JPH0510036Y2 - - Google Patents

Description

[Detailed explanation of the invention] Conventional technology Conventionally, manhole covers are provided with drainage holes.
It is designed to drain rainwater that collects on the top surface of the lid.

Problems to be Solved by the Invention When a manhole cover with such a drainage hole is installed in an urban area, sewage odor will be radiated to the ground through the hole, causing complaints from residents.

Therefore, an object of the present invention is to provide a manhole cover that does not emit odor and has a drainage function.

Means for Solving the Problems In order to achieve the above object, the structure of the manhole cover of the present invention is as follows. That is, a plurality of drain holes are provided through the central portion of the lid body, and below these drain holes, a water reservoir chamber is provided which is made up of a side wall extending vertically from the lid body and a bottom plate provided with an opening/closing means. The opening/closing means includes a rocking lever that supports the bottom plate on one side and is pivoted to the parallel ribs on the back side of the lid body so as to be able to swing freely in a vertical plane, and a swing lever that supports the bottom plate on one side and is pivoted to the parallel ribs on the back side of the lid body. and a weight member attached to the other side of the lever so that the bottom plate can swing downward when a certain weight is applied.

Function: Under normal conditions, the bottom plate contacts the lower surface of the side wall to maintain airtightness. When rainwater and dust on the lid enters the water reservoir chamber through the drain hole and accumulates in a certain amount, the weight of the rainwater and dust causes the bottom plate to swing downward, and the bottom plate is opened. As a result, the rainwater or dust is discharged into the manhole through the gap between the side wall and the bottom plate, and after being discharged, the bottom plate returns to its original state under the action of the weight member.

Embodiment The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, a manhole cover 20 is detachably attached to a receiving frame 10 which is annular in plan view via a hinge portion 1, and a water drain hole 24 and a water reservoir chamber 40 are formed in the center portion of the cover body 21.

In the hinge portion 1, the receiving frame 10 has a receiving frame main body 11 which is annular in plan view, and a hinge locking portion 12 provided inwardly protruding at one location on the inner periphery of the receiving frame main body. The receiving frame main body 11 has a flat top surface, and the receiving frame body 11 has the receiving step portion 11 inside.
a is formed. As shown in the second figure, the hinge locking portion 12 has a rectangular engagement hole 1 that is long in the radial direction of the receiving frame when viewed from above.
It has 2a.

The lid 20 has a circular plate-shaped lid main body 21 of a size that can be internally fitted into the receiving frame main body 11, and the main body is attached to the vertical surface with respect to the receiving frame 10 via the hinge locking portion 12 and the hinge 30. It is installed so that it can be opened and closed 180 degrees inside. A hinge mounting portion 22 having a hinge mounting hole 22a as shown in the third figure is vertically provided from one peripheral edge of the back side of the top plate portion of the lid body 21. The hinge mounting portion is surrounded by hanging walls on both sides in the circumferential direction of the lid and on three sides in the direction of the center of the lid, and a hinge mounting horizontal pin 23 is provided to penetrate the hanging walls on both sides in the circumferential direction.

As shown in the fourth figure, the hinge 30 includes a pivot portion 31, a hanging piece portion 32, and a hook portion 33 in order from the top. The horizontal pin 23 is inserted through the pivot portion 31, allowing the hinge 30 to swing in the radial direction of the lid 20. Further, the hook portion 33 is connected to the horizontal pin 2.
It has a length parallel to 3. Further, if the major axis dimension of the engagement hole 12a of the hinge locking part 12 is m and the minor axis dimension is n, then the relationship is set as m>>n.

Next, as shown in FIGS. 5 and 6, in the central part of the lid body 21, a plurality of pores (in the example 8) drain holes 24 are provided, and a water reservoir chamber 40 is formed below the drain holes 24 on the back side of the top plate portion of the lid body 21. The water reservoir chamber 40 is located inside the well rib 25, and the lid main body 2
a water reservoir side wall 26 hanging in an annular shape from the back surface of 1;
It consists of a bottom plate 41 equipped with an opening/closing means 50 that can be operated depending on the amount of water stored in the water storage chamber.

The bottom plate opening/closing means 50 includes a swinging lever 5 that supports the bottom plate 41 on one side and is swingable in a vertical plane.
1, a weight member 53 attached to the other side of the lever 51, and a pivot that is attached to the parallel rib 25 provided on the bottom surface of the lid body 21 and swingably supports the intermediate portion of the lever 51. It consists of a shaft 52.
The bottom plate 41 and the swing lever 51 are fixed to each other by a bottom plate-side fixing bolt 55, and the swing lever 51 and the weight member 52 are fixed to each other by a weight-side fixing bolt 56. And the bottom plate opening/closing means 5
0, the bottom plate 41 is in contact with the lower surface 26a of the side wall 26 to seal the bottom plate under normal conditions, but when a certain weight is applied to the bottom plate, the bottom plate 41 swings downward and the bottom plate 41 contacts the bottom surface 26a of the side wall 26. It is adjusted so that there is a gap between the two.

Here, the weight ratio between one side (bottom plate side) and the other side (weight side) is approximately 4:6 in the no-load state.
It is desirable that it be set to .

The bottom plate 41 is a synthetic resin plate with a smooth surface such as FRP or PVC, and is made of a material that is corrosion resistant and difficult to attract oil, fat, dirt, etc.

In the above, in order to assemble the lid 20 to the receiving frame 10, with the lid 20 standing approximately perpendicular to the ground, the length direction of the hook portion 33 and the long diameter direction of the engagement hole 12a are aligned, and the hinge 30 is Insert into the engagement hole 12a,
After the insertion is completed, the lid 20 is rotated 90 degrees around the vertical line, pulled down once toward the opposite side of the hinge, and then fitted into the receiving frame 10 while being pushed toward the hinge. The lid 20 is supported by the lid receiving stage portion 11a of the receiving frame main body 11 and is in a closed state.

The hinge 30 allows the lid 20 to move outward from the receiving frame within a vertical plane.
Even if it is rotated 180 degrees and released, the engagement hole 12a
Since the hook part 33 is caught on the rectangular part, it will not come off.

When rainwater or dust accumulates on the lid 20, it falls into the water storage chamber 40 through the drain hole 24. When a certain amount or more is accumulated in the room, the bottom plate 41 is loaded, the swing lever 51 is unbalanced, the bottom plate 41 swings downward, and becomes released, allowing the rainwater and dust to be drained from the gap through the manhole. Excrete inside. When these weighted substances on the bottom plate are discharged, the bottom plate 41 becomes lighter and returns to its original closed state. Therefore, the odor inside the manhole will not be radiated to the ground.

Even if pebbles or coarse dirt accumulates on the lid, drain hole 2
Since the hole 4 is widened downward, the hole will not be clogged. Pebbles and dust accumulated in the water storage chamber 40 are washed away together with the rainwater.

The water reservoir chamber 40 is formed by the parallel ribs 25 on the back side of the lid 20.
Since it is provided on the inside of the rib at a position lower than the rib, the bottom plate 41 and the lever 5 are provided even when the lid 20 is opened and closed.
1 is protected.

Effects of the Invention As described above, the present invention has a plurality of drainage holes penetrating through the central part of the lid body, and below these drainage holes, a side wall hanging down from the lid body and a bottom plate equipped with an opening/closing means. The opening/closing means includes a swing lever that supports a bottom plate on one side and is pivoted to a parallel rib on the back side of the lid body so as to be able to swing freely in a vertical plane, and a swing lever that supports the bottom plate on one side. and a weight member attached to the other side of the lever so that the bottom plate can swing downward when a certain weight is applied to the side wall. Therefore, even if rainwater or dust accumulates on the lid, it will flow through the drain hole to the water storage chamber, and if a certain amount or more of rainwater or the like accumulates in the chamber, it will be automatically discharged into the manhole. Therefore, rainwater and dust accumulated on the lid can be easily discharged. Moreover, since the bottom plate is sealed in contact with the side wall of the water reservoir at all times other than when the water is being discharged, the odor inside the manhole is not radiated to the ground.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the main parts of the receiving frame, Fig. 3 is an enlarged bottom view of the main parts of the lid, Fig. 4 is an enlarged side view of the hinge, Fifth
The figure is an enlarged longitudinal cross-sectional view of the water drain section, and FIG. 6 is a bottom view thereof. 10... Receiving frame, 12... Hinge locking part, 12a
...Engagement hole, 20...Lid, 22...Hinge mounting portion, 26...Water reservoir side wall, 30...Hinge, 40...
... Water reservoir chamber, 41 ... Bottom plate, 50 ... Bottom plate opening/closing means, 51 ... Rocking lever, 53 ... Weight member.

Claims (1)

[Scope of utility model registration request] Multiple drainage holes are installed in the center of the lid body,
Below these drainage holes, a water reservoir chamber is provided, which is made up of a side wall extending vertically from the lid body and a bottom plate equipped with an opening/closing means, the opening/closing means supporting the bottom plate on one side and swinging in a vertical plane. A rocking lever is movably supported on the parallel ribs on the back of the lid main body, and the bottom plate is brought into close contact with the side wall under normal conditions, and the bottom plate can swing downward when a certain weight is applied to the bottom plate. and a weight member attached to the other side of the lever.