EP2040138A1 - Hilfsvorrichtung zur Aufrechterhaltung der Ausrichtung einer Plattform und entsprechende Hebevorrichtung - Google Patents

Hilfsvorrichtung zur Aufrechterhaltung der Ausrichtung einer Plattform und entsprechende Hebevorrichtung Download PDF

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Publication number
EP2040138A1
EP2040138A1 EP08290877A EP08290877A EP2040138A1 EP 2040138 A1 EP2040138 A1 EP 2040138A1 EP 08290877 A EP08290877 A EP 08290877A EP 08290877 A EP08290877 A EP 08290877A EP 2040138 A1 EP2040138 A1 EP 2040138A1
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EP
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Prior art keywords
platform
sub
circuit
orientation
switch
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EP08290877A
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English (en)
French (fr)
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Bruno Patron
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Fixator
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Fixator
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
    • E04G3/28—Mobile scaffolds; Scaffolds with mobile platforms
    • E04G3/30—Mobile scaffolds; Scaffolds with mobile platforms suspended by flexible supporting elements, e.g. cables
    • E04G3/32—Hoisting devices; Safety devices

Definitions

  • the present invention generally relates to the transportation of objects or persons on a platform.
  • the invention relates more particularly to a device for helping to maintain the orientation, in particular of horizontality, of a mobile platform, this device comprising a control circuit able to be connected to a main power supply, said circuit of control being formed of at least two control subcircuits each designed to control an electric motor moving member of the platform acting, one at or near one end of the platform, the other to , or in the vicinity of the other end of the platform, each control sub-circuit comprising at least one means for detecting the orientation of said switch platform, each detection means, which can be fixed in displacement from said platform, being adapted to pass from a closed position of the corresponding control subcircuit, in which the corresponding electric motor unit is powered, to an opening position of said subcircuit t control according to the detected orientation, said detecting means of said sub-circuits detecting, one, an angular displacement of the platform in one direction, the other, an angular displacement in an opposite direction, so whereas, when the platform is oriented in its reference orientation, the two electric motors move the platform and
  • a pod of facade is in the form of a suspended platform and wide enough to hold a few people and equipment.
  • the platform is moved by two electric motors which act at opposite points of the platform and which are controlled so as to allow the rise and / or the descent of the platform.
  • It is known to use as means for detecting the orientation of the platform mercury ampoules mounted solidarity moving the platform. These mercury bulbs are inserted each within a portion of the control circuit, or subcircuit, which controls one of the electric motors to form switch.
  • Each bulb is in the form of a tube into which electrical contact elements of the control sub-circuit, which form the terminals of a switch, open.
  • Each bulb is intended to detect one of the two directions of inclination of the platform.
  • the corresponding sub-circuit When the electrical contact is closed between the terminals of said switch, the corresponding sub-circuit is closed and can pass a current between the main power supply and the associated motor motor.
  • the platform When the platform is horizontal (the reference orientation), the mercury contained in each bulb is distributed continuously around each electrical contact element, which ensures the closure of the electrical contact in the corresponding sub-circuit.
  • the engine controlled by the sub-circuit in which the mercury bulb is inserted can then be supplied with current.
  • the platform is inclined beyond a certain angle, in a given direction, the mercury contained in the bulb for detecting this direction of inclination no longer covers the electrical contact elements. The closing of the electrical contact is then no longer ensured in the control sub-circuit, which causes the stopping of the associated motor electric member.
  • the other electrical engine member continues to act on the end of the displaced platform, which allows the platform to go back to the horizontal.
  • the horizontality of the platform being restored the electrical contact elements of each bulb are covered by the mercury layer and the two motors can continue to move the platform simultaneously.
  • mercury bulbs no longer meet the environmental standards imposed in the industry.
  • EP-A-0300892 is considered to be the state of the art closest to the object of the present invention. It discloses a device for maintaining the horizontality of a mobile platform, this device comprising a control circuit adapted to be connected to a main power supply.
