JPS636276Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an underground structure protection box.

The underground structure includes a water meter, valve, or water collection basin, and the protective box consists of a frame that accommodates the underground structure and a lid that opens and closes the upper opening of the frame. The lid that opens and closes the upper opening of the frame is usually rotated to open and close for ease and speed of operation.

Conventional devices of this type include the following. In the one shown in Fig. 1, a rotating shaft 2 is provided protrudingly opposite to the upper inner surface of a frame 1, a groove 4 formed on the lower surface of one end of the lid 3 is fitted into the rotating shaft 2, and the other end of the lid 3 is Frame 1
Lid receiving piece 5 protruding from the inner surface of the body excluding the rotating shaft side
It was designed to be placed on the In this case, since the lid receiving piece 5 is not provided on the rotating shaft, a load is applied directly to the rotating shaft 2 from the lid 3, and the rotating shaft 2 is often damaged.

In the one shown in FIG. 2, a rotating shaft 7 is provided protrudingly opposite to the upper part of the inner surface of the frame 6, and a lid receiving piece 8 of a uniform height is provided over the entire inner circumference of the frame 6 below the rotating shaft 7. , the guide surface 9 is bulged out closer to the rotation axis of the lid receiving piece 8. On the other hand, a groove 11 that opens outward is formed on the side wall of the lid 10, and a cam surface 12 is provided on the inner surface.As can be seen from the figure, when manufacturing the groove 11 of the lid 10, requires a core or insert, which is time-consuming, and the position of the lid receiving piece 8 is not the same as the frame 6.
Lid 1 because it is located relatively deeper than the upper end surface of the opening.
0 becomes high and unnecessary ribs have to be provided, making it heavy and expensive.

In the one shown in FIG. 3, the upper opening of a frame 14 having a lid receiving piece 13 is opened and closed by a lid 15, and the hinge part has a hinge member 16 inserted into a hole 32 made in the lid receiving piece 13. This requires bolts, nuts, etc. to fasten the hinge member 16, making it not only time-consuming to install but also expensive.

In the one shown in FIG. 4, a lid receiving piece 18 is provided protruding from three sides of the upper inner surface of the frame 17, and two brackets 19 are provided protrudingly from the remaining one side, and a rotation shaft 20 is provided thereon, and the bracket 19 is fitted into the lid receiving piece 18. A lid 2 having a notch 21 that
2, the load is more dispersed than the one in Fig. 1, but the load is often applied to the rotating shaft 20, causing damage to the rotating shaft 20.
Moreover, the lid 22 has a defect in strength since it is necessary to provide the notch 21.

Therefore, in view of the above circumstances, the present invention is designed to open and close the upper opening of the frame by rotating the lid, but it is designed to prevent damage to the rotating shaft due to no load being applied to the rotating shaft, and to make the lid durable. This is proposed to prevent the lid from lifting up after closing the upper opening with the lid, and although the lid rotates around the groove in the lid when opening and closing, the groove should not come into direct contact with the rotating shaft. Moreover, the lid is guided so as to be engaged with the engaging portion and stored in a predetermined position.

Hereinafter, the present invention will be explained in detail with reference to the drawings of FIGS. 5 to 7. The frame 23, which is rectangular in plan view, accommodates underground structures such as meters and valves of water supply equipment or water collection basins.
A rotating shaft 24 is provided protruding from the upper inner surface of one of the short sides and near one of the long sides. In addition, the lid receiving piece 25 is attached to the inner surface of the frame 23 so that the rotating shaft 24 is attached to the rotating shaft 24.
It is lower on the lower side than 4 and higher on the other side and protrudes.
That is, the lid receiving piece 25 is formed to be low near the rotating shaft 24 and along the long piece near the rotating shaft 24, and high elsewhere, and the continuous part of the low part 33 and the high part 34 is formed so that the lid is connected to the low part 33. A slanted guide surface 26 is formed to draw the object to the side. Furthermore, a concave engaging portion 27 is formed on the inner surface of the long side facing the guide surface 26 . Further, below the engaging portion 27 and the rotating shaft 24, the lid receiving piece 25 is separated from the inner surface and detoured near the inner surface so that it does not exist. This not only makes it possible to eliminate the need for a core or insert when manufacturing with casting or plastic, but also prevents sand from accumulating in the recessed part of the lid corresponding to the engaging part when opening and closing. It will fall downward. Note that the lid receiving pieces do not have to be provided all around the circumference and may be provided only at necessary locations.

