Abstract:
A fire alarm system is installed in a building containing therein a large number of rooms such as inns, hotels, office buildings and the like. The system comprises fire detectors, microphones and speakers installed in different rooms and connected to an administration room, so that when one of the fire detectors is put into operation, the microphone and the speaker turn on and inform the administration room of the operation of the fire detector. A conversation can be exchanged between the administration room and the room in which the fire detector is put into operation.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to an effective fire alarm system installed in a building containing therein a large number of rooms such as inns, hotels, office buildings and the like. 
     In general practice, as a fire counter-measure in hotels, buildings, etc., a fire detector is installed in different rooms. When the fire detector is activated an alarm, such as a buzzer, is sounded or a warning lamp in the administration room lights up. Otherwise, the signal is relayed to a fire station. 
     However, since a fire detector is put into operation even when there is no fire, there are many actual cases in which an alarm system is kept in a non-operating state. In such cases large-scale disasters are likely to occur. Furthermore, when a fire does actually break out, persons sleeping in a burning room don;t notice it or otherwise they become busy trying to extinguish the fire and sometimes fail to escape. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a fire alarm system capable of a communication between the guest room and the administration room at the initial stages of a fire or immediately after a fire detector has begun to operate. 
     It is another object of the present invention to provide a fire alarm system capable of giving suitable instructions for fire-extinguishing or sheltering to persons staying at the actual site of the fire, after completely grasping the situation, and further to minimize the extent of the disaster. 
     It is another object of the present invention to provide a fire alarm system capable of confirming whether a fire is occurred or not in a room by making inquiries to persons staying in the room where a fire detector is operated. 
     It is another object of the present invention to provide a fire alarm system, in the case of no fire, the execution of the proper steps suitable for the occasion shall be pointed out. 
     It is another object of the present invention to provide a fire alarm system, in the case of an actual, the execution of effective fire-extinguishing and sheltering procedures shall be out for the person staying at the actual site of the fire. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an explanatory construction diagram for explaining an embodiment of the present invention; 
     FIG. 2 is a circuit diagram for explaining in detail the embodiment shown in FIG. 1; and 
     FIG. 3 is a circuit diagram showing in detail the switching circuit shown in FIG. 2. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 is an explanatory block diagram for explaining an embodiment of the present invention. An example of a fire alarm system for use in hotels is described hereinafter. In FIG. 1, I and II represent respectively a guest room side and an administration room side. Although only one room is shown on the guest room side, all of the guest rooms are constructed in the same way. 
     In FIG. 1, 1 is a fire detector, 2 a microphone, 3 a speaker, 4 a treatment button used in the case of the occurrence of a fire, and 5 a treatment button used in the case of no fire. Those elements are installed at an optional place in the respective rooms. Generally, the elements 1 to 3 are installed on the ceilings of the rooms, and the elements 4 and 5 on the walls of the rooms. Usually or often, the microphone 2 and the speaker 3, etc. are turned off, and the treatment button 4 for use in case of a fire and the treatment button 5 for use in the case of no fire, are locked to keep them in an inoperative state. Otherwise, the power source for the electric circuit, caused by the buttons 4 and 5, is switched off. In any case, all of those elements are put into an inoperative state by manipulating those buttons. 
     In FIG. 1, 10 is a control box, 11 a microphone, 12 a speaker, and 13 a recording-play back device. Those elements are installed in the administration room. Here, assuming that the fire detector 1 is activated in a guest room because of a fire or others, the microphone 2 and the speaker 3 are turned on through the operation of the fire detector 1. At the same time, the lamp which is installed, for instance, on the control box 10 of the administration room, and which corresponds to the above-mentioned guest room is lit up and a buzzer is sounded. And further, the microphone 11, the speaker 12 and the recording-play back device 13 installed in the administration room are switched to the &#34;ON&#34; position and kept in the state in which a conversation can be automatically exchanged between one of the guest rooms and the administration room. Furthermore, the recording-play back device starts recording the conversation. 
