Waterproof door structure

Abstract

To achieve sufficient waterproof performance while having a simple and low-cost structure.SOLUTION: A packing 30 of a waterproof door structure is formed by stacking a first elastic member 32a having a rectangular cross section and fixed to the left side portion 12 of the door frame, and a second elastic member 32b having a rectangular cross section and in contact with a front face of a waterproof door body 20 in the closed state. The thickness of the first elastic member 32a is set to be larger than the thickness of the second elastic member 32b. The hardness of the second elastic member 32b is lower than the hardness of the first elastic member 32a. The second elastic member 32b is disposed so as to be accommodated inside the end portion 20a of the waterproof door main body 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a waterproof door structure that prevents water from entering. [Background technology]

[0002] For example, Patent Document 1 discloses a waterproof door for preventing water from entering a facility in the event of flooding, such as heavy rain or a tsunami. The waterproof door of Patent Document 1 includes a door frame provided at an entrance and a door body attached to the door frame so as to be freely opened and closed, and a peripheral elastic part is fixed to the peripheral edge of the door body. The peripheral elastic part is formed of a P-type packing. The P-type packing has a first elastic part and a second elastic part fixed to the first elastic part via an attachment plate. The first elastic part has a P-shaped cross section with a hollow part, and has a laminated structure in which a surface part is laminated on the outer surface of the hollow part. The second elastic part has a laminated structure in which a thin flat-plate-shaped member and a thick flat-plate-shaped member are laminated together.

[0003] Furthermore, Patent Document 2 discloses a door structure for a liquid storage chamber, and a P-type packing with a P-shaped cross section is fixed to the door of this structure as well, as shown in Figure 4 of Patent Document 2. A watertight seal soft packing is laminated on the outer surface of the hollow part of this P-type packing, and two packing backing plates are provided on the flat part of the P-type packing.

[0004] Furthermore, FIG. 6 of Patent Document 2 shows a waterproof structure in which a watertight seal hard packing and a watertight seal soft packing are laminated on a packing backing plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5977320 [Patent Document 2] Japanese Patent Application Publication No. 11-173024 Summary of the Invention [Problem to be solved by the invention]

[0006] However, since the water pressure acting on a waterproof door from the outside during heavy rain, for example, can be quite large, a waterproof structure is desired that will prevent water from entering the facility even when such large water pressure acts. On the other hand, there is a demand for the waterproof structure to be as simple as possible, taking into consideration factors such as manufacturing costs and ease of maintenance.

[0007] In this regard, the P-type packing of Patent Document 1 has a laminated structure for the hollow portion of the first elastic portion and a laminated structure for the flat portion of the second elastic portion, and the first elastic portion and the second elastic portion are integrated via an attachment plate, which increases the number of parts and assembly steps, not only raising manufacturing costs but also making maintenance difficult.In addition, the P-type packing has a complex shape with a hollow portion, which also raises manufacturing costs.

[0008] The configuration shown in Figure 4 of Patent Document 2 is also a P-type packing with a complex shape that has a hollow portion, and the outer surface of the hollow portion has a laminated structure, and the flat portion also has a laminated structure with a packing backing plate, so like the configuration of Patent Document 1, the manufacturing cost increases and there is room for improvement in maintainability.

[0009] In addition, in the configuration shown in Figure 6 of Patent Document 2, the absence of a hollow portion simplifies the shape, which is thought to reduce manufacturing costs. However, when water pressure is applied (Figure 8 of Patent Document 2), the hard watertight seal packing and the soft watertight seal packing separate, and the two do not work together to improve waterproof performance, which may allow water to enter.

[0010] There are concerns about water intrusion under high water pressure even with the P-type packing in Patent Document 1. That is, in the case of a P-type packing, the part that comes into contact with the door stop is curved, so the contact area with the door stop is small, making it easy for water leaks to form under high water pressure. Furthermore, because the hollow part of the P-type packing is easily deformed, it may deform under high water pressure, resulting in the risk of water leaks.

[0011] The P-type packing of Patent Document 2 has a shape that allows for surface contact, but the hollow portion of the P-type packing is prone to deformation, just like the packing of Patent Document 1, and similar problems can occur.

[0012] The present disclosure has been made in consideration of the above points, and its object is to provide a structure that is simple and allows for low cost while still providing sufficient waterproof performance. [Means for solving the problem]

[0013] In order to achieve the above-mentioned object, one aspect of the present disclosure can be based on a waterproof door structure comprising a door frame fixed to a structure, a waterproof door body rotatably supported on the door frame via a hinge, and a gasket interposed between the door frame and one side of the waterproof door body and continuous in the circumferential direction of the waterproof door body, which prevents water from entering from the side where the other side of the waterproof door body is located.

[0014] The packing is formed by laminating a first elastic member having a rectangular cross section fixed to a portion of the door frame facing one surface of the waterproof door main body, and a second elastic member having a rectangular cross section fixed to a surface of the first elastic member opposite the door frame and in contact with one surface of the waterproof door main body in the closed state. The thickness of the first elastic member is set to be thicker than that of the second elastic member. The hardness of the second elastic member is set to be softer than that of the first elastic member. The second elastic member is arranged so as to be located inside one surface of the waterproof door main body relative to the edge of the one surface.

[0015] According to this configuration, the first elastic member and the second elastic member that make up the packing both have a rectangular cross section and a simple shape, so the packing is less expensive than a conventional P-type packing. Also, because the first elastic member and the second elastic member are simply laminated, the packing is less expensive than a conventional packing that has a laminated structure in multiple places.

[0016] When the waterproof door body is closed, the second elastic member of the packing comes into contact with one side of the waterproof door body. When water pressure acts on the other side of the waterproof door body in the closed state, outside water enters between the door frame and the waterproof door body from the edge of the waterproof door body. At this time, because the second elastic member is softer than the first elastic member, the second elastic member easily elastically deforms to fit along one side of the waterproof door body, forming a tight seal, eliminating any gap, i.e., a water gap, between the second elastic member and one side of the waterproof door body. At low water pressure, sufficient waterproofing performance can be achieved with just the elastic deformation of the second elastic member.

[0017] When the water pressure is high, the waterproof door body is displaced by the water pressure, and one side of the waterproof door body presses hard against the packing. That is, when the packing is pressed hard by the waterproof door body, both the first elastic member and the second elastic member are elastically deformed, and at this time, because the second elastic member is thin and soft, the second elastic member is crushed and embedded in the first elastic member.

[0018] This second elastic member is arranged so as to be contained inside one surface of the waterproof door main body relative to the edge of that surface, making it difficult for water to get in between the second elastic member and one surface of the waterproof door main body. Also, the second elastic member embedded in the first elastic member is not directly subjected to high water pressure, and it is the first elastic member, which is relatively hard and does not easily deform even under high water pressure, that directly receives high water pressure, making it difficult for a water conduit to form between it and the waterproof door main body. Also, because the packing is made up of the first elastic member and the second elastic member, each with a rectangular cross section, it does not have a narrow contact area due to a curved surface like the P-type packing of the conventional example, but rather has a wide surface contact with one surface of the waterproof door main body, which also makes it difficult for a water conduit to form between it and the waterproof door main body.

[0019] A groove into which the door frame-side portion of the first elastic member fits may be provided in a portion of the door frame facing one surface of the waterproof door main body. In this case, the first elastic member can be formed so as to protrude from the groove in an uncompressed state. With this configuration, when attaching the packing to the door frame, the first elastic member is fitted into the groove and, if necessary, the first elastic member is adhered to the inner surface of the groove, simplifying the packing installation work. Furthermore, when removing the packing for maintenance or the like, the packing can be removed simply by pulling it out of the groove, simplifying the packing removal work.

[0020] The waterproof door structure may include a biasing force generator that biases the waterproof door main body in a closing direction. In this case, the hardness of the second elastic member can be set so that it elastically deforms when pressed by one surface of the waterproof door main body to which the biasing force of the biasing force generator acts. With this configuration, the second elastic member can be kept in close contact with one surface of the waterproof door main body by utilizing the biasing force of a biasing force generator such as a door closer, an auto hinge (hinge closer), a cremone handle, or a latch.

[0021] The thickness of the second elastic member provided at the lower edge of the door frame may be set to be thicker than the second elastic member provided at the upper edge of the door frame. In other words, the lower edge of the door frame is a place where water is more likely to penetrate than the upper edge, and by making the second elastic member provided at this place where water is more likely to penetrate relatively thick, it becomes less likely that a water leak will form between the second elastic member and one side of the waterproof door body.

[0022] The second elastic member provided at the bottom edge of the door frame may be continuous from one side edge to the other side edge of the door frame. That is, since the waterproof door main body is structured to rotate by a hinge, when the waterproof door main body is opened, the hinge side portion of the waterproof door main body moves so as to rub against the second elastic member as the door is opened. In this case, if the waterproof door main body rubs against the edge of the second elastic member, there is a risk that the second elastic member will peel off from the edge. However, in this configuration, since the second elastic member is continuous from one side edge to the other side edge of the door frame, the waterproof door main body will not rub against the edge of the second elastic member, and peeling of the second elastic member from the edge can be suppressed and sufficient waterproof performance can be obtained. [Effects of the Invention]

[0023] As described above, the gasket is formed by stacking a first elastic member and a second elastic member, each having a rectangular cross section, with the first elastic member being relatively thick and the second elastic member being relatively soft, and the second elastic member being positioned so that it is located inside the edge of the waterproof door body, thereby achieving sufficient waterproof performance while maintaining a simple and low-cost structure. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view of a waterproof door structure according to a first embodiment of the present invention. [Figure 2] 1 is a front view of a waterproof door structure according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. [Figure 7] This is a diagram equivalent to Figure 3 when low water pressure is applied. [Figure 8] This is a diagram equivalent to Figure 3 when high water pressure is applied. [Figure 9] FIG. 4 is an enlarged view of a lower portion of the packing. [Figure 10] 10 is a diagram illustrating the positional relationship between the second elastic member at the lower part of the packing and the waterproof door main body. FIG. [Figure 11] FIG. 10 is a perspective view of a waterproof door structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0026] FIG. 1 is a perspective view of a waterproof door structure 1 according to a first embodiment of the present invention. The waterproof door structure 1 is installed in a structure 100, such as a house, office, factory, or warehouse, to prevent water in a space outside the waterproof door structure 1 from infiltrating into a space inside the waterproof door structure 1. The structure 100 is not limited to the above-described example and may be, for example, a structure constituting an underground facility such as an underground shopping mall or subway, or a structure constituting a passageway or staircase. The spaces outside and inside the waterproof door structure 1 may be passageways or staircases, respectively. The space outside the waterproof door structure 1 may be a space outside the structure 100. In this case, the waterproof door structure 1 can be used to prevent water caused by flooding, such as heavy rain or a tsunami, from infiltrating into the space inside the structure 100. In other words, the waterproof door structure 1 can be installed to protect important equipment or areas from water intrusion.

[0027] In the description of this embodiment, the side on which water pressure acts will be referred to as the outside, and the side that prevents water from entering will be referred to as the inside. Furthermore, the side that is the left side when viewing the waterproof door structure 1 from the outside will be simply referred to as the left side, and the side that is the right side when viewing the waterproof door structure 1 from the outside will be simply referred to as the right side. These definitions of directions are provided solely for the convenience of description, and do not limit the directions when installed or used.

[0028] The waterproof door structure 1 comprises a door frame 10 fixed to a structure 100, a waterproof door body 20, and a gasket 30. The door frame 10 is rectangular and elongated in the vertical direction, and has an upper edge portion 11, a left edge portion 12, a lower edge portion 13, and a right edge portion 14. The upper edge portion 11 and the lower edge portion 13 extend in the left-right direction and are substantially parallel to each other. The left edge portion 12 and the right edge portion 14 extend in the vertical direction and are substantially parallel to each other. That is, the left edge portion 12 extends downward from the left end of the upper edge portion 11, and the left end of the lower edge portion 13 is connected to the lower end of the left edge portion 12. The right edge portion 14 extends downward from the right end of the upper edge portion 11, and the right end of the lower edge portion 13 is connected to the lower end of the right edge portion 14. The shape of the door frame 10 is not limited to the shape shown in the figure, and the ratio of the vertical dimension to the horizontal dimension (aspect ratio) of the door frame 10 can be set arbitrarily.

[0029] The waterproof door body 20 has an outer shape corresponding to the rectangular shape of the door frame 10, and is therefore a rectangle that is long in the vertical direction. When the waterproof door body 20 is in the closed state, the surface facing the inside is one surface, and the surface facing the outside is the other surface. One surface of the waterproof door body 20 is called the front surface, and the other surface of the waterproof door body 20 is called the back surface.

[0030] The right side of the waterproof door main body 20 is rotatably supported via a hinge 21 relative to the right side 14 of the door frame 10. A plurality of hinges 21 are provided at intervals in the vertical direction. The rotation axis of the hinge 21 extends in the vertical direction, and therefore the waterproof door main body 20 rotates around the axis extending in the vertical direction, and can be switched between an open state shown in Figures 1 and 2 and a closed state (shown in Figures 7 and 8). In the open state, the entire door frame 10 can be opened, and people can enter and exit through the inside of the door frame 10. On the other hand, in the closed state, the entire door frame 10 is completely closed.

[0031] A door latch 21a and a door lever 22 for operating the door latch 21a are provided on the opposite side of the hinge 21 of the waterproof door main body 20. When the waterproof door main body 20 is in the closed state, the door latch 21a is inserted into and locked in a locking hole (not shown) formed in the left side edge 12 of the door frame 10, and the waterproof door main body 20 does not rotate in the opening direction. When operating the waterproof door main body 20 in the opening direction, the door lever 22 is operated to set the door latch 21a in the unlocked state. An electric lock or an electronic lock can be attached to the waterproof door main body 20 as needed.

[0032] The waterproof door structure 1 also includes a door closer (an example of a biasing force generating device) 40. The door closer 40 is a device that generates a biasing force that biases the waterproof door main body 20 in the closing direction, and a conventionally known door closer can be used. That is, the door closer 40 includes a main body 41 that is fixed to the inner surface of the waterproof door main body 20, and an arm 42 that extends from the main body 41 and is rotatably connected to the upper edge 11 of the door frame 10. A spring or the like built into the main body 41 applies a rotational force to the arm 42 in the direction of closing the waterproof door main body 20. A general door closer 40 can be used instead of a device specifically for waterproof doors.

[0033] Although not shown, the waterproof door main body 20 may be supported on the left side 12 of the door frame 10, or on the upper side 11 or lower side 13. In this case, the installation position of the door closer 40 also changes. The door closer 40 may be fixed to the outer surface of the waterproof door main body 20, and instead of the door closer 40, a biasing force generating device such as an auto hinge (hinge closer), a cremone handle, or a latch may be used to generate a biasing force that biases the waterproof door main body 20 in the closing direction.

[0034] The packing 30 is interposed between the door frame 10 and the inner surface of the waterproof door main body 20, and is continuous in the circumferential direction of the waterproof door main body 20. This packing 30 is a member that seals the gap between the door frame 10 and the inner surface of the waterproof door main body 20 all around, and prevents water from entering from the side (outside) where the back surface of the waterproof door main body 20 is located.

[0035] The packing 30 is fixed to the door frame 10. Specifically, the packing 30 has an upper portion 31 extending laterally along the upper edge 11 of the door frame 10, a left portion 32 extending vertically along the left edge 12 of the door frame 10, a lower portion 33 extending laterally along the lower edge 13 of the door frame 10, and a right portion 34 extending vertically along the right edge 14 of the door frame 10. The upper portion 31 and the lower portion 33 are parallel to each other, and the left portion 32 and the right portion 34 are also parallel to each other. Specifically, the left portion 32 extends downward from the left end of the upper portion 31, and the left end of the lower portion 33 is connected to the lower end of the left portion 32. The right portion 34 extends downward from the right end of the upper portion 31, and the lower end of the right portion 34 is connected to the right end of the lower portion 33.

[0036] As shown in FIG. 3, the left side edge 12 of the door frame 10 has a base plate 12a extending in the left-right direction and a vertical plate 12b protruding outward from the left end of the base plate 12a. The base plate 12a is the portion of the door frame 10 that faces the surface of the waterproof door main body 20. A holder 12c is provided on the outer surface (exterior) of the base plate 12a to which the left side 32 of the packing 30 is attached. The holder 12c has a fixed plate 12d fixed to the outer surface of the base plate 12a, a left side plate 12e protruding outward from the left end of the fixed plate 12d, and a right side plate 12f protruding outward from the right end of the fixed plate 12d. Inside the holder 12c, a groove 12g is formed by the fixed plate 12d, the left side plate 12e, and the right side plate 12f, opening outward. The groove 12g is a groove into which the left side 32 of the packing 30 fits.

[0037] The right side 14 of the door frame 10 has a bilaterally symmetrical structure with the left side 12. That is, as shown in FIG. 4, the right side 14 of the door frame 10 has a base plate 14a extending in the left-right direction and a vertical plate 14b protruding outward from the right end of the base plate 14a. The base plate 14a is the portion of the door frame 10 that faces the surface of the waterproof door main body 20. A holder 14c is provided on the outer surface (exterior) of the base plate 14a to which the right side 34 of the packing 30 is attached. The holder 14c has a fixed plate 14d fixed to the outer surface of the base plate 14a, a right side plate 14e protruding outward from the right end of the fixed plate 14d, and a left side plate 14f protruding outward from the left end of the fixed plate 14d. Inside the holder 14c, a groove 14g that opens outward is formed by the fixed plate 14d, the right side plate 14e, and the left side plate 14f. The groove 14g is a groove into which the right side portion 34 of the packing 30 fits.

[0038] As shown in FIG. 5, the upper edge portion 11 of the door frame 10 has a base portion 11a extending in the vertical direction and an upper plate portion 11b protruding outward from the upper end of the base portion 11a. The base portion 11a is the portion of the door frame 10 that faces the surface of the waterproof door main body 20. A holder 11c is provided on the outer surface (exterior surface) of the base portion 11a to which the upper portion 31 of the packing 30 is attached. The holder 11c has a fixed plate portion 11d fixed to the outer surface of the base portion 11a, an upper plate portion 11e protruding outward from the upper end of the fixed plate portion 11d, and a lower plate portion 11f protruding outward from the lower end of the fixed plate portion 11d. Inside the holder 11c, a groove 11g is formed by the fixed plate portion 11d, the upper plate portion 11e, and the lower plate portion 11f, opening outward. The groove 11g is a groove into which the upper portion 31 of the packing 30 fits.

