U.S. patent application number 11/517509 was filed with the patent office on 2007-05-31 for novel fan blade of a ceiling fan.
This patent application is currently assigned to SHELL ELECTRIC MFG. (HOLDINGS) CO., LTD.. Invention is credited to Chun Wah Leung, Jun Ren Zhao.
Application Number | 20070122286 11/517509 |
Document ID | / |
Family ID | 38087739 |
Filed Date | 2007-05-31 |
United States Patent
Application |
20070122286 |
Kind Code |
A1 |
Leung; Chun Wah ; et
al. |
May 31, 2007 |
Novel fan blade of a ceiling fan
Abstract
The present invention relates to novel fan blade of a ceiling
fan, wherein whole or partial perimeter of the blades was designed
to project outwardly, for example, the cross section of the
outwardly perimeter of the fan blade can be presented in a shape of
circular arc, oval, taper with circular arc, obliquity with
circular arc, truncated taper, truncated oblique or taper with
circular arc in which two sides of the projecting base have a
raised bench. A comparison test showed that, the rotational speed
and air volume of the novel fan blade according to the present
invention is 15-24% and 5-10% greater than those of the traditional
fan blades respectively, therefore resulting in saving of materials
and energy.
Inventors: |
Leung; Chun Wah; (Chai Wan,
HK) ; Zhao; Jun Ren; (Taishan City, CN) |
Correspondence
Address: |
RABIN & Berdo, PC
1101 14TH STREET, NW
SUITE 500
WASHINGTON
DC
20005
US
|
Assignee: |
SHELL ELECTRIC MFG. (HOLDINGS) CO.,
LTD.
Hong Kong
HK
|
Family ID: |
38087739 |
Appl. No.: |
11/517509 |
Filed: |
September 8, 2006 |
Current U.S.
Class: |
416/210R |
Current CPC
Class: |
F04D 29/384 20130101;
F04D 25/088 20130101 |
Class at
Publication: |
416/210.00R |
International
Class: |
F04D 29/34 20060101
F04D029/34 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 28, 2005 |
CN |
200520142042.5 |
Claims
1. A fan blade structure for a ceiling fan comprising: A fan blade;
and A mounting bracket to which one end of the fan blade is mounted
and by which the fan blade is locked to a motor; if necessary, the
fan blade may be directly mounted to the motor, characterized in
that whole or partial perimeter of the fan blade is made in an
outwardly projecting shape.
2. The fan blade of claim 1, wherein the cross section of the
outwardly projecting perimeter of the fan blade is in circular arc
shape.
3. The fan blade of claim 2, wherein that the radius of the
circular arc (R1) is 1.0-5.0 mm.
4. The fan blade of claim 1, wherein the cross section of the
outwardly projecting perimeter of the fan blade is in the shape of
taper with circular arc or in oval shape.
5. The fan blade of claim 4, wherein the radius of the circular arc
(R2) is 1-5 mm, and the taper angle (a1) is 10-60 degree,
preferably 25 degree.
6. The fan blade of claim 1, wherein the cross section of the
outwardly projecting perimeter of the fan blade is in the shape of
obliquity with circular arc.
7. The fan blade of claim 6, wherein the radius of the circular arc
(R3) is 1-5 mm, the obliquity (.alpha.2) is 10-60 degree,
preferably 25 degree.
8. The fan blade of claim 1, wherein the cross section of the
outwardly projecting perimeter of the fan blade is in the truncated
taper shape.
9. The fan blade of claim 8, wherein that the taper angle
(.alpha.3) is 10-60 degree, and the truncated width W1 is 1-5 mm,
preferably 3 mm.
10. The fan blade of claim 1, wherein that the cross section of the
outwardly projecting perimeter of the fan blade is in the truncated
oblique shape.
11. The fan blade of claim 10, wherein the obliquity (.alpha.4) is
10-60 degree, and the truncated width (W2) is 1-5 mm, preferably 3
mm.
12. The fan blade of claim 4, wherein the cross section of the
outwardly projecting perimeter of the fan blade is in the shape of
taper with circular arc, in which the radius of the circular arc
(R4) is 1-5 mm, and the taper angle (.alpha.S) is 10-60 degree,
preferably 25 degree; two sides of the projecting base have a
raised bench (d) respectively, the height of which is 0.01-2 mm,
preferably d is 0.05 mm.
