JP3810325B2 - Electromagnetic shielding door lower shield structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a door lower shield structure of an electromagnetic wave shield door that is installed at an entrance of an MRI room or the like of a hospital and prevents intrusion or leakage of electromagnetic waves.
[0002]
[Prior art]
In openings that are closed by doors such as the entrances and exits of rooms such as MRI rooms in hospitals, a conductive shield material is provided around the openings, and a slidable door is pressed against this shield material to shield electromagnetic waves. Has been done.
[0003]
[Problems to be solved by the invention]
The electromagnetic shielding door has a problem that a carriage such as a stretcher cannot be easily put in and out because the frame forming the opening protrudes from the floor surface.
In addition to this, when the lower part of the door body is inserted into the recessed groove formed on the floor surface, and the door body is moved horizontally to the opening surface side in front of the opening, the lower part of the door body is attached to the shield material in the recessed groove. However, in this configuration, there is a possibility that dirt, water, etc. may accumulate in the concave groove, which has a problem of adversely affecting the shielding effect.
An object of the present invention is to provide a shield structure in which there is no large step or groove on the floor surface of the opening, and a carriage such as a stretcher can easily enter and exit.
[0004]
[Means for Solving the Problems]
The door lower shield structure of the electromagnetic wave shield door of the present invention is a door lower shield structure of an electromagnetic wave shield door in which a slidable door body is horizontally moved in front of the opening frame and the door body is pressed against the opening frame and sealed. A conductive shield piece that is attached over the entire length of the bottom of the body, and V that is installed on the floor surface in front of the opening frame and that makes the shield piece contact when the door body moves horizontally toward the opening frame side. A conductive lower frame member having a letter-shaped groove formed on the upper surface thereof.
[0005]
In this means, the shield piece attached to the bottom of the door body comes into contact with the V-shaped groove formed in the lower frame material by the horizontal movement of pressing the door body toward the opening frame side, and the lower door is shielded. The configuration with the V-shaped groove eliminates the need to provide a large groove that allows the lower edge of the door to enter the floor as in the conventional case, and eliminates almost any step, making it easy to use a stretcher or other cart. You can go in and out.
[0006]
It is preferable that a plurality of the shield pieces are formed, and a plurality of V-shaped grooves for individually accommodating the plurality of shield pieces are formed on the upper surface of the lower frame member. In this configuration, by providing a plurality of shield pieces that act as shields and a plurality of corresponding V-shaped grooves, for example, by providing two and two strips, a double structure is obtained, and the shielding effect is further enhanced. Can do.
[0007]
The shield piece may be configured to be fixed to the door body via an L-shaped mounting bracket that can be attached and detached from the front or rear surface of the door body. In this configuration, the shield piece can be easily replaced in a state in which the door body is suspended, that is, in a state in which the door body can be normally opened and closed.
[0008]
It is preferable that the L-shaped mounting brackets to which the plurality of shield pieces are fixed are attached and detached from one side of the door body and the front side of the door body on the other side. The L-shaped bracket attached from the front or back is in a state where the part to which the shield piece is attached is cantilevered, so if multiple shield pieces are fixed to one mounting bracket, it is fixed to the bottom of the door There is a risk of hanging down. With this configuration, the mounting bracket can be prevented from hanging down.
[0009]
A corner portion of an L-shaped mounting bracket fixed to the door body from the opening frame side may have a cross-sectional shape that bulges into the opening frame. In this type of shield door, the shield material or push-in piece provided on the upper edge and both side edges of the door body reaches the lower end of the door body, and is provided in a state of protruding slightly to the opening frame side. In this configuration, the shield piece can be attached close to the opening frame side without impairing the appearance due to the bulging configuration, and a shielding gap can be improved without creating a large gap in the lower part in front of the opening frame. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. An example of an electromagnetic shielding door to which this door lower shield structure is applied is shown in FIG. An opening frame 1 is provided so as to form an entrance / exit of the MRI room, and the door body 2 moves to the left and right in the drawing along the front surface of the opening frame 1 to open / close the opening 3, that is, the entrance / exit. ing. Then, in the final stage of the closing operation in which the door 2 closes the opening 3, the door body 2 is moved in front of the opening frame 1 and then horizontally moved to the opening frame 1 side to be in a shield state. In this case, the shield structure on the upper part and both sides around the opening 3 is a packing-like shield material that is elastically deformed to the surface of the opening frame 1 against which the door body 2 is pressed, as seen in a sectional view in FIG. 4 are provided in parallel with each other, and the door body 2 is provided with two pushing pieces 5 corresponding to the shield material 4. The shield material 4 is made by imparting conductivity to rubber. For example, the shield material 4 is made by applying a conductive coating to the rubber by electroless plating, or coating a flexible metal net. The pushing piece 5 is a protrusion formed by bending a conductive metal plate, for example, a plate material of SUS304. Therefore, when the pushing piece 5 is pushed toward the shield member 4, the pushing pieces 5 are surely brought into close contact with each other and the upper edge and both sides of the opening 3 are in an electromagnetic shield state. Note that the packing-like shield material 4 may be provided on the door body 2 and the pushing piece 5 may be provided on the opening frame 1 side.
