DESCRIPTION
CEILING FAN
TECHNICAL FIELD
The present invention relates to a ceiling fan suspended from a
ceiling, and used for reducing the sensible temperature by direct
supply of air and for circulating air in a room.
BACKGROUND ART
Conventionally, as a ceiling fan of this kind, a ceiling fan has
been known in which stationary blades whose elevation/depression
angle for changing the wind direction is rotatable are disposed at the
downstream side of rotating blade plates radially arranged on the
outer periphery of an electric motor (see, for example, Patent
Document 1).
Hereinafter, the ceiling fan is described with reference to Figs.
17A, 17B, 18A, and 18B. Fig. 17A is an external perspective view
showing a conventional ceiling fan, and Fig. 17B is an external top
view showing the ceiling fan. Fig. 18A is an external side view
showing a principal part of the ceiling fan, and Fig. 18B is an external
side view showing an air flow of the ceiling fan.
As shown in Figs. 17Ato 18B, a plurality of blade plates 107 are
radially disposed on rotor 105 incorporating electric motor 104 (see Fig.
18B). A plurality of plate-shaped stationary blades 110 fixed to
non-rotating portion 106 are disposed in a lower part of blade plates
107. With such a configuration, as shown in Figs. 18A and 18B, since

a pressure is increased by collecting the kinetic energy of
circumferential direction component 114 of blown air 113 flown out of
blade plate 107, the air blowing efficiency can be improved.
Furthermore, by changing the rate of circumferential direction
component 114 and downward component 118 of blown air 113, the
arrival range of blown air can be changed.
In this way, in a conventional ceiling fan, in order to adjust an
air current from moving blades such as blade plates 107, a plurality of
stationary blades 110 may be provided at the downstream side of the
moving blades. In such a case, when elevation/depression angle 9s of
each stationary blade is changed, a plurality of driving motors are
required. Alternatively, when one driving motor is used, a plurality of
gears for converting and transmitting a rotation torque of one driving
motor are required. Therefore, in any case, a number of components
to be used for transmission is increased, thus complicating the
structure. Furthermore, when repeated load of blown air is applied
from the moving blade to stationary blade 110 for a long time, a fatigue
failure occurs in the vicinity of the root of stationary blade 110, and the
stationary blade may be broken. Thus, when the stationary blade is
broken, stationary blade 110 may drop off.
[Patent Document 1] Japanese Patent Application Unexamined
Publication No. 2007-198337
SUMMARY OF THE INVENTION
The present invention provides a ceiling fan having a
configuration in which stationary blades whose elevation/depression
angle is changeable are disposed at the downstream side of moving

blades, and the number of components for transmitting a driving
torque is reduced as possible so as to simplify a structure.
The present invention has a configuration which includes: an
outer-rotation motor portion including a disk-like stator with a center
through which a fixed axis passes, and an annular-shaped rotor
pivotally supported capable of rotating around the stator,' a plurality of
blade plates radially arranged on the rotor; a support base having the
fixed axis in a center of thereof and located in a lower part of the
statorl an annular-shaped angle changing unit provided on the support
base; and a plurality of stationary blade plates being detachably placed
on stationary blade holders provided on the angle changing unit. An
elevation/depression angle of the stationary blade plates is adjustable
by at least one stationary blade driving motor that drives the angle
changing unit.
According to such a configuration, stationary blades whose
elevation/depression angle is changeable are disposed at the
downstream side of moving blades, and the number of components for
transmitting a driving torque can be reduced as possible so as to
simplify a structure.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view showing a principal part of a ceiling
fan in accordance with a first exemplary embodiment of the present
invention.
Fig. 2 is an external perspective view showing the ceiling fan.
Fig. 3 is an exploded perspective view showing an angle
changing unit of the ceiling fan in a state in which a back surface faces

upward.
Fig. 4 is an external perspective view showing an angle
changing unit of the ceiling fan in a state in which a back surface faces
upward.
Fig. 5A is an enlarged view of a principal part showing an
operation of a round cam of the angle changing unit of the ceiling fan.
Fig. 5B is an enlarged view of a principal part showing an
operation of a linkage and a stationary blade plate of the angle
changing unit of the ceiling fan.
Fig. 6 is a schematic sectional view showing the linkage of the
ceiling fan.
Fig. 7 is a sectional view of a principal part showing a relation
between the linkage and a stationary blade holder of the ceiling fan.
Fig. 8 is a view illustrating a relation between the stationary
blade plate and a blade plate of the ceiling fan.
Fig. 9 is an exploded perspective view showing a relation
between a stationary blade plate and a movable plate portion in
accordance with a second exemplary embodiment of the present
invention.
Fig. 10 is a sectional view of a principal part in assembly of a
stationary blade holder and the stationary blade plate of the ceiling
fan.
Fig. 11A is an external perspective view before assembly of the
stationary blade holder and the stationary blade plate of the ceiling
fan.
Fig. 11B is an external perspective view during assembly of the
stationary blade holder and the stationary blade plate of the ceiling

