door

Abstract

To provide a door that can ensure airtightness when closing the opening. [Solution] The door comprises a frame provided on the periphery of the opening, having a first vertical frame, a second vertical frame, and an upper horizontal frame, but no lower horizontal frame; a door body rotatably attached to the first vertical frame via a hinge, which opens and closes the opening as it rotates; a door stop provided along the frame; a packing provided along the front surface of the door stop, which the edge of the door body abuts against when the door body is in the closed position; and a tight member provided at the bottom of the door body. The tight member comprises a case provided near the bottom of the door body and a lifting member that can move up and down relative to the case. The lifting member is housed in the case when the door body is in a position other than the closed position, and when the door body is in the closed position, it protrudes downward from the case to close the space between the bottom of the door body and the floor. The width of the specific space between the outer surface of the lifting member and the inner surface of the case is 0.5 mm or less.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a door.

Background Art

[0002] Patent Document 1 discloses a door having a door frame including a left vertical frame and a right vertical frame spaced apart in the left - right direction, an upper horizontal frame and a lower horizontal frame connecting between the upper ends and the lower ends thereof respectively, a door panel attached to one vertical frame of the door frame via a hinge, a door stop provided along the left vertical frame, the right vertical frame and the upper horizontal frame of the door frame, and a magnetic packing attached to the door stop.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As part of barrier - free measures, it may be considered to omit the lower horizontal frame of the frame body to eliminate the step with the floor surface. In that case, there is a possibility that the airtightness when the door panel is closed cannot be sufficiently ensured.

[0005] This specification provides a door that can achieve barrier - free correspondence and can sufficiently ensure the airtightness when closing an opening.

Means for Solving the Problems

[0006] The door disclosed herein comprises a frame provided on the periphery of an opening, having a first vertical frame, a second vertical frame spaced apart from the first vertical frame in the left-right direction, and an upper horizontal frame connecting the upper ends of the first vertical frame and the second vertical frame, but without a horizontal frame connecting the lower ends of the first vertical frame and the second vertical frame; a door body rotatably attached to the first vertical frame via a hinge, opening and closing the opening by rotation; a door stop provided along the frame, with the edge of one side of the door body in the closed position facing it; a packing provided along the front surface of the door stop, with the edge of the door body in contact when the door body is in the closed position; and a tight member provided at the lower part of the door body. The tight member has a case provided near the lower part of the door body and a lifting member that can move up and down relative to the case. The lifting member is housed within the case when the door body is in a position other than the closed position, and protrudes downward from the case to close the space between the lower part of the door body and the floor when the door body is in the closed position. The width of the specific space between the outer surface of the lifting member and the inner surface of the case is 0.5 mm or less.

[0007] In the above door, the frame does not have a horizontal frame connecting the lower ends of the first and second vertical frames. Therefore, there is no step between the frame and the floor. This door makes it possible to achieve barrier-free design. In addition, in this door, when the door body is in the closed position, the lifting member of the tight member protrudes downward, closing the space between the bottom of the door body and the floor. Furthermore, the width of the specific space between the outer surface of the lifting member and the inner surface of the case is 0.5 mm or less. Therefore, it is possible to effectively suppress sound leakage through the gap (specific space) between the outer surface of the lifting member and the inner surface of the case when it is lowered. This door can meet advanced sound insulation performance standards such as DR30. Accordingly, this door makes it possible to achieve barrier-free design and also ensures sufficient airtightness when closing the opening.

[0008] A blocking material may be attached to at least one of the outer surface of the lifting member and the inner surface of the case. The specific space may be the space between the outer surface of the lifting member, including the attached blocking material, and the inner surface of the case.

[0009] With this configuration, by providing a sealing material on at least one of the outer surface of the lifting member and the inner surface of the case, the width of a specific space can be appropriately adjusted to 0.5 mm or less. For example, even if the tight member is an existing product in which the gap between the outer surface of the lifting member and the inner surface of the case is formed to be larger than 0.5 mm, the width of a specific space can be appropriately adjusted to 0.5 mm or less by attaching a sealing material. For example, it can meet advanced sound insulation performance standards such as DR30.

