Patent ID: 9132542
Filing Date: 2015-09-15
Classification: B25F,Y10T

Abstract:
1. A power tool comprising: a handle having a first end, a second end, and an air current channel formed between the first and second ends; an enclosure at the first end of said handle and having a plurality of through holes; a battery disposed in said enclosure; a shell connected to the second end of said handle, in communication with the air current channel in said handle, and having an air inlet and an air outlet; a chuck connected to the shell, the air inlet located closer to the chuck than the air outlet; a motor in said shell having a first end and a second end opposite to each other, the second end of said motor located closer to the air inlet of the shell than the first end of said motor, the air outlet being disposed between the air inlet and the first end of the motor; and an impeller mounted to an axle of said motor and disposed between the first and second ends of said motor, the impeller having a first axial end and a second axial end opposite to each other, and a plurality of vanes between said first and second axial ends, the vanes radially facing the outlet of the shell, wherein the plurality of vanes of said impeller rotating with the axle of said motor generates a first air current entering said enclosure via the plurality of through holes, past said battery and the air current channel in said handle, flowing through the first end of said motor in said shell, reaching the impeller from the first axial end thereof, and exiting said shell via the air outlet, and a second air current entering said shell via the air inlet, flowing through the second end of said motor, and then reaching the impeller from the second axial end thereof and exiting said shell via the air outlet.