Electric switch, especially for electric hand tools

Details Electric switch, especially for electric hand tools Electric switch, especially for electric hand tools

1996-03-12

1998-08-25

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 64, H05K 720, H05K 500

Patent

active

057985847

ABSTRACT:
The invention relates to an electric switch (1), especially for use for an electric hand tool having an electric motor, such as a battery-operated electric tool having a direct-current motor. The switch (1) possesses a housing (2) for receiving a contact system, a movable actuating member which acts on at least one switch contact of the contact system, and control electronics (26) located in the housing (2) as well as an associated power semiconductor (28) for varying the rotational speed of the electric motor. The power semiconductor (28) is connected via a current-bearing and heat-conducting carrier part (31) to the contact system located in the housing (2) and, further, is heat-conductively connected to a cooling body (34) located on the outside of the housing (2). The carrier part (31) extends through a wall perforation (33) of the housing (2) at least as far as the cooling body (34). To simplify assembly, the cooling body (34) is held directly on the carrier part (31) non-positively and/or positively without additional fastening means.

REFERENCES:
patent: 4137490 (1979-01-01), Brozoski et al.

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