[0010] When the door body is in the closed position, a portion of the front surface of the case and the packing may be in close contact.

[0011] Here, "a portion of the front surface of the case and the gasket being in close contact" is not limited to direct contact between a portion of the front surface of the case and the gasket, but may also include contact between a portion of the front surface of the case and the gasket via a covering material (e.g., a metal plate) placed on the surface of the case. With this configuration, the case and the gasket are in close contact when the door body is in the closed position. Consequently, the gap between the lifting member and the gasket when in the closed position can also be reduced. This ensures a more appropriate airtight seal when closing the opening.

[0012] A cushioning member may be provided on the front surface near the lower part of the packing. The cushioning member may face the lifting member that protrudes from the case when the door body is in the closed position.

[0013] Here, "the cushioning member facing the lifting member" is not limited to the cushioning member facing the lifting member with a gap between them, but may also include the cushioning member being in close contact with the lifting member. With this configuration, when the door body is in the closed position, the lifting member protruding from the case and the cushioning member face each other. The gap between the lifting member protruding from the case and the front surface near the bottom of the packing can be reduced. This ensures a more appropriate airtight seal when closing the opening. [Brief explanation of the drawing]

[0014] [Figure 1] A front view showing door 2 of the first embodiment. [Figure 2] A front view of door 2 in Figure 1, with the door body 20 removed. [Figure 3] A cross-sectional diagram showing the section between III-III in Figure 1. [Figure 4] A cross-sectional diagram showing the section between IV-IV in Figure 1. [Figure 5] (a) is an enlarged explanatory diagram of the Va portion of Figure 3, and (b) is an enlarged explanatory diagram of the Vb portion of Figure 4. [Figure 6] A cross-sectional diagram showing the area around the first vertical portion 52 of the tight member 100 and the packing 50. [Figure 7] A graph showing the measurement results of the airborne sound insulation performance (sound transmission loss) of door 2 in the first embodiment. [Figure 8] A graph showing the measurement results of the airborne sound insulation performance (sound transmission loss) of the comparative example door. [Figure 9] A cross-sectional diagram showing a portion of the door 202 of the second embodiment. [Figure 10] A cross-sectional diagram showing a portion of the door 302 of the third embodiment. [Modes for carrying out the invention]

[0015] (First embodiment) FIG. 1 shows the door 2 of the first embodiment. FIG. 2 shows the state where the door body 20 is removed from the door 2 of FIG. 1. As shown in FIG. 1, the door 2 of this embodiment is a door having a structure capable of sealing the opening 4 which is an entrance / exit of a soundproof room or the like. As shown in FIGS. 1 and 2, the door 2 includes a frame body 10 provided at the periphery of the opening 4, a door body 20 for opening and closing the opening 4, a door stop 30 provided on the frame body 10, a packing 50 provided on the front surface of the door stop 30 and abutting against the back surface 20B of the door body 20 when closed, and a tight member 100 provided at the lower part of the door body 20 for closing the space 6 between the door body 20 when closed and the upper surface (floor surface) of the flooring material FL.

