Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
  • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
  • A62B35/0043—Lifelines, lanyards, and anchors therefore
  • A62B35/0075—Details of ropes or similar equipment, e.g. between the secured person and the lifeline or anchor
• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
  • A62B35/0093—Fall arrest reel devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
  • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
  • B66F11/044—Working platforms suspended from booms

Definitions

• Safety system and hoist comprising such a security system
• the invention relates to a safety system for a person working on a platform of a hoist, and a hoist comprising such a security system.
• a short lanyard is used to reduce the risk of platform ejection, particularly when traveling at high speed, or a longer lanyard with shock absorber to limit injury in the event of a fall in height.
• KR20140079069 describes personal protective equipment consisting of a harness, lanyard, shock absorber, carabiner, sensors and loudspeaker.
• a first sensor detects if the carabiner is detached from a receptacle attached to the harness and emits an audible message if this is not the case.
• a second sensor detects whether the shock absorber is relaxed. This device does not detect if the carabiner is attached to an outside anchor point.
• the use of separate sensors for each function makes it a complex and expensive device.
• US6265983 discloses a safety device that detects whether an electrically conductive lanyard loop connecting the operator to the platform is attached and informs the operator if it is not attached. The commands are blocked if the operator is not attached. The detection is carried out by an electric current passing through the lanyard.
• This safety device can easily be disabled by an operator by replacing the lanyard with a short metal cable.
• US2015284231 describes a lifting platform equipped to detect the presence of harnesses in the platform using RFID techniques. This device does not detect if the harnesses are mechanically attached to the platform.
• the invention intends to remedy by proposing a new safety system making it possible to improve the detection of risks for persons in the platform of a lifting machine.
• the invention relates to a safety system for at least one person on a platform of a hoist, comprising a lanyard through which the person is attached to the platform.
• the lanyard has a variable length
• the security system comprises:
• a sensor for measuring the distance between one end of the lanyard attached to the person and one end of the lanyard attached to the platform, a unit for processing the sensor measurement, adapted to transmit information and / or warning signals.
• the position of the operator in the platform of the hoist can be observed and the security system can trigger treatments taking into account the risks incurred.
• such a system may incorporate one or more of the following features, taken in any technically permissible combination:
• the safety system includes a retractor automatically return the lanyard, while the sensor measures the length unwound between the two ends of the lanyard.
• the lanyard is held taut by the self-retracting retractor.
• the measuring sensor is chosen from a multi-turn potentiometer, an optical or magnetic sensor, or a roller.
• the measuring sensor and the sensor measurement processing unit are provided on the lanyard.
• the lanyard is fixed non-detachably to a safety harness equipping the person on the platform.
• the processing unit is adapted to transmit information and / or warning signals to a control unit of the hoist.
• the sensor measurement processing unit is adapted to transmit the information and / or warning signals to a remote electronic device.
• the security system includes a time recording memory of the measurements made by the sensor and lanyard use events.
• At least one information signal comprises an instruction for limiting the possibility of displacement on the ground and / or the movements of an elevating structure of the lifting machine as a function of the value of the distance between the two ends of the vehicle. lanyard.
• the security system is adapted to emit an alert signal when the distance between the two ends of the lanyard is less than a low value corresponding to an attached state of the person but not far from a hanging point.
• the security system is adapted to emit an alert signal when the distance between the two ends of the lanyard is substantially equal to a maximum value corresponding to the maximum length of the lanyard, indicating a state of falling of the person.
• the warning signal is combined with the sending of an instruction to limit or prohibit the ground movement of the hoist and / or movements of a lifting structure of the hoist.
• At least one of the information signals comprises an authorization of the ground movements of the lifting gear with no speed limit when the distance between the two ends of the lanyard is between a low value, corresponding to an attached state of the person but not distant from a hooked point, and an intermediate value greater than the low value, corresponding to an anti-ejection configuration of the person.
• one of the information signals comprises an instruction for limiting the ground movement speed of the hoist when the distance between the two ends of the lanyard is between an intermediate value corresponding to an anti-ejection configuration of the person and an edge value, corresponding to the distance of the person on an edge of the platform.
• one of the information signals includes an instruction to prohibit the ground movement of the hoist and / or the movements of a lifting structure of the hoist when the distance between the two ends of the lanyard is between an edge value corresponding to the distance of the person on an edge of the platform and a maximum value, corresponding to the maximum length of the lanyard.
