Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Continuous rotor oscillation
Reexamination Certificate
2001-06-01
2002-12-31
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Continuous rotor oscillation
C416S172000, C416S1700HM
Reexamination Certificate
active
06499951
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a fan head swinging device, particularly to one capable to swing right and left for any angle.
A conventional fan head swinging device shown in
FIGS. 1 and 2
, includes a speed reducer A consisting of plural gears A
0
rotated by a synchronous motor B, the motor B has no carbon brushes, and a coil B
3
powered to excite magnetism to produce a magnetic field to let the rotor B
0
of the motor B to rotate. Then a spindle B
1
is connected to the rotor B
0
, and a gear B
2
is fixed on the spindle B
1
and engages one of the plural gears A
0
of the speed reducer A, causing the head to swing right and left. As the synchronous motor used in the conventional fan has no carbon brushes, which means the excited magnetic field produced between the rotating direction of the rotor B
0
and the coil B
3
has no constant direction. Therefore, the swinging direction of the fan head cannot be controlled as it should be, and the fan head may be liable to swing reverse if it might receive an exterior force. So an outer wind guider C provided in a cool fan shown in
FIG. 3
may change its rotating direction if it is touched. Some traditional fan are provided with a control rod D as shown in
FIG. 4
for controlling the fan head in changing its swinging direction, owing to the disadvantage of the synchronous motor in impossibility to control a fan head in swinging correctly.
SUMMARY OF THE INVENTION
The objective of the invention is to offer a fan head swinging device to swing right and left for any angle correctly.
The feature of the invention is a speed reducer connected to a DC motor capable to control in changing the rotating direction of the motor, and subsequently possible to control accurately the swinging angle of a fan head.
REFERENCES:
patent: 4832576 (1989-05-01), Deguchi et al.
patent: 5720594 (1998-02-01), Snow
patent: 5800126 (1998-09-01), Tsai
patent: 6015262 (2000-01-01), Huang
patent: 6272874 (2001-08-01), Keeney
patent: 62013797 (1987-01-01), None
Lung Huang Chen
Pan Huang Chuan
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