Patent ID: 6347922
Filing Date: 2002-02-19
Classification: F04D

Abstract:
A portable cooling fan comprising:a plurality of leaf blades that rotate about a single axis of rotation, each of the leaf blades comprising an entire periphery, and upper and lower surfaces, the leaf blades each comprising an indented costa formed substantially along the entire periphery of each of the leaf blades such that the upper surface of each of the leaf blades includes a protruded hollow portion, and the rear surfaces of each of the leaf blades includes an indented hollow portion around the entire periphery of the protruded hollow portion of each of the leaf blades; a frame body within which the leaf blades rotate; a fixing rack comprising a pair of U-shaped reinforcement ribs, which are adjustably attached such that the U-shaped reinforcement ribs extend below the fixing rack; a wheel set rotatively attached to the fixing rack between the pair of the U-shaped reinforcement ribs such that the wheel set contacts a surface below the fan; and a hand grip attached to the frame body at an upper position thereof.