[0011]
The structure of the opening / closing drive part and the pressing drive part of the door body 2 is a conventionally well-known thing. As schematically shown in FIG. 1, the opening / closing drive unit is provided with a rail 7 straddling the upper position of the door body 2 in the closed position and the upper portion of the door pocket 6, and the door body 2 can be moved along the rail 7. The suspension part 9 is supported via a suspension part 9 with a trochanter 8 and is stretched separately and is driven and driven by an electric motor. It is connected. Although detailed illustration description is abbreviate | omitted to this suspending part 9, the door body 2 is supported so that it can slide horizontally to the opening frame 1 side, and a door body is always opened by the spring action. Pressing so that it is located a little away from the side. The door body 2 is opened and closed by the advance and retreat of the endless running strip 10.
[0012]
Since the pressing drive unit presses the door body 2 against the opening frame 1 side, for example, it is provided corresponding to the four corners of the door body 2 in the closed position, and the door body 2 located at the front side of the opening frame 1 is moved. A pressing cam 12 is arranged at a sandwiching position, and a pressing operation is performed at the final stage when the door body 2 is closed. The pressing cam 12 is provided on the same shaft 13 on the same side, and the shaft 13 is rotationally driven by an electric cylinder 14 so that the pressing cam 12 performs a pressing operation. This pressing operation is performed against the spring action. When the door body 2 is slid and the pressing action is released, the door body 2 returns to the original position slightly apart from the opening frame 1 side by the spring action. The configurations of the opening / closing drive unit and the pressing drive unit are not limited to such a configuration, and may be different configurations. In short, the door body may be configured to be slidable and can be slid horizontally in front of the opening frame and pressed around the opening frame.
[0013]
As shown in FIGS. 2 and 3, the lower shield structure of the lower edge of the opening 3 includes a shield piece 20 provided on the door body 2 side and a lower frame member 21 of the opening frame 1. The shield piece 20 is commercially available, and, for example, beryllium copper finger type shield material (sold by Kitagawa Industries Co., Ltd.) is used. As shown in FIG. 6, FIG. 7, etc., this shield material 4 has a projecting portion 23 in which a number of small tongue-like portions are similarly curved and projected at one edge of an elongated strip-shaped attachment portion. Yes, it is attached to the brackets 24 and 25 shown in FIGS. 4 and 5 as shown in FIGS. 6 and 7, and is attached to the bottom of the door body 2 as shown in FIGS. Each of the brackets 24 and 25 has an L-shaped cross section formed of a conductive metal plate, for example, SUS304, and has the same length as the bottom of the door body 2.
[0014]
The bracket 24 shown in FIG. 4 has a mounting plate portion 26 having an appropriate width to which a portion corresponding to one side of the L-shaped cross section is attached in contact with the surface of the lower portion of the door body 2 on the opening frame 1 side. In addition, as shown in FIG. 4B, the corner portion having an L-shaped cross section is bent and bulged on the side of the mounting plate portion 26, and the above-described pushing piece 5 is located at both ends. Correspondingly, notches 27 are respectively provided, and an appropriate number of screw insertion holes 28 for attaching to the door body 2 with screws are provided. A portion corresponding to the other side of the L-shaped cross section has a flat band shape with a width to which the shield piece 20 can be attached, and is arranged along the bottom surface of the door body 2 so as to slightly protrude from the lower surface thereof. 20 can be attached over the entire length, and several screw holes 29 for attaching the shield piece 20 are provided. FIG. 6 shows a state in which the shield piece 20 is attached to the bracket 24 with screws 30. The shield piece 20 is attached in a state where the curved protruding portion 23 protrudes downward.