[0016] The frame body 10 is provided at the periphery of the opening 4. The frame body 10 is formed so as to surround the left, right, and upper sides of the periphery of the opening 4. The frame body 10 has a first vertical frame 12, a second vertical frame 14, and an upper horizontal frame 16. The first vertical frame 12 is a vertical frame provided at one periphery in the left-right direction of the opening 4. A hinge (not shown) for attaching the door body 20 is provided on the first vertical frame 12. The first vertical frame 12 may be called the hinge-side vertical frame. The second vertical frame 14 is another vertical frame arranged at an interval in the left-right direction of the first vertical frame 12. The second vertical frame 14 may be called the latch-side vertical frame. The upper horizontal frame 16 is a so-called lintel and is a horizontal frame provided at the upper periphery of the opening 4. The upper horizontal frame 16 connects the upper end portions between the first vertical frame 12 and the second vertical frame 14. Note that the frame body 10 of this embodiment does not have a horizontal frame (lower horizontal frame) connecting the lower end portions between the first vertical frame 12 and the second vertical frame 14. That is, the frame body 10 does not have a so-called threshold. For this reason, according to the door 2 of this embodiment, no step is generated between the floor surface (the upper surface of the flooring material FL). There is no step that becomes an obstacle to the passage of a wheelchair, a walker, a cart, etc. According to the door 2 of this embodiment, barrier-free correspondence can be realized. Also, in this embodiment, the lower end portions of the vertical frames 12 and 14 extend below the upper surface of the flooring material FL. In this embodiment, the flooring material FL may be laid after the installation of the frame body 10.

[0017] The door body 20 is rotatably attached to the first vertical frame 12 via a hinge. As the door body 20 rotates, the opening 4 is opened and closed. In the example of FIG. 1, the door body 20 is in the closed position closing the opening 4. A doorknob 25 is provided at a portion of the door body 20 near the latch. FIGS. 3 and 4 schematically show cross-sections between III-III and IV-IV of FIG. 1, respectively. The door body 20 in FIGS. 3 and 4 is also in the closed position. As shown in FIGS. 3 and 4, the door body 20 has a front surface 20F and a back surface 20B. The edge of the back surface 20B faces the doorstop 30 when the door body 20 is in the closed position. In the present embodiment, an elongated metal plate 70 is attached to a portion of the edge of the back surface 20B that faces the doorstop 30. The metal plate 70 is provided so as to be exposed from the back surface 20B. In other examples, the metal plate 70 may be built into the edge of the back surface 20B. In still other examples, a metal plate may be arranged on the entire back surface 20B, or a metal plate may be built into the entire back surface 20B.

[0018] The doorstop 30 is a member provided along the entire length of the frame body 10, and is a member against which the edge of the back surface 20B of the door body 20 in the closed position faces. The doorstop 30 is attached to the frame body 10 so as to project inside the frame body 10 (on the side of the opening 4). The front surface of the doorstop 30 faces the edge of the back surface 20B of the door body 20 in the closed position.

[0019] As shown in FIG. 2, the doorstop 30 has a first vertical member 32, a second vertical member 34, and an upper horizontal member 36. The first vertical member 32, the second vertical member 34, and the upper horizontal member 36 are provided along the first vertical frame 12, the second vertical frame 14, and the upper horizontal frame 16 of the frame body 10, respectively. The upper horizontal member 36 connects between the upper end portions of the first vertical member 32 and the second vertical member 34. The lower end portions of the vertical members 32 and 34 extend below the upper surface of the flooring material FL. In other examples, the lower end portions of the vertical members 32 and 34 may extend to the same height as the upper surface of the flooring material FL. [[ID=**10**]]

[0020] [[ID=**11**]] The packing 50 is a cushioning member provided around the entire circumference of the front surface of the door stop 30. The body of the packing 50 is made of an elastic material, such as rubber or resin, that can be deformed in response to pressure and can be restored to its original shape when the pressure is released. Figures 5(a) and 5(b) show enlarged views of parts Va in Figure 3 and Vb in Figure 4, respectively. As shown in Figures 5(a) and 5(b), the packing 50 is fixed to each part of the door stop 30 by fitting a projection provided on the rear side into grooves provided on the front surface of each part of the door stop 30. In this embodiment, the packing 50 is a magnetic packing with an elongated magnet 51 built into its body. When the door body 20 is in the closed position, the metal plate 70 is attracted to the magnet 51 of the packing 50. The magnetic force of the magnet 51 allows the packing 50 and the door body 20 to be brought into close contact.

