JPH0455098Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a manhole cover clamping device that prevents the clamp from coming off when the manhole cover is clamped in a frame.

(b) Prior Art A clamp is known that is attached to the outer periphery of a manhole cover using bolts so that it can move freely back and forth (Japanese Utility Model Publication No. 60-36442). After the clamp is moved forward and its tip is brought under the protrusion of the manhole frame, the bolt is tightened and the protrusion is tightened between the clamp and the lid to fix the lid.

(c) Problems to be solved by the invention In the conventional device as described above, as the vibrations are repeated due to cars passing over the lid,
The clamp may gradually move back and come off.

The object of this invention is to provide a clamping device for a manhole cover in which the clamp does not retreat even when vibrations are applied, and therefore the clamp does not come off.

(d) Means for solving the problems In order to solve the problems mentioned above, this invention has the following structure.

That is, an elongated bolt hole 5 is drilled in the direction toward the center near the outer periphery, and a recess 6 slightly larger than the bolt hole 5 is formed above the bolt hole 5.
a bolt 8 whose head is placed in the recess 6 and whose main body extends downward through the bolt hole 5; and a clamp 9 screwed into the lower part of the bolt 8. and a stopper 13 having an outer shape and thickness that fits directly into the recess 6, and a recess 14 having a size to fit the head of the bolt 8 on the front end side of the lower surface. It was used as a lid clamp device.

(E) Action Turn bolt 8 to lower clamp 9, and tighten bolt 8.
is retracted within the bolt hole 5, and the clamp 9 is retracted. Then, the lid 3 is fitted into the frame 1 of the manhole and placed on the protrusion 2 of the frame 1. Next, move the bolt 8 forward within the bolt hole 5, and when the tip of the clamp 9 comes to a position below the protrusion 2 of the frame 1, turn the bolt 8 to raise the clamp 9, and the tip of the clamp 9 and the lid 3. Tighten protrusion 2 between. Here, when the stopper 13 is fitted into the recess 6 of the lid 3 so that the recess 14 is on the outer circumferential side of the lid 3, the head of the bolt 8 is inserted into the recess 1 of the stopper 13.
It fits into 4. In this state, the rear end side of the stopper 13 prevents the head of the bolt 8 from retreating, so the bolt 8 and the clamp 9 do not retreat. Therefore, the clamp 9 will not come off.

(F) Embodiment One embodiment of this invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of this invention, and 1 indicates the frame of a manhole. Frame 1
A protrusion 2 is formed on the inner periphery.

3 is a manhole cover, and the cover 3 is placed inside the frame 1 and placed on the protrusion 2 so as to be large enough to sit on the protrusion 2. A seal ring 4 is attached to the lower surface near the outer periphery of the lid 3 to seal between it and the protrusion 2.

Elliptical bolt holes 5 are opened at some locations near the outer periphery of the lid 3, pointing toward the center. Further, above the bolt holes 5, recesses 6 each having an elliptical shape slightly larger than the bolt holes 5 are formed. Further, on the back side of the lid 3, two ribs 7 are formed so as to face each other at positions sandwiching each bolt hole 5, respectively. Note that, in FIG. 1, of the two opposing ribs 7, only the one on the opposite side is shown, and the one on the near side is not shown because it is in a position that cannot be shown.

A bolt 8 is passed through each bolt hole 5, and a female screw hole 10 is made in the clamp 9 below each bolt 8.
are screwed into each. The clamp 9 is approximately L-shaped and has a protrusion 11 formed on the upper rear end side. A pin 12 is attached to the lower end of each bolt 8.
The clamp 9 is prevented from falling off the bolt 8 by passing through each of them. In addition, the clamp 9 is
It has a width that fits between two opposing ribs 7 of the lid 3, and fits between the ribs 7. Opposing ribs 7 serve as guides for clamps 9.