• the security system is adapted to emit an alert signal if a distance greater than a maximum value corresponding to the maximum length of the lanyard is detected, or if a distance less than a minimum value is detected corresponding to the length of the lanyard fully wound.
• the security system is adapted to emit an alert signal if a period of non-variation of the distance between the two ends of the upper lanyard is detected at a threshold duration.
• the invention also relates to a hoist comprising a lower part, a lifting structure and a platform carried by the lifting structure.
• the hoist comprises at least one safety system according to the above, adapted to be carried by at least one person on the platform, while the processing unit of the safety system is adapted to transmit information and / or warning signals to a control unit of the hoist, adapted to control the functions of the hoist according to the information signals and / or alert received from the security system.
• FIG. 1 is a perspective view of a lifting platform, comprising a platform on which stands a person connected to the platform by a safety system according to the invention, the lifting platform being in the folded configuration;
• FIG. 2 is a view similar to FIG. 1, in an expanded configuration of the aerial platform
• FIG. 3 is a view of a person equipped with a harness and a lanyard belonging to the security system according to the invention
• FIG. 4 is a perspective view of the lanyard of FIG. 3;
• FIG. 5 is a top view of the platform of the aerial platform of Figure 1, which is held a person.
• FIG. 1 represents a lifting platform 1 comprising a lower part including a chassis 3 equipped with ground connection members, such as wheels or tracks.
• the lower part also comprises a turret 5 movable in rotation with respect to the chassis 3 along an axis perpendicular to the axes of rotation of the wheels, an elevating structure 7 and a platform 9 supported by the lifting structure 7.
• the platform 9 comprises a grid floor 90
• the platform 9 is equipped with a control panel 94 allowing a person P present on the platform 9 to control the aerial platform 1, that is to say the displacement of the frame 3 in relation to the ground, the movements of the platform 9 with respect to the chassis, the starts / stops, etc.
• the lifting structure 7 comprises, in this example, a lower arm deploying
• the aerial platform 1 comprises a security system 12 comprising a lanyard 14 through which the person P is attached to the platform 9.
• the lanyard 14 comprises a ribbon 141 forming the physical link between the person P and the platform 9. This ribbon 141 has an end 140, forming a first end of the lanyard 14, attached to an attachment point 96 of the platform 9.
• the lanyard 14 comprises a second end 142, which is attached to a harness 16 fitted to the person P.
• the lanyard 14 makes it possible to avoid a fall of the person P in different configurations of use of the aerial platform 1.
• the lanyard 14 has a variable length
• the security system 12 is equipped with a sensor 18 for measuring the distance L between the two ends of the lanyard 14, and a processing unit 20 for measuring the sensor 18 adapted for transmitting information and / or warning signals.
• This makes it possible to correlate the length of the lanyard 14, and therefore the positioning of the person P in the platform 9, to different safety situations that may arise during the use of the aerial platform 1, to alert or inform the person P carrying the security system 12 of potential hazards or particular situations.
• people working at height are not necessarily familiar with the operation and safety limitations of an aerial work platform, their work and safety are improved.
• the lanyard 14 preferably comprises a self-locking self-locking retractor 144, according to a principle similar to that of motor vehicle seat belts.
• the winder 144 is formed by a hood in which the ribbon 141 is wound by means of a return mechanism, not shown.
• the sensor 18 therefore measures the length of ribbon 141 unwound to know the distance L between the two ends of the loin 14.
• the measuring sensor 18 may be, for example, a multi-turn potentiometer, or an optical or magnetic sensor detecting optical distance marks or metal strips on the ribbon 141, or a roller in contact with the winder 144 and whose rotations are measured, among others.
• the measuring sensor 18 and the processing unit 20 of the sensor measurement are provided on the lanyard 14.
• the sensor 18 is mounted in the winder 144.
• the processing unit 20 is formed by a housing enclosing electrical components connected to the sensor 18.
• the processing unit 20 may advantageously be fixed to the winder 144.
• the lanyard 14 can be removably attached to the harness 16 equipping the person P, for example by means of a quick link forming the end 142.
• This quick link can be connected to the winder 144 and to the treatment unit 20 by a rigid element 146.
• the lanyard 14 may be fixed non-detachably to the harness 16, and be an integral part of this harness 16 as shown in FIG.
• the lanyard 14 is equipped with an independent battery power supply, and an electronic card that incorporates the components of the processing unit 20.
• the housing containing the processing unit 20 includes the battery whose housing is closed by a cache 21.
• the battery electrically supplies the sensor 18, the processing unit 20, and the communication device.
• the security system 12 may comprise a memory for recording the measurements made by the sensor and the events of use of the lanyard 14. This memory dates the variations in length of the lanyard 14, date the clashes or stalls of the run 14 on the platform 9, possible defects, etc., in order to exploit the data for statistical purposes, to improve the taking into account of the values recorded by the sensor 18, to define new security procedures, etc.
• the processing unit 20 can advantageously incorporate this memory
• the lanyard 14, and more generally the security system 12 can operate autonomously, that is to say without connection with the aerial platform 1.
• the security system 12 provides an alert and information function for the person P who wears it, or to the surrounding persons, without changing the parameters of use of the aerial platform 1.
• the security system 12 can send, to the person P, a failure signal of the distance measuring sensor 15 when a distance L less than a minimum value corresponding to the length of the fully wound lanyard 14 is detected. , or in case of detecting a distance greater than a maximum value Lmax, corresponding to the maximum length of the lanyard 14.
• the maximum length of the lanyard 14 is its length when it is fully unwound .
• the lanyard 14 is equipped with a fall indicator or a shock absorber - not shown - and the maximum length of the lanyard 14 is the addition of the length of the lanyard completely unwound and the additional length created by the activation of the fall indicator or the shock absorber.
• an audible signal for example an alarm
• the low value Lcourt can to be equivalent to a few centimeters.
• the security system 12 can also emit an outward warning signal when the length L of the lanyard 14 is substantially equal to the maximum value Lmax, indicating a probable fall of the person P.
• the security system 12 can also emit an alert signal in the event of detecting a period of no variation of the distance L between the two ends of the lanyard 14 greater than a threshold duration.
• This threshold duration may be, for example, thirty seconds. This makes it possible to detect a physical problem of the person P.
• the lanyard 14 may trigger a pre-alarm emitting a recorded message addressed to the person P , telling him to move to stop the alarm.
• the light and / or sound signals may be emitted on the lanyard 14, or on the harness 16 fitted to the person P.
• the housing containing the processing unit 20 may include in particular lights 24 displaying light signals, and a sound transmitter 26 The lights 24 and the sound transmitter 26 are electrically powered by the battery of the lanyard 14.
• warning or information signals may also be sent to a remote electronic device 17 such as a mobile telephone, a computer, a server for relaying this information to a supervisor, a centralized security system of a building site, maintenance or medical intervention teams, etc.
• a remote electronic device 17 such as a mobile telephone, a computer, a server for relaying this information to a supervisor, a centralized security system of a building site, maintenance or medical intervention teams, etc.
• the loin 14 is preferably attached to the person P in the back of it. In some cases, especially if the person P is in front of the control panel 94 and hooked to the attachment point 96, the loin 14 may partially surround the body of the person P.
• the processing unit 20 is adapted to weight the the value measured by the sensor 18 to take account of a particular orientation of the person P, for example by taking into account a margin of error of 20% on the measured value.
• the aerial platform 1 comprises a control unit 22, which includes sensors, processors and software processing all the operating data of the aerial platform 1 to control the displacement means of the elevating structure 7 and the aerial platform 1 compared to the ground.
• the security system 12 comprises a communication device, not shown, for example with or without a wire, enabling communication with the control unit 22.
• This communication device can be advantageously incorporated in the processing unit 20.
• the control unit 22 can implement certain processes according to the information / alerts received from the security system 12.
• the control unit 22 is adapted to control the functionalities of the aerial platform 1 as a function of the signals information received from the security system 12. This may consist of emitting a visual or audible signal, and limiting the possibility of the aerial platform 1 being displaced on the ground and / or the platform 9 being displaced by the lifting structure 7 according to the value of the distance L between the two ends of the loin 14.
• the signal emitted by the security system 12 may include information that the distance L between the two ends of the lanyard 14 is less than the low value Lcourt, indicating that the person probably did not attach the lanyard 14 to the platform. 9.
• the control unit 22 receiving this information then emits a visual or audible signal to induce the person to attach the lanyard 14 when it is in the platform 9.
• this alert transmitted via the signal 15 is combined with the sending, via the signal 15, an instruction prohibiting or limiting the ground movement of the aerial platform 1 and / or the movement of the elevating structure 7.
