JPS5944432A - Lock structure for cover of manhole - Google Patents

Abstract

PURPOSE:To prevent the occurrence of danger arising from the drifting or the loss of the cover of a manhole by flooding, air hammering, etc., by a method in which a fixing part and a receiving part are provided to the cover of the manhole and the cover is locked. CONSTITUTION:A square screw hole 3 is drilled at the center of the upside 2 of a disc form, a hook claw 6 whose downside 4 is inclined and projected toward the lower end 5, and a lock claw 8 is formed at the tip of an inversed L-shaped lock 7 at the center in order to form a male fixing part 1. On the other hand, in part of the cover A, an inclined circular female receiver 9 to be fitted with the male fixing part 1 and a hole 11 to be fitted with the hook claw are provided, a hole 10 to be inserted with the lock portion is provided at the center of the female receiver 9, and an inclined discharge groove 13 and a discharge hole 14 are provided on the periphery. A path 12 for the hook claw is provided in part of the periphery of the discharge groove 13, and the lock claw 8 of the male fixing part 1 is locked with the lock claw receiver 15 of the frame B. The cover A can thus be exactly locked, and the danger arising from the drifting and loss of the cover A and the occurrence of noise by impaction can be prevented.

Description

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

Conventional manhole covers are simply put on, 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 pop off and cause an accident, especially the water hammer effect caused by heavy rain. Dangers such as leaking lids and the air 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 disk-shaped upper surface 2, the lower surface 4 is inclined and has a substantially trapezoidal cross section, and a hook protrudes from the lower end 5 of the lower surface 4. A retaining pawl 6 is formed, an inverted-shaped locking part 7 is vertically provided in the center, and the tip of the locking part is a locking pawl 8. Next, insert the knife receiving part 9 into the fourth and fifth fists 8.
As shown in the figure, a female receiving part 9 with an inclined circular recess is formed in a part of the lid A, a male stator 1 is formed in the female receiving part 9, and on the outer periphery of the female receiving part 9, A spiral discharge groove 13 is formed, a discharge hole 14 is provided at the lowest part of the discharge groove 13, and a spiral latch pawl passage 12 that passes through the latch pawl fitting hole 11 is formed on the outer periphery of the discharge groove 13. The lowest part of the latch pawl passage 12 is set as the latch pawl stop position 12.Furthermore, a lip insertion hole 10 for a beam-shaped male stator 1 is bored in the center of the female receiving part 9.

The lock pawl receiver 15 is formed by extending the L-shape from the lower end of the receiving frame B, as shown in FIG.

Now, in order to use the present invention, align the mouth and lip part 7 of the male stator 1 with the ♀-shaped locking part insertion hole 10 of the female receiving part 9 of the lid A as shown in Fig. 7, and as shown in Fig. 9. Place the male stator 1 on the female receiving part 9 as shown in the figure, align it with the latch claw fitting hole 11 of the male stator 1, drop the latch claw 6 into the latch claw passage 12, and insert the handle 16 into the screw hole 3. When inserted and twisted 90 degrees, the opening claw 8 comes into contact with the lower end of the opening 2 claw receiver 15 and is removed, and the locking claw 6 formed on the lower end 5 of the male stator 1 is also twisted 90 degrees. As a result, the latch pawl 6 moves clockwise along the helical latch pawl passage 12 and stops at the latch 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.

It should be noted that if the opening of the present invention is provided at about six locations on the lid A, as in the embodiment shown in FIG. 11, the movement of the lid A can be completely stopped.

Furthermore, when muddy water, sand, etc. flows through the gap between the MA and the male stator 1, it is formed so that it travels along a spiral discharge groove 13, gradually descends, and is discharged from a discharge hole 14 into the sewer pipe.

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 slopes of the lower surface of the male stator and the surface of the female receiving part are perfectly aligned. The inverted-shaped lock inserted through the shaped insertion hole comes into contact with the lower surface of the two-claw holder, and the latching pawl does not move down the spiral latching path until it stops at the latching path stop position. In this case, the opening, the opening claw, and the locking claw should be formed so that they come into contact or stop at about 20 degrees from the front. In other words, when the male stator is twisted 70 degrees clockwise, the lock claws are locked into the tie X receiver 15, and when the male stator is stopped at 90 degrees, it is fixed in contact with a 20 degree margin. It was formed. 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, the lower surface of the male stator and the female receptacle are both slanted, so if the opening and the claw come into contact with the opening and the manhole, the locking claw will come off. There is no. Furthermore, the passageway of the latch pawl is spiral and gradually descends, and the latch pawl stop position is at the lowest position, so even if the latch pawl is caused by vibrations of the car, the male stator does not spring up from the lid, and the male stator remains attached to the lid. The more weight is applied, the more the male stator bites into the lid, preventing it from coming off.

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 mentioned above, since the lid is opened by the stator, the receiving frame and the lid will not be worn out due to the splashing or vibration of the lid due to passing cars, and noise will not be produced, and the lid will not leak out due to the water hammer phenomenon. This is a locking structure for manhole covers that is characterized by preventing the air hammer phenomenon.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the male stator. FIG. 2 is a longitudinal sectional view of FIG. 1. FIG. 6 is a plan view of the male stator. FIG. 4 is a partial perspective view of the knife receiving part. FIG. 5 is a longitudinal sectional view of FIG. 4. FIG. 6 is a plan view of the knife receiving portion. 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. Code: A is the lid 6 is the screw hole B is the receiving frame
4 is the lower surface 1 is the male stator 5 is the lower end 2 is the upper surface 6 is the latch claw 7 is the mouth, the lip 12 is the latch claw stop position 8 is the mouth, the lip 16 is the discharge groove 9 is the female receiving part 14 is the The discharge hole 10 is a lock part insertion hole. 15 is an opening, the claw receiver 11 is a latch claw fitting hole, and 16 is a handle 12 is a latch claw passage. Patent applicant: Hitoshi Kawasaki (Fig. 1)

Claims (2)

[Claims] (1) A prismatic screw hole 3 is bored in the center of the disc-shaped upper surface 2, the lower surface 4 is tilted, a protruding hook 6 is formed at the lower end 5, and an inverted-shaped opening is formed in the center. , the tip of the rib part 7 is the mouth, and the lip part 8 is the mouth.
A slanted circular female receiving part 9 into which the male stator 1 is to be fitted and a latch claw fitting hole 11 are formed in a part of the lid A, and the center of the female receiving part 9 is formed as a secondary stator 1. has a Q-shaped lock part insertion hole 10, and an inclined discharge groove 13 on the outer periphery.
A discharge hole 14 is bored in the lowest part of the discharge groove 13, and a hook passage 12 is provided in a part of the outer periphery of the discharge groove 16.
Attach the opening of the male stator 1 and the claw 8 to the lock claw receiver 15 of the frame B. The opening of a manhole cover is characterized by its opening. structure. (2) A manhole cover opening structure according to claim 1, in which the male stator 1 is provided at two or more locations on the cover A.