JP3070321B2 - Switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for opening and closing a ventilation opening by means of a membrane member.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for a vehicle, a film as shown in FIGS. 18 and 19 has been used as a temperature adjusting means for adjusting an amount of air blown to a heater core or a mode switching means for switching a mode of an air outlet. Damper 1
00 may be adopted. This film damper 100
The case 10 has two winding shafts 102 and 103 and an intermediate shaft 104 connected by an interlocking wire 101.
5 are arranged in parallel with the ventilation ports 106 and 107 formed in
Winding port 1 while being wound by winding shaft 102 or 103
It translates along 06 and 107. Film damper 1
In the film damper 100, an opening (not shown) capable of opening the ventilation ports 106 and 107 is formed.
The position of the opening with respect to the ventilation ports 106 and 107 is displaced in accordance with the movement of, so that the ventilation ports 106 and 107 are opened and closed. In the case 105, an outer film grid shown in FIG. 18 and an inner film grid shown in FIG. 19 are formed depending on the positions of the winding shafts 102 and 103 with respect to the case 105.

[0003]

The above case 105
Is based on the assumption that the film damper 100 is supported without any slack between the winding shafts 102 and 103 (with tension), and the inner wall surface of the case 105 facing the film damper 100 is It is formed so as to form a linear shape parallel to the damper 100 (parallel to each tangent line between the winding shafts 102 and 103 and the intermediate shaft 104). However, the actual film damper 100 is supported in a state where a certain amount of slack is provided between the winding shafts 102 and 103 (in a state in which the film damper 100 is slightly outwardly swelled from the state in which tension is applied) in order to reduce the operation force. Have been. Therefore, the film damper 100
When the film damper 100 is operated, friction between the film damper 100 and the case 105 is generated when the film damper 100 operates. When the blower is stopped, for example, at the time of warm-up in an automatic air conditioner or at the time of manual push, the frictional noise is unpleasant and gives an occupant a discomfort.

The inventors of the present invention have paid attention to the contact surface pressure and the contact area between the film damper 100 and the case 105 relating to the amount of change in the friction noise, and have investigated the relationship between the contact surface pressure and the contact area and the noise. As shown in FIG. 20 and FIG. 21, a result was obtained in which the smaller the contact surface pressure or contact area, the lower the friction noise. Note that FIG.
FIG. 21 shows the relationship between the minute surface pressure and the noise using the contact area between the film damper 100 and the case 105 as a parameter.
The relationship between the minute area and the noise is shown by using the contact surface pressure at 05 as a parameter. The present invention has been made based on the above circumstances, and an object of the present invention is to produce a frictional sound generated by rubbing between the film-shaped member and the opening frame when the film-shaped member is driven when the air supply is stopped or when the air flow is small. Is to reduce.

[0005]

According to the present invention, in order to achieve the above object, according to the present invention, there is provided an opening frame having a ventilation port through which blast air can pass, and the ventilation port on the windward side of the ventilation port. A film-shaped member provided in parallel with an opening capable of opening the ventilation port, and sliding the film-shaped member with respect to the ventilation port to position the opening with respect to the ventilation port. In the opening / closing device that opens and closes the ventilation opening by displacing, the opening frame receives the wind pressure to form the membrane.
When the member bends, the receiving member is pressed against the surface of the film-like member.
Has a surface, the film-like member is blown during blow receiving wind pressure of the air only in contact with the receiving surface, the blowing stops <br/> time to extinction of wind pressure away from the receiving surface, the receiving surface It is a technical means that the support is performed while maintaining a predetermined gap between them.

According to a second aspect of the present invention, there is provided an opening frame having a ventilation port through which the ventilation air can pass, and an opening portion disposed parallel to the ventilation port on the windward side of the ventilation port and capable of opening the ventilation port. An opening / closing device that opens and closes the ventilation port by sliding the membrane member with respect to the ventilation port and displacing the position of the opening with respect to the ventilation port. Are formed in such a manner that the film-shaped member comes into contact with the film-shaped member at both ends facing the film-shaped member in the moving direction, and the gap between the film-shaped member and the center gradually increases from the both ends to the center. That is the technical means.

