DESCRIPTION
CEILING FAN
TECHNICAL FIELD
The present invention relates to a ceiling fan suspended from a
ceiling.
BACKGROUND ART
A conventional ceiling fan includes a connecting fitting fixed to
a ceiling, and a ceiling fan main body suspended from the connecting
fitting via a suspension device.
When such a ceiling fan is operated in a state in which it is
suspended from a ceiling, a ceiling fan main body may occasionally
swing. That is to say, in a conventional ceiling fan, a shaft protruding
from the upper part of the ceiling fan main body is movably anchored
to the connecting fitting fixed to a ceiling. However, not-specified
swing components in all directions are generated due to vane weight
and unbalanced pitch in a ceiling fan, circulation air generated during
operation of a ceiling fan main body, outside wind, and the like,
causing a ceiling fan main body to swing non-constantly.
In such circumstances, conventionally, in order to suppress
swing, a ceiling fan main body is firmly fixed to a ceiling via a
suspension structure so as to reduce the swing width of the ceiling fan
main body. However, an abnormal noise may occur on a ceiling
depending on ceiling structures.
[Citation List]

[Patent Document 1] Japanese Patent Application Unexamined
Publication No. H3-294696
SUMMARY OF THE INVENTION
A ceiling fan of the present invention includes a connecting
fitting fixed to a ceiling; and a ceiling fan main body suspended from
the connecting fitting via a suspension device. The ceiling fan main
body includes a motor for rotating a plurality of blades attached in a
horizontal direction, a shaft protruding to an upper part of the motor,
and a joint portion fixed on an upper part of the shaft. The
suspension device includes a first connecting portion capable of being
movably mounted on the connecting fitting; and a second connecting
portion located in a lower part of the first connecting portion. The
joint portion is movably mounted on the second connecting portion.
Such a ceiling fan has a suspension device provided with two
movable connecting portions between a connecting fitting fixed to a
ceiling and a ceiling fan main body. Therefore, the transmission of
the vibration of the ceiling fan main body during operation is reduced
by the two movable connecting portions. Furthermore, the swing of
the ceiling fan main body during operation is partially cancelled by the
two movable connecting portions. As a result, the vibration of the
ceiling fan main body during operation is not easily transmitted to the
ceiling, and the swing of the ceiling fan main body can be suppressed.
Thus, the occurrence of an abnormal noise on the ceiling is reduced
significantly.
BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a side view showing a ceiling fan in accordance with a
first exemplary embodiment of the present invention.
Fig. 2 is a perspective view showing the ceiling fan.
Fig. 3 is a side view showing a ceiling fan in accordance with a
second exemplary embodiment of the present invention.
Fig. 4 is a perspective view showing the ceiling fan.
Fig. 5 is an enlarged view showing a principal part of a
suspension device of the ceiling fan.
Fig. 6 is a side view showing a ceiling fan in accordance with a
third exemplary embodiment of the present invention.
Fig. 7 is a side view showing a ceiling fan in accordance with a
fourth exemplary embodiment of the present invention.
Fig. 8 is a development view showing a principal part of a
suspension device of the ceiling fan.
Fig. 9 is a development view showing a principal part of a
suspension device of a ceiling fan in accordance with a fifth exemplary
embodiment of the present invention.
Fig. 10 is a development view showing a principal part of a
suspension device of a ceiling fan in accordance with a sixth exemplary
embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Hereinafter, exemplary embodiments of the present invention
are described with reference to drawings.
(FIRST EXEMPLARY EMBODIMENT)
Fig. 1 is a side view showing a ceiling fan in accordance with a
first exemplary embodiment of the present invention; Fig. 2 is a

perspective view showing the ceiling fan. Ceiling fan 50 includes
connecting fitting 6, suspension device 7, and ceiling fan main body 1.
Herein, connecting fitting 6 is fixed to ceiling 5. Ceiling fan main
body 1 is suspended from connecting fitting 6 via suspension device 7.
Suspension device 7 includes a first connecting portion
including horizontal axis connecting portion 8 and a second connecting
portion including horizontal axis connecting portion 9. Herein, the
first connecting portion can be movably mounted on connecting fitting
6. The second connecting portion is located in the lower part of the
first connecting portion.
Ceiling fan main body 1 includes motor 3, shaft 4, and joint
portion 10. Herein, motor 3 rotates a plurality of blades 2 attached in
the horizontal direction. Shaft 4 protrudes to the upper part of motor
3. Joint portion 10 is fixed to the upper part of shaft 4, and movably
mounted on the second connecting portion.
Furthermore, central axis 14 of shaft 4 is defined as Y-axis 11,
and coordinates of the horizontal plane perpendicular to Y-axis 11 are
defined as X-axis 12 and Z-axis 13. Herein, the first connecting
portion is rotatable in the direction of X-axis 12 as a rotation axis.
Furthermore, the second connecting portion is rotatable in the
direction of Z-axis 13 as a rotation axis.
Horizontal axis connecting portion 8 as the first connecting
portion has pulley 22 on a columnar axis fixed in the horizontal
direction, and is hooked over hook-shaped connecting fitting 6 fixed to
ceiling 5. Furthermore, pulley 22 has groove 20 on the center of the
periphery thereof and is made of rubber.
Horizontal axis connecting portion 9 forming the second

connecting portion includes a columnar axis fixed in the horizontal
direction, and is hooked through joint portion 10 having a hole in the
upper part of shaft 4.
That is to say, suspension device 7 has a configuration in which
the columnar axis of the first connecting portion and the columnar axis
of the second connecting portion are fixed in a state in which they are
displaced by 90° in the horizontal direction by using suspension section
15.
Therefore, even if not-specified swing components in all
directions are generated due to the weight of ceiling fan main body 1
and blades 2, unbalanced pitch of blades 2, and air flow and circulation
air generated during operation, outside wind, and the like, and the
swing of ceiling fan main body 1 occurs non-constantly, they are
suppressed as follows. That is to say, a swing component in the
direction of rotation around X-axis 12 as a rotation axis is suppressed
by the first connecting portion. Furthermore, a swing component in
the direction of rotation around Z-axis 13 as a rotation axis is
suppressed by the second connecting portion. In this way, swing
components in the directions of rotation around X-axis 12 and Z-axis
13 can be handled. Therefore, the swing of ceiling fan main body 1
during operation can be suppressed.
(SECOND EXEMPLARY EMBODIMENT)
In accordance with a second exemplary embodiment of the
present invention, the same reference numerals are given to the same
elements as in the first exemplary embodiment and the description
thereof is omitted, and only different configuration is described. The

second exemplary embodiment of the present invention and the first
exemplary embodiment are different from each other in a configuration
of a second connecting portion.
Fig. 3 is a side view showing a ceiling fan in accordance with the
second exemplary embodiment of the present invention. Fig. 4 is a
perspective view showing the ceiling fan. Fig. 5 is an enlarged view
showing a principal part of a suspension device of the ceiling fan.
Suspension device 37 of ceiling fan 51 includes a first
connecting portion including horizontal axis connecting portion 8, and
a second connecting portion holding horizontal plane axis connecting
portion 16. The first connecting portion is rotatable in the direction of
X-axis 12 as a rotation axis. The second connecting portion is hanger
17 holding ball joint 21b rotatable around a rotation axis on the
horizontal plane including X-axis 12 and Z-axis 13.
Horizontal axis connecting portion 8 as the first connecting
portion has pulley 22 on a columnar axis fixed in the horizontal
direction, and is hooked over hook-shaped connecting fitting 6 fixed to
ceiling 5. Furthermore, pulley 22 has groove 20 on the center of the
periphery thereof and is made of rubber.
Hanger 17 as the second connecting portion has a bowl shape
movably holding ball joint 21b. Ball joint 21b forming joint portion 10
has a substantially hemispherical-shaped surface with groove 20b
provided thereon, and is fixed on the upper part of shaft 4.
Furthermore, hanger 17 includes notch portion 18b through which
shaft 4 is allowed to pass and protrusion 19b that can be inserted into
groove 20b.
That is to say, suspension device 37 has a configuration in

which the columnar axis having pulley 22 of the first connecting
portion is fixed to hanger 17, and hanger 17 as the second connecting
portion holds ball joint 21b.
With the above-mentioned configuration, a swing component in
the direction of rotation around X-axis 12 as a rotation axis is
suppressed by the first connecting portion. Furthermore, a swing
component in the direction of rotation having a rotation axis on the
plane including X-axis 12 and Z-axis 13 is suppressed by the second
connecting portion holding ball joint 21b. As a result, a swing
component in the rotation direction around X-axis 12 as a rotation axis
and a swing component in the direction of rotation having a rotation
axis on the horizontal plane can be handled. Therefore, the swing of
ceiling fan main body 1 during operation can be suppressed.
Furthermore, the swing of ceiling fan main body 1 during
operation is transmitted to joint portion 10 fixed to the upper part of
shaft 4, that is, ball joint 21b, via shaft 4 protruding to the upper part
of motor 3. Furthermore, the swing is transmitted to the first
connecting portion via hanger 17 as the second connecting portion. In
this way, the swing of ceiling fan main body 1 is not transmitted to the
first connecting portion and the second connecting portion
simultaneously. The swing is firstly transmitted to the second
connecting portion, and then to the first connecting portion late.
Consequently, in the first connecting portion and the second
connecting portion, the swing directions are opposite to each other, the
swing of ceiling fan main body 1 are partially cancelled, and the swing
of ceiling fan main body 1 during operation can be suppressed.
Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via

two connecting portions, that is, the first connecting portion and the
second connecting portion. Therefore, the transmission of the
vibration of ceiling fan main body 1 is suppressed by the two movable
connecting portions. As a result, the transmission of the vibration to
ceiling 5 is suppressed. Thus, the occurrence of an abnormal noise on
ceiling 5 can be suppressed.
Furthermore, even when shaft 4 of motor 3 and a suspension
structure portion of the connecting portion are to be rotated, the
rotation component in the rotation direction of Y-axis 11 can be fixed.
Then, it is possible to prevent ceiling fan main body 1 from being
wound on the suspension structure section such as a power wire for
supplying electric power to motor 3 and an anti-drop wire. This is
because hanger 17 for holding ball joint 21 is provided with protrusion
19 that can be inserted into groove 20.
Furthermore, suspension device 37 having such a configuration
can facilitate suspension to hanger 17 at the time of construction and it
can be applied to an inclined ceiling.
Furthermore, by using pulley 22 in the first connecting portion,
the swing component in the rotation direction of the axis of pulley 22
can be suppressed by pulley 22 with friction reduced. Therefore, it is
possible to suppress the swing of ceiling fan main body 1 during
operation and to facilitate suspension to a J-hook or a U-hook at the
time of construction.
Furthermore, since pulley 22 of the first connecting portion is
made of rubber, the vibration of ceiling fan main body 1 by rotation
during operation can be absorbed and relieved.

(THIRD EXEMPLARY EMBODIMENT)
In accordance with a third exemplary embodiment of the
present invention, the same reference numerals are given to the same
elements as in the first exemplary embodiment and the description
thereof is omitted, and only different configurations are described.
The third exemplary embodiment of the present invention and the first
exemplary embodiment are different from each other in a configuration
of a first connecting portion.
Fig. 6 is a side view showing a ceiling fan in accordance with the
third exemplary embodiment of the present invention. Suspension
device 47 of ceiling fan 52 includes a first connecting portion that is
horizontal plane axis connecting portion 23 and a second connecting
portion that is horizontal axis connecting portion 9. The first
connecting portion is rotatable around a rotation axis on the horizontal
plane including X-axis 12 and Z-axis 13. The second connecting
portion is rotatable in the direction of X-axis 12 as a rotation axis.
Horizontal plane axis connecting portion 23 that is the first
connecting portion includes ball joint 21a. Ball joint 21a fixed to
suspension section 15 has a substantially hemispherical shape and has
a groove (not shown) on the spherical surface thereof. Connecting
fitting 46 is fixed to ceiling 5, and has a notch portion and a protrusion
(both are not shown). Furthermore, the notch portion has a bowl
shape which movably holds ball joint 21a and through which
suspension section 15 is allowed to pass. The protrusion can be
inserted into the groove. Joint portion 10 is provided with a hole (not
shown).
Horizontal axis connecting portion 9 that is the second

connecting portion includes a columnar axis fixed in the horizontal
direction, and is rotatably hooked through the hole of joint portion 10.
That is to say, suspension device 47 has a configuration in
which a columnar axis that forms the second connecting portion and
ball joint 21a that forms the first connecting portion are fixed by
suspension section 15.
With the above-mentioned configuration, a swing component in
the direction of rotation having a rotation axis on the plane including
X-axis 12 and Z-axis 13 is suppressed by the first connecting portion.
Furthermore, a swing component in the rotation direction around
X-axis 12 as a rotation axis is suppressed by the second connecting
portion. As a result, a swing component in the direction of rotation
having a rotation axis on the horizontal plane and a swing component
in the direction of rotation around X-axis 12 as a rotation axis can be
handled. Therefore, the swing of ceiling fan main body 1 during
operation can be suppressed.
Furthermore, the swing of ceiling fan main body 1 during
operation is transmitted to joint portion 10 fixed to the upper part of
shaft 4, that is, the second joint portion via shaft 4 protruding to the
upper part of motor 3. Furthermore, the swing is transmitted to the
first connecting portion via suspension device 47. In this way, the
swing of ceiling fan main body 1 is not transmitted to the first
connecting portion and the second connecting portion simultaneously.
The swing is firstly transmitted to the second connecting portion, and
then to the first connecting portion late. Consequently, in the first
connecting portion and the second connecting portion, the swing
directions are opposite to each other, the swing of ceiling fan main body

1 are partially cancelled, and the swing of ceiling fan main body 1
during operation can be suppressed.
Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via
two connecting portions, that is, the first connecting portion and the
second connecting portion. Therefore, the transmission of the
vibration of ceiling fan main body 1 is suppressed by the two movable
connecting portions. As a result, the transmission of the vibration to
ceiling 5 is suppressed. Thus, the occurrence of an abnormal noise on
ceiling 5 can be suppressed.
Furthermore, even when shaft 4 of motor 3 and a suspension
structure portion of the connecting portion are to be rotated, the
rotation component in the rotation direction of Y-axis 11 can be fixed.
Then, it is possible to prevent ceiling fan main body 1 from being
wound on the suspension structure section such as a power wire for
supplying electric power to motor 3 and an anti-drop wire. This is
because connecting fitting 46 has a notch portion for rotatably holding
ball joint 21a and a protrusion that can be inserted into the groove.
Furthermore, suspension device 47 having such a configuration
can facilitate suspension to hanger 17 at the time of construction and it
can be applied to an inclined ceiling.
(FOURTH EXEMPLARY EMBODIMENT)
In accordance with a fourth exemplary embodiment of the
present invention, the same reference numerals are given to the same
elements as in the first to third exemplary embodiments and the
description thereof is omitted, and only different configurations are
described. The fourth exemplary embodiment of the present

invention and the third exemplary embodiment are different from each
other in a configuration of a second connecting portion.
Fig. 7 is a side view showing a ceiling fan in accordance with the
fourth exemplary embodiment of the present invention. Fig. 8 is a
development view showing a principal part of a suspension device of
the ceiling fan. Suspension device 57 of ceiling fan 53 includes a first
connecting portion that is horizontal plane axis connecting portion 23
and a second connecting portion holding horizontal plane axis
connecting portion 16.
Horizontal plane axis connecting portion 23 as the first
connecting portion includes ball joint 21a, and hanger 17 as the second
connecting portion holds ball joint 21b of horizontal plane axis
connecting portion 16.
The first connecting portion is rotatable around a rotation axis
on a horizontal plane including X-axis 12 and Z-axis 13. Ball joint
21a fixed to connecting member 25 has a substantially hemispherical
shape and has groove 20a on the spherical surface. Connecting fitting
46 is fixed to ceiling 5, and has notch portion 18a and protrusion 19a.
Notch portion 18a has a bowl shape which movably holds ball joint 21a
and through which connecting member 25 is allowed to pass.
Protrusion 19a can be inserted into groove 20a. Connecting fitting 46
is fixed to ceiling 5, and has notch portion 18a and protrusion 19a.
Joint portion 10 includes ball joint 21b. Ball joint 21b has a
substantially hemispherical shape and has groove 20b on the spherical
surface. Hanger 17 includes notch portion 18b through which shaft 4
is allowed to pass and protrusion 19b.
That is to say, suspension device 57 has a configuration in

