ELECTRIC MAINS-CONNECTION DEVICE FOR AN ELECTRIC HAND-HELD POWER TOOL

Abstract

An electric mains-connection device for an electric hand-held power tool equipped with an electric motor (M), in particular for an angle grinder, has mains-connection terminals for a mains-connection cable, and with an anti-interference capacitor; it is designed as a mains-connection module that can be actuated externally, includes mains terminals, houses the anti-interference capacitor, and out of which an electric cable extends, which serves to connect motor electronics and a motor switch in an interface-free manner. An electric device for an electric hand-held power tool equipped with an electric motor, in particular for an angle grinder, includes the electric mains-connection device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an electric mains-connection device in accordance with the present invention that is designed as a mains-connection module, in a perspective view;

FIG. 2 shows the same mains-connection module in accordance with the present invention, in an exploded view; and

FIG. 3 shows a wiring diagram for an electric device—depicted using symbols—for an electric hand-held power tool that is equipped with an electric motor in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows an electric mains-connection device 1 for a not-shown electric hand-held power tool, which is designed as a mains-connection module 2. Mains-connection module 2 is composed of a module body 3, which includes a base 4 and a dust cover 5. Dust cover 5 includes recesses 6 that are formed next to each other in the essentially vertical front side 7 of dust cover 5, and which lead into screw openings 8 that are formed next to each other on a top side 9 of dust cover 5. Top side 9 and front side 7 form an angle of essentially 90°. A segment 10 can be located between recesses 6 and screw openings 8 to reinforce dust cover 5.

Dust cover 5 can be designed essentially cuboid in shape or with a stepped design, as in the current case. “Stepped” means that top side 9 is not designed in a plane from front side 7 to a back side 11 opposite thereto, but is designed in two or more planes, and it is possible for the design to pass back and forth between these planes. Mains-connection module 2 also includes housed mains terminals 12 that are located inside dust cover 5 and behind recesses 6. The not-shown mains lines are connected to mains terminals 12 using screws 13 that are screwed into mains terminals 12 and extend out of—and are accessible via—screw openings 8 on top side 9 of dust cover 5.

Leads 14 that are designed as cables 15 also extend out of top side 9 of dust cover 5. The cables are: A motor electronics power supply line VE, a motor electronics lead ZE, and a motor lead ZM. Terminal leads 16 are formed on back side 11 of mains-connection module 2, i.e., a ground line N and snaked-through motor lead ZM′.

“Snaked-through motor lead ZM′” refers to the unbroken continuation of motor lead ZM.

FIG. 2 shows an exploded diagram of mains-connection module 2. Dust cover 5 has been lifted off of base 4 in order to show the position of individual components inside mains-connection module 2. One of the mains terminals 12, which is designed as a motor electronics terminal 17, accommodates motor electronics lead ZE inside mains-connection module 2, while the other connection terminal 12 is designed as an electronics supply terminal 18 that accommodates motor electronics powre supply line VE inside mains-connection module 2. Motor lead ZM snakes through and leads—without interruption—to back side 11 of mains-connection module 2 as snaked-through module lead ZM′. Inside mains-connection module 2, ground line N—which exits mains-connection module 2 on back side 11—extends to electronics power supply terminal 18. Motor electronics power supply line VE exits the same electronics power supply terminal 18, on top side 9 of mains-connection module 2.

Dust cover 5 includes housing chambers 19 for accommodating mains terminals 12, which are formed between front side 7 of dust cover 5 and one of the side walls 20 of dust cover 5 in front-side region 21 of dust cover 5. Inside dust cover 5, housing chambers 19 are bounded by inner walls 22. A capacitor housing chamber 23 is located adjacently thereto, in the direction toward back side 11 of dust cover 5, and it is separated from housing chambers 19 by a partition 24. Capacitor housing chamber 23 accommodates an anti-interference capacitor 25 that, after mains-connection module 2 is closed, i.e., after base 4 and dust cover 5 are joined, is housed entirely in mains-connection module 2.

Anti-interference capacitor 25 includes capacitor connections 26, only one of which is visible, due to the perspective shown. Capacitor connections 26 are designed as connecting wires 27 that are guided out of anti-interference capacitor 25. Connecting wires 27 are inserted into boreholes 28—provided for this purposes—of mains terminals 12, for contacting purposes. Only one borehole 28 is shown here as well, due to the perspective, i.e., the borehole on motor electronics terminal 17. When mains-connection module 2 is assembled, i.e., when base 4 and dust cover 5 are joined after the above-described components are installed, the components are fixed in position securely and distinctly, and the components are positioned relative to each other in a distinct manner.

