Power tool

Details Power tool Power tool

2008-05-20

2008-05-20

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S154010

Reexamination Certificate

active

07375447

ABSTRACT:
A power tool includes: a stator having a substantially cylindrical yoke and a plurality of permanent magnets that are firmly fixed to an inner surface of the yoke and circumferentially spaced from each other by a first gap; a rotor inserted inside the permanent magnets at a second gap radially; an outer frame portion that accommodates the stator and the rotor; a ventilation hole formed in the outer frame portion to place the first and second gaps in communication with an atmosphere; and a dustproof member comprising a ferromagnetic material, which is mounted in contact with the stator and has a protruding portion located in a passage going from the first and second gaps to the atmosphere via the ventilation hole.

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European Search Report dated Jul. 28, 2005.
Chinese Office Action dated Sep. 29, 2006 with English Translation.

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