JPH0346599Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is designed to be carried by workers while working at sea, in facilities installed on the water, or on ships, etc.
This invention relates to a portable emergency radio transmitter that allows workers to notify their location in the event of an accident such as falling into the sea.

(Prior Art) Conventionally, there are automatic distress notification SOS buoys for ships, lifeboats, life rafts, etc. that have been established internationally or domestically.

In addition to these, helmet-type transceivers for telephone calls are also used in construction buildings on land and are worn by workers themselves.

(Problem that the invention aims to solve) However, the above-mentioned automatic notification SOS buoys and wireless devices installed on lifeboats, etc. are installed on ships' bridges, etc., based on related laws and regulations such as the Ship Safety Act, It is intended for rescue purposes and cannot be carried around for work. In particular, in the harsh environment of the Northern Ocean, leaving workers abandoned at sea even for a short time can lead to fatal accidents, so it is desirable to locate and rescue workers as soon as an accident occurs.

For this reason, there are helmet-type transceivers for making calls so that workers can carry them while they are working, but it is difficult to make calls if they fall overboard, and transceivers usually have rod antennas. Because it is a main body, there were problems such as the rod antenna sometimes breaking when falling.

Therefore, in order to solve the above-mentioned problems, the present invention allows the worker to carry it around without getting in the way of the work, has an antenna built into the transmitter, and in the event of a fall, the worker can simply pull out the antenna as soon as possible. The purpose of the present invention is to provide a portable emergency radio transmitter capable of emitting transmission radio waves.

(Means for Solving the Problems) In order to achieve the above object, the present invention houses parallel bendable ribbon antennas in a transmitter case frame equipped with a transmitter that generates transmitting radio waves of a predetermined frequency. A guiding portion is integrally molded and provided, and in front of the entrance and exit of the guiding portion, the ribbon antenna branches in opposite directions and extends substantially in a straight line, with the tip of the antenna protruding to both sides of the case frame. At the same time, the rear ends of the parallel antennas are connected with an insulator, and a switch means is provided for turning on the transmitter by pulling out either one of the branched antennas, and the ribbon antenna is pulled out. When the antenna becomes a ground antenna of a predetermined length, the antenna is electrically connected to a contact part fixed to the case frame and connected to the transmitter, and a transmission radio wave is emitted. There is.

(Function) Two parallel guides housed in the curved guide section
The rear ends of the book ribbon antennas are connected by an insulating plate through antenna contacts, and when one antenna is pulled out, the other antenna is also pulled out at the same time. The antenna can also be moved in the opposite direction to accommodate the antenna within the case frame.

When the antenna is stored, the free end of the actuator of one of the microswitches in the antenna contact portion is pressed against the antenna.

The micro switch, which is a power switch, has a B contact that opens when the actuator is pressed down, and when you pull out either of the antenna tips that protrude on both sides of the case frame, the parallel ribbon antennas open. Since it moves outward from the guiding part, the actuator of the microswitch is released and returns to its original position together with the actuator, turning the microswitch ON.

Therefore, current is supplied from the power supply to the transmitter circuit through the microswitch.

When the antenna is further extended, the rear end of the antenna is pulled out to the entrance/exit of the guiding part, hits a tongue-like projection formed on the case frame, and each contact of the antenna contact part contacts the respective contact spring facing each other. This contact spring is connected to the transmitter circuit by a lead wire.

Therefore, the transmitting section and the antenna are connected, and since the length of the antenna is set to be 1/4 of the wavelength λ of the transmitted radio wave, in this state, the maximum It can emit effective power radiation radio waves.

(Example) Embodiments of the present invention will be described based on the drawings.

The 400MHz band emergency radio transmitter A of the present invention shown in Fig. 1 is housed in a small case frame 1 made of impact-resistant synthetic resin, and the joints of the case frame 1 are sealed with rubber gaskets 3 or the like. Waterproofing measures have been taken.

Inside this case frame 1, there is a partition frame 4 integrally molded with the case part 2, and a transmitting part 5 provided on a printed circuit board and a transmitting radio wave Two parallel ribbon antennas 6 that are pulled out to a predetermined length to emit
A microswitch 7 serving as a power switch for supplying power to the transmitting section 5, and a mercury battery 8 serving as a power source are arranged closely spaced apart from each other, and necessary electrical wiring is provided.

Furthermore, a curved guide part 9 is formed in the partition frame 4 in order to accommodate the antenna 6 in a predetermined position, and a contact part connected to the transmitting part 5 is formed in the empty spaces on both sides of the entrance and exit of the guide part 9. Contact springs 10, 10 each having a V-shaped cross section are provided. This contact spring 10 is fitted with one end into the slit 4a of the partition frame 4 with the top 10a of the V-shape facing each other, and is fixed from above by heat welding or the like. Between the two contact springs 10, 10, tongue-like protrusions 4b, 4b protruding toward the entrance/exit of the guide portion 9 are provided on the partition frame 4.
The antenna 6 is integrally formed with the antenna 6 and serves as a stopper for stopping the antenna 6 from being pulled out at a predetermined position.

The transmitter 5 has a circuit configuration that generates a transmission radio wave with a frequency of 400 MHz, and one end of each contact spring 10 is connected to a lead wire from the output terminal of the power amplification circuit, which is the final stage of the circuit. There is.

The ribbon antenna 6 is made of two bendable stainless steel plates, and has a mounting L fitting 13 attached to its tip to facilitate pulling out. Further, rubber bushes 14 are provided near both sides of the case frame 2, into which the ribbon antenna 6 is inserted, and a predetermined sliding torque is applied when the antenna 6 is pulled out and pushed in.

