Electrically driven power tool

Details Electrically driven power tool Electrically driven power tool

2007-03-13

2007-03-13

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S050000

Reexamination Certificate

active

11205226

ABSTRACT:
A power tool includes an electric motor (6) located in the tool housing (4) and capable of rotation in both clockwise and counterclockwise directions, a brush carrier (14) carrying at least two brushes (2) that electrically contacts the commutator (12) of the motor (6), an actuation member (26) accessible from outside of the housing (4) for rotating the brush carrier (14) relative to the housing (4) in a circumferential direction (U) of the commutator (12) between clockwise rotational position and counterclockwise rotational position, and a device for preloading the brush carrier (14) in both clockwise and counterclockwise rotational positions and having at least one spring member (32) for biasing the brush carrier (14) both in the circumferential direction (U) and the axial direction of the commutator (12).

REFERENCES:
patent: 4978877 (1990-12-01), Quirijnen
patent: 5955802 (1999-09-01), Karasa et al.
patent: 6930431 (2005-08-01), Buck et al.

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