Lid device and odor prevention device for sewage systems

Abstract

The present invention provides a lid device with a simple structure that allows for easy attachment and detachment while preventing the movement of foreign objects between the inside and outside of structures such as rainwater drains, and an odor prevention device for sewers using this lid device. [Solution] A lid device 10 comprising a main body 11 that is detachably attached to an opening so as to cover the opening of a structure, a through-hole 11a provided in the main body 11, and a flap valve 12 that is displaced outward from the main body 11 to open the through-hole 11a, wherein a handle 13 is provided on the inside of the flap valve 12 that can support the main body 11 together with the flap valve 12, and the lid device can be supported by the handle 13 while pressurizing the flap valve 12 in the direction of closing the through-hole 11a.

Description

Technical Field

[0001] The present invention relates to a lid device and an odor prevention device for sewer systems.

Background Art

[0002] For example, in a rainwater inlet, a gutter is arranged along the side edge of a road, and a lid is placed over the gutter so that rainwater and the like are guided into the rainwater inlet. However, since a water intake is provided in this lid, during rainfall, foreign substances such as garbage and fallen leaves scattered on the road enter through the water intake, pass through the rainwater inlet, and invade the sewer pipe. Then, it emits a strange odor and becomes a source of mosquitoes and the like. To prevent this, conventionally, there is known an odor prevention device for sewer systems that covers the opening of a rainwater inlet with a detachable lid member and closes the drain outlet of the member with a flap valve to suppress the release of odors (see Patent Documents 1 to 4). Thus, when foreign substances such as garbage and fallen leaves enter through the water intake or the like that opens in the lid together with rainwater during rainfall, they accumulate in the odor prevention device for sewer systems to prevent them from flowing down into the rainwater inlet. In these odor prevention devices for sewer systems, a top plate portion is arranged between the edge block constituting the opening of the rainwater inlet and the lid, a box body portion is provided so as to be recessed downward under the water intake of the top plate portion, and a lid device is used that normally holds the drain outlet closed by an openable and closable flap valve at the drain outlet of the box body portion.

[0003] In such a lid device as an odor prevention device for sewer systems, normally, the drain outlet is closed with a flap valve so that the odor in the rainwater inlet is not released to the outside. On the other hand, during rainfall, when rainwater flows into the rainwater inlet from the surrounding road surface, sidewalk surface, etc., the rainwater accumulates in the box body installed in the rainwater inlet. When a certain amount of rainwater flows in, the flap valve opens due to water pressure, and the flowing rainwater is drained into the rainwater inlet and then flows down into the sewer.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Patent No. 4846796 [Patent Document 2] Patent No. 5064863 [Patent Document 3] Patent No. 4515993 [Patent Document 4] Patent No. 4651021 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, if such foreign objects fall into the rainwater drain, they can flow into the sewer system, causing blockages and leading to unpleasant odors due to decomposition. Therefore, the lid device needs to be removed and cleaned regularly. By the way, conventionally, lid devices are installed to cover the openings of structures such as rainwater drains. As a result, if foreign objects such as garbage or fallen leaves enter from above the lid device, they accumulate in the lid device, obstructing the flow of rainwater into the structure. However, with conventional lid devices used in sewer odor prevention systems, it was not easy to remove the lid device from structures such as rainwater drains. Specifically, when attempting to remove foreign objects from inside the lid device by removing the lid device from the opening of a structure such as a rainwater drain, the flap valve, which can be opened and closed, would open when the lid device was removed, causing the foreign objects to fall into the structure such as a rainwater drain. This resulted in a time-consuming removal and installation process that required additional work to remove the foreign objects.

[0006] On the other hand, adding a locking mechanism to the flap valve to prevent foreign objects from falling in would require operating the locking mechanism, which is time-consuming, and if the locking mechanism is not released, rainwater would not be able to flow down. Moreover, adding a locking mechanism would complicate the structure, making manufacturing more time-consuming and costly. Therefore, in order to install lid devices on a large number of structures such as rainwater catch basins, it is necessary that they be easy and inexpensive to mass-produce.