At the rear end of the antenna, there are two antenna contact parts 15, 15 made of phosphor bronze plates, each fixed with an eyelet.
As shown in FIG. 2, this antenna contact portion 15 has a U-shaped cross section, and faces 15a, 15a fixed to the antenna 6, and surfaces 15b, 15b that contact the contact springs 10, 10 are on the outside. In addition, surfaces 15c, 15c, which extend over the antenna and serve as the terminal ends of the antenna, are connected and fixed by an insulating plate 16.

In addition, when the antenna 6 is pulled out, the length of the antenna as a ground antenna is λ/4, that is, λ/4=0.75(m)/4=18.8cm (∵λ=300(m)/(MHz)=300/400=0.75 (
m)) When the terminal surface 15 of the antenna contact part 15 becomes
c is set so as to abut against the protrusion 4b.

The micro switch 7 is arranged near the end of the guide section 9 on the partially opened side.
When the antenna 6 is stored, the actuator 7 of the micro switch 7 is connected to one contact of the antenna contact part 15.
The free end of a is in contact with the actuator 7b, pushing the actuator 7b.

As shown in FIGS. 3 and 4, the transmitter 1 configured as described above can be mounted on a helmet 22 by attaching a helmet mounting frame 21 to the outside of the transmitter case 2a with mounting screws 20. ing.

This mounting frame 21 has a rubber plate 2 inside a frame with a U-shaped cross section.
3 and is fixed with a mounting screw 24.
In addition to the helmet 22, the worker's waist belt,
Alternatively, it can be used by being attached to a life jacket 25 (see FIG. 5).

Next, the usage and operation of the transmitter 1 according to the present invention will be explained.

When a worker falls into the sea, the transmitter of this device triggers a micro switch 7 when the antenna 6 is pulled out.
actuator 7a is released and the switch is turned on.
The current from the power supply passes through the microswitch 7 and supplies current to the circuit of the transmitter 5.

When the antenna is pulled out until the rear end of the antenna touches the projection 4b of the stopper, the length of the antenna 6 forms a ground antenna whose length is 1/4 of the wavelength λ of the transmitted radio wave.

At this time, the antenna contact part 15 contacts the contact spring 10 of the contact part connected to the positive side of the circuit of the transmitting part 5 by a lead wire, and the transmitting part 5 and the antenna 6 are connected, and the radio wave from the transmitting part 5 is transmitted. is emitted into the air with maximum radiated power.

The emitted radio waves are caught by a receiver installed on the ship's bridge or observation post, which immediately alerts the surrounding area of the emergency situation with an audible alarm, and the position of the emitted radio waves is confirmed to enable rescue operations at the accident site. Do this.

One end of the other contact spring 10 is connected to the negative side of the battery, that is, to the ground side of the circuit of the transmitter 5, so in the embodiment of the present invention, one of the two antennas is used as a ground wire. If a worker falls overboard, the antenna on the bottom of the helmet will come into contact with the sea, ensuring grounding.

Therefore, it is possible to emit a radio wave with the most effective radiated power among the determined transmitting radio wave outputs.

Also, when the transmitter is attached to a helmet, it is not easy to extend the antenna upward;
The present invention has a configuration in which the antenna can be pulled out from either the top or bottom.

(Effects of the invention) As is clear from the above explanation, this invention allows workers to carry it around without getting in the way of their work, and in the event of an accident, they can simply pull out the antenna and transmit radio waves to call for rescue. A work supervisor on a ship or the like can use a receiver to immediately confirm the emission position of the transmitted radio waves and carry out prompt rescue operations.

The antenna is two parallel ribbon antennas whose rear ends are connected, so there is no need to worry about it breaking, and since it is bendable, the storage space can be reduced, making the transmission of this invention easier than conventional transceivers and other transmitters. The machine has fewer parts, making it smaller and lighter and reducing manufacturing costs.

As a result, this device can be distributed to each worker, which is advantageous from a safety standpoint.

Furthermore, since the antennas are provided on opposing sides and the rear ends of the antennas are connected, it is only necessary to pull out the antenna on the side that can be easily pulled out, and when one antenna goes in and out, the other antenna can also go in and out at the same time. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway vertical front view of the transmitter according to the present invention, Fig. 2 is an enlarged view of the rear end of the antenna when the antenna shown in Fig. 1 is pulled out, and Figs. 3 and 4 are the present device. An overall front view and a partial sectional enlarged view showing an example in which the is attached to a helmet, No. 5
The figure shows another embodiment in which the present device is attached to a life jacket. 1...Emergency radio transmitter, 1...Case frame, 5
...Transmission unit, 6...Ribbon antenna, 7...Micro switch, 8...Mercury battery, 9...Guidance guide section, 16...Insulating plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A guide section for housing parallel bendable ribbon antennas is provided in a transmitter case frame that is equipped with a transmitter that generates transmission radio waves of a predetermined frequency, and an entrance and exit of the guide section is provided. At the front, the ribbon antenna branches in opposite directions and extends substantially in a straight line, with the tip of the antenna protruding to both sides of the case frame, and the rear ends of the parallel antennas are connected by an insulator. A switch means is provided for turning on the transmitter by pulling out either one of the branched antennas, and when the ribbon antenna is pulled out and becomes a ground antenna of a predetermined length, the antenna and the case are connected. A portable emergency radio transmitter, characterized in that it emits transmission radio waves by electrically connecting a contact part fixed to a frame body and connected to the transmitting part.