[0021] As shown in Figures 2 to 5, the packing 50 has a first vertical portion 52, a second vertical portion 54, and an upper horizontal portion 56. The first vertical portion 52, the second vertical portion 54, and the upper horizontal portion 56 are provided on the front surfaces of the first vertical member 32, the second vertical member 34, and the upper horizontal member 36 of the door stop 30, respectively. Each portion 52, 56, and 54 is formed integrally to form a single continuous packing 50. In other examples, each portion 52, 56, and 54 may be formed separately.

[0022] As shown in Figures 3 to 5, when the door body 20 is in the closed position, the front surface of the packing 50 is in close contact with the edge of the door body 20. As described above, the magnetic force of the magnet 51 causes the packing 50 and the door body 20 to be in close contact. This seals the upper edge and left and right edges of the opening 4.

[0023] As shown in Figures 1 to 3, the tight member 100 is provided at the bottom of the door body 20. Figure 6 shows the area around the tight member 100 and the first vertical portion 52 of the packing 50 when the door body 20 is in the closed position. As shown in Figures 3 and 6, in this embodiment, the tight member 100 is provided at a position in the lower part of the door body 20 that is exposed from the back surface 20B. That is, in this embodiment, the tight member 100 is provided at a position visible from the back surface 20B side of the door body 20. In this embodiment, the tight member 100 is installed in a space cut out from the lower part of the back surface 20B of the door body 20.

[0024] As shown in Figure 6, the tight member 100 comprises a case 110, a lifting member 120, and a locking member 130. The case 110 is located near the bottom of the rear side 20B of the door body 20. The lifting member 120 and the locking member 130 are housed inside the case 110. The case 110 is the housing of the tight member 100 and is made of, for example, metal. The lifting member 120 is provided to move up and down relative to the case 110. When the door body 20 is in a position other than the closed position (open position), the lifting member 120 is housed inside the case 110 (see dashed line in the figure). The lifting member 120 housed inside the case 110 is locked by the locking member 130 and held inside the case 110. On the other hand, when the door body 20 is in the closed position, the lifting member 120 protrudes downward from the case 110 to close the space 6 between the lower part of the door body 20 and the upper surface (floor surface) of the flooring material FL (see the solid line portion in the figure). Any known lifting mechanism may be used as the lifting mechanism for performing this lifting and lowering operation of the lifting member 120. For example, a trigger member may be provided on the case 110, and when the door body 20 is not in the closed position, the trigger member will not be pressed and will protrude out of the case 110, thereby housing the lifting member 120 inside the case 110. When the door body 20 moves to the closed position, the trigger member will hit a door stop or the like and be pushed back into the case 110, thereby lowering the lifting member 120. The lower end portion 122 of the lifting member 120 that contacts the floor surface when it protrudes may be made of an elastic material such as rubber or resin that can be deformed in response to pressure and can be restored to its original shape when the pressure is released. When the door body 20 is in the closed position, the lower end portion 122 of the lifting member 120 is in close contact with the floor surface. This seals the lower edge of the opening 4.

[0025] The outer surface of the lifting member 120 and the inner surface of the case 110 are not in contact. Therefore, a space (hereinafter referred to as a specific space S) exists between the outer surface of the lifting member 120 and the inner surface of the case 110. As shown in Figure 6, the specific space S includes a front space S1 and a rear space S2. The front space S1 is the space between the front surface of the lifting member 120 and the front inner surface of the case 110. The rear space S2 is the space between the rear surface of the lifting member 120 and the rear inner surface of the case 110. Hereinafter, when the front space S1 and the rear space S2 are not distinguished, they will simply be referred to as "the specific space S". In this embodiment, the width W of the specific space S is 0.5 mm or less. The width W of the specific space S may also be defined as the distance between the outer surface of the lifting member 120 and the inner surface of the case 110. The width W also includes the width W1 of space S1 and the width W2 of space S2. Both width W1 and width W2 are 0.5 mm or less. Hereinafter, when widths W1 and W2 are not distinguished, they will simply be referred to as "width W". In this embodiment, since the width W of the specific space S between the outer surface of the lifting member 120 and the inner surface of the case 110 is 0.5 mm or less, sound leakage through the gap (specific space S) between the outer surface of the lifting member 120 and the inner surface of the case 110 when it is lowered can be effectively suppressed. Therefore, according to the door 2 of this embodiment, it is possible to meet advanced sound insulation performance standards such as DR30.