A separate stopper 13 is prepared, and the stopper 13 has a shape and structure as shown in a perspective view in FIG. 2, and is made of an elastic material such as rubber. That is, the stopper 13 has an outer shape that fits into the recess 6 of the lid 3, and its thickness is the same as the depth of the recess 6. On the back side, a recess 14 is formed over more than half of the part, and a protrusion 1 is formed on the remaining part.
5 is formed. The recess 14 is sized to fit the head of the bolt 8, and the protrusion 15 is sized and shaped to be press-fitted into the bolt hole 5. In addition, at the end on the side where the protrusion 15 is formed,
A vertical groove 16 is formed.

The manhole cover 3 shown above is attached to the frame 1 in the following manner. First, each bolt 8 is turned to lower each clamp 9 and moved backward within the bolt hole 5, and the lid 3 is fitted into the frame 1 and placed on the protrusion 2.
Next, move the bolt 8 forward within the bolt hole 5, and when the tip of the clamp 9 comes to a position below the protrusion 2 of the frame 1, turn the bolt 8 to raise the clamp 9, and the tip of the clamp 9 and the lid 3. Tighten protrusion 2 between. Note that the pair of ribs 7 provided on the lid 3 serve as a guide when moving the clamp 9 back and forth. When the tightening is completed, the stopper 13 is inserted into the recess 6 of the lid 3, with the head of the bolt 8 fitting into the recess 14. The projection 15 is pressed into the bolt hole 5, and the stopper 13 is held firmly in the recess 6, in the position shown on the left side of FIG. In this state, the protrusion 15 side of the stopper 13 is located behind the bolt 8 and prevents the bolt 8 from moving back, so the clamp 9 does not move back and the clamp 9 does not come off. Therefore, when all the clamps 9 are used to fix the lid 3, the lid 3 is firmly clamped within the frame 1.

When the lid 3 is installed in the frame 1 as described above, the seal ring 4 seals between the protrusion 2 of the frame 1 and the outer circumference of the lid 3, and each bolt hole of the lid 3 is sealed. 5 is blocked by each stopper 13.
Therefore, rainwater and the like will not flow into the manhole, and neither water nor odor will leak out from within the manhole. The lid 3 does not rattle and cannot be opened by mischief. Moreover, even if the pressure inside the manhole becomes high, the lid 3 will not be blown away.

To remove the lid 3, first remove the groove 1 of the stopper 13.
Insert a screwdriver or the like into the lid 3 and knead it to remove the stopper 13 from within the recess 6 of the lid 3. Next, the bolt 8 is turned to loosen the clamp 9 and the bolt 8 is moved back within the bolt hole 5. After doing the above for all the parts, lift up the lid 3 and the frame 1 will open.
It can be removed from inside.

In addition, in the embodiment shown above, the clamp 9 is provided with the female screw hole 10;
It is also possible to simply drill a through hole and attach another nut.

(G) Effect of the invention In the manhole cover clamping device according to this invention, when the lid 3 is fixed within the manhole frame 1, the clamp 9 will not move back, and therefore the clamp 9 will not come off. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of this invention.
FIG. 2 is a perspective view showing the main parts of the embodiment. 1... Frame, 2... Projection, 3... Lid, 4... Seal ring, 5... Bolt hole, 6... Hollow, 7...
...Rib, 8...Bolt, 9...Clamp, 10...
...Female screw hole, 11...Protrusion, 12...Pin, 13
... stopper, 14 ... recess, 15 ... protrusion, 16 ... groove.

Claims (1)

[Scope of utility model registration request] A lid 3 has an elongated bolt hole 5 drilled in the direction toward the center near the outer periphery, and a recess 6 slightly larger than the bolt hole 5 formed above the bolt hole 5, and the head thereof is located inside the recess 6. A bolt 8 whose main body passes through the bolt hole 5 and extends downward, a clamp 9 screwed into the lower part of the bolt 8, and an outer shape and thickness that fit into the recess 6. A clamping device for a manhole cover, comprising a stopper 13 having a recess 14 on the front end side of the lower surface, the size of which fits the head of the bolt 8.