According to a third aspect of the present invention, there is provided the switchgear according to the first aspect.
In the opening frame, the wall surface facing the film-shaped member,
It is a technical means that it is provided in a shape along the film-like member. According to a fourth aspect of the present invention, in the opening / closing device according to the third aspect, the film-shaped member is supported with a fixed gap between the film-shaped member and the opening frame. Claim 5
Then, the opening and closing device according to claim 3, wherein the opening frame
Is that the wall surface facing the film-like member is bent by wind pressure
Technology that is provided in a shape along the membrane member at the time
Means. In claim 6, any one of claims 1 to 5
The switchgear according to any one of the preceding claims, wherein the film member
While supporting the membrane member to change the ride direction
An intermediate axis, and the film-shaped member has an angle of 60 degrees or less with respect to the intermediate axis.
The technical means is that it is supported at the above bending angle.
You.

[0008]

According to the first aspect of the present invention, the film-like member comes into contact with the receiving surface of the opening frame when air pressure is applied to the film-shaped member, but when the air-pressure is stopped when the wind pressure disappears. There never in contact with the receiving surface of the opening frame, and is supported with a predetermined gap between the receiving surface. Therefore, when the film-shaped member is driven at the time of stopping the air blowing, the film-shaped member is
There is no rubbing against the receiving surface of the opening frame, and no friction noise is generated. In the opening / closing device according to the second aspect of the present invention, the opening frame facing the film member contacts the film member only at both ends in the moving direction of the film member, and the contact area with the film member is reduced. It is formed as follows. Therefore, when the film-shaped member is driven at the time of the stoppage of the airflow without receiving the wind pressure, the contact area between the film-shaped member and the opening frame is small, so that the friction noise generated by the rubbing of both members is greatly reduced. Claim 3
In the opening and closing device according to the present invention, the wall surface of the opening frame facing the film-shaped member is provided in a shape along the film-shaped member. Therefore, there is no part that strongly contacts the film-like member and the opening frame, and the pressing force of the film-like member against the opening frame is dispersed, so that the contact surface pressure is reduced. As a result, the friction noise generated due to the operation of the film member is reduced. Claim 4
The opening and closing device according to the present invention is further characterized in that the membrane member is supported with a fixed gap between the opening frame and the contact surface pressure between the opening frame and the membrane member. Friction noise can be reduced. An opening / closing device according to the present invention according to claim 5.
The wall of the opening frame facing the membrane member receives wind pressure
It is provided in a shape along the membrane member when bent. This
In the case of, the membrane member is opened when the membrane member is driven during air blowing.
The surface pressure between the mouth frame and the receiving surface can be reduced. Claim
Item 6. The opening / closing device of the present invention according to Item 6, wherein the intermediate shaft is a film-like member.
Is supported at a bending angle of 60 degrees or more,
Can be suppressed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the switchgear of the present invention applied to a vehicle air conditioner will be described with reference to FIGS. FIG. 1 is a sectional view of an opening / closing device applied to a vehicle air conditioner, and FIG. 4 is a sectional view of the vehicle air conditioner. The vehicle air conditioner 1 of the present embodiment includes a unit case 2 that guides blast air into a vehicle interior, a blower 3 that generates an air flow in the unit case 2, and a refrigerant of a refrigeration cycle disposed in the unit case 2. It comprises an evaporator 4 and a heater core 5 using the engine cooling water as a heat source. Inside the unit case 2, there are formed a hot air vent 6 for guiding the blast air that has passed through the refrigerant evaporator 4 to the heater core 5, and a cool air vent 7 that bypasses the heater core 5. The opening ratio of the hot air vent 6 and the cool air vent 7 (both of which constitute the vent of the present invention) is adjusted by a temperature adjusting means described below. At the downstream end of the unit case 2, there is a DEF for blowing the temperature-controlled blast air into the vehicle interior.
An outlet 8, a VENT outlet 9, and a FOOT outlet 10 are provided. Each of the outlets 8 to 10 (both constituting a ventilation opening of the present invention) is selectively opened by an outlet switching means described below.

