JPH0996142A - Electromagnetic shield door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a hindrance in walking upon opening of a door and to ensure an electromagnetic shieldability upon closing of the door by eliminating a height difference on the floor side. SOLUTION: An electromagnetic shield door A is formed in its lower end bottom part 10 with a storage recess 41 laid along a door frontage direction and opened toward the surface of a floor 20. A floor part confronting the storage recess 41 at a door closing position, is formed therein with an opened floor storage recess 50. A conductive rotary member 30 having a flat surface 30a is provided in the floor storage recess 50. A rotary shaft 31 is provided in the floor storage recess 50 so that the flat surface 30a is turned into and stored in the recess 50 so as to be flush with the surface of the floor 20 upon door opening, and is turned so as to be made into contact with the inner surface 42 of the storage recess 41 in a conductive condition. Further, a small protrusion 60 adapted to abut against a cut-out 70 in the lower part of the door surface of the electromagnetic shield door A is provided at a position on the flat surface 30a, corresponding to an end part remote from a rotary support 14 of the door A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield door provided at an entrance / exit of an electromagnetic shield room, and in particular, has a structure in which a step is not provided on the floor surface side of the entrance / exit, and the conductivity between the electromagnetic shield door and the floor surface side. It is the one that can be easily secured.

[0002]

2. Description of the Related Art In a conventional electromagnetic shield door, in order to secure the electromagnetic shield performance when the door is closed, a skeleton is made rigid and a metal plate is attached to the surface. Further, in order to improve the conductivity of the door and the door frame, a strong door opening / closing device such as a Gremon device used in a safe or the like is used. Further, in order to secure further conductivity, the contact portion between the door and the door frame may be a fitting type.

[0003]

Although the above-mentioned electromagnetic shield door has high performance, it has a large weight due to the use of a special device, which causes a problem of poor workability and high construction cost. Further, in the case where the contact portion between the door and the door frame is of a fitting type, a step is generated in a portion corresponding to the sill on the floor surface, which causes obstacles for walking when the door is opened and passage of a transportation vehicle such as a dolly. On the other hand, in the configuration in which the door frame on the floor surface side is not provided, there is a concern that a gap is likely to occur between the floor surface side and the door side, and the electromagnetic shielding effect of such a portion cannot be sufficiently obtained. Therefore, the present invention is proposed in view of the above problems, and an object of the present invention is to provide an electromagnetic shield door that eliminates a step on the floor surface to eliminate a traffic obstacle at the time of opening the door and can also secure the electromagnetic shielding property when the door is closed. And

[0004]

In order to solve the above-mentioned problems, the invention as set forth in claim 1 is an electromagnetic shield door provided in a door frame of an entrance / exit of an electromagnetic shield room, wherein a lower end bottom portion of the electromagnetic shield door is provided. A storage recess opened toward the floor is provided along the door front direction, and at the same time, a floor storage recess opened in the floor facing the opening of the storage recess of the electromagnetic shield door at the position when the door is closed. When the door is opened, the rotation center is provided in the floor storage recess so that the flat surface is rotated and stored in the floor storage recess so that the flat surface is flush with the floor surface. When the door is closed, the flat surface is stored in the floor storage recess. A conductive rotating body having the flat surface, which is rotated from the inside into the storage recess and is brought into contact with the inner surface of the storage recess in a conductive state, is provided in the floor storage recess, and in front of the conductive rotation body. At positions corresponding to the opposite end the rotation support side of the electromagnetic shield door on a flat surface, took measures to provide a small projection which abuts against the notch of Tobiramen lower when closing the electromagnetic shield door.

In the above means, the conductive rotating body is provided with its center of rotation in the floor storage recess so that the flat surface of the conductive rotating body is flush with the floor surface in the floor storage recess when the door is opened. Since it is configured to rotate and store, when the electromagnetic shield door is opened, there is no step on the floor surface of the entrance and exit, and the door becomes almost flat, so that there is no obstacle to vehicle traffic. Also, when the electromagnetic shield door is closed, the conductive rotating body whose flat surface has been stored flush with the floor until then is rotated, and the flat surface is stored in the recess at the bottom end of the electromagnetic shield door. The inner surface is contacted in a conductive state. Therefore, when the door is closed, the conductive state on the floor side of the electromagnetic shield door is secured,
Electromagnetic shield can be performed.

