JPS625094Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention was developed to create an internal pressure relief system that will not be damaged even if a car or other vehicle runs on the top of the manhole cover when a large amount of rainwater flows into the sewer in a short period of time and pushes up the cover of the manhole cover to release the internal pressure. Provides a manhole cover with a mechanism.

In conventional manhole covers with an internal pressure relief mechanism, when a large amount of rainwater flows into the sewer, the cover of the manhole cover can be pushed up a certain distance by water pressure, and the pushed-up cover and A stream of water was ejected from between it and the receiving frame and released onto the road surface. However, there is a drawback that if a vehicle or the like drives on the top surface of the lid while the lid is pushed up, the connecting means connecting the lid and the receiving frame will be damaged.

Therefore, in the present invention, a receiving frame, a lid fitted to the receiving frame, a hinge shelf protruding from the inner circumferential surface of the receiving frame and provided with a hinge through hole, and reinforcing members for the hinge shelf disposed on both sides of the shelf and the inner circumferential surface of the receiving frame; and an engaging protrusion loosely provided in the hinge through hole of the hinge shelf and disposed at the lower end; is rotatably connected to the back of the lid, and the hinge is placed at a position of 120° with respect to the hinge connecting metal, so that the lid can be pushed up a certain distance relative to the receiving frame. Since the manhole cover is equipped with an internal pressure relief mechanism consisting of a connecting means and an internal pressure relief mechanism, even if a tire of a car or other vehicle rides on the hinge connecting fitting of the lid that is pushed up by water pressure, the hinge shelf will not be removed. It is possible to provide a manhole cover with an internal pressure relief mechanism that will not be damaged.

An embodiment of this invention will be described based on the drawings. First of all, referring to FIG. 1, a manhole cover 1 installed on a road surface is arranged by fitting an inclined outer circumferential surface 3a of a cover part 3 into an inclined inner circumferential surface 2a of a receiving frame 2, and a manhole cover 1 installed on a road surface. A hinge shelf 4 is protruded from the inner circumferential surface of the receiving frame 2 in order to connect the lid part 3 with the hinge, and the hinge shelf 4 is provided with a long hinge hole 15 in the diametrical direction. Side plates 4a and 4b are vertically arranged on both sides of the hinge shelf 4.
The right sides of a and 4b are connected to the inner peripheral surface of the receiving frame 2. Furthermore, hinge erecting walls 7, 7 are disposed opposite to each other at the rear end of the lid portion 3, and these hinge erecting walls 7,
Arc-shaped recesses 7a, 7a are arranged on opposing surfaces of the hinges 7, and the circular spherical part 8 of the hinge connecting fitting 9 is rotatably arranged in the arc-shaped recesses 7a, 7a. The lower part of the connecting fitting 9 is loosely installed in the long hinge hole 15 of the hinge shelf 4, and projections 10, 10 are provided at the lower end of the hinge connecting fitting 9 so as to engage with the lower surface of this long hinge hole 15. It is installed horizontally.

Next, on the inner circumferential surface of the receiving frame 2, shelves 11, 11 are horizontally protruded at positions of 120 degrees with respect to the hinge shelf 4, and the ends of the shelves 11, 11 have a U-shape in the diameter direction. Notches 12, 12 are provided. Recesses 13, 13 are provided on the surface of the lid 3 at the positions of the shelves 11, 11 of the receiving frame 2.
The side walls of the recesses 13, 13 are provided with inclined surfaces that expand outward, and the bottom walls of the recesses 13, 13 are provided with shelf portions 11, 11 in the diametrical direction.
Elongated holes 17, 17 are provided at the same positions as the notches 12, 12, and insertion pieces 14, 14 of the same shape are fitted into the recesses 13, 13.
Bar-shaped engagement fittings 18, 18 are provided upright on the lower surface, and these engagement fittings 18, 18 are slidably provided in the long holes 17, 17 and the notches 12, 12, and the engagement fittings 18, 18 are provided at the lower end. Engaging portions 19, 19 are provided, and these engaging portions 19, 19 engage with the lower surfaces of the shelf portions 11, 11 when the lid portion 3 is pushed up by water pressure or the like.

