Patent ID: 6533548
Filing Date: 2003-03-18
Classification: F04D

Abstract:
An electric fan comprising:a motor; a U-shaped brace pivotably secured to the opposite sides of the motor, the brace including an upright extended downwardly from the bottom center of the brace, a collar secured to the lower portion of the upright by a first pin, a rearwardly extended projection, and a first stud on the end of the projection inserted into a first hole of a linking member; a support including a second hole for receiving the upright, the support being secured in a first recess on the top of an upwardly projecting upright portion; a torsion spring anchored in a second recess on the outer surface of the support, the torsion spring having one end anchored in a first aperture of the support and other end anchored in a first through hole of the upwardly projecting upright portion; a guide mechanism pivotably secured to the support, the guide mechanism including an elongate plate member having an opening; a pair of depressible spring detents operable to be engaged with one of a plurality of indents in the bottom of the support; a first lever operable to adjust the angle of the fan with respect to the upwardly projecting upright portion; a transmission mechanism including a downward second pin having an upper portion secured to a first arm coupled to a transmission shaft rotatably secured to the motor, the second pin being inserted into and slidable back and forth along the opening; a lower section including a transverse hole with a drive shaft of the motor inserted through, a first seat, a gear seat, a second through hole, a first gear on the second through hole, a first trough having a half circular cross-section, a second seat, and a gear trough; a cover member including a third hole, a second truncated cone, a third recess in the top of the truncated cone, a fourth hole, a second trough having a half circular cross-section mating to the first trough, and a fifth hole; a transverse and a vertical hollow cylindrical members each including a second truncated cone, an upper recess, a lower recess having the diameter as the lower recess, two opposite protrusions, and a bolt having the lower end threadedly secured to the head of the transverse post; a second lever in the transverse hollow cylindrical members having one end put on the transverse hollow cylindrical members; a transverse post between the second recess and second hole, the transverse post including a downwardly tapered portion on the upper part of the transverse post, a second gear in the central portion meshed to a worm gear of the drive shaft, and a third gear in the lower part mesh with the gear of the first arm; a vertical post between the second recess and the second hole, the vertical post including a third truncated cone in the upper part a first bevel gear, a fourth recess coupled to the first bevel gear, a second bevel gear meshed with the first bevel gear, a second stud coupled between the first arm and the linking member; a lower sleeve is put on the vertical post being urged by a lower shoulder; and an upper sleeve put on the vertical post between the lower part of the second bevel gear and the upper part of the third gear, wherein the transverse and the vertical post both move up when the transverse and the vertical hollow cylindrical members move up to cause one of the detent to clear from the rotating second gear and the other detent to move into the third recess to mesh with the second gear such that the first arm is rotated by the first bevel gear, thereby emabling the brace to move longitudinally reciprocally by the cooperation of the linking member; the transverse post moves down when the transverse and the vertical hollow cylindrical members move up to cause one of the detents to clear from the rotating second gear and the second pin rotates eccentrically, thereby enabling the brace to move transversely reciprocally; or the transverse post moves down and the vertical post moves up when the transverse and the vertical hollow cylindrical members move down to cause the detents move into the first gear and the second gear respectively to mesh therewith, thereby enabling the fan to move in a wavy path due to the combination effect of transversely reciprocally and longitudinally reciprocally moving thereof.