[0039] As shown in FIG. 6, the lower edge portion 13 of the door frame 10 has a base plate portion 13a extending in the vertical direction and a lower plate portion 13b protruding outward from the lower end of the base plate portion 13a. The base plate portion 13a is the portion of the door frame 10 that faces the surface of the waterproof door main body 20. A holder 13c is provided on the outer surface (external surface) of the base plate portion 13a to which the lower portion 33 of the packing 30 is attached. The holder 13c has a fixed plate portion 13d fixed to the outer surface of the base plate portion 13a, a lower plate portion 13e protruding outward from the lower end of the fixed plate portion 13d, and an upper plate portion 13f protruding outward from the upper end of the fixed plate portion 13d. Inside the holder 13c, a groove 13g is formed by the fixed plate portion 13d, the lower plate portion 13e, and the upper plate portion 13f, opening outward. The groove 13g is a groove into which the lower portion 33 of the packing 30 fits.

[0040] In this way, the upper portion 31 of the packing 30 is attached to the upper side portion 11 of the door frame 10 by being held by the holder 11c of the upper side portion 11. The left side portion 32 of the packing 30 is attached to the left side portion 12 by being held by the holder 12c of the left side portion 12 of the door frame 10. The lower portion 33 of the packing 30 is attached to the lower side portion 13 by being held by the holder 13c of the lower side portion 13 of the door frame 10. The right side portion 34 of the packing 30 is attached to the right side portion 14 by being held by the holder 14c of the right side portion 14 of the door frame 10.

[0041] As shown in Figure 3, the left side 32 of the packing 30 is formed by stacking a first elastic member 32a with a rectangular cross section that is fixed to the left edge 12 of the door frame 10 and a second elastic member 32b with a rectangular cross section that is fixed to the surface of the first elastic member 32a opposite the door frame 10 and that contacts the surface of the waterproof door main body 20 in the closed state. Because the first elastic member 32a and the second elastic member 32b that make up the packing 30 both have a rectangular cross section and a simple shape, the packing 30 is less expensive than a conventional P-type packing. Furthermore, because the first elastic member 32a and the second elastic member 32b are simply stacked, the packing 30 is less expensive than a conventional packing that has a laminated structure in multiple locations.

[0042] The first elastic member 32a and the second elastic member 32b are made of, for example, foam rubber with a closed cell structure, foam rubber with semi-closed and semi-open cells, etc. They may also be made of thin, hollow packing. The first elastic member 32a may also be made of rubber without any bubbles.

[0043] The width dimension of the first elastic member 32a is set to be longer than the thickness dimension of the first elastic member 32a. Furthermore, the width dimension of the second elastic member 32b is set to be longer than the thickness dimension of the second elastic member 32b. Although not shown, if the depth dimension of the groove 12g is longer than the width dimension of the first elastic member 32a, the width dimension of the first elastic member 32a will be set to be shorter than the thickness dimension of the first elastic member 32a. Furthermore, the width dimension of the second elastic member 32b may be set to be shorter than the thickness dimension of the second elastic member 32b.

[0044] The thickness of the first elastic member 32a is set to be thicker than the second elastic member 32b. For example, the thickness of the second elastic member 32b can be set within a range of 20% to 40% of the thickness of the first elastic member 32a. The thickness of the first elastic member 32a can be set within a range of 7 mm to 20 mm, for example. The thickness of the second elastic member 32b can be set within a range of 2 mm to 6 mm, for example.

[0045] The hardness of the second elastic member 32b is set to be softer than that of the first elastic member 32a. The hardness of the first elastic member 32a can be in the range of 10 degrees to 50 degrees when measured using a type E durometer.

[0046] The second elastic member 32b is disposed so as to be located inside the surface of the waterproof door main body 20 relative to the edge 20a of the surface. Specifically, the width (left-right dimension) of the second elastic member 32b is set narrower than the width of the first elastic member 32a. The relative positional relationship in the left-right direction between the first elastic member 32a and the second elastic member 32b is set so that the right end of the second elastic member 32b coincides with the right end of the first elastic member 32a. When the right end of the second elastic member 32b coincides with the right end of the first elastic member 32a, the left end of the second elastic member 32b is positioned to the right of the left end of the first elastic member 32a, i.e., to the right of the edge 20a of the waterproof door main body 20, due to the narrow width of the second elastic member 32b. To maintain this positional relationship, the first elastic member 32a and the second elastic member 32b are integrated together using, for example, double-sided adhesive tape or double-sided adhesive tape. The first elastic member 32a and the second elastic member 32b may be integrated with an adhesive.

[0047] Furthermore, the left end of the first elastic member 32a (the end corresponding to the end 20a of the waterproof door main body 20) is positioned so as to coincide with the end 20a of the waterproof door main body 20. The part of the first elastic member 32a on the door frame 10 side is fitted into a groove 12g on the left side edge 12 of the door frame 10. The first elastic member 32a is bonded to the inner surface of the groove 12g. The first elastic member 32a is formed so as to protrude outward from the groove 12g in an uncompressed state. In short, the depth of the groove 12g is set to be shallower than the thickness dimension of the first elastic member 32a.

[0048] 4, the right side portion 34 of the packing 30 is formed by laminating a first elastic member 34a having a rectangular cross section fixed to the right side portion 14 of the door frame 10, and a second elastic member 34b having a rectangular cross section fixed to the surface of the first elastic member 34a opposite the door frame 10 and in contact with the surface of the waterproof door main body 20 in the closed state. The first elastic member 34a and the second elastic member 34b of the right side portion 34 are configured in the same manner as the first elastic member 32a and the second elastic member 32b of the left side portion 32.

[0049] 5, the upper part 31 of the packing 30 is formed by laminating a first elastic member 31a having a rectangular cross section fixed to the upper edge part 11 of the door frame 10 and a second elastic member 31b having a rectangular cross section fixed to the surface of the first elastic member 31a opposite the door frame 10 and in contact with the surface of the waterproof door main body 20 in the closed state. The first elastic member 31a and the second elastic member 31b of the upper part 31 are configured in the same manner as the first elastic member 32a and the second elastic member 32b of the left part 32.

[0050] 6, the lower portion 33 of the packing 30 is formed by laminating a first elastic member 33a having a rectangular cross section fixed to the bottom edge portion 13 of the door frame 10, and a second elastic member 33b having a rectangular cross section fixed to the surface of the first elastic member 33a opposite the door frame 10 and in contact with the surface of the waterproof door main body 20 in the closed state. The first elastic member 33a and the second elastic member 33b of the lower portion 33 are configured in the same manner as the first elastic member 32a and the second elastic member 32b of the left side portion 32, but the thickness of the second elastic member 33b is different.

[0051] That is, the thickness of the second elastic member 33b of the lower portion 33 is thicker than the thickness of the second elastic member 31b of the upper portion 31 (the thickness of the second elastic member 32b of the left portion 32 and the thickness of the second elastic member 34b of the right portion 34). Specifically, the thickness of the second elastic member 33b of the lower portion 33 is set to be 1.5 times or more the thickness of the second elastic member 31b of the upper portion 31. The upper limit of the thickness of the second elastic member 33b of the lower portion 33 can be set to be 2.5 times or less the thickness of the second elastic member 31b of the upper portion 31.

[0052] When the waterproof door main body 20 is closed by the door closer 40, the surface of the waterproof door main body 20 comes into contact with the second elastic members 31b, 32b, 33b, and 34b. The hardness of the second elastic members 31b, 32b, 33b, and 34b is set so that they are elastically deformed when pressed by the surface of the waterproof door main body 20 to which the biasing force of the door closer 40 acts. Specifically, the thickness of the second elastic member 33b of the lower part 33 is thicker than the other second elastic members 31b, 32b, and 34b, and this relatively thick second elastic member 33b elastically deforms to a thickness of 40% to 60% of its original thickness when the waterproof door main body 20 is closed by the door closer 40. On the other hand, the second elastic members 31b, 32b, and 34b elastically deform to a thickness of 70% or more of their original thickness when the waterproof door main body 20 is closed by the door closer 40. Therefore, simply by closing the waterproof door body 20, the sealing effect of the packing 30 can be obtained over the entire periphery of the waterproof door body 20.

[0053] If the other second elastic members 31b, 32b, and 34b were also made as thick as the second elastic member 33b of the lower portion 33, the biasing force of a typical door closer 40 would not be able to sufficiently compress and deform all of the second elastic members 31b, 32b, 33b, and 34b. In particular, if the compression amount of the second elastic member 33b of the lower portion 33, which is subject to strict requirements in terms of preventing water intrusion, is insufficient, a water leak may easily form between the lower portion 33 and the surface of the waterproof door main body 20, which may result in a decrease in waterproof performance. Taking this into consideration, in this embodiment, only the second elastic member 33b of the lower portion 33 is made thick.

[0054] FIG. 7 shows a case where low water pressure acts on the waterproof door body 20, such as when the water level outside the waterproof door body 20 is approximately 300 mm. When water pressure acts, external water enters between the door frame 10 and the waterproof door body 20 from the edge of the waterproof door body 20. When the water level is approximately 300 mm, even if the waterproof door body 20 is displaced inward by water pressure, only the second elastic members 31b, 32b, 33b, and 34b elastically deform, while the first elastic members 31a, 32a, 33a, and 34a hardly deform. When such water pressure acts, the water pressure received by the lower portion 33 of the packing 30 is the highest. However, the second elastic member 33b of this lower portion 33 is relatively thick and firmly adheres to the surface of the waterproof door body 20. This prevents the formation of a water leak between the lower portion 33 and the surface of the waterproof door body 20, resulting in high waterproof performance. That is, at low water pressure, sufficient waterproof performance can be obtained only by the elastic deformation of the second elastic members 31b, 32b, 33b, and 34b.

[0055] 8 shows a case where high water pressure is applied to the waterproof door main body 20, such that the water level outside the waterproof door main body 20 is 1 m or more. When high water pressure is applied to the waterproof door main body 20, the amount of inward displacement of the waterproof door main body 20 becomes larger than when the water pressure is low, and the surface of the waterproof door main body 20 strongly presses against the packing 30. When the packing 30 is strongly pressed by the waterproof door main body 20, the first elastic members 31 a, 32 a, 33 a, 34 a and the second elastic members 31 b, 32 b, 33 b, 34 b all elastically deform. At this time, because the second elastic members 31 b, 32 b, 33 b, 34 b are thin and soft, the second elastic members 31 b, 32 b, 33 b, 34 b are crushed and embedded in the first elastic members 31 a, 32 a, 33 a, 34 a.

[0056] These second elastic members 31b, 32b, 33b, 34b are arranged so as to be located inside the surface of the waterproof door main body 20 relative to the edge 20a of the surface, so that water is less likely to get in between the second elastic members 31b, 32b, 33b, 34b and the surface of the waterproof door main body 20. In addition, the second elastic members 31b, 32b, 33b, 34b buried in the first elastic members 31a, 32a, 33a, 34a are not directly subjected to high water pressure, and it is the first elastic members 31a, 32a, 33a, 34a that are relatively hard and do not easily deform even under high water pressure that are directly subjected to high water pressure, so that a water leak is less likely to form between the waterproof door main body 20 and the second elastic members 31b, 32b, 33b, 34b. Furthermore, since the packing 30 is made up of the first elastic members 31a, 32a, 33a, 34a and the second elastic members 31b, 32b, 33b, 34b, each having a rectangular cross section, it does not have a narrow contact area due to a curved surface like the conventional P-type packing, but has a wide surface contact with the surface of the waterproof door main body 20, which also makes it less likely that a water leak will form between it and the waterproof door main body 20.

[0057] Conventional waterproof doors require the door body to be tightly fastened to the door frame using a cremone handle or the like, but the waterproof door structure 1 according to this embodiment can prevent water from entering due to high water pressure using only the biasing force of the door closer 40. The waterproof door structure 1 according to this embodiment has the ability to prevent water from entering even when the water level is 3m.

[0058] Experimental results have shown that the waterproof door structure 1 according to this embodiment leaks less than 1 liter per square meter per hour when the set flood height is 0.3 m to 3 m. The waterproof performance of the waterproof door structure 1 according to this embodiment is equivalent to WS-6 in the JIS A 4716 flood prevention performance classification and HWL-5 in the JSTM flood prevention door flood prevention performance standard, so the waterproof door structure 1 according to this embodiment can achieve sufficient waterproof performance. This waterproof performance is for an opening dimension of 900 mm x 2100 mm, but similar waterproof performance can be achieved even if the opening dimension is changed.

[0059] 9, the second elastic member 33b provided on the bottom edge 13 of the door frame 10 is continuous from the left edge (one side edge) 12 to the right edge (the other side edge) 14 of the door frame 10. In FIG. 9, the lower portion of the packing 30 is shown enlarged, and the second elastic member 33b of the lower edge 33 of the packing 30 is continuous from the left end to the right end of the packing 30.

[0060] That is, in the waterproof door structure 1 of this embodiment, the waterproof door main body 20 is structured to rotate by the hinge 21, so when the waterproof door main body 20 is opened, the waterproof door main body 20 moves from the position shown by the imaginary line to the position shown by the solid line in Fig. 10. In this way, the part of the waterproof door main body 20 on the hinge 21 side moves so as to rub against the second elastic member 33b as the waterproof door main body 20 is opened. If the waterproof door main body 20 rubs against the edge portion 33c (shown only in Fig. 10) of the second elastic member 33b, there is a risk that the second elastic member 33b will peel off from the edge portion 33c. However, in this embodiment, since the second elastic member 33b is continuous over both ends in the left-right direction, the waterproof door main body 20 will not rub against the edge portion 33c of the second elastic member 33b, and peeling of the second elastic member 33b from the edge portion 33c can be suppressed and sufficient waterproof performance can be obtained.

[0061] As described above, according to the waterproof door structure 1 of this embodiment, the packing 30 is constructed by laminating the first elastic members 31a, 32a, 33a, 34a and the second elastic members 31b, 32b, 33b, 34b, each having a rectangular cross section, thereby simplifying the structure of the packing 30 and reducing the cost of the packing 30. Furthermore, the first elastic members 31a, 32a, 33a, 34a are made thicker than the second elastic members 31b, 32b, 33b, 34b, and the second elastic members 31b, 32b, 33b, 34b are also made softer than the first elastic members 31a, 32a, 33a, 34a, and the second elastic members 31b, 32b, 33b, 34b are arranged to be located inside the end 20a of the waterproof door main body 20, so that sufficient waterproofing performance can be obtained not only when low water pressure is applied but also when high water pressure is applied, without using a cremone handle or the like.

[0062] (Second embodiment) FIG. 11 is a schematic diagram of a second embodiment in which a safe 100 is adapted to include a door frame 10 that is not fixed to a structure, a waterproof door main body 20 that is rotatably supported on the door frame 10 via hinges 21, and a packing 30 that is a laminate of a first elastic member (not shown in FIG. 11) and a second elastic member (not shown in FIG. 11) similar to those in the waterproof door structure 1 of the first embodiment. In the second embodiment, sufficient waterproof performance can be obtained not only when low water pressure is applied but also when high water pressure is applied. The door frame 10 is provided in a main body portion (e.g., a housing) of the safe 100. Similarly, sufficient waterproof performance can be obtained even when the waterproof door structure 1 of the first embodiment is applied to, for example, the door of a device that manages documents and important keys, or the door of a case that stores electronic devices.

[0063] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0064] As described above, the waterproof door structure according to the present disclosure can be used to prevent water from entering various structures. [Explanation of symbols]

[0065] 1. Waterproof door structure 10 Door Frame 11 Top 13 Bottom 12g groove 20 Waterproof door body 30 Gasket 31a, 32a, 33a, 34a First elastic member 31b, 32b, 33b, 34b Second elastic member 40 Door closer (force generating device) 100 structures

Claims

1. A waterproof door structure comprising a door frame fixed to a structure, a waterproof door body rotatably supported by the door frame via a hinge, and a gasket interposed between the door frame and one surface of the waterproof door body and continuous in the circumferential direction of the waterproof door body, which prevents water from entering from the side where the other surface of the waterproof door body is located, The packing is made up of a first elastic member having a rectangular cross section fixed to a portion of the door frame facing one surface of the waterproof door body, and a second elastic member having a rectangular cross section fixed to a surface of the first elastic member opposite the door frame and in contact with one surface of the waterproof door body in the closed state, laminated together; The hardness of the second elastic member is set to be softer than that of the first elastic member, A waterproof door structure, wherein the second elastic member is positioned so as to be contained inside one surface of the waterproof door body rather than the end of the one surface.

2. The waterproof door structure according to claim 1, A waterproof door structure, wherein the thickness of the first elastic member is set to be thicker than that of the second elastic member.

3. The waterproof door structure according to claim 1, A waterproof door structure in which a groove is provided in a portion of the door frame facing one surface of the waterproof door body, into which the portion of the first elastic member on the door frame side fits.

4. The waterproof door structure according to claim 3, A waterproof door structure, wherein the first elastic member is formed so as to protrude from the groove in an uncompressed state.

5. The waterproof door structure according to claim 1, A biasing force generating device is provided to bias the waterproof door body in the closing direction, A waterproof door structure in which the hardness of the second elastic member is set so as to elastically deform when pressed by one surface of the waterproof door body to which the biasing force of the biasing force generating device acts.

6. The waterproof door structure according to claim 1, A waterproof door structure in which the thickness of the second elastic member provided on the lower edge portion of the door frame is set to be thicker than the thickness of the second elastic member provided on the upper edge portion of the door frame.

7. The waterproof door structure according to claim 1, A waterproof door structure in which the second elastic member provided at the lower edge portion of the door frame is continuous from one side edge portion to the other side edge portion of the door frame.

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