On the other hand, the lid 28 opens and closes the upper opening of the frame 23, and is fitted into the opening, and the lid 28 is placed at a position corresponding to the rotating shaft 24 on the side wall of the short side of the lid 28.
A groove 29 that does not interfere with the rotating shaft 24 when placed on the lid receiving piece 26 is recessed, and a cam surface 30 that guides the lid 28 to the engaging portion 27 is formed at a position corresponding to the guide surface 26. Furthermore, an engaging piece 31 is provided protrudingly at a position on the side wall of the long piece of the lid 28 that corresponds to the engaging portion 27 .

When closing the upper opening of the frame 23 with this lid 28,
The engaging piece 31 is placed on the lid receiving piece 26 with the rotating shaft 24 received in the fitting groove 29 of the engaging portion 27 of the frame 23 and the cam surface 30 guided by the guide surface 26. Then, as shown in FIG. 6, the engaging piece 31 fits into the engaging part 27, and the cam surface 30 of the lid 28 is guided to the engaging part 27 by the guide surface 26, and is housed in a predetermined position, so that the lid receiving piece 25 placed on top. This lid 2
When the lid 28 is opened, the lid 28 is placed in the groove 2 as shown in FIG.
9 and rotate around the rotation shaft 24.

The present invention has the above-mentioned configuration, and most of the conventional ones do not have a lid receiving piece on the rotating shaft, so it is more likely that the rotating shaft will be damaged than the load concentrated on the rotating shaft and the lid will be damaged. However, since the lid can be supported by the lid receiving piece around the entire circumference, the strength of the lid is increased in appearance, and since no load is applied to the rotating shaft, there is no chance of damage. In addition, with this invention, after the lid is closed, the engaging piece of the lid fits into the engaging part of the frame, which prevents the lid from lifting up much more than when the lid is simply placed on it, making it difficult for the lid to come off. . At the same time, the lid can be rotated and removed, making it easy to replace the lid. Furthermore, since the position of the lid receiving piece other than the rotating shaft side is high, the lid can be formed relatively shallow, unnecessary ribs can be eliminated, and the lid can be made lightweight and inexpensive. Furthermore, when closing the lid, the lid can be easily guided by the guide surface of the frame and placed in a predetermined position in the upper opening of the frame. Furthermore, since there is no lid receiving piece below the engaging part and the rotating shaft of the frame, no core or insert is required during manufacturing, making it easy to manufacture the parts. Become. moreover,
There are recesses on both sides of the rotating shaft of the lid, which may trap sand, but there is no lid receiving piece at the bottom of this part, so sand falls downward when opening and closing, and sand is deposited on the lid receiving piece. It does not stick to the lid, and there is no chance of the lid becoming loose or lifting.

[Brief explanation of the drawing]

1 to 4 are diagrams of a conventional underground structure protection box, FIG. 5 is a perspective view of a specific embodiment of the present invention, and FIG. 6 is a cross-sectional view of FIG. The lid is shown in a closed state, and FIG. 7 is a sectional view similar to FIG. 5, but shows the lid in an open state. 23... Frame, 28... Lid, 24... Rotating shaft, 2
5... Lid receiving piece, 33... Low part, 34... High part, 26... Guide surface, 27... Engaging part, 29
... Groove, 30 ... Cam surface, 31 ... Engagement piece.

Claims (1)

[Scope of utility model registration request] This is an underground structure protection box in which the upper opening of the frame is opened and closed by rotating the lid, with a rotating shaft protruding from the upper inner surface of the frame, and a lid receiving piece on the inner surface of the frame that rotates along the rotating shaft. Lower than the shaft and protruding from the other side,
A continuous part between the lower part and the higher part of the lid receiving piece is formed as an oblique guide surface, and an engaging part is formed on the inner surface opposite to the guide surface, while the side wall of the lid receives the rotating shaft. What is claimed is: 1. An underground structure protection box, characterized in that a groove is recessed so as not to interfere with the structure, a cam surface is formed to be guided by a guide surface, and an engaging piece that fits into an engaging part is provided in a protruding manner.