fan.
Fig. 11C is an external perspective view after assembly of the
stationary blade holder and the stationary blade plate of the ceiling
fan.
Fig. 12 is a sectional view of a principal part showing a state of
a pressing spring when the stationary blade plate of the ceiling fan is
assembled.
Fig. 13 is a bottom view showing a relation between the total
length of the blade plate and the total length of the stationary blade
plate of the ceiling fan.
Fig. 14 is an external perspective view of the stationary blade
plate of the ceiling fan.
Fig. 15 is an external side view of the stationary blade plate of
the ceiling fan.
Fig. 16A is an external side view showing a ceiling fan without
including a support base of the ceiling fan.
Fig. 16B is an external side view showing a ceiling fan including
a support base and the stationary blade plates of the ceiling fan.
Fig. 17A is an external perspective view showing a conventional
ceiling fan.
Fig. 17B is an external top view showing the ceiling fan.
Fig. 18A is an external side view showing a principal part of the
ceiling fan.
Fig. 18B is an external side view showing an air flow of the
ceiling fan.
REFERENCE MARKS IN THE DRAWINGS

1 fixed axis
2 stator
3 rotor
4 outer-rotation motor portion
5 blade plate
6 support base
6a holding portion
7 angle changing unit
8 stationary blade holder
8a engaging hole
8b stationary blade protruding portion
8c holding fitting portion
9 stationary blade plate
9a fitting portion
9b thin-wall portion
9c fitting hole
9d thin-plate protruding portion
10 stationary blade driving motor
10a rotation axis
11 eccentric cam
12 round cam
12a long hole portion
13 linkage
13a protruding portion
13b spherical portion
13c necking portion
14 movable plate portion

14a engaging protrusion
14b front end part
14c guide bar
15 pressing spring
15a tip folding portion
15b ring portion
15c rear end folding portion
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Hereinafter, exemplary embodiments of the present invention
are described with reference to drawings. However, the present
invention is not intended to be limited to these exemplary
embodiments.
(FIRST EXEMPLARY EMBODIMENT)
Fig. 1 is a sectional view showing a principal part of a ceiling
fan in accordance with a first exemplary embodiment of the present
invention. Fig. 2 is an external perspective view showing the ceiling
fan. Fig. 3 is an exploded perspective view showing an angle changing
unit of the ceiling fan when a back surface faces upward. Fig. 4 is an
external perspective view showing an angle changing unit of the
ceiling fan when a back surface faces upward. Fig. 5A is an enlarged
view of a principal part showing an operation of a round cam of the
angle changing unit of the ceiling fan. Fig. 5B is an enlarged view of a
principal part showing an operation of a linkage and a stationary blade
plate of the angle changing unit of the ceiling fan. Fig. 6 is a
schematic sectional view showing the linkage of the ceiling fan. Fig. 7
is a sectional view of a principal part showing a relation between the

linkage and a stationary blade holder of the ceiling fan. Fig. 8 is a
view illustrating a relation between the stationary blade plate and a
blade plate of the ceiling fan.
As shown in Figs. 1 to 8, outer-rotation motor portion 4 includes
disk-like stator 2 with a center through which fixed axis 1 passes, and
annular-shaped rotor 3 pivotally supported capable of rotating around
stator 2. A plurality of blade plates 5 are radially arranged on rotor 3.
A support base 6 is detachably fixed around fixed axis 1 in a lower part
of stator 2. An annular-shaped angle changing unit 7 is attached to
the support base 6. Stationary blade holders 8 capable of
elevation/depression rotation are provided to the angle changing unit 7.
Stationary blade plates 9 are detachably placed in the stationary blade
holders 8. An elevation/depression angle of stationary blade plate 9
can be adjusted via stationary blade holder 8 by one stationary blade
driving motor 10 that drives angle changing unit 7.
That is to say, angle changing unit 7 includes eccentric cam 11
pivotally supported by rotation axis 10a of stationary blade driving
motor 10 (see Fig. 3), and annular-shaped round cam 12 rotatably
coupled around fixed axis 1 by eccentric cam 11. Furthermore, angle
changing unit 7 includes a plurality of linkages 13 coupled to round
cam 12 such that they operate together and pivotally supported
rotatably around the horizontal axis, and stationary blade holders 8
that are rotatably provided to be integrated with linkage 13.
Furthermore, protruding portion 13a provided on the outer
peripheral surface of linkage 13 is slidably inserted into long hole
portion 12a provided in round cam 12. As shown in Fig. 6, protruding
portion 13a includes spherical portion 13b on the tip and necking

portion 13c on the foot of spherical portion 13b.
Furthermore, linkage 13 is formed in a lateral cylindrical shape.
Holding portion 6a provided to be integrated with support base 6 is
formed in a lateral hollow cylindrical shape. Linkage 13 is inserted
into holding portion 6a, and thereby the cylindrical-shaped outer
periphery of linkage 13 is rotatably held by hollow cylindrical-shaped
holding portion 6a.
Furthermore, as shown in Fig. 8, each rotation axis R of each
linkage 13 is provided in the direction at same angle a from each
standard line X linking between the center of fixed axis 1 of
outer-rotation motor portion 4 and the tip of each linkage 13.
Note here that angle changing unit 7 to which stationary blade
driving motor 10 is annexed is attached to support base 6. Support
base 6 is detachably provided in the lower part of stator 2,
independently.
According to the above-mentioned configuration, support base 6
is provided around fixed axis 1 and located in the lower part of stator 2,
and the vertical axis of one stationary blade driving motor 10 placed on
support base 6 is coupled to angle changing unit 7. Thus, stationary
blade holders 8 provided on angle changing unit 7 are rotated around
the horizontal axis, so that a plurality of stationary blade plates 9
detachably placed to stationary blade holders 8 can be held in such a
manner in which the angles are changed to the same angle at one time.
Thus, it is possible to adjust the air-blowing speed and the air-blowing
range with a simple structure without using a plurality of gears and
with the small number of components.
By changing the elevation/depression angle of the stationary

blade in this way, it is possible to change the air-blowing range and the
air-blowing speed according to places on which a ceiling fan is set and
conditions of use. Firstly, by increasing the elevation/depression
angle of the stationary blade, a circulation direction component of the
blown air is changed to a downward direction component so as to
narrow the arrival range of blown air. Thus, the arrival range of
blown air is reduced and at the same time the downward air-blowing
speed can be increased. Furthermore, by reducing the angle of the
stationary blade, the arrival range of the blown air is widened so as to
increase the circling direction component. Thus, air current with low
air-blowing speed can be spread through the room.
As shown in Fig. 3, eccentric cam 11 has axis portion 11a
extending to round cam 12 side, and axis portion 11a is movably
inserted and engaged with short hole portion 12b of round cam 12.
Fig. 5A is a view illustrating an operation of round cam 12 seen from
the upper part. Fig. 5B is a view illustrating an operation of linkage
13 seen from the front part. As shown in Fig. 5A, an axial rotation
operation of stationary blade driving motor 10 is converted into a
movement in which round cam 12 moves in a reciprocating circular arc
orbit via axis portion 11a of eccentric cam 11 concentrically with
support base 6 on the horizontal plane at a predetermined angle lit
(the angle is set to 13° in this exemplary embodiment). Long hole
portion 12a formed in round cam 12 moves in the range of angle 12t
(the angle is set to 12.8° in this exemplary embodiment). Linkage 13
having protruding portion 13a slidably engaged with long hole portion
12a is held rotatably around a horizontal axis on the side surface of
support base 6. Therefore, as shown in Fig. 5B, the movement of

linkage 13 is converted into a reciprocating movement around the
horizontal axis at a predetermined angle 13t (the angle is set to 60° in
this exemplary embodiment) in a linked motion with the operation of
round cam 12. Therefore, cylindrical-shaped stationary blade holder
8 fixed to linkage 13 is rotated around the horizontal axis, and is
allowed to be variable in the range of elevation/depression angle 9t
(the angle is set to 60° in this exemplary embodiment) of stationary
blade plate 9.
Furthermore, long hole portion 12a of round cam 12 rotating
concentrically with support base 6 can make a reciprocating movement
while it moves in a circular orbit on the horizontal plane. Protruding
portion 13a of linkage 13 rotating around the horizontal axis on the
side surface of support base 6 is inserted into and engaged with long
hole portion 12a. Therefore, the movement of long hole portion 12a on
the horizontal plane can be converted into a movement of rotating
around the horizontal axis of linkage 13 as a reference.
Herein, as mentioned above, protruding portion 13a of linkage
13 has a shape combining spherical portion 13b and necking portion
13c. Therefore, even when the distance between the horizontal axis
around which linkage 13 rotates and long hole portion 12a of round
cam 12 is slightly displaced, long hole portion 12a of round cam 12 and
protruding portion 13a of linkage 13 are not complicated with each
other and are not firmly engaged with each other. Therefore, linkage
13 can be driven smoothly. Note here that by applying a lubricant
such as silicone grease, linkage 13 can be operated more smoothly.
Furthermore, as shown in Fig. 7, cylindrical-shaped stationary
blade holder 8 to which stationary blade plate 9 is attached supports

the weight of stationary blade plate 9 and the wind pressure load and
the fluctuation load at the time when an angle is changed. However,
since linkage 13 with which stationary blade holder 8 is integrated and
fixed is held by a hollow cylindrical-shaped support base 6 on the outer
peripheral part, and therefore linkage 13 is strongly pivotally
supported rotatably around the horizontal axis at a predetermined
angle. Therefore, the horizontal axis can be maintained horizontally
by suppressing the sagging downward due to the weight of stationary
blade plate 9 and the wind pressure load. At the same time, with
respect to load fluctuation due to the rotation of stationary blade plate
9, the horizontal axis direction and the rotation angle can be
maintained against the fluctuation of the wind pressure. Therefore,
it is possible to surely exhibit the function of changing the wind
direction by stationary blade plate 9.
Furthermore, a plurality of blade plates 5 are radially arranged
at an equal angle around the vertical central axis of outer-rotation
motor portion 4. However, rotation axis R of linkage 13 supporting
stationary blade plate 9 is provided in a direction at same angle a from
each standard line X linking between the center of fixed axis 1 of
outer-rotation motor portion 4 and the tip of linkage 13. Thus,
regardless of the rotation positions of blade plate 5, stationary blade
plates 9 can be disposed so that they are not overlapped with portions
located right under blade plates 5. Therefore, it is possible to
suppress the rapid pressure change by the interference by stationary
blade plate 9 that is adjacent to blade plate 5, and it is possible to
achieve a quiet air-blowing operation with less occurrence of vibration
or noise.

