JPH0641555Y2 - Fire hydrant device with switch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fire hydrant device, and more particularly to a fire hydrant device having a switch for starting a pump.

2. Description of the Related Art A fire hydrant device housed in a casing is arranged on a wall surface of a tunnel or the like, and this fire hydrant device is provided with a waterproof limit switch that works in conjunction with a lever of a fire hydrant valve.

Then, when a flame occurs, the driver opens the door of the housing and turns the lever located near the fire hydrant valve in the specified direction.The fire hydrant valve opens and the cam rotates to press the rotating part of the limit switch. To do.

Therefore, the switch portion is pressed, the switch is turned on, the pump is activated, and the water supply into the hose is started.

Problems to be Solved by the Invention In the waterproof type limit switch of the conventional example, the rotor, the cam switch, and the like are exposed, so that they are easily rusted. Therefore, the switch may not turn on smoothly even if the lever is turned.

Further, since the switch portion is exposed, if an external force is directly applied to the switch for some reason, the pump may start without opening the fire hydrant valve. In such a case, it is troublesome because the operation panel must be used to stop the pump.

The present invention aims to prevent malfunction and rust of the switch.

Means for Solving the Problems This invention provides a box-shaped link guide cover on a door of a housing, which is connected to a fire hydrant valve and has a magnet fixed link.
The cover is slidably provided so that the magnet is always located in the cover, and the tip of the link projects from the tip of the door of the housing when the fire hydrant valve is fully opened. And in the cover,
It is an object of the present invention to achieve the above object by providing a proximity switch, which is operated by sliding of the link and has a movable part sealed, in the vicinity of the moving path of the magnet fixed to the link.

Action When the door is opened and the end of the link is pulled, the link slides, the fire hydrant valve is opened, and the magnet fixed to the link turns on the proximity switch in the link guide cover to start the pump. At this time, if the fire hydrant valve is fully opened, the tip of the link projects from the tip of the door. After the fire extinguishing work is completed, the end of the link is pushed in the direction opposite to the above direction and when the link is slid, the link returns to its original state and the fire hydrant valve is closed.

Since this proximity switch is covered with the link guide cover and the movable part is sealed and double-protected, the switch is protected even if water is sprinkled toward the switch or external force is applied. Since it has rust, it can prevent rust and malfunction.

Embodiments Embodiments of the present invention will be described with reference to the accompanying drawings, and the same reference numerals have the same names and functions. In the case 1, a fire hydrant pipe 3 having a fire hydrant valve 2 is arranged. The fire hydrant valve 2 is opened and closed by rotating the valve handle 4.

The valve handle 4 is connected to the handle 7 via links 5, 6. On the back surface 8A of the door 8 supported by the bearing 12, a box-shaped link guide cover 9 with the link 6 penetrating is fixed. The guide cover 9 plays the role of a magnetic shield case, and is formed by using a shield plate such as an iron plate.

Inside the cover 9, a self-holding type proximity switch 10 having a movable part sealed and a magnet 11 fixed to the link 6 are arranged. The proximity switch 10 is provided near the movement locus of the magnet 11.

Next, the operation of this embodiment will be described.

When a driver or the like pulls and opens the door 8 of the housing 1 in the A8 direction when a flame is generated, the door 8 becomes horizontal and the handle 7 appears in front of the eyes.

At this time, the link 6 rotates, but the connecting shaft between the link 5 and the link 6 is located at the position coinciding with the central axis of rotation of the door 8, and the link 5 and the main valve handle 4 do not move. Stay in the state. Then, when the handle 7 is pulled in the direction of arrow A7, the link 6 also slides horizontally in the same direction while being guided by the link guide cover 9.

Therefore, as shown in FIG. 2, the link 5 moves in the same direction to rotate the valve handle 4, so that the fire hydrant valve 2 starts to open and water supply to the hose (not shown) is started.

Further, as the link 6 slides, the magnet 11 also moves in the same direction to set the proximity switch 10 to the ON state, so that the pump (not shown) is started. When the handle 7 is further pulled in the A7 direction, the links 5 and 6 also move in the same direction as shown in FIG. 3 to rotate the valve handle 4, so that the fire hydrant valve 2 is fully opened. At this time, the magnet 11 is located away from the proximity switch 10.

After the fire extinguishing work is completed, when the handle 7 is pressed in the direction opposite to the A7 direction to return the handle 7 to the original position, the valve handle 4 is rotated in the opposite manner to the above, and the fire hydrant valve 2 is closed. At the same time, the proximity switch 10 is set to the off state by the movement of the magnet 11.

In this state, the door 8 is rotated in the direction opposite to the arrow A8 direction to close the door 8 of the housing 1.

Since the proximity switch 10 is magnetically shielded by the link guide cover 9 formed of a shield plate,
It is possible to prevent malfunction. This switch is not limited to the proximity switch, but it is needless to say that it may be, for example, a contact type switch that is turned on / off by sliding the link 6, or a non-self-holding type switch.

Effect of the Invention As described above, the fire hydrant device according to the present invention has the switch mechanism, that is, the link, in the box-shaped link guide cover.
Since the magnet fixed to the link and the proximity switch in which the movable portion is sealed are provided, the switch mechanism can be completely protected by the cover. Further, since the switch is a proximity switch with a movable part sealed, a double waterproof structure is constructed, and the switch mechanism can be protected even more completely. Therefore, the switch is not subjected to water sprinkling or direct external force, so that rust and malfunction of the switch can be completely prevented.

Further, since the magnet is fixed to the link that slides while being guided by the link guide cover, and the proximity switch is located near the movement locus of the magnet, the link is kept on a certain locus when sliding. The proximity switch can be reliably actuated by the magnet that always moves. Furthermore, since the link is provided so as to penetrate the box-shaped link guide cover, the link slides while being supported at two points at both ends of the cover. Therefore, rattling when the link slides can be minimized.

Further, since the link is provided so that the tip of the link protrudes from the tip of the door of the housing when the fire hydrant valve is fully opened, it is determined whether the tip of the link is fully opened or not depending on whether the fire hydrant valve is fully opened. It can be confirmed by whether or not

Further, although the link guide cover is formed by the magnetic shield plate, the external magnetic field is cut off, so that the malfunction of the proximity switch can be completely prevented.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIGS. 2 and 3 are views showing other states of FIG. 1, and FIG. 2 is a main part showing a state where a fire hydrant valve is half-opened. FIG. 3 is a vertical cross-sectional view showing a main part of the fire hydrant valve in a fully opened state. 1 ... Housing 2 ... Fire hydrant valve 5 ... Link 6 ... Link 8 ... Door 9 ... Link guide cover 10 ... Proximity switch

Claims (2)

[Scope of utility model registration request] 1. A box-shaped link guide cover is provided on a door of a casing, which is connected to a fire hydrant valve and has a magnet fixed link.
The cover is slidably provided so that the magnet is always located in the cover, and the tip of the link projects from the tip of the door of the housing when the fire hydrant valve is fully opened. And in the cover,
A fire hydrant apparatus with a switch, comprising a proximity switch which is activated by sliding of the link and has a movable part sealed, and is located near a moving path of a magnet fixed to the link. 2. The fire hydrant apparatus with a switch according to claim 1, wherein the link guide cover is formed of a magnetic shield plate.