JPS603158Y2 - Tight fitting device for manhole covers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a tight fitting device for a manhole cover.

Conventionally, this type of tight fitting device has either sandwiched a gasket on the outer periphery of the lid or fitted the outer periphery of the lid in a tapered manner; Since no positive external force is applied to the tightly fitted state, there is currently a desire for further improvement.

The purpose of the present invention is to meet the above-mentioned problems, and the wedge effect between the bag body and the wedge core material can prevent impact noise from being generated from the fitting part of the lid body even when a truck or the like passes by. By providing a device for tightly fitting the lid, the gist thereof is as described in the claims of the utility model registration.

Next, one embodiment of the present invention will be specifically described with reference to the drawings.

In the drawing, 1 is the frame of the manhole, and its inner peripheral edge 2
The outer circumferential edge 4 of the lid body 3 is loosely fitted into the.

Next, to explain the configuration of the main parts of the present invention, 5 in the figure.
5 are three wedge holes which are recessed in the outer peripheral edge 4 of the lid body 3 as shown in the figure, and their planar shape is a rectangular shape with an opening 5a.

The bag body 6 is formed into a box shape having an inner hole 6a with an open top surface, and in this example, is molded from a synthetic resin material for elasticity.

However, this bag body 6 has an outer shape that fits tightly into the wedge hole 5.

7 is a wedge core material, which is formed into a pyramid shape with a wedge effect.

Therefore, when the wedge core material 7 is press-fitted into the bag 6, the outer shape of the bag 6 expands.

Next, a method of handling the tightly fitting device for the lid body 3 constructed as described above will be explained.

First, the lid 3 is loosely fitted into the inner peripheral edge 2 of the manhole frame 1, and then the bag 6 is press-fitted into the wedge hole 5.

Then, when the wedge core material 7 is press-fitted into the inner hole 6a of this bag body 6, the outer shape of the bag body 6 expands, and one part of this bag body 6 is expanded.
Since the side ends are strongly pressed against a part of the inner circumferential edge 2 of the frame 1, the lid 3 is reliably and securely fitted within the inner circumferential edge 2.

Therefore, even if a truck or the like passes over the lid 3, no rattling noise is produced.

(Effects of the invention) The gist of the invention is the configuration described in the scope of the claims for utility model registration, and in addition to the above-mentioned effects, the invention has the following features:
When the lid is firmly fitted, the elastic outer peripheral surface of the bag 6 is engaged with the rough cast surface on the inner periphery of the wedge hole 5, so even if the truck passes over the lid 3, the The bag body 6 moves to the lid body 3 due to vibration.
On the other hand, the wedge core material 7 inside the bag body 6
Since the vibrations are damped by the vibration absorption properties of the bag body 6 due to its elastic properties, it has the effect of preventing the detachment of the tussock core material 7, which is also an effect unique to the present invention due to its unique configuration.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is an enlarged sectional view taken along the line A-A in the figure, and a cutaway perspective view showing the relationship between the bag body and the wedge core material. Frame body...1, Lid body...3, Bag body...
...6, Wedge core material...7゜

Claims (1)

[Scope of utility model registration request] At least three wedge holes 5 each having an opening 5a are formed in the outer periphery 4 of the manhole cover 3, and the cover 3 is fitted into the inner periphery 2 of the manhole frame 1 using a device to close the lid. When this happens, the bag body 6 molded into a bottomed box shape due to its elasticity is inserted into the wedge hole 5, and the wedge core material 7 is press-fitted into the inner hole 6a of the bag body 6. A tight fitting device for a manhole cover body, characterized in that: