JPS6033944B2 - Lock structure of manhole cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the protection of manhole covers from splashing, water hammer, and the like.

Conventional manhole covers are simply covered, so if the cover is placed in a place with a lot of car traffic or if it is old and worn out, the shock of passing cars can cause the cover to fly off and cause an accident, especially the water hammer phenomenon caused by heavy rain. Hazards such as leaking lids and the ``haaaah'' hammer phenomenon were occurring one after another in various places.

In addition, the wear of the lid and receiver frame caused impact noise every time a car passed, which was a problem in residential areas.

The present invention eliminates these drawbacks and provides a safe manhole cover.

To explain this structure with a diagram, the male stator 1
As shown in Figures 1, 2, and 3, a prismatic screw hole 3 is bored in the center of the disc-shaped upper surface 2, and the lower surface 4 is obliquely shaped to have a substantially trapezoidal cross section, protruding from the lower end 5 of the lower surface 4. A locking pawl 6 is formed, an inverted L-shaped locking part 7 is vertically disposed in the center, and a locking pawl 8 is formed at the tip of the locking part.

Next, as shown in Figures 4, 5, and 8, a female receiving part 9 is formed in a part of the lid A with an inclined circular recess, and the male stator 1 is fitted into the female receiving part 9. A spiral discharge groove 13 is formed on the outer periphery of the knife receiving part 9, a discharge hole 14 is provided at the lowest part of the discharge groove 13, and a hook fitting hole 11 is formed on the outer periphery of the discharge groove 13. A spiral latch pawl passage 12 is formed, and the lowest part of the latch pawl passage 12 is a latch pawl stop position 12'.Furthermore, a 0-type male stator 1 is installed in the center of the female receiving part 9. A lock part insertion hole 10 is bored. The lock pawl receiver 15 is formed by extending the L-shape from the lower end of the receiving frame B, as shown in Figure 5.

Now, in order to use the present invention, the 0-type lock part insertion hole 101 of the female receiving part 9 of the lid A and the lock part 7 of the male stator 1 are aligned as shown in Fig. 7, and the angle is adjusted as shown in Fig. 9. Place the male stator 1 into the female receiving part 9, fit it into the latch pawl fitting hole 11 of the male stator 1, drop the latch pawl 6 into the latch pawl passage 12, and insert the handle 16 into the screw hole 3. When twisted 90 degrees, the locking claw 8 comes into contact with the lower end of the locking claw receiver 15 and is locked, and the locking claw 6 formed on the lower end 5 of the male stator 1
By being twisted by 90 degrees, the latch pawl 6 moves clockwise down the helical latch pawl passage 12 and stops at a pawl passage stop position 12'.

In this case, the lower surface 4 of the male stator 1 and the inclined surface of the female receiving portion 9 are brought into close contact and fixed. In addition, if the locking mechanism of the present invention is provided at about three locations on the lid A, as in the embodiment shown in FIG. 11, the movement of the lid A can be completely stopped.

Further, when muddy water or sand flows in through the gap between the lid A and the male stator 1, it is formed so that it gradually descends along the spiral discharge groove 13 and is discharged from the discharge hole 14 into the sewer pipe. There is.

As described above, in the present invention, when the male stator is fitted into the female receiving part provided on the lid and the male stator is twisted with the handle 16, the slope Z of the lower surface of the male stator and the surface of the female receiving part are perfectly aligned. 0
The lock pawl of the inverted L-shaped lock part inserted into the car through the insertion hole comes into contact with the lower surface of the lock pawl receiver, and the latching pawl moves down the spiral latching path and stops at the latching path stop position.

In this case, the locking pawl and the latching pawl should be formed so that they start or stop about 20 degrees from the front. In other words, when the male stator was twisted 70 degrees clockwise. to the hook catcher 15.
Make sure that the locking claw is locked, and when it stops at 90 degrees, 2
It is formed so that it can be fixed in place with a 0 degree deviation. Therefore, when the male stator stops, the top surface of the male stator and the top surface of the lid are no longer uneven and become the same surface. Therefore, even if a car passes over the manhole cover, since the lower surface of the male stator and the female receiving part are both inclined, the locking claw will not come off if it supports the locking claw receiver.

In addition, the pawl passageway is spiral and gradually descends, and the pawl stop position is at the lowest position, so even if the pawl is shaken by the car, the male stator will not fly up from the lid, and the lid will bear weight. The more it is applied, the more the male stator bites into the lid, preventing it from shifting. In addition, the female stator and female receiving part of the lid are equipped with a drain groove and a drain hole, so even if muddy water or sand flows in, it will be discharged to the sewer pipe, so the male stator and female receiving part will always be kept dry. This prevents rust caused by moisture.

As described above, since the lid is locked by the stator, the receiving frame and diamonds will not wear out due to the lid popping or vibration caused by passing cars, and the noise will not be generated, and the lid will not leak out due to the water hammer phenomenon. This is a manhole cover locking structure that prevents air hammer phenomena.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the male stator. FIG. 2 is a longitudinal sectional view of FIG. 1. Figure 3 is a plan view of the male stator. FIG. 4 is a partial perspective view of the knife receiving part. Figure 5 is the 4th
Longitudinal cross-sectional view of the figure. FIG. 6 is a plan view of the knife receiving section. FIG. 7 is a structural diagram of the present invention. FIG. 8 is a partial perspective view of the embodiment. FIG. 9 is a plan view of the movement of the male stator. FIG. 10 is a longitudinal sectional view of FIG. 9.
FIG. 11 is a perspective view of an example of mounting a male stator. Ta code, A
is the lid, B is the receiving frame, 1 is the male stator, 2 is the top surface, 3 is the screw hole, 4 is the bottom surface, 5 is the bottom end, 6 is the latch claw, 7 is the lock part,
8 is a lock claw, 9 is a female receiving part, 10 is a lock part insertion hole,
11 is a latch pawl fitting hole, 12 is a latch pawl passage, 12' is a zero position for stopping the latch pawl, 13 is a discharge groove, 14 is a discharge hole, 15 is a lock pawl receiver, and 16 is a handle. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Scope of Claims] 1. A prismatic screw hole 3 is bored in the center of the disk-shaped upper surface 2, the lower surface 4 is inclined and a protruding hook 6 is formed at the lower end 5, and an inverted L is formed in the center. A male stator 1 is formed by using the tip of the letter-shaped locking part 7 as a locking pawl 8, and a slanted circular female receiving part 9 into which the male stator 1 is fitted and a latching pawl fitting hole 11 are formed in a part of the lid A. A square lock part insertion hole 10 is formed in the center of the knife receiving part 9, an inclined discharge groove 13 is bored in the outer periphery, and a discharge hole 14 is bored in the lowest part of the discharge groove 13. established,
This locking structure for a manhole cover is characterized in that a locking pawl passage 12 is provided in a part of the outer periphery of a discharge groove 13, and the locking pawl 8 of a male stator 1 is locked to a locking pawl receiver 15 of a frame part B. 2. The manhole cover lock structure according to claim 1, wherein the male stator 1 is provided at two or more locations on the cover A.