Radiation shielding door

Abstract

The present invention provides a radiation shielding door that allows the shielding function to be changed by replacing the type of block, even after the door structure has been installed. [Solution] The radiation shielding door comprises a door frame provided in an opening Wa formed in a wall W, and a door body 2 that can open and close the opening Wa. The door body 2 has an opening surface that communicates with the internal space of the door body 2, and a plurality of blocks 23, 23, ... are inserted vertically into the internal space. The blocks 23, 23, ... have a radiation shielding function and can be inserted from the opening surface.

Description

Technical Field

[0001] This disclosure relates to a radiation shielding door having a radiation shielding function.

Background Art

[0002] Conventionally, a door structure having a radiation shielding function has been known (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 describes a configuration in which an inner member having a radiation shielding function is provided inside a door body. According to the configuration described in Patent Document 1, it was difficult to change the shielding function after the installation of the door structure. Therefore, an object of the present disclosure is to solve the above problems.

Means for Solving the Problems

[0005] The radiation shielding door according to the first aspect of the present invention is a radiation shielding door including a door frame provided in an opening formed in a wall body and a door body capable of opening and closing the opening, wherein an opening surface communicating with an internal space of the door body is formed in the door body, a plurality of blocks are inserted in the vertical direction in the internal space, and the blocks have a radioactive shielding function and can be inserted from the opening surface.

[0006] According to the radiation shielding door according to the first aspect, even after the installation of the door structure, the shielding function can be changed by exchanging the types of blocks.

[0007] In the radiation shielding door relating to the first point of view described above, the block material can be concrete, polyethylene, mortar, palladium, etc.

[0008] A radiation shielding door according to a second aspect of the present invention is a radiation shielding door according to the first aspect, wherein the internal space is formed with a plurality of insertion parts divided in the vertical direction, and the block can be inserted into each of the insertion parts from the opening surface.

[0009] According to the radiation shielding door relating to the second point described above, it becomes possible to smoothly insert multiple blocks into the internal space of the door body.

[0010] A radiation shielding door according to a third aspect of the present invention is a radiation shielding door according to the second aspect, wherein the upper surface of the block has an engaging portion formed for engaging with another block above it, and the lower surface of the block has an engaged portion formed for engaging with another block below it.

[0011] According to the radiation shielding door described in the third point above, it is possible to suppress the leakage of radiation through gaps in the block.

[0012] A radiation shielding door according to a fourth aspect of the present invention is a radiation shielding door according to the third aspect described above, wherein the door body is provided with a cover member that shields the opening surface.

[0013] According to the radiation shielding door relating to the fourth point of view described above, the block can be held stably.

[0014] A radiation shielding door according to a fifth aspect of the present invention is a radiation shielding door according to the fourth aspect described above, wherein the door body is rotatably assembled to the door frame via a hinge, and the opening surface is formed on the door edge side of the door body.

[0015] According to the radiation shielding door described in the fifth point above, it becomes possible to easily replace the blocks after the door structure has been installed.

[0016] The radiation shielding door according to the sixth aspect of the present invention is the radiation shielding door according to the fifth aspect, and a handle is provided on each of the blocks on the side of the opening surface.

[0017] According to the radiation shielding door according to the sixth aspect, it is possible to easily replace the blocks.

[0018] The radiation shielding door according to the seventh aspect of the present invention is the radiation shielding door according to the sixth aspect, and the handle is detachable from the block.

[0019] According to the radiation shielding door according to the seventh aspect, the space for the handle inside the door body becomes unnecessary.

[0020] The radiation shielding door according to the eighth aspect of the present invention is the radiation shielding door according to the seventh aspect, a female screw portion is formed on the block, a male screw portion is formed on the handle, and the handle is assembled to the block by screwing the male screw portion and the female screw portion together.

[0021] According to the radiation shielding door according to the eighth aspect, it is possible to easily attach and detach the handle.

