WO2021113815A1 - Systèmes et procédés de sécurité de personnel - Google Patents

Systèmes et procédés de sécurité de personnel Download PDF

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Publication number
WO2021113815A1
WO2021113815A1 PCT/US2020/063603 US2020063603W WO2021113815A1 WO 2021113815 A1 WO2021113815 A1 WO 2021113815A1 US 2020063603 W US2020063603 W US 2020063603W WO 2021113815 A1 WO2021113815 A1 WO 2021113815A1
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WO
WIPO (PCT)
Prior art keywords
infrared
zone
portable item
machine
unsafe
Prior art date
Application number
PCT/US2020/063603
Other languages
English (en)
Inventor
David STAGG
Original Assignee
Cattron North America, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cattron North America, Inc. filed Critical Cattron North America, Inc.
Publication of WO2021113815A1 publication Critical patent/WO2021113815A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/142—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using image capturing devices

Definitions

  • the present disclosure relates to personnel safety systems and methods.
  • Machines may need to be enabled or disabled when a machine operator is within a certain distance from the machine.
  • hardwired emergency stop stations are often used in connection for machine and equipment safety, to allow operators to safely bring a machine or process to a safe state.
  • these hardwired stations can require time for an operator to move to the location of the hardwired stop switch in order to trigger the emergency stop process.
  • FIG. 1 is a diagram illustrating a personnel safety system according to an exemplary embodiment of the present disclosure.
  • FIG. 2 shows an exemplary vest, harness, or halter that may be worn by personnel for use in a personnel safety system (e.g., FIG. 1, etc.) according to exemplary embodiments.
  • FIG. 3 shows infrared emitters defining a safe zone (Zone 1) and an unsafe/shutdown zone (Zone 2) relative to a machine for use in a personnel safety system (e.g., FIG. 1, etc.) according to exemplary embodiments.
  • FIG. 4 shows an integrated infrared (IR) unit or head that may be used for defining at least a first safe zone relative to a machine for use in a personnel safety system (e.g., FIG. 1, etc.) according to exemplary embodiments.
  • IR infrared
  • FIG. 5 shows an IR controller and three IR emitters that may be used for defining at least a first safe zone relative to machine for use in a personnel safety system (e.g., FIG. 1, etc.) according to exemplary embodiments.
  • FIG. 6 shows an exemplary machine control unit (MCU) that may be used in a personnel safety system (e.g., FIG. 1, etc.) for controlling operation (e.g., shutting down, etc.) a machine (e.g., FIG. 3, etc.) according to exemplary embodiments.
  • MCU machine control unit
  • a vest, harness, or halter (broadly, a wearable and/or portable item) includes a number of infrared (IR) sensors.
  • the IR sensors are configured (e.g., spaced apart, oriented, etc.) for sensing (e.g., detecting, receiving, picking up, et.) an encoded infra-red (IR) beam(s) covering a defined zone(s) relative to a machine(s).
  • the vest may include a controller (e.g., a control pack with a rechargeable battery pack, etc.) that decodes the infra-red (IR) beam(s) and then re-encodes the data into an radio frequency (RF) transmitter.
  • the RF transmitter transmits or sends secure RF message(s) to an RF receiver.
  • the RF receiver is configured to process the received RF message(s) and determine a relatively precise or exact location of the operator (or other personnel) wearing the vest based on the coded IR.
  • the controls outputs of the RF receiver may comprise safety relays, normal relays, EtherNet and/or Serial data, which may be integrated into a machine to control the machine functions based on the determination or knowledge of the whereabouts of the person(s) relative to the machine.
  • FIG. 1 illustrates an exemplary embodiment of a personnel safety system 100 embodying one or more aspects of the present disclosure.
  • the personnel system 100 generally includes an infrared (IR) encoder 104, IR sensors 108, an IR decoder 112, a secure radio frequency (RF) encoder 116, a secure RF decoder 120, an IR zone decoder 124, and safety relays 128.
  • IR infrared
  • RF radio frequency
  • the IR encoder 104 may be configured to continuously send an encoded message(s) via a secure IR beam 106, which may be received, detected, and/or sensed by one or more of the IR sensors 108.
  • An IR decoder 112 may decode the secure message(s) received by the one or more IR sensors 108.
  • the decoded message may be re-encoded by the secure RF encoder 116.
  • the re-encoded RF message may be decoded by the secure RF decoder 120 for use by the IR zone decoder 124.
  • the location of the operator (or other personnel) wearing the vest may be determined based on the coded IR.
  • the safety relays 128 may be used to control machine functions based on the determination of the whereabouts of the person(s) relative to the machine. For example, the safety relays 128 may be used to shut down operation of a machine (e.g., machine 340 in FIG. 3, etc.) if it is determined that a person wearing the vest with the IR sensors (e.g., vest 202 with IR sensors 208 in FIG. 2, etc.) is within an unsafe zone (e.g., zone 2 in FIG.
  • a safe zone e.g., zone 1 in FIG. 3, etc.
  • FIG.2 illustrates a vest 202 (broadly, a wearable/portable item) that may be worn by personnel for use in a personnel safety system (e.g., system 100 shown in FIG. 1, etc.) according to exemplary embodiments.
  • the vest 202 includes including a plurality of infrared (IR) sensors 208 spaced apart from each other along the vest’s front and back over-the-shoulder straps 230 (broadly, portions).
  • the IR sensors 208 may be configured for receiving encoded message(s) sent via a secure IR beam (e.g. , secure IR beam 106 (FIG. 1), etc.) from an IR encoder (e.g., IR encoder 104 (FIG. 1), etc.).
  • a secure IR beam e.g. , secure IR beam 106 (FIG. 1), etc.
  • an IR encoder e.g., IR encoder 104 (FIG. 1), etc.
  • the vest 202 includes a control pack 232.
  • the control pack 232 is positioned along a back of the vest 202.
  • the control pack 232 may be supported by and/or coupled to (e.g., removably attachable/detachable from, etc.) a waist strap 236 (broadly, a portion) of the vest 202.
  • the vest 202 may be relatively lightweight, comfortable to wear, and suitable for all weather conditions and clothing requirements.
  • the IR sensors 208 may be preferably be configured (e.g., spaced apart, oriented, arranged, a sufficient number, etc.) to provide comprehensive IR zone detection around the wearer of the vest 202.
  • the multiple IR sensors 208 along the front and back straps 230 of the vest 202 preferably provide complete 360 degree IR sensing.
  • FIG. 2 shows eight total IR sensors 208 along the front straps 230, e.g., four IR sensors along each front strap 230.
  • the back straps may also include eight total IR sensors 208, e.g., four IR sensors along each back strap.
  • Alterative embodiments may be configured differently, such as having more or less than sixteen total IR sensors, more or less than eight IR sensors along the front and/or back straps, IR sensors located elsewhere (e.g., one or more IR sensors along the waist strap 236, etc.), etc.
  • the number, arrangement, and location of the IR sensors provide complete 360 degree IR sensing.
  • the control pack 232 may include a rechargeable battery pack.
  • the battery pack may be relatively easy to change (e.g., not fixedly attached/integrated into the vest 202, etc. ) and/or comprise a relatively long life battery pack.
  • FIG. 2 shows an example of a vest, harness, or halter 202 that may be used in a personnel safety system (e.g., 100 in FIG. 1, etc.) according to exemplary embodiments.
  • a personnel safety system e.g., 100 in FIG. 1, etc.
  • Other exemplary embodiments may include one or more other portable/wearable items (e.g., hard hat, protective helmet, other headgear, etc.) in addition to, or as an alternative to, a vest, harness, or halter, which other portable/wearable items may include IR sensors and controllers for use in personnel safety systems.
  • portable/wearable items e.g., hard hat, protective helmet, other headgear, etc.
  • FIG. 3 shows infrared (IR) emitters 344 along portions of a machine 340.
  • the IR emitters 344 are configured (e.g., mounted, located, oriented, etc.) to define a first or safe zone 348 and a second or unsafe/shutdown zone 352 relative to the machine 340.
  • the infrared emitters 344 and zones 348, 352 defined thereby may be used in a personnel safety system (e.g., system 100 shown FIG. 1, etc.) for protecting workers or other personnel with automatic position sensing in exemplary embodiments.
  • a personnel safety system e.g., system 100 shown FIG. 1, etc.
  • FIG. 4 shows an integrated IR unit or head 456 that may be used with a personnel safety system (e.g., system 100 in FIG. 1, etc.) according to exemplary embodiments.
  • the integrated IR unit 456 may be used for defining at least a first safe zone relative to a machine.
  • the integrated IR unit 456 may be used to define the first/safe zone 348 relative to the machine 340 shown in FIG. 3.
  • the personnel protection system may be configured to only allow operation (e.g., via safety relay(s), etc.) of the machine 340 if an operator or other personnel is determined to be within the safe zone 348.