  • the control circuit is formed of two control sub-circuits each designed to control an electric driving member for moving the platform acting, one at one end of the platform, the other at the other end of the platform, each control sub-circuit including means for detecting the orientation of the switch platform.
  • Each detection means solidarisable in displacement of the platform, is able to pass from a closed position of the corresponding control subcircuit, in which the corresponding electrical motor unit is powered, to an open position of the sub-circuit.
  • the detection means of the sub-circuits detecting, one, an angular displacement of the platform in one direction, the other, an angular displacement in an opposite direction, so that whereas, when the platform is oriented in its reference orientation, the two electric motors move the platform and, when the platform is inclined beyond a given angle relative to its reference orientation, one of the two organs electric motors is stopped while the other electric engine continues to move the corresponding end of the platform until the platform returns to its orientat reference ion.
  • the horizontality of the platform is maintained by measuring the inclination of the cable.
  • the object of the present invention is to propose a new device for helping to maintain the orientation of a platform, which comprises no elements incorporating mercury or a conductive liquid and which makes it possible to reliably detect the orientation. of the platform, despite the vibrations of it during its displacement.
  • the invention relates to a device for helping to maintain the orientation, in particular horizontality, of a mobile platform, this device comprising a control circuit capable of being connected to a main power supply, said control circuit being formed of at least two control subcircuits each designed to control an electric motor moving member of the platform acting, one at or near one end of the platform, the other , at or near the other end of the platform, each control sub-circuit comprising at least one means for detecting the orientation of said switch platform, each detection means, solidarisable in displacement of said platform , being able to pass from a closing position of the corresponding control subcircuit, in which the corresponding electrical motor unit is energized, to an opening position of said switching subcircuit.
  • each detecting means forming a switch comprises a solid element, such as a ball, movable between said closed position and said open position of the corresponding control subcircuit, on the one hand, by gravity according to the orientation of the platform, and, secondly, inadvertently, under the effect of vibration for a duration called untimely opening time, and in that each sub-circuit comprises at least one neutralization means of its detecting means forming a switch when passing from said closed position to said opening position of said sub-circuit, said neutralizing means
  • the device according to the invention thus meets environmental standards which recommend not using mercury-containing elements.
  • the device also avoids the problems of appearance of gaseous phase and variation of quality of electrical contact closure that involves the use of a conductive liquid within a detection means or sensor, since the movable conductive element in each sensor of the device according to the invention is a solid element.
  • a means for neutralizing the detecting means forming a switch detection of the orientation of the platform is carried out reliably. .
  • the two detection means associated with the two neutralization means thus make it possible to easily and reliably detect the direction of orientation of the platform relative to the reference orientation.
  • the or each neutralization means is at least in the form of an auxiliary supply, such as a capacitor.
  • auxiliary power supply such as a capacitor
  • the switch or the auxiliary power controls the activation of the relay system and thus the power supply of the electrical member, arranged downstream of the relays, by the main power supply.
  • the auxiliary power supply being a capacitor and the main power supply, to which the device is able to be connected, delivering an alternating current
  • each sub-circuit comprises a diode for charging the capacitor, the diode being conducting towards the capacitor and the capacitor and the diode being separated by the switch.
  • the movable solid element, such as a ball made of conductive material, of each switch orientation detection means is housed in a hollow body, preferably tubular, equipped with at least one connection zone to the corresponding sub-circuit, said solid element being movable inside said body between the connection zone in which said element closes the sub-circuit by electrical contact, and a disconnection zone, according to of the orientation of the body in the secured state to said platform.
  • control circuit comprises at least two pairs of subcircuits, namely, on the one hand, a pair of subcircuits forming a so-called circuit of rise of the platform and, of on the other hand, another pair of subcircuits forming a so-called descent circuit of the platform, said device comprising means for alternately activating the pairs of sub-circuits.
  • each detecting means forming a switch
  • a relay system intended to authorize or not the power supply of the corresponding electrical motor unit to be controlled, the relay system being designed to be activated, either by closing the switch, or by means of neutralization of the switch during an unwanted operation of said switch.
