Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2008-01-29
2008-01-29
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S047000
Reexamination Certificate
active
11191253
ABSTRACT:
It is an object of the invention to provide an effective technique for making compact power tool having an electric motor. A representative power tool may include a tool bit, housing and an electric motor. The electric motor is housed in the housing and drives the tool bit. The electric motor includes an output shaft, a commutator, an armature, brushes, brush holders, a brush holder base, a cooling fan and a cooling-fan facing surface. The cooling-fan facing surface is formed on the brush holder base. The cooling-fan facing surface faces the cooling fan and extends flat in the centrifugal direction to guide the discharged cooling air from the cooling fan in the centrifugal direction. Because the brush holder base not only secures the brush holder but also smoothly guides the cooling air by means of the cooling-fan facing surface, the size of the electric motor in the axial direction of the output shaft can be reduced.
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JP laid-open publication of utility model No. 57-111068.
Furui Nobuyasu
Yoshikawa Shuji
Makita Corporation
Nguyen Tran
Orrick Herrington & Sutcliffe LLP
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