Brief Description of the Drawings

[0022] [Figure 1] Front view showing the weight door (radiation shielding door) according to the present embodiment. [Figure 2] Perspective view showing the internal structure of the door body. [Figure 3] (a) and (b) are respectively plan views showing the closed state and the open state of the door body. [Figure 4] Plan sectional view showing the closed state of the door body. [Figure 5] Cross-sectional view taken along line A-A in FIG. 4. [Figure 6] Plan sectional view showing the sealed state of the door body. [Figure 7] Cross-sectional view taken along line B-B in FIG. 6. [Figure 8](a) is a plan view showing the shape of the rod, and (b) to (d) are plan views showing the magnitude of the reaction force that the rod receives from the pressure pin. [Figure 9] Front view showing the hinge configuration. [Figure 10] (a) and (b) are cross-sectional views of the door in the closed and sealed states in Figure 9, along line CC. [Figure 11] (a) and (b) are front views showing the handle regulating section in the closed and open states of the door body, respectively. [Figure 12] Cross-sectional view of line DD in Figure 11. [Figure 13] (a) and (b) are a front view showing the arrangement of the regulating members and a plan view of the regulating members when the door is in the open position, respectively. [Figure 14] (a) and (b) are front views showing the arrangement configuration of modified versions of the restricting member, and a plan view of the restricting member when the door is in the open position, respectively. [Modes for carrying out the invention]

[0023] [Heavy Door (Radiation Shielding Door) 1] First, the overall configuration of the heavy door 1, which is one embodiment of the radiation shielding door according to the present invention, will be explained using the figures. In this embodiment, the front side of the paper shown in Figure 1 is the front of the heavy door 1, and the depth side of the paper is the rear of the heavy door 1. Also, the right side (the tail end of the door body 2) shown in Figure 1 is the right side of the heavy door 1, and the left side (the leading end of the door body 2) is the left side of the heavy door 1.

[0024] In this embodiment, the heavy-duty door 1 consists of a door frame (door tail frame 4, door edge frame 5, upper frame 6, and lower frame 7) provided along an opening Wa (see Figure 3) formed in the wall W, and a door body 2 connected to the door frame (door tail frame 4) via two hinges 3.3. Handles 8 and 9 are provided on the front and rear surfaces of the door body 2, respectively.

[0025] In the heavy door 1 according to this embodiment, the door body 2 is displaceable between an open state in which it is separated from the opening Wa as shown in Figure 3(b), a closed state in which it is close to the opening Wa and a gap is formed between it and the door frame as shown in Figures 3(a) and 4, and a closed state in which it abuts the door frame and seals the opening Wa as shown in Figure 6.

[0026] In the heavy door 1 according to this embodiment, as shown in Figures 4 and 6, a protruding portion 21c is provided on the peripheral edge of the rear surface of the door body 2 (the rear surface of the door main body portion 21, which will be described later), and a packing P is installed on the outer peripheral edge of the door frame. As a result, when the door body 2 is tightened to the door frame and is in a sealed state, the protruding portion 21c is pressed against the packing P, and the space between the door body 2 and the door frame is sealed. In this way, the packing P is used to seal the space between the door body 2 and the door frame when the door body 2 is in close proximity to the door frame.

[0027] In this embodiment, the gasket P is provided on the door frame, but it is also possible to provide the gasket P on the door body 2, or on both the door body 2 and the door frame. Furthermore, it is also possible to have a configuration without gasket P, or a configuration with double gasket P.

[0028] [Door Panel 2] In the heavy-duty door 1 according to this embodiment, the door body 2 is configured as shown in Figure 3, comprising a door main body portion 21 and a door insertion portion 25 that protrudes from the rear side of the door main body portion 21. The door main body portion 21 is the part whose rear surface abuts against the door frame to seal the opening Wa. The door insertion portion 25 is formed to be slightly smaller than the door main body portion 21 and is the part that is inserted inside the door frame as shown in Figure 3(a).

[0029] As shown in Figure 2, the door body 21 of the door unit 2 has an opening on its left side (door edge side) that communicates with the interior space. Multiple blocks 23, 23, etc. are inserted vertically into the interior space of the door body 21. Each block 23 has a radiation shielding function and can be inserted into the interior space from the opening of the door body 21. With these blocks 23, 23, etc., the heavy door 1 according to this embodiment is configured as a radiation shielding door.

[0030] In the heavy door 1 according to this embodiment, the radiation shielding function can be changed by replacing the type of block 23 even after the door body 2 has been assembled and installed in the door frame. The block 23 can be made of concrete, polyethylene, mortar, palladium, or the like.

