Patent ID: 8123596
Filing Date: 2012-02-28
Classification: B25F

Abstract:
1. A power tool comprising: a casing; a motor disposed within the casing; a first air introduction opening and a second air introduction opening formed in the casing on a first side and a second side opposite to the first side, respectively; and a first air introduction member and a second air introduction member extending inwardly from an inner wall of the casing at positions proximal to the first air introduction opening and the second air introduction opening, respectively; wherein: the first air introduction member is configured such that an external air flowing into an inside of the casing via the first air introduction opening is directed in a first direction within the casing; the second air introduction member is configured such that an external air flowing into inside of the casing via the second air introduction opening is directed in a second direction within the casing; first direction and the second direction are the same with respect to a circumferential direction of the casing; the first and the second air introduction openings are spaced from each other in the circumferential direction of the casing; and the flow of air from the first air introduction opening and the flow of air from the second air introduction opening are merged to produced a spiral flow.