Balancing ring for a ceiling fan

Details Balancing ring for a ceiling fan Balancing ring for a ceiling fan

1999-10-08

2001-04-10

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

Self-shifting or selectively adjustable mass

C415S119000, C416S005000, C416S500000

Reexamination Certificate

active

06213717

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a ceiling fan, more particularly to a balancing ring for a ceiling fan.
2. Description of the Related Art
Referring to
FIG. 1
, in order to maintain balance and prevent swaying of a ceiling fan
1
when the latter operates, it is known in the art to provide a weight
4
on a top surface
3
of each fan blade
2
of the fan
1
. The weight
4
is generally secured on the respective blade
2
with the use of a double-sided adhesive tape
5
. However, it is noted that untimely removal of the weights
4
easily occurs when the blades
2
rotate at a relatively fast speed. In addition, proper installation of the weights
4
cannot be performed without the presence of a skilled technician.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a balancing ring, which can be easily and securely installed on a ceiling fan, to maintain balance and prevent swaying of the fan when the latter operates.
According to this invention, a balancing ring comprises a ring member, a plurality of metal balls, a ball restraining ring, and lifting means.
The ring member has a top side, a bottom side, an inner peripheral wall that confines a central opening, an outer peripheral wall, and an annular groove formed in the top side between the inner and outer peripheral walls. The groove has a groove bottom formed with an annular ball receiving recess.
The metal balls are disposed in the ball receiving recess.
The ball restraining ring is disposed in the groove above the groove bottom, and is movable inside the groove in at least an axial direction of the central opening between a restricting position, where the metal balls are restricted from moving freely, and a releasing position, where the metal balls are free to move in the ball receiving recess.
The lifting means, which is provided in the groove, permits movement of the ball restraining ring in the groove in response to rotating speed of the balancing ring.


REFERENCES:
patent: 3799619 (1974-03-01), LaBarber
patent: 4075909 (1978-02-01), Deakin
patent: 5256037 (1993-10-01), Chatelain
patent: 5593281 (1997-01-01), Tai
patent: 6065368 (2000-05-01), Sohn
patent: 931-970 (1982-05-01), None

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