  • the relay system In the activated state, the relay system allows the power supply of the motor power unit by the main power supply. In the deactivated state, this relay system prevents such a supply of said motor power unit.
  • the relay system comprises at least a first relay element, called Triac (Triode Alternating Current, in English), comprising two thyristors mounted head to tail.
  • Triac Triode Alternating Current, in English
  • the relay system comprises at least one second relay element, called OptoTriac, comprising a photon emitter and two thyristors mounted upside down associated with a photon receiver, said second element being disposed between, on the one hand, the assembly formed by the switch and the means of neutralization and, on the other hand, said first relay element.
  • OptoTriac the second relay element
  • the second relay element is disposed between, on the one hand, the assembly formed by the switch and the neutralization means and, on the other hand, said first relay element so as to be activated by closing the switch. or by means of neutralizing the switch, and thus control the activation of the first relay element.
  • the invention also relates to a device for moving up and / or down a platform of the elevating type comprising two electric motors, such as winches, capable of acting, one at or near one end of the platform, the other, to, or in the vicinity of, the other end of the platform, for moving said platform up and / or down, and at least one main power supply for the power supply of the two electric motor units, characterized in that it includes a device for maintaining the orientation of the platform as described above.
  • two electric motors such as winches
  • each switch orientation detection means is in the form of a tube inclined relative to the plane of the platform of an acute angle between 4 and 6 °.
  • a platform elevating device 1, or nacelle the elevating type which comprises two electrical members 3A, 3B engines.
  • the platform lifting device 1 comprises a main power supply 5, delivering an alternating current, for the supply of the two electrical components 3A, 3B motors.
  • the two electric organs 3A, 3B engines are winches.
  • the main power supply 5 and the two electrical components 3A, 3B motors are secured to the frame 11 of the elevating device.
  • the electric motor members 3A, 3B act, one 3A, at the end 1A of the platform 1, via a cable 18A, the other 3B, at the other end 1B of the platform, via a cable 18B, for moving said platform 1 uphill and / or down.
  • the platform lifting device 1 also comprises a support device for maintaining the orientation of the platform 1.
  • the reference orientation to maintain is the horizontality.
  • the support device comprises a control circuit 2 of the two electric motors 3A, 3B.
  • the control circuit 2 comprises a rising circuit 2A, 2B and a descent circuit 2C, 2D described in more detail below.
  • Each of the climb circuits 2A, 2B and descent 2C, 2D comprises two sub-circuits 2A, 2B, 2C, 2D each designed to control one of the two winches 3A, 3B.
  • Each sub-circuit 2A, 2B, 2C, 2D also comprises a detection means 6A, 6B, 6C, 6D of the switch orientation 6A, 6B, 6C, 6D.
  • Each switch 6A, 6B, 6C, 6D is mounted integral with displacement of said platform 1 and is able to pass from a closing position PF of the sub-circuit 2A, 2B, 2C, 2D corresponding to an open position PO of said sub-circuit 2A, 2B, 2C, 2D, depending on the orientation detected.
  • each detecting means 6A, 6B, 6C, 6D forming a switch comprises a solid element, such as a ball, movable between said closed position PF and said open position PO of the sub-circuit 2A, 2B, 2C, 2D control corresponding, on the one hand, by gravity depending on the orientation of the platform, and, secondly, inadvertently, under the effect of vibration for a duration called duration of inadvertent opening, and each sub-circuit 2A, 2B, 2C, 2D comprises at least one means of neutralization 4 of its detecting means forming a switch 6A, 6B, 6C, 6D during the passage from said closing position PF to said position d opening PO of said sub-circuit, this neutralization means 4 being active for a predetermined duration at least equal to the estimated or calculated duration of inadvertent opening of said control sub-circuit 2A, 2B, 2C, 2D resulting from the vibrations.
  • a solid element such as a ball
  • the duration of untimely opening is defined as the duration of opening which results from a rebound of the switch due to the vibrations.