[0026] As shown in Figure 6, in this embodiment, when the door body 20 is in the closed position, a portion of the front surface of the case 110 and the packing 50 are in close contact. Specifically, the case 110 and a portion of the first vertical portion 52 and a portion of the second vertical portion 54 of the packing 50 are in close contact. In this embodiment, a portion of the surface of the case 110 is also covered with the metal plate 70. Therefore, to be more precise, when the door body 20 is in the closed position, the case 110 and a portion of the first vertical portion 52 and a portion of the second vertical portion 54 of the packing 50 are in close contact via the metal plate 70. Consequently, the gap between the lifting member 120 and the packing 50 when in the closed position can also be reduced. This ensures a more appropriate airtight seal when closing the opening 4.

[0027] Furthermore, a buffer member 60 is provided on the front surface near the lower end of the first vertical portion 52 of the packing 50. Similarly, a buffer member 60 is also provided on the front surface near the lower end of the second vertical portion 54 of the packing 50 (see Figure 2). The buffer member 60 is made of, for example, EPDM (ethylene propylene rubber), rubber sponge, or other resin material. Due to the presence of the buffer member 60, the thickness of the lower end portions of the first vertical portion 52 and the second vertical portion 54 of the packing 50 becomes greater than the thickness of other portions. The buffer member 60 faces the outer surface of the lifting member 120 that protrudes from the case 110 when the door body 20 is in the closed position. In this case, the buffer member 60 may be in close contact with the lifting member 120. By providing the buffer member 60, the gap between the lifting member 120 protruding from the case 110 and the front surface near the lower part of the packing 50 can be reduced. This ensures a more appropriate airtight seal when closing the opening 4.

[0028] To properly explain the advantages of door 2 in this embodiment, the configuration of the comparative example door will be described. The comparative example door has almost the same configuration as door 2 in this embodiment, but differs from this embodiment in that the tight member is a conventional product. In the comparative example's tight member, the width of the specific space between the outer surface of the lifting member and the inner surface of the case is 1.0 mm, which is wider than the width W (0.5 mm) of the specific space S in this embodiment. Based on this fact, the results of a test measuring the air sound insulation performance using door 2 in this embodiment and the comparative example door will be explained with reference to Figures 7 and 8. Figure 7 shows the test results for door 2 in this embodiment (width W of specific space S is 0.5 mm). Figure 8 shows the test results for the comparative example door (width of specific space is 1.0 mm). In the graphs in Figures 7 and 8, the horizontal axis shows the center frequency of the incident sound (unit: Hz), and the vertical axis shows the sound transmission loss (unit: dB).

[0029] As shown in Figure 8, the comparative example door achieves a sound transmission loss that meets the DR30 standard (one of the sound insulation performance standards) in the low-frequency range of 125Hz to 1000Hz, but in the mid-to-high frequency range of 1000Hz and above, it achieves a sound transmission loss that falls below the DR30 standard. The comparative example door cannot meet the DR30 sound insulation performance standard. In other words, the comparative example door cannot exhibit high sound insulation performance.

[0030] In contrast, as shown in Figure 7, door 2 of this embodiment achieves sound transmission loss that nearly meets the DR30 standard value even in the mid-to-high frequency range above 1000 Hz. In the graph of Figure 7, the portion that falls slightly below the DR30 standard value is within the acceptable margin of error. In other words, door 2 of this embodiment meets the DR30 sound insulation performance standard in all frequency ranges. Door 2 of this embodiment can meet advanced sound insulation performance standards such as DR30. Door 2 of this embodiment can exhibit higher sound insulation performance than conventional doors.

[0031] The configuration of door 2 in this embodiment has been described above. As described above, in door 2 in this embodiment, the frame 10 does not have a lower horizontal frame (sill). Therefore, there is no step between it and the floor surface. Door 2 in this embodiment makes it possible to achieve barrier-free access. In addition, in door 2 in this embodiment, when the door body 20 is in the closed position, the lifting member 120 of the tight member 100 protrudes downward to close the space between the lower part of the door body 20 and the floor. Furthermore, the width W of the specific space S between the outer surface of the lifting member 120 and the inner surface of the case 110 is 0.5 mm or less. Therefore, it is possible to effectively suppress sound leakage through the gap (specific space S) between the outer surface of the lifting member 120 and the inner surface of the case 110 when it is lowered. Door 2 in this embodiment can meet advanced sound insulation performance standards such as DR30 (see Figure 7). Accordingly, door 2 in this embodiment makes it possible to achieve barrier-free access, and also ensures sufficient airtightness when closing the opening 4.

[0032] In this embodiment, when the door body 20 is in the closed position, the case 110 and a portion of the first vertical portion 52 and a portion of the second vertical portion 54 of the packing 50 are in close contact via the metal plate 70 (see Figure 6). Consequently, the gap between the lifting member 120 and the packing 50 when in the closed position can also be reduced. This ensures a more appropriate airtight seal when closing the opening 4.

[0033] In this embodiment, cushioning members 60 are provided on the front surface near the lower end of the first vertical portion 52 of the packing 50 and on the front surface near the lower end of the second vertical portion 54 of the packing 50. The cushioning members 60 face the outer surface of the lifting member 120 that protrudes from the case 110 when the door body 20 is in the closed position (see Figure 6). By providing the cushioning members 60, the gap between the lifting member 120 that protrudes from the case 110 and the front surface near the lower part of the packing 50 can be reduced. This ensures a more appropriate airtight seal when closing the opening 4.

[0034] (Second example) Referring to Figure 9, the differences between the door 202 of the second embodiment and the first embodiment will be explained. In this embodiment, as shown in Figure 9, a closing material 112 is attached to the inner surface of the case 110, which is different from the first embodiment. In this embodiment, the specific space S is the space between the inner surface of the case 110, including the attached closing material 112, and the outer surface of the lifting member 120. In this embodiment as well, the width W of the specific space S is 0.5 mm or less. The closing material 112 is a tape-shaped (or foil-shaped) member such as resin tape, paper tape, or metal foil.

[0035] According to the door 202 of this embodiment, by providing a sealing material 112 on the inner surface of the case 110, the width W of a specific space S can be appropriately adjusted to 0.5 mm or less. For example, even if the tight member 100 is an existing product in which the gap between the outer surface of the lifting member 120 and the inner surface of the case 110 is originally formed to be larger than 0.5 mm, the width W of a specific space S can be appropriately adjusted to 0.5 mm or less by attaching the sealing material 112. Even when using an existing product as the tight member 100, it is possible to meet advanced sound insulation performance standards such as DR30.

[0036] In the example shown in Figure 9, the width W of a specific space S is adjusted to 0.5 mm or less by providing a sealing material 112 on the inner surface of the case 110. However, this is not limited to this, and in a modified example, the width W of a specific space S may be adjusted to 0.5 mm or less by providing a sealing material on the outer surface of the lifting member 120. In yet another example, the width W of a specific space S may be adjusted to 0.5 mm or less by providing sealing materials on both the inner surface of the case 110 and the outer surface of the lifting member 120. Generally speaking, it is sufficient that a sealing material is attached to at least one of the outer surface of the lifting member and the inner surface of the case, and that the width of the specific space, which is the space between the outer surface of the lifting member including the sealing material and the inner surface of the case, is 0.5 mm or less.

[0037] (Third embodiment) Referring to Figure 10, the differences between the door 302 of the third embodiment and the first embodiment will be explained. As shown in Figure 10, in this embodiment as well, the tight member 100 is provided at the bottom of the door body 20. However, in this embodiment, the case 110 of the tight member 100 is provided in a position that is not exposed from the back surface 20B of the door body 20, which is different from the first embodiment. In this embodiment, the case 110 of the tight member 100 is provided near the center in the thickness direction of the door body 20. The case 110 of the tight member 100 is not exposed from either the front surface 20B or the back surface 20B of the door body 20. In other examples, the case 110 of the tight member 100 may be provided slightly closer to the back surface 20B or slightly closer to the front surface 20F in the thickness direction of the door body 20. Even in that case, the case 110 is not exposed from either the back surface 20B or the front surface 20F.

[0038] As shown in Figure 10, in this embodiment, the thickness of the cushioning member 60 is greater than that of the cushioning member 60 in the first embodiment. That is, the front surface of the cushioning member 60 in this embodiment protrudes further forward than the front surface of the cushioning member 60 in the first embodiment. In this embodiment as well, the cushioning member 60 faces the outer surface of the lifting member 120 that protrudes from the case 110 when the door body 20 is in the closed position. In this embodiment as well, the cushioning member 60 may be in close contact with the lifting member 120.

[0039] In this embodiment, the door 302 does not expose the case 110 of the tight member 100 from the back surface 20B of the door body 20. Therefore, the appearance of the door body 20 is improved. A visually appealing door 302 can be realized.

[0040] Although embodiments of the technology disclosed herein have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. For example, the following modifications may be included.

[0041] (Modification 1) The cushioning member 60 may be omitted. In that case, the appearance of the packing 50 will be improved.

[0042] (Modification 2) The packing 50 does not have to be a magnetic packing. The packing 50 does not have to have a magnet 51 built in. In that case, the metal plate 70 of the door body 20 may also be omitted.

[0043] Furthermore, the technical elements described herein or in the drawings demonstrate technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated herein or in the drawings achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness in itself. [Explanation of Symbols]

[0044] 2, 202, 302: Door 4: Opening 6: Space 10:Frame body 12: First vertical frame 14: Second vertical frame 16: Upper horizontal frame 20: Door body 20B: Back 20F:Front 30: Per door 50: Packing 51: Magnet 60: Cushioning material 70: Metal plate 100: Tightening component 110: Case 112: Occlusion material 120: Lifting member 122: Lower end part 130: Locking member FL: Flooring material S: Specific space W: Width of a specific space

Claims

1. A frame body provided around the periphery of an opening, comprising a first vertical frame, a second vertical frame spaced apart from the first vertical frame in the left-right direction, and an upper horizontal frame connecting the upper ends of the first vertical frame and the second vertical frame, but without a horizontal frame connecting the lower ends of the first vertical frame and the second vertical frame, A door body is rotatably mounted to the first vertical frame via a hinge, and opens and closes the opening as it rotates; A door stop is provided along the frame, and the edge of one side of the door body in the closed position faces the door stop, A packing provided along the front surface of the door stop, which the edge of the door body abuts against when the door body is in the closed position, The door body is provided with a tight member at the lower part, The aforementioned tightening member has a case provided near the lower part of the door body and a lifting member that can move up and down relative to the case. The lifting member is housed within the case when the door body is in a position other than the closed position, and when the door body is in the closed position, it protrudes downward from the case to close the space between the lower part of the door body and the floor. The width of the specific space between the outer surface of the lifting member and the inner surface of the case is 0.5 mm or less. door.

2. A sealing material is attached to at least one of the outer surface of the lifting member and the inner surface of the case. The door according to claim 1, wherein the specific space is the space between the outer surface of the lifting member, which includes the attached closing member, and the inner surface of the case.

3. The door according to claim 1, wherein when the door body is in the closed position, a portion of the front surface of the case and the packing are in close contact.

4. A cushioning member is further provided on the front surface near the lower part of the packing. The door according to claim 1, wherein the buffer member faces the lifting member that protrudes from the case when the door body is in the closed position.

Images