Further, in the above construction, the end of the electromagnetic shield door on the side opposite to the rotation center side on the flat surface which is made flush with the floor surface when the electrically conductive rotary member is housed in the floor housing concave portion is accommodated. A small protrusion that abuts a notch in the lower part of the door surface when the electromagnetic shield door is closed is provided at the position. Therefore, immediately before the electromagnetic shield door is completely closed, the small protrusion hits the notch in the lower part of the door surface and is knocked down, whereby the conductive rotating body can be rotated by itself from the floor storage recess to the storage recess. . In addition, since the lower part of the door surface where the small protrusion abuts is formed in the notch, the flat surface of the conductive rotating body is the bottom end of the electromagnetic shield door when the small protrusion is tilted just before closing the electromagnetic shield door. The small protrusion can be pushed down smoothly without hitting the.

On the other hand, at the time of opening the door, if the electromagnetic shield door is opened, the flat surface that was in contact with the inner surface of the storage recess is pushed down toward the floor by the inner surface of the storage recess, and the conductive rotating body naturally enters the floor storage recess. It is stored by rotating. Further, since the protrusion is formed as a small protrusion and is provided at the end of the doorway provided with the electromagnetic shield door, it does not interfere with the passage of the doorway when the door is opened. Further, the invention according to claim 2 is such that the cutout portion at the lower portion of the door surface of the invention according to claim 1 is cut out from the lower end bottom portion of the electromagnetic shield door in a substantially inverted L shape, and the lower end bottom portion of the cutout portion is formed. , So that it is located above the floor. If the notch is cut out in an inverted L-shape from the lower end as described above, and the bottom end of the notch is located above the floor surface,
As described above, the timing for inclining the small protrusion is set just before the electromagnetic shield door is closed, and the flat surface of the conductive rotating body is not caught on the bottom end of the electromagnetic shield door when the door is closed. The door closing operation can be linked well.

Further, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the inner bottom surface of the floor storage recess is formed to be a flat surface, and the conductive rotary member is made of a substantially metal plate. And one plate surface is a flat surface provided with small protrusions, and the other plate surface is a flat surface capable of making surface contact with the bottom surface of the floor storage recess. As described above, by making the conductive rotating body made of metal, good conductivity of the rotating body is ensured, and the conductive rotating body itself is made heavy to be stored in the storage recess and the floor storage recess. Has a good stability during storage. In particular, by making one plate surface formed into a substantially plate shape a flat surface capable of making surface contact with the flat bottom surface inside the floor storage recess, the floor surface of the conductive rotating body stored in the floor storage recess is Even if you drive on a flat surface, you do not have to worry that the end will be lifted by rotation.

Further, the invention according to claim 4 is the invention according to claim 1, 2 or 3 above, in which when the electromagnetic shield door is closed, the peripheral edge portion of the door surface is brought into conductive contact with the door frame surface. In addition, the small protrusions are provided on the flat surface of the conductive rotary member on the front surface side of the door frame surface. If the small protrusions are located on the front side of the door frame surface, the small protrusions will not obstruct the passage of the door.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The electromagnetic shield door A of the present invention is shown in FIG.
As shown in (a), one of the substantially rectangular doors is rotatably supported by a hinge, a pivot, or the like, and the lower end bottom portion 10 faces the floor 20 surface. Further, when the door is closed, in the present embodiment, the electromagnetic shield door A can be closed by bringing the side 11 side and the top end side 12 of the door surface into conductive contact with the frame surface 13a of the door frame 13. Is formed in. In the present embodiment, the inner peripheral edge portion of the electromagnetic shield door A is left for surface contact with the door frame surface 13a, and the inner side is formed as a convex portion that can be fitted into the door frame 13. This convex portion is fitted into the door frame 13 so that the above-mentioned conduction state can be stably obtained when the door is closed. Further, in the present embodiment, as the electromagnetic shield door A, a metal honeycomb structure material, a wooden material, or the like is used as the core material, and a metal foil is attached to the surface of the door to reduce the weight. In particular, a metal plate is used at the peripheral edge portion of the door surface that comes into contact with the door frame surface 13a so that conductivity with the door frame surface 13a can be ensured.

Further, in this embodiment, a storage chamber 40 in which the conductive rotating body 30 can be stored is provided so as to project toward the front side on the lower end side of the front side of the electromagnetic shield door A. As shown in FIG. 1B, the inside of the storage chamber 40 is formed into a storage recess 41 having a short quadrant shape in cross section. Storage recess 41
Is opened in a rectangular shape having a length about the width of the frontage of the electromagnetic shield door A from the bottom bottom portion 10 of the electromagnetic shield door A so as to face the floor 20 surface. In addition, inside the storage recess 41, the front front side is a substantially vertical plane so that the front side of the electromagnetic shield door A is a peripheral surface 41a corresponding to the arc side of the short quadrant in cross section. Inner surface 42 of the storage recess of
It is formed to become. Further, in the present embodiment, the peripheral surface 41a is formed with a curvature that allows the end of the conductive rotary body 30 that enters the storage recess 41 to rotate lightly in the rotating direction when the door is closed.

On the other hand, at the position when the electromagnetic shield door A is closed, the floor storage concave portion 5 opened in conformity with the opening shape of the storage concave portion 41 at the floor 20 portion facing the lower end bottom portion 10 mentioned above.
0 is provided. The floor storage recess 50 is a substantially box-shaped recess and has a flat bottom surface. Further, the conductive rotating body 30 used in the present embodiment is formed in a substantially rectangular metal plate shape having a length that can be accommodated in the floor storage recess 50 and a little thick. In the present embodiment, the plate thickness of the substantially plate-shaped conductive rotating body 30 is such that the flat surface 30a is flush with the floor 20 surface when the conductive rotating body 30 is housed in the floor housing recess 50. At the same time, the other flat plate surface 30b is set so as to be able to be stored in surface contact with the bottom surface of the floor storage recess. further,
The side surface portion in the longitudinal direction of the thick metal plate-shaped conductive rotating body 30 is formed with rounded corners on the side where the rotating shaft 31 described later is provided. Further, the corner portion to be stored in the bottom of the floor storage recess 50 is also formed into a rounded corner, and the box storage recess 50 having a box shape is formed.
Conductive rotating body 30 so that it is easy to take out while rotating from inside
Is formed into a substantially oval shape.

On the other hand, the rotating shaft 31 of the conductive rotating body 30 is
As shown in FIGS. 1B and 1C, the floor storage recess 50 is arranged along the longitudinal direction of the conductive rotating body 30 and is biased to one side of the elliptical short section of the conductive rotating body 30. It is provided on the rear side of the front facing inward. Therefore, when the conductive rotating body 30 is rotated about the rotating shaft 31, the flat surface 30a is rotated into the storage recess 41 and is raised.
It is stored in the storage recess inner surface 42 so as to be in surface contact therewith. further,
The rotation shaft 31 is mounted at a position lower than the floor 20 surface in the floor storage recess 50, and the flat surface 30a is flush with the floor 20 surface when the conductive rotating body 30 is stored in the floor storage recess 50. Is set to.

Further, in the present embodiment, when the electrically conductive rotary body 30 is housed in the floor housing recess 50, the rotation center side 14 of the electromagnetic shield door A is placed on the flat surface 30a which is flush with the floor surface 20.
At a position corresponding to the end portion on the side opposite to, a small protrusion 60 having a height that abuts on the lower portion of the door surface of the electromagnetic shield door A (FIG. 2). A cutout portion 70 is provided in the lower portion of the door surface of the electromagnetic shield door A with which the small protrusion 60 abuts.
In the present embodiment, the cutout portion 70 has the bottom end bottom portion 10
Is cut into an inverted L shape, and the vertical notch surface of the notch 70 allows the small protrusion 60 to be hooked and knocked down when the door is closed to rotate the conductive rotary body 30.

The notch 70 is cut at a point where the bottom end 10 of the lower end thereof is located slightly above the surface of the floor 20.
It is formed so that there is a gap between it and the surface. By forming in this way, even if the lower portion of the door pushes down the small protrusion 60 when the electromagnetic shield door A is closed, the flat surface 30a is prevented from being caught by the lower end bottom portion 10 of the door. When the door is closed, the state before and after the cutout portion 70 catches the small protrusion 60 and pushes down the metal plate-shaped conductive rotating body 30 to rotate the flat surface 30a into the storage concave portion 41 to stand up is shown in FIG. ), (C). In addition, FIG. 3 shows the rotation state of the conductive rotary body 30 in the portion without the small protrusions 60 when the door is closed. On the other hand, when the door is opened, if the electromagnetic shield door A is opened from the state of FIG.
However, the conductive rotating body 30 can be pushed down to be housed in the floor housing recess 50 by itself so as to be flush with the surface of the floor 20.

