JP2012172322A - Pressure release lid for drainage line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure release lid for a drainage line, capable of surely releasing a pressure even when the rise of a pressure inside the drainage line is relatively small, restoring an original state even when sand or soil or the like intrudes when releasing the pressure, and preventing infiltration of rainwater.SOLUTION: The pressure release lid for a drainage line includes: a lid body 4 fitted inside a lid frame and provided with a through-hole 5 passing through in the vertical direction; a movable opening/closing lid 6 movable in the vertical direction between a lower limit position at which it closes the through-hole 5 and an upper limit position at which it floats from the lid body 4 and opens the through-hole 5; a guide part 7 for regulating the moving direction in the vertical direction; and annular packing 8 mounted on an outer peripheral surface of the movable opening/closing lid 6 to block infiltration of rainwater to the through-hole 5. Particularly, an inner peripheral surface of the through-hole 5 has a tapered inclined inner peripheral surface 17 for reducing an opening area more on the lower side, the movable opening/closing lid 6 is provided with an inclined outer peripheral surface 19 matched with the inclined inner peripheral surface 17, and the packing 8 is disposed at a position to be in press contact with the inclined inner peripheral surface 17 of the through-hole 5.

Description

  The present invention relates to a pressure relief cover for drainage pipes, and in particular, a pressure relief cover for drainage pipes that is attached to the upper end opening of a vertical pipe such as a drainage pipe or manhole and can release the pressure in the drainage pipes. It is about.

  As shown in FIG. 3, a drainage pipe 51 (branch pipe) is connected to each facility 50 such as a sink and a bathtub in a house, and this drainage pipe 51 and a drainage main pipe buried in the ground. A drainage basin 53 is installed at a connection location with 52. A drain pipe 53 is provided with a cleaning pipe 54 extending to the ground surface, and an upper end opening thereof is closed by a cleaning lid 55. The cleaning lid 55 is generally composed of a cylindrical lid frame 56 fixed to the upper end portion of the cleaning tube 54 and a disc-shaped lid body 57 detachably fitted in the lid frame 56.

  By the way, the lid main body 57 is fitted in a state of being in close contact with the lid frame 56 so that rainwater does not enter the cleaning tube 54. For this reason, for example, when a large amount of rainwater flows into the drainage main pipe 52 due to concentrated heavy rain, the pressure (internal pressure) in the drainage basin 53 and the drainage pipe line 51 becomes excessive due to the pressure generated from the drainage main pipe 52 side. As a result, the drainage basin 53 and the drainage pipe 51 may be damaged, or the sealed water of each facility 50 in the house may be scattered.

  As a cleaning lid for solving this problem, a pressure release lid 60 shown in FIG. 4A has been proposed (see Patent Document 1). The pressure release lid 60 includes a disc-like lid body 61 and a cylindrical lid frame 62. The lid body 61 includes a guide member 64 suspended from the back surface and a lock that restricts the vertical movement of the lid body 61. The cover frame 62 includes a receiving portion 66 that detachably supports the cover body 61 and an annular protrusion 67 that can be engaged with the hook portion 65a of the lock member 65. Yes. When the lid 61 is attached to the lid frame 62, that is, when the opening 62 a of the lid frame 62 is closed, the hook portion 65 a of the lock member 65 is arranged to be spaced below the protrusion 67. ing. According to this, when an excessive pressure is applied to the lower surface of the lid body 61, the lid body 61 is pushed up until the hook portion 65a of the lock member 65 and the projection portion 67 are engaged (the state shown in FIG. 4A). ), The pressure can be released through the opening 62 a of the lid frame 62. Further, by providing the lock member 65 and the protruding portion 67, the lid body 61 is prevented from being detached from the lid frame 62 even if the lid body 61 is largely pushed up as the internal pressure increases.

  Moreover, what is shown in FIG.4 (b) is proposed as another cleaning lid (refer patent document 2). The pressure release lid 70 has a substantially cylindrical lid frame 71, a lid body 73 having a plurality of through holes 72 that are detachably fitted in the lid frame 71 and penetrates in the vertical direction, and an upper surface of the lid body 73. It is comprised from the cover member 74 which overlaps and closes the several through-hole 72. As shown in FIG. Further, the cover member 74 is supported in a state in which the cover member 74 can move in the vertical direction by a support member 75 disposed at the center, and the upper limit position thereof is restricted. According to this, when the internal pressure in the drainage basin 53 becomes high, pressure is applied to the cover member 74 through the through hole 72, and the through hole 72 is opened by pushing up the cover member 74, so that the pressure can be released. It has become. Further, when the internal pressure is reduced, the covering member 74 is lowered by its own weight, and the through hole 72 is naturally closed.

