JPH036667Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a manhole cover opening/closing tool used for opening and closing a manhole cover.

[Conventional technology]

Manholes for maintenance are installed on roads, etc. where telephone cables and water pipes are buried, and are covered with manhole covers.

In recent years, efforts have been made to open and close manhole covers in order to prevent unauthorized persons from entering and exiting manholes. For example, as shown in Figure 2, adhesive 4 is filled between the opening 2 of the manhole 1 and the manhole cover 3 that covers it, so that anyone other than the person concerned cannot open or close the manhole cover 3. There is something.

In addition, as shown in FIG. 3, a rod with a head 6 is inserted into the keyhole 5 of the manhole cover 3 and tightened through the tightening part 7 to prevent the keyhole 5 from being used and the cover is closed. There is one that has been locked.

When opening the manhole cover 3, in the former case, the manhole cover 3 filled with the adhesive 4 is
The manhole cover 3 is opened by destroying the area around the opening 2 with a rock drill.

In the latter case, the manhole cover 3 is opened by melting or cutting the head 8 of the head-equipped rod 6.

[Problem that the invention attempts to solve]

However, with such a conventional configuration, in the former case, the area around the opening 2 of the manhole 1 must be destroyed and restored each time the manhole cover 3 is opened and closed, and filling the adhesive 4 is also troublesome. It was difficult to open and close the manhole cover 3.

Furthermore, in the latter case, the head 8 of the head-equipped rod 6 must be melted or cut off each time maintenance is performed, which not only makes it difficult to open and close the manhole cover 3, but also makes it difficult to open and close the manhole cover 3. Since the head 8 protrudes from the upper surface of the manhole cover 3, there is a problem in that it is not convenient for walking or running.

Therefore, this invention was devised by focusing on the above-mentioned problem, and its purpose is to facilitate the opening and closing of manhole covers using keyholes, and to
To provide an opening/closing tool for a manhole cover that prevents the manhole cover from being opened and closed by persons other than those involved.

[Means for solving problems]

The structure of this invention that achieves the above object includes a lock part 14 that locks the closed state of the manhole cover 13.
A bottomed cylinder 15 that is loosely inserted into the keyhole 11 and has a flange 20 on the head that prevents downward movement.
and a rod 24 which is slidably provided in the cylinder 15 and has a plurality of lock holes 19A formed in its end face corresponding to the lock claws 21 of the tool 22;
A stopper pin 26 is provided between the rod 24 and the bottom of the cylinder 15 and is provided between the rod 24 and the bottom of the cylinder 15 to prevent the rod 24 from moving upward. The gist is that a biasing spring 27 is provided.

[Effect]

In the above configuration, in order to lock the closed state of the manhole cover 13, first, the stopper pin 26 is
is inserted facing into the disc-shaped keyhole 11, and the cylinder 15 is made to hang down via the flange 20 and washer 17.

Next, the tool 22 is inserted into the cylinder 15 through the opening 16, and the lock pawl 21 is inserted into the cylinder 15 through the opening 16.
Spring 27 by fitting it into the lock hole 19A of 4.
Push the rod 24 downward against the urging force of
Rotate it approximately 90 degrees further. As a result, the stopper pin 26 is perpendicular to the longitudinal direction of the keyhole 11, and is pressed against the periphery of the keyhole 11 by the biasing force of the spring 27, thereby locking its upward movement.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

Fig. 1 is a longitudinal sectional view showing the lock part of the manhole cover opening/closing device of this invention, and Fig. 4 is the − of Fig. 1.
5 is a view taken in the direction of arrow A in FIG. 1, FIG. 6 is a perspective view showing the tool, and FIG. 7 is a perspective view showing the key.

In the drawing, reference numeral 11 denotes a disk-shaped keyhole formed to open and close the manhole cover 13 by hooking a key 12, and a lock portion 14 for locking the manhole cover 13 in the closed state is provided in this keyhole.

The lock part 14 includes a cylinder 15 that is loosely inserted into the keyhole 11, and has an opening 16 in its head.
A tapered flange 20 is formed around it with a washer 17 interposed therebetween to prevent downward movement.
A top cover 18 is screwed onto the opening 16 of the cylinder 15, and a plurality of lock holes 19 (in this embodiment, two) are formed in the top surface of the top cover, and a tool 22 having a corresponding lock pawl 21 is inserted into the top cover. Otherwise, the upper lid 18 cannot be opened or closed. A bottom cover 23 is screwed onto the lower part of the cylinder 15, so that the cylinder 15 has a bottom.

A rod 24 is slidably provided inside the cylinder 15, and has a locking pawl 2 of a tool 22 on its head.
A lock hole 19A corresponding to 1 is formed.