  • the integrated IR unit or head 456 may comprise an IR head with integrated emitters 24-32Vdc.
  • the integrated IR unit or head 456 may comprise an IR head with integrated emitters 90-260Vac.
  • FIG. 5 shows an IR controller 560 and three IR emitters 544 that may be used with a personnel safety system (e.g., 100 in FIG. 1, etc.) according to exemplary embodiments.
  • the IR emitters 544 may be mounted at appropriate positions (e.g., along portions of a machine, etc.) to define at least a first safe zone relative to a machine.
  • the IR emitters 544 may be used to define the first/safe zone 348 and the second/unsafe zone 352 relative to the machine 340 shown in FIG. 3.
  • the personnel protection system may be configured to only allow operation (e.g., via safety relay(s), etc.) of the machine 340 if the system determines that an operator or other personnel is within the safe zone 348. But if the system is unable to determine that an operator or other personnel is within the safe zone 348, then the system may be configured to shut down and/or prevent operation of the machine 340 until the system determines that an operator or other personnel is within the safe zone 348.
  • the personnel protection system may also be configured to prohibit operation of or shut down the machine 340 if the system determines that an operator or other personnel is within the unsafe zone 352.
  • FIG. 5 shows three IR emitters 544, more or less than three IR emitters may be used in other exemplary embodiments.
  • the IR controller 560 may comprise an IR controller with three ports 24-32Vdc, etc.
  • FIG. 6 shows an exemplary machine control unit (MCU) 660 that may be used in a personnel safety system ⁇ e.g., FIG. 1, etc.) for controlling machine operation (e.g., shutting down the machine 340 (FIG. 3), etc.) according to exemplary embodiments.
  • the MCU 660 generally includes five N/O (normally open) function relays 1, two N/O function safety relays 2, two C/O (change-over) function safety relays 3, two main contactor safety relays 4a and 4b, two fuses 5a and 5b for the main contactor safety relays 4a and 4b, and terminals 6a and 6b for the main contactor safety relays 4a and 4b.
  • this exemplary embedment includes the MCU 660 having an enhanced safety design with the two main contactor safety relays 4a and 4b, five N/O function relays 1, two N/O function safety relays 2, and two C/O function safety relays 3.
  • a system is configured for providing personnel safety from a machine via automatic position sensing.
  • the system includes an infrared encoder including one or more infrared emitters and configured for sending encoded infrared signals defining at least a first safe zone and a second unsafe/shutdown zone relative to a machine.
  • a portable item is configured to be worn and/or carried by personnel.
  • the portable item includes one or more infrared sensors configured for sensing encoded infrared signals covering the defined first and second zones; an infrared decoder configured to decode the encoded infrared signals; and a radio frequency encoder configured to re-encode the decoded data for transmission as a radio frequency message.
  • the system also includes a radio frequency decoder configured to decode the re-encoded data of the radio frequency message; and an infrared zone decoder configured to determine whether a location of the personnel wearing and/or carrying the portable item is within the first safe zone or the second unsafe/shutdown zone based on the decoded data from the radio frequency decoder.
  • the infrared encoder may be configured to substantially continuously send the encoded infrared signals to define the first safe zone and the second unsafe/shutdown zone relative to the machine, whereby each of the first safe zone and the second unsafe/shutdown zone has a unique infrared code.
  • the infrared encoder may be configured to substantially continuously send encoded message(s) via a secure infrared beam detectable by the one or more infrared sensors of the portable item.
  • the infrared decoder of the portable item may be configured to decode the secure encoded messages received by the one or more infrared sensors.
  • the radio frequency encoder may be configured to re-encode the decoded messages from the infrared decoder, which re-encoded radio frequency messages are transmitted to the radio frequency decoder.
  • the radio frequency decoder may be configured to decode the reencoded radio frequency message for use by the infrared zone decoder in determining whether the location of the personnel wearing and/or carrying the portable item is within the first safe zone or the second unsafe/shutdown zone.
  • the system may be configured to only allow operation of the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the first safe zone and that no personnel wearing and/or carrying the portable item is within the second unsafe/shutdown safe zone.
  • the system may include one or more safety relays configured for shutting down operation of the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the second unsafe/shutdown zone and/or that no personnel wearing and/or carrying the portable item is within the first safe zone.
