Patent ID: 7320542

Claim:
A blender comprising: a base frame including a hollow column in a central portion thereof, defining a compartment, a perimeter wall surrounding the hollow column, defining a space between the perimeter wall and the hollow column, the hollow column including an opening in a bottom end thereof, the perimeter wall including two opposite sides each having a plurality of slots, each of said opposite sides including a recessed portion for guiding air out of the base frame, two separating plates extending downward from the bottom end of the base frame and facing the opposite sides, respectively, a notch being defined in the perimeter wall and not aligned with the slots, an air-guiding groove being provided between the notch and the opening; a cover for covering the base frame; a muffler housing mounted to the bottom end of the base frame and including a plurality of apertures communicated with the opening of the base frame for guiding air; a motor received in the compartment of the hollow column, the motor including an upper drive shaft adapted to drive a mixing blade means and a lower drive shaft; and a fan driven by the lower drive shaft for driving ambient cool air into the compartment of the hollow column via the notch, the air-guiding groove, the apertures, thereby directly cooling the motor, with hot air exiting the blender after passing through the compartment, the space, the slots, and the recessed portions of the base frame, and with the separating plates preventing the hot air from entering the blender.