JP2004008269A - Backpack type extinguisher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backpack type extinguisher which can control the operation of a motor by the operation of a water jetting nozzle at the distal end of a hose without providing a cable parallel with the hose, and can control the water jetting. <P>SOLUTION: This backpack type extinguisher has a water bag 1 which is carried on the back of a human being, the water jetting nozzle 3, and an electric pump 7 which feeds water in the water bag 1 to the water jetting nozzle 3 as shown in Figure 2. In the backpack type extinguisher, the water jetting nozzle 3 can be manually operated and stopped. A pressure switch 10 which is normally closed and opened when the pressure of the water in a water feeding path exceeds a specified value is provided in the water feeding path which extends from the electric pump 7 to the water jetting nozzle 3. The pressure switch 10 is serially connected to a power source circuit of the electric pump 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backpack type fire extinguisher, and more particularly to a backing type fire extinguisher in which a person carries a water bag, sends water from the water bag to a water discharge nozzle by an electric pump, and grips the water discharge nozzle to discharge water. It is about.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a bag-type fire extinguisher in which a person carries a bag-shaped water sac and discharges water in the water sac by a hand pump has been widely used. Also, as described in Japanese Patent Application Laid-Open No. 2001-145704, a fire extinguisher that discharges water using the power of an electric pump is known.
[0003]
[Problems to be solved by the invention]
In the example described in the publication, by operating an operation switch provided on the water discharge nozzle, the valve of the water discharge nozzle is opened and closed and the drive stop of the motor is controlled to control water discharge. A cable for controlling the driving of the motor by an operation switch is arranged in parallel with the hose.
[0004]
However, this type of carrying fire extinguisher is used at the forefront of a fire site such as a wildfire, and is used under dangerous and severe conditions, so that the hose may be pulled, bent or bent. It is not uncommon for a twisting force to be applied.
[0005]
The hose itself is thick and strong enough to withstand the external forces that can occur during normal use.However, when cables are installed side by side with the hoses, the cables are usually less stretched than the hoses. The external force applied to the cable is concentrated on the cable, and the cable may be cut.
[0006]
Once the cable is cut, the motor will no longer operate and the pump will not be able to drive, so that even if there is enough water in the sac, it will not be possible to drain it.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can control a water discharge by controlling a motor operation by operating a water discharge nozzle at a tip of a hose without juxtaposing a cable to a hose. It is intended to provide a fire extinguisher.
[0008]
[Means for Solving the Problems]
Thus, the present invention relates to a backpack type fire extinguisher having a water bag to be carried by a person, a water discharge nozzle, and an electric pump for sending water from the water bag to the water discharge nozzle, wherein the water discharge nozzle can be manually discharged and stopped. A water supply path from the electric pump to the water discharge nozzle is provided with a pressure switch that is normally closed and opened when the pressure of water in the water supply path exceeds a predetermined value, and the pressure switch is connected to a power supply circuit of the electric pump. Are connected in series.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a backpack type fire extinguisher according to the present invention, in which a water bag 1 containing water therein and carrying a person A in a rucksack shape, a container 2 attached to the back of the waist of the person A, A comprises a water discharge nozzle 3 that is gripped and operated, and the water discharge nozzle 3 can be discharged and stopped by an operation lever 12.
[0010]
As shown in FIG. 2, a water absorption hose 4 connected to the water sac 1 and a water supply hose 5 for supplying water to the water discharge nozzle 3 are connected to the container 2. Reference numeral 6 denotes a connector for connecting the water absorption hose 4 to the water bag 1.
[0011]
In the container 2, a pump 7 for sending water from the water suction hose 4 to the water supply hose 5, a motor 8 for driving the pump 7, and a battery 9 as a power source for the motor 8 are accommodated. As the pump 7, it is preferable to use a diaphragm pump resistant to water contamination.
