1. Control device, in particular electrical switch (1) for use for an electric tool with an electric motor, such as a cordless and / or power tool, such as drills, grinder, saws, planer, angle grinder o. The like., With a housing ( 2) for receiving at least one heat-generating component (10), such as a power transistor, a MOS-FET, a triac o. The like., In particular in an electrical circuit arrangement, for example, for controlling and / or regulating the electric motor by appropriate control and / or regulating the electrical load current flowing through the component (10) to the electric motor, the heat-generating component (10) and / or at least parts of the circuit arrangement having a heat sink (6) located on the outside of the housing (2) Connection are, characterized in that the cooling body (6) has at least two regions (11, 12) that the first Ber eich (11) of the heat sink (6) in the housing (2) is arranged such that the heat-generating component (10) and / or at least parts of the circuit arrangement are in direct heat-conducting connection with the first region (11), and that the second region (12) of the heat sink (6) from the housing (2), in particular in the manner of a two-sided lateral exit from the housing (2) protrudes.

2. Control device according to claim 1, characterized in that the switch (1) is arranged in a power tool with a power tool housing, in particular in the handle, and that preferably the second region (12) of the heat sink (6) into the area the cooling air flow for the power tool, in particular for the electric motor, extends.

3. Control device according to claim 1 or 2, characterized in that the cooling body (6) is designed stepped in terms of its thickness, and that preferably the first region (11) of the heat sink (6), in particular in the region of the power component (10). , provided with a higher material thickness.

4. Control device according to claim 1, 2 or 3, characterized in that a part of the second region (12 ', 12 ") of the heat sink (6) is designed like a wing, that preferably the wing-like second region (12', 12") in protrudes the cooling air flow for the power tool, and that further preferably the wing-like second portion (12 ') of the heat sink (6) with slots (13), openings, openings o. The like. For the air passage to increase the surface and / or facilitate the air flow is provided.

5. Control device according to one of claims 1 to 4, characterized in that the second region (12) at the outlet from the housing (2) with respect to the first region (11) is angled, preferably that the angled portion (32) in approximately 90 °, that more preferably the second region (12) on the wall of the housing (2) is present, and that still more preferably the heat sink (6), in particular by means of latching and / or snap connections (33) for the second region ( 12) is attached to the housing (2).

6. Control device according to one of claims 1 to 5, characterized in that the housing (2) has a base (34) and a cover (35), that preferably the heat sink (6) is fixed to the base (34), and that Further preferably, the lid (35) by means of latching and / or snap-on connections (36) is fixed to the base (34), wherein in particular the second region (12) of the heat sink (6) has a recess (54) for the latching and / or Schanppverbindung (36) between the lid (35) and base (34).

7. Control device according to one of claims 1 to 6, characterized in that the wing-like second region (12 ', 12 ") protrudes at an angle from the remaining second region (12) that preferably the angle between the regions (12, 12') and / or the regions (12, 12 ") between 90 ° and 170 °, in particular about 120 °, and that further preferably the wing-like second region (12 ') is at least partially provided with a higher material thickness.

8. Control device according to one of claims 1 to 7, characterized in that the cooling body (6) is made substantially in one piece, in particular in the manner of a stamped and bent sheet metal strip from a milled and formed, is formed Preferably, the region of higher material thickness on the heat sink (6) by plating, welding, soldering o. The like. Made, and that further preferably the heat sink (6) made of copper, aluminum, steel o. The like.

9. Control device according to one of claims 1 to 8, characterized in that the second wing-like region (12 ', 12 ") projects beyond the housing (2).

10. Electrical switch, in particular for a power tool with an electric motor, such as a cordless and / or power tool, such as drills, grinders, saws, planer, angle grinder o. The like., With a housing (2), with a housing (2) located contact system (7) comprising a fixed contact (9) and a cooperating, on a contact bearing (14) movably arranged switching contact (8), and with an actuating member (3) for switching action on the contact system (7) , characterized in that the contact bearing (14) is designed as a resilient bearing, in particular such that the contact force of the spring force of the contact bearing (14) is generated.

11. Electrical switch according to claim 10, characterized in that in the housing (2) is a printed circuit board (16) for receiving electrical and / or electronic components is located, in particular for a control and / or control electronics for the power tool, and that preferably the contact bearing (14) is soldered directly to the printed circuit board (16).

12. Electrical switch according to claim 10 or 11, characterized in that the contact bearing (14) has an approximately U-shaped configured portion (15) for generating the spring force, that preferably the U-shaped portion is arranged approximately parallel to the circuit board in that, furthermore, preferably one leg of the U-shaped section (15) is pushed onto the printed circuit board by means of at least one projecting plug foot, and that even more preferably the leg, in particular at the plug foot, is soldered to the printed circuit board.