[0031] Furthermore, in this embodiment, the opening surface of the door body 21 is formed on the door edge side of the door frame 2. This eliminates the need to remove the door frame 2 from the hinge 3 when replacing the block 23, even after the door frame 2 has been assembled and installed. In other words, it becomes possible to easily replace the block 23 after the heavy door 1 has been installed.

[0032] As shown in Figure 2, the internal space of the door body 21 is divided vertically by the block guide 21a to form multiple insertion sections, and a block 23 can be inserted into each of these insertion sections from the opening. This makes it possible to smoothly insert multiple blocks 23 into the internal space of the door body 21.

[0033] In this embodiment, each block 23 is formed in a prism shape, but the blocks 23 can also be of other shapes. For example, it is possible to form an engaging portion on the upper surface of block 23 that engages with another block 23 above it, and to form an engaged portion on the lower surface of block 23 that engages with another block 23 below it. This allows the gap between blocks 23 and 23 to be sealed by the engaging portion, thereby suppressing radiation leakage from the gap between blocks 23 and 23.

[0034] A cover member 22 is provided on the left side of the door body 21 to shield the opening surface. In the heavy door 1 according to this embodiment, by shielding the opening surface of the door body 21 with the cover member 22, it is possible to stably hold multiple blocks 23, 23, etc.

[0035] As shown in Figure 2, in the heavy door 1 according to this embodiment, each of the blocks 23 is provided with a handle 24 on the opening side. This makes it possible to easily replace the blocks 23.

[0036] In this embodiment, the block 23 has a female threaded portion 23a. The handle 24 also has a male threaded portion (not shown). The handle 24 is assembled to the block 23 by screwing the male threaded portion and the female threaded portion 23a together. By making the handle 24 detachable from the block 23 in this way, the space required for the handle 24 inside the door body 21 can be eliminated.

[0037] [Hinge 3] As shown in Figure 1, the heavy door 1 according to this embodiment is equipped with a pair of upper and lower hinges 3-3 as a support structure that rotates and displaces the door body 2 between an open state and a closed state. In this embodiment, the upper hinge 3 and the lower hinge 3 are configured to be substantially the same in shape and symmetrical vertically. The upper hinge 3 will be described below, and a detailed explanation of the lower hinge 3 will be omitted.

[0038] As shown in Figures 1 and 9, the hinge 3 comprises a fixed hinge 31, a movable hinge 32, and a pivot shaft 33. In the hinge 3, the fixed hinge 31, which is fixed to the door frame 4, and the movable hinge 32, which is assembled to the door body 2, are connected via the pivot shaft 33 so as to be rotatable relative to each other. As a result, the door body 2 is assembled to the door frame so as to be rotatable relative to it via the hinge 3.

[0039] In the heavy door 1 according to this embodiment, the hinge 3 includes a hinge-side support portion 34, a door-side support portion 35, a guide member 36, a guide holding portion 37, and a hinge spring 38, etc., as a sliding displacement mechanism that allows the door body 2 to move closer to and further away from the door frame between a closed state and a sealed state.

[0040] In the sliding displacement mechanism, the hinge-side support portion 34 is fixed to the movable hinge 32, and the door-side support portion 35 is fixed to the door body portion 21 of the door body 2. The hinge-side support portion 34 and the door-side support portion 35 are connected by a guide member 36 so as to be slidable in the front-rear direction (thickness direction of the door body 2).

[0041] The guide member 36 consists of a fixed guide 36a and a movable guide 36b, which are engaged via bearings (not shown) to allow for smooth relative sliding displacement. The fixed guide 36a is fixed to the hinge-side support portion 34, and the movable guide 36b is fixed to the door-side support portion 35 via a guide holding portion 37.

[0042] As shown in Figure 10, two restricting pieces 34a and 34a are formed at both the front and rear ends of the hinge-side support portion 34, facing toward the door-side support portion 35. These restricting pieces 34a and 34a restrict the sliding range of the movable guide 36b.

[0043] As described above, in the heavy door 1 according to this embodiment, the sliding displacement mechanism allows the door body 2 to be brought close to the door frame while maintaining a position parallel to the door frame. Therefore, the timing of contact between the door body 2 and the door frame can be synchronized, and the door body 2 and the door frame can be smoothly sealed, improving operability.

[0044] Furthermore, in this embodiment, the sliding displacement mechanism allows the timing of contact between the packing P and the opposing protruding portion 21c to be synchronized. This suppresses friction between the packing P and the protruding portion 21c.