• the displacement on the ground of the aerial platform 1 generates strong shaking of the platform 9, because of the presence of the elevating structure 7 and the important lever arm between the frame 3 and the platform 9. Therefore, when a person P stands on the platform 9, it is subject to strong instabilities when the ground speed of the aerial platform 1 increases. To avoid being ejected, the person P must be connected to the platform 9 by a short lanyard 14, which allows him only limited movements relative to the hooked point and prevents him from passing over the guard. body 92 in case of violent shocks.
• the signal 15 emitted by the security system 12 thus comprises an authorization of the ground movements of the aerial platform 1 without a speed limit when the distance L between the two ends of the lanyard 14 is between the low value Lcourt and an intermediate value.
• Llong greater than the low value Lcourt, corresponding to an anti-ejection configuration of the person P.
• anti-rejection configuration means a long length length 14 sufficiently short to hold the person P in the platform 9 and prevent it from pass over the railing 92 in case of ejection.
• the length Llong can be less than 1 meter, for example 50 centimeters.
• the person P can direct, through the control panel 94, the aerial platform 1 relative to the ground at the maximum speed provided by the characteristics of the machine.
• the signal 15 may also include an instruction for limiting the ground travel speed of the aerial platform 1 when the distance L between the two ends of the lanyard 14 is between the intermediate value Llong and an edge value Lbord, corresponding to the distance of the person P on an edge of the platform 9, for example in a work situation in which the person P must pass its arms above the railing 92.
• the value Lbord can be, for example, 1, 5 meters.
• the signal 15 can also control a limitation of the possibilities of movement of the platform 9 by the lifting structure 7, in particular in the case of aerial platforms that do not include ground displacement means.
• the signal 15 may also include an instruction prohibiting the ground movement of the aerial platform 1 when the distance L between the two ends of the lanyard 14 is between the edge value Lbord and the maximum value Lmax, since the person P may have left the platform 9 to perform work outside the platform 9, for example on a roof. It can also be a case of a fall if the distance L is substantially equal to the maximum value Lmax.
• This value Lmax can be, for example, 2 meters.
• the signal 15 can also control a prohibition of the possibilities of movement of the platform 9 by the lifting structure 7, in particular in the case of aerial platforms not including means of ground displacement, or authorization only via a dedicated device, for example to bring relief to the person P who has fallen, by setting up a specific movement back to the ground.
• a failure or fault alert is issued and in this case, the signal sent to the control unit 22. It means a failure of the distance measuring sensor 18 and includes a limitation or prohibition of the movements of the aerial platform 1. Optionally, only certain movements such as relief movements, including return to the ground, can be operated.
• the above-mentioned limitations and authorizations may be implemented jointly or independently depending on the programming of the control unit 22.
• these limitations may be implemented in addition to the other limitations theoretically provided for by the control system 22, in particular to limit the speed of movement on the ground when the lifting structure 7 is deployed and the platform 9 is in height.
• the sensor for measuring the length between the ends of the lanyard 14 can measure the length of a cable distinct from the lanyard 14 and stretched parallel thereto.
• the invention is not limited to a turret lift truck and articulated arm as shown in this example, and also applies to all types of aerial work platforms, including telescopic arm lifting structures, scissors and mats vertical and non-self-propelled platforms, mounted on a truck chassis, trailer chassis or industrial truck.

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• Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Emergency Management (AREA)
• Business, Economics & Management (AREA)
• General Health & Medical Sciences (AREA)
• Health & Medical Sciences (AREA)
• Geology (AREA)
• Mechanical Engineering (AREA)
• Emergency Alarm Devices (AREA)
• Forklifts And Lifting Vehicles (AREA)
• Emergency Lowering Means (AREA)
• Control And Safety Of Cranes (AREA)
• Jib Cranes (AREA)

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• 2017
  • 2017-07-31 FR FR1757313A patent/FR3069532B1/fr active Active
• 2018
  • 2018-07-30 CA CA3068957A patent/CA3068957A1/fr active Pending
  • 2018-07-30 US US16/634,767 patent/US11286143B2/en active Active
  • 2018-07-30 WO PCT/EP2018/070558 patent/WO2019025345A2/fr not_active Ceased
  • 2018-07-30 CN CN201880047427.3A patent/CN110914191B/zh active Active
  • 2018-07-30 EP EP18743545.8A patent/EP3661867B1/de active Active
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