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KR100666535B1 - Emergency call device at construction site - Google Patents

Emergency call device at construction site Download PDF

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Publication number
KR100666535B1
KR100666535B1 KR1020050020533A KR20050020533A KR100666535B1 KR 100666535 B1 KR100666535 B1 KR 100666535B1 KR 1020050020533 A KR1020050020533 A KR 1020050020533A KR 20050020533 A KR20050020533 A KR 20050020533A KR 100666535 B1 KR100666535 B1 KR 100666535B1
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receiver
transmitter
construction site
emergency
buzzer
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KR20060099221A (en
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류내걸
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류내걸
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/24—Safety devices, e.g. for preventing overload
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

본 발명은 건설현장의 긴급상황 호출장치에 관한 것으로서, 보다 상세하게는 건설현장에 사용되는 차량에 수신기를 장착하여 경고음 및 경광등으로서 진행중인 작업을 잠시 중단하라는 신호를 보내는 호출장치이다.The present invention relates to an emergency call device for a construction site, and more particularly, a call device for sending a signal to temporarily stop work in progress as a warning sound and a warning light by mounting a receiver on a vehicle used in the construction site.

Description

건설현장의 긴급상황 호출장치{The emergency beeper on the construction spot}Emergency beeper on the construction spot

도 1a, 1b, 1c및 1d는 건설현장에서의 재해상황도Figure 1a, 1b, 1c and 1d is a disaster situation at the construction site

도 2는 본 발명의 구성예시도2 is a structural example of the present invention

도 3은 본 발명의 타실시예시도Figure 3 is another embodiment of the present invention

< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>

10. 발신기 11. 발신기몸체10. Transmitter 11. Transmitter Body

12. 발신안테나 13. 호출버튼12. Outgoing antenna 13. Call button

14. LED램프 15. 고리홈14. LED Lamp 15. Ring Groove

16. 마이크16. Microphone

20. 수신기 21. 수신기몸체20. Receiver 21. Receiver body

22. 거치대 23. 경광등22. Cradle 23. Warning lights

24. 스피커 25. 전원공급부24. Speaker 25. Power supply

25a. 전원선 25b. 전원잭25a. Power line 25b. Power jack

본 발명은 건설현장의 긴급상황 호출장치에 관한 것으로서, 보다 상세하게는 건설현장에 사용되는 차량에 수신기를 장착하여 경고음 및 경광등으로서 진행중인 작업을 잠시 중단하라는 신호를 보내는 호출장치이다.The present invention relates to an emergency call device for a construction site, and more particularly, a call device for sending a signal to temporarily stop work in progress as a warning sound and a warning light by mounting a receiver on a vehicle used in the construction site.

현재 산업보건법상 장비 작업시에 신호수(작업지휘자)를 배치하도록 규정하고 있으며, 상기 신호수는 신호봉 및 호루라기 등으로 운전자에게 작업신호 또는 중지신호를 보내고 있다. 하지만, 장비운전자가 작업에 몰두하거나 심한 소음 등으로 인하여 신호수의 신호를 인식하지 못할 때가 종종 있게 마련이며, 이 때문에 비상상황이 발생하여도 신호수가 신호봉, 호루라기 또는 육성으로서 그 사실을 장비운전자에게 알리기가 어려워서 산업재해를 막지 못하는 경우가 있었다.Currently, the Industrial Health Law stipulates that a signal number (work commander) is arranged when working on equipment, and the signal number sends a work signal or a stop signal to the driver with a signal rod and a whistle. However, it is often the case that the equipment operator is unable to recognize the signal of the signal number due to immersion in work or heavy noise, so that even if an emergency situation occurs, the signal number is notified to the equipment operator as a signal rod, whistle or foster. In some cases, it was difficult to prevent industrial accidents.