Furthermore, when angle changing unit 7 is added as an option
to the lower part of the ceiling fan main body, it can be added and
assembled even in a state in which the main body is attached to the
ceiling. Furthermore, when it is exchanged with another option such
as a light unit, a large-scale installation operation is not needed, and it
can be carried out by a simple exchanging operation.
(SECOND EXEMPLARY EMBODIMENT)
Fig. 9 is an exploded perspective view showing a relation
between a stationary blade plate and a movable plate portion in
accordance with a second exemplary embodiment of the present
invention. Fig. 10 is a sectional view of a principal part in assembly
of a stationary blade holder and the stationary blade plate of the
ceiling fan. Fig. HA is an external perspective view before assembly
of the stationary blade holder and the stationary blade plate of the
ceiling fan. Fig. 11B is an external perspective view during assembly
of the stationary blade holder and the stationary blade plate of the
ceiling fan. Fig. 11C is an external perspective view after assembly of
the stationary blade holder and the stationary blade plate of the
ceiling fan. Fig. 12 is a sectional view of a principal part showing a
state of a pressing spring when the stationary blade plate of the ceiling
fan is assembled. Fig. 13 is a bottom view showing a relation between
the total length of the blade plate and the total length of the stationary
blade plate of the ceiling fan. Fig. 14 is an external perspective view
of the stationary blade plate of the ceiling fan. Fig. 15 is an external
side view of the stationary blade plate of the ceiling fan. Fig. 16A is
an external side view showing a ceiling fan without including a support

base of the ceiling fan. Fig. 16B is an external side view showing a
ceiling fan including a support base and the stationary blade plates of
the ceiling fan. Note here that Figs. 9 to 12, 14 and 15 are shown with
upside down for the convenience of description.
As shown in Figs. 9 to 16B, in this exemplary embodiment,
fitting portion 9a to which stationary blade holder 8 is engageably and
detachably placed is provided on the root portion of stationary blade
plate 9. In the upper part of fitting portion 9a of stationary blade
plate 9, movable plate portion 14 and pressing spring 15 are provided.
Movable plate portion 14 is pivotally supported rotatably from the
horizontal direction to the elevation angle direction; and pressing
spring 15 biases movable plate portion 14 to fitting portion 9a side.
Engaging protrusion 14a provided on the back surface of movable plate
portion 14 is allowed to slide while it is biased to the outer peripheral
surface of stationary blade holder 8 in a state in which it penetrates
into fitting hole of fitting portion 9a, and then engaging protrusion 14a
can be fitted into engaging hole portion 8a provided in stationary blade
holder 8.
Furthermore, pressing spring 15 for pressing movable plate
portion 14 pivotally supported rotatably on stationary blade plate 9
has tip folding portion 15a processed in a ring shape. When tip
folding portion 15a is located on front end part 14b of movable plate
portion 14, and stationary blade plate 9 is placed in stationary blade
holder 8, tip folding portion 15a can be engaged with stationary blade
protruding portion 8b provided on stationary blade holder 8.
Furthermore, the tip position of stationary blade plate 9 is
provided concentrically with blade plate 5 such that it falls in between

60% to 90% of the total length of blade plate 5. The cross sectional
shape of thin-wall portion 9b of stationary blade plate 9 is a circular
arc shape that is convex downward. The thickness dimension of
thin-wall portion 9b is reduced sequentially at the tip side of
stationary blade plate 9.
Furthermore, as shown in Fig. 12, ring portion 15b of pressing
spring 15 is fitted into guide bar 14c that is an axis of the rotation of
movable plate portion 14. Along with this, fitting protrusion 14a of
movable plate portion 14 is detachably placed on engaging hole portion
8a provided on holding fitting portion 8c of stationary blade holder 8.
Tip folding portion 15a provided on the tip of pressing spring 15 is
engageably provided on stationary blade protruding portion 8b of
stationary blade holder 8, and rear end folding portion 15c provided on
the rear end of pressing spring 15 is engaged with thin-plate
protruding portion 9d.
With the above-mentioned configuration, holding fitting portion
8c of stationary blade holder 8 and fitting portion 9a of stationary
blade plate 9 are detachably fitted to each other. Movable plate
portion 14, which is pivotally supported rotatably only in the elevation
angle direction, is provided in the upper part of fitting portion 9a of
stationary blade plate 9. Engaging protrusion 14a provided on the
back side of movable plate portion 14 is always pressed onto holding
fitting portion 8c of stationary blade holder 8 by pressing spring 15
(Fig. 11A). Therefore, when a hollow cylindrical shape portion (fitting
portion 9a) of stationary blade plate 9 is fitted into holding fitting
portion 8c of stationary blade holder 8, engaging protrusion 14a of
movable plate portion 14 advances while it is brought into contact with

and pushed up by the surface of holding fitting portion 8c of stationary
blade holder 8 (Fig. 11B). Thereafter, finally, engaging protrusion 14a
is fitted into and placed in engaging hole portion 8a of stationary blade
holder 8, so that the fitting force is maintained by pressing spring 15.
Therefore, it is possible to confirm by the feel that stationary blade
plate 9 is securely placed on a predetermined position and it is possible
to maintain the placed stationary blade plate 9 and to prevent it from
dropping off (Fig. 11C).
Furthermore, pressing spring 15 is set on movable plate portion
14 that is rotatably set on stationary blade plate 9. Rear end folding
portion 15c that is provided on one end of pressing spring 15 is engaged
with thin-plate protruding portion 9d provided on the thin plate
portion of stationary blade plate 9 (Fig. 11A). Therefore, tip folding
portion 15a provided on the other end of pressing spring 15 advances
while engaging protrusion 14a of movable plate portion 14 is lifted up
by holding fitting portion 8c of stationary blade holder 8 when
stationary blade plate 9 is placed on stationary blade holder 8 (Fig.
11B). Furthermore, when engaging protrusion 14a of movable plate
portion 14 is fitted into engaging hole portion 8a, tip folding portion
15a on the other end of pressing spring 15 fixed to movable plate
portion 14 is also engaged with stationary blade protruding portion 8b
of stationary blade holder 8 simultaneously. Therefore, thin plate
portion 9b of stationary blade plate 9 and stationary blade protruding
portion 8b of stationary blade holder 8 are coupled to each other by
pressing spring 15 (Fig. 11C). Thus, when stationary blade plate 9 is
broken, the thin plate portion can be prevented from dropping off.
Furthermore, as shown in Fig. 13, from the vicinity of the center

part of blade plate 5 to the middle at the outer peripheral side of the
ceiling fan, the blade efficiency is good. Specifically, in 60% to 90% of
total diameter B of the moving blade, the air blowing efficiency is good,
and especially, in around 75%, the best air blowing efficiency can be
achieved. Therefore, total diameter A of the stationary blade is set so
that stationary blade plate 9 falls in the range in which the air blowing
efficiency of blade plate is good. Furthermore, as shown in Fig. 15,
the cross-sectional shape of thin-wall portion 9b of stationary blade
plate 9 is made to be a circular shape that is convex downward and
receives a load of blown air of the blade plate. Thus, it is possible to
efficiently change the direction of blowing air while the strength is
kept so that stationary blade plate 9 does not bend. Furthermore, the
thickness dimension of thin-wall portion 9b is reduced sequentially at
the tip side of stationary blade plate 9, thereby reducing the gravity
load to bending.
Furthermore, since guide bar 14c provided on movable plate
portion 14 can function as an axis of rotation of movable plate portion
14 and a fulcrum of pressing spring 15, the configuration of movable
plate portion 14 can be simplified and the number of components can
be reduced. Along with this, when stationary blade plate 9 is placed
to stationary blade holder 8, tip folding portion 15a of pressing spring
15 is fitted to stationary blade protruding portion 8b of stationary
blade holder 8, and rear end folding portion 15c of pressing spring 15 is
engaged with thin-plate protruding portion 9d. Therefore, when
break occurs between the root portion of stationary blade plate 9 and
the thin plate portion, or when movable plate portion 14 is broken and
detached, stationary blade plate 9 is coupled to stationary blade holder

8 by pressing spring 15 and can be held without dropping off.
Therefore, dropping of stationary blade plate 9 is prevented in advance
and safety can be secured.
Fig. 16A shows a ceiling fan in a state in which angle changing
unit 7 is removed. Fig. 16B shows a state in which support base 6
onto which angle changing unit 7 is placed is attached to the lower part
of stator 2. Support base 6 and stator 2 can be connected to each
other by using any engaging mechanism such as an engaging claw.
In this way, this exemplary embodiment has a configuration in
which angle changing unit 7 is detachably provided independently in
the lower part of stator 2. According to this configuration, when angle
changing unit 7 is added as an option to the lower part of the ceiling
fan main body, it can be added and assembled in a state in which the
main body is set on the ceiling. Furthermore, when it is exchanged
with another option such as a lighting unit, large scale installation
work is not necessary. An exchange operation can be carried out by a
simple operation.
Note here that in the above-mentioned exemplary embodiment,
a case including one stationary blade driving motor is described.
However, the stationary blade driving motor is not necessarily limited
to one, and two or three stationary blade driving motors can be used.
However, when one stationary blade driving motor is used, the effect of
reducing the number of components becomes the maximum.
As described above, the present invention includes an
outer-rotation motor portion composed of a disk-like stator with a
center through which a fixed axis passes, and an annular-shaped rotor
pivotally supported capable of rotating around the stator.

Furthermore, the present invention includes a plurality of blade plates
that are radially arranged on the rotor, and a support base provided
around the fixed axis in the lower part of the stator. Furthermore, the
present invention includes an annular-shaped angle changing unit
provided on the support base, and a plurality of stationary blade plates
that are detachably placed on a stationary blade holder provided on the
angle changing unit. Furthermore, in the present invention, the
elevation/depression angle of a stationary blade plate can be adjusted
by one stationary blade driving motor for driving the angle changing
unit.
According to this configuration, a support base is provided
around the fixed axis in a lower part of the stator, and a vertical axis of
one stationary blade driving motor placed on this support base can be
coupled to the angle changing unit. Thus, a stationary blade holder
provided on the angle changing unit is rotatably operated around the
horizontal axis, and a plurality of stationary blade plates detachably
placed on the stationary blade holder can be held by changing to the
same angle at one time. Therefore, it is possible to adjust the
air-blowing speed and the air-blowing range by a simple structure
whose number of components is small. That is to say, by changing the
elevation/depression angle of the stationary blade, it is possible to
change the air-blowing range and the air-blowing speed according to
places on which a ceiling fan is set and conditions of use. Firstly, by
increasing the elevation/depression angle of the stationary blade, a
circulation direction component of the blown air is changed to a
downward direction component so as to narrow the arrival range of
blown air. Thus, the arrival range of blown air is reduced and at the

same time the downward air-blowing speed can be increased.
Furthermore, by reducing the angle of the stationary blade, the arrival
range of the blown air is widened so as to increase the circling
direction component. Thus, air current with low air-blowing speed
can be spread through the room.
Furthermore, in the present invention, an angle changing unit
includes an eccentric cam pivotally supported by the rotation axis of
the stationary blade driving motor, an annular-shaped round cam
coupled rotatably around the fixed axis by the eccentric cam, a
plurality of linkages coupled in a manner in which it operates together
with the round cam and pivotally supported rotatably around the
horizontal axis, and stationary blade holders rotatably provided to be
integrated with the linkages.
According to this configuration, an axial rotation operation of
the stationary blade driving motor is converted into a movement in
which a round cam moves concentrically with the support base in a
reciprocating circular orbit at a predetermined angle on the horizontal
plane via an eccentric cam. Since a linkage having a protruding
portion that is slidably engaged with a long hole portion disposed in
the round cam is held on the side surface of the support base around
the horizontal axis, the movement of the linkage is converted into a
reciprocating movement at the certain angle around a horizontal axis
together with the operation of the round cam. Therefore, a
cylindrical-shaped stationary blade holder fixed to the linkage is
rotated around the horizontal axis, and the elevation/depression angle
of the stationary blade plate can be made to be variable.
Furthermore, in the present invention, a protruding portion

provided on the outer peripheral surface of the linkage is slidably
inserted into an engaging hole portion provided in the round cam.
The protruding portion has a spherical portion on the tip, and a
necking portion on the root portion of this spherical portion.
With such a configuration, the long hole portion of the round
cam rotating concentrically with the support base makes a
reciprocating movement while it moves in a circular orbit on the
horizontal plane. On the side surface of the support base, a
protruding portion of the linkage rotating around the horizontal axis
moves in an orbit rotating around a horizontal axis as a reference on
the vertical plane. The protruding portion of the linkage composed of
a spherical portion and a necking portion coincides with the long hole
portion in the round cam. Therefore, even if the distance between
centers of the horizontal axis around which the linkage rotates and the
round cam is slightly displaced, the long hole portion of the round cam
and the protruding portion of the linkage are prevented from being
firmly engaged with each other, and smooth driving can be carried out.
Furthermore, in the present invention, a linkage is formed in a
lateral cylindrical shape and a holding portion provided to be
integrated with the support base is formed in a hollow cylindrical
shape that is rotatably held on the periphery of the linkage.
According to this configuration, the cylindrical-shaped
stationary blade holder to which the stationary blade plate is attached
supports the weight of the stationary blade plate, the wind pressure
load, and the fluctuation load when an angle is changed. However,
the linkage fixed together with the stationary blade holder having a
hollow cylindrical shape is held by support base at the outer peripheral

part thereof and strongly pivotally supported rotatably around the
horizontal axis at a predetermined angle. Therefore, it is possible to
maintain the horizontal axis horizontally by suppressing the sagging
downward against the weight of the stationary blade plate and the
wind pressure load. Furthermore, it is possible to maintain the
horizontal axis direction and a rotation angle against the load
fluctuation due to the rotation of the stationary blade plate and
against the fluctuation of wind pressure. Therefore, it is possible to
securely exhibit a function of changing the wind direction by the
stationary blade plate.
Furthermore, the present invention has a configuration in
which each rotation axis of the linkage is provided in the direction at
the same angle from each standard line that links between a center of
the fixed axis of the outer-rotation motor portion and the tip of each
linkage.
With this configuration, a plurality of blade plates are radially
arranged at an equal angle around the vertical central axis of the
outer-rotation motor portion. However, the rotation axis of the
linkage supporting the stationary blade plate is provided in the
direction at the same angle a from each standard line X linking
between the center of the fixed axis of the outer-rotation motor portion
and the tip of the linkage. Therefore, regardless of the rotation
positions of the blade plates, the stationary blade plates are not
overlapped with the blade plates located below. Therefore, it is
possible to suppress a rapid pressure fluctuation due to the
interference of the stationary blade plates adjacent to the blade plates,
and therefore it is possible to achieve a quiet air-blowing motion with

vibration and noise reduced.
Furthermore, the present invention has a configuration in
which a fitting portion to which the stationary blade holder is
engageably and detachably placed is provided on the root portion of the
stationary blade plate; and a movable plate portion pivotally supported
that is rotatably from the horizontal direction to the elevation angle
direction, and a pressing spring that biases the movable plate portion
to the fitting portion side are provided in the upper part of the fitting
portion of the stationary blade plate. In the configuration, an
engaging protrusion provided on the back surface of the movable plate
portion is biased to the outer peripheral surface of the stationary blade
holder and allowed to slide, and then the engaging protrusion can be
fitted into the engaging hole provided on the stationary blade holder in
a state in which it is pressed.
According to this configuration, a holding fitting portion of the
stationary blade holder and a fitting portion (hollow cylindrical-shape
portion) on the root portion of the stationary blade plate are
detachably fitted to each other. Furthermore, a movable plate portion
pivotally supported rotatably only in the direction of the elevation
angle is provided in the upper part of the fitting portion of the
stationary blade plate. The engaging protrusion provided on the rear
side of the movable plate portion is always pressed to the holding
fitting portion of the stationary blade holder by the pressing spring.
Therefore, when a fitting portion (hollow cylindrical-shaped portion) of
the stationary blade plate is fitted into the holding fitting portion of
the stationary blade holder, an engaging protrusion of the movable
plate portion is allowed to advance while it is brought into close

contact with and pushed up by the surface of the holding fitting portion
of the stationary blade holder. Finally, the engaging protrusion is
fitted into the engaging hole of the stationary blade holder and placed
thereon, and a fitting force is maintained by the pressing spring.
Therefore, it is possible to confirm by the feel that the stationary blade
plate is securely placed on a predetermined position. Furthermore, it
is possible to hold the placed stationary blade plate so that it does not
drop off.
Furthermore, in the present invention, the pressing spring
includes a ring-shaped tip folding portion on the tip, and this tip
folding portion is disposed on the front end part of the movable plate
portion. When the stationary blade plate is placed on the stationary
blade holder, the tip folding portion can be engaged with the stationary
blade protruding portion provided on the stationary blade holder.
With this configuration, the pressing spring is set in the
movable plate portion that is rotatably set on the stationary blade
plate. A rear end folding portion provided on one end of the pressing
spring is engaged with a thin-plate protruding portion provided on a
thin plate portion of the stationary blade plate. A tip folding portion
provided on the other end of the pressing spring advances in a state in
which the engaging protrusion of the movable plate portion is lifted by
the holding fitting portion when the stationary blade plate is placed on
the stationary blade holder. Furthermore, when the engaging
protrusion is fitted into the engaging hole, a tip folding portion on the
other end of the pressing spring fixed to the movable plate portion is
engaged with the thin-plate protruding portion of the stationary blade
holder simultaneously. Therefore, the thin plate portion of the

stationary blade plate and the stationary blade protruding portion of
the stationary blade holder are coupled to each other by the pressing
spring. Thus, it is possible to prevent the thin plate from dropping off
when the stationary blade plate is broken.
Furthermore, in the present invention, the tip position of the
stationary blade plate is provided at the tip side of the blade plate and
in a concentric circle in 60% to 90% of the total length of the blade
plate. The cross-sectional shape of the thin-wall portion of the
stationary blade plate has an arc shape that is convex downward, and
the thickness dimension of the thin-wall portion is reduced in the tip
side of the stationary blade plate.
According to this configuration, the blade plate of the ceiling
fan exhibits good blade efficiency from the vicinity of the center to the
middle to the outer periphery side of the total length of the blade.
Specifically, the air blowing efficiency is good in 60% to 90% of the total
length of the blade plate. In particular, the air blowing efficiency is
the best in about 75%. Therefore, the total length is set so that the
stationary blade plate falls in this range of the air blowing efficiency of
the blade plate, and a cross-sectional shape of the thin-wall portion of
the stationary blade plate has an arc shape that is convex downward
and receives an air-blowing load of the blade plate. Thus, the blowing
air direction can be changed efficiently while the strength is
maintained so that the stationary blade plate does not bend.
Furthermore, by reducing the thickness dimension of the thin-wall
portion at the tip side of the stationary blade plate, it is possible to
reduce the gravity load to bending.
Furthermore, the present invention has a configuration in

which a ring portion provided in the pressing spring is fitted into a
guide bar that is an axis of rotation of the movable plate portion; an
engaging protrusion provided on the movable plate portion is
detachably placed to the engaging hole provided in the stationary
blade holder! as well as a tip folding portion of the pressing spring is
provided in the stationary blade protruding portion capable of being
engaged, and a rear end folding portion provided on the rear end of the
pressing spring is engaged with a thin-plate protruding portion
provided in the stationary blade holder.
According to this configuration, the guide bar provided on the
movable plate portion can function as an axis of rotation of the
movable plate portion and a fulcrum of the pressing spring, thus
simplifying the movable plate portion and reducing the number of
components. Furthermore, when the stationary blade plate is placed
on the stationary blade holder, the tip folding portion of the pressing
spring is fitted to the stationary blade protruding portion, and the rear
end folding portion of the pressing spring is engaged with the
thin-plate protruding portion. Therefore, even if the stationary blade
plate is broken in a portion between the root portion and the thin plate
portion of the stationary blade plate, or when the movable plate
portion is broken, the stationary blade plate can be held because it is
coupled to the stationary blade holder by the pressing spring and it
does not drop off. Therefore, it is possible to secure the safety by
preventing dropping of the stationary blade plate.
Furthermore, the present invention has a configuration in
which an angle changing unit and a support base provided with the
angle changing unit are detachably provided in the lower part of the

stator.
According to this configuration, when an angle changing unit is
added as an option in the lower part of the ceiling fan main body, the
unit can be added and assembled even in a state in which the main
body is set on the ceiling. Furthermore, when it is exchanged with the
other option such as a light unit, large-scale setting construction is not
required, and it can be carried out by a simple exchange work.
INDUSTRIAL APPLICABILITY
The present invention is suitable for a ceiling fan and the like,
since an air-blowing speed and an air-blowing range can be adjusted
with a small number of components and with a simple structure.

We Claim:
1. A ceiling fan comprising:
an outer-rotation motor portion including a disk-like stator with
a center through which a fixed axis passes, and an annular-shaped
rotor pivotally supported capable of rotating around the stator;
a plurality of blade plates radially arranged on the rotor;
a support base having the fixed axis in a center of thereof and
located in a lower part of the stator;
an annular-shaped angle changing unit provided on the support
base; and
a plurality of stationary blade plates being detachably placed on
stationary blade holders provided on the angle changing unit;
wherein an elevation/depression angle of the stationary blade
plates is adjustable by at least one stationary blade driving motor that
drives the angle changing unit.
2. The ceiling fan of claim 1,
wherein the angle changing unit comprises an eccentric cam
pivotally supported by a rotation axis of the stationary blade driving
motor, and
an annular-shaped round cam coupled rotatably around the
fixed axis by the eccentric cam,
a plurality of linkages coupled to the round cam so that they
move together and pivotally supported rotatably around a horizontal
axis, and
stationary blade holders rotatably provided to be integrated

with the linkages.
3. The ceiling fan of claim 2,
wherein a protruding portion provided on an outer peripheral
surface of the linkage is slidably inserted into a long hole portion
provided in the round cam, and the protruding portion includes a
spherical portion at a tip and a necking portion on a root of the
spherical portion.
4. The ceiling fan of claim 2,
wherein the linkage is formed in a lateral cylindrical shape, and
a holding portion provided to be integrated with the support base is a
hollow cylindrical shape rotatably holding the periphery of the linkage.
5. The ceiling fan of claim 2,
wherein each rotation axis of the linkage is provided in a
direction at a same angle from each standard line that links between a
center of the fixed axis and each tip of the linkage.
6. The ceiling fan of claim 1,
wherein a fitting portion to which the stationary blade holder is
placed engageably and detachably is provided on a root portion of the
stationary blade plate,
a movable plate portion pivotally supported rotatably from a
horizontal direction to a direction of an elevation angle and a pressing
spring for biasing the movable plate portion to the fitting portion side
are provided in an upper part of the fitting portion, and

an engaging protrusion provided on a back surface of the
movable plate portion is biased to an outer peripheral surface of the
stationary blade holder and allowed to slide, and then is made to be
capable of being fitted in a state in which the engaging protrusion is
pressed into an engaging hole provided in the stationary blade holder.
7. The ceiling fan of claim 6,
wherein the pressing spring has a ring-shaped tip folding
portion on a tip,
when the tip folding portion is located on the front end part of
the movable plate portion and the stationary blade plate is placed on
the stationary blade holder, the tip folding portion is allowed to be
engaged with the stationary blade protruding portion provided on the
stationary blade holder.
8. The ceiling fan of claim 6,
wherein a tip position of the stationary blade plate is provided
concentrically on a tip side of the blade plate and in a portion between
60% to 90% of a total length of the blade plate;
a cross sectional shape of a thin-wall portion of the stationary
blade plate has an arc shape that is convex downward; and
a thickness dimension of the thin-wall portion is sequentially
reduced at a tip side of the stationary blade plate.
9. The ceiling fan of claim 6,
wherein a ring portion provided on the pressing spring is fitted
into a guide bar that is an axis of rotation of the movable plate portion,

the engaging protrusion provided on the movable plate portion is
detachably placed in the engaging hole provided in the stationary
blade holder, a tip folding portion of the pressing spring is provided in
the stationary blade protruding portion capable of being engaged, a
rear end folding portion provided on a rear end of the pressing spring is
engaged with a thin-plate protruding portion provided in the
stationary blade plate.
10. The ceiling fan of claim 1,
wherein the angle changing unit, and the support base provided
with the angle changing unit are detachably provided in a lower part of
the stator.

A configuration including outer-rotation motor portion (4)
including stator (2) with a center through which fixed axis (1) passes,
and rotor (3) pivotally supported capable of rotating around stator (2);
a plurality of blade plates (5) radially arranged on rotor (3); support
base (6) having fixed axis (1) in a center thereof and located in a lower
part of stator (2); angle changing unit (7) provided on support base (6);
and a plurality of stationary blade plates (9) being detachably placed
on stationary blade holders provided on angle changing unit (7). With
the configuration in which an elevation/depression angle of stationary
blade plates (9) is adjustable by at least one stationary blade driving
motor (10) that drives angle changing unit (7), a structure is
simplified.