JP2585614Y2 - Step plate for electromagnetic shield door - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step board for an electromagnetic shield door provided at an entrance of an electromagnetic shield room or an anechoic chamber for measuring electronic equipment.

[0002]

2. Description of the Related Art An electromagnetically shielded room is a measurement space in which the floor, ceiling, and wall of a room are covered with a metal plate, a metal foil, or a metal net of a good conductor without interruption to prevent transmission of external waves such as broadcast waves. is there. In the anechoic chamber, radio wave absorbers that absorb radio waves are installed on the whole surface including the floor of the inner wall of the electromagnetic shield room or on the five inner walls excluding the floor to block external waves,
This measurement space is designed to prevent measurement radio waves used for measurement from leaking out and prevent electromagnetic waves reflected on the wall surface from affecting measurement results. An electromagnetically shielded room is usually constructed using a mirror surface (panel) whose entire surface or the inner surface and the entire periphery are covered with galvanized steel sheet, etc. When the door of the room is closed, it is connected to the metal plate on the wall and floor It is an electromagnetic shield door. FIG. 2 is a longitudinal sectional view showing a lower portion of the electromagnetic shield door. The electromagnetic shield door 1 is connected to a metal plate 2 (indicated by a line in the figure) covering the entire surface of a door made of a wood or metal frame, and has a cross section L with a free end protruding toward the closing side all around. This is a structure in which a tongue piece 3 having a letter shape is provided. The floor 4 and the wall (not shown) are provided with a step 5 for receiving the tongue 3, and a shield finger 6 or a shield mesh (not shown) disposed on the step 5 is provided.
Is connected to the floor 4 and the metal plate on the wall. The electromagnetic shield of the anechoic chamber has the same structure except that an electromagnetic wave absorber is fixed to the inner surface. As shown in FIG. 2, at the lower portion of the electromagnetic shield door 1, there is a step between the floor of the room and the floor on which the room is installed. The step is, for example, 20 mm to 50 mm. Therefore, every time heavy equipment is carried into or out of the electromagnetic shield room or anechoic chamber, as shown in the schematic sectional view of FIG. I was

[0003]

[Problems to be Solved by the Invention] Since the treads are for carrying in and out heavy equipment, they are rugged and heavy, so they need to be carried by many people, and it takes time to carry in the equipment.

[0004]

Means for Solving the Problems A rectangular recess is provided on the floor on which the electromagnetic shield room is installed, outside the electromagnetic shield door. The opening of the recess is closed with a tread plate, and the edge farther from the door of the tread plate is pivotally supported. Elevating means for keeping the edge of the tread plate closer to the door at the same height as the floor of the electromagnetically shielded room is provided in the recess. That is, in the present invention, on the installation floor where an anechoic chamber or an electromagnetic shield room is installed, a tread that closes an opening of a recess provided near the lower portion of the outer surface of the electromagnetic shield door, and separates from the door of the tread. Characterized in that lifting means for pivotally supporting the side edge and holding the side edge close to the door at the same height as the floor surface in the electromagnetically shielded room are provided in the recess, It is.

[0005]

When the door is fully opened, the elevating means operates to support the tread with the edge of the tread closer to the door being flush with the floor of the electromagnetically shielded room. The tread guides the transported equipment in the opposite direction from the floor of the electromagnetically shielded room to the installation floor, or from the installation floor to the floor of the electromagnetically shielded room, and always becomes the installation floor.

[0006]

FIG. 1 is a side view of an embodiment of the electromagnetic shield door tread according to the present invention in a state in which a main part is vertically cut. In FIG. 1, the electromagnetic shield door 1 is not shown because it is in an open state, and shows a step portion 5 and a shield mesh 8 of a floor portion 4 of a shield room. The concave portion 9 is a rectangular concave portion provided on the installation floor surface 16 close to the outer surface of the electromagnetic shield door 1, and is lined with a steel plate. The tread plate 10 is a steel thick plate having a size substantially covering the opening of the recess 9, and a flange 11 is provided on a bottom surface near an edge farther from the electromagnetic shield door 1, and an angle of an inner wall of the recess 9 is provided. At a bearing plate 12 projecting therefrom. Electromagnetic shield door 1 of tread plate 10
Is supported by an angle 17 near the opening of the concave portion 9 and is always flush with the installation floor surface as shown by the two-dot chain line in FIG. The elevating means comprises a support plate 13 having a roller 18 at the tip, a motor 14 and a link mechanism for connecting the two, and is arranged in a recess 9 near the electromagnetic shield door 1. The support plate 13 is pivotally mounted on a similar bearing plate 15 on the opposite side of the bearing plate 12, and is turned by a motor 14 in an upright direction via a link mechanism. While holding the free end of the tread plate 10 at the same height as the floor of the shield room, the tread plate 10 stands substantially upright as shown by the solid line. When the loading and unloading of the equipment are completed, the support plate 13 is turned in the opposite direction by the motor 14 so that the leading end enters the concave portion 9 and the roller 18 is separated from the tread plate 10 (shown by a two-dot chain line in FIG. 1). . The motor 14 is set so as to reciprocate by a predetermined angle only when the electromagnetic shield door 1 is fully opened.

[0007]

[Effects of the Invention] The tread according to the present invention is always a part of the installation floor surface and does not need to be moved, and one end is lifted up and down by an elevating means to form an inclined passage. Easy and safe loading of heavy equipment from the shield door,
Unloading can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a main part of an embodiment of a tread for an electromagnetic shield door of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of an electromagnetic shield door.

FIG. 3 is a longitudinal sectional side view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electromagnetic shield door 2 metal plate 3 tongue 4 floor 5 step 6 shield finger 7, 10 tread plate 8 shield mesh 9 recess 11 flange 12, 15 bearing plate 13 support plate 14 motor 16 installation floor 17 angle 1 roller

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E04F 11/00 E04F 11/02 E04F 15/00 E04G 27/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A tread plate that closes an opening of a concave portion provided near a lower portion of an outer surface of an electromagnetic shield door on an installation floor where an anechoic chamber or an electromagnetic shield room is installed, and a side of the tread plate separated from the door. A lifting means for pivotally supporting an edge of the door and holding an edge on a side close to the door at the same height as a floor surface in an electromagnetic shield room, provided in the recess.