JPH0312827Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Industrial application field The present invention relates to an inner cover of a manhole equipped with a locking mechanism.

(B) Conventional technology In order to lock the inner cover of a conventional manhole, for example, at the joint between the inner cover and the inner cover mounting frame, a plurality of bolt screws are placed on the circumference, spanning both sides.
Rust-proof bolts such as SUS were screwed into this to lock the inner cover to the inner cover mounting frame. In this case, there may not be much of a problem if the inner cover and inner cover mounting frame are manufactured in advance at a factory, but if this type of inner cover is attached to an inner cover mounting frame that is already installed on the road, ,
Thread cutting work had to be done on-site, and there were inconveniences such as having to bring a thread-cutting machine to the site.

Additionally, when opening and closing the lid, the seams between the lid and the lid mounting frame must be completely aligned with the threads of each bolt around the lid, otherwise the bolts cannot be screwed in, which is a time-consuming and inconvenient inconvenience. There was.

In addition, there are various types of locking mechanisms that are installed on the inner lid and the inner lid mounting frame, but all of them have key locking mechanisms on both the inner lid and the inner lid mounting frame, and when these mechanisms are engaged, the key can be locked. Due to the structure, it is difficult to attach the key lock mechanism to the inner cover mounting frame that is already installed on the road.

Furthermore, all conventional inner cover locking mechanisms have a locking mechanism on the surface of the inner cover, so when the outer cover of a manhole is opened, anyone can loosen the lock screw with an adjustable wrench or the like and open the inner cover. It had a structure that allowed for Therefore, there was a concern that a third party could break in and touch or operate the internal mechanisms.

(C) Problems that the invention aims to solve The present invention can be installed directly into an existing inner cover mounting frame without any modification, and even to an inner cover mounting frame with a different structure. To provide a manhole inner cover with a lock that prevents a third party from easily opening the inner cover even if the cover is opened.

(D) Means for Solving the Problem As shown in Figs. 1 and 2, a bent metal fitting 3 having a short side on one side is rotatably supported between the side-by-side supporting metal fittings 2 of the support plate 1. , a plurality of locking mechanisms 7 in which bolts 6 having a specific shape of bolt head, for example, a box hole 5, are screwed into the cylinder 10 of the support plate 1 to raise and lower the short side 4 of the bent metal fitting 3; This manhole inner cover has a structure in which a cylinder 10 is provided on the back surface of the inner cover 8 so as to protrude above the inner cover 8.

Note that the bolt 6 will not rotate unless a box hole with a specific shape is provided in the bolt head, such as a modified polygon, a modified circular shape, or a combination of the two, and a handle is shaped to fit into the box hole. The structure is such that it is not possible. Further, a cylinder 10 is provided on the support plate 1 so that the bolt 6 is always located inside the cylinder and cannot grip the outside of the bolt and rotate. Note that the head of the bolt head 6 may have a specific convex shape instead of the box hole 5.

Next, although three lock mechanisms 7 are provided in FIG. 4, two or four lock mechanisms 7 may be provided as appropriate.

Furthermore, in FIGS. 1 to 4, the lock mechanism 7 is integrated with the support plate 1 and is bolted to the back surface of the inner cover 8 with bolts 9, but the support plate 1
It is also possible to omit this and directly weld the parallel support fittings 2 to the back surface of the inner cover 8, and weld the cylinder 10 to the front surface thereof, thereby integrating the lock mechanism 7 with the inner cover.

(E) Function As shown in Fig. 1, a manhole is usually buried on the road and has a cover support frame 11 installed at the top, and an outer cover 12 and an inner cover 8 are attached to the cover support frame 11. The inner lid 8 prevents third parties from entering the hall, and if the gas accumulated inside explodes, the lid may fly off, damaging people or property, or causing people or cars to fall into the hall. In order to prevent this, a locking mechanism is provided, but the locking mechanism 7 of the inner lid 8
As mentioned above, until now there have been disadvantages such as there is no one that can be completely locked, and there is no one that can be easily attached to the existing lid support frame 11 as is.

With the above structure, the present invention first removes the outer lid 12 from the lid support frame 11 as shown in FIG. If the bolt 6 of the inner cover 8 is screwed out to the upper part of the drawing, the bent metal fitting 3 will have the short side 4 aligned with the long side 1, as shown by the dashed line in FIG.
Since it is shorter and lighter than 3, the long side 13 hangs down and is located inside the parallel support bracket 2, so the inner lid 8 fits into the lid support frame 11 as shown in FIG. Then, it is hooked to the inner lid hook portion 14.

Next, by inserting a handle with a head shape that matches the shape of the handle into the box hole 5 of the bolt 6 and screwing it in, the bolt 6 presses down on the short side 4 of the bent metal fitting 3, so the long side 13 is pushed up. As shown by the solid line, the inner lid hooking part 14 is connected to the peripheral part 15 and the long side 13.
The inner cover 8 is fixed to the inner cover hook 14 by being held by the inner cover 8.

Similarly, if a plurality of locking mechanisms 7 are hooked to the inner lid hooking portions 14 of the lid support frame 11, the inner lid 8 is firmly fixed to the lid support frame 11, and then the bolts 6 are loosened with an appropriate handle and bent. Connect the long side 13 of the metal fitting 3 to the inner lid hook 1
4, the inner lid 8 must be attached to the lid support frame 1.
It never deviates from 1.

By making the box hole 5 or the convex head of the bolt 6 have a special shape, the bolt 6 will not work unless you use a handle that fits in the box hole 5 or the convex head of the bolt 6.
Since the inner lid 8 cannot be rotated, a third party cannot open the inner lid 8.

Next, although there is a manhole cover support frame 11 having a cross section with 16 burrs as shown in FIG.
As shown in the figure, this can be applied in exactly the same way as in the case of FIG.

That is, as in the case of FIG. 1, after screwing out the bolt 6 and positioning the long side 13 of the bent metal fitting 3 within the parallel supporting metal fitting 2, and placing the inner lid 8 over the burr portion 16 of the lid support frame 11. , when the bolt 6 is screwed in with the handle, the long side 13 is pushed up and the burr part 16
is held between the inner cover 8 and the long side 13, and the inner cover 8 is fixed to the cover support frame 11.

(F) Effect of the invention As mentioned above, the inner cover 8 of the present invention has the locking mechanism 7 on the inner cover 8 itself, and there is no need to provide a locking partner mechanism on the cover support frame 11, so it can be attached to an existing manhole. is very easy to attach, and can be attached as is to lid support frames 11 of different shapes.

Since the locking mechanism 7 is provided on the back surface of the inner lid 8, it is difficult for a third party to understand the structure of the locking mechanism from the outside, and therefore, it cannot be opened using general tools such as pliers or an adjustable wrench.

Further, since the box hole 5 or the convex head of the bolt 6 is also made in a special shape, it cannot be opened unless a handle of a shape that matches the box hole 5 or the convex head is used.

Furthermore, since the bolt 6 is embedded within the cylinder 10, it is impossible to turn the outer periphery of the bolt 6 with pliers, pliers, or the like.

As described above, the manhole inner cover of the present invention has a simple structure, and can be easily installed in an existing manhole by carrying only the inner cover 8. Moreover, it is easily adaptable to different types of cover support frames. It has many features such as a structure that cannot be opened by a third party and a structure with strong mechanical strength.

[Brief explanation of drawings]

Figures 1 and 5 are a front view showing a partial cross section for explaining the present invention, Figure 2 is a right side view of the same, Figure 3 is a partial plan view for explaining the present invention, and Figure 4 is a partial cross-sectional view for explaining the present invention. Bottom view for explanation, 1 is a support plate, 2 is a parallel support metal fitting, 3 is a bent metal fitting,
4 is the short side of the bent metal fitting 3, 5 is the box hole for the bolt 6, 6 is the bolt, 7 is the lock mechanism, 8 is the inner cover, 9
10 is a bolt, 10 is a cylinder, 11 is a lid support frame, 12 is an outer lid, 13 is a long side of the bent metal fitting 3, 14 is an inner lid latching portion, 15 is a peripheral portion of the inner lid 8, and 16 is a burr portion.

Claims (1)

[Scope of utility model registration request] A bent metal fitting with a short side is rotatably supported between parallel supporting metal fittings on a support plate, and the short side of the bent metal fitting is moved up and down to support a bolt with a bolt head of a specific shape. A manhole inner cover characterized in that a plurality of locking mechanisms screwed into the cylinder of the plate are provided on the back surface of the inner cover with the cylinders protruding above the inner cover.