13. The fan blade of claim 1, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
14. The fan blade of claim 2, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
15. The fan blade of claim 3, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
16. The fan blade of claim 4, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
17. The fan blade of claim 5, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
18. The fan blade of claim 6, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
19. The fan blade of claim 7, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
20. The fan blade of claim 8, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
21. The fan blade of claim 9, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
22. The fan blade of claim 10, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
23. The fan blade of claim 11, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
24. The fan blade of claim 12, wherein the fan blades are made of
wood plates, plywood, decorative fiberboard or other complex wooden
board, or plastic or other resin materials.
Description
FIELD OF THE UTILITY MODEL
[0001] The present invention relates to a ceiling fan, in
particular to a novel fan blade of the ceiling fan.
BACKGROUND OF UTILITY MODEL
[0002] A conventional ceiling fan, especially decorative ceiling
fan, has 4-6 fan blades, each blade structure comprises a fan blade
and a mounting bracket to which one end of the fan blade is locked
to a motor; if necessary, the fan blade may be directly mounted to
the motor, without use of the mounted bracket. In general, each of
the fan blades may be made from wood plates, plywood or fiberboard
by means of the woodworking machines. The perimeter of thus
processed fan blade is substantially perpendicular to two sides
surfaces of the fan blade except for being chamfered in ordinary
processing. Such a processing method is still used up to now.
[0003] To save energy, the inventor analyzed and studied the
traditional fan blades. The results showed that the resistance of
such a traditional fan blade relative to the relative wind is
higher and is increased with increasing of the power of the ceiling
fan and the thickness of the fan blade. To achieve the aim of
saving the energy, some novel blades must be designed to decrease
the air resistance of the fan blades.
SUMMARY OF THE UTILITY MODEL
[0004] It is an object of the present invention to provide a novel
fan blade of a ceiling fan. Such a blade not only can decrease the
air resistance but also save the energy significantly. Furthermore,
the appearance of the blades is embellished. In addition, the
production technique of the traditional fan blades can be kept
unchanged.
[0005] The novel fan blade according to the present invention which
comprises (1) A fan blade; and (2) A mounting bracket to which one
end of the fan blade is mounted and by which the fan blade is
locked to a motor; if necessary, the fan blade may be directly
mounted to the motor, characterized in that whole or partial
perimeter of the fan blade is made in an outwardly projecting
shape. For example, as seen from the cross section of the fan
blade, perimeter of the fan blade can be presented in a shape of
circular arc, oval, taper with circular arc, obliquity with
circular arc, truncated taper, truncated oblique or taper with
circular arc in which two sides of the projecting base have a
raised bench.
[0006] As whole or partial perimeter of the fan blade according the
present invention is designed to project outwardly, firstly, its
weight is reduced compared to the traditional fan blades. Secondly,
the air resistance is decreased. Thirdly, the appearance of the fan
blade is embellished.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The present invention will be better understood from the
following detailed description of the preferred embodiments, when
taken in connection the accompanying drawings, in which:
[0008] FIG. 1 shows a side view of a commercially available
decorative ceiling fan;
[0009] FIG. 2 shows a top view of a fan blade of commercially
available decorative ceiling fan;
[0010] FIG. 3 shows a perspective view of a mounting bracket by
which the fan blade is locked to a motor of a ceiling fan;
[0011] FIG. 4 shows a transverse sectional view of the fan blade
taken on line A1-A1 of FIG.2;
[0012] FIG. 5 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the circular arc shape
according to the present invention;
[0013] FIG. 6 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the shape of taper with
arc according to the present invention;
[0014] FIG. 7 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the shape of obliquity
with circular arc according to the present invention;
[0015] FIG. 8 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the truncated taper shape
according to the present invention;
[0016] FIG. 9 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the truncated oblique
shape according to the present invention; and
[0017] FIG. 10 shows a transverse sectional view of the outwardly
projecting perimeter of the fan blade in the shape of taper with
circular arc in which two sides of projecting base have a raised
bench according to the present invention.
EXAMPLES
[0018] Referring to FIG. 1, a commercially available decorative
ceiling fan is shown, including the fan blade 10, a mounting
bracket 12 to which the fan blade is mounted and a motor 14. The
mounting bracket 12 is mounted to the motor 14. As shown in FIG. 2,
there are the through holes at one end of the fan blade 10 for
connecting the mounting bracket 12 in a manner of riveting.
Referring to FIG. 3, the mounting bracket 12 is provided with a
plurality of holes in response to the through holes of the fan
blade and the holes on the motor so that the fan blade 10 is
mounted to the mounting bracket 12 and then to the motor 14.