which ball joint 21a forming the first connecting portion is fixed to
hanger 17 of the second connecting portion movably holding ball joint
21b.
With the above-mentioned configuration, a swing component in
the direction of rotation having a rotation axis on the plane including
X-axis 12 and Z-axis 13 is suppressed by upper and lower connecting
portions, i.e., the first connecting portion and the second connecting
portion, and the swing of ceiling fan main body 1 during operation can
be suppressed.
Furthermore, the swing of ceiling fan main body 1 during
operation is transmitted to joint portion 10 fixed to the upper part of
shaft 4 via shaft 4 protruding to the upper part of motor 3.
Furthermore, the swing is transmitted to the first connecting portion
via hanger 17 forming the second connecting portion. In this way, the
swing of ceiling fan main body 1 is not transmitted to the first
connecting portion and the second connecting portion simultaneously.
The swing is firstly transmitted to the second connecting portion, and
then to the first connecting portion late. Consequently, in the first
connecting portion and the second connecting portion, the swing
directions are opposite to each other, the swing of ceiling fan main body
1 are partially cancelled, and the swing of ceiling fan main body 1
during operation can be suppressed.
Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via
two connecting portions, that is, the first connecting portion and the
second connecting portion. Therefore, the transmission of the
vibration of ceiling fan main body 1 is suppressed by the two movable
connecting portions. As a result, the transmission of the vibration to

ceiling 5 is suppressed. Thus, the occurrence of an abnormal noise on
ceiling 5 can be suppressed.
Furthermore, even when shaft 4 of motor 3 and a suspension
structure portion of the connecting portion are to be rotated, the
rotation component in the rotation direction of Y-axis 11 can be fixed.
Then, it is possible to prevent ceiling fan main body 1 from being
wound on the suspension structure section such as a power wire for
supplying electric power to motor 3 and an anti-drop wire. This is
because hanger 17 holding ball joint 21b has notch portion 18b and
protrusion 19 that can be inserted into groove 20b.
Furthermore, suspension device 57 having such a configuration
can facilitate suspension to hanger 17 at the time of construction and it
can be applied to an inclined ceiling.
(FIFTH EXEMPLARY EMBODIMENT)
In accordance with a fifth exemplary embodiment of the present
invention, the same reference numerals are given to the same elements
as in the first to fourth exemplary embodiments and the description
thereof is omitted, and only different configurations are described.
The fifth exemplary embodiment of the present invention and the
fourth exemplary embodiment are different from each other in a
configuration of a first connecting portion.
Fig. 9 is a development view showing a principal part of a
suspension device of a ceiling fan in accordance with the fifth
exemplary embodiment of the present invention.
Suspension device 67 of ceiling fan 54 includes a first
connecting portion that is three-dimensional axis connecting portion

24 and a second connecting portion holding horizontal plane axis
connecting portion 16.
The first connecting portion that is three-dimensional axis
connecting portion 24 includes ball joint 21c fixed to connecting
member 25 and having a substantially hemispherical shape. Ball
joint 21c is rotatable in all the three-dimensional directions, X-axis 12,
Y-axis 11, and Z-axis 13 as rotation axes.
The second connecting portion is hanger 17 holding ball joint
21b rotatable around a rotation axis on the horizontal plane including
X-axis 12 and Z-axis 13.
Connecting fitting 46 fixed to ceiling 5 includes notch portion
18a. Notch portion 18a has a bowl shape which movably holds ball
joint 21c and through which connecting member 25 is allowed to pass.
Joint portion 10 includes a substantially hemispherical-shaped
ball joint 21b. Hanger 17 includes notch portion 18b, and protrusion
19b that can be inserted into groove 20b. Notch portion 18b has a
bowl shape which movably holds ball joint 21b and through which shaft
4 is allowed to pass.
That is to say, suspension device 67 has a configuration in
which ball joint 21c forming the first connecting portion is fixed to
hanger 17 as the second connecting portion movably holding ball joint
21b.
With the above-mentioned configuration, a swing component by
axial torque in the rotation direction of motor 3 and a swing component
in the direction of rotation having a rotation axis on the horizontal
plane including X-axis 12 and Z-axis 13 are suppressed by the first
connecting portion. Furthermore, a swing component in the direction

