JP3501326B2 - Ventilation fan - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan which opens and closes an intake port as a lid moves.

[0002]

A conventional structure of the ventilation fan will be described with reference to FIG. A drive source 2 composed of a pressing body 1 and a motor is housed inside the ventilating fan main body. When the control wire 2a is pulled in the direction of arrow A along with the operation of the drive source 2, the pressing body 1 moves around the shaft portion 1a. On arrow B
Rotate in the direction. Then, the sliding portion 3a of the lid body 3 is pressed by the pressing body 1, and the lid body 3 moves in the arrow C direction (opening direction) as indicated by the chain double-dashed line. As a result, the intake port of the ventilation fan body is opened.

In the case of the above construction, the urging member 4 composed of a tension coil spring is hung between the sliding portion 3a and a predetermined fixed portion, and urges when the lid 3 moves in the direction of arrow C. The member 4 expands, and as shown in FIG. 13, the closing force acting on the lid 3 in the arrow A direction (closing direction) gradually increases. Therefore, in order to open the intake port, it is necessary to press the lid body 3 with a large force in the direction of the arrow C, and thus it is necessary to use the high-output drive source 2.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a ventilation fan that can use a low-output drive source.

[0005]

Means for Solving the Problems The ventilating fan according to claim 1 is a ventilating fan body for discharging from the exhaust port by sucking the intake and exhaust air in the closed and chamber from the intake port, provided on the ventilating fan body et Re before serial lid that is movable in the opening direction and occlusion closing direction to open the air inlet, biasing for closing said intake port to urge the lid to the closed direction by the wake I該 lid A member, a drive source that moves the lid in the opening direction against the biasing force of the biasing member, an auxiliary member that biases the lid in the opening direction when the intake port is opened, and a shaft portion
The transmission arm part and the pressing arm part are provided on both sides of the front
The driving force of the driving source is transmitted to the transmission arm section.
And a pressing body that rotates in the positive direction around the shaft portion.
The pressing arm of the pressing body is square in shape.
The cover is pushed and moved in the opening direction as it rotates in the direction
The one end portion of the auxiliary member with respect to the shaft portion of the pressing body.
And the other end is attached to the pressing body.
The feature is that it consists of a tension coil spring hooked .

According to the above means, when the drive source is activated,
The lid moves in the opening direction against the urging force of the urging member, and the intake port of the ventilation fan main body is opened. In this case, the auxiliary member urges the lid body in the opening direction at the time of opening when the closing force acting on the lid body from the urging member becomes maximum. For this reason, the closing force acting on the lid is weakened, so that a low-output drive source can be used. Moreover, unlike the case where the biasing member having a small spring force is used, the closing force that acts on the lid is maintained at a predetermined level, so that there is no fear of impairing the smooth movement of the lid in the closing direction. Also, the pressing arm of the pressing body
Is a line of action (the end of the tension coil spring and the shaft of the pressing body
(A straight line connecting the
Is urged in the opposite direction to strengthen the closing force acting on the lid. Well
If the pressing arm of the pressing body exceeds the line of action, the tension coil
The il spring urges the pressing body in the forward direction and acts on the lid to close it.
Weaken force. For this reason, mainly tension coil springs
A small and inexpensive toggle mechanism that acts on the lid.
Is almost constant at a predetermined level, driving at even lower output
Source and the space and
It is advantageous on both sides of strike.

[0007]

[0008]

[0009]

A ventilation fan according to a second aspect of the present invention is characterized in that one end portion of the tension coil spring is arranged on the side of the pressing arm portion and the transmission arm portion of the pressing body that has a longer dimension. According to the above means, even if the mounting position of one end of the tension coil spring is deviated, the angle of the line of action does not largely deviate, so that a large change in the rotational force applied from the tension coil spring to the pressing body is prevented. It At the same time, since the length of the tension coil spring is reduced, the device becomes compact.

The ventilating fan according to claim 3 is provided with an engaging member that engages with the tension coil spring and expands the tension coil spring when the amount of rotation of the pressing body in the positive direction exceeds a predetermined value. It has characteristics. According to the above means, when the amount of rotation of the pressing body in the positive direction exceeds the predetermined value and the tension coil spring engages with the engaging member, the tension coil spring expands and biases the pressing body in the positive direction. Therefore, the tension coil spring becomes closer to the free state, and the closing force acting on the lid body from the tension coil spring is prevented from exceeding a predetermined level.