  • an unintentional opening time is a circuit opening time of less than 200 ms.
  • Each detection means 6A, 6B, 6C, 6D is disposed in the sub-circuit 2A, 2B, 2C, 2D such that said detection means 6A, 6B, 6C, 6D form switch 6A, 6B, 6C, 6D between the main power supply and the motor 3A, 3B controlled by the corresponding sub-circuit.
  • the means 6A, 6B and 6C respectively, 6D disposed in these circuits detect, one, an angular displacement of the platform in one direction, the other, an angular displacement in an opposite direction.
  • the detection means 6A detect a clockwise inclination and the detection means 6B detect a counterclockwise inclination.
  • the detection means 6C detect a counter-clockwise inclination and the detection means 6D detect a clockwise inclination.
  • these detection means 6A, 6B, 6C, 6D of the switch orientation are called sensors 6A, 6B, 6C, 6D of inclination or switches 6A, 6B, 6C, 6D because of their switch function when the platform is tilted.
  • each neutralization means 4 is at least in the form of an auxiliary power supply 4 arranged between the main power supply 5 and the electric drive member 3A, 3B controlled by said corresponding subcircuit.
  • the auxiliary power supply 4 is a capacitor.
  • Sub-circuit 2A is described in more detail below. Of course, this description also applies to the other sub-circuits 2B, 2C, 2D.
  • the structures of these four sub-circuits being similar, the components of the sub-circuits 2B, 2C, 2D are identified with the same references as those used for the corresponding components of the circuit 2A (see Figures 1 to 4 ).
  • the sub-circuits 2B, 2C, 2D also comprise, like the circuit 2A, resistors R0, R1, R2, R3 visible to the Figures 1 to 4 but which have not been referenced for a better readability of the figures.
  • Sub-circuit 2A comprises a transformer 20 connected to power supply 5.
  • the switch 6A and the capacitor 4 are arranged on the same branch EF, in parallel with the transformer 20.
  • the branch portion EG also has a diode 9 passing in the direction of the capacitor 4 for charging said capacitor 4.
  • the diode 9 and the capacitor 4 are separated by the switch 6A so that when the switch is closed, the current from the main power supply 5 and rectified by the diode 9 is used to charge the capacitor 4 and, conversely, when the switch 6A is open, the capacitor discharges.
  • the switch 6A and the capacitor 4 are separated by a midpoint G to which is connected the control part of an electronic relay system 8.
  • the electronic relay system 8 extends between, on the one hand, the switch 6A and the capacitor 4 and, on the other hand, another mechanical relay system 23, called a motor relay because connected directly to the connectors of the motor 3A. controlled by said sub-circuit 2A. Since the control part of the electronic relay system 8 is connected to a midpoint G between the switch and the capacitor, the electronic relay system 8 can be activated either by the closing of the switch 6A, 6B or by the auxiliary power supply 4 during inadvertent operation of said switch 6A.
  • mechanical relay By mechanical relay is meant a relay which comprises for its control part an electromagnetic coil and for its switching part a mechanical element such as a switch.
  • electronic relay means a relay which has no mechanical part, the controlled switch function being provided by electronic components.
  • an electronic relay system 8 makes it possible for the switch 6A not to be connected directly to the connectors of the motor power unit 3A, or to the mechanical relay system 23, which receive power 5 at a high intensity. of the order of 1A. Such intensity could damage the switch 6A.
  • the electronic relay system 8 is described in more detail below.
  • the electronic relay system 8 comprises a component 14, called Triac (Triode Alternating Current, in English), formed of two thyristors mounted head to tail.
  • Triac Triode Alternating Current, in English
  • the Triac is a semiconductor device with three electrodes 24, 25, 26.
  • the Triac is able to go from a blocked state to a conductive state in both directions of polarization.
  • the electrodes 24, 25 are called anodes 24, 25 and the electrode 26, called trigger, controls the conductive state of the Triac between the two anodes 24, 25, when said trigger is subjected to a given current of low intensity.
  • the maximum intensity supported by the trigger is 50mA.