[0007] Therefore, the present invention aims to provide a lid device with a simple structure that can be easily attached to and detached from structures such as rainwater drains without causing foreign objects such as garbage and fallen leaves accumulated on the lid device to fall out, and a sewer odor prevention device using the lid device. [Means for solving the problem]

[0008] The present invention, which solves the above problems, is a lid device comprising a main body that is detachably attached to an opening in a structure so as to cover the opening, a through-hole provided in the main body, and a flap valve that displaces outward from the main body to open the through-hole, wherein a handle is provided on the inside of the flap valve that can support the main body together with the flap valve, and the lid device can be held while pressurizing the flap valve in the direction of closing the through-hole by supporting it with the handle.

[0009] In the lid device of the present invention, a flap valve is provided that displaces outward from the main body to open the through-hole, and a handle is provided on the inside of the flap valve that can support the main body together with the flap valve. Therefore, when cleaning, the lid device can be attached to and detached from the opening of the structure by supporting it with this handle, and the flap valve can be held in the direction of closing the through-hole by the supporting force.

[0010] Therefore, when attaching or detaching the lid device to an opening in a structure, if the lid device is supported by the handle and lifted or lowered, the flap valve can hold the through-hole closed. In other words, by supporting the lid device by gripping or hooking the handle and performing the attachment or detachment work on the opening in the structure, the through-hole can be easily kept closed during work without the need to provide a special structure or perform special work to close the through-hole.

[0011] This prevents foreign objects from moving through the opening when attaching or detaching the lid device to the opening of a structure. For example, foreign objects that were previously prevented from entering the structure by the lid device can be kept in a closed state during the attachment or detachment of the lid device, preventing them from falling out when the opening is accidentally opened. This prevents them from entering the structure through the opening. Therefore, it is possible to easily attach and detach the lid while preventing the movement of foreign objects between the inside and outside of the structure, and to provide a lid device with a simple structure. Here, "foreign matter" refers to substances and objects such as dirt and fallen leaves that accumulate in the main body of the lid device due to the closed flap valve, rather than being discharged through the through-hole in the main body.

[0012] In this lid device, the flap valve may be formed larger than the through-hole and pivotably mounted on the outer side of the main body to close the through-hole. In this way, since the flap valve, which is larger than the through-hole, is pivotably mounted on the inner side of the main body structure, the through-hole can be easily opened and closed by the pivoting of the flap valve, and when the lid device is supported by the handle, the flap valve can stably support the area around the through-hole.

[0013] This lid device is designed to be attached to an upward-facing opening, such as those found in rainwater drains. By providing a downward-facing recess in the main body and creating a through-hole in the recess, foreign objects that are normally prevented from entering the structure can accumulate in the downward-facing recess, and these objects will not be able to enter the structure through the through-hole.

[0014] In this case, by providing a handle that protrudes from the inside of the recess, the lid device can be easily attached and detached without dropping any foreign matter accumulated in the recess by supporting it by gripping or hooking the handle.

[0015] In one aspect of the present invention, a lid device is used to attach to the opening of a structure that serves as a rainwater catch basin, and the recess of this lid device can be configured to allow water to flow in along with foreign matter such as garbage and fallen leaves. With this configuration, the opening of the rainwater catch basin is normally kept closed by the lid device, thus preventing foreign matter such as garbage and fallen leaves from entering the rainwater catch basin. When rainwater flows into the lid device during rainfall, the weight of the rainwater causes the flap valve to swing and displace, creating a gap. Rainwater flows down into the rainwater catch basin through this gap, while the flap valve prevents foreign matter from entering the rainwater catch basin, allowing the incoming rainwater to flow down into the rainwater catch basin through the opening.

