Electric ceiling fan

Details Electric ceiling fan Electric ceiling fan

1989-11-09

1991-10-08

Tapolcai, William E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

416 79, F03D 506

Patent

active

050543768

ABSTRACT:
An assembly can be anchored on a ceiling or a beam and includes a motor, preferably electrical, and a velocity demultiplexer formed by pulleys or by gear systems which transmits the motor driving force to an arm or arms of a fan member which has an axis common with that of the outlet of the demultiplexer. The movement of the motor is controlled by an electronic circuit which emulates manual impulsion, taking advantage of the natural frequency of oscillation of the pendulum which is formed by the mass of the fan member when it is suspended from an axle.

REFERENCES:
patent: 114491 (1871-05-01), Thompson
patent: 189793 (1877-04-01), Schmidt
patent: 198798 (1878-01-01), Elkins et al.
patent: 250165 (1894-01-01), Carr
patent: 526929 (1896-10-01), Mackie
patent: 707040 (1902-08-01), Warlick
patent: 732363 (1903-06-01), Marak
patent: 753687 (1904-03-01), Earl
patent: 1707387 (1929-04-01), Cline

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