     Consequently, when the supervisor of the administration room asks a question over the microphone 11, as for example, saying &#34;Has a fire broken out?&#34;, a voice duplicating the same message comes out from the speaker 3 in the guest room. To hear the sound of the voice, a person staying therein answers by saying &#34;Yes, a fire has broken out.&#34; in the case of the occurrence of a fire or by saying &#34;No, there is no fire.&#34; in the case of no fire. 
     When a fire breaks out in actuality, the supervisor of the administration room gives instructions on how to extinguish the fire, for example by pushing the fire treatment button 4, or by instructing the person staying in the guest room how to take shelter from the fire as for example informing him where the nearest fire escapes are located. At the same time the supervisor notifies the appropriate authorities such as the fire department. On the contrary, in the case of no fire, the supervisor makes an inquiry as to why the fire detector was activated and gives suitable instructions, as for example, instructions on pushing the no-fire treatment button 5 or on opening the windows in the guest room. 
     In such a situation, when button 4 is pushed, for example, the sprinkler in the guest room operates to extinguish the fire and the fire station is notified automatically. On the other hand, when button 5 is pushed, the reason why the fire detector operated is removed, for example, in the case when the fire detector is of the smoke-detecting type, the air conditioner is automatically started to remove smoke from the guest room. Furthermore, in the case when the fire detector is of the heat-sensitive type, the air conditioner is also put into operation so as to lower the temperature of the guest room. And further, the same operation as that used by pushing buttons 4 and 5 can be performed in the administration room. Therefore, it&#39;s possible for the supervisor to do the same as mentioned above in the case of a fire or no fire. 
     As embodiment of the present invention in which a conversation can be exchanged between a person staying at a place where the fire detector is put into operation and the supervisor of the adminstration room, immediately after the fire detector becomes activated has been described, heretofore. However, there were many cases in which no supervisor stayed in the administration room, or the supervisor stayed at a place quite distant from the administration room and thus it took a long time for him to get back to the microphone. On such occasions, a countermeasure could not be taken so quickly in the early stages of the occurrence of a fire requiring a quick response. 
     In consideration of such circumstances, it may be desirable to give the message &#34;Has a fire broken out?&#34; to the person in the room where the fire detector is activated. In FIG. 1, 6 is a synthesizer installed in the guest room for the above-mentioned purpose. On such occasions, when the fire detector 1 operates, the microphone 2 and the speaker 3, etc. are turned on, and the synthesizer 6 operates at the same time. The voice previously recorded in the synthesizer 6 comes out from the speaker 3. For instance, the speaker 3 makes an inquiry about the fire, saying &#34;Has a fire broken out?&#34;. 
     In such a way, it might be possible to make a first inquiry about the fire to the person in the guest room at the time of the fire&#39;s occurrence without involving the supervisor. Therefore, the initial fire-extinquishing activity and the advice about seeking shelter from the fire can be done promptly. Furthermore, the voice from the speaker 3 is transferred the microphone 2, and thereby the above-mentioned voice &#34;Has a fire broken out?&#34; is relayed to the supervisor staying in the administration room through speaker 12. Consequently, such information transmitted therethrough gives the supervisor a feeling of tension and an earlier warning so that he can respond more promptly. 
     Furthermore, as in the case of the afore-mentioned embodiment, the push buttons 4 and 5 are put into an operable condition or the electric circuit caused by those push buttons is activated in connection with the fire detector 1, and the recording-play back device 13 is put into operation to record the voice of the conversation exchanged therebetween. 
     And further, in the above-mentioned case, it doesn&#39;t necessarily follow that the supervisor has to stay in the administration room. If the supervisor isn&#39;t there, it is not possible to reach him. Assuming such a situation, in the case of equipping the building with a fire alarm system, according to the present invention, various suitable instructions are given to relevant persons. Namely, the system points out the relevant persons who can put the synthesizer 6 into an operable condition, and who can push button 4 in the case of a fire or push button 5 in the case of no fire. 
