Patent Publication Number: US-2011052411-A1

Title: Ceiling fan

Description:
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  21   b  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  21   b . Ball joint  21   b  forming joint portion  10  has a substantially hemispherical-shaped surface with groove  20   b  provided thereon, and is fixed on the upper part of shaft  4 . Furthermore, hanger  17  includes notch portion  18   b  through which shaft  4  is allowed to pass and protrusion  19   b  that can be inserted into groove  20   b.    
     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  21   b.    
     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  21   b . 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  21   b , 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  21   a . Ball joint  21   a  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  21   a  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  21   a  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  21   a  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  21   a , and hanger  17  as the second connecting portion holds ball joint  21   b  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  21   a  fixed to connecting member  25  has a substantially hemispherical shape and has groove  20   a  on the spherical surface. Connecting fitting  46  is fixed to ceiling  5 , and has notch portion  18   a  and protrusion  19   a . Notch portion  18   a  has a bowl shape which movably holds ball joint  21   a  and through which connecting member  25  is allowed to pass. Protrusion  19   a  can be inserted into groove  20   a . Connecting fitting  46  is fixed to ceiling  5 , and has notch portion  18   a  and protrusion  19   a.    
     Joint portion  10  includes ball joint  21   b . Ball joint  21   b  has a substantially hemispherical shape and has groove  20   b  on the spherical surface. Hanger  17  includes notch portion  18   b  through which shaft  4  is allowed to pass and protrusion  19   b.    
     That is to say, suspension device  57  has a configuration in which ball joint  21   a  forming the first connecting portion is fixed to hanger  17  of the second connecting portion movably holding ball joint  21   b.    
     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  21   b  has notch portion  18   b  and protrusion  19  that can be inserted into groove  20   b.    
     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  21   c  fixed to connecting member  25  and having a substantially hemispherical shape. Ball joint  21   c  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  21   b  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  18   a . Notch portion  18   a  has a bowl shape which movably holds ball joint  21   c  and through which connecting member  25  is allowed to pass. 
     Joint portion  10  includes a substantially hemispherical-shaped ball joint  21   b . Hanger  17  includes notch portion  18   b , and protrusion  19   b  that can be inserted into groove  20   b . Notch portion  18   b  has a bowl shape which movably holds ball joint  21   b  and through which shaft  4  is allowed to pass. 
     That is to say, suspension device  67  has a configuration in which ball joint  21   c  forming the first connecting portion is fixed to hanger  17  as the second connecting portion movably holding ball joint  21   b.    
     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  21   c  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  21   c  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  21   b  includes notch portion  18   b , and protrusion  19   b  that can be inserted into groove  20   b.    
     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  24   a , and a second connecting portion holding three-dimensional axis connecting portion  24   b . Herein, three-dimensional axis connecting portions  24   a  and  24   b  have rotation axes rotatable in all the directions in three dimensions. 
     Three-dimensional axis connecting portion  24   a  as the first connecting portion includes substantially hemispherical-shaped ball joint  21   c  fixed to connecting member  25 . Connecting fitting  46  fixed to ceiling  5  includes notch portion  18   a . Notch portion  18   a  has a bowl shape which movably holds ball joint  21   c  and through which connecting member  25  is allowed to pass. 
     Joint portion  10  includes substantially hemispherical-shaped ball joint  21   c . Hanger  17  as the second connecting portion holds three-dimensional axis connecting portion  24   b . That is to say, hanger  17  has a bowl shape which movably holds ball joint  21   c  and through which shaft  4  is allowed to pass. 
     That is to say, suspension device  77  has a configuration in which ball joint  21   c  forming the first connecting portion is fixed to hanger  17  as the second connecting portion movably holding ball joint  21   c.    
     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 
           18   a ,  18   b  notch portion 
           19 ,  19   a ,  19   b  protrusion 
           20 ,  20   a ,  20   b  groove 
           21 ,  21   a ,  21   b ,  21   c  ball joint 
           22  pulley 
           24 ,  24   a ,  24   b  three-dimensional axis connecting portion 
           25  connecting member 
           50 ,  51 ,  52 ,  53 ,  54 ,  55  ceiling fan