JPH053556Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a manhole cover locking device that prevents the manhole cover from fully opening when water levels rise and allows running water to overflow onto the street.

[Prior art and its problems]

Currently, a few ideas have been proposed as weight-type locking devices for manhole covers, but in all cases, when the water rises, the weight-type hooks are agitated by the high-pressure water flow, causing the lock to come off and the manhole cover to float up. There was a problem with the unveiling, which caused an unexpected fall accident.

In addition, many manhole covers equipped with a weight-type locking device generally use a T-shaped hinge on the opposite side, but if the manhole cover floats to the surface during high water, the manhole cover will roll using the hinge as a fulcrum. This has the disadvantage that the weight-type locking device is facilitated in dislodging, and also generates rocking noise.

[Means for solving problems]

The above problem is that the water flow is high pressure when the water rises,
Focusing on the causes of turbulent flow inside the manhole and the fact that the hinge hardware is loosely inserted into the engagement hole, this invention improves the structure and hinge hardware of a locking device that uses a weight type hook. The problem was solved by doing this.

In other words, this device is a manhole with a T-shaped hinge hardware pivotally attached to one side of the underside of the manhole cover 1, with the lower part inserted into an engagement hole provided in the manhole cover receiving frame, a recess is provided on the underside of the manhole cover receiving frame side of the engagement hole, and the T-shaped hinge hardware is provided with an upward protrusion that engages with the recess when the manhole cover is raised, and on the opposite back surface of the manhole cover, a key bar receiver is provided on an upper arm that protrudes toward the periphery, and a weighted hook with a hook part that protrudes upward on the lower periphery is attached so as to be able to swing freely, and the manhole cover receiving frame is provided with a V-shaped hook hanging part that is water-permeable and protrudes inward a short distance above the hook part.

[Effect]

When you press the receiving part on the upper arm of the weight type hook with the key stick, the weight type hook swings and the hook part moves inward from the bottom of the hook hanging part, so you can press the key stick 90 degrees as before. ° Rotate and pull up to open the manhole cover.

In addition, when the manhole cover floats up due to water pressure when the water rises, the protrusion of the T-shaped hinge fitting fits into the recess provided in the manhole cover receiving frame, and the hook part of the weight type hook becomes water permeable. It engages with the hook hanging part, forms a gap between the manhole cover and the manhole cover receiving frame, allows increased water to overflow, prevents large rolling of the manhole cover, and prevents the hook part from moving due to turbulent flow. It will not fall off from the hook hook.

〔Example〕

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing the structure of the right side of the embodiment according to the present invention, and FIG. 2 is a perspective view showing the structure of the left side.

FIG. 1 shows the structure of the hinge part of the manhole cover 1, where 3 is an engagement hole provided on the inner edge of the manhole cover holder frame 2, and 4 is a T that is pivoted on the lower surface of the manhole cover 1.
It is a letter-shaped hinge fitting.

The difference from the conventional device is that a recess 5 is provided on the lower surface of the manhole cover receiving frame side of the engagement hole 3, and an upwardly directed protrusion 6 is provided on the T-shaped hinge fitting 4 to fit into the recess 5 during floating. be.

FIG. 2 shows the structure of a lock device provided on the opposite side to the hinge portion.
The manhole cover 1 is provided with a weighted hook 1a which is mounted on the back surface of the manhole cover 1 so as to be freely swingable, with an upper arm 7 protruding toward the periphery having a receiving portion 9 for a key bar 8, and a hook portion 10 protruding upwards on the lower peripheral side.

In this embodiment, in order to downsize the weight type hook, the angle formed by the X-X line and the O-O line is 90° or less, and a stopper 13 is provided to prevent it from swinging beyond a certain angle. .

On the other hand, the manhole cover receiving frame 2 is provided with a water-permeable V-shaped hook hooking part 12 that engages with the hook part 10 and is spaced above the hook part 10.

As configured as above, manhole cover 1
When opening, press the receiver 9 with the key stick 8, rotate it 90 degrees, and then pull it up.

Since the structure on the opposite side of the manhole cover 1 is as described above, the manhole cover 1 can be opened to above the road surface.

Next, we will explain what happens when water pressure is applied when the water increases.

When water pressure is applied to the manhole cover 1, since the recess 5 and the hook hook 12 are spaced apart from each other,
The manhole cover 1 rises by that amount, creating a gap between it and the manhole cover receiving frame 2, causing the increased water to overflow and lowering the water pressure, as shown in FIG. When this water pressure drop is sufficient, the manhole cover 1 is closed.

If the water pressure has not decreased sufficiently, it continues to float, but since the protrusion 6 is engaged with the concave part 5 and the hook part 10 is engaged with the hook part 12, it will not open any further.

Furthermore, even if the weight type hook 11 is agitated by turbulence, the hook portion 10 protrudes upward and the hook hanging portion 12 has water permeability, so that the hook portion 1
Since no force is applied to the water flow to force it out of the hook hook 12, it does not come off the hook hook 12. Furthermore, since the convex portion 6 fits into the concave portion 5, not only does it not open like the conventional case, but also large rolling does not occur.

In addition, if the angle formed by the O-O line -X-X line is set to 90° or less as in the embodiment, there is an advantage that the length of the upper arm 7 and the size of the hook 11 and the hook hanging part 12 can be designed to be small. .

[Effect of idea]

According to the present invention, it is possible to obtain a locking device for a manhole cover that has a simple structure, has a drainage function when water rises, does not open due to turbulence, and is less likely to roll.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view showing the structure of the right side, FIG. 2 is a perspective view showing the structure of the left side, and FIG. 3 is an explanation showing the state when floating. It is a diagram. 1... Manhole cover, 2... Manhole cover holder frame, 3... Engagement hole, 4... T-shaped hinge hardware, 5...
...Concave portion, 6...Convex portion, 7...Upper arm, 9...
Receiving part, 10... Hook part, 11... Weight type hook, 12... Hook hanging part.

Claims (1)

[Scope of utility model registration request] In a manhole, a T-shaped hinge metal fitting 4 whose lower part is inserted into an engaging hole 3 provided in a manhole cover receiving frame 2 is pivotally attached to one side of the lower surface of the manhole cover 1. A recess 5 is provided on the lower surface of the side, and an upward protrusion 6 that engages with the recess 5 during floating is provided on the T-shaped hinge hardware 4, and protrudes toward the periphery on the back surface of the manhole cover 1 on the opposite side. A receiving part 9 for the key stick 8 is provided on the upper arm 7, and a weight type hook 11 having a hook part 10 projecting upward on the peripheral edge of the lower part is swingably attached, and the hook part is attached to the manhole cover receiving frame 2. This locking device for a manhole cover with a drainage function is characterized in that a V-shaped hook part 12 having water permeability is provided and projects inward at a slight distance upward from the manhole cover 10.