The temperature adjusting means (opening / closing device of the present invention) comprises two winding shafts 11, 12 rotatably supported on the side wall of the unit case 2, and both ends fixed to the winding shafts 11, 12, respectively. A flexible film damper 13 (a film-like member of the present invention), and a servomotor 14 for driving the winding shaft 11 to rotate. The film damper 13 has an opening (not shown) through which air is blown. When the winding shaft 11 is rotationally driven by the servomotor 14, the film damper 13 slides between the winding shafts 11 and 12 to open. By displacing the position of the portion, the opening ratio of each of the ventilation ports 6 and 7 is adjusted. The outlet switching means (opening / closing device of the present invention) includes two winding shafts 1 rotatably supported on the side wall of the unit case 2.
5, 16; a flexible film damper 17 (film-like member of the present invention) having both ends fixed to the winding shafts 15, 16; a servomotor 18 for rotating and driving the winding shaft 15; And two intermediate shafts 19 and 20 for supporting the two. The film damper 17 has an opening (not shown) for letting the air blow through, and when the winding shaft 15 is rotationally driven by the servomotor 18,
By sliding between the winding shafts 15 and 16 via the intermediate shafts 19 and 20, the position of the opening is displaced, and the above-described outlets 8 to 10 are selectively opened.

Here, the relationship between the hot air vent 6 and the cold air vent 7 and the film damper 13 and each air outlet 8
Hereinafter, the relationship between the VENT outlet 9 and the film damper 17 will be described. In the opening frame 2a (part of the unit case 2) around the VENT outlet 9,
A lattice portion 2b as shown in FIG. 2 is provided to prevent the film damper 17 from bending due to the wind pressure at the time of blowing. The inner wall surface ( the receiving surface of the present invention: the side facing the film damper 17) of the opening frame 2a has a gap with the film damper 17 from both ends to the center in the sliding direction of the film damper 17 (left-right direction in FIG. 1). Is gradually increased (in this embodiment, the radius of curvature R800).

In order to reduce the friction noise generated by rubbing with the opening frame 2a, the film damper 17 is provided with the air blowing stopped (without receiving the wind pressure) .
It is supported so as to maintain a predetermined clearance C between itself and the inner wall surface . As shown in FIG. 5 (the relationship between the clearance and the noise), the friction noise generated by the rubbing between the film damper 17 and the opening frame 2a decreases as the clearance C increases, but if the clearance C is too large,
In this embodiment, a clearance C of about 1.5 mm is provided at both ends of the opening frame 2a because the sealing property between the film damper 17 and the opening frame 2a is reduced. The relationship between the clearance and the noise shown in FIG. 5 was measured using two types of film dampers (A film and B film) having different film thickness, flexibility, surface roughness (material) and the like. . The outer R lattice shown in the figure is a case where the inner wall surface of the opening frame facing each film is a curved surface, and the straight lattice is
This is a case where the inner wall surface of the opening frame facing each film is a flat surface.

Next, the operation of this embodiment will be described. Now, in a state where the blower 3 is operating, the flexible film damper 17 receives the wind pressure of the blowing air and presses against the inner wall surface of the opening frame 2a (including the grid portion 2b) as shown in FIG. Therefore, air leakage between the opening frame 2a and the film damper 17 is prevented. When the film damper 17 is driven during the blowing, the friction sound generated by the rubbing between the film damper 17 and the opening frame 2a is eliminated by the operation sound and the blowing sound of the blower 3, so that the frictional sound is reduced.
Sound does not matter. Next, when the blower 3 is stopped, the wind pressure applied to the film damper 17 disappears, so that the film damper 17 has a minimum clearance C of 2 mm between the film damper 17 and the inner wall surface of the opening frame 2a as shown in FIG. State.

When the air blow is stopped, the film damper 1
7 is driven (for example, at the time of warm-up by an auto air conditioner or at the time of manual push), the film damper 17 is connected to the two through the intermediate shafts 19 and 20 while maintaining the clearance C between the film damper 17 and the opening frame 2a. It slides between the winding shafts 15 and 16. Therefore, even when sliding, the contact between the film damper 17 and the opening frame 2a can be reduced, and as shown in FIG. 6, compared with a conventional product having no clearance (indicated by a dashed line), both are rubbed. This can reduce the friction noise generated by this. Investigation of the relationship between the magnitude of the friction noise generated by the rubbing of the film damper 17 and the opening frame 2a and the driving speed of the film damper 17 shows that as the driving speed of the film damper 17 increases, as shown in FIG. Was obtained. The measurement results shown in FIG. 7 are obtained by measuring three types of film dampers (A film, B film, and C film) having different thicknesses, flexibility, and surface roughness (material). Therefore, by reducing the driving speed of the film damper 17 within a practical range,
It is possible to further reduce the friction noise. In this embodiment, the noise (friction sound) when the air supply is stopped has been described in relation to the film damper 17 and the VENT outlet 9, but the film damper 17, the DEF outlet 8, and the FOO
The same applies to the relationship between the T outlet 10, the film damper 13, the hot air vent 6 and the cold air vent 7.