To provide particularly advantageous protection of the mains-connection module against humidity and to create a very good seal against dust, it is also possible to insert a not-shown casting compound, a synthetic resin in particular, into the interior of mains-connection module 2 upon assembly. This results in a complete casting of mains-connection module 2 and its components contained therein, thereby fixing them in position relative to each other, stabilizing their particular contact position, and sealing them against any type of influences. This also results in excellent electric insulation and very good protection against leakage currents.

FIG. 3 shows, using symbols, an electric device 29 for a not-shown electric hand-held power tool equipped with an electric motor M. Electric motor M is shown only to illustrate the wiring of electric device 29. It is not part of electric device 29. Electric device 29 is composed of schematically depicted mains-connection module 2, a motor switch module 30, and a motor electronics module 31, all of which are connected with each other using an electric cable 32 in an interface-free manner. Mains-connection module 2 includes, in particular, anti-interference capacitor 25. Motor switch module 30 includes a motor switch 33, which is designed as a two-pole break contact 34.

Motor electronics module 31 includes power electronics 35 for regulating the power of electric motor M. Mains-connection module 2 includes mains terminals 12, via which mains-connection module 2 is connected to the electric network, in particular via a not-shown mains-connection cable. Motor electronics lead ZE, motor electronics power supply line VE, and motor lead ZM—which are electric cables 32—extend out of mains-connection module 2, and they all lead into motor electronics module 31. Snaked-through motor lead ZM′ and ground line N also extend out of mains-connection module 2 as electric cables 32, and they lead into motor switch module 30.

Motor connection line MA₁ and motor connection line MA₂ extend out of motor switch module 30 as electric cables 32, and they lead into electric motor M. The electric connection therefore takes place in the sequence: Mains-connection module, motor electronics module, and motor switch module. This means the motor switch module is located after the motor electronics module in the electric current flow. In the case of two-pole separation, this ensures there is no potential at the components that are contacted at the switch output.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the type described above.

While the invention has been illustrated and described as embodied in an electric mains-connection device for an electric hand-held power tool, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

Claims

1. An electric mains-connection device for an electric hand-held power tool provided with an electric motor, the device comprising mains terminals for a mains-connection cable; an anti-interference capacitor, wherein the electric mains-connection device is configured as a mains-connection module, said module including mains-connection terminals actuatable from outside, in which said anti-interference capacitor is housed, and out which an electric cable extends for connecting motor electronics and a motor switch in an interface-free manner.

2. An electric mains-connection device as defined in claim 1, wherein said mains-connection module includes a base, to which a dust cover is assigned.

3. An electric mains-connection device as defined in claim 2; and further comprising housing chambers formed on said dust cover, in which said mains terminals are located.

4. An electric mains-connection device as defined in claim 2, wherein said dust cover includes a capacitor housing chamber in which said anti-interference capacitor is located.

5. An electric mains-connection device as defined in claim 1, wherein said electric cable originates at said motor electronics, snakes through the mains-connection module, and is guided to said motor switch.

6. An electric mains-connection device as defined in claim 1, wherein said mains-connection module is configured as a cast module.

7. An electric mains-connection device as defined in claim 1, wherein said mains-connection module is configured as a module cast with synthetic resin.

8. An electric device for an electric hand-held power tool, comprising an electric mains-connection device having mains terminals for a mains-connection cable, an anti-interference capacitor, wherein the electric mains-connection device is configured as a mains-connection module, said module including mains-connection terminals actuatable from outside, in which said anti-interference capacitor is housed, and out which an electric cable extends for connecting motor electronics and a motor switch in an interface-free manner.

9. An electric device as defined in claim 8, wherein the motor electronics is configured as a motor electronic module, while the motor switch is configured as a motor switch module.

10. An electric device as defined in claim 9, wherein each of said mains-connection module, said motor electronics module, and said motor switch module is configured as a cast module, and said mains-connection module, said motor electronics module and said switch module are connected with each other via said electric cable in an interface-free manner.

11. An electric device as defined in claim 9, wherein said mains-connection module, said motor electronic module, and said motor switch module are configured and arranged so as to provide an electric module switching sequence to said mains-connection module, said motor electronics module, and said motor switch module.