Next, we will discuss the case where the manhole shown in FIG. 3 is filled with running water and internal pressure is applied to the manhole cover 1. When the cover 3 is pushed up by water pressure, the protrusion 10 of the hinge connecting fitting 9, 10 engages with the lower surface of the hinge shelf portion 4 of the receiving frame 2, and the right side of the lid portion 3 cannot be pushed up any further. On the other hand, on the left side of the lid 3, when the lid 3 is pushed up, the engaging fittings 18, 1
The engaging parts 19, 19 of 8 are the shelves 11, 11 of the receiving frame 2.
It comes into contact with the lower surface of the lid 3, making it impossible to push the lid part 3 up any further. When the lid part 3 is pushed up, the lid part 3 is in a position substantially parallel to the receiving frame 2.
The water flow is drained to the road surface from the space between the receiving frame 2 and the lid part 3. When the water flow from the inside of the manhole stops flowing, the lid 3 lowers due to its own weight. Since there is a point contact, there is no degree of freedom in the horizontal direction.
The lid portion 3 is moved downward and attached to the inclined inner circumferential surface 2a of the receiving frame 2.
The sloped outer circumferential surface 3a of the lid portion 3 is fitted into the receiving frame 2, and the lid portion 3 is automatically placed on the receiving frame 2.

Next, we will discuss the case where a car or the like runs on the top surface of the lid part 3 shown in FIGS. 4 and 5 while it is being pushed up by water pressure. When the tire 20 of an automobile or the like rides on the hinge connecting fitting 9 of the lid part 3 while being pushed up, the lid part 3 is pushed to the left and tilted, so that the inclined outer circumferential surface 3a of the lid part 3 does not fit into the inclined inner circumferential surface 2a of the receiving frame 2, and the intermediate portion of the hinge connecting fitting 9 is locked to the left end of the hinge elongated hole 5 of the hinge shelf section 4, and the load applied to the lid section 3 is absorbed. receive. Therefore, the hinge shelf section 4 alone cannot withstand the applied load and will be damaged. Here, side plates 4a and 4b are vertically arranged on both sides of the hinge shelf 4, and these side plates 4
The right ends of a and 4b are connected to the inner peripheral surface of the receiving frame 2. As a result, the applied load is received by the hinge shelf 4 and the side plates 4a and 4b, which have an abbreviated cross-section, so that the strength is improved and no damage occurs.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the manhole cover, Figure 2 is a back view of the receiving frame and cover only, Figure 3 is a cross-sectional view of the cover pushed up by the water flow, and Figure 4 is the cover pushed up by the water flow. FIG. 5 is a sectional view showing a state in which a tire of an automobile or the like rides on the vehicle while being pushed up, and FIG. 5 is a partial sectional view of FIG. 4. 1-manhole cover, 2-receptacle frame, 3-cover part, 4-
Hinge shelf, 4a, 4b - side plate of hinge shelf, 5
~ Long hole for hinge, 7 ~ Upright wall for hinge, 8 ~ Round sphere part,
9-Hinge connecting fittings, 10-Protrusions, 20-Tires.

Claims (1)

[Scope of utility model registration request] A receiving frame, a lid fitted to the receiving frame, a hinge shelf protruding from the inner peripheral surface of the receiving frame and provided with a hinge hole, both sides of the hinge shelf and the receiving frame. a reinforcing member for the hinge shelf disposed on the inner circumferential surface; and an engaging protrusion loosely provided in the hinge through hole of the hinge shelf, the lower end of which is rotatable to the back surface of the lid. and a connecting means arranged at a position of 120° with respect to the hinge connecting fitting to be able to push the lid upward a certain distance relative to the receiving frame. Manhole cover with relief mechanism.