  • the system may include an integrated infrared unit or head comprising the infrared encoder including the one or more infrared emitters and that is configured for sending encoded infrared signals defining at least the first safe zone and the second unsafe/shutdown zone relative to the machine.
  • the one or more infrared emitters of the integrated infrared unit or head may comprise one or more integrated infrared emitters 24- 32Vdc and/or one or more integrated emitters 90-260Vac.
  • the system may include an infrared controller comprising the infrared encoder and three 24-32Vdc ports.
  • the system may include a machine control unit (MCU) configured for controlling operation of the machine including: shutting down or disabling the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the second unsafe/shutdown zone and/or that no personnel wearing and/or carrying the portable item is located within the first safe zone; and enabling operation of the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the first safe zone and that no personnel wearing and/or carrying the portable item is located within the second unsafe/shutdown zone.
  • MCU machine control unit
  • the machine control unit may comprise one or more N/O (normally open) function relays, one or more N/O function safety relays, one or more C/O (change-over) function safety relays, one or more main contactor safety relays, one or more fuses for a corresponding one or more main contactor safety relays, and one or more terminals for the corresponding one or more main contactor safety relays.
  • N/O normally open
  • N/O function safety relays one or more C/O (change-over) function safety relays
  • main contactor safety relays one or more fuses for a corresponding one or more main contactor safety relays
  • terminals for the corresponding one or more main contactor safety relays.
  • the portable item may comprise a wearable item, such as a vest, haress, or halter to be worn by the personnel.
  • a wearable item such as a vest, haress, or halter to be worn by the personnel.
  • the portable item may comprise a vest including a waistband and front and back straps.
  • the one or more infrared sensors may comprise a plurality of infrared sensors spaced apart along the front and back straps to thereby provide a comprehensive and/or 360 degree infrared zone detection around the wearer of the vest.
  • the vest may include a controller supported by and/or coupled to the waistband of the vest, the controller comprising the infrared decoder and the radio frequency encoder.
  • the controller may include a control pack with a rechargeable battery pack.
  • Exemplary embodiments include methods of providing personnel safety from a machine via automatic position sensing.
  • An exemplary method includes defining at least a first safe zone and a second unsafe/shutdown zone relative to a machine by sending encoded infrared signals; sensing encoded infrared signals covering the defined first and second zones via one or more infrared sensors along a portable item being worn and/or carried by personnel; decoding the encoded infrared signals sensed by the one or more infrared sensors along the portable item; re-encoding the decoded data and transmitting as a radio frequency message; receiving the transmitted radio frequency message and decoding the re-encoded data of the received radio frequency message; and determining whether a location of the personnel wearing and/or carrying the portable item is within the first safe zone or the second unsafe/shutdown zone based on the decoded data of the received radio frequency message.
  • Defining at least the first safe zone and the second unsafe/shutdown zone relative to the machine may comprise substantially continuously sending the encoded infrared signals to define the first safe zone and the second unsafe/shutdown zone relative to the machine, whereby each of the first safe zone and the second unsafe/shutdown zone has a unique infrared code.
  • Defining at least the first safe zone and the second unsafe/shutdown zone relative to the machine may comprise substantially continuously sending encoded message(s) via a secure infrared beam detectable by the one or more infrared sensors of the portable item.
  • the method may include only allowing operation of the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the first safe zone and that no personnel wearing and/or carrying the portable item is within the second unsafe/shutdown safe zone.
  • the method may include: shutting down or disabling the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the second unsafe/shutdown zone and/or that no personnel wearing and/or carrying the portable item is located within the first safe zone; and enabling operation of the machine if it is determined that the location of the personnel wearing and/or carrying the portable item is within the first safe zone and that no personnel wearing and/or carrying the portable item is located within the second unsafe/shutdown zone.
  • the portable item may comprises a wearable item, such as a vest, harness, or halter to be worn by the personnel.
  • a wearable item such as a vest, harness, or halter to be worn by the personnel.
  • the portable item may comprise a vest including a waistband and front and back straps.
  • the one or more infrared sensors may comprise a plurality of infrared sensors spaced apart along the front and back straps to thereby provide a comprehensive and/or 360 degree infrared zone detection around the wearer of the vest.
  • the vest may include a controller supported by and/or coupled to the waistband of the vest.
  • the controller may comprise an infrared decoder, a radio frequency encoder, and a rechargeable battery pack.
  • Exemplary embodiments may include or provide one or more (but not necessarily any or all) of the following features and/or advantages.
  • the exemplary personnel safety systems and methods disclosed herein may provide constant, immediate, and secure personnel safety protection to the wearer.
