JPH0747952Y2 - Manhole cover open / close detection device - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of the Invention The present invention uses a sensor to open / close the manhole cover in order to monitor the open / closed state of the manhole cover using a wireless or wired communication system at a management center. The present invention relates to a manhole cover open / close detection device for detection.

Conventional technology Manholes used for entering and exiting a cave where communication cables, power cables, etc. are laid are important facilities.Therefore, the entrance and exit of the manhole must be strictly controlled by a management center. There is.

Conventionally, it is obligatory to notify the management center of entering and exiting the manhole, but it is necessary to go to the site to manage whether the manhole cover is currently open or already closed. In fact, it was extremely difficult.

In addition, recently, there are some people who enter and leave the manhole without obtaining permission from the management center, and there is a problem that the manhole is not sufficiently managed.

In order to solve such a problem, recently, a sensor is provided on a manhole cover, the closed state and the open state of the manhole cover are detected by the sensor, and the sensor information is wirelessly or wired at a management center. A system is used that monitors the open / closed state of a manhole cover by transmitting it via a communication system.

However, in the past, the sensor was directly attached to the manhole cover or in the vicinity of the manhole cover, but the attachment may be difficult depending on the type and structure of the sensor.

Therefore, an object of the present invention is to provide a manhole cover open / close detection device capable of installing an arbitrary sensor in a manhole regardless of the type and structure of the sensor and suitably detecting the open / close of the manhole cover. Is to provide.

Means for Solving the Problems The above object is achieved by the manhole cover open / close detection device according to the present invention. In summary, the present invention comprises an arm having one end pivotally attached to a wall surface of a neck of a manhole and a sensor attached to the other end of the arm for detecting an open / closed state of a manhole cover. This is a device for detecting the opening / closing of the characteristic manhole cover.

Embodiment Hereinafter, one embodiment of a manhole cover open / close detection device according to the present invention will be specifically described with reference to the drawings.

In this embodiment, a ring-shaped receiving frame 2 is provided at the upper end of the neck portion 1a of the manhole 1, and a manhole cover 3 is openably and closably fitted therein. The manhole cover 3 may include an outer cover and an inner cover, but in this embodiment, they will be described as a single unit.

A hinge 4 is attached to the wall of the manhole neck 1a,
One end 5a of an arm 5 is pivotally attached to the hinge 4 via a shaft 4. The arm 5 is preferably formed to be curved along the wall surface of the manhole neck 1a. The length of the arm 5 can be designed arbitrarily, but it is preferable that the other end of the arm 5 is located near the center of the manhole cover 3 when the arm 5 is rotated around the hinge 4. Is.

Also, a support rod 6 which can be adjusted up and down is attached to the other end 5b of the arm 5, and a sensor 7 is attached to the upper end of the support rod 6.
Is provided. In the present embodiment, the support rod 6 is screwed to the other end 5b of the arm 5 and can be adjusted up and down by rotating, but other methods known to those skilled in the art may be adopted. By vertically adjusting the support rod 6, the sensor 7 is set at a suitable position with respect to the manhole cover 3.

Further, the sensor 7 is an arbitrary sensor which is activated when the manhole cover 3 is closed or brought into contact with or close to the inner surface of the manhole cover 3. According to the present invention, the sensor 7 can be attached to the other end of the arm 5 via the support rod 7 in the present embodiment, so that the sensor of any kind or structure can be selected without selecting the kind or structure of the sensor. However, it is possible to attach it very suitably.

The on / off state of the sensor 7 is transmitted to the management center wirelessly or by wire, and the open / closed state of the manhole cover 3 is notified by turning on / off an indicator lamp or the like.

In the above-mentioned embodiment, when the worker enters the manhole 1, the hinge 4 is arranged so that the sensor 7 does not get in the way.
The arm 5 is rotated about the position of the arm 5 to move it to a position along the inner wall surface of the manhole 1 as shown by the solid line in FIG. After that, the manhole cover 5 is closed. Accordingly, the sensor 7 detects that the manhole cover 5 is closed and notifies the management center.

Effect of the Invention As described in detail above, the manhole cover opening / closing detection device according to the present invention has a sensor installed in the manhole via the swing arm to detect the open / closed state of the manhole cover. , Regardless of the type or structure of the sensor, any sensor can be installed in the manhole, it is possible to suitably detect the opening and closing of the manhole lid,
It is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a sectional view of a manhole showing an embodiment of a manhole cover opening / closing detecting device according to the present invention, and FIG. 2 is a partially cutaway plan view. 1: Manhole 1a: Manhole neck 3: Manhole cover 4: Hinge 5: Arm 6: Support rod 7: Sensor

Claims (1)

[Scope of utility model registration request] 1. An arm having one end pivotally attached to a wall surface of a neck of a manhole, and a sensor attached to the other end of the arm for detecting an open / closed state of a manhole cover. Open / close detection device for manhole cover.