도 1a, 1b, 1c 및 도 1d는 최근 건설현장에서 발생한 장비작업시 사망사고의 재해상황도로서, 도 1a는 2004. 5. 14. 경남 거제시 아파트 신축공사현장에서 근로자(W)가 가설도로에서 보행중 후진하는 레미콘트럭(T)에 깔려 사망한 재해상황도이고, 도 1b는 2004. 5. 22. 서울시 서초구 빌딩 신축현장에서 지하층에서 지상층으로 이동하는 근로자(W)가 굴착작업을 하고 있는 백호우(B)의 뒤편으로 이동하다가 백호우에 다리가 깔려 사망한 재해상황도이고, 도 1c는 2004. 5. 29. 제주시 북제주군 골프장 조성공사에서 배수로 굴착저면에서 배수관 설치를 위해 파이프 형강관 이음부 밴드조임 볼트를 줍는 작업중 상부에 있는 백호우(B)의 버킷에 근로자(W)가 협착되어 사망한 재해상황도이며, 도 1d는 2004. 7. 1. 부산 사하구 아파트 부지조성 및 도시계획도로 개설공사 현장에서 신호수인 근로자(W)가 후진하는 덤프트럭(T)에 충돌하여 사망한 재해상황도이다.Figure 1a, 1b, 1c and 1d is a disaster situation of the death accident during the equipment work occurred in the recent construction site, Figure 1a is May 14, 2004 Workers (W) walking on the construction road in Geoje-si apartment building construction site Figure 1b is a disaster situation that was killed in a remicon truck (T) to retreat in the middle, Figure 1b is a backhoe (B) is excavated by workers (W) moving from the basement to the ground floor in the building construction site Seocho-gu, Seoul May 22, 2004 Figure 1c is a disaster situation diagram of a backhoe to death after moving to the back of the), Figure 29. Figure 1d is a disaster situation where a worker (W) is caught in a bucket of a backhoe (B) in the upper part of the work and died. FIG. 1D is a site of apartment construction and urban plan road construction in Saha-gu, Busan, July 1, 2004. It is a disaster situation that the worker (W), the signal count, crashed into the dump truck (T) that died and died.

상술한 바와 같이, 건설현장에서의 산업재해는 전국에 걸쳐 매우 빈번하게 일어나고 있으며, 위의 재해상황과 같은 경우는 장비작업시 운전자가 주위를 인지하지 못하여 발생한 사망사고이다.As described above, industrial accidents in construction sites occur very frequently throughout the country, and in the case of the above-mentioned disaster situation, the accident occurred due to the driver not aware of the surroundings when working on the equipment.

따라서, 본 발명은 상술한 재해상황과 같은 경우에 제3자의 호출로서 재해를 막을 수 있는 건설현장의 긴급상황 호출장치를 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide an emergency situation call apparatus at a construction site that can prevent a disaster by calling a third party in the case of the disaster situation described above.

또한, 상기 건설현장의 긴급상황 호출장치의 구성을 간단히 하여 가격이 저렴하며 다수의 건설기계 및 건설차량에 부착할 수 있도록 하는데 또 다른 목적이 있다.In addition, there is another object to simplify the configuration of the emergency call device of the construction site to be attached to a large number of construction machinery and construction vehicles at low cost.

본 발명은 건설현장의 긴급상황 호출장치에 관한 것으로서, 점차 작업이 인력시공에서 장비화되어가는 과정에서 장비작업시 운전자가 작업이나 운행에 집중하여 심한 소음 등의 이유로 주위를 인지하지 못하여 긴급상황이 발생할 때, 건설현장에 사용되는 차량에 수신기를 장착하여 경고음 및 경광등으로서 진행중인 작업을 잠시 중단하라는 신호를 보내는 호출장치이다.The present invention relates to an emergency call device of a construction site, the driver is not aware of the surroundings due to the heavy noise, etc. due to the concentration of work or operation during the operation of the equipment in the course of the work is gradually equipped in manpower construction When it occurs, it is a paging device that attaches a receiver to a vehicle used in construction sites and sends a signal to stop work in progress as a warning sound and a warning light.