of rotation having a rotation axis on the horizontal plane including
X-axis 12 and Z-axis 13 is suppressed by the second connecting portion.
In this way, since each swing component can be handled, the swing of
ceiling fan main body 1 during operation can be suppressed.
Furthermore, the swing of ceiling fan main body 1 during
operation is transmitted to joint portion 10 fixed to the upper part of
shaft 4 via shaft 4 protruding to the upper part of motor 3.
Furthermore, the swing is transmitted to the first connecting portion
via the second connecting portion. In this way, the swing of ceiling
fan main body 1 is not transmitted to the first connecting portion and
the second connecting portion simultaneously. The swing is firstly
transmitted to the second connecting portion, and then to the first
connecting portion late. Consequently, in the first connecting portion
and the second connecting portion, the swing directions are opposite to
each other, the swing of ceiling fan main body 1 are partially cancelled,
and the swing of ceiling fan main body 1 during operation can be
suppressed.
Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via
two connecting portions, that is, the first connecting portion and the
second connecting portion. Therefore, the transmission of the
vibration of ceiling fan main body 1 is suppressed by the two movable
connecting portions. As a result, the transmission of the vibration to
ceiling 5 is suppressed. Thus, the occurrence of an abnormal noise on
ceiling 5 can be suppressed.
Furthermore, by using three-dimensional axis connecting
portion 24 including ball joint 21c for the first connecting portion, a
structure having a degree of freedom in the rotation direction of all

axes can be achieved. As a result, the swing component can be
suppressed by ball joint 21c with friction reduced, and therefore, the
swing of ceiling fan main body 1 during operation can be suppressed.
This structure can facilitate suspension to hanger 17 at the time of
construction and it can be applied to an inclined ceiling.
Furthermore, even when shaft 4 of motor 3 and a suspension
structure portion of the connecting portion are to be rotated, the
rotation component in the rotation direction of Y-axis 11 can be fixed.
Then, it is possible to prevent ceiling fan main body 1 from being
wound on the suspension structure section such as a power wire for
supplying electric power to motor 3 and an anti-drop wire. This is
because hanger 17 holding ball joint 21b includes notch portion 18b,
and protrusion 19b that can be inserted into groove 20b.
(SIXTH EXEMPLARY EMBODIMENT)
In accordance with a sixth exemplary embodiment of the
present invention, the same reference numerals are given to the same
elements as in the first to fifth exemplary embodiments and the
description thereof is omitted, and only different configurations are
described.
Fig. 10 is a development view showing a principal part of a
suspension device of a ceiling fan in accordance with the sixth
exemplary embodiment of the present invention. Suspension device
77 of ceiling fan 55 includes a first connecting portion that is
three-dimensional axis connecting portion 24a, and a second
connecting portion holding three-dimensional axis connecting portion
24b. Herein, three-dimensional axis connecting portions 24a and 24b

have rotation axes rotatable in all the directions in three dimensions.
Three-dimensional axis connecting portion 24a as the first
connecting portion includes substantially hemispherical-shaped ball
joint 21c fixed to connecting member 25. Connecting fitting 46 fixed
to ceiling 5 includes notch portion 18a. Notch portion 18a has a bowl
shape which movably holds ball joint 21c and through which
connecting member 25 is allowed to pass.
Joint portion 10 includes substantially hemispherical-shaped
ball joint 21c. Hanger 17 as the second connecting portion holds
three-dimensional axis connecting portion 24b. That is to say, hanger
17 has a bowl shape which movably holds ball joint 21c and through
which shaft 4 is allowed to pass.
That is to say, suspension device 77 has a configuration in
which ball joint 21c forming the first connecting portion is fixed to
hanger 17 as the second connecting portion movably holding ball joint
21c.
With the above-mentioned configuration, a swing component
due to axial torque in the direction of the rotation of motor 3, and a
swing component in the direction of rotation around X-axis 12 and
Z-axis 13 as a rotation axis can be suppressed by the first connecting
portion and the second connecting portion. Therefore, it is possible to
suppress ceiling fan main body 1 during operation.
The swing of ceiling fan main body 1 during operation is
transmitted to joint portion 10 fixed to the upper part of shaft 4 via
shaft 4 protruding to the upper part of motor 3. Furthermore, the
swing is transmitted to the first connecting portion via hanger 17 as
the second connecting portion. In this way, the swing of ceiling fan

main body 1 is not transmitted to the first connecting portion and the
second connecting portion simultaneously. The swing is firstly
transmitted to the second connecting portion, and then to the first
connecting portion late. Consequently, in the first connecting portion
and the second connecting portion, it is thought that the swing
directions are opposite to each other, the swing of ceiling fan main body
1 are partially cancelled, and the swing of ceiling fan main body 1
during operation can be suppressed.
Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via
two connecting portions, that is, the first connecting portion and the
second connecting portion. Therefore, the transmission of the
vibration of ceiling fan main body 1 is suppressed by the two movable
connecting portions. As a result, the transmission of the vibration to
ceiling 5 is suppressed. Thus, the occurrence of an abnormal noise on
ceiling 5 can be suppressed.
Furthermore, suspension device 77 having such a configuration
can facilitate suspension to hanger 17 at the time of construction and it
can be applied to an inclined ceiling.
INDUSTRIAL APPLICABILITY
As mentioned above, the present invention can suppress the
occurrence of an abnormal noise on a ceiling and is useful as ceiling
fans for household use or office use.
REFERENCE MARKS IN THE DRAWINGS
1 ceiling fan main body
2 blade

3 motor
4 shaft
5 ceiling

6, 46 connecting fitting
7, 37, 47, 57, 67, 77 suspension device
8, 9 horizontal axis connecting portion

10 joint portion
11 Y-axis
12 X-axis
13 Z-axis
14 central axis
15 suspension section
16, 23 horizontal plane axis connecting portion
17 hanger
18a, 18b notch portion
19, 19a, 19b protrusion
20, 20a, 20b groove
21, 21a, 21b, 21c ball joint
22 pulley
24, 24a, 24b three-dimensional axis connecting portion
25 connecting member
50, 51, 52, 53, 54, 55 ceiling fan

We Claim:
1. A ceiling fan comprising:
a connecting fitting fixed to a ceiling; and
a ceiling fan main body suspended from the connecting fitting
via a suspension device,
wherein the ceiling fan main body comprises:
a motor for rotating a plurality of blades attached in a
horizontal direction;
a shaft protruding to an upper part of the motor, and
a joint portion fixed on an upper part of the shaft,
the suspension device comprises:
a first connecting portion capable of being movably
mounted on the connecting fitting; and
a second connecting portion located under a lower part
of the first connecting portion, and
the joint portion is movably mounted on the second connecting
portion.
2. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis, and when coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first
connecting portion is a horizontal axis connecting portion rotatable in
the direction of the X-axis as a rotation axis, and the second connecting
portion is a horizontal axis connecting portion rotatable in the
direction of the Z-axis as a rotation axis.

3. The ceiling fan of claim 2,
wherein the connecting fitting has a hook shape,
the first connecting portion includes a columnar axis which is
fixed in the horizontal direction and which the connecting fitting is
hooked over,
the joint portion has a hole, and
the second connecting portion includes a columnar axis which is
fixed in the horizontal direction and which is hooked through the hole
of the joint portion.
4. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis, and when coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first
connecting portion is a horizontal axis connecting portion rotatable in
the direction of the X-axis as a rotation axis, and the second connecting
portion is a hanger that holds a horizontal plane axis connecting
portion rotatable around a rotation axis on the horizontal plane.
5. The ceiling fan of claim 4,
wherein the connecting fitting has a hook shape,
the first connecting portion includes a columnar axis which is
fixed in the horizontal direction and which the connecting fitting is
hooked over,
the joint portion is a ball joint having a substantially
hemispherical-shaped surface with a groove provided thereon,

