Waterproof door structure

Abstract

To ensure high water-stopping properties when subjected to water pressure while protecting a mechanism from moisture and salt damage by preventing the mechanism from being exposed to a water pressure receiving side.SOLUTION: A four-bar link mechanism 50, which has a first link 51 and a second link 52 that are rotatably connected to a waterproof door main body 20 and a door frame 10, is provided to be positioned on a back side of the waterproof door main body 20. When the waterproof door main body 20 is opened, the four-bar link mechanism 50 determines a movement trajectory of the waterproof door main body 20 so that an end of the waterproof door main body 20 on an elbow side moves outward and is positioned to the side of the door frame 10. When the waterproof door main body 20 in the closed state is subjected to water pressure at or above a predetermined level, a distance between an axis of the second link 52 on the waterproof door main body 20 side and an axis of the second link 52 on the door frame 10 side is changed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] For example, Patent Documents 1 and 2 disclose waterproof doors for preventing water from entering a facility. These doors include a frame provided at an opening in a structure and a door body attached to the frame by a biaxial hinge so as to be able to open and close freely, with a frame-shaped water stop attached to the periphery of the door body. When the door body is subjected to water pressure from the outside, the action of the biaxial hinge compresses and deforms the water stop between the door body and the frame, forcing them into tight contact, thereby closing the gap between the door body and the frame and ensuring watertightness. In Patent Documents 1 and 2, the biaxial hinge and lock are provided on the side of the door body that receives water pressure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-151717 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-196766 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the side of the door body that receives water pressure may be, for example, close to a water tank and therefore humid, or may face the sea and be subject to salt damage. In Patent Documents 1 and 2, the mechanism parts such as the biaxial hinges and locking mechanism are provided on the side of the door body that receives water pressure, so it is thought that the mechanism parts are susceptible to rust and corrosion due to the effects of humidity and salt damage. If rust or corrosion occurs in the mechanism parts, it may cause problems with opening, closing, and tightening the door body.

[0005] The present disclosure has been made in consideration of such points, and its purpose is to protect the mechanism from moisture and salt damage by preventing the mechanism from being exposed to the side receiving water pressure, while ensuring high water-stopping properties when subjected to water pressure. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present disclosure can be premised on a waterproof door structure that includes a packing interposed between a door frame fixed to a structure and one surface of a waterproof door body, and that prevents water from entering from the side that receives water pressure, where the other surface of the waterproof door body is located. A four-bar link mechanism is provided on the one side of the waterproof door body, and includes a first link that is rotatably connected to the waterproof door body and the door frame about an axis that extends in the vertical direction, and a second link that is rotatably connected to the waterproof door body and the door frame about an axis that extends in the vertical direction at a point away from the one side from the connection point of the first link. The four-bar link mechanism supports the waterproof door body so that it can be opened to the other side relative to the door frame. The four-bar link mechanism determines the movement trajectory of the waterproof door body so that when the waterproof door body is opened, the elbow-side end of the waterproof door body moves to the other side and is positioned to the side of the door frame, and is configured to change the distance between the axis of the second link on the waterproof door body side and the axis of the second link on the door frame side when the waterproof door body in a closed state is subjected to water pressure above a predetermined level.

[0007] According to this configuration, the four-bar link mechanism, which is the mechanical part that supports the waterproof door body so that it can be opened relative to the door frame, is provided on one side of the waterproof door body, i.e., the side that is not subjected to water pressure. Therefore, by keeping the waterproof door body closed, the four-bar link mechanism is less susceptible to the effects of moisture and salt damage, and rust and corrosion of the four-bar link mechanism are suppressed.

[0008] When opening the waterproof door body, the four-bar link mechanism moves the end of the waterproof door body on the elbow side to the other side, so it does not interfere with the door frame and allows for a smooth opening operation.

[0009] When the waterproof door body in the closed state is subjected to a water pressure above a certain level, the distance between the axes of the second link, which is located away from the first link on one side, changes, allowing the waterproof door body to move in parallel to one side as a whole. As a result, the packing between the door frame and one side of the waterproof door body is sufficiently compressed all around, closing the gap between the door frame and the waterproof door body and ensuring high watertightness.

[0010] The second links may have an expandable section for changing the center-to-center distance, which allows the center-to-center distance of the second links to be changed when the waterproof door body is subjected to a water pressure of a predetermined level or more and the second links are subjected to a longitudinal force.

