JPS5853334Y2 - manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a manhole, particularly its entrance opening.

In general, a manhole is a hole that allows people to enter and exit underground trenches for inspection and cleaning. A lid is provided.

However, in the past, this lid was simply placed on the opening, and as a result, there was a risk that a child might remove the lid out of curiosity and try to look inside and fall, and in fact, such accidents have also occurred. are doing.

One way to prevent such accidents is to install an inner lid inside the lid to prevent it from falling, but even if you do that, the inner lid itself cannot be easily removed. Otherwise, the effect will be diminished.

The present invention has been developed with the aim of eliminating such drawbacks, and it not only provides an inner cover at the entrance opening of the manhole to prevent falls, but also provides a structure that prevents the inner cover from being easily removed. This also reduces the risk of the inner lid itself being removed, further increasing safety.

The structure of the present invention will be explained based on drawings showing one embodiment. In FIG. 1, 1 is an entrance opening of a manhole;
3 is an iron lid that covers the opening 1, and 3 is an inner lid that is removably attached to the inlet opening 1 inside the lid 2.

In the above, the inner lid 3 according to the present invention, as shown in FIG. 2, includes an outer annular frame 4 made of reinforcing bars, an inner annular frame 8 having a diameter large enough to accommodate a hose, and reinforcing bars 5 passed between the two. In addition, a plurality of locking pieces 9 are provided on the outer periphery of the outer annular frame 4 to protrude outward, and in this embodiment, such an inner cover 3 is connected to the entrance opening. It is attached to section 1.

Then, on the manhole wall at the entrance opening 1, there is a third
As shown in the figure, first, a step 6 is formed on which the lid 2 is placed, and furthermore, from the bottom of this step 6, the locking piece 9 is attached to a vertical groove 10 corresponding to the interval. A lateral groove 11 is formed in series with the lower end of the vertical groove 10, and a recess 12 is formed further downward from the tip of the lateral groove 11.

That is, the inner lid 3 first has its locking piece 9 aligned with the vertical groove 1.
0 and then laterally rotated along the lateral groove 11 to fit into the recess 12 and be installed.

Therefore, in order to remove this, it is necessary to lift the inner cover 3, turn it sideways, and lift it again, which makes removal troublesome and difficult for children to understand.

In this case, in this embodiment, in addition to the lateral groove 11, there is also a recess 1.
However, even if such a recess 12 is not formed, even if there are only vertical grooves 10 and horizontal grooves 11, the structure is extremely difficult for small children to understand, so the inner lid 3 is difficult to understand. There is little risk of it being removed, and in view of this, it is not necessarily necessary to provide the recess 12.

In addition, the inner lid 3 may have various other structures, such as a structure in which parallel reinforcing bars are passed through the outer annular frame 4 at intervals sufficient to accommodate a hose.

The present invention has the above-mentioned structure, and since the present invention has an inner lid inside the lid body to prevent falling from which the inside can be seen, it is difficult for children to remove the lid body and look inside. Even if the product is about to fall, the inner lid can prevent an accident from occurring, allowing children and others to play safely.

In particular, in the present invention, the inner lid for preventing falling cannot be lifted until at least one end is turned sideways, making it difficult for children to figure out how to remove it. It has the effect of being less expensive and safer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an artificial manhole opening showing an embodiment of the present invention, FIG. 2 is a perspective view of an inner cover, and FIG. 3 is a partial front view of a manhole wall at the artificial opening. 1... Inlet opening, 2... Lid body, 3.
...Inner lid, 9...Latching piece, 10...
...Vertical groove, 11...Horizontal groove.

Claims (1)

[Scope of utility model registration request] At the entrance opening of the manhole, an inner lid for preventing falls is provided inside the lid covering the entrance opening, and a locking piece is provided protruding from the outer periphery of the inner lid, and a locking piece is provided on the outer periphery of the inner lid. The manhole is characterized in that it is provided with a vertical groove through which the locking piece passes, and a mechanism connected to a lower end of the vertical groove.