     FIG. 2 is a circuit diagram for explaining in detail the operation of the fire alarm system according to the present invention shown in the afore-mentioned drawing (FIG. 1). In FIG. 2, 7 is a cutter for cutting off the heat-sensitive element in the case when the sprinkler is activated by cutting off the heat-sensitive element, 8 an air-conditioning device, 9 a switching circuit, 14 a matching circuit, 15 a buzzer, 16 a monitor lamp, 17a and 17b amplifiers respectively, 18 an external notifying device, 19a through 19e distribution terminals, IC 1  and IC 2  circuit elements, MR 1  through MR 5  magnet relay coils, and R 1  through R 5  contact points of the respective magnet relay coils MR 1  through MR 5  . Concerning the other parts, a reference numeral same as that of FIG. 1 is attached to the part performing the same action as that of FIG. 1. 
     In FIG. 2, assuming that the fire detector 1 installed in the guest room I is activated by reason of the fire or others, the relay coil MR 1  is excited by the action of turning on the aforementioned fire detector 1, and thereby all of the contact points R 1  of this relay coil MR 1  are put in the state &#34;ON&#34;. As a result, the synthesizer 6 is activated, and the microphone 2 and the speaker 3 are respectively connected with the amplifiers 17a and 17b which are normally powered on. 
     On such occasion, the electric signal obtained by connecting the microphone 2 and the speaker 3 therewith is fed back through the circuit elements IC 1  and IC 2  to the administration room side II. At this time, the buzzer 15 emits a sound and the monitor lamp 16 is lit up. In such a way, the occurrence of anything unusual in the guest room I is notified to the supervisor. When the buzzer 15 is activated, the relay coil MR 3  connected in parallel with the buzzer 15 is excited at the same time and its contact point R 3  is switched on. And then, the recording-replaying device 13 is activated and the respective sounds of the microphone 2 and 11 and the sound of the synthesizer 6 are automatically recorded therein through the matching circuit 14. 
     By performing a series of operations as mentioned heretofore, a conversation can be exchanged between the guest room side I and the administration room side II. At this time, after making a confirmation of fire occurrence, the supervisor points out the person staying in the guest room to push the fire treatment push button 4 in the case of fire or to push the no fire treatment push button 5 in the case of no fire. 
     Moreover, in the fire alarm system according to the present invention, the afore-mentioned synthesizer 6 is installed therein and it is always activated with priority to the others regardless of presence of absence of the supervisor in the administration room. And further, the informations such as &#34;Has a fire broken out?&#34;, &#34;Push the push button 4 in the case of fire.&#34;, &#34;Push the push button 5 in the case of non-fire.&#34;, or the like are previously recorded in the synthesizer 6. Therefore, even though the supervisor doesn&#39;t stay in the administration room, an adequate indication can be delivered to the persons staying in the guest room I. 
     At this time, the voice sound signal output transmitted from the afore-mentioned synthesizer 6 is emitted from the speaker 3 through the switching circuit 9. At first, in the case of the occurrence of a fire, when the fire treatment button 4 is pushed, since the contact point R 1  of the relay coil MR 1  is kept to be put in a state of &#34;ON&#34; the cutter 7 is activated in order to cut off the heat-sensitive element for putting the sprinkler into operation and, at the same time, the relay coil MR 2  connected in parallel with the cutter 7 of the heat-sensitive element for putting the sprinkler into operation is excited. At this time, the contact point R 2  thereof is switched on and thereby the external notifying device 18 installed in the administration room II is activated in order to automatically notify the fire station of the occurrence of a fire. 
     Secondly, in the case of no fire, as for example, when the fire detector is activated by the smoke of cigarette or the increase of room temperature, since the contact point R 1  of the relay coil MR 1  is kept to be put in a state of &#34;ON&#34;, pushing operation of the no fire treatment button 5 causes the air conditioning device 8 to operate. The air-conditioning in the room can be performed in such way. 