[0045] In the heavy door 1 according to this embodiment, the slide displacement mechanism includes two hinge springs 38, 38, which are compression springs, as biasing means for biasing the door body 2 in the direction of closing. As shown in Figure 10(a), the hinge spring 38 is interposed between a spring receiving portion 34b that protrudes from the hinge-side support portion 34 toward the door-side support portion 35 and a compression portion 35a that protrudes from the door-side support portion 35 toward the hinge-side support portion 34.

[0046] As described above, the door-side support 35 and the door body 2 are always biased by an elastic force directed forward. In other words, the door body 2 is biased in the direction away from the door frame by the elastic force of the hinge spring 38. Furthermore, even if the door body 2 is displaced to the rear and compresses the hinge spring 38 as shown in Figure 10(b), the door body 2 returns to the front position as shown in Figure 10(a) due to the elastic force of the hinge spring 38. Thus, in this embodiment, the door body 2 is biased in the direction away from the door frame.

[0047] In this embodiment, the hinge 3 is equipped with a sliding displacement mechanism that allows the door body 2 to move closer to and further away from the door frame between a closed state and a sealed state. However, the sliding displacement mechanism can also be used in configurations other than hinged doors. For example, the heavy door 1 may be equipped with a sliding support part that slides the door body 2 between an open state and a closed state in a direction perpendicular to the thickness direction of the door body 2 (left-right direction or up-down direction), and the sliding displacement mechanism may be provided on this sliding support part. In other words, it is also possible to configure the heavy door 1 as a sliding door and provide a sliding displacement mechanism.

[0048] Even when the heavy door 1 is configured as a sliding door as described above, the sliding displacement mechanism allows the door body 2 to be brought close to the door frame while maintaining a position parallel to the door frame. Therefore, the timing of contact between the door body 2 and the door frame can be synchronized, and the door body 2 and the door frame can be smoothly sealed, improving operability.

[0049] [Pressing means] The heavy door 1 according to this embodiment is equipped with a pressing means that brings the door body 2 from a closed state to a sealed state by making it tightly adhere to the door frame. As shown in Figures 4 and 5, the pressing means includes a handle 9, a shaft member 41, a pinion gear 43, a rack (upper rack 44a and lower rack 44b), a first connecting member 45a, a second connecting member 45b, a rod 50, and a pressing pin 53, etc.

[0050] As shown in Figure 4, the handles 9, 9 provided on both sides of the door body 2 in the heavy door 1 are connected so as not to be able to move relative to each other by a shaft member 41 that penetrates the door body 2. The shaft member 41 is supported by a shaft holding part 42 fixed to the rear surface of the door body 21. That is, the handles 9, 9 are provided so as to be able to rotate in a direction perpendicular to the door body 2, with the axis direction of the shaft member 41, which is the pivot axis, facing in that direction.

[0051] As shown in Figure 5, a pinion gear 43 is integrally provided on the shaft member 41 within the internal space of the door insertion section 25. An upper rack 44a that meshes with the pinion gear 43 is provided above the pinion gear 43, and a lower rack 44b that meshes with the pinion gear 43 is provided below the pinion gear 43. The upper rack 44a and the lower rack 44b are arranged with their longitudinal directions facing left to right.

[0052] Rack guides 46 equipped with rack rollers 46a are positioned above the upper rack 44a and below the lower rack 44b. That is, the upper rack 44a and the lower rack 44b are sandwiched from above and below by the pinion gear 43 and the rack guides 46, allowing them to move back and forth in the left and right directions by the rotation of the pinion gear 43. In this embodiment, as shown in Figure 7, the upper rack 44a is positioned to advance to the left (towards the leading edge of the door body 2), and the lower rack 44b is positioned to advance to the right (towards the trailing edge of the door body 2).

[0053] As shown in Figure 7, the central part of the first connecting member 45a, which is a rod-shaped member with its longitudinal direction oriented vertically, is fixed to the left end of the upper rack 44a. The central part of the second connecting member 45b, which is a rod-shaped member with its longitudinal direction oriented vertically, is fixed to the right end of the lower rack 44b.