the second connecting portion has a bowl shape movably holding
the ball joint and including a notch portion through which the shaft is
allowed to pass and a protrusion that can be inserted into the groove.
6. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis and coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first
connecting portion is a horizontal plane axis connecting portion
rotatable around a rotation axis on the horizontal plane, and the
second connecting portion is a horizontal axis connecting portion
rotatable in the direction of the X-axis as a rotation axis.
7. The ceiling fan of claim 6,
wherein the first connecting portion is a ball joint fixed to the
shaft and having a substantially hemispherical-shaped surface with a
groove provided thereon,
the connecting fitting has a bowl shape movably holding the ball
joint and including a notch portion through which the shaft is allowed
to pass and a protrusion that can be inserted into the groove,
the joint portion is a hook provided with a hole, and
the second connecting portion includes a columnar axis hooked
through the hole and fixed in the horizontal direction.
8. The ceiling fan of any one of claims 3, 5 and 7,
wherein the columnar axis has a pulley.

9. The ceiling fan of claim 8,
wherein the pulley is made of rubber.
10. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis and coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first
connecting portion is a horizontal plane axis connecting portion
rotatable around a rotation axis on the horizontal plane, and the
second connecting portion is a hanger holding a horizontal plane axis
connecting portion rotatable around a rotation axis on the horizontal
plane.
11. The ceiling fan of claim 10,
wherein the first connecting portion is a ball joint fixed to the
shaft and having a substantially hemispherical-shaped surface with a
groove provided thereon,
the connecting fitting has a bowl shape movably holding the ball
joint and including a notch portion through which the shaft is allowed
to pass and a protrusion that can be inserted into the groove,
the joint portion is a ball joint having a substantially
hemispherical-shaped surface with a groove provided thereon, and
the second connecting portion has a bowl shape movably holding
a ball joint of the joint portion and including a notch portion through
which the shaft is allowed to pass and a protrusion that can be inserted
into the groove.

12. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis and coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first
connecting portion is a three-dimensional axis connecting portion
rotatable around rotation axes in all directions in three dimensions,
and the second connecting portion is a hanger holding a horizontal
plane axis connecting portion rotatable around a rotation axis on the
horizontal plane.
13. The ceiling fan of claim 12,
wherein the first connecting portion is a ball joint fixed to the
shaft and having a substantially hemispherical shape,
the connecting fitting has a bowl shape movably holding the ball
joint and including a notch portion through which the shaft is allowed
to pass,
the joint portion is a ball joint having a substantially
hemispherical-shaped surface with a groove provided thereon, and
the second connecting portion has a bowl shape movably holding
a ball joint of the joint portion and including a notch portion through
which the shaft is allowed to pass and a protrusion that can be inserted
into the groove.
14. The ceiling fan of claim 1,
wherein in the suspension device, when a central axis of the
shaft is defined as Y-axis and coordinates of a horizontal plane
perpendicular to the Y-axis are defined as X-axis and Z-axis, the first

connecting portion is a three-dimensional axis connecting portion
rotatable around rotation axes in all directions in three dimensions,
and the second connecting portion is a hanger holding a
three-dimensional axis connecting portion having rotation axes in all
directions in three dimensions.
15. The ceiling fan of claim 14,
wherein the first connecting portion is a ball joint fixed to the
shaft and having a substantially hemispherical shape,
the connecting fitting has a bowl shape movably holding the ball
joint and including a notch portion through which the shaft is allowed
to pass,
the joint portion is a ball joint having a substantially
hemispherical shape, and
the second connecting portion has a bowl shape movably holding
a ball joint of the joint portion and including a notch portion through
which the shaft is allowed to pass.

A ceiling fan including a connecting fitting fixed to a ceiling,
and a ceiling fan main body suspended from the connecting fitting via a
suspension device. The ceiling fan main body includes a motor for
rotating a plurality of blades attached in a horizontal direction, a shaft
protruding to an upper part of the motor, and a joint portion fixed on
an upper part of the shaft. The suspension device includes a first
connecting portion capable of being movably mounted on the
connecting fitting, and a second connecting portion located in a lower
part of the first connecting portion. The joint portion is movably
mounted on the second connecting portion.