Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Distally supported on radial arm
Reexamination Certificate
2000-12-11
2002-04-02
Ryznic, John E. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Distally supported on radial arm
C416S145000, C416S133000
Reexamination Certificate
active
06364612
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a ceiling fan structure which is able to absorb swinging force and keep the ceiling fan in a balanced state during rotation.
FIGS. 4 and 5
show a conventional ceiling fan composed of a fixing seat
81
, a connecting rod
82
, a housing
83
, multiple vane fixing brackets
84
and multiple vanes
85
. The fixing seat
81
is a semispherical body which is fixed on a ceiling via a locking bracket
811
. The locking bracket
811
has two symmetrical locking sections
812
upward extending therefrom. The connecting rod
82
is connected with bottom face of the fixing seat
81
. The locking bracket
811
has a lateral opening
813
through which the connecting rod
82
is passed for inlaying the fixing seat
81
in the locking bracket
811
. The housing
83
is connected to the other end of the connecting rod
82
. A motor
831
is installed in the housing
83
and enclosed in a motor casing
832
. The periphery of bottom side of the motor casing
832
is connected with multiple vane brackets
84
by multiple bolts
86
. Each vane bracket
84
is pivotally connected with a vane
85
which is radially arranged and centered at the motor
831
.
In general, the vane
85
of the ceiling fan is wood-made. The wood will have slightly different specific weight due to different varieties. Therefore, the vanes
85
of the ceiling fan often have different weights. Accordingly, when assembling the ceiling fan, it is necessary to cautiously select the vanes
85
with the same weight. In the case that the respective vanes
85
mounted on the vane brackets have different weights, during rotation of the ceiling fan, the vanes
85
together with the motor
831
will swing. Under such circumstance, the motor
831
will drive the fixing seat
81
to swing on the locking bracket
811
. As a result, after a period of use, the contacting sections of the fixing seat
81
and the locking bracket
811
will be speedily worn out.
Furthermore, in preliminary use, the ceiling fan can keep in a balanced state. However, after a period of use, the weight of the wooden vanes
85
may change due to humidity in the air. This leads to unbalanced state of the ceiling fan and swinging of the entire ceiling fan during rotation.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a ceiling fan structure in which multiple springs are arranged between the motor casing and the fixing disc. The springs are able to absorb the swinging force exerted onto the vanes during rotation due to different weights of the vanes. Therefore, the ceiling fan can be safely and durably used.
REFERENCES:
patent: 2148524 (1939-02-01), Bsrtch et al.
patent: 2484197 (1949-10-01), Veldhuis
patent: 2995295 (1961-08-01), Day
patent: 3039678 (1962-06-01), Sharpe
patent: 4511310 (1985-04-01), Pearce
patent: 5593281 (1997-01-01), Tai
patent: 5944487 (1999-08-01), Pearce
Rosenberg , Klein & Lee
Ryznic John E.
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