  • the anodes 24, 25 of the Triac 14 are connected, one 24, to the mechanical relay 23 of the electric motor unit 3A controlled by this sub-circuit 2A and the other 25 to the power supply 5.
  • the other Mechanical relay 23 terminal is connected to the power supply 5.
  • Trigger 26 of Triac 14 which controls the transition to the conductive state of Anodes 24, 25 of the Triac 14, thus also controls the power supply of the electric motor unit 3A via the motor relay system 23.
  • Activation, by power supply, trigger 26 of the Triac 14 is itself controlled by another component 15, called OptoTriac.
  • the OptoTriac 15 is disposed between, on the one hand, the assembly formed by the switch 6A and the neutralization means 4 and, on the other hand, the Triac 14.
  • the Optotriac comprises a photon emitter 27 and two thyristors 28 mounted head to tail (that is to say a triac), associated with a photon receiver.
  • the photon emitter 27 and the photon receiver have gate function. In other words, the emission of photons controls the transition to the conductive state of the two anodes 7, 10 of the thyristors 28.
  • the trigger 26 of the Triac 14 is connected to the anode 7 of the Optotriac.
  • the other anode 10 of the Optotriac 15 is connected to the transformer 20 via a resistor R2.
  • R2 Preferably, for safety reasons, it is planned to connect the trigger 26 of the Optotriac to the transformer of the power supply 5 via a resistor R3 so that the trigger 26 is not free of potential.
  • the resistor R2 limits the current flowing through the two thyristors 28 in the conductive state and supplying the trigger 26 of the Triac, so as to obtain an intensity sufficient to control the activation of the trigger, but less than a threshold value above 50.degree. beyond which the Triac 14 would be damaged.
  • Trigger 26 of Triac 14 being connected to transformer 20 via resistor R3 only to ensure that gate 26 is connected to a defined potential point, resistor R3 is chosen such that it limits current the crossing, from the main power supply, to a value below the intensity value which controls the trigger 26 of the Triac 14.
  • the activation of the trigger of the OptoTriac is controlled either by the closing of the switch 6A or by the discharge of the capacitor 4. More precisely, the transmitter of the OptoTriac photons 27 is connected to midpoint G between the capacitor 4 and the switch 6A, via a resistor R1.
  • the photon emitter 27 is formed here by a light-emitting diode 27 mounted for a current from the middle point G. When an intensity coming from the midpoint G passes through the light emitting diode it emits photons received by the photon receiver , which controls the conductive state of the anodes 7, 10 of the OptoTriac 15.
  • Trigger triggering 26 of the Triac 14 in turn controls the conductive state of the anodes 24, 25 of the Triac 14.
  • the mechanical relay system 23 is then activated and the motor 3A is powered by the 5 main power supply.
  • a protective arrangement of the Triac 14 formed by a capacitor and a resistor connected to the terminals of the Triac can be provided.
  • the inclination sensor 6A, or switch 6A comprises a hollow body, here a closed tube 13, equipped with a connection zone to the sub-circuit 2A and the movable solid element 12 or connecting member.
  • the member 12 is here a ball, of conducting material, movable inside said tube 13 between the connection zone in which said member 12 closes the sub-circuit 2A by electric contact, and a disconnection zone.
  • the connection zone is here formed by one end of the tube 13, said connection end, in which open two electrical contact elements of the branch portion EG which are disjoint. These electrical contact elements thus form the terminals of a switch of the branch portion EG.
  • the disconnection zone corresponds to the remaining zone of the tube 13 in which the ball is not in contact with said contact elements.
  • connection end when the ball 12 is in abutment against the so-called connection end, the electrical contact is closed between the power supply 5 and the associated motor power unit 3, via the branch portion EG, the electronic relay system 8 and the mechanical relay system 23 of the motor 3A. Conversely, when the ball 12 is not in abutment against this connection end, the electrical contact is open between the power supply 5 and the motor electrical member 3A at the branch portion EG. Said member 12 is movable from one end to the other of the tube 13 depending on the orientation of the tube 13 secured to said platform 1.
  • Such inclination sensors forming switches are marketed by ASSEMTech under the reference TSW30 / 60. These sensors are also called “Tilt / Switch” sensor.
  • the tube of each sensor is provided with fixing orifices (not shown) which facilitate the securing of said sensor to the platform.
  • the movable solid element is in the form of a conductive element having a plurality of conductive teeth in the manner of a comb.
  • Said comb-shaped conductive element is then movably mounted relative to a connection zone to the corresponding sub-circuit which also has a comb-like structure.
  • said movable member is movably mounted between, on the one hand, a closed position in which the teeth come into contact. electrical contact with the corresponding teeth of the connection area, and secondly, an open position in which the teeth of the movable element and the teeth of the connection area are not in electrical contact.
  • a movable element in the form of a comb makes it possible to make the closure of the electrical contact of the sub-circuit more reliable thanks to the plurality of points of contact between the teeth of the movable element and the teeth of the connection zone. .
  • the other sub-circuit 2B of the rise circuit which controls the motor 3B and which is equipped with the sensor 6B, has a similar structure. It is the same subcircuits 2C and 2D of the descent circuit which are equipped respectively with the sensors 6C and 6D and which respectively control the motors 3A and 3B.
  • activation means 17 are in the form of an actuator that can be tilted by the operator, on the one hand, in a direction so as to close a switch 21 arranged between the power supply 5 and the circuit 2A, 2B, and, on the other hand, in the opposite direction so as to close a switch 22 disposed between the power supply 5 and the descent circuit 2C, 2D.
  • closing one of the power supply switches 21, 22 causes the other to open.
  • a neutral position of the actuator 17 in which the two power supply switches 21, 22 are open, which causes the platform to stop.
  • the sensor 6A of the clockwise inclination of the platform is inclined with respect to the plane of the platform 1 by an included angle, in the anti-clockwise, between 4 ° and 6 °.
  • the sensor 6B of the anti-clockwise inclination of the platform 1 is inclined relative to the plane of the platform 1, in the clockwise direction, by an angle between 4 ° and 6 °.
  • both sensors 6A, 6B are thus oriented to form an inverted V.
  • the platform 1 When during its climb, the platform 1 is inclined relative to the reference orientation, the electrical contact is open in the control sub-circuit of the motor electric member which moves the end of the platform located at an altitude higher than the other end of the platform, so as to cause the shutdown of this electrical engine.
  • the ball 12 of the sensor 6A As represented in figure 2 in the case of a clockwise inclination of the platform beyond an angle of 10 °, the ball 12 of the sensor 6A is moved under the effect of gravity along the tube, in a position where it no longer ensures the electrical contact between the two electrical contact elements forming the connection end.
  • the sensor 6A forming a switch is then in the open position PO and the current no longer circulates in the branch portion EG.
  • the capacitor 4 then discharges during a transition time, dependent on the capacity of the capacitor 4, which continues to activate the electronic relay system 8 during this time.
  • the electric motor member 3A continues to be powered during this transition time and then stops, the electronic relay system 8 is no longer activated.
  • the ball 12 of this sensor 6B is still bearing against the corresponding connection end and the motor 3B continues to be powered by the main power supply 5.
  • electronic relay system 8 being activated by the current from the branch portion EG.
  • the engine 3B thus continues to move the end 1B of the platform upwards, which allows the platform 1 to regain its horizontality.
  • the ball 12 of the sensor 6A rests against the connecting end of this sensor 6A.
  • the electronic relay system 8 is activated again and the motor 3A is then powered again.
  • the rise circuit 2A, 2B operates in a similar manner when the platform is inclined in the counter-clockwise direction, the sensor 6B then being open and the sensor 6A remaining closed.
  • the sensor 6C of the anti-clockwise inclination of the platform is inclined with respect to the plane of the platform 1 of an angle included, clockwise, between 4 ° and 6 °.
  • the sensor 6D of the clockwise inclination of