[0011] The second link may be divided into a door-side link component connected to the waterproof door main body and a frame-side link component connected to the door frame. In this case, the expansion and contraction section is provided between the door-side link component and the frame-side link component, so that the axis distance of the second link can be changed when the waterproof door main body is subjected to a water pressure equal to or greater than a predetermined level.

[0012] An elastic member may be provided between the door-side link component and the frame-side link component. The elastic member may be a compression spring, in which case the door-side link component may be provided with a one-end abutment plate portion that abuts against one end of the compression spring, and the frame-side link component may be provided with an other-end abutment plate portion that abuts against the other end of the compression spring. [Effects of the Invention]

[0013] As explained above, in the waterproof door structure of the present disclosure, a four-bar link mechanism is provided on the side opposite to the side receiving water pressure to protect the mechanism from moisture and salt damage, while allowing for smooth opening by preventing the elbow-side end of the waterproof door body from interfering with the door frame during opening, and furthermore, when subjected to water pressure above a predetermined level, the waterproof door body is moved in parallel as a whole, compressing the gasket all around, ensuring high watertightness. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a waterproof door structure according to an embodiment of the present invention, showing the waterproof door structure in a closed state. [Figure 2] FIG. 2 is a view equivalent to FIG. 1 showing the case where the valve is in an open state. [Figure 3] FIG. 2 is a front view of the waterproof door structure in an open state. [Figure 4] FIG. 2 is a schematic diagram showing a four-bar link mechanism. [Figure 5] FIG. 4 is an enlarged perspective view showing a second link and its surroundings. [Figure 6] FIG. 10 is a plan view showing the waterproof door being changed from a closed state to an open state. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] 1 and 2 are perspective views of a waterproof door structure 1 according to an embodiment of the present invention. The waterproof door structure 1 is provided in a structure 100 (part of which is shown in phantom lines only in FIG. 2), such as a facility with a water tank, a facility (building) facing the sea, a house, an office, a factory, a warehouse, etc., and is intended to prevent water in a space outside the waterproof door structure 1 from infiltrating into a space inside the waterproof door structure 1. FIG. 2 shows a schematic example of a part of the structure 100, and the shape of the structure 100 is not limited to the shape shown in this figure.

[0017] The structure 100 is not limited to the above-mentioned examples, 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 which 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 provided to protect important equipment or areas from water infiltration.

[0018] In the description of this embodiment, the side that receives water pressure 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 direction are provided solely for the convenience of description and do not limit the directions during installation or use. The side that receives water pressure can also be referred to as the wet area, and the side that prevents water from entering can also be referred to as the dry area.

[0019] The waterproof door structure 1 comprises a door frame 10 fixed to a structure 100, a waterproof door body 20, and a gasket 30, and is configured to prevent water from entering from the outside of the waterproof door body 20 (the side that receives water pressure). 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 right side 14 of the door frame 10 has a support bracket 14b that supports a first link and a second link, which will be described later. The shape of the door frame 10 is not limited to the shape shown in the drawings, and the ratio of the vertical dimension to the horizontal dimension (aspect ratio) of the door frame 10 can be set as desired.

[0020] 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 back surface, and the other surface of the waterproof door body 20 is called the front surface.

[0021] 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 surface of the waterproof door main body 20 is located, and is made of an elastic material such as rubber.

[0022] The packing 30 is fixed to the outward-facing surface of the door frame 10. That is, the packing 30 has an upper portion 31 extending in the left-right direction along the upper edge portion 11 of the door frame 10, a left portion 32 extending in the up-down direction along the left edge portion 12 of the door frame 10, a lower portion 33 extending in the left-right direction along the lower edge portion 13 of the door frame 10, and a right portion 34 extending in the up-down direction along the right edge portion 14 of the door frame 10. The packing 30 may also be fixed to the back surface (the surface facing inward) of the waterproof door main body 20. The upper portion 31 and the lower portion 33 are approximately parallel to each other, and the left portion 32 and the right portion 34 are also approximately parallel to each other. That is, 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 side portion 34 extends downward from the right end of the upper side portion 31, and the right end of the lower side portion 33 is connected to the lower end of the right side portion 34.

[0023] As shown in Figures 2 and 3, the waterproof door main body 20 has a closing mechanism 40. The closing mechanism 40 is provided on the back side of the waterproof door main body 20, and has an operating handle 41, a latch 42, a transmission mechanism 43 (shown by a broken line only in Figure 2) that transmits the operating force of the operating handle 41 to the latch 42, and a cover member 44 that covers the transmission mechanism 43. A handle 45 is provided on the cover member 44. The closing mechanism 40 corresponds to a mechanical part of the waterproof door main body 20. By providing the closing mechanism 40 on the back side of the waterproof door main body 20, it is not exposed to the side that receives water pressure, and the closing mechanism 40 can be protected from moisture and salt damage.

[0024] The latches 42 include one that advances to the left and one that advances to the right. When the operating handle 41 is rotated in one direction while the waterproof door body 20 is in the closed state, the rotational movement of the operating handle 41 is converted by the transmission mechanism 43 into the leftward and rightward advancement movements of the latches 42. As a result, the latches 42 are inserted into and engaged with the left-side receiving portion 16 fixed to the left side edge 12 of the door frame 10 and the right-side receiving portion 17 fixed to the right side edge 14 of the door frame 10, and the waterproof door body 20 is fixed to the door frame 10 in the closed state. On the other hand, when the operating handle 41 is rotated in the opposite direction, the rotational movement of the operating handle 41 is converted by the transmission mechanism 43 into the retreating movement of the latches 42, so that the latches 42 are released from the left-side receiving portion 16 and the right-side receiving portion 17, enabling the waterproof door body 20 to be opened. The structure of the closing mechanism 40 is not limited to the above-described structure, and although not shown, the latch may be operated by a lever or the like, or the latch may move back and forth in the vertical direction.

[0025] The left side of the waterproof door body 20 is the door-edge side, and the right side of the waterproof door body 20 is the elbow side. The waterproof door structure 1 is equipped with a four-bar link mechanism 50 that supports the waterproof door body 20 relative to the right side 14 of the door frame 10 so that it can open outward. The four-bar link mechanisms 50 are provided above and below the vertical center of the waterproof door body 20. The upper four-bar link mechanism 50 and the lower four-bar link mechanism 50 are provided on the back side of the waterproof door body 20. The upper four-bar link mechanism 50 and the lower four-bar link mechanism 50 correspond to the mechanical parts of the waterproof door body 20. Since the upper four-bar link mechanism 50 and the lower four-bar link mechanism 50 are provided on the back side of the waterproof door body 20, they are not exposed to the side that receives water pressure, and the upper four-bar link mechanism 50 and the lower four-bar link mechanism 50 can be protected from moisture and salt damage.

[0026] The upper four-bar link mechanism 50 and the lower four-bar link mechanism 50 are the same, and in this embodiment, the upper four-bar link mechanism 50 is turned upside down and used as the lower four-bar link mechanism 50. The upper four-bar link mechanism 50 will be described in detail below.

[0027] As shown in Figure 4 when the waterproof door body 20 is in the closed state, the four-bar link mechanism 50 comprises a first link 51 and a second link 52 for connecting the waterproof door body 20 to the door frame 10. The first link 51 is the main elbow, and is provided so as to extend in the left-right direction along the back surface of the waterproof door body 20 when the waterproof door body 20 is in the closed state. The first link 51 is made of a high-strength and high-rigidity member so that it can support the weight of the waterproof door body 20.

[0028] One end of the first link 51 (the end on the right side in FIG. 4) is connected to a support bracket 14b of the link support plate 14a via a first support shaft 61. The first support shaft 61 extends in the vertical direction. Therefore, the one end of the first link 51 is connected to the door frame 10 via the first support shaft 61 so as to be rotatable around an axis extending in the vertical direction.

[0029] The other end of the first link 51 (the end on the left side in FIG. 4) is connected via a second support shaft 62 to a support part 20a provided in the middle part of the waterproof door main body 20 in the left-right direction. The second support shaft 62 is approximately parallel to the first support shaft 61 and extends in the vertical direction. Therefore, the other end of the first link 51 is connected via the second support shaft 62 to be rotatable around an axis extending in the vertical direction relative to the waterproof door main body 20. The axis of the first link 51 on the waterproof door main body 20 side is the axis of the second support shaft 62, and the axis of the first link 51 on the door frame 10 side is the axis of the first support shaft 61.

[0030] The second link 52 is a control link that controls the movement of the waterproof door main body 20, and is not intended to support the weight of the waterproof door main body 20, so it is made of a material with lower rigidity than the first link 51. Specifically, the cross-sectional area of the second link 52 in a direction perpendicular to the longitudinal direction is smaller than the cross-sectional area of the first link 51 in the same direction. Therefore, the second link 52 is a thinner link than the first link 51. In addition, the length of the second link 52 is set longer than the length of the first link 51.

[0031] The second link 52 is provided so that its longitudinal direction coincides with the left-right direction when the waterproof door body 20 is in the closed state. In a plan view, the second link 52 is spaced inward from the first link 51. In addition, as shown in Figures 2 and 3, the second link 52 is spaced upward from the first link 51.

[0032] One end of the second link 52 (the end on the right side in FIG. 4) is connected to the support bracket 14b via a third support shaft 63. The third support shaft 63 is substantially parallel to the first support shaft 61 and extends in the vertical direction. Therefore, the one end of the second link 52 is connected to the door frame 10 via the third support shaft 63 so as to be rotatable around an axis extending in the vertical direction.

[0033] The other end of the second link 52 (the end on the left side in FIG. 4 ) is connected via a fourth support shaft 64 to a support part 20b provided at the middle part of the waterproof door main body 20 in the left-right direction. Since the second link 52 is longer than the first link 51, the other end of the second link 52 is located to the left of the other end of the first link 51 on the waterproof door main body 20. Therefore, the fourth support shaft 64 is positioned to the left of the second support shaft 62 on the waterproof door main body 20. The fourth support shaft 64 is approximately parallel to the third support shaft 63 and extends in the vertical direction. Therefore, the other end of the second link 52 is connected via the fourth support shaft 64 to be rotatable around an axis extending in the vertical direction relative to the waterproof door main body 20. The axis of the second link 52 on the waterproof door main body 20 side is the axis of the fourth support shaft 64, and the axis of the second link 52 on the door frame 10 side is the axis of the third support shaft 63. In other words, the second link 52 is connected to the waterproof door body 20 and the door frame 10 so as to be rotatable around an axis extending in the vertical direction at a point spaced inward from the connection point of the first link 51.

[0034] As shown in Figure 4, the first support shaft 61 and the third support shaft 63 of the four-bar link mechanism 50 are spaced apart in the inward / outward direction of the waterproof door main body 20. The first support shaft 61 and the third support shaft 63 are supported by the support bracket 14b, so that the distance between them in the inward / outward direction and the distance between them in the left / right direction of the waterproof door main body 20 are kept constant. The support bracket 14b also constitutes a part of the four-bar link mechanism 50.

[0035] The second support shaft 62 and the fourth support shaft 64 of the four-bar link mechanism 50 are spaced apart in the inward / outward direction of the waterproof door main body 20, and also spaced apart in the left-right direction of the waterproof door main body 20. The second support shaft 62 and the fourth support shaft 64 are supported by support parts 20a and 20b provided on the waterproof door main body 20, respectively, so that the distance between them in the inward / outward direction and the distance between them in the left-right direction of the waterproof door main body 20 are kept constant. The support parts 20a and 20b provided on the waterproof door main body 20 also form part of the four-bar link mechanism 50.

[0036] The four-bar link mechanism 50 is a mechanism for operating the waterproof door main body 20 in the opening and closing directions and for regulating the movement trajectory of the waterproof door main body 20. The movement trajectory of the waterproof door main body 20 can be changed as desired by adjusting the respective lengths of the first link 51 and the second link 52 that constitute the four-bar link mechanism 50, the relative positional relationship and installation positions of the first link 51 and the second link 52, and the relative positional relationship and installation positions of the first to fourth support shafts 61 to 64. The four-bar link mechanism 50 of this embodiment regulates the movement trajectory of the waterproof door main body 20 so that, during the opening operation of the waterproof door main body 20, the end portion on the elbow side of the waterproof door main body 20 moves outward and is positioned to the right of the right side portion 14 of the door frame 10.

[0037] As shown in an enlarged view of the second link 52 in Figure 5, the second link 52 has an expandable structure, unlike the first link 51. That is, when the waterproof door main body 20 in the closed state is subjected to a water pressure equal to or greater than a predetermined level, the second link 52 is configured to change the distance between the axis of the second link 52 on the waterproof door main body 20 side and the axis of the second link 52 on the door frame 10 side. Specifically, the second link 52 is divided into a door-side link component 53 connected to the waterproof door main body 20 and a frame-side link component 54 connected to the door frame 10, and has an expandable portion 55 between the door-side link component 53 and the frame-side link component 54. The expandable portion 55 has a compression spring 55a as an elastic member provided between the door-side link component 53 and the frame-side link component 54.

[0038] The door-side link component 53 is made of a rod or plate material that extends linearly. The door-side link component 53 is formed longer than the frame-side link component 54. The end of the door-side link component 53 opposite the frame-side link component 54 is connected to the support part 20b of the waterproof door main body 20 by a fourth support shaft 64. In addition, the end of the frame-side link component 54 opposite the door-side link component 53 is connected to the support bracket 14b of the door frame 10 by a third support shaft 63.

[0039] A vertical plate portion 53a that extends in the up-down direction and protrudes to the right is provided at the end of the door-side link component 53 opposite the fourth support shaft 64. A one-end abutment plate portion 53b is supported at an intermediate portion in the protruding direction of the vertical plate portion 53a so as to be slidable in the longitudinal direction of the second link 52. The one-end abutment plate portion 53b extends in a direction perpendicular to the longitudinal direction of the door-side link component 53.

[0040] The frame-side link component 54 is composed of a plate material extending in a direction perpendicular to the vertical plate portion 53a. An other-end abutment plate portion 54b is supported in an intermediate portion of the frame-side link component 54 so as to be slidable in the longitudinal direction of the second link 52. Slits 54c, 53c for accommodating compression springs 55a are formed in a portion of the frame-side link component 54 closer to the tip than the other-end abutment plate portion 54b and in a portion of the door-side link component 53 closer to the tip than the one-end abutment plate portion 53b, respectively. The portion of the frame-side link component 54 where the slit 54c is formed is adapted to be inserted into a notch 53e formed in the one-end abutment plate portion 53b, thereby enabling relative movement in the longitudinal direction of the second link 52 between the portion of the frame-side link component 54 where the slit 54c is formed and the one-end abutment plate portion 53b. A pin 54f for preventing slipping out is provided at the tip of the frame side link component 54, so that the part of the frame side link component 54 where the slit 54c is formed does not completely slip out of the cutout portion 53e.

[0041] Furthermore, the portion of the door-side link component 53 where the slit 53c is formed is adapted to be inserted into a notch 54e formed in the other-end abutment plate portion 54b, which allows the portion of the door-side link component 53 where the slit 53c is formed and the other-end abutment plate portion 54b to move relatively in the longitudinal direction of the second link 52. Similar to the frame-side link component 54, the tip of the door-side link component 53 is provided with a retaining pin (not shown) so that the portion of the door-side link component 53 where the slit 53c is formed does not completely come out of the notch 54e.

[0042] When compression spring 55a is housed in slits 53c and 54c, the direction of expansion and contraction of compression spring 55a is the longitudinal direction of second link 52. The outer periphery of compression spring 55a is supported from four directions by two edges of slit 53c and two edges of slit 54c. This holds compression spring 55a in slits 53c and 54c. One end of compression spring 55a housed in slits 53c and 54c abuts against one end abutment plate portion 53b, and the other end of compression spring 55a abuts against other end abutment plate portion 54b.

[0043] As shown in Figure 6, a stopper 18 is provided on the right side of the door frame 10. Figure 6 (A) shows the waterproof door body 20 in a completely closed state. Figures (B) to (D) show the waterproof door body 20 in the middle of transitioning from a closed state to an open state. Figure 6 (E) shows the waterproof door body 20 in the open state. As shown in Figures (B) to (E), the movement trajectory of the waterproof door body 20 is determined by the four-bar link mechanism 50, and during normal opening and closing operations, the length of the second link 52 is maintained at a constant length as designed. In other words, the spring constant of the compression spring 55a is set so that the length of the second link 52 does not change during normal opening and closing operations.

[0044] The four-bar link mechanism 50 moves the end (right end) on the base side of the waterproof door main body 20 outward and positions it on the right side of the right side 14 of the door frame 10, so that the back surface of the waterproof door main body 20 can be abutted against the stopper 18. In this way, the end on the base side of the waterproof door main body 20 is moved outward from the initial stage of opening the waterproof door main body 20, so the waterproof door main body 20 does not interfere with the door frame 10 and a smooth opening operation is possible. When closing the waterproof door main body 20, the order shown by the arrows in Figure 6 is reversed.

[0045] Next, as shown in FIG. 4, we will explain the case where the waterproof door body 20 is subjected to a water pressure of a predetermined level or higher from the outside when it is in the closed state. Pressure of a predetermined level or higher can be defined as the pressure experienced when the water level outside is several centimeters or higher above the bottom edge of the waterproof door body 20. When the waterproof door body 20 is subjected to such water pressure from the outside, a longitudinal force acts on the second link 52, which is located inwardly away from the first link 51. When the second link 52 is subjected to a longitudinal force, it expands and contracts due to its expansion / contraction section 55, changing the center-to-center distance of the second link 52. As a result, the movement of the waterproof door body 20 is no longer restricted by the second link 52, allowing the waterproof door body 20 to move inward in a parallel manner. Therefore, the gasket 30 interposed between the door frame 10 and the waterproof door body 20 can be compressed evenly and sufficiently around the entire circumference, thereby sealing the gap between the door frame 10 and the waterproof door body 20 and ensuring high watertightness.