A ventilation fan according to a fourth aspect of the present invention includes an intake port and an exhaust port.
It has an air outlet and sucks the air in the room from the intake port and then from the exhaust port.
The exhaust fan main body to be discharged, and the exhaust fan main body provided with the above
Move to the opening direction to open the intake port and the closing direction to close it.
Movable lid and urging this lid toward the closing direction
Accordingly, a biasing member that closes the intake port with the lid,
Move the cover body in the opening direction against the biasing force of the biasing member.
Drive source and the lid is opened when the intake port is opened.
An auxiliary member for urging the direction release, mainly the accompanying shaft portion to which the driving force of the driving Re et al provided the transmission arm portion and the pressing arm portion on both sides of the shaft portion Dogen is transmitted to the transmission arm forward to a pressing member which rotates, the pressing body is pressed and moved the pressure arm portion lid Ban I該 pressing body to rotate in the forward direction to the opening direction, the auxiliary member is a plate spring, one end portion of the leaf spring has a characteristic where the other end hooked to a fixed portion eccentric to the axis of the pressing member is hooked on the pressing member.

According to the above means, when the pressing arm portion of the pressing body reaches the line of action (the straight line connecting the one end of the leaf spring and the shaft portion of the pressing body), the leaf spring acts on the pressing body. The direction of the biasing force is reversed. For this reason, the closing mechanism acting on the lid is made substantially constant to a predetermined level by the small and inexpensive toggle mechanism mainly composed of the leaf springs, so that it becomes possible to use a drive source with a lower output, It is advantageous in terms of space and cost.

The ventilating fan according to claim 5 has an intake port and an exhaust port.
It has an air outlet and sucks the air in the room from the intake port and then from the exhaust port.
The exhaust fan main body to be discharged, and the exhaust fan main body provided with the above
Move to the opening direction to open the intake port and the closing direction to close it.
Movable lid and urging this lid toward the closing direction
Accordingly, a biasing member that closes the intake port with the lid,
Move the cover body in the opening direction against the biasing force of the biasing member.
Drive source and the lid is opened when the intake port is opened.
An auxiliary member for urging the direction release, mainly the accompanying shaft portion to which the driving force of the driving Re et al provided the transmission arm portion and the pressing arm portion on both sides of the shaft portion Dogen is transmitted to the transmission arm forward and a pressing member which rotates to, the pressing arm portion of that pressing body rotates in the positive direction accompanied I該 pressing body is pressed against moving the lid in the opening direction, the auxiliary member via a press plate It is characterized by being composed of a compression coil spring that presses the pressing arm portion of the pressing body.

According to the above means, the direction of the urging force acting on the pressing body from the compression coil spring via the pressing plate is reversed, with the pressing arm portion of the pressing body being perpendicular to the pressing plate. Become. For this reason, the small and inexpensive toggle mechanism mainly composed of the compression coil spring makes the closing force acting on the lid substantially constant at a predetermined level, so that it becomes possible to use a drive source with a lower output. It is advantageous in terms of space and cost.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will now be described with reference to FIG.
Or, it demonstrates based on FIG. First, in FIG.
A communication hole 11a is formed in the chamber wall 11 to establish communication between the inside and the outside of the room, and a body frame 12 is mounted in the communication hole 11a. The main body frame 12 has a rectangular box shape (see FIG. 4), and the main body frame 12 has an exhaust port 12 a formed outside and an opening 12 b formed inside. ing.

A decorative frame 13 is attached to the body frame 12 at the indoor side. An intake port 13a is formed in the center of the decorative frame 13, and the inside of the main body frame 12 communicates with the room through the opening 12b and the intake port 13a.

A plurality of bosses 13 are provided at both ends of the decorative frame 13.
b is provided, and the boss portion 13b of each set has a cylindrical body 14
Is screwed on. Further, the decorative plate 15 corresponds to a lid, and the sliding parts 15a are provided at both ends of the decorative plate 15.
Is provided. And, each of these sliding parts 15a
As shown in FIG. 1, it is movably inserted into the cylindrical body 14.

A return spring 16 corresponding to an urging member is hung between the cylindrical body 14 and the sliding portion 15a of each set. Each of these return springs 16 is composed of a tension coil spring, and as the sliding portion 15a is pulled in the direction of arrow A (closing direction), as shown by the solid line in FIG.
The peripheral portion of 5 is brought into contact with the decorative frame 13. As a result, the decorative plate 15 closes the intake port 13a of the decorative frame 13.