Next, a second embodiment of the present invention will be described. FIG. 8 is a sectional view of the switchgear according to the second embodiment. As in the first embodiment, the opening / closing device of the present embodiment is configured such that the inner wall surface of the opening frame 2a facing the film damper 17 extends from both ends to the center in the sliding direction of the film damper 17 in the sliding direction. 17 (R800 in this embodiment, that is, a radius of curvature of 800).
mm). On the other hand, the film damper 17
Are supported in contact with the opening frame 2a only at both ends of the opening frame 2a when the air supply is stopped. In this embodiment, the contact area between the film damper 17 and the opening frame 2a is smaller than that of a conventional opening / closing device in which the inner wall surface of the opening frame 2a facing the film damper 17 is flat.
Friction noise between the two can be greatly reduced. In addition, since no clearance is provided at both ends of the opening frame 2a, the sealing performance at the time of blowing can be improved.

Next, a third embodiment of the present invention will be described. FIG. 9 is a sectional view of the switchgear according to the third embodiment. The opening and closing device according to the present embodiment includes the opening frame 2 facing the film damper 17.
The inner wall surface of a is not a curved surface as in the first and second embodiments, but is a straight line (plane). Further, a certain clearance C is provided between the film damper 17 and the inner wall surface of the opening frame 2a in order to reduce a friction noise generated when the film damper 17 is driven when the air supply is stopped.

In each of the above embodiments, the switching device of the present invention is applied to both the temperature control means and the air outlet switching means, but may be applied to only one of them. Or
It is also possible to apply as an inside / outside air switching means for switching between an inside air introduction port for introducing air into the unit case 2 and an outside air introduction port.

Next, a fourth embodiment of the present invention will be described. 10 and 11 are cross-sectional views of an opening / closing device according to a fourth embodiment. FIG. 10 shows an externally wound film lattice, and FIG. 11 shows an internally wound film lattice. The opening / closing device 21 of the present embodiment selectively opens and closes the case lattice portion 24 having the first ventilation port 22 and the second ventilation port 23 through which the blown air passes, and the first ventilation port 22 and the second ventilation port 23. The film damper 25 includes winding shafts 26 and 27 and an intermediate shaft 28 that support the film damper 25. The case lattice portion 24 is provided such that the opening surface of the first ventilation port 22 and the opening surface of the second ventilation port 23 form a predetermined angle. The film damper 25 is
Both ends are fixed to the winding shafts 26 and 27, and are arranged on the windward side of the first ventilation port 22 and the second ventilation port 23.
The winding shafts 26 and 27 are connected by a wire 29. When one of the winding shafts 26 (or 27) is rotationally driven by driving means (not shown) such as a servomotor, the other winding shaft 27 (or 27) is rotated. Or 26) is provided so as to interlock (rotate) via a wire 29. The intermediate shaft 28 is
The film damper 25 is supported at an intermediate portion between the first ventilation port 22 and the second ventilation port 23 so that the film damper 25 is parallel to the ventilation port 22 and the second ventilation port 23.

In the opening / closing device 21, a film damper 25 is provided between the winding shafts 26 and 27 via an intermediate shaft 28.
Is supported so as to have a certain slack (3% or less of the entire length of the film damper 25) between the winding shaft 26 and the winding shaft 27 in order to reduce the operation force. Therefore, the film damper 25 is in a state where tension is applied to the film damper 25 between the winding shaft 26 and the intermediate shaft 28 and between the winding shaft 27 and the intermediate shaft 28 (shown by a dashed line in FIGS. 10 and 11). Compared to the state shown in FIG. 10 and FIG. 1, a slack is left around the winding shaft 27 and slightly expanded (toward the case lattice portion 24).
1 indicated by a solid line). FIGS. 10 and 11 show a film shape in a windless state. The case lattice portion 24 has an inner wall surface facing the film damper 25 such that the inner wall surface follows the trajectory of the film damper 25 when the film damper 25 is operated during blowing (in a state where wind pressure is applied to the film damper 25). It is formed in a curved shape (see FIGS. 12 and 13; both figures show a state in which wind pressure is applied to the film damper 25). The inner wall surface of the case lattice portion 24 may have a curved shape that follows the trajectory of the film damper 25 when the film damper 25 is operated in a windless state. Since the bulge of the film damper 25 is large, it is possible to reduce the surface pressure between the film damper 25 and the case lattice portion 24 by forming the curved shape along the locus of the film damper 25 at the time of blowing.

As described above, in this embodiment, since the inner wall surface of the case lattice portion 24 has a curved shape along the locus of the film damper 25, the surface pressure between the film damper 25 and the case lattice portion 24 is dispersed. Thus, the friction noise caused by the rubbing of both can be reduced. Further, since the inner wall surface of the case lattice portion 24 has a curved shape along the film damper 25 at the time of air blowing, the case lattice portion 2 is in a non-wind state.
4, a slight clearance δ is formed between the inner wall surface of the film 4 and the film damper 25. Therefore, when the film damper 25 is operated in a windless state, the surface pressure between the case lattice portion 24 and the film damper 25 becomes small (or no), and the friction noise is further reduced. In addition, the air leakage at the time of air blowing caused by the formation of the clearance δ between the case lattice portion 24 and the film damper 25 is formed around the winding shafts 26 and 27 by applying the wind pressure to the film damper 25. The slack disappears, and the film damper 25 is pressed against the case lattice portion 24 to ensure the sealing property, thereby preventing the film damper 25 from being loosened.

When the clearance δ between the case lattice portion 24 and the film damper 25 increases, the sealing performance between the two decreases, so that the clearance δ between the two increases.
Needs to be set based on the balance between the friction noise and the amount of wind leakage, as shown in FIG. According to the measurement results shown in FIG. 14, the case of the present embodiment in which the inner wall surface of the case lattice portion 24 has a curved shape is the case of the conventional example in which the inner wall surface of the case lattice portion 24 has a linear shape (indicated by a black dot in the drawing). This shows that the noise is lower and the noise is reduced as the clearance δ increases. In addition, the amount of wind leakage increases as the clearance δ increases. As can be seen from FIG. 14, the inner wall surface of the case lattice portion 24 has a curved shape along the locus of the film damper 25, and an appropriate clearance δ is set between the case lattice portion 24 and the film damper 25. so,
Friction noise can be effectively reduced.

Also, as in this embodiment, the film damper 25
Is supported by the intermediate shaft 28 between the winding shafts 26 and 27, the shape of the film damper 25 greatly changes depending on the bending angle θ of the film damper 25 at the intermediate shaft 28. For example, in the case of using the film outer winding grid as shown in FIG. 15, the smaller the bending angle θ of the film damper 25, the larger the floating amount of the film damper 25 becomes. When a lattice is used, the radius of curvature of the S-shaped curve drawn by the film damper 25 between the winding shafts 26 and 27 and the intermediate shaft 28 decreases as the bending angle θ of the film damper 25 decreases.
Accordingly, since the shape of the inner wall surface of the case lattice portion 24 also changes complicatedly with the change of the shape of the film damper 25, the bending angle θ of the film damper 25 at the intermediate shaft 28
It is expected that the magnitude of the fricative noise between the film damper 25 and the case lattice portion 24 will also change in accordance with.

Therefore, the inventor of the present application proposed that the film damper 2
As a result of measuring the relationship between the bending angle θ and the noise in FIG.
As shown in FIG. 7, it was found that the noise increased as the bending angle θ of the film damper 25 became smaller. (Note that the measurement results of the present embodiment are indicated by triangles in the figure. The measurement results indicated by triangles in the figure are those of the conventional example in which the inner wall surface of the case lattice portion has a linear shape.) In the case of this embodiment, in order to reduce noise, it is desirable to use the film damper 25 so that the bending angle θ of the film damper 25 is large (for example, θ> 60 degrees). In the present embodiment, the inner wall surface of the case lattice portion 24 facing the film damper 25 has a curved shape such that it follows the locus of the film damper 25 when the film damper 25 is operated at the time of blowing air. Damper 25
May be formed in a curved shape along the film damper 25 in a state where is stationary.

[0024]

The opening and closing device of the present invention reduces the contact surface pressure or contact area between the film-like member and the opening frame when the film-like member is driven when the air supply is stopped or when the air flow is small. Friction noise generated between the film-like member and the opening frame can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a switchgear according to a first embodiment.

FIG. 2 is a perspective view of the opening / closing device.

FIG. 3 is a cross-sectional view of the opening / closing device showing a state at the time of blowing.

FIG. 4 is a cross-sectional view of the vehicle air conditioner.

FIG. 5 is a graph showing a relationship between clearance and noise (frictional sound).

FIG. 6 is a graph showing a noise reduction effect of the present embodiment.

FIG. 7 is a graph showing a relationship between a driving speed of a film damper and noise.

FIG. 8 is a sectional view of a switchgear according to a second embodiment.

FIG. 9 is a sectional view of a switchgear according to a third embodiment.

FIG. 10 is a sectional view of a switchgear according to a fourth embodiment.

FIG. 11 is a sectional view of a switchgear according to a fourth embodiment.

FIG. 12 is a cross-sectional view showing a state in which wind pressure is applied to a film damper in the opening and closing device shown in FIG.

13 is a cross-sectional view showing a state in which wind pressure is applied to a film damper in the opening and closing device shown in FIG.

FIG. 14 is a graph showing the relationship between the clearance and noise and wind leakage.

15 is a cross-sectional view showing a bending shape of a film damper at an intermediate shaft in the opening and closing device shown in FIG.

16 is a cross-sectional view showing a bending shape of a film damper at an intermediate shaft in the opening and closing device shown in FIG.

FIG. 17 is a graph showing a relationship between a bending angle of a film damper and noise.

FIG. 18 is a cross-sectional view of a switchgear according to the related art.

FIG. 19 is a sectional view of a switchgear according to the related art.

FIG. 20 is a graph showing the relationship between minute surface pressure and noise.

FIG. 21 is a graph showing a relationship between a very small area and noise.

[Explanation of symbols]

 (1st Example-3rd Example) 2a Opening frame 6 Hot air vent (vent) 7 Cold air vent (vent) 8 DEF vent (vent) 9 VENT vent (vent) 10 FOOT outlet (vent) 13 Film damper (membrane member) 17 Film damper (membrane member) (Fourth embodiment) 21 Opening / closing device 22 First vent (vent) 23 Second vent (vent) 24 Case lattice part (opening frame) 25 Film damper (membrane member)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-U 2-77537 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 13/10

Claims (6)

(57) [Claims] 1. A film having an opening frame having a ventilation opening through which air can pass, and an opening arranged on the windward side of the ventilation opening in parallel with the ventilation opening and having an opening through which the ventilation opening can be opened. and a member, the film member is slid relative to the vent, the opening and closing device for opening and closing the ventilation openings by displacing the position of the opening relative to the vent, the opening frame, the wind pressure When the film-like member is bent due to
To have a receiving surface which is pressed by the surface of the film member, the film member, the front only when the blower for receiving the air pressure of the blown air
Contacting the serial receiving surface, wherein at the time of air blowing is stopped to disappear the wind pressure
An opening and closing device characterized by being supported away from a receiving surface with a predetermined gap between the opening and the receiving surface . 2. An open frame having an air vent through which air can pass, and a film formed on the windward side of the air vent and in parallel with the air vent and having an opening capable of opening the air vent. A member that slides the film-shaped member with respect to the ventilation opening, and opens and closes the ventilation opening by displacing the position of the opening with respect to the ventilation opening. In the moving direction of the film-like member, the film-like member is in contact with the film-like member at both ends facing the film-like member, and is formed such that the gap with the film-like member gradually increases from the both ends to the center. Switchgear characterized by. 3. The opening and closing device according to claim 1 , wherein the opening frame has a wall surface facing the film-like member provided in a shape along the film-like member. 4. The switchgear according to claim 3, wherein said film-like member is supported with a certain gap between said film-like member and said opening frame. (5) The opening frame is a wall surface facing the film-shaped member.
But the membrane when bent under wind pressure Shape along the shape member
4. The opening / closing device according to claim 3, wherein
Place. 6. To change the sliding direction of the membrane member
An intermediate shaft that supports the film-like member for The bending angle of the film-like member with respect to the intermediate axis is 60 degrees or more.
6. The support according to claim 1, wherein
The switchgear according to any one of the above.