US Patent 7553136 Low profile heat dissipating fan

An electric fan includes a stationary assembly and a rotor (40) being rotatable with respect to the stationary assembly. The stationary assembly includes a support member (16) located at a center portion thereof, and a stator (20) mounted around the support member. The rotor includes a blade set (41) having a rotary shaft (412) extending from the blade set toward the stationary assembly and pivotably supported by the support member. A rail assembly consisting of a lower rail (18) and an upper rail (49) is attached to the stationary assembly and the blade set to movably support the rotor on the stationary assembly.