13. Electrical switch according to claim 10, 11 or 12, characterized in that a leg opposite one of the other leg of the U-shaped portion (15) has a protruding approximately perpendicularly from the other leg bearing surface, preferably that the bearing surface at the end of further leg of the U-shaped section (15) connects, and that further preferably, the bearing surface consists of a folded about 180 ° portion of the other leg.

14. Electrical switch according to one of claims 10 to 13, characterized in that the switching contact is designed as a pivotable rocker with two lever arms, that preferably the switching contact has a bulge between the lever arms for pivotal mounting of the rocker on the bearing surface, and more preferably the actuator via an actuator by means of a lug on the two lever arms to pivot the switch contact acts.

15. Electrical switch according to one of claims 10 to 14, characterized in that the switching contact (8) with the actuating member (3) cooperates, that a sliding movement across the Öffhungs- and / or closing movement of the switch contact for a kind of forced demolition is effected ,

16. Electrical switch according to one of claims 10 to 15, characterized in that a busbar from one leg of the U-shaped portion as electrical connection to a projecting out of the housing electrical connection to a solder connection on the circuit board o. The like. Is arranged in that the busbar preferably protrudes approximately perpendicularly from one leg of the U-shaped section, and more preferably that the busbar and / or the U-shaped section and / or the bearing surface and / or the plug-in foot are in one piece, in particular in the manner of a stamped and bent part , are designed.

17. Electrical switch according to one of claims 10 to 16, characterized in that the contact bearing of copper, copper beryllium o. The like. Is.

18. Electrical switch, in particular for a power tool with an electric motor, such as a cordless and / or power tool, such as drills, grinders, saws, planer, angle grinder o. The like., With a housing (2), with a housing (2) located contact system (7), and with an actuating member (3) for switching action on the contact system (7), characterized in that the actuating member (3) acts on a substantially vertically movable plunger (20) that the plunger (20) is articulated to a substantially horizontally movable slide (22), and that the slide (22) acts on the contact system (7) for switching, so that the movement of the actuating member (3) approximately in the transverse direction for acting on the Contact system (7) is deflected.

19. An electrical switch according to claim 18, characterized in that on the slide (22) is arranged a spring (23), in particular in the manner of a horizontal compression spring, such that a negative force-displacement characteristic when switching the contact system (7). is produced, that preferably the spring (23) is located in a chamber-like receptacle on the slide, and further preferably that the spring (23) is fixed to the contact system associated side of the chamber by means of a fixed stop, such that the slide when operating the Actuator is moved against the force of the spring.

20. Electrical switch according to claim 18 or 19, characterized in that the contact system comprises a fixed contact and a cooperating, on a contact bearing movably arranged switching contact, that preferably the switching contact is designed as a pivotable rocker with two lever arms that preferably the actuator over an actuator by means of a lug on the two lever arms for pivoting the switch contact acts, and that further preferably the actuator is arranged on the slide, in particular on its side facing away from the plunger.

21. Electrical switch according to claim 18, 19 or 20, characterized in that the joint (21) between the plunger (20) and the slide (22) is designed as a fork with a handle, that preferably the fork rotatable by means of pins on Ram stored is, and further preferably that the stem is rotatably mounted on the slider by means of a pin.

22. Electrical switch according to one of claims 18 to 21, characterized in that the joint, in particular the pins of the joint, consist of a first plastic and the plunger and / or the slide of a second plastic, wherein the two plastics are not mutually connect, and that the joint (21) is made by assembly spraying substantially in one operation by the two mutually non-bonding plastics are injected simultaneously or sequentially in the injection mold for the joint (21) and for the plunger and / or the slide ,

23. Electrical switch, in particular for a power tool with an electric motor, such as a cordless and / or power tool, such as drills, grinders, saws, planer, angle grinder o. The like., With a housing (2), with a housing (2) located contact system (7), with a movable in an actuating direction actuator (3) for switching action on the contact system (7), and with Einschaltsperreinrichtung (24) for the actuator (3), wherein the Einschaltsperreinrichtung (24) a Casserole member (25) on the housing (2) and a locking member (26) on the actuating member (3), such that the actuating member (3) in approximately transversely to the operating direction to overcome the Einschaltsperreinrichtung (24), in particular of the casserole member (25) displaceable is, characterized in that the locking member (26) consists of a plastic web.

24. An electrical switch according to claim 23, characterized in that the plastic web (26) is molded on the actuating member (3) during its manufacture substantially in one operation, and that preferably the plastic web consists of the same plastic as the actuator.

25. An electrical switch according to claim 23 or 24, characterized in that a detent (29) on the Einschaltsperre (24) for the locking member (26) is arranged, such that the locking member (26) in the actuated position of the actuator in the lock einfuhrbar and is held in the lock.

26. An electrical switch according to claim 23, 24 or 25, characterized in that the actuating member at one end pivotally and slidably disposed on the housing, that preferably the actuator in the manner of a hollow cap at the other end engages over the Einschaltsperreinrichtung, and that Further preferably, the plastic web is molded on both sides of the inner walls of the hollow actuator.