[0046] The above-described embodiment is merely illustrative in all respects and should not be construed as limiting. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention, and the following modifications are also included in the present invention.

[0047] For example, instead of the compression spring 55a, an elastic member such as rubber or elastomer may be used. Also, instead of the compression spring 55a, a hydraulic cylinder, a gas cylinder, or the like may be used. Also, the compression spring 55a may be combined with rubber or elastomer, or the compression spring 55a may be combined with a hydraulic cylinder, a gas cylinder, or the like.

[0048] The second link 52 itself may be made of an expandable material, such as a spring, hydraulic cylinder, or gas cylinder. The second link 52 itself may be made of an elastically deformable material, such as rubber, plastic, or metal. In these cases, the waterproof door body 20 can be moved inward in a parallel fashion when subjected to a water pressure above a predetermined level. The second link 52 may be rod-shaped, which expands and contracts when subjected to a water pressure above a predetermined level, or may be plate-shaped, which expands and contracts when subjected to a water pressure above a predetermined level; its shape is not particularly limited. The second link 52 may also be curved or bent. In this case, the second link 52 deforms linearly when subjected to a water pressure above a predetermined level, thereby changing the center-to-center distance.

[0049] Furthermore, the insertion hole in the second link 52 through which the third support shaft 63 passes may be an elongated hole, or may be a hole larger than the outer diameter of the third support shaft 63. In this case, the second link 52 and the third support shaft 63 are fastened together so that they do not move relative to each other in the radial direction of the third support shaft 63 during normal opening and closing operations. This fastening force is set to a force that allows the second link 52 and the third support shaft 63 to move relative to each other in the radial direction of the third support shaft 63 only when they are subjected to a water pressure equal to or greater than a predetermined level. Similarly, the insertion hole in the second link 52 through which the fourth support shaft 64 passes may be an elongated hole, or may be a hole larger than the outer diameter of the fourth support shaft 64. [Industrial Applicability]

[0050] 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]

[0051] 1. Waterproof door structure 10 Door Frame 20 Waterproof door body 30 Gasket 50 4-bar link mechanism 51 First Link 52 Second Link 53 Door side link component 54 Frame side link component 55 Telescopic part 55a compression spring

Claims

1. A waterproof door structure that includes a packing interposed between a door frame fixed to a structure and one surface of a waterproof door body, and that prevents water from entering from the side that receives water pressure where the other surface of the waterproof door body is located, a first link rotatably connected to the waterproof door body and the door frame around an axis extending in the vertical direction, and a second link rotatably connected to the waterproof door body and the door frame around an axis extending in the vertical direction at a point away from the connecting point of the first link to the one side, and a four-bar link mechanism supporting the waterproof door body so as to be able to open to the other side relative to the door frame is provided so as to be positioned on the one side of the waterproof door body, The four-bar link mechanism determines the movement trajectory of the waterproof door body so that the end portion on the elbow side of the waterproof door body is moved to the other side and positioned to the side of the door frame when the waterproof door body is opened, A waterproof door structure configured to change the distance between the axis of the second link on the waterproof door body side and the axis of the second link on the door frame side when the waterproof door body in a closed state is subjected to a water pressure equal to or greater than a predetermined level.

2. The waterproof door structure according to claim 1, The second link has an expandable portion.

3. The waterproof door structure according to claim 2, The second link is divided into a door-side link component connected to the waterproof door body and a frame-side link component connected to the door frame, A waterproof door structure, wherein the expansion and contraction portion is provided between the door-side link component and the frame-side link component.

4. The waterproof door structure according to claim 3, A waterproof door structure in which an elastic member is provided between the door-side link component and the frame-side link component.

5. The waterproof door structure according to claim 4, The elastic member is a compression spring, The door-side link component is provided with a one-end abutment plate portion that abuts against one end of the compression spring, A waterproof door structure, wherein the frame-side link component is provided with an other-end abutment plate portion that abuts against the other end of the compression spring.

6. The waterproof door structure according to claim 1, A waterproof door structure, wherein the second link is made of a member having lower rigidity than the first link.

Images