  However, according to the pressure release lid 60 shown in FIG. 4 (a), the lid 61 itself is pushed up by the internal pressure, so that the weight of the movable part becomes large. For example, when the rise in the internal pressure is relatively small It is difficult to push up the lid 61 or the movement of the lid 61 is unstable.

  In addition, when an obstacle is installed in the vicinity of the pressure release lid 60 and the obstacle is placed on the upper surface of the lid 61, the lid 61 cannot be pushed up. As a result, it could no longer function as a pressure release lid.

  Further, when the lid 61 is removed from the lid frame 62 for cleaning and maintenance of the drainage basin 53, the engagement state by the lock member 65 is released, specifically, the lock member 65 is rotated. Was necessary and workability was poor.

  Further, the lid frame 62 of the pressure release lid 60 is formed with a receiving portion 66 that detachably receives the lid 61. Since the receiving portion 66 is formed in a horizontal plane, for example, When an inflow such as sand, earth, or dust enters the lid frame 62 when the lid 61 is pushed up, the inflow tends to remain on the receiving port 66. And when inflow material remains between the cover body 61 and the receiving part 66, it becomes impossible to return the cover body 61 to an original shape, and rainwater easily enters from the periphery of the cover body 61. There was a problem. Furthermore, periodic cleaning of the pressure release lid 60 is required, and the burden for maintenance has also increased.

  On the other hand, according to the pressure release lid 70 shown in FIG. 4B, the covering member 74 for closing the through hole 72 of the lid main body 73 is superimposed on the upper surface of the lid main body 73, and the upper surface of the lid main body 73 is When the cover member 74 is pushed up when the cover member 74 is pushed up, if an inflow material such as sand, earth, or dust enters between the cover body 73 and the cover member 74, other than the through hole 72 on the cover body 73. The inflow was likely to remain on the flat part of. And when the inflow remained, the covering member 74 could not be returned to the original state.

  Further, according to the pressure release lid 70, the covering member 74 is overlapped on the upper surface of the lid main body 73, so that a pedestrian easily hits the covering member 74. In particular, when the inflow enters between the lid main body 73 and the cover member 74, the cover member 74 remains largely protruded, and the ease of spreading is promoted.

  Therefore, in view of the above situation, the present invention can surely release the pressure even when the pressure increase in the drainage pipe is relatively small, and sand or earth can enter when the pressure is released. However, it is an object of the present invention to provide a pressure relief cover for a drainage pipe that can be restored to its original state and prevented from entering rainwater.

The pressure relief lid for the drain line according to the present invention is:
“A pressure relief lid for drainage pipes attached to the upper end opening of a vertical pipe connected to the underground drainage pipe and extending upward,
A frame-like lid frame;
A lid body detachably fitted in the lid frame and provided with a through-hole penetrating in the vertical direction;
A movable open / close lid that is vertically movable between a lower limit position that is inserted into the through hole of the lid body and closes the through hole, and an upper limit position that floats from the lid body and opens the through hole;
A guide unit that hangs down from the lower surface of the movable open / close lid and regulates the moving direction of the movable open / close lid in the vertical direction;
An annular packing that is attached to the outer peripheral surface of the movable open / close lid and contacts the lid main body when the movable open / close lid moves to the lower limit position, and prevents rainwater from entering the through hole;
The inner peripheral surface of the through hole has a tapered inclined inner peripheral surface with a smaller opening area toward the lower side,
The movable opening / closing lid has an inclined outer peripheral surface that matches the inclined inner peripheral surface of the through-hole,
The packing is disposed at a position where it can contact the inclined inner peripheral surface of the through-hole. ''
It is characterized by this.

  Here, “standpipe” includes a drainage basin and a manhole. Moreover, it is preferable that the height of the upper surface of the “lid body” matches the height of the upper surface of the lid frame so as not to protrude from the lid frame. For the same reason, when the “movable open / close lid” is at the lower limit position, it is preferable to match the height of the upper surface of the movable open / close lid with the height of the upper surface of the lid body.

  In addition, the position of the “through hole” in the lid body is not particularly limited, but even when other obstacles protrude from the lid body, they are placed in the center of the lid body that is least susceptible to the influence. It is preferable to provide it. Examples of the “annular packing” include an O-ring having a circular cross section, a flat packing having a rectangular cross section, and the like.

  According to the pressure relief lid for drainage pipe of the present invention, the lid body fitted into the lid frame is provided with a through hole penetrating in the vertical direction, and a movable opening / closing lid is fitted into the through hole. Yes. A guide portion is suspended from the lower surface of the movable opening / closing lid, and the movable opening / closing lid is guided in the vertical direction between the lower limit position and the upper limit position by bringing the guide portion into sliding contact with the peripheral surface of the through hole. The When the movable opening / closing lid moves to the lower limit position, the movable opening / closing lid is fitted into the through hole of the lid body and closes the through hole. On the other hand, when the movable opening / closing lid moves toward the upper limit position, the movable opening / closing lid floats from the lid body and opens the through hole.

  More specifically, when the pressure in the drain pipe or the vertical pipe (hereinafter referred to as “internal pressure”) is low, the movable open / close lid is held at the lower limit position, and the upper end opening of the vertical pipe is opened in cooperation with the lid body. Close. An annular packing is attached to the outer peripheral surface of the movable opening / closing lid, and when the movable opening / closing lid moves to the lower limit position, the packing contacts the inner peripheral surface of the through hole of the lid body. Therefore, the outer peripheral surface of the movable opening / closing lid and the inner peripheral surface of the through hole are brought into close contact with each other through the packing, and the intrusion of rainwater into the through hole is prevented. On the other hand, when the internal pressure increases, pressure is applied to the lower surface of the movable opening / closing lid, and the movable opening / closing lid is pushed up toward the upper limit position. As a result, the outer peripheral surface of the movable opening / closing lid and the packing are separated from the inner peripheral surface of the through hole, and the pressure in the drain pipe and the standing pipe is released. When the internal pressure is reduced by releasing the pressure, the force for pushing up the movable opening / closing lid disappears, so that the movable opening / closing lid naturally falls by its own weight and returns to the lower limit position (ie, the original position).

  By the way, the inner peripheral surface of the through hole is a tapered inclined inner peripheral surface whose opening area becomes smaller toward the lower side, and the outer peripheral surface of the movable opening / closing lid is an inclined outer peripheral surface that matches the inclined inner peripheral surface of the through hole. It is a surface. Therefore, at the lower limit position, the movable opening / closing lid can be held only by the inner peripheral surface of the through hole, and when the movable opening / closing lid returns toward the original shape, the inner peripheral surface of the through hole (that is, the inclined inner periphery) Since the outer peripheral surface (that is, the inclined outer peripheral surface) of the movable opening / closing lid is fitted into the surface), the inner peripheral surface and the outer peripheral surface can be smoothly and easily matched. In addition, since the portion of the lid body that receives the movable opening / closing lid is a tapered inclined inner peripheral surface, even if an inflow material such as sand, earth, or dust enters, the inflow material is in the inclined inner periphery. It flows down into the through-hole along the inclination of the surface and does not remain on the inclined inner peripheral surface, that is, between the movable opening / closing lid and the lid body. Therefore, the movable opening / closing lid can be reliably returned to the lower limit position.

  The packing attached to the outer peripheral surface of the movable opening / closing lid contacts the inclined inner peripheral surface of the through hole when the movable opening / closing lid moves to the lower limit position. It is possible to maintain the watertight state. In addition, when the internal pressure is increased and an upward force is applied to the movable opening / closing lid, the packing comes into sliding contact along the inclined inner peripheral surface, but the opening area of the inclined inner peripheral surface increases toward the upper side. The frictional force against the packing is reduced. Therefore, the sliding resistance due to the packing can be suppressed to a small value, and as a result, the movable open / close lid can be easily pushed up even when the increase in internal pressure is relatively small.

Moreover, in the pressure release lid for the drain pipe of the present invention,
"The movable opening / closing lid further has an annular groove formed on the inclined outer peripheral surface,
The packing is housed in the groove and is disposed in a state where a part protrudes outside the groove. ''
It can be configured.

  According to this, the annular groove is formed on the inclined outer peripheral surface of the movable opening / closing lid, and the annular packing is accommodated in the groove. Further, a part of the packing protrudes outside the groove portion, and the protruding portion comes into contact with the inclined inner peripheral surface of the through hole in the lid body. For this reason, when the movable opening / closing lid moves to the lower limit position, even if sliding resistance occurs between the packing and the inclined inner peripheral surface, the packing does not shift with respect to the inclined outer peripheral surface of the movable opening / closing lid. Become. Further, since only a part of the packing (the protruding portion) protrudes outward from the inclined outer peripheral surface, the gap between the inclined outer peripheral surface of the movable opening / closing lid and the inclined inner peripheral surface of the through hole should be reduced as much as possible. Can do.

In the pressure relief lid for the drain pipe of the present invention,
"The guide section
A plurality of legs that are suspended from the peripheral edge of the lower surface of the movable opening / closing lid, are arranged at predetermined intervals in the circumferential direction, and are elastically deformed inward with the upper end as a fulcrum;
It is formed to project outward from the lower end of each leg part, and when the movable opening / closing lid moves to the upper limit position, it is locked to the lower surface of the lid main body to prevent the upward movement of the movable opening / closing lid. With locking claws ”
It can be configured.

  Here, the number of the “leg portions” is not particularly limited, but by setting the number of the “leg portions” to three or more, the movable opening / closing lid can be stably supported.

  According to this, the guide part that regulates the moving direction of the movable opening / closing lid is constituted by a plurality of legs that hang from the peripheral edge of the lower surface of the movable opening / closing lid and are arranged at predetermined intervals in the circumferential direction. When the movable opening / closing lid floats from the lid body, the pressure can be released through the space between the legs. In particular, the area of this space, that is, the open area, increases as the push-up position of the movable opening / closing lid increases. In other words, when the increase in internal pressure is relatively small, the open area is small, and as the increase in internal pressure is large, the open area becomes large. Therefore, even when the increase in internal pressure is relatively small, the movable opening / closing lid can be pushed up reliably. On the other hand, even when the increase in internal pressure is large, the movable opening / closing lid is prevented from being applied with extremely large pressure, and the movable opening / closing lid is destroyed. Etc. can be prevented.

  Further, a locking claw portion is provided at the lower end of each leg portion, and is locked to the lower surface of the lid body when the movable opening / closing lid moves to the upper limit position. Therefore, even when the movable open / close lid is pushed up largely, it is possible to prevent the movable open / close lid from being detached from the lid main body. Since each leg portion can be elastically deformed inward with the upper end as a fulcrum, the leg portion is deformed inward so that the locking claw portion is pulled out without being locked to the lower surface of the lid body. It becomes possible. That is, even when the movable opening / closing lid is replaced or the through-hole of the lid body is cleaned, it can be easily performed without placing a burden on the operator.

  Thus, according to the present invention, the pressure can be reliably released even when the pressure increase in the drain pipe is relatively small. Moreover, even if sand or earth enters when the pressure is released, the movable open / close lid can be restored to its original shape, and rainwater can be reliably prevented from entering.

It is a disassembled perspective view which shows the structure of the pressure release lid | cover for drain pipes of this embodiment. It is sectional drawing which shows operation | movement of the pressure release lid | cover for drainage pipes, (a) shows the state in which a movable open / close lid is a lower limit position, (b) shows the state in which a movable open / close lid is an upper limit position. It is a schematic diagram showing the whole drainage system composition. (A) is sectional drawing which shows the conventional pressure release lid | cover, (b) is sectional drawing which shows the other conventional pressure release lid | cover.

  Hereinafter, a pressure relief lid 1 for drainage pipes (hereinafter referred to as “pressure relief lid 1”) according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The pressure release lid 1 is attached to the upper end opening of the cleaning tube 54 (see FIG. 3), the lid frame 2 (not shown in FIG. 1) fixed to the upper end opening of the cleaning tube 54, and the lid frame 2 A lid body 4 that is detachably fitted in the opening 3, a packing 9 (not shown in FIG. 1) that is attached to the outer peripheral surface of the lid body 4, and a through-hole 5 provided in the center of the lid body 4. A movable opening / closing lid 6 to be inserted and inserted, a guide portion 7 suspended from the movable opening / closing lid 6, and a packing 8 attached to the outer peripheral surface of the movable opening / closing lid 6 are configured. Hereinafter, each configuration will be described in detail. Here, the cleaning pipe 54 corresponds to a standing pipe of the present invention.

