JPH0245311Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a work hole for inspecting or repairing water pipes, gas pipes, sewerage pipes, etc., that is, a hook hole structure of a cover for opening and closing the upper part of a manhole. It is.

<Conventional technology> Conventionally, a semi-cylindrical recess is formed in a part of the lid in the thickness direction of the lid, a semi-cylindrical plug is loosely fitted into the recess, and the plug is passed through the recess. It had a structure in which it was rotatably supported by suspended pins.
Publication No.).

In this case, when the lid is closed, the plug fits into the recess and closes it, so that dirt and the like do not enter the recess, but rainwater does enter the gap between the recess and the plug. In addition, rust may occur on the surface of the recess and the plug, and this rust may cause the two to stick together, or fine dust may enter and adhere to the gap between the two, causing the plug to rotate. There were drawbacks that made it difficult.

Furthermore, it requires a dedicated and movable part called a plug, which has the disadvantage of being expensive.

In addition, by inserting a plug made of soft rubber interposed between upper and lower plates connected to each other by screws into a long and narrow hook hole formed through the lid, and tightening or loosening the screw, the soft rubber can be inserted in the radial direction. There was also a structure in which the plug was inserted into and removed from the hook hole by being inflated or contracted (Japanese Utility Model Publication No. 45-25952).

However, this also requires a special part called a plug, which is expensive, and also requires a tool such as a screwdriver to operate the screw, making it difficult to open and close the lid quickly.

<Objectives to be Solved by the Present Invention> The present invention aims to obtain a hooked hole structure that does not require special rotating parts or tools as in the above-mentioned conventional devices, and allows for easy opening and closing of the lid. purpose.

<Means for Solving the Objective> In order to solve the above objective, the present invention is constructed as follows.

That is, a recess 4 whose outer end 4a opens to the outer peripheral end surface 2a of the lid 2 is formed in the outer peripheral part of the lid 2, and a recess 4 is formed at one side wall 4b of the recess 4 and at the upper middle part of the side wall 4b. A locking body 5 extending approximately halfway toward the side wall 4c of the body 5 is provided in a protruding manner, and the projecting end portion of the locking body 5 is formed to have a larger diameter than the body portion 5b.

<Function> The outer end of the recess 4 is opened to the outer peripheral end surface 2a of the lid 2, and one of the side walls 4 is opened to a part of the side wall of the recess 4.
Since the locking body 5 is provided that protrudes toward the other side wall 4c from b, the elongated operating rod 6 is inserted from the outer end 4a side of the recess 4, and the lower part thereof is locked in the locking body 5. The operating rod 6 tilts outward using the inner circumferential edge 1a of the lid fitting seat frame 1 located outside the recess 4 as a fulcrum, and its lower end moves the locking body 5 upward, that is, toward the recess 4 of the lid 2. Press upward.

This is because the distance from the fulcrum to the point of action becomes extremely small, increasing the boosting ability and reducing the burden on the operator at the initial stage of the lid opening operation.

Further, since the protruding end side of the locking body 5 is open, the opening amount of the recess 4 increases accordingly, and the dirt, etc. accumulated in the recess 4 is removed from the recess 4 of the operating rod 6 described above.
It is easily rejected when inserted into the machine.

Moreover, since the protruding end of the locking body 5 is formed to have a larger diameter than the body portion 5a of the locking body 5, the operating rod 6 is guided toward the highly rigid base side.

<Example> Next, an example according to the present invention will be described based on the drawings.

Reference numeral 1 denotes a cylindrical seat frame, and the inner circumferential surface of its upper wall is formed in a tapered shape that gradually becomes smaller in diameter toward the bottom.

Reference numeral 2 denotes a lid that is fitted and placed on the inner circumferential surface of the upper wall of the seat frame 1, and hook holes 3, 3 of the same construction are formed in the outer circumference of the lid with a pitch of 180 degrees.

One of the hook holes 3, 3 will be explained in detail with reference to FIGS. 1 to 3.

The hook hole 3 is connected to a recess 4 and a locking body 5 provided in the recess 4.
It consists of.

The recess 4 is formed on the outer circumferential portion of the lid 2 to have a uniform width in the radial direction and an arc shape in the depth direction, and the outer end 4a thereof is opened at the outer peripheral end surface 2a of the lid 2.

A locking body 5 is fixed to an upper portion of one side wall 4b of the recessed portion 4 at an intermediate portion in the left-right direction in FIG. 1 so as to protrude toward the other side wall 4c.

The amount of protrusion of the locking body 5 is approximately half of the width of the recess 4, that is, the dimension between the side walls 4b and 4c, and the protruding end of the locking body 5 is larger than the body 5a of the locking body 5. Also forms a large diameter flange 5b.

Reference numeral 6 designates an elongated operating rod, the lower part of which is bent into an L-shape, the left and right width of which is slightly smaller than the length of the body 5a of the locking body 5, and the vertical thickness of the rod 6. The gap is smaller than the gap 4d between the locking body 5 formed in the recess 4 and the bottom of the recess 4.

Next, the operation of the above embodiment will be explained.

When opening the lid 2, the lower part of the operating rod 6 is inserted into the gap 4d from the outer end 4a side of the recess 4, and the lower bent portion 6a of the operating rod 6 is locked to the body 5a of the locking body 5.

Next, when the lower back surface 6b of the operating rod 6 is brought into contact with the inner circumferential edge 1a of the seat frame 1 and the operating rod 6 is rotated counterclockwise in FIG. move.

As a result, the initial fixed state of the lid 2 to the seat frame 1 is released, and after that, the lid is lifted upward by hooking the locking body 5 with a finger or a hook (not shown), and is removed from the seat frame.

Here, when the operation rod 6 is used to open the opening operation, the flange 5b is connected to the body portion 5 of the locking body 5 by the operation rod 6.
Prevents careless movement from side to side. It also serves as a stopper for the wire when lifting the lid.

In addition, by inserting the operation rod 6 from the outer end 4a of the recess 4, the dirt and sand accumulated in the recess can be removed between the inner opening 4e of the recess 4, the protruding end of the locking body 5, and the side wall 4c. It is expelled from the side gap 4f to the outside, that is, upwardly.

<Effects of the invention> As explained above, according to the structure of the present invention,
The opening operation of the lid can be easily performed without requiring a special part to close the recess, and the cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the embodiment according to the present invention, Figure 2
The figure is a plan view thereof, and FIG. 3 is a cross-sectional view taken from FIG. 1. 1... Seat frame, 1a... Inner peripheral edge, 2... Lid, 2a
...Outer peripheral end surface, 3...Hook hole, 4...Recess, 4a...
...outer end, 4b...one side wall, 4c...other side wall, 5...locking body, 5a...body, 5b...flange, 6...operating rod.

Claims (1)

[Scope of utility model registration request] The outer end 4a of the lid 2 is attached to the outer peripheral end surface 2 of the lid 2.
A concave portion 4 is formed which opens at a side, and a locking body 5 is provided protruding from one side wall 4b of the concave portion 4 and at the upper part of the intermediate portion of the side wall 4b, reaching approximately halfway toward the other side wall 4c. Then, the protruding end of the locking body 5 is attached to the body 5.
A hook hole structure of a manhole cover formed with a larger diameter than a.