Patent ID: 7811059

Claim:
Mechanism for varying an oscillating angle of an electric fan comprising: (a) a worm integral with a rear end of a fan motor shaft for translating rotation to a toothed spindle of a clutch and worm gear unit, said toothed spindle meshing with a carrier disk; (b) a gear housing means mounted onto a motor rear housing, and enclosing said clutch and worm gear unit, said gear housing means adapted for mounting a flanged hollow axle member; (c) said hollow axle member having a vertical axis thereof, said axis being common with a cam plate member and said carrier disk; (d) said carrier disk having an easement opening of size through which a crank pin is nested for horizontal swivel, and including plurality of detent holes into which a detent pin may be selectively received; (e) a crank pin and swivel block assembly, with a first end of a swivel block portion thereof rigidly attached with said crank pin, and a second end of said swivel block is strategically connected to an upper side of said carrier disk for horizontal swivel of said crank pin and swivel block assembly toward or away from said vertical axis; (f) said cam plate member disposed with an adjusting rod having an adjusting knob secured to the upper end of said adjusting rod, for actuation of said crank pin towards or away from said vertical axis; said cam plate further disposed with an arcuate through-opening dimensioned to movably accommodate said crank pin, and including said detent pin on the upper side thereof for locking-in any one of said plurality of detent holes on said carrier disk; (g) a rated spring means interposed said adjusting knob and the upper end of said hollow axle for detachably biasing said carrier disk and said cam plate member toward each other and thus keeping a normally locked-in relationship between said detent pin and any of said plurality of detent holes; (h) a swing arm having a first end articulated with a guide pin disposed at an upper portion of a fan stand, and a second end articulated with a crank pin disposed on the carrier disk; (i) said carrier disk mounted for rotation about the bottom end of said flanged hollow axle member.