  The lid frame 2 is a synthetic resin member having a substantially cylindrical shape, and a thick portion 10 projecting outward is formed on an upper portion thereof. In addition, at the upper end of the inner peripheral surface of the lid frame 2, a receiving portion 11 is formed that supports the disc portion 13 (described later) of the lid body 4 while being accommodated. The lid frame 2 is attached such that the height of the upper surface coincides with the ground surface A (see FIG. 3).

  The lid body 4 is made of synthetic resin, like the lid frame 2, and includes a disk-shaped disk portion 13 and a substantially cylindrical hanging cylinder portion 14 that is suspended downward from the bottom surface of the disk portion 13. I have. The thickness of the disc portion 13 is equal to the depth of the receiving portion 11 in the lid frame 2, and when the lid main body 4 is fitted into the receiving portion 11 of the lid frame 2, the thickness of the upper surface of the lid main body 4 is high. Is equal to the height of the upper surface of the lid frame 2. A through-hole 5 that penetrates in the vertical direction is provided at the center of the lid body 4. The inner peripheral surface of the through-hole 5 is a tapered inclined inner peripheral surface 17 whose opening area decreases toward the lower side. The angle of inclination of the inclined inner peripheral surface 17 is not particularly limited, but is preferably 30 ° to 60 °, and most preferably 45 °. This is because when the inclination angle is larger than 60 ° (ie, near vertical), the difference between the opening area on the upper side and the opening area on the lower side in the through hole 5 becomes small, and the inner circumference of the through hole 5 becomes smaller. This is because if the movable opening / closing lid 6 is supported by the surface, the degree of freedom in fitting the through hole 5 and the movable opening / closing lid 6 is lost, and it becomes difficult to naturally return the movable opening / closing lid 6. In addition, when the inclination angle is smaller than 30 °, when dirt, sand, dust or the like flows into the inclined inner peripheral surface 17, there is a possibility that it remains without sliding down. Note that only the lower end portion of the inner peripheral surface of the through-hole 5 is a vertical inner peripheral surface 18, and a sliding contact surface with a leg portion 24 described later is secured by the vertical inner peripheral surface 18.

  The movable opening / closing lid 6 is made of a synthetic resin, like the lid body 4, and has a substantially disc shape. The thickness of the movable opening / closing lid 6 is substantially the same as the disc portion 13 in the lid body 4, and the height of the upper surface of the movable opening / closing lid 6 is the same as that of the lid body 4 in a state of being inserted into the through hole 5 of the lid body 4. It corresponds to the height of the upper surface. That is, the upper surfaces of the lid frame 2, the lid body 4, and the movable opening / closing lid 6 are flat surfaces that are continuous with each other and are arranged without protruding from the ground surface A.

  The outer peripheral surface of the movable open / close lid 6 is formed with an inclined outer peripheral surface 19 whose cross-sectional area decreases toward the lower side. When the movable open / close lid 6 is fitted into the through hole 5, the entire inclined outer peripheral surface 19 penetrates. It is configured to match the inclined inner peripheral surface 17 of the hole 5. Note that an annular groove 20 is formed on the inclined outer peripheral surface 19 of the movable opening / closing lid 6 and the packing 8 is housed in a partially protruding state, so that the inclined inner peripheral surface 17 and the inclined outer peripheral surface 19 A slight gap is formed between them.

  The guide portion 7 regulates the moving direction of the movable opening / closing lid 6 in the vertical direction, and is suspended from the peripheral portion of the lower surface 22 of the movable opening / closing lid 6 and has three legs arranged at intervals of 120 degrees in the circumferential direction. The unit 24 is provided. Each leg 24 is a rod-shaped member, and moves in the vertical direction while keeping the movable open / close lid 6 horizontal by slidingly contacting the vertical inner peripheral surface 18 of the through hole 5 in the lid body 4 from the inside. It is possible to make it. Further, a locking claw portion 25 protruding outward is formed at the lower end of the leg portion 24, and when the movable opening / closing lid 6 moves upward, it is movable by being locked to the lower surface of the lid body 4. The upper limit position of the opening / closing lid 6 is regulated. The respective leg portions 24 are spaced apart from each other, and the leg portions 24 are elastically deformable with the upper end as a fulcrum, so that the three leg portions 24 are simultaneously deformed inwardly to be locked. The engagement state of the claw portion 25 is released, and the movable opening / closing lid 6 and the guide portion 7 can be detached from the lid body 4.

