JPH0316317Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic shielding door for an anechoic chamber or an electromagnetic shielding room.

[Conventional technology]

Recently, so-called anechoic chambers have come to be used for noise prevention experiments, etc., by installing radio wave absorbers indoors to absorb the reflected waves in the room, leaving only direct waves, in other words, a space where no electromagnetic waves are reflected at all. .

In addition to shielding external electromagnetic waves and noise, this anechoic chamber also absorbs electromagnetic waves emitted from high-frequency sources within the room and prevents the generation of reflected waves. It is used for experiments.

On the other hand, an electromagnetic wave shielding room prevents electronic devices from being affected by electromagnetic waves coming from outside.
Alternatively, in order to conduct experiments while preventing electromagnetic waves generated from electronic devices from escaping outdoors, install electromagnetic wave shielding material indoors to block electromagnetic waves coming from outside or generated indoors. It is a space structured in this way, and has come to be used frequently in recent years.

[Problem that the invention attempts to solve]

These anechoic chambers and electromagnetic shielding rooms have entrances with doors for experimenters to enter and exit and for experimental equipment to be taken in and out, so these doors are also covered with radio wave absorbing materials and electromagnetic shielding materials. Installed.

However, in order to open and close conventional doors, it is not possible to install sufficient radio wave absorbing material, or there are cases where the shielding between the door and the door holder is not sufficient, and as a result, the indoor main unit itself Despite being provided with sufficient radio wave absorbing properties and electromagnetic shielding properties, there is a problem in that electromagnetic waves are reflected or leaked near the door or its attachment part.

[Means for solving problems]

The purpose of this invention is to provide a door that eliminates the problems of reflection and leakage of electromagnetic waves caused by doors installed in anechoic chambers and electromagnetic shielding chambers as described above. Its structure is such that an entrance is formed on the wall of a room with a radio wave absorbing material or electromagnetic shielding material installed inside, and the outside of the entrance is large enough to cover the entrance, and the inside is equipped with a radio wave absorbing material. Or, in an electromagnetic shielding door consisting of a door equipped with an electromagnetic shielding material, the door is oriented perpendicularly to approximately the middle of the outer surface of the door in the front width direction and the outer side of the door on the wall surface. A shield structure is attached to the crane hinge via the shaft of the door, and has a cross-sectional shape on the outer surface around the entrance and the inner surface around the door, and has a shield structure in which a packing material made of a radio wave absorbing material or an electromagnetic wave shielding material is embedded in the groove. A crimping mechanism is attached to the door, with the groove sides facing each other so as to be staggered, and a crimping mechanism that is crimped so that the inner surface of the door and the packing body on the outer surface of the doorway engage with each other over the entire circumference. It is characterized by this.

[Effect]

When the door supported by the crane hinge begins to open or ends to close, the door recedes approximately straight from the opening or approaches the opening due to the action of the hinge. Therefore, even if a radio wave absorbing material or the like having a large protruding thickness (height) is attached to the inner surface of the door, it will not interfere with opening and closing of the door.

In addition, the sealing bodies attached to both surfaces of the opposing surfaces of the periphery of the door and the periphery of the opening are pressed together so as to mesh with each other, and this state is maintained, thereby ensuring shielding properties.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a front view showing an example of the door of the present invention installed in an anechoic chamber, Fig. 2 is a side view, Fig. 3 is a plan view, and Fig. 4 is an A surrounded by a broken line in Fig. 3. FIG. 5 is a side sectional view taken along the line in FIG. 4, showing an example of the crimping mechanism.

In these figures, reference numeral 1 denotes the wall surface of an anechoic chamber with a radio wave absorbing material attached to its inner surface, and the radio wave absorbing material is formed of, for example, a radio wave absorbing material 2 made of polyurethane foam in the shape of an acute pyramid. It is attached to the entire area of the ceiling, floor, etc. as well as the inner peripheral wall with its sharp end facing inward.

Reference numeral 3A denotes an opening having a rectangular front shape formed transparently in the wall surface 1, and 3 a door frame attached to the outer surface side of the wall surface 1 in which the opening 3A is formed. In addition, 1 in the figure
1b is a beam member, and 1c is a stile member.

The door frame 3 consists of a frontage part 31 that matches the wall opening 3A, and a front face part 32 that is formed continuously with this frontage part 31 and covers the outer surface side of the wall surface 1. Here, the door frame 3 is made of a steel plate. It is formed by still,
Reference numeral 33 represents a reinforcing member inserted into the back surface of the door frame 3, and 34 represents a connecting member for connecting the reinforcing member 33 and the support column 1a.

Reference numeral 4 denotes a door body disposed on the outer surface side of the wall surface 1 in the frontage portion 31 of the door frame 3, and this door body 4 is attached to the frontage portion 31 so as to be openable and closable by the structure described below. .

Reference numeral 51 denotes a bearing block provided at the upper and lower portions of the door body 4 in the front width direction, and this block 51 has a vertical pin hole (not shown) formed therein. Reference numeral 52 denotes a bearing block having the same structure as the block 51, and is attached to the front face 32 of the door frame 3 at the same height and in parallel with the block 51. Furthermore, these two blocks 51 and 52
In the front part 32 of the door body 4 and the door frame 3,
These are attached so as to protrude appropriately from the front surface.

53 consists of horizontal parallel members 53a, 53b and a connecting member 53c that connects and integrates these two members 53a, 53b.
The bearing blocks 51 and 52 are mounted on the opposite surface of the bearing block 3b.
The crane hinge main body is equipped with a pin 54 that fits into the pin hole of This means that it can be installed freely.

Here, the door body 4 has left and right bearing blocks 5 on both sides of the hinge body 53 when viewed from the front.
1 and 82, the door body 4 is supported by the left and right bearing blocks 51 and 82 during its opening and closing operations.
It performs rocking or angular rotation around the pin 54 of 52. In other words, the door main body 4 can be moved approximately linearly forward and backward relative to the frontage portion 31 near the beginning and end of the opening/closing operation.

However, although a radio wave absorber 21 similar to that 2 attached to the wall is attached to the indoor surface of the door body 4, even if this radio wave absorber 21 is installed, the linear The absorber 21 does not interfere with the opening and closing of the door body 4 by moving forward and backward.

Next, a shield structure 6 having a structure shown in FIG. 4 is attached to the outer peripheral inner surface 41 of the door body 4 and the outer peripheral edge 31a of the opening frontage 31, and this shield structure will be described later. It is adapted to be crimped and held by a crimping mechanism 7.

Thus, the shield structure 6 has cross-sectional engaging members 61, 61 arranged on the inner surface 41 of the outer peripheral portion of the door body 4 and the outer surface 31a of the frontage portion 31 so that their groove sides face each other alternately. At the same time, the grooves of both engaging members 61, 61 and this engaging member 61
A packing material 62 is embedded in the portion sandwiched between the edge 42 of the door body 4, and each packing material 62 is configured to elastically engage with the tip of the opposing engaging member 61 when the door is closed. has been done.

On the other hand, in the present invention, in order to maintain the elastic engagement between the packing material 62 and the engaging member 61 in a crimping manner, the crimping mechanism 7 shown in FIGS. 4 and 5 as an example
is attached as follows.

Here, a horizontal shaft 71 is provided in the middle of the height direction of the door body 4, and outward engaging pins 72 are implanted at both outer ends of this shaft 71 (i.e., on the left and right outer sides of the door body 4). An engaging portion is formed by providing a groove block 73a having an engaging groove 73 into which the pin 72 is fitted on both sides of the front surface of the door frame 3 corresponding to the engaging plate 72a. has been done.

This engaging portion allows the door body 4 to be opened and closed when the pin 72 of the engaging plate 72a is positioned directly above or near the engaging plate 72a by rotating the shaft 71. When the pin 72 is turned clockwise in the figure and reaches the position shown in FIG.
The elastic engagement between the packing material 62 and the engaging member 61 shown in FIG. 4 is forcibly pressed and held.

As the crimping mechanism 7, in addition to the one using the eccentric groove in the above example, there is also a mechanical clamp type (not shown) or a clamp mechanism using a hydraulic cylinder, etc., which connects the back of the door 4 to the front of the door frame 3. Any material that can be crimped and held is sufficient.

In FIGS. 1 to 3, 74 is a handle for rotating the shaft 71, and 75 is a gear box for transmitting the rotation of the handle shaft (not shown) to the shaft 71. Further, the handle 74 can also be provided on the indoor side.

[Effect of idea]

The present invention is as described above, and since the door provided at the entrance to the anechoic chamber or the electromagnetic shielding chamber is attached to the door so that it can be opened and closed freely using a crane hinge, the door is placed in the frontage of the opening near the beginning and end of the opening/closing operation of the door. It is possible to advance and retreat almost linearly, and as a result,
Even if a radio wave absorber or the like is attached to the inner surface (indoor side) of the door in the same way as that inside the room, this absorber will not interfere with the opening and closing of the door.

In addition, a packing material is provided on the outer periphery of the inner surface of the door and the opening opposite thereto, and a crimping mechanism is provided in which the packing material is crimped and held onto the other member, so that the radio wave absorption on the inner surface of the door is prevented. In conjunction with the effects of the body, etc., the radio wave absorption or electromagnetic wave shielding properties of the door and its vicinity can be made as sufficient as that of the indoor main body.

Therefore, the door of the present invention is extremely suitable as a door provided at the entrance of an anechoic chamber or an electromagnetic shielding chamber.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the door of the present invention installed in an anechoic chamber, Fig. 2 is a side view, Fig. 3 is a plan view, and Fig. 4 is an A surrounded by a broken line in Fig. 3. FIG. 5 is a cross-sectional side view taken along the line in FIG. 4, showing an example of the crimping mechanism. 1...Wall surface, 2...Radio wave absorber, 3...Door frame,
31... Frontage part, 32... Front part, 4... Door body, 51, 52... Bearing block, 53... Crane hinge body, 5... Pin, 6... Shield structure, 7... Crimping mechanism .

Claims (1)

[Scope of utility model registration request] An entrance/exit is formed on the wall of the room with a radio wave absorbing material or electromagnetic shielding material installed inside, and the outside of the entrance is large enough to cover the entrance, and the inside is equipped with a radio wave absorbing material or electromagnetic shielding material. In an electromagnetic wave shielding door consisting of a door with a door attached to it, the door is connected through an axis perpendicular to approximately the middle of the outer surface of the door in the front width direction and the outer side of the door on the wall surface. At the same time, shield structures are installed alternately on the outer surface around the entrance and the inner surface around the door, and the shield structure has a cross-sectional shape and a packing material made of a radio wave absorbing material or an electromagnetic wave shielding material is embedded in the groove. A crimping mechanism is attached to the door so that the groove sides thereof face each other, and the packing body on the inner surface of the door and the outer surface of the doorway are crimped so that they engage with each other over the entire circumference. Electromagnetic shield door.