현재 건설현장에서 일하는 근로자는 약 260만 명 정도이며, 이중 한해에 일어나는 재해는 약 2만 2천 건이 넘게 발생하고 있다(한국산업안전공단 2003년 통계). 이중 사망자는 762명에 달하고 있으며, 이런 수치는 하루에 2명 이상이 건설현장에서 재해로 사망하고 있다는 것이다. 또한, 산업재해로 인한 경제적 손실액은 2003년도 한해만 해도 12조 4천억원에 달하며, 이 금액은 노사분규로 인한 생산차 질액 2조 4,972억 원의 약 5배에 달하는 어마어마한 금액이다.Currently, about 2.6 million workers are working at construction sites, and more than 22,000 accidents occur each year (Korea Occupational Safety & Health Agency 2003 Statistics). The death toll is 762, which is more than two people a day dying at construction sites. In addition, the economic loss due to industrial accidents amounted to 12.44 trillion won in 2003 alone, which is about five times the production difference of 2.49 trillion won due to labor disputes.

본 발명은 상술한 건설현장의 빈번한 재해를 막고자 발명한 호출장치로서, 이하 첨부된 도면에 의해 본 발명을 상세히 설명하면 다음과 같다.The present invention is a calling device invented to prevent frequent disasters of the construction site described above. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

먼저, 도 2는 본 발명의 구성예시도로서 본 발명에 의한 건설현장의 긴급상황 호출장치는First, Figure 2 is an exemplary configuration of the present invention emergency call device in the construction site according to the present invention

RF방식으로 호출신호를 송출하는 발신안테나(12)와, 긴급상황 시에 손쉽게 누를 수 있는 호출버튼(13)이 형성된 발신기몸체(11)와, 상기 동작상태를 표시하는 LED램프(14)와, 전원을 공급하는 소형배터리로 구성된 발신기(10)와;A transmitter antenna 12 for transmitting a call signal in an RF manner, a transmitter body 11 having a call button 13 which can be easily pressed in an emergency situation, an LED lamp 14 for displaying the operation state, A transmitter 10 composed of a small battery for supplying power;

상기 호출신호를 일정거리 내에서 수신할 수 있는 수신안테나와, 상기 수신안테나를 내장하는 수신기몸체(21)와, 상기 수신기몸체(11)를 차량의 일부분에 고정할 수 있는 거치대(22)와, 상기 수신기몸체(11) 내부에 형성되어 비상음을 발생시키는 버저(buzzer, 도시하지 않음)와, 상기 버저의 작동과 동시에 동작하며 상기 수신기몸체에 끼움 결합하여 고장 발생시 교체가 가능한 경광등(23)과, 상기 버저 및 경광등(23)을 일정시간 동안 동작시키는 PCB기판(도시하지 않음)과, 상기 수신기몸체(11)에 전원을 공급하는 전원공급부(15)로 구성된 수신기(20)로 구성되어 있다.A receiving antenna capable of receiving the call signal within a predetermined distance, a receiver body 21 incorporating the receiving antenna, a cradle 22 for fixing the receiver body 11 to a part of the vehicle; A buzzer (not shown) formed inside the receiver body 11 to generate an emergency sound, and a warning light 23 that operates simultaneously with the operation of the buzzer and is fitted into the receiver body and replaceable when a failure occurs; The receiver 20 includes a PCB substrate (not shown) for operating the buzzer and the warning lamp 23 for a predetermined time, and a power supply unit 15 for supplying power to the receiver body 11.

여기서, 상기 발신안테나(12)는 RF(Radio Frequency, 무선주파수) 방식으로서 신호를 송출하며, 상기 발신기몸체(11)에 형성된 호출버튼(13)을 누르면 호출신호가 송출된다. 이때 상기 LED램프(14)는 발신기(10)의 동작상태를 표시하게 된다.Here, the transmitting antenna 12 transmits a signal in an RF (Radio Frequency) method, and when a call button 13 formed on the transmitter body 11 is pressed, a calling signal is transmitted. At this time, the LED lamp 14 displays the operating state of the transmitter 10.

또한, 상기 발신기몸체(11)의 일측에는 고리홈(15)이 형성되어 상기 고리홈 (15)에 끈 등을 끼워서 휴대하기 편리하도록 구성할 수 있다.In addition, one side of the transmitter body 11 is formed with a ring groove 15 can be configured to be convenient to carry by inserting a string or the like in the ring groove (15).

상기 수신안테나(도시하지 않음)는 발신안테나(12)에서 발신된 호출신호를 수신하며, 호출신호가 수신되면 PCB기판에서 경광등(23)과 버저를 동작시키게 된다.The receiving antenna (not shown) receives the call signal transmitted from the transmitting antenna 12, and when the call signal is received, operates the beacon 23 and the buzzer on the PCB.

상기 PCB기판은 디지털IC로도 구성할 수 있다.The PCB substrate may also be configured as a digital IC.

상기 경광등(23)은 건설기계 또는 건설차량의 운전석 주위에 설치되고, 운전자가 경광등(23)을 쉽게 보아야 하므로 시인성이 좋은 경광등을 사용하는 것이 바람직하며, 상기 버저에서 울리는 경고음의 크기는 건설장비의 소음수준(불도져 87dB, 페이로다 85dB, 백호우 86dB, 덤프트럭 88dB, 레미콘 80dB)과 시끄러운 건설현장을 고려할 때 80dB 이상이 되는 것이 바람직하다. 그러나 버저의 경고음 소리가 너무 크면 오히려 운전자에게 거부감을 줄 수 있으므로 경고음의 크기는 130dB 이하로 하는 것이 바람직하다.The beacon 23 is installed around the driver's seat of a construction machine or a construction vehicle, it is preferable to use a beacon with good visibility because the driver should easily see the beacon 23, the size of the warning sound ringing from the buzzer of the construction equipment Considering the noise level (87dB bulldozer, 85dB payload, 86dB backhoe, 88dB dump truck, 80dB ready concrete) and noisy construction site, it is desirable to be over 80dB. However, if the buzzer sound is too loud, it may give a sense of rejection to the driver.

상기 버저와 경광등(23)은 따로 구성할 수도 있고, 경광등(23)의 하측 내부에 버저를 같이 구성할 수도 있다.The buzzer and the warning light 23 may be configured separately, or the buzzer may be configured together inside the lower part of the warning light 23.

상기 거치대(22)는 차량에 견고하게 고정될 수 있도록 차량에 볼트 등으로서 고정하며, 양 측면에 수신기몸체(21)가 착탈될 수 있는 거치날개(26)를 구성하는 것이 바람직하나, 경우에 따라서는 접착소재 등으로 차량에 영구 고정시킬 수도 있다.The cradle 22 is fixed to the vehicle as a bolt so as to be firmly fixed to the vehicle, it is preferable to configure a mounting wing 26 that can be attached to the receiver body 21 on both sides, but in some cases May be permanently fixed to the vehicle with an adhesive material.

상기 전원공급부(25)는 차량의 전원을 사용함이 바람직하며, 전원잭(25b)을 차량의 전원콘센트에 끼워서 사용한다. 경우에 따라서는 배터리를 따로 구성하여 재충전 또는 교체하여 사용할 수도 있다.The power supply unit 25 preferably uses the power of the vehicle, and is used by inserting the power jack 25b into the power outlet of the vehicle. In some cases, the battery may be separately configured and recharged or replaced.

또한, 상기 발신기(10)와 수신기(20)의 주파수는 동일하게 맞추어서 제작하여야 하며, 필요에 따라 발신 및 수신 주파수를 변환시킬 수 있는 주파수변환장치(도시하지 않음)를 발신기 및 수신기에 각각 부가하여 구성할 수도 있다.In addition, the frequency of the transmitter 10 and the receiver 20 should be made in the same fashion, and a frequency conversion device (not shown) capable of converting transmission and reception frequencies as needed may be added to the transmitter and the receiver, respectively. It can also be configured.

도 3은 본 발명의 타실시 예시도로서, 발신기(10)와 수신기(20)에 각각 마이크(16)와 스피커(24)를 부가 구성하여 발신기(10)의 마이크(16)에 입력된 음성을 스피커(24)를 통해 운전자가 들을 수 있도록 구성한 것이다.3 is a diagram illustrating another embodiment of the present invention, in which the microphone 16 and the speaker 24 are additionally configured in the transmitter 10 and the receiver 20, respectively, to input the voice input to the microphone 16 of the transmitter 10. The driver is configured to listen to the speaker 24.

즉, 긴급상황이 발생하면 신호수(작업지휘자)가 발신기의 호출버튼(13)을 누르는 간단한 동작으로서, 수신기(20)의 경광등(23) 및 버저가 작동되도록 하여 운전자로 하여금 작업을 중단하도록 하고, 이후 마이크를 통해 운전자에게 다른 메세지를 전달하도록 한다.That is, when an emergency occurs, the signal number (work commander) is a simple operation of pressing the call button 13 of the transmitter. The warning lamp 23 and the buzzer of the receiver 20 are operated to allow the driver to stop the work. The mic then delivers another message to the driver.

본 발명의 또 다른 실시예로서는, 상기 건설기계 또는 건설차량의 후미에 관용의 후방감지센서(초음파센서)를 부착하여, 상기 후방감지센서에서 센싱된 값이 설정값 이상이 되면 상기 수신기(20)의 경광등(23) 및 버저가 작동하도록 구성할 수도 있다. 즉, 수신기(20) 내부에 발신기(10)의 발신으로 경광등(23) 및 버저가 작동할 수 있는 작동부A를 구성하고, 후방감지센서의 센싱으로 작동할 수 있는 작동부B를 따로 구성하여, 상기 작동부A와 작동부B가 서로 연계되어 작동할 수 있도록 구성할 수도 있다.In another embodiment of the present invention, by attaching a conventional rear detection sensor (ultrasound sensor) to the rear of the construction machine or construction vehicle, the warning light of the receiver 20 when the value sensed by the rear detection sensor is more than a set value; 23 and the buzzer may be configured to operate. That is, by configuring the operating unit A capable of operating the warning light 23 and the buzzer by the transmission of the transmitter 10 inside the receiver 20, by separately configuring the operating unit B that can be operated by the sensing of the rear sensor In addition, the operation unit A and the operation unit B may be configured to operate in conjunction with each other.

본 발명의 주된 목적은 건설현장에서 사용할 수 있는 호출장치를 제공함에 있으나, 경우에 따라서는 소음이 많이 발생하고 작업공정이 복잡한 공장 등의 작업 현장에서도 사용이 가능하며, 질식사고가 빈번한 밀폐 장소에서의 작업시에 비상상황이 발생하였을 때 긴급연락용으로도 사용할 수 있다.The main object of the present invention is to provide a paging device that can be used in the construction site, but in some cases it can be used in the workplace, such as a lot of noise and complex work process, in a closed place frequent choking accidents It can also be used for emergency contact in case of emergency during work.

또한, 반복 작업으로 운전자 및 작업자의 집중력이 떨어졌을 때, 주의환기용으로 사용하여 안전사고를 미연에 방지할 수 있다.In addition, when the concentration of the driver and worker is reduced by the repetitive work, it can be used for attention ventilation to prevent the safety accident in advance.

상술한 바와 같이, 본 발명에 의한 건설현장의 긴급상황 호출장치는 긴급상황이 발생하였을 때 신호수 또는 작업지휘자가 호출버튼을 누르는 간단한 동작으로 건설기계 또는 건설차량에 부착되어 있는 수신기의 버저와 경광등이 동시에 작동하여 운전자가 작업을 중단하도록 하여 건설재해의 발생을 막아주는 효과가 있으며, 운전자 및 작업자의 주의를 환기시켜 안전사고를 미연에 방지할 수 있는 효과가 있다.As described above, the emergency call device of the construction site according to the present invention is a simple operation of pressing the call button or the number of signals when the emergency situation occurs, the buzzer and the warning lights of the receiver attached to the construction machine or construction vehicle It works at the same time to stop the work of the operator to prevent the occurrence of construction accidents, and to bring the attention of the operator and workers to prevent accidents in advance.

또한, 그 구성을 간단히 하여 고장이 적고, 비교적 가격이 저렴한 긴급상황 호출장치를 제공한다.In addition, the configuration is simplified to provide an emergency call device with less trouble and relatively inexpensive price.