     Furthermore, since the contact point R 1  of the relay coil MR 1  is put in a state of &#34;OFF&#34;, the fire treatment button 4 and the no fire treatment button 5 are interlocked so as not to be capable of operating at the time except for the occurrence of an unusual thing. And further, as mentioned above, regardless of presence or absence of the supervisor in the administration room the voice sound signal output of the synthesizer 6 is emitted from the speaker 3. When the supervisor stays in the administration room exchange a conversation with the person staying in the guest room, the voice sound of the supervisor is emitted from the speaker 3 in a similar way. In order to avoid the confusion due to both of those sound voices, when the supervisor gives an instruction to persons in the guest room through the microphone 11, for instance, by detecting the voice sound signal &#34;Has a fire broken out?&#34; the switching circuit contained in the fire alarm-system automatically cuts off the output of the afore-mentioned synthesizer 6 from the speaker 3. 
     FIG. 3 is a circuit diagram for explaining the operation of the above-mentioned switching circuit. When the fire detector 1 starts to operate the voice sound signal of the synthesizer 6 is emitted from the speaker 3 through the switching circuit 9. The person in the guest room is notified of anything unusual by the speaker 3. At the same time, the supervisor in the administration room is also notified of the unusual thing by the buzzer 1 and the monitor lamp 16. 
     The supervisor noticing the unusual thing gives a voice sound signal &#34;Has a fire broken out?&#34; to the microphone 11, and the given voice sound signal is discharged from the speaker 3 through the amplifier 17b so as to put a question to the person staying in the guest room of the actual situation therein. 
     At this time, since the voice sound signal &#34;Has a fire broken out?&#34; branched off from the amplifier 17b is input into the base of the transistor Q through the band-pass filter BPF, the transistor Q is turned on, and the relay coil MR 4  is excited and its contact point R 4  is also switched on. When the contact point R 4  is switched on, the relay coil MR 5  is excited and, at the same time, its contact point R 5  is also switched on. In consequence, the relay coil MR 5  is put into a self-holding condition. Afterwards, regardless of presence of absence of the voice sound signal from the microphone 11, the relay coil MR 5  is kept to be in a condition of being exicted. Namely, it follows that, since the relay coil MR 5  is in a state of being excited, the contact point R 5b  connected between the synthesizer 6 and the speaker 5 is put in a state of &#34;OFF&#34;, and thereby the synthesizer 6 and the speaker 3 are kept in a state of being separated from each other. 
     As is explained heretofore, in the case when the supervisor stays in the administration room II, the supervisor automatically turns off the output of the synthesizer 6 by means of the voice sound signal discharged from the microphone 11, so that the voice sound of the supervisor and that of the synthesizer are prevented from confusing with each other. 
     Furthermore, in FIG. 2, although only one room is shown at the guest room side I, the terminals of the other rooms are connected with the distribution terminals 19a through 19e respectively. In such a way of connection, all of the guest rooms can be constructed equally. And further, in the circuit diagrams shown in FIG. 2 and FIG. 3, the relay coils MR 1  through MR 5  are employed for convenience of operational explanation. However, in practice, those portions can be easily constructed with the electronic circuit. 
     As is apparent from the foregoing description, according to the present invention, a conversation can be exchanged between the guest room and the administration room at the initial stages of a fire and immediately after a fire has broken out and the fire detector has begun to operate. Therefore, it may be possible to give suitable instructions for fire-extinguishing or sheltering to persons staying at the actual site of the fire, after completely grasping the situation, and further to minimize the extent of the disaster. Furthermore, even in the case when the fire detector is activated in the case of no fire, adequate response can be made without falling into a state of panic. For the above reasons, the alarm circuit doesn&#39;t need to be kept in an inoperative condition, and as a result there is no possibility of a large-scale disaster occurring.