The pressing body 17 shown in FIG. 4 is formed by bending a metal wire rod, and has a U-shaped transmission arm portion 17a located at the center and linear transmission arms located on both sides of the transmission arm portion 17a. Each of the shaft portions 17b has an L-shaped pressing arm portion 17c located at the end of each shaft portion 17b.
Support plates 18 are provided at both ends of the body frame 12, and the shaft portions 17b of the pressing bodies 17 are rotatably supported by the support plates 18.

As shown in FIG. 1, a hoisting motor 19 corresponding to a drive source is provided in the main body frame 12. This hoisting motor 19 has a built-in reduction gear mechanism composed of a plurality of gears. One end of a control wire 19a is connected to the rotating shaft of the hoisting motor 19, and the other end of the control wire 19a is pressed by a pressing body 17. Is rotatably connected to the transmission arm portion 17a.

Therefore, when the hoisting motor 19 is actuated and the control wire 19a is pulled in the direction of arrow A, the pulling force is transmitted to the transmission arm portion 17a, so that the pressing body 17 moves in the direction of arrow B around both shaft portions 17b. Rotate. Then, since each pressing arm portion 17c of the pressing body 17 presses the sliding portion 15a of the decorative plate 15, the sliding portion 15a slides in the arrow C direction (opening direction) against the spring force of the return spring 16. To do. As a result, as shown by the chain double-dashed line, the decorative plate 15 has the arrow C.
And the intake port 13a of the decorative frame 13 is opened.

The closing force (returning force in the direction of arrow A) acting on the decorative plate 15 from the return spring 16 causes the decorative plate 15 to move in the direction of arrow C as indicated by the solid line (a) in FIG. It grows as you move.

Each pressing arm portion 17c of the pressing body 17 has
As shown in FIG. 1, the upper end of the auxiliary spring 20 is hooked. Each of these auxiliary springs 20 corresponds to an auxiliary member and is composed of a tension coil spring. Further, two hook portions 20a are provided in the body frame 12 (only one is shown). Each of these hook portions 20a is
The lower side of both shaft portions 17b of the pressing body 17 (transmission arm portion 17a
The lower end of the auxiliary spring 20 is hooked on each hook 20a.

The pressing body 17 and the auxiliary spring 20 constitute a toggle mechanism, and each pressing arm portion 17c of the pressing body 17 is in the arrow A direction of the line of action B (the straight line connecting the hooking portion 20a and the shaft portion 17b). When it is located on the side, the turning force in the direction of arrow D acts on the pressing body 17 from each auxiliary spring 20, and the turning force in the closing direction is as shown by the solid line C in FIG. , And decreases as the pressing body 17 rotates in the direction of arrow B.

Further, each pressing arm portion 17c of the pressing body 17
Moves to the arrow C direction side of the line of action B, each auxiliary spring 2
From 0, the turning force in the direction of arrow B acts on the pressing body 17, and the turning force in the opening direction causes the pressing body 17 to rotate in the direction of arrow B as shown by the solid line C in FIG. Increase as you do. Therefore, as shown by the solid line D in FIG. 2B, a substantially constant closing force, which is a combination of the spring force of the return spring 16 and the turning force of the pressing body 17, acts on the decorative plate 15.

As shown in FIG. 3, a motor support plate 21 is provided in the main body frame 12, and the motor support plate 2 is provided.
1, the fan motor 22a of the fan device 22 is attached, and the fan 22b of the fan device 22 is attached to the rotating shaft of the fan motor 22a. And the body frame 12
A bell mouth 23 is provided inside, and when the fan motor 22a operates with the decorative plate 15 open, the decorative frame 1
3 through the bell mouth 23 from the intake port 13a of the main body frame 1
Air is sucked into the inside of the chamber 2 and discharged to the outside through the exhaust port 12a. Incidentally, reference numeral 24 is a main body frame 12, a decorative frame 13,
3 illustrates a ventilation fan body including a fan device 22.

Next, the operation of the above configuration will be described. In the stopped state of the ventilation operation, the fan motor 22a and the hoisting motor 19 are cut off. Therefore, the decorative plate 15 contacts the decorative frame 13 by the spring force of the return spring 16 and closes the intake port 13a. A stopper (not shown) is provided in the body frame 12, and the pressing body 17 is restrained from rotating in the direction of arrow D as it comes into contact with the stopper.

When a power switch (not shown) is turned on in this state, power is supplied to the hoisting motor 19 and the control wire 19a is pulled in the direction of arrow A. Then, the pressing body 17 rotates in the direction of arrow B, and each pressing arm portion 17c of the pressing body 17 presses the sliding portion 15a, so that the decorative plate 15 moves in the direction of arrow C and the intake port of the decorative frame 13 1
3a is opened. At the same time, power is supplied to the fan motor 22a, and a ventilation operation is performed through the opened intake port 13a.

The hoisting motor 19 has a built-in clutch mechanism (not shown) mainly composed of a pair of frictionally joined clutch plates, and the decorative plate 15 is in an open state as the pair of clutch plates slip. Held in.

Here, each pressing arm portion 17 of the pressing body 17
When c is located on the arrow A direction side of the line of action B,
The pressing body 17 is biased in the direction of arrow D by each auxiliary spring 20. For this reason, the hoisting motor 19 moves the pressing body 17
The control wire 19a is pulled against the turning force in the direction of arrow D and the spring force of the return spring 16. Further, when each pressing arm portion 17c of the pressing body 17 is located on the arrow C direction side of the line of action B, the pressing body 17 is pressed by each auxiliary spring 2
The return spring 16 is urged in the direction of arrow B by 0, and the spring force of the return spring 16 is weakened. Therefore, the torque with which the hoisting motor 19 pulls the control wire 19a is also weakened.

When the power switch is turned off, the fan motor 22a is cut off and the fan 22b stops rotating. At the same time, the hoisting motor 19 is cut off and the return spring 16
The sliding portion 15a is pulled in the direction of arrow A by the spring force. As a result, the decorative plate 15 moves in the direction of arrow A and closes the intake port 13a of the decorative frame 13.

Here, each pressing arm portion 17 of the pressing body 17
When c is located on the arrow C direction side of the line of action B,
The pressing body 17 is biased in the direction of arrow B by each auxiliary spring 20. Therefore, the return spring 16 pulls the decorative plate 15 against the turning force of the pressing body 17. Further, when each pressing arm portion 17c of the pressing body 17 is located on the arrow A direction side of the line of action B, the pressing body 17 is biased in the arrow D direction by each auxiliary spring 20. Therefore, the decorative plate 15 is pulled only by the spring force of the return spring 16.

According to the above-described embodiment, the decorative plate 15 is biased in the direction of arrow C by each auxiliary spring 20 at the time of opening when the closing force acting on the decorative plate 15 is maximized. For this reason, the blocking force acting on the decorative plate 15 is weakened, so that it is possible to use the winding motor 19 having a low output. Moreover, unlike the case where the return spring 16 having a small spring force is used, the closing force acting on the decorative plate 15 is maintained at a predetermined level, so that the smooth movement of the decorative plate 15 in the arrow A direction may be impaired. There is no.

Further, as the decorative plate 15 moves in the direction of arrow C, the opening force acting on the decorative plate 15 is increased. For this reason, the closing force acting on the decorative plate 15 is made substantially constant to a predetermined level, so that the hoisting motor 1 having a lower output can be obtained.
9 can be used. Moreover, the decorative plate 15 is provided by the small and inexpensive toggle mechanism mainly including the auxiliary spring 20.
The occluding force acting on the is almost constant at a predetermined level. Therefore, it is advantageous in terms of space and cost.

Next, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. Transmission arm portion 17 of the pressing body 17
A lower end portion of an auxiliary spring 25 corresponding to an auxiliary member is hooked on a. This auxiliary spring 25 is composed of a tension coil spring, and its spring force is set to approximately twice that of the auxiliary spring 20. Further, in the body frame 12, both shaft portions 17b
Located on the upper side (the pressing arm portion 17c side) of the hook portion 25
a is provided, and the auxiliary spring 2 is attached to the hook portion 25a.
The upper end of 5 is hooked.