[0054] The first connecting member 45a has two first guided portions 45c formed at its upper and lower ends, each with a guide groove. Similarly, the second connecting member 45b also has two second guided portions 45d formed at its upper and lower ends, each with a guide groove. The first guided portions 45c and the second guided portions 45d are guided to slide in the left-right direction by a connecting guide 47, which is a guide member equipped with a connecting roller 47a. In this embodiment, the connecting guide 47 makes it possible to stably slide the first connecting member 45a and the second connecting member 45b in the left-right direction.

[0055] A first roller 45e is provided at the lower end of the first connecting member 45a. Similarly, a second roller 45f is provided at the lower end of the second connecting member 45b. The first roller 45e and the second roller 45f are rotatable on the upper surface of a support member 48 provided inside the door insertion portion 25 of the door body 2. In this embodiment, by allowing the first roller 45e and the second roller 45f to roll on the upper surface of the support member 48, the first connecting member 45a and the second connecting member 45b can be more stably slid and displaced in the left-right direction.

[0056] As shown in Figure 5, two rods 50, 50 extending to the left are fixed to both the upper and lower ends of the first connecting member 45a. Similarly, two rods 50, 50 extending to the right are fixed to both the upper and lower ends of the second connecting member 45b. An inclined surface 50a facing forward and outward is formed at the tip of each rod 50.

[0057] Each rod 50 is supported by being inserted into a rod guide 51. When the first connecting member 45a and the second connecting member 45b slide in the left-right direction, the four rods 50 slide inside the rod guide 51 and are able to extend outward in the left-right direction from the door insertion portion 25.

[0058] As shown in Figures 4 and 5, in the heavy door 1 according to this embodiment, four pressure pins 53 supported by pin support parts 52 are fixed to the door frame (door end frame 4 and door front frame 5) at positions opposite to each rod 50. When each rod 50 extends outward in the left-right direction from the door insertion part 25, the inclined surface 50a of the rod 50 comes into contact with the pressure pin 53, as shown in Figures 6 and 7.

[0059] In the pressing mechanism configured as described above, when the user rotates the handle 9 counterclockwise in Figure 5, the handle 9 rotates the pinion gear 43 as shown in Figure 7, causing the upper rack 44a and the lower rack 44b to slide outward in the left-right direction. As a result, the first connecting member 45a and the second connecting member 45b slide outward, and the four rods 50 extend outward in the left-right direction from the door insertion portion 25.

[0060] As a result, as shown in Figure 6, the inclined surface 50a comes into contact with the pressing pins 53 fixed inside the door frame 4 and door frame 5, respectively, and the door body 2 is pressed backward (towards the door frame). Thus, in this embodiment, the pressing means housed inside the door body 2 is configured to displace the upper rack 44a and the lower rack 44b by operating the handle 9, thereby pressing the door body 2 against the door frame. In other words, in the heavy door 1, the pressing means is configured to bring the door body 2 into close contact with the door frame, changing it from a closed state to a sealed state.

[0061] Furthermore, in the heavy door 1, the displacement of the upper rack 44a and the lower rack 44b causes the rod 50 to extend in the direction of the door frame, and the inclined surface 50a formed at the tip of the rod 50 comes into contact with the pressing pin 53, thereby pressing the door body 2 in a direction that creates a sealed state. In this way, this embodiment makes it possible to create a sealed state for the door body 2 with a simple configuration.

[0062] Furthermore, in the heavy door 1, pressing pins 53 are provided on both the left and right sides of the door frame, and the rack is composed of an upper rack 44a positioned above the pinion gear 43 and a lower rack 44b positioned below the pinion gear 43. The rod 50 comprises one rod 50 that extends to the left due to the displacement of the upper rack 44a, and the other rod 50 that extends to the right due to the displacement of the lower rack 44b. The two rods 50 are configured to contact the left and right pressing pins 53, respectively. In this way, it is possible to apply an equal pressing force to the door body 2 on both the left and right sides by the pressing means.

[0063] Furthermore, in the heavy door 1, pressing pins 53 are provided on the upper and lower sides of both the left and right sides of the door frame, and the upper rack 44a and lower rack 44b are each provided with a first connecting member 45a and a second connecting member 45b having a longitudinal direction in the vertical direction. The left rod 50 and the right rod 50 are provided on the upper and lower sides of the first connecting member 45a and the second connecting member 45b, respectively. The left rod 50 and the right rod 50 are configured to abut against the upper and lower pressing pins 53 on both the left and right sides. This makes it possible to apply an even pressing force to the door body 2 from the pressing means both vertically and horizontally.