[0016] Furthermore, when detaching the lid device from the opening of the rainwater drain during inspection or work, supporting it by gripping the handle while detaching it ensures that the flap valve securely closes the opening. This allows the lid device to be detached from the opening while retaining any foreign matter accumulated inside the main body of the lid device, preventing the accumulated foreign matter from entering the rainwater drain.

[0017] In this configuration, the lid device has a through-hole that is opened laterally in a recess in the main body, and a flap valve with a handle is pivotally fixed above the through-hole, closing the through-hole by its own weight, and is configured to increase its opening degree as the amount of water contained in the recess increases. In this way, by adjusting the position, shape, size, and weight of the flap valve with a handle, the lid device can be opened and closed depending on whether it is raining or not, and the amount of water flowing into the rainwater catch basin can be adjusted by the flap valve of the lid device.

[0018] The sewer odor prevention device of the present invention, which solves the above problems, consists of a lid device as described above. By using the lid device in this way as an odor prevention device, the release of odors from the rainwater drain to the outside can also be prevented by the flap valve, thereby improving the surrounding environment. [Effects of the Invention]

[0019] According to the lid device and the sewer odor prevention device of the present invention as described above, it is possible to provide a lid device with a simple structure that can easily perform the attachment and detachment work while preventing the movement of foreign objects between the inside and outside of the structure, and a sewer odor prevention device using the lid device.

Brief Description of the Drawings

[0020] [Figure 1] The lid device according to an embodiment of the present invention is shown, where (a) is a perspective view, (b) is a side view thereof, and (c) is a perspective view showing the state where the flap valve is open. [Figure 2] (a) is a cross-sectional view showing the state where the lid device according to an embodiment of the present invention is attached to the opening of the structure, and (b) is a perspective view of the vicinity of the opening shown in part in cross-section. [Figure 3] It is an exploded perspective view showing the state where the lid device according to an embodiment of the present invention is attached to the opening of a rainwater pit as a structure. [Figure 4] It is a perspective view showing the usage state of the lid device according to an embodiment of the present invention, where (a) shows the state of supporting the lid device with foreign objects deposited, and (b) shows the state of removing the foreign objects deposited on the lid device.

Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, an example of using the lid device as a sewer odor prevention device will be described. FIG. 1(a) is a view of the lid device of the present invention seen obliquely from above, (b) is a side view thereof, (c) shows the state where the flap valve is open, FIG. 2(a) is a side cross-sectional view of the state where the lid device is attached to the opening of the structure, and (b) is a plan view thereof.

[0022] The structure to which the lid device 10 of this embodiment is attached is a storm drain 30 in a sewer system, as shown in Figure 2. This storm drain 30 is buried in the edge of a road 35 on the sidewalk 36 side. A side ditch (not shown) may be connected to the storm drain 30. It may also be connected to an underground sewer pipe (not shown) by a connecting pipe 31.

[0023] A rectangular cover placement section 33 is provided through the edge block 32 installed on top of the rainwater catch basin 30, and a cover 34 is fitted into this cover placement section 33. The cover placement section 33 of the edge block 32 has a through opening 33a in the center, and a stepped section 33b for placing the cover 34 is provided around the inner circumference of the through opening 33a. On the other hand, the cover 34 has an intake opening 34a that penetrates from the top and bottom so that rainwater and other water from the road surface 35 or sidewalk surface 36 can flow into the rainwater catch basin 30.

[0024] As shown in detail in Figure 1, the lid device 10 is configured to include a main body 11 that is mounted to cover the opening of the rainwater drain 30, a flap valve 12 that opens and closes the through-hole 11a of the main body 11, and a handle 13 for supporting the main body 11 together with the flap valve 12.