Claims (5)

발신기와 수신기로 구성된 호출장치에 있어서,In a calling device consisting of a transmitter and a receiver, RF방식으로 호출신호를 송출하는 발신안테나(12)와, 긴급상황 시에 손쉽게 누를 수 있는 호출버튼(13)이 형성된 발신기몸체(11)와, 상기 동작상태를 표시하는 LED램프(14)와, 전원을 공급하는 소형배터리로 구성된 발신기(10)와;A transmitter antenna 12 for transmitting a call signal in an RF manner, a transmitter body 11 having a call button 13 which can be easily pressed in an emergency situation, an LED lamp 14 for displaying the operation state, A transmitter 10 composed of a small battery for supplying power; 상기 호출신호를 일정거리 내에서 수신할 수 있는 수신안테나와, 상기 수신안테나를 내장하는 수신기몸체(21)와, 상기 수신기몸체(11)를 차량의 일부분에 고정할 수 있는 거치대(22)와, 상기 수신기몸체(11)에 형성되어 비상음을 발생시키는 버저와, 상기 버저의 작동과 동시에 동작하며 상기 수신기몸체에 끼움 결합하여 고장 발생시 교체가 가능한 경광등(23)과, 상기 버저 및 경광등(23)을 일정시간 동안 동작시키는 PCB기판과, 상기 수신기몸체(11)에 전원을 공급하는 전원공급부(15)로 구성된 수신기(20);A receiving antenna capable of receiving the call signal within a predetermined distance, a receiver body 21 incorporating the receiving antenna, a cradle 22 for fixing the receiver body 11 to a part of the vehicle; A buzzer formed on the receiver body 11 to generate an emergency sound, a beeping light 23 that operates simultaneously with the operation of the buzzer and is fitted into the receiver body to be replaced when a failure occurs, and the buzzer and the lighting light 23. A receiver (20) consisting of a power supply unit (15) for supplying power to the receiver body (11) and a PCB substrate for operating a predetermined time; 로 구성된 것이 특징인 건설현장의 긴급상황 호출장치Emergency call device of construction site 제 1항에 있어서, 상기 발신기(10)와 수신기(20)에 주파수를 변환시킬 수 있는 주파수변환장치를 발신기 및 수신기에 각각 부가하여 구성한 것이 특징인 건설현장의 긴급상황 호출장치The emergency call device of a construction site according to claim 1, wherein a frequency converting device capable of converting frequencies to the transmitter 10 and the receiver 20 is added to the transmitter and the receiver, respectively. 삭제delete 제 1항에 있어서, 상기 발신기와 수신기에 마이크와 스피커를 부가하여 구성하여, 발신기에서 발송하는 메세지를 스피커를 통해 전달받을 수 있는 것이 특징인 건설현장의 긴급상황 호출장치The emergency call device of a construction site according to claim 1, wherein a microphone and a speaker are added to the transmitter and the receiver to receive a message transmitted from the transmitter through a speaker. 삭제delete
KR1020050020533A 2005-03-11 2005-03-11 Emergency call device at construction site Expired - Fee Related KR100666535B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414308A (en) * 1987-07-07 1989-01-18 Tokyo Keiki Kk Helmet for alarm apparatus
KR19990048069A (en) * 1997-12-08 1999-07-05 김헌출 Worker Access Detection Device of Heavy Equipment
KR100470566B1 (en) 2001-12-19 2005-02-21 변승환 Safety system
KR200379923Y1 (en) 2005-01-11 2005-03-24 주식회사 더블유플랜 Safety warning device for construction equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414308A (en) * 1987-07-07 1989-01-18 Tokyo Keiki Kk Helmet for alarm apparatus
KR19990048069A (en) * 1997-12-08 1999-07-05 김헌출 Worker Access Detection Device of Heavy Equipment
KR100470566B1 (en) 2001-12-19 2005-02-21 변승환 Safety system
KR200379923Y1 (en) 2005-01-11 2005-03-24 주식회사 더블유플랜 Safety warning device for construction equipment

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