According to the above embodiment, as shown by the solid line,
Each pressing arm portion 17c of the pressing body 17 has an arrow A of the line of action
When it is located on the direction side, the auxiliary spring 25 is pressed by the pressing body 1.
7 is urged in the direction of arrow D. Further, as indicated by the chain double-dashed line, when each pressing arm portion 17c of the pressing body 17 moves toward the arrow C direction side of the line of action B, the auxiliary spring 25 causes the pressing body 1 to move.
7 is urged in the direction of arrow B. Therefore, the closing force that is substantially constant at a predetermined level acts on the decorative plate 15.

By the way, in the case of the first embodiment in which the catching portion 20a of the auxiliary spring 20 is arranged on the side of the transmitting arm portion 17a or the pressing arm portion 17c, which has a shorter dimension, the position of the catching portion 20a is changed. If they are deviated, the angle of the line of action (b) changes greatly, so that each auxiliary spring 20 is pressed by the pressing body 17
There is a risk that the turning force that acts on will deviate from the set value.

Therefore, the hook portion 20a is moved downward,
It is conceivable to increase the distance between the hook portion 20a and the shaft portion 17b. Then, even if the position of the hook portion 20a is displaced,
Since the angle of the action line B does not change significantly, each auxiliary spring 20
Therefore, it is possible to suppress the change in the turning force acting on the pressing body 17 to such an extent that there is no practical problem. However, since the length of each auxiliary spring 20 becomes large, the size of the device becomes large.

On the other hand, in this embodiment, the hooking portion 25a is arranged on the side of the pressing arm portion 17c, which has a long dimension, of the transmission arm portion 17a and the pressing arm portion 17c. Therefore, even if the position of the hook portion 25a is displaced, the angle of the line of action (b) does not change significantly, so that the change in the rotational force that acts on the pressing body 17 from the auxiliary spring 25 can be suppressed to such an extent that there is no practical problem. . Moreover, since the length of the auxiliary spring 25 does not increase, it is possible to prevent the device from becoming large.

Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7.
It will be described based on. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. First, in FIG. 6, two stoppers 20b are provided in the main body frame 12 (only one is shown). Each of these stoppers 20b corresponds to an engaging member, and each of the auxiliary springs 20 engages with the stopper 20b when the amount of rotation of the pressing body 17 exceeds a predetermined value, as shown by the chain double-dashed line.

By the way, the amount of rotation of the pressing body 17 in the direction of the arrow B may exceed a predetermined value due to manufacturing errors of the parts, mounting errors of the parts, etc., and the length of each auxiliary spring 20 may be close to the free state. Conceivable. In this case, the turning force acting on the pressing body 17 in the direction of the arrow B becomes small, and the closing force acting on the decorative plate 15 from the return spring 16 cannot be weakened, so that the closing force acting on the decorative plate 15 is predetermined. You will exceed the level.

On the other hand, in this embodiment, when the amount of rotation of the pressing body 17 in the direction of arrow B exceeds a predetermined value, each auxiliary spring 20 engages with the stopper 20b. Then, each auxiliary spring 20 expands and urges the pressing body 17 in the arrow B direction.
For this reason, the closing force acting on the decorative plate 15 from the return spring 16 can be weakened, so that the closing force acting on the decorative plate 15 is prevented from exceeding a predetermined level.
The rotational force acting on the pressing body 17 is indicated by "C" in FIG. 7 (a).

Further, in the above-mentioned first and third embodiments, each pressing arm portion 17c of the pressing body 17 and the hooking portion 20a.
Although the auxiliary spring 20 is hooked between and, the present invention is not limited to this. For example, the auxiliary spring 20 may be hooked between the one pressing arm portion 17c and the hook portion 20a.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. Each pressing arm portion 1 of the pressing body 17
A weight 26 corresponding to an auxiliary member is hung on 7c.

According to the above embodiment, as shown by the solid line,
When each pressing arm portion 17c of the pressing body 17 is located on the arrow A direction side of the line of action (a vertical line passing through the shaft portion 17b of the pressing body 17), each weight 26 attaches the pressing body 17 in the arrow D direction. I am energetic. Further, as shown by the chain double-dashed line, when each pressing arm portion 17c of the pressing body 17 moves to the arrow C direction side of the line of action B, each weight 26 urges the pressing body 17 in the arrow B direction.

For this reason, the closing force that is substantially constant at a predetermined level acts on the decorative plate 15, so that it is possible to use the hoisting motor 19 having a lower output. Moreover, the small and inexpensive toggle mechanism having the weight 26 as a main component makes the closing force acting on the decorative plate 15 substantially constant at a predetermined level. Therefore, it is advantageous in terms of space and cost.