[0015]
The bracket 25 shown in FIG. 5 is a mounting plate having an appropriate width to which a portion corresponding to one side of the L-shaped cross section is attached in contact with the surface of the lower portion of the door 2 opposite to the opening frame 1 side. The part 31 is formed, and an appropriate number of screw insertion holes 32 for attaching to the door body 2 with screws are provided. A portion corresponding to the other side of the L-shaped cross section has a flat band shape with a width to which one of the shield pieces 20 can be attached, and is disposed along the bottom surface of the door body 2 so as to slightly protrude from the lower surface thereof. The shield piece 20 can be attached over the entire length, and several screw holes 33 for attaching the shield piece 20 are provided. A state in which the shield piece 20 is attached to the bracket 25 with a screw 34 is shown in FIG.
[0016]
As shown in FIG. 2A, the bracket 24 with the shield piece 20 shown in FIG. 6 is attached to the front surface of the lower end of the door body 2 by a mounting screw 35, and the bracket 25 with the shield piece 20 shown in FIG. As shown in FIG. 2 (b), the door body 2 is attached to the back surface of the lower end of the door body 2 by an attachment screw 36. As shown in FIG. 3B, the two shield pieces 20 attached to the bottom of the door body 2 are parallel to each other with a gap therebetween, and the curved projecting portion 23 faces downward. As shown in FIGS. 3 (a) and 3 (b), the bracket 24 attached to the rear side of the door with the pushing piece 5 is neatly accommodated without impairing the appearance. The same applies to a case where a packing-like shield material 4 is provided on the door body 2 instead of the pushing piece 5.
[0017]
The lower frame member 21 is formed by bending a conductive metal plate, for example, a SUS304 plate member. As shown in FIGS. 2 and 3, the lower frame member 21 has a substantially rectangular shape with an open bottom surface and has a width of the opening frame 1. Two grooves 37 having a shallow V-shaped cross section along the longitudinal direction are provided in correspondence with the shield pieces 20 in the upper surface thereof in a corresponding required length. The V-shaped groove 37 has such a depth and width that the protrusion 23 of the shield piece 20 can move inside with a margin that does not contact when the door body is opened and closed. The angle formed by the slopes on both sides of the V-shaped groove is generally larger than 90 degrees. The lower frame member 21 is installed in a state where the upper surface protrudes slightly above the floor surface FL or the same as the floor surface. The door body 2 is provided so that the bottom surface is slightly higher than the floor surface, and a portion where the shield piece 20 of the bracket is attached can be inserted between the bottom surface and the lower frame member 21. That is, the door body 2 is opened, and the brackets 24 and 25 to which the shield piece 20 is attached are placed in a state where the shield piece 20 is positioned in the V-shaped groove 37 of the lower frame member 21. Is moved to a closed state, and the brackets 24 and 25 are screwed to the door body 2. Thus, the shield piece 20 can be attached to the door body 2 without being deformed. When the bracket is fixed to the door body 2, when the door body 2 is not pressed against the opening frame 1 side, the projecting portion 23 is located near the center in the V-shaped groove 37 and returns to the original projecting state. The inner surface of the V-shaped groove 37 is not contacted.
[0018]
When the electromagnetic wave shield door having the door lower shield structure configured as described above is closed in a shield state, the door body 2 moves and is pressed to the opening frame side in front of the opening frame 1. The pushing piece 5 comes into contact with the shield material 4 while being pressed, and the protrusion 23 of the shielding piece 20 is elastically pressed against the side surface of the V-shaped groove 37 as shown in FIG. To do. Therefore, the opening 3 of the opening frame 1 is closed, and there is no gap through which electromagnetic waves can pass between the opening frame 1 and the door body 2, and an electromagnetic wave shielding state is established. In the above-described example, the pushing piece 5 and the shield material 4 are provided in a double structure around the opening, and the shield piece 20 and the V-shaped groove 37 are provided in a double structure. Although the double structure is better, the electromagnetic shielding action is more reliable. Therefore, a double or more structure may be used. When the door body 2 is opened, the door body 2 is slid in a direction away from the opening frame 1 and then moved in the opening direction. As a result, the shield piece 20 and the shield material 4 are not damaged because they are not in contact with the V-shaped groove 37 and the pushing piece 5.
[0019]
Since the V-shaped groove 37 formed in the lower frame member 21 does not need to be formed with a very large depth or width, almost no step can be eliminated, and a carriage such as a stretcher can easily pass over it. Moreover, being V-shaped is easy to clean, hardly collects dust, and shield pieces are not easily damaged. Further, the configuration in which a plurality of the shield pieces 20 and the V-shaped grooves 37 corresponding thereto are provided can further ensure the shielding action.
[0020]
Moreover, since the structure which attached the shield piece 20 via the brackets 24 and 25 is attaching the brackets 24 and 25 to the front and back of the door body 2 with the screws 35 and 36, when replacing the shield piece 20, The operation of removing the door body 2 is not necessary, the door body 2 remains in a normal use state, the brackets 24 and 25 are removed from the front and rear surfaces of the door body, and the shield piece 20 is replaced. The shield piece can be easily replaced.
[0021]
【The invention's effect】
According to the first aspect of the present invention, since the V-shaped groove is provided, it is not necessary to provide a large groove that allows the lower edge of the door body to enter the floor surface as in the prior art, and almost no steps can be eliminated. It has the effect that a cart such as a stretcher can easily enter and exit.
According to the second aspect of the present invention, the shield effect can be further enhanced by providing a plurality of shield pieces that act as shields and a plurality of corresponding V-shaped grooves.
The invention according to claim 3 has an effect that the replacement work of the shield piece can be easily performed in a state in which the door body can be normally opened and closed.
The invention according to claim 4 has an effect of preventing the mounting bracket from hanging down.
The invention according to claim 5 has the effect that the shield piece can be attached close to the opening frame side without deteriorating the appearance, a large gap is not formed in front of the opening frame, and the shielding effect can be improved. Play.
[Brief description of the drawings]
FIG. 1 is a front view of an electromagnetic shield door to which the present invention is applied.
2A and 2B show an embodiment of the present invention, in which FIG. 2A is a front view of the lower part of the door, and FIG. 2B is a rear view of the lower part of the door;
3A is a cross-sectional view taken along line AA in FIG. 2A, FIG. 3B is a cross-sectional view taken along line BB in FIG. 2A, and FIG. It is BB sectional drawing of a different state (electromagnetic shielding state).
4A and 4B show the bracket 24 of the embodiment, where FIG. 4A is a front view, FIG. 4B is a right side view, and FIG. 4C is a bottom view.
5A and 5B show the bracket 25 of the embodiment, where FIG. 5A is a front view, FIG. 5B is a left side view, and FIG. 5C is a bottom view.
6A and 6B show a bracket 24 to which a shield piece of the embodiment is attached, wherein FIG. 6A is a front view, FIG. 6B is a right side view, and FIG. 6C is a bottom view.
7A and 7B show a bracket 25 to which a shield piece of the embodiment is attached, in which FIG. 7A is a front view, FIG. 7B is a left side view, and FIG. 7C is a bottom view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Opening frame 2 Door body 3 Opening 4 Shielding material 5 Pushing piece 6 Door pocket 7 Rail 8 Trochanter 9 Hanging part 10 Endless traveling strip 11 Connection part 12 Press cam 13 Shaft 14 Electric cylinder 20 Shielding piece 21 Lower frame material 23 Projection Portions 24 and 25 Bracket 26 Mounting plate portion 27 Notch portion 28 Screw insertion hole 29 Screw hole 30 Screw 31 Mounting plate portion 32 Screw insertion hole 33 Screw hole 34 Screw 35 and 36 Mounting screw 37 V-shaped groove

Claims (5)

A door lower shield structure of an electromagnetic wave shield door that horizontally moves a slidable door body in front of the opening frame and presses and seals the door body against the opening frame,
A conductive shield piece that is attached over the entire bottom of the door body, and is installed on the floor surface in front of the opening frame, and contacts the shield piece when the door body moves horizontally toward the opening frame side. And a conductive lower frame member having a V-shaped groove formed on the upper surface thereof. 2. The shield structure according to claim 1, wherein a plurality of the shield pieces are formed, and a plurality of V-shaped grooves for individually accommodating the plurality of shield pieces are formed on the upper surface of the lower frame member. 2. The shield structure according to claim 1, wherein the shield piece is attached to the door body through an L-shaped mounting bracket that can be attached and removed from the front surface or the rear surface of the door body. 3. The shield structure according to claim 2, wherein an L-shaped mounting bracket to which each of the plurality of shield pieces is fixed is attached and detachable from one side of the door body and the front side of the door body on the other side. Construction. 5. The shield structure according to claim 3, wherein a corner portion of an L-shaped mounting bracket that is fixed to the door body from the opening frame side has a cross-sectional shape that bulges into the opening frame. .

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