[0025] Figure 3 is an exploded perspective view showing the lid device of this embodiment installed on a rainwater catch basin. The lid device 10 of this embodiment is installed on the edge block 32 of the rainwater catch basin 30. Therefore, in this embodiment, the edge block 32 having a through opening 33a constitutes an opening 14 for installing the lid device 10. Here, the outer periphery of the main body portion 11 of the lid device is sandwiched between the lid placement portion 33 and the lid 34, and a recess 15, which will be described later, provided in the central part of the main body portion 11 is positioned to protrude into the inner cavity 32a of the edge block 32.

[0026] As shown in Figures 1(a) to (c), the main body 11 of the lid device 10 has a top plate portion 16 having a water intake port 16a, and a recess 15 joined to the top plate portion 16 and arranged to be recessed downwards. The top plate portion 16 is made of a plate corresponding to the upper surface of the stepped portion 33b provided in the lid placement portion 33 of the opening 14. A water intake port 16a communicating with the recess 15 is provided in the center of the top plate portion 16. The outer circumference of the top plate portion 16 is formed to be smaller than the inner circumference of the lid placement portion 33, and is formed to be large enough to be placed on the stepped portion 33b. In this embodiment, the top plate portion 16 is formed to be able to abut and be placed on the entire circumference of the upper surface of the stepped portion 33b.

[0027] The recess 15 has a hollow three-dimensional shape and is joined to the top plate portion 16 in a substantially liquid-tight manner at its upper end. In this embodiment, the pair of left and right side plates 15a constituting the recess 15 are formed in a substantially fan shape, are arranged facing each other and substantially parallel to one another, and are joined to the top plate portion 16 at their upper edges and to the pair of side plates 15a at both side edges. The back plate 15b, which is joined to the top plate portion 16 at its upper edge, has a curved inclined surface corresponding to the substantially fan shape of the side plates 15a, and the front plate 15c is arranged facing the back plate 15b at a distance from a part of it, and is joined to the pair of side plates 15a at both side edges and to the top plate portion 16 at its upper edge.

[0028] The lower edge of the back plate 15b and the lower edge of the front plate 15c are positioned vertically apart, and together with the side edges of the pair of side plates 15a, a through-hole 11a is formed that opens laterally. In this embodiment, when the lid device 10 is installed, the through-hole 11a is formed in a rectangular shape so that it opens diagonally upward. The peripheral edges of this rectangular through-hole 11a and through-hole 11a are formed with an incline suitable for the opening and closing operation of the flap valve 12, as will be described later.

[0029] The flap valve 12 has a rectangular shape corresponding to the through-hole 11a of the recess 15, and is formed to be larger than the through-hole 11a. This flap valve 12 can close the through-hole 11a by abutting against the periphery of the through-hole 11a. The flap valve 12 is pivotably mounted on its upper edge to a pivot 17 provided on the front plate 15c, which is on the outer side of the main body 11, and can open and close the through-hole 11a by swinging outward from the periphery of the through-hole 11a, which it is constantly in contact with. In this embodiment, the flap valve 12 is normally positioned with the through-hole 11a closed, and can swing outward within the inner cavity 32a of the edge block to open the through-hole 11a when water such as rainwater is flowing through.

[0030] In this embodiment of the present invention, a handle 13 is provided on the inner side of the flap valve 12 opposite to the direction of oscillation, that is, on the side facing the through-hole 11a of the recess 15. The handle 13 is provided at an intermediate position of the flap valve 12, protruding inward from the recess 15. In this embodiment, the handle 13 is provided at a position above the vertical center of the flap valve 12, for example, about 10 mm above the center. This is to ensure that the flap valve 12 opens and closes due to its own weight when the lid device 10 is installed.

[0031] The handle 13 has a curved shape that follows the back plate 15b of the main body 11, and can be grasped by an operator from the water intake port 16a of the main body 11. The handle 13 is also provided with a support hole 13a that can be supported by a tool, and the lid device 10 can be attached and detached using a tool inserted into the support hole 13a.

[0032] The handle 13 is configured to open and close the flap valve 12 and to support the main body 11 together with the flap valve 12. Here, the handle 13 is provided with sufficient strength to support the main body 11 together with the flap valve 12, preferably with sufficient strength to prevent damage, bending, or other deformation when supporting the weight of the entire lid device 10, including the flap valve 12 and the main body 11.

[0033] When the handle 13 is grasped or supported with a tool to support and lift the main body 11 and the flap valve 12, the flap valve 12, which is pivotably positioned on the outer side of the main body 11, can be pressurized in a direction that closes the through-hole 11a of the recess 15. Also, when the support hole 13a provided in the handle 13 is suspended and supported with a tool, the water intake port 16a of the main body 11 is kept facing upward. In this case, it is preferable that the support hole 13a is located above the center of gravity of the lid device 10 and on the axis of the center of gravity.

[0034] Furthermore, in the lid device 10 of this embodiment, the flap valve 12 having a handle 13 is pivotably fixed above the through-hole 11a of the recess 15, and is adjusted to close the through-hole 11a by its own weight. When closed, the space between the area around the through-hole 11a and the flap valve 12 is substantially closed.

[0035] On the other hand, the flap valve 12 having the handle 13 is adjusted in weight and weight balance so that it swings and displaces due to the weight of the water contained in the recess 15, opening the through-port 11a. Here, as the amount of water contained in the recess 15 increases, the degree to which the flap valve 12 with the handle 13 opens the through-port 11a can be adjusted to increase.

[0036] Road 35 generally slopes downward from the center towards the sidewalk edge, and since the lid device 10 is positioned with the through-hole 11a and flap valve 12 facing the center of the road, when installed at the edge of road 35, the through-hole 11a and its peripheral edge are facing diagonally upward.

[0037] Therefore, the flap valve 12, which is pivotally suspended from the pivot 17 above the through-hole 11a, can close the through-hole 11a by its own weight in sunny conditions. Because the flap valve 12 is pressed against the periphery of the through-hole 11a by its own weight, the flap valve 12 remains closed in sunny conditions, preventing the leakage of odors and the release of mosquitoes, etc. When rainwater flows into the recess 15 during rainfall, the weight of the incoming rainwater displaces the flap valve 12 against the pressure exerted by the flap valve's own weight, opening the through-hole 11a and allowing the rainwater in the recess 15 to drain out.

[0038] In the lid device 10 of this embodiment, as described above, the handle 13 is positioned not at the vertical center of the flap valve 12, but about 10 mm above the center. This eliminates the concern that the flap valve 12 may open due to the increased weight of the flap valve 12 caused by the handle 13, even when there is almost no slope in the through-hole 11a or when the flap valve 12 is installed facing the edge of the road 35 due to displacement of the edge block. In other words, it is possible to secure the load necessary to keep the flap valve 12 closed without changing the weight of the flap valve 12 itself.

[0039] To detachably attach such a sewer odor prevention device consisting of a lid device 10 to the edge block 32 of the opening 14 of the rainwater drain 30, the lid 34 of the rainwater drain 30 is opened as shown in Figure 3. Next, the operator grasps the handle 13 and inserts the lid device 10 into the lid placement section 33 of the opening 14. At this time, by gripping the handle 13 inside the recess 15 and supporting the entire lid device 10, the lid device 10 can be easily lifted with one hand and inserted into the lid placement section 33 while keeping the flap valve 12 closed.

[0040] In this state, the recess 15 of the main body 11 is inserted into the edge block cavity 32a together with the flap valve 12, and the flap valve 12 is positioned within the edge block cavity 32a to be able to open and close. Furthermore, the periphery of the top plate 16 is placed on the upper surface of the stepped portion 33b on the inner circumference of the through opening 33a of the lid placement portion 33. Then, the lid 34 is inserted into the lid placement section 33 and placed on the upper surface of the stepped section 33b, thereby clamping the periphery of the top plate section 16 between the lid placement section 33 and the lid 34, and the installation is completed.

[0041] In this state, with the sewer odor prevention device consisting of the lid device 10 attached to the rainwater catch basin 30, the through-hole 11a provided in the recess of the main body 11 is closed by the weight of the flap valve 12. In this state, the opening 14 of the rainwater catch basin 30 is blocked by the lid device 10.

[0042] In this state, if there is no rainwater or other water on the road surface or sidewalk surface, water will not normally flow into the rainwater catch basin 30. However, foreign objects such as garbage and fallen leaves may fall from the road surface or sidewalk surface through the water intake 34a of the lid 34. At this time, the opening 14 of the rainwater catch basin 30 is closed by the lid device 10 with the flap valve 12 closed, so the foreign objects such as garbage and fallen leaves that fall through the water intake 34a of the lid 34 accumulate inside this opening 14, preventing them from falling into the rainwater catch basin 30.

[0043] Furthermore, since the lid device 10 with the flap valve 12 closed closes the opening 14 of the rainwater catch basin 30, even if pests such as mosquitoes breed in the rainwater catch basin 30, they are prevented from being released to the outside of the lid 34 through the opening 14. In addition, since the lid device 10 with the flap valve 12 closed closes the opening 14 of the rainwater catch basin 30, odors inside the rainwater catch basin 30 are prevented from being released and leaking to the outside of the lid 34 through the opening 14.

[0044] On the other hand, when water is present on the road or sidewalk surface, such as during rainfall or watering, water from the road or sidewalk surface flows into the rainwater catch basin 30 through the intake port 34a of the lid 34, and this water flows into the recess 15 of the main body 11 of the lid device 10. Then, the flap valve 12 that closes the through-hole 11a of the recess 15 opens to a corresponding degree when the water in the recess 15 reaches a predetermined amount. As a result, the water that flows down from the intake port 34a of the lid 34 into the recess 15 flows down into the rainwater catch basin 30 through the through-hole 11a of the recess 15. Subsequently, when the water flowing down from the intake port 34a of the lid 34 stops, the flap valve 12 automatically closes the through port 11a, and that state is maintained.

[0045] When the lid device 10 is attached to the rainwater drain 30 and a certain period of time has passed, foreign objects such as garbage and fallen leaves that have fallen through the water intake 34a of the lid 34 accumulate in the recess 15 of the main body 11. Therefore, at an appropriate time, the foreign objects accumulated in the recess 15 of the lid device 10 will be removed and cleaned by an operator. In order to remove the foreign objects from the recess 15, the lid 34 must first be detached from the lid placement section 33 of the opening 14 of the rainwater drain 30 to expose the lid device 10.

[0046] In this state, as shown in Figure 4(a), the worker grasps the handle 13 protruding into the recess 15 of the lid device 10 and lifts the lid device 10 from the lid placement section 33. At this time, since the handle 13 is provided on the swingable flap valve 12, the handle 13 is pulled up in the direction that closes the flap valve 12, thereby supporting the lid device 10. As a result, the flap valve 12 is kept in a closed state, and the lid device 10 can be detached from the lid placement section 33 while foreign matter remains contained in the recess 15.

[0047] Then, as shown in Figure 4(b), by tilting the lid device 10 while holding the handle 13, foreign objects such as dirt and fallen leaves in the recess 15 can be removed from the recess 15. Subsequently, as shown in Figure 2, the lid device 10 can be reinstalled in the lid placement section 33, and the lid 34 can be placed on this lid placement section 33 to resume use of the lid device 10.

[0048] Next, the effects and advantages of the lid device 10 of this embodiment will be described. According to the lid device 10 of this embodiment, a flap valve 12 is provided that displaces outward from the main body 11 to open the through-hole 11a within the rainwater catch basin 30, which is a structure. A handle 13 is provided on the inside of the flap valve 12, which can support the main body 11 together with the flap valve 12. By supporting the lid device 10 with this handle 13, the supporting force can pressurize the flap valve 12 in the closing direction of the through-hole 11a.

[0049] Therefore, when attaching or detaching the lid device 10 to the opening 14 of the rainwater drain 30, supporting the lid device 10 with the handle 13 allows the flap valve 12 to hold the through-hole 11a closed. In other words, by supporting the lid device 10 with the handle 13 and performing the attachment or detachment of the lid device 10 to the opening 14 of the rainwater drain 30, the through-hole 11a can be easily held closed during the operation without providing a special structure or performing any special work to close the through-hole.

[0050] This prevents foreign objects such as garbage and fallen leaves from moving through the through-hole 11a when attaching or detaching the lid device 10 to the opening 14 of the rainwater drain 30, and prevents foreign objects that were previously prevented from entering the rainwater drain 30 by the lid device 10 from falling into the rainwater drain 30 through the through-hole 11a when attaching or detaching the lid device 10.

[0051] In the lid device 10 described above, the flap valve 12 is formed to be larger than the through-hole 11a and is pivotably mounted on the outer side of the main body 11 so as to close the entire through-hole. Therefore, the through-hole 11a can be easily opened and closed by the swinging of the flap valve 12, and when the lid device is supported by the handle 13, the area around the through-hole 11a is stably supported by the flap valve 12.

[0052] The lid device 10 described above is configured to be attached to the upward-facing opening 14 of the lid of the rainwater catch basin. The main body 11 of the lid device has a downward-facing recess 15, and a through-hole 11a is provided in the recess 15. Therefore, even if foreign objects such as garbage and fallen leaves that should be prevented from entering the rainwater catch basin 30 accumulate in the downward-facing recess 15, it is reliably prevented from entering the rainwater catch basin 30 through the through-hole 11a.

[0053] In the lid device 10 described above, the handle 13 is provided protruding inward from the recess 15. Therefore, even if foreign matter that is prevented from entering the rainwater drain 30 accumulates in the recess 15, the handle 13 is easy to support, and the lid device 10 can be easily attached and detached.

[0054] The lid device 10 described above is installed on the rainwater catch basin 30 as a structure, and the recess 15 is configured to allow rainwater and other water to flow in along with foreign matter. Therefore, the lid device 10 normally keeps the opening 14 closed, preventing foreign matter such as outdoor debris and fallen leaves from entering the rainwater catch basin 30. On the other hand, when rainwater flows into the lid device 10 during rainfall, the weight of the rainwater causes the flap valve 12 to swing and displace, creating a gap. This suppresses the entry of foreign matter into the rainwater catch basin 30, while allowing the incoming rainwater to flow down into the rainwater catch basin 30 through the through-hole 11a.

[0055] Furthermore, when detaching the lid device 10 from the opening 14 of the rainwater drain 30 during inspection or work, supporting the handle 13 while detaching it ensures that the flap valve 12 reliably closes the through-hole 11a while the lid device 10 is detached. Consequently, the lid device 10 can be detached from the opening 14 while retaining any foreign matter accumulated on the lid device 10 within the recess, preventing accumulated debris, fallen leaves, and other foreign matter from entering the rainwater drain 30.

[0056] In the lid device 10 described above, the through-hole 11a is opened laterally in the main body 11, and the flap valve 12 having a handle 13 is pivotally fixed above the through-hole 11a and closes the through-hole 11a by its own weight, and the degree of opening increases as the amount of water contained in the recess 15 increases. Therefore, by adjusting the position, shape, size, weight, etc. of the flap valve 12 having a handle 13, the lid device 10 can be opened and closed depending on whether it is raining or sprinkling water or not, and the amount of water such as rainwater flowing into the rainwater catch basin 30 can be automatically adjusted by the lid device 10.

[0057] The lid device 10 described above is substantially closed when the flap valve 12, which has a handle 13, is closed, thereby preventing mosquitoes that have formed in the rainwater drain 30 from being released to the outside. Thus, it is possible to prevent the transmission of mosquito-borne diseases such as dengue fever, chikungunya fever, Zika virus infection, Japanese encephalitis, West Nile fever, yellow fever, and malaria.