In the fourth embodiment, the pressing body 1
Although the weight 26 was hung on each pressing arm portion 17c of 7,
The present invention is not limited to this, and may be hung on one of the pressing arms 17c, for example.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. In the body frame 12, a pressing body 17
Located above the pressing arms 17c of the
(Only one is shown in the drawing), and each of these hook portions 27 is provided.
An upper end of an auxiliary spring 27 corresponding to an auxiliary member is hooked on a. Each of these auxiliary springs 27 is composed of a leaf spring, and the lower end portion of each auxiliary spring 27 is hooked on the pressing arm portion 17c of the pressing body 17.

According to the above embodiment, as shown by the solid line,
When each pressing arm portion 17c of the pressing body 17 is located on the arrow A direction side of the line of action B (the straight line connecting the shaft portion 17b of the pressing body 17 and the hook portion 27a), each auxiliary spring 27 moves the pressing body 17 into contact. It is biased in the direction of arrow D. Further, as indicated by the chain double-dashed line, when each pressing arm portion 17c of the pressing body 17 moves toward the arrow C direction side of the line of action B, each auxiliary spring 27 urges the pressing body 17 in the arrow B direction.

For this reason, the closing force that is substantially constant at a predetermined level acts on the decorative plate 15, so that it is possible to use the winding motor 19 having a lower output. Moreover, the small and inexpensive toggle mechanism, which is mainly composed of the auxiliary spring 27, makes the closing force acting on the decorative plate 15 substantially constant at a predetermined level. Therefore, it is advantageous in terms of space and cost.

In the fifth embodiment, the pressing body 1
Although the auxiliary spring 27 is hooked on each pressing arm portion 17c of No. 7, it is not limited to this and may be hooked on one pressing arm portion 17c, for example.

Next, a sixth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. Two mounting portions 28a (only one is shown) are arranged in the main body frame 12, and each of these mounting portions 28a has an auxiliary spring 2 corresponding to an auxiliary member.
The upper end of 8 is attached.

Each of these auxiliary springs 28 is composed of a compression coil spring, and each shaft portion 17b of the pressing body 17 is arranged on the axis B of the auxiliary spring 28 (line of action B).
A pressing plate 28b is attached to the lower end of each auxiliary spring 28, and each pressing plate 28b presses the pressing arm portion 17c of the pressing body 17.

According to the above embodiment, as shown by the solid line,
Each pressing arm portion 17c of the pressing body 17 has an arrow A of the line of action
When it is located on the direction side, each auxiliary spring 28 urges the pressing body 17 in the arrow D direction. Further, as shown by the chain double-dashed line, when each pressing arm portion 17c of the pressing body 17 moves toward the arrow C direction side of the line of action B, each auxiliary spring 28 urges the pressing body 17 in the arrow B direction.

For this reason, the closing force that is substantially constant at a predetermined level acts on the decorative plate 15, so that it is possible to use the winding motor 19 having a lower output. In addition, the small and inexpensive toggle mechanism, which mainly includes the auxiliary spring 28, makes the closing force acting on the decorative plate 15 substantially constant at a predetermined level. Therefore, it is advantageous in terms of space and cost.

In the sixth embodiment, the shaft portion 17b is arranged on the axis B of each auxiliary spring 28, but the invention is not limited to this. For example, the shaft 17b may be arranged on the axis B of the auxiliary spring 28. You can move it away.

Next, a seventh embodiment of the present invention will be described with reference to FIG. The same members as those in the sixth embodiment will be designated by the same reference numerals and description thereof will be omitted, and only different members will be described below. An upper end of an auxiliary spring 29 corresponding to an auxiliary member is attached to each attachment portion 28a. Each of these auxiliary springs 29 is composed of a compression coil spring, and the direction of the arrow A is compressed, so that the relation of "axial height on arrow A <axial height on arrow C" is established.

According to the above-described embodiment, when each pressing arm portion 17c of the pressing body 17 rotates in the direction of arrow B, as shown by the chain double-dashed line, the amount of contraction of each auxiliary spring 29 increases, and each auxiliary spring 29c increases. The spring force acting on the pressing body 17 from 29 increases. Therefore, the turning force of the pressing body 17 in the direction of arrow B becomes large, and the force acting from the pressing body 17 on the decorative plate 15 in the direction of arrow C becomes large.

Therefore, the maximum value of the closing force acting on the decorative plate 15 becomes smaller, so that it is possible to use the winding motor 19 having a lower output. At the same time, the turning force acting on the pressing body 17 from each auxiliary spring 29
The closing force applied to the decorative plate 15 from the return spring 16 and the both auxiliary springs 29 can be made more constant because it is adjusted according to the rotational position of the.

In the sixth and seventh embodiments, each pressing arm portion 17c of the pressing body 17 is connected to the auxiliary spring 28.
However, the present invention is not limited to this, and one pressing arm portion 17c may be pressed, for example.

Further, in the above-mentioned first to seventh embodiments,
Although each pressing arm 17c of the pressing body 17 is brought into contact with the sliding portion 15a of the decorative plate 15, the present invention is not limited to this, and both may be connected, for example. In the case of this configuration, when the decorative plate 15 moves in the direction of arrow A, the biasing force in the direction of arrow D acting on the pressing body 17 from the auxiliary springs 20, 25, 27 to 29 and the weight 26 is transmitted to the sliding portion 15a. As a result, the decorative plate 15 moves more quickly in the direction of arrow A.

Further, in the above-mentioned first to seventh embodiments,
In holding the decorative plate 15 in the open state, the pair of clutch plates built in the winding motor 19 were slid between each other, but the invention is not limited to this. For example, the closing force of the decorative plate 15 causes the winding motor to rotate. 19 may be locked.

Further, in the above-mentioned first to seventh embodiments,
Although the control wire 19a is pulled by the hoisting motor 19, the present invention is not limited to this. For example, the control wire 19a may be pulled by a drive source such as a pneumatic cylinder, a hydraulic cylinder, or an electromagnetic solenoid.

Further, in the above-mentioned first to seventh embodiments,
Although the closing force acting on the decorative plate 15 is made substantially constant, the present invention is not limited to this. The point is that the intake port 12a is opened so that the maximum value of the closing force acting on the decorative plate 15 becomes small. The decorative plate 15 may be biased in the opening direction.

[0066]

As is apparent from the above description, the ventilation fan of the present invention has the following effects. According to the first , fourth, and fifth means, the lid body is biased in the opening direction when the lid body is opened to maximize the restoring force in the closing direction. For this reason, the closing force acting on the lid is weakened, so that a low-output drive source can be used. Moreover, since the closing force that acts on the lid is maintained at a predetermined level, there is no risk of impairing the smooth movement of the lid in the closing direction.

According to the first aspect of the present invention, the closing force acting on the lid is made substantially constant to a predetermined level by the small and inexpensive toggle mechanism mainly composed of the tension coil spring. Therefore, it is advantageous in terms of space and cost.

According to the second aspect of the invention, one end of the tension coil spring is arranged on the side of the longer length of the transmission arm and the pressing arm. Therefore, even if the mounting position of one end of the tension coil spring is deviated, the angle of the line of action does not change significantly. be able to. Moreover, since the length of the tension coil spring does not increase, it is possible to prevent the device from becoming large.

According to the third aspect of the invention, the tension coil spring is engaged with the engaging member when the amount of rotation of the pressing body in the positive direction exceeds the predetermined value. For this reason, the tension coil spring expands and urges the pressing body in the positive direction, so that the tension coil spring approaches a free state, and the closing force acting on the lid body from the tension coil spring exceeds a predetermined level. Is prevented.

According to the means described in claim 4 , the small and inexpensive toggle mechanism mainly composed of the leaf spring makes the closing force acting on the lid substantially constant at a predetermined level. Therefore, it is advantageous in terms of space and cost.

According to the means described in claim 5, the closing force acting on the lid is made substantially constant to a predetermined level by the small and inexpensive toggle mechanism mainly including the compression coil spring. Therefore, it is advantageous in terms of space and cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention (a side view showing a moving mechanism of a decorative plate).

FIG. 2 is a diagram showing changes in spring force.

FIG. 3 is a vertical sectional side view showing the overall configuration.

FIG. 4 is a front view showing a state in which a decorative plate and a decorative frame are removed.

FIG. 5 is a diagram showing a second embodiment of the present invention (a diagram schematically showing a toggle mechanism).

FIG. 6 is a view corresponding to FIG. 5 showing a third embodiment of the present invention.

FIG. 7 is a view corresponding to FIG.

FIG. 8 is a view corresponding to FIG. 5, showing a fourth embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 5 showing a fifth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 5 showing a sixth embodiment of the present invention.

FIG. 11 is a view corresponding to FIG. 5 showing a seventh embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 13 is a view equivalent to FIG.

[Explanation of symbols]

12a is an exhaust port, 13a is an intake port, 15 is a decorative plate (lid), 16 is a return spring (biasing member), 17 is a pressing body,
7a is a transmission arm portion, 17b is a shaft portion, 17c is a pressing arm portion, 19 is a hoisting motor (driving source), 20 is an auxiliary spring (auxiliary member, tension coil spring), 20b is a stopper (engaging member), and 24 is Ventilation fan body, 25 is an auxiliary spring (auxiliary member, tension coil spring), 26 is a weight (auxiliary member),
27 is an auxiliary spring (auxiliary member, leaf spring), 28 is an auxiliary spring (auxiliary member, compression coil spring), 28b is a pressing plate, 29
Indicates an auxiliary spring (auxiliary member, compression coil spring).

Claims (5)

(57) [Claims] 1. A ventilation fan main body having an intake port and an exhaust port, which sucks indoor air from the intake port and discharges it from the exhaust port, and an opening direction and a block which are provided in the ventilation fan main body and open the intake port. Which is movable in the closing direction, an urging member which occludes the intake port with the lid member by urging the lid member in the closing direction, and a urging member which attaches the lid member to the urging member. A drive source that moves in the opening direction against the force, an auxiliary member that urges the lid body in the opening direction when the intake port is opened, and a transmission arm portion and a pressing arm portion are provided on both sides of the shaft portion.
The driving force of the driving source is transmitted to the transmission arm section.
And a pressing body that rotates in the positive direction around the shaft.
The pressing arm portion of the pressing body is
When the lid is rotated to
The auxiliary member is biased at one end with respect to the shaft of the pressing body.
It is hooked on the fixed part to be secured, and the other end is hooked on the pressing body.
A ventilation fan consisting of a stretched coil spring . 2. An end portion of the tension coil spring is
Of the pressing arm portion and the transmission arm portion of the pressure body
The ventilation fan according to claim 1, wherein the ventilation fan is arranged on the side of the arm portion having a long dimension . 3. A positive rotation amount of the pressing body is a predetermined value.
The tension coil spring is engaged with the
A special feature is that an engaging member for extending the tension coil spring is provided.
The ventilation fan according to claim 1 or 2, which is a characteristic . 4. Indoor air having an intake port and an exhaust port
Ventilation fan body that sucks air from the intake port and discharges it from the exhaust port
And an opening provided on this ventilation fan body to open the intake port
And a lid that is movable in the closing direction and is closed, and with the lid being biased in the closing direction,
And a biasing member that closes the intake port, and the lid is moved in the opening direction against the biasing force of the biasing member.
And a driving source for moving the lid, and biases the lid in the opening direction when the intake port is opened.
The auxiliary member and the transmission arm and pressing arm are provided on both sides of the shaft.
The driving force of the driving source is transmitted to the transmission arm section.
And a pressing body that rotates in the positive direction around the shaft.
The pressing arm portion of the pressing body is
When the lid is rotated to
The auxiliary member is biased at one end with respect to the shaft of the pressing body.
It is hooked on the fixed part to be secured, and the other end is hooked on the pressing body.
A ventilation fan that consists of a leaf spring that is hung . 5. Indoor air having an intake port and an exhaust port
Ventilation fan body that sucks air from the intake port and discharges it from the exhaust port
And an opening provided on this ventilation fan body to open the intake port
And a lid that is movable in the closing direction and is closed, and with the lid being biased in the closing direction,
And a biasing member that closes the intake port, and the lid is moved in the opening direction against the biasing force of the biasing member.
And a driving source for moving the lid, and biases the lid in the opening direction when the intake port is opened.
The auxiliary member and the transmission arm and pressing arm are provided on both sides of the shaft.
The driving force of the driving source is transmitted to the transmission arm section.
And a pressing body that rotates in the positive direction around the shaft.
The pressing arm portion of the pressing body is
When the lid is rotated to
And the auxiliary member presses the pressing body through the pressing plate.
Characterized by a compression coil spring that presses the arm
And a ventilation fan.