[0064] [Rod 50] As shown in Figure 8(a), the inclined surface 50a formed on the rod 50 comprises a first surface C1 formed on the tip side of the rod 50 and a second surface C2 formed continuously with the first surface C1. In a plan view (cross-sectional view passing through the axis of the rod 50), the cutting line between the first surface C1 and the second surface C2 is formed in the shape of a circular arc. Furthermore, the radius of curvature R1 of the first surface C1 (distance between the first surface C1 and the first virtual center O1) is formed to be smaller than the radius of curvature R2 of the second surface C2 (distance between the second surface C2 and the second virtual center O2).

[0065] In the rod 50, by forming the inclined surface 50a into the above shape, the angle formed by the tangent line between the inclined surface 50a and the pressing pin 53 and the axis of the rod 50 becomes smaller as the rod 50 extends. Specifically, as shown in FIGS. 8(b) to (d), the angle formed by the tangent line between the inclined surface 50a and the pressing pin 53 and the axis of the rod 50 is such that the angle α1 in FIG. 8(b) > the angle α2 in FIG. 8(c) > the angle α3 in FIG. 8(d).

[0066] As a result, as shown in FIGS. 8(b) to (d), even if the reaction force F received from the pressing pin 53 increases as F1 < F2 < F3 as the rod 50 extends, the change in the magnitude of the component forces Fa1, Fa2, and Fa3 resolved in the axial direction of the rod 50 can be made small. Thus, even if the extension length of the rod 50 increases and the reaction force received from the pressing pin 53 increases, an increase in the force required for the operation of the handle 9 (the reaction force received in the axial direction of the rod 50) can be suppressed. In other words, even if the reaction force that the rod 50 receives from the pressing pin 53 increases, the handle 9 can be smoothly operated.

[0067] [Handle restricting portion 60] As shown in FIGS. 5, 11, and 12, the weighted door 1 according to the present embodiment includes a handle restricting portion 60 that restricts the operation of the handle 9 when the door body 2 is in the open position. As shown in FIG. 11, the handle restricting portion 60 includes a restricting member 61, a restricting projection 62, a restricted portion 63, a release pin 65, and the like.

[0068] In the handle restricting portion 60, the restricting member 61 is a plate-like member that restricts the operation of the handle 9. The lower left portion of the restricting member 61 is rotatably supported by the door main body portion 21 by a rotating shaft 61a. The restricting member 61 is vertically rotatably displaced between a lower restricting position that restricts the operation of the handle 9 as shown in FIG. 11(b) and an upper release position that releases the restriction of the operation of the handle 9 as shown in FIG. 11(a). A long hole 61b is opened above the rotating shaft 61a in the restricting member 61.

[0069] A restricting projection 62 that protrudes downward is fixed to the right end of the restricting member 61. As shown in Figures 11(b) and 12, a restricted portion 63 that supports the restricting member 61 when it is in the restricted position is fixed to the rear surface of the second connecting member 45b.

[0070] As shown in Figure 11(b), when the restricting member 61 is in the restricted position, the restricted portion 63 is restricted from moving to the right by the restricting projection 62. That is, the sliding displacement of the second connecting member 45b to the right and the operation of the handle are restricted. As shown in Figure 11(a), when the restricting member 61 is in the released position, the restricting projection 62 retracts upward, so the restricted portion 63 is not restricted from moving to the right. That is, the sliding displacement of the second connecting member 45b to the right and the operation of the handle become possible.

[0071] In the handle restricting section 60, the release pin 65 is a rod-shaped member that releases the restriction by the restricting member 61. The release pin 65 is supported by pin holding sections 64, 64 so as to be slidable in the left-right direction, extending to the right from the door insertion section 25 of the door body 2. The right end of the release pin 65 is provided with a tip 65a, and the left end is provided with an engaging rod 65b that protrudes rearward (see Figure 12).

[0072] As shown in Figure 12, the engaging rod 65b of the release pin 65 is inserted into the elongated hole 61b of the regulating member 61. As shown in Figure 11(a), when the release pin 65 is on the left side, the regulating member 61 is rotated counterclockwise by the release pin 65 to the released position. As shown in Figure 11(b), when the release pin 65 is on the right side, the regulating member 61 is rotated clockwise by the release pin 65 to the regulated position.

[0073] In the heavy door 1 according to this embodiment, as shown in Figure 11(a), when the door body 2 is in the closed position, the release pin 65 of the handle restricting portion 60 is pressed into the inside of the door insertion portion 25 by the door frame (door tail frame 4). As a result, the restricting member 61 is displaced to the released position. On the other hand, as shown in Figure 11(b), when the door body 2 is in the open position, the restricting member 61 of the handle restricting portion 60 is displaced to the restricted position by its own weight, and the release pin 65 extends to the outside of the door insertion portion 25.

[0074] As described above, in the heavy door 1 according to this embodiment, the handle restricting section 60 is configured such that the restriction is not released by the release pin 65 when the door body 2 is in the open state, thereby restricting the operation of the handle 9. This suppresses the extension of the rod 50 when the door body 2 is in the open state, and prevents the rod 50 from colliding with the door frame and being damaged when the extended rod 50 is in the open state of the door body 2.

[0075] Furthermore, in this embodiment, the release pin 65 of the handle restricting section 60 is positioned to extend toward the pivot point side (the tail end side) of the door body 2. This allows the release pin 65 to be pressed by the tail end frame 4 by rotating the door body 2 from the open state to the closed state, thereby releasing the restriction by the restricting member 61.

[0076] Furthermore, in this embodiment, the restricting member 61 of the handle restricting section 60 restricts the displacement of the lower rack 44b by restricting the displacement of the second connecting member 45b to the right, thereby restricting the operation of the handle 9. In this way, by restricting the operation of the pressing means using a pinion gear 43 whose axial direction is perpendicular to the surface of the door body 2 with the restricting member 61, it is possible to make the dimensions of the handle restricting section 60 in the thickness direction more compact.

[0077] [Door control section 70] As shown in Figures 3 and 13, the heavy-duty door 1 according to this embodiment is equipped with a door restricting section 70 for restricting the opening angle from the door frame when the door body 2 is in the open position. The door restricting section 70 is composed of a shaft section 71, a restricting member 72, a restricting roller 73, and a cushioning member 74, etc. It is also possible to provide the restricting member 72 on the door frame.

[0078] As shown in Figure 13(a), the restricting member 72 in the door restricting section 70 is interposed between the upper surface of the door insertion section 25 in the door body 2 and the door frame (upper frame 6). The base end of the restricting member 72 is rotatably supported by the upper frame 6 via the shaft portion 71.

[0079] A regulating roller 73 is provided at the tip of the regulating member 72. The regulating roller 73 is inserted into a rail 25a provided on the upper surface of the door insertion portion 25. By allowing the regulating roller 73 to roll inside the rail 25a, the opening and closing operation of the door body 2 can be made smooth.

[0080] In this embodiment, the rail 25a of the heavy door 1 is provided with a buffer member 74 against which the regulating roller 73 abuts when the door body 2 is in the open position. The buffer member 74 comprises a main body portion 74a fixed to the rail 25a, a contact portion 74b that abuts against the regulating roller 73, and a compression spring 74c interposed between the main body portion 74a and the contact portion 74b.

[0081] According to the heavy door 1 of this embodiment, when the door body 2 is in the open position, the impact applied to the restricting member 72 can be absorbed by the cushioning member 74, as shown in Figure 13(b). Therefore, it is possible to suppress damage to the restricting member 72.

[0082] Furthermore, in this embodiment, as shown in Figure 13(b), the contact surface of the contact portion 74b with the regulating roller 73 is formed in a concave shape that conforms to the outer shape of the regulating roller 73. This makes it possible to improve the shock absorption when the regulating roller 73 comes into contact with the cushioning member 74.

[0083] As shown in Figures 14(a) and (b), the position of the buffer member 74 in the door regulating section 70 according to this embodiment is variable within the rail 25a in the longitudinal direction of the rail 25a (the fixed position of the main body 74a). As a result, the opening angle of the door body 2 by the regulating member 72 is changed depending on the position of the buffer member 74. Specifically, as shown in Figures 14(a) and (b), by displacing the position of the main body 74a toward the door edge side of the door body 2 compared to Figures 13(a) and (b), the opening angle of the door body 2 is reduced. Thus, according to this embodiment, the opening angle of the door body 2 can be easily adjusted by adjusting the position of the buffer member 74.

[0084] [Differentiation] The above embodiment can be modified as appropriate, as shown in the following modifications. Each modification may be applied in combination with other modifications, provided that no inconsistencies arise.

[0085] In this embodiment, the material used for the block 23 in the radiation shielding door can be concrete, polyethylene, mortar, palladium, or the like. Furthermore, the shape of the block 23 can be other than a rectangular prism. It is also possible to construct a single block 23 by combining multiple types of materials.

[0086] In a radiation shielding door, it is also possible to configure it so that multiple insertion parts are not formed within the internal space of the door body 2. That is, it is also acceptable to configure it so that blocks 23, 23, ... are stacked vertically within a single internal space, thereby inserting the blocks 23, 23, ... into the interior of the door body 2.

[0087] In a radiation shielding door, it is also possible to omit the cover member 22 that shields the opening surface of the door body 2. Furthermore, it is also possible to provide the opening surface on another surface of the door body 2 (for example, the top surface or rear surface).

[0088] In a radiation shielding door, it is also possible to omit the handle 24 from the block 23. Furthermore, it is possible to adopt configurations such as making the handle 24 of the block 23 non-removable, making the handle 24 of the block 23 removable by means other than screws, or providing a recess in the block 23 to serve as the handle 24. [Explanation of Symbols]

[0089] 1. Heavy-duty door (radiation shielding door) 2. Door body 3. Hinge 4. Door frame (end frame) 5. Door frame (end frame) 6. Upper frame (door frame) 7. Lower frame (door frame) 8 Handles 9 Handles 21 Door body 21a Block guide 21c Protruding part 22 Cover member 23 Block 23a Female thread section 24 Handle 25 Door insertion part 25a Rail 31 Fixed hinge 32 Movable hinge 33 Pivot axis 34 Hinge-side support portion 34a Restricting piece 34b Spring support part 35 Door side support part 35a Compression section 36 Guide member 36a Fixed guide 36b Movable guide 37 Guide holder 38 Hinge spring 41 Shaft member 42 Shaft holding part 43 Pinion gear 44a Upper rack (rack) 44b Lower rack (rack) 45a First connecting member (connecting member) 45b Second connecting member (connecting member) 45c First guided part 45d Second guided part 45e First roller 45f Second roller 46 Rack Guide 46a Rack Roller 47 Connecting guide 47a Connecting roller 48 Support Member 50 rods 50a inclined surface 51 Rod guide 52 Pin support 53 Pressure pin 60 Handle restrictor 61 Restricting member 61a Rotating shaft 61b Slotted hole 62 Regulating protrusion 63 Regulated part 64 Pin retaining part 65 Release pin 65a Tip 65b Engagement rod 70 Door regulating section 71 Shaft section 72 Regulating member 73 Regulating roller 74 Cushioning member 74a Main body 74b Contact part 74c Compression spring C1 First side C2 Second side O1 First virtual center O2 Second virtual center R1 First radius of curvature R2 Second radius of curvature P packing W wall Wa opening F reaction force α angle

Claims

1. A radiation shielding door comprising a door frame provided in an opening formed in a wall, and a door body that allows the opening to be opened and closed, The door body has an opening surface that communicates with the internal space of the door body. Multiple blocks are inserted vertically into the aforementioned internal space. The aforementioned block is a radiation shielding door that has a radiation shielding function and can be inserted through the opening.

2. Multiple insertion parts, divided vertically, are formed in the aforementioned internal space. The radiation shielding door according to claim 1, wherein each of the insertion portions is such that the block can be inserted from the opening surface.

3. An engaging portion is formed on the upper surface of the aforementioned block to engage with another block above it. The radiation shielding door according to claim 2, wherein an engaging portion is formed on the lower surface of the block, into which another block below engages.

4. The radiation shielding door according to claim 3, wherein the door body is provided with a cover member that shields the opening surface.

5. The door body is rotatably mounted to the door frame via a hinge, The radiation shielding door according to claim 4, wherein the opening surface is formed on the door-side of the door body.

6. Each of the blocks is provided with a handle on the side of the opening, as described in claim 5.

7. The radiation shielding door according to claim 6, wherein the handle is detachable from the block.

8. The block has a female threaded portion, and the handle has a male threaded portion. The radiation shielding door according to claim 7, wherein the handle is assembled to the block by screwing the male threaded portion and the female threaded portion together.

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