  • the vest 202 may comprise a relatively lightweight halter or harness system that may be worn constantly/continuously by personnel.
  • the personnel protection systems may provide relatively immediate or instantaneous responses (e.g., machine shutdown, etc.) to zone changes by personnel (e.g., movement from a safe zone to an unsafe zone defined relative to a machine, etc.).
  • Exemplary embodiments may be configured with a PLd protection level via secure IR and RF links.
  • Exemplary embodiments may be configured to be in compliance to EN/ISO 13849 with a Cat3 PLd design, e.g., redundant dual channel hardware design with safety critical firmware, etc.
  • Exemplary embodiments may be configured such that a machine(s) (e.g., machine 340 in FIG. 3, etc.) can only be operated or run when it is determined that an operator is in a safe zone (e.g., safe zone 348 in FIG. 3, etc.) as predefined by IR emitters (e.g., IR emitters 344 in FIG. 3, etc.) and when it is determined that no operator is in an unsafe zone (e.g., unsafe zone 352 in FIG.
  • a safe zone e.g., safe zone 348 in FIG. 3, etc.
  • IR emitters e.g., IR emitters 344 in FIG. 3, etc.
  • IR emitters e.g., IR emitters 344 in FIG. 3, etc.
  • IR emitters e.g., IR emitters 344 in FIG. 3, etc.
  • Exemplary embodiments of the person safety systems disclosed herein may be implemented relatively easily, e.g., via safety rely integration, etc.
  • Exemplary embodiments may be configured to allow for an unhindered operator, e.g., workers) or other personnel may wear a lightweight safety vest (e.g., vest 202 in FIG. 2, etc.) with integrated protection.
  • a lightweight safety vest e.g., vest 202 in FIG. 2, etc.
  • Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well- known processes, well-known device structures, and well-known technologies are not described in detail.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • Spatially relative terms such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

L'invention concerne un système ou procédé servant à protéger des ouvriers de machines à l'aide d'une détection de position automatique. Pour la détection de position automatique, un certain nombre de capteurs infrarouges (IR) est installé sur un gilet, un harnais ou un sanglage (de manière générale, un article pouvant être porté ou dont on peut se vêtir). Les capteurs IR sont configurés pour détecter un faisceau IR codé couvrant une zone sûre délimitée par rapport aux machines. Le gilet comprend un dispositif de commande qui décode le faisceau IR puis réencode les données dans un émetteur radiofréquence (RF). L'émetteur RF transmet un message RF à un récepteur RF. Le récepteur RF est configuré pour traiter le message RF reçu et pour déterminer un emplacement des ouvriers portant le gilet.
PCT/US2020/063603 2019-12-06 2020-12-07 Systèmes et procédés de sécurité de personnel WO2021113815A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201962944997P 2019-12-06 2019-12-06
US62/944,997 2019-12-06

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WO2021113815A1 true WO2021113815A1 (fr) 2021-06-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1947543A1 (fr) * 2006-12-18 2008-07-23 Howard B. Rosen Procédé et appareil pour contrôle à distance sans fil à rayon d'action étendu pour systèmes de conditionnement d'air sans conduit
JP2014047607A (ja) * 2012-09-04 2014-03-17 Aktio Corp 作業機械の安全装置
US20170248272A1 (en) * 2014-10-20 2017-08-31 Robert Bosch Gmbh Safety Garment
KR101785998B1 (ko) * 2017-06-26 2017-10-18 주식회사 썬에이치에스티 안전사고예방을 위한 출입감지시스템
EP3336407A1 (fr) * 2016-12-14 2018-06-20 Stanley Whittaker Appareil pour zone de danger sur le lieu de travail

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1947543A1 (fr) * 2006-12-18 2008-07-23 Howard B. Rosen Procédé et appareil pour contrôle à distance sans fil à rayon d'action étendu pour systèmes de conditionnement d'air sans conduit
JP2014047607A (ja) * 2012-09-04 2014-03-17 Aktio Corp 作業機械の安全装置
US20170248272A1 (en) * 2014-10-20 2017-08-31 Robert Bosch Gmbh Safety Garment
EP3336407A1 (fr) * 2016-12-14 2018-06-20 Stanley Whittaker Appareil pour zone de danger sur le lieu de travail
KR101785998B1 (ko) * 2017-06-26 2017-10-18 주식회사 썬에이치에스티 안전사고예방을 위한 출입감지시스템

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