[0019] The commercially available decorative ceiling fan blades are
simple plate structure, which has been used for long time. As shown
in FIG. 4, outer of the fan blade perimeter basically is
perpendicular to two sides of the fan blade, and the corner thereof
is required to be chamfered according to technical requirements
during processing. However, such chamfer is not able to attain the
same effect as that produced by the fan blade according to the
present invention.
[0020] In the traditional production technique of the fan blades,
the technique includes the following steps, if they are constructed
of fiberboard from 3 mm to 6 mm thickness: [0021] 1. Sticking a
wood grain paper of over both sides of the fiberboard; [0022] 2.
Making rough cutting according to the required fan blade shape;
[0023] 3. Carrying out edge milling of cutting edges; [0024] 4.
Drilling through holes at one end of the fan blade; [0025] 5.
Base-coating, edge sealing, lacquering the milled edges; and [0026]
6. Balance Weighting, matching and packing (for 5 ceiling fan
blades, the weight difference thereamong must be less than 2 g)
[0027] The fan blades of the present invention can be manufactured
using the above technique. However, in the step 3, carrying out
edge milling needs to use some special milling cutters with
different shapes in response to the different outwardly projecting
perimeters of the fan blades.
[0028] For example, the cross section of the outwardly projecting
perimeter of the fan blade 101 in accordance with the present
invention can be formed into the circular arc shape by means of
milling cutter in the circular arc shape, as shown in FIG. 5,
wherein the radius of the circular arc (R1) is 1.0-5.0 mm.
Similarly, the cross section of the outwardly projecting perimeter
of the fan blade 102 can be formed into the shape of taper with
circular arc or oval shape by means of milling cutter with
corresponding shape, as shown in FIG. 6, wherein the radius of the
circular arc (R2) is 1-5 mm, and the taper angle (.alpha.1)is 10-60
degree, preferably 25 degree. The cross section of the outwardly
projecting perimeter of the fan blade 103 can be formed into the
shape of obliquity with circular arc by means of milling cutter
with corresponding shape, as shown in FIG. 7, wherein the radius of
the circular arc (R3) is 1-5 mm, the obliquity (.alpha.2) is 10-60
degree, preferably 25 degree. The cross section of the outwardly
projecting perimeter of the fan blade 104 can be made into
truncated taper shape by means of milling cutter with corresponding
shape, as shown in FIG. 8, wherein the taper angle (.alpha.3) is
10-60 degree, preferably 25 degree, the truncated width (W1) is 1-5
mm, preferably 3 mm. The cross section of the outwardly projecting
perimeter of the fan blade 105 can be made into truncated oblique
shape by means of milling cutter with corresponding shape, as shown
in FIG. 9, wherein the obliquity (.alpha.4) is 10-60 degree,
preferably 25 degree, the truncated width (W2) is 1-5 mm,
preferably 3 mm. The cross section of the outwardly projecting
perimeter of the fan blade 106 can be formed into the shape of
taper with circular arc by means of milling cutter with
corresponding shape, as shown in FIG. 10, wherein the radius of the
circular arc (R4) is 1-5 mm, the taper angle (.alpha.5) is 10-60
degree, preferably 25 degree; while two sides of the projecting
base have a raised bench (d), the height of which is 0.01-2 mm,
preferably 0.05 mm.
[0029] The fan blades, of course, can also be made of wood plates,
plywood, decorative fiberboard or other complex wooden board or
plastic or other resin materials. The production techniques of fan
blades from wood plates, plywood, decorative fiberboard or other
complex wooden board are the same as that described above, for
except the plastic fan blades. The fan blades are made from the
plastic or resin material by injection molding technique in the
art, wherein the different shapes of the outwardly projecting
perimeter of the fan blades depend on the different shapes of the
corresponding moulds.
[0030] Lastly, a comparison test between the ceiling fans with the
fan blades according to the present invention (group A) and with
the traditional fan blades (group B) at the same conditions.
[0031] The comparison test results show that: [0032] 1. The ceiling
fan (group A) may increase the rotational speed which is 15-24%
greater than that of the traditional ceiling fan (group B); and
[0033] 2. The ceiling fan (group A) may have an increased air
volume which is 5-10% greater than that of the traditional ceiling
fan (group B).
[0034] The above comparison test results is enough to prove that,
to achieve rotational speed and air volume of the traditional
ceiling fan, the ceiling fan employing the fan blades in accordance
with the present invention may select a lower power motor so that
consumption of energy and/or raw materials can be reduced.
[0035] Although above preferred embodiment have been described in
great detail, for those skilled in the art, changes and
modifications may be made without departing the general design idea
and the present inventive concept. Such changes and modifications
shall fall within the scope of the present invention.
* * * * *