[0012]
Thus, in the present invention, a pressure switch 10 is provided in the water supply hose 5 as a water supply path from the pump 7 to the water discharge nozzle 3. The pressure switch 10 is normally closed, and is opened when the pressure of water in the water supply hose 5 exceeds a predetermined value.
[0013]
The pressure switch 10, the motor 8 for driving the pump 7, the battery 9, and the manual switch 11 for on / off operation from outside the container 2 are connected in series.
[0014]
In the present invention, since there is a possibility that the motor 8 may be momentarily overloaded, the battery 9 is provided with an output control circuit for controlling the output to the motor 8 so as to cope with the momentary overload. Is preferred.
[0015]
[Action]
In the present invention, since the pressure switch 10 is normally closed, when the manual switch 11 is turned on, the motor 8 is energized, and the motor 8 operates to drive the pump 7, and Water is sucked from the water absorption hose 4 and sent to the water supply hose 5.
[0016]
When the operation lever 12 of the water discharge nozzle 3 is not operated, the water discharge nozzle 3 is closed, so that the water fed into the water supply hose 5 stays in the water supply hose 5 and the pressure in the water supply hose 5 increases. . When the pressure exceeds a predetermined value, the pressure switch 10 operates to open the circuit, and the operation of the motor 8 stops.
[0017]
When the operation lever 12 is operated to open the water discharge nozzle 3, the water in the water supply hose 5 is discharged from the water discharge nozzle 3 and the pressure in the water supply hose 5 decreases. When the pressure becomes lower than a predetermined value, the pressure switch is switched. 10 is activated to close the circuit. Then, the motor 8 operates to drive the pump 7 to discharge water in the water bag 1 from the water discharge nozzle 3 through the water suction hose 4 and the water supply hose 5.
[0018]
When the operation of the operation lever 12 is stopped and the water discharge nozzle 3 is closed, the pressure switch 10 is opened again and the motor 8 stops as described above. When the operation lever 12 is operated to open the water discharge nozzle 3, the motor 8 operates again to drive the pump 7, and restart water discharge.
[0019]
【The invention's effect】
According to the present invention, since a cable for controlling the motor 8 is not juxtaposed to the water supply hose 5, even if an excessive force acts on the water supply hose 5 in handling the cable, the cable may be cut. There is no need to cut the cable to make it unusable.
[0020]
Further, since it is not necessary to provide a switch for controlling the motor 8 in the water discharge nozzle 3, the structure of the water discharge nozzle 3 is simple, and there is no possibility that at least an electric trouble will occur.
[0021]
Further, since the water supply hose 5 is provided with the pressure switch 10 for controlling the motor 8 by the pressure in the water supply hose 5, all the electric circuits except for the manual switch 11 can be accommodated in the container 2, and the number of failures is small. Become.
[0022]
The opening and closing of the water discharge nozzle 3 by the operation of the operation lever 12 causes the pressure switch 10 to sense the fluctuation of the pressure in the water supply hose 5 and controls the energization of the motor 8, so that the operator A operates the water discharge nozzle 3 at hand. The operation of the motor 8 can be controlled only by the above operation, the operation is simple, and no excessive load is applied to the motor 8. Also, an instantaneous overload due to opening and closing of the water discharge nozzle 3 can be dealt with by an electric protection circuit.
[Brief description of the drawings]
FIG. 1 is a side view showing a use state of a backpack type fire extinguisher according to the present invention. FIG. 2 is a longitudinal sectional view of a container according to the present invention.
Reference Signs List 1 water bag 3 water discharge nozzle 7 pump 10 pressure switch

Claims (1)

In a backing type fire extinguisher comprising a water bag (1) carried by a person, a water discharge nozzle (3), and an electric pump (7) for sending water from the water bag (1) to the water discharge nozzle (3), (3) The water can be manually discharged and stopped, and the water supply path from the electric pump (7) to the water discharge nozzle (3) is always closed and the water pressure in the water supply path exceeds a predetermined value. Characterized in that a pressure switch (10) that opens to the electric pump (7) is provided, and the pressure switch (10) is connected in series to a power supply circuit of the electric pump (7).

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