[0058] In this embodiment, since such a lid device 10 is used as an odor prevention device for sewage systems, the flap valve 12 can prevent odors from the rainwater catch basin 30 from being released to the outside, thereby improving the surrounding environment.

[0059] The above embodiments can be modified as appropriate within the scope of the present invention. For example, in the above embodiment, a rainwater drain 30 was used as an example of a structure, but the type and size of the structure are not limited in any way, and the present invention can be similarly applied to any member or structure, etc., for which it is preferable to prevent foreign matter from entering from the outside to the inside by the lid device 10. For example, the lid device 10 can be installed in the opening of various manholes. Furthermore, the foreign matter is not limited to garbage or fallen leaves; it can be any substance or object that you do not want to enter the interior of the structure through the opening and that can be prevented from entering by the flap valve. Therefore, the present invention is not limited to installation in rainwater drains, but can be installed in kitchen drains, for example, or can be applied to other uses, such as food containers, tools for selecting various substances and objects, as needed or at will.

[0060] Furthermore, the shape, position, structure, and other configurations of each part of the lid device 10 can be appropriately modified within the scope of the present invention. For example, in the above embodiment, the through-hole 11a of the lid device 10 is broadly provided in a rectangular shape on one side of the main body, and the flap valve 12 has a rectangular shape corresponding to the through-hole 11a and is provided so as to abut the surface of the recess 15 on the periphery of the through-hole 11a. However, the configuration is not limited in any way as long as the through-hole 11a can be opened and closed by the flap valve 12. The through-hole 11a and the flap valve 12 may have shapes other than rectangular, and they may have different shapes. Furthermore, the flap valve 12 may be configured to close the through-hole 11a by abutting a part other than the periphery. Furthermore, in the above embodiment, the handle 13 is provided in a curved shape that protrudes from the middle of the flap valve 12, but the position and shape of the handle 13 are not limited in any way as long as they can support the main body 11 and the flap valve 12 from the water intake 16a side of the main body 11. [Explanation of Symbols]

[0061] 10 Lid device 11 Main body 11a Through hole 12 Flap valve 13 Handle 13a Support hole 14 Opening 15 recesses 15a Side plate 15b Back plate 15c front plate 16 Top panel 16a Water intake 17 Pivot part 30 Rainwater catch basin 31 Connecting pipe 32 Marginal mass 32a Hollow inside the marginal mass 33 Lid arrangement part 33a Through opening 33b Stepped section 34 Lid 34a Water intake 35 Road 36 Sidewalk

Claims

1. A main body that is detachably attached to the opening of a structure so as to cover the opening, The through-hole provided in the main body, A lid device comprising a flap valve that displaces outward from the main body to open the through-hole, A handle is provided on the inner side of the flap valve, capable of supporting the main body together with the flap valve. A lid device that is detachably attached and detached by the handle, while pressurizing and holding the flap valve in the direction of closing the through-hole.

2. The lid device according to claim 1, wherein the flap valve is formed to be larger than the through-hole and is pivotably mounted on the outer side of the main body so as to close the through-hole.

3. It is configured to be attached to the upward-facing opening of the aforementioned structure, The lid device according to claim 1, wherein the main body portion has a recess that is indented downward, and the through-hole is provided in the recess.

4. The lid device according to claim 3, wherein the handle is provided protruding inward from the recess.

5. The lid device according to claim 3, wherein the structure is a rainwater drain, and water flows into the recess along with foreign matter such as garbage and fallen leaves.

6. The aforementioned through-hole is opened in the main body toward the side, The lid device according to claim 5, wherein the flap valve having the handle is pivoted above the through-hole and closes the through-hole by its own weight, and the degree of opening increases as the amount of water contained in the recess increases.

7. A sewer odor prevention device comprising the lid device according to claim 5 or 6.

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