In the above embodiment, the cutout portion 70 is provided to prevent the lower end bottom portion 10 of the door from being caught by the flat surface 30a due to the push-down of the small protrusion 60. However, as shown in FIG.
The notch 70 may be formed to have an oblique cross section, and it is not necessary to limit the shape to the inverted L shape. Further, the cross-sectional shape of the conductive rotating body may be formed such that one side of the flat surface is formed into a circumferential surface shape, for example, a semi-circular cross section or a crescent cross section, which will be described in the above embodiment. Basically, a shape other than the plate shape may be used. However, when the side to be stored in the floor storage recess is formed on the peripheral surface, it is necessary to provide a rotation stopper so as not to rotate during passage on the flat surface when the door is opened. Further, in the present invention, one purpose is to eliminate the passage obstacle due to the step of the floor surface when the door is opened. Therefore, the bottom surface of the bottom of the electromagnetic shield door is a floor surface without a door frame. Although the floor storage recess is provided in the floor storage door, it is basically possible to provide a door frame on the floor side and provide a structure corresponding to the floor storage recess in the door frame.

[0017]

According to the present invention, when the electromagnetic shield door is opened, the conductive rotating body, which has been brought into conductive contact with the storage recess for ensuring conductivity, is rotated so that the floor surface of the doorway is exposed. Since it can be stored in one place, there is no step on the floor side and there is no obstacle to the passage of vehicles at the entrance and exit. Further, when the door is closed, the flat surface of the conductive rotating body is brought into contact with the inner surface of the storage recess provided in the electromagnetic shield door in a conductive state, so that the electromagnetic shield effect at the time of closing the door is also secured. In particular, the rotation of the conductive rotating body when the door is opened or closed causes the small protrusions on the flat surface to
It can be done by itself by hitting the electromagnetic shield door, so no special opening and closing device is required. for that reason,
The work of constructing the electromagnetic shield door can be saved, and the construction cost can also be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view (a) of an electromagnetic shield door according to an embodiment, a cross-sectional view (b) showing a rotating state of a conductive rotating body when a door is opened, and a cross-sectional view showing a rotating state of a conductive rotating body when a door is closed. Figure (c).

FIG. 2 is a perspective view showing a mounting state of small protrusions according to the embodiment.

FIG. 3 is a cross-sectional view (a) showing a rotating state of the conductive rotary body when the door is opened and a cross-sectional view (b) showing a rotating state of the conductive rotary body when the door is closed, in a portion having no small protrusion.

FIG. 4 is a cross-sectional shape of an electromagnetic shield door in a portion that abuts a small protrusion of a conductive rotating body.

[Explanation of symbols]

 10 Bottom Bottom Bottom 13 Door Frame 20 Floor 30 Conductive Rotating Body 30a Flat Surface 41 Storage Recessed Inner 42 Storage Inner Recessed Inner Surface 50 Floor Storage Recessed 60 Smaller Protrusion 70 Notch

Claims (4)

[Claims] 1. An electromagnetic shield door provided on a door frame of an entrance / exit of an electromagnetic shield room, wherein a bottom of the lower end of the electromagnetic shield door is provided with a storage recess opened toward the floor along the direction of the frontage of the door. hand,
A floor storage recess opening is provided in a floor portion facing the opening of the storage recess of the electromagnetic shield door at the position when the door is closed, and a rotation center is provided in the floor storage recess so that the flat surface stores the floor when opening the door. The flat surface is rotated into the recess so as to be flush with the floor surface, and when the door is closed, the flat surface is rotated into the storage recess from the floor storage recess so that the flat surface is brought into electrical contact with the storage recess inner surface. A conductive rotating body having a flat surface is provided in the floor storage recess, and a position corresponding to an end of the flat surface of the conductive rotating body opposite to the rotation supporting side of the electromagnetic shield door is disposed. An electromagnetic shield door characterized by having a small protrusion that abuts a notch in the lower part of the door surface when closing the shield door. 2. The cutout portion at the lower portion of the door surface is cut out from the lower end bottom portion of the electromagnetic shield door in a substantially inverted L shape, and the lower end bottom portion of the cutout portion is provided above the floor surface. The electromagnetic shield door according to claim 1, wherein the electromagnetic shield door is provided. 3. The floor storage recess has an inner bottom surface formed into a flat surface, and the conductive rotary member is formed into a substantially plate shape made of metal, and one plate surface has a flat surface provided with small protrusions. The electromagnetic shield door according to claim 1 or 2, wherein the other plate surface is a flat surface that can be in surface contact with the bottom surface of the floor storage recess. 4. The electromagnetic shield door, when the door is closed, the peripheral edge of the door surface is brought into contact with the door frame surface, and the small projection is on the front surface side of the door frame surface on the flat surface of the conductive rotary member. The electromagnetic shield door according to claim 1, 2 or 3, wherein the electromagnetic shield door is provided in the.