A stopper pin 26 that protrudes from a pin hole 25 formed in the peripheral wall of the cylinder 15 to prevent upward movement is provided in the peripheral wall of the rod 24 so as to pass through it in the lateral direction. The pin hole 25 of the cylinder 15 has an elongated hole shape along the axial direction and has an opening angle of 90° in the circumferential direction.

Between the rod 24 and the bottom of the cylinder 15,
A coiled spring 27 is attached to urge the rod 24 upward. By opening and closing the bottom cover 23, the spring 27 can be replaced with a spring 27 having a length corresponding to the thickness of the manhole cover 13.

Reference numeral 28 is a key with a caster used to open and close the manhole cover 13, and uses a lever.

Next, how to use it will be explained.

In the above configuration, in order to lock the closed state of the manhole cover 13 after closing it in the manhole, first insert the stopper pin 26 into the disc-shaped keyhole 11 while facing it, and insert the stopper pin 26 through the flange 20 and washer 17. The cylinder 15 is made to hang down.

Next, the tool 22 is inserted into the cylinder 15 through the opening 16, and the lock pawl 21 is inserted into the cylinder 15 through the opening 16.
Spring 27 by fitting it into the lock hole 19A of 4.
Push the rod 24 downward against the urging force.

When the stopper pin 26 is located below the back surface of the keyhole 11, the rod 24 is free to rotate, so the tool 22 is used to rotate the rod 24 approximately 90 degrees.

When the tool 22 is removed, as shown in FIG. 5, since the stopper pin 26 is perpendicular to the longitudinal direction of the keyhole 11, it is pressed against the periphery of the keyhole 11 by the biasing force of the spring 27 and pushed upward. movement is prevented. The tool 2 is inserted into the opening 16 of the cylinder 15.
At step 2, the top cover 18 is screwed on, thereby completing the locking of the closed state.

Further, in order to unlock the closed state and open the manhole cover 13, the lock is released through the reverse process of locking the closed state, and the lock part 14 is removed from the keyhole 11. Then, the key 12 is hooked into the keyhole 11 and the manhole cover 13 is closed using a lever.

Note that this invention is not limited to the above embodiments, and various modifications are possible. For example, in this embodiment, the rod 24 has two lock holes 19A formed in its head, but the rod 24 is not limited to this.
It is also possible to form one or four lock holes 19A.

[Effect of idea]

As is clear from the above description, according to this invention, the lock portion 14 that locks the closed state of the manhole cover 13 is loosely inserted into the keyhole 11, and has a flange 30 on the head that prevents downward movement. A cylinder 15 with a bottom, and a rod 24 that is slidably provided in the cylinder 15 and has a plurality of lock holes 19A formed in its end face to correspond to the lock claws 21 of the tool 22.
is provided on the peripheral wall of the rod 24, and the cylinder 15
A stopper pin 26 protrudes from a pin hole 25 formed in the peripheral wall of the cylinder 15 to prevent upward movement, and a spring 27 is provided between the rod 24 and the bottom of the cylinder 15 and biases the rod 24 upward. With this structure, by using the special tool 22, the key 12 can be easily hooked into the keyhole 11 to open and close the manhole cover 13, and the closed state of the manhole cover 13 can be locked. Manhole cover 13 by a person other than the person concerned
can be prevented from being opened or closed.

As shown in the embodiment, if the tapered flange 20 is formed on the head of the rod 24, the protrusion of the manhole cover 13 will not be formed, making it extremely convenient for walking or running.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the lock part of the manhole cover opening/closing device of this invention, Fig. 2 is a longitudinal sectional view showing a conventional example, Fig. 3 is a longitudinal sectional view showing another conventional example, and Fig. 4. 1 is a sectional view taken along the line A in FIG. 1, FIG. 6 is a perspective view showing a tool, and FIG. 7 is a perspective view showing a key. 11... Key hole, 12... Key, 13... Manhole cover, 14... Lock part, 15... Cylinder, 19, 19A... Lock hole, 20... Flange, 21... Lock pawl, 22... Tools, 24...
Rod, 25...pin hole, 26...stopper pin, 27...spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A manhole cover opening/closing device in which a locking portion 14 for locking the closed state of the lid is provided in a keyhole 11 for opening and closing a manhole cover 13 by hooking a key 12, wherein the locking portion 14 is a key. A bottomed cylinder 15 that is loosely inserted into the hole 11 and has a flange 20 on the head that prevents downward movement.
a rod 24 which is slidably provided in the cylinder 15 and has a plurality of lock holes 19A formed in its end face corresponding to the lock pawls 21 of the tool 22; A stopper pin 26 protrudes from the pin hole 25 to prevent upward movement, and a spring 2 is provided between the rod 24 and the bottom of the cylinder 15 and urges the rod 24 upward.
7. An opening/closing device for a manhole cover, characterized by comprising: