Patent ID: 7990005

Claim:
A power tool, comprising: a motor; a controller; a motor and controller housing, said motor and said controller disposed within said motor and controller housing; a first end plate; a second end plate; said first end plate and said second end plate sealingly coupled with respective ends of said motor and controller housing to prevent the intrusion of liquids and gasses; a switch selectively controlling energy to said controller; the exterior of said motor and controller housing having at least one fin for conducting heat from an interior of said housing to the exterior of said motor and controller housing; power transmission structure operatively coupled with said motor; a handle operatively coupled with said motor and controller housing; and an outer casing comprising at least one wall enclosing and contacting said at least one fin and cooperating with said at least one fin to define at least one air passage between said motor and controller housing and said at least one wall; wherein said motor and controller housing has multiple fins for conducting heat, said fins are of varying length, and said wall is held in contact with said fins by portions of said motor and controller housing, thereby creating conduits through which a cooling fluid is conducted thereby improving the removal of heat from said motor and controller housing.