  Next, the operation of the pressure release lid 1 of the present embodiment will be described based on FIG. When the internal pressure of the drainage basin 53 (see FIG. 3) is low (normal case), the movable opening / closing lid 6 is positioned at the lower limit position as shown in FIG. At the lower limit position, the movable opening / closing lid 6 is received by the inclined inner peripheral surface 17 of the through hole 5 in the lid body 4 and closes the through hole 5. An annular packing 8 is mounted on the outer peripheral surface (inclined outer peripheral surface 19) of the movable opening / closing lid 6, and the packing 8 contacts the inclined inner peripheral surface 17 of the through hole 5 at the lower limit position. Thereby, the inclined outer peripheral surface 19 of the movable opening / closing lid 6 and the inclined inner peripheral surface 17 of the through hole 5 are brought into close contact with each other via the packing 8.

  On the other hand, when the internal pressure of the drainage basin 53 is increased, pressure is applied to the lower surface of the movable opening / closing lid 6 and the movable opening / closing lid 6 is pushed up toward the upper limit position (see FIG. 2B). Since the three leg portions 24 are arranged at equal intervals on the lower surface of the movable opening / closing lid 6, the leg portions 24 are slid on the vertical inner peripheral surface 18 of the through hole 5. By touching, it is pushed straight up while maintaining a horizontal state. When the movable opening / closing lid 6 floats from the lid body 4, the inclined outer peripheral surface 19 and the packing 8 of the movable opening / closing lid 6 are separated from the inclined inner peripheral surface 17 of the through hole 5, and pressure is applied through the space S between the leg portions 24. Is released. In addition, since the latching claw part 25 is provided in the lower end of each leg part 24, if the movable opening / closing lid | cover 6 moves to an upper limit position, the latching claw part 25 will be latched by the lower surface of the lid body 4, The movable opening / closing lid 6 is prevented from being detached from the lid body 4.

  In addition, the area of the space S, that is, the open area, increases as the push-up position of the movable opening / closing lid 6 increases. In other words, when the increase in internal pressure is relatively small, the open area is small, and as the increase in internal pressure is large, the open area becomes large. Therefore, even when the increase in the internal pressure is relatively small, the movable opening / closing lid 6 can be pushed up reliably. On the other hand, even when the increase in the internal pressure is large, the movable opening / closing lid 6 is prevented from being applied with a very large pressure. 6 can be prevented.

  When the internal pressure decreases due to the release of the pressure, the force for pushing up the movable opening / closing lid 6 disappears, so that the movable opening / closing lid 6 naturally descends due to its own weight and returns to the lower limit position (that is, the original position).

  As described above, according to the pressure release lid 1 of the present example, the only part that is pushed up by the internal pressure is the movable opening / closing lid 6 and the guide 7 that are fitted into the through hole 5 of the lid body 4. Reduces weight. Further, even when an obstacle is installed in the vicinity of the lid body 4 and the obstacle is placed on the top surface of the lid body 4, the movable opening / closing lid 6 is arranged at the center of the lid body 4. Therefore, it is not easily affected by obstacles. Further, since the packing 8 is in contact with the inclined inner peripheral surface 17 of the through hole 5, the sliding resistance due to the packing 8 is reduced. Further, when the increase in the internal pressure is small, the movable open / close lid 6 does not rise so much and the area of the space S where the pressure is released becomes small. For the reasons described above, according to the pressure release lid 1 of this example, even when the increase in internal pressure is relatively small, the movable opening / closing lid 6 can be reliably pushed up to release the pressure.

  Further, according to the pressure release lid 1 of the present example, when the movable opening / closing lid 6 is pushed up, an inflow such as sand, earth, or dust enters between the movable opening / closing lid 6 and the lid body 4. Even if there is, the inflow flows down into the through hole 5 along the inclination of the inclined inner peripheral surface 17, and does not remain on the inclined inner peripheral surface 17, that is, at the joint portion between the movable opening / closing lid 6 and the lid body 4. It becomes like this. Further, since the movable opening / closing lid 6 is guided by the legs 24, it can be lowered straight after the pressure is released. Further, since the inclined outer peripheral surface 19 of the movable opening / closing lid 6 is inserted into the inclined inner peripheral surface 17 of the through hole 5, the movable opening / closing lid 6 can be smoothly and easily inserted into the through hole 5. it can. Furthermore, since the inner peripheral surface with which the packing 8 contacts is the tapered inclined inner peripheral surface 17, the packing 8 can be brought into pressure contact with the inclined inner peripheral surface 17 by the weight of the movable opening / closing lid 6. For the above reasons, in the pressure release lid 1 of this example, the movable opening / closing lid 6 can be reliably returned to the lower limit position.

  Further, according to the pressure release lid 1 of this example, since the packing 8 is accommodated in the annular groove portion 20, it can be supported so that the packing does not shift with respect to the inclined outer peripheral surface 19 of the movable opening / closing lid 6. . Further, since only a part (the protruding part) of the packing 8 protrudes outward from the inclined outer peripheral surface 19, the inclined outer peripheral surface 19 of the movable opening / closing lid 6 and the inclined inner peripheral surface 17 of the through hole 5 The gap can be reduced as much as possible.

  Furthermore, according to the pressure release lid 1 of this example, the movable opening / closing lid 6 and the guide portion 7 can be detached from the lid body 4 by deforming the three leg portions 24 inward, so Even when the lid 6 is replaced or the through-hole 5 of the lid body 4 is cleaned, it can be easily performed without placing a burden on the operator.

  The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements can be made without departing from the scope of the present invention as described below. And design changes are possible.

  That is, in the above-described embodiment, the vertical inner peripheral surface 18 for sliding the guide portion 7 is formed at the lower portion of the inner peripheral surface of the through hole 5, but the vertical inner peripheral surface 18 is not formed. The entire inner peripheral surface of the through hole 5 may be inclined.

  In the above embodiment, the lid body 4 is provided with only one through hole 5. However, a plurality of through holes may be provided, and a movable opening / closing lid may be inserted into each through hole. .

  Furthermore, in the said embodiment, although what was comprised from the disc part 13 and the drooping cylinder part 14 was shown as the lid body 4, in order to raise an intensity | strength, it is a grid | lattice-like or radial reinforcement inside the drooping cylinder part 14. A portion (not shown) may be provided. In this case, the reinforcing portion may be provided horizontally through the lower portion of the through hole 5.

DESCRIPTION OF SYMBOLS 1 Pressure release lid | cover for drainage pipes 2 Lid frame 4 Lid body 5 Through-hole 6 Movable opening / closing lid 7 Guide part 8 Packing 17 Inclined inner peripheral surface 19 Inclined outer peripheral surface 20 Groove part 22 Lower surface 24 Leg part 25 Locking claw part 52 Drainage book Pipe (drainage pipe)
54 Cleaning pipe (standing pipe)

JP 2007-321535 A Japanese Utility Model Publication No. 6-20585

Claims (3)

A drainage line pressure release lid attached to the upper end opening of a vertical pipe connected to the underground drainage pipe and extending upward,
A frame-like lid frame;
A lid body detachably fitted in the lid frame and provided with a through-hole penetrating in the vertical direction;
A movable open / close lid that is vertically movable between a lower limit position that is inserted into the through hole of the lid body and closes the through hole, and an upper limit position that floats from the lid body and opens the through hole;
A guide unit that hangs down from the lower surface of the movable open / close lid and regulates the moving direction of the movable open / close lid in the vertical direction;
An annular packing that is attached to the outer peripheral surface of the movable open / close lid and contacts the lid main body when the movable open / close lid moves to the lower limit position, and prevents rainwater from entering the through hole;
The inner peripheral surface of the through hole has a tapered inclined inner peripheral surface with a smaller opening area toward the lower side,
The movable opening / closing lid has an inclined outer peripheral surface that matches the inclined inner peripheral surface of the through-hole,
The pressure relief cover for drainage pipes, wherein the packing is disposed at a position that can contact the inclined inner peripheral surface of the through hole. The movable opening / closing lid further has an annular groove formed on the inclined outer peripheral surface,
2. The drain line pressure release lid according to claim 1, wherein the packing is accommodated in the groove part and is disposed in a state in which a part protrudes outside the groove part. The guide part is
A plurality of legs that are suspended from the peripheral edge of the lower surface of the movable opening / closing lid, are arranged at predetermined intervals in the circumferential direction, and are elastically deformed inward with the upper end as a fulcrum;
It is formed to project outward from the lower end of each leg part, and when the movable opening / closing lid moves to the upper limit position, it is locked to the lower surface of the lid main body to prevent the upward movement of the movable opening / closing lid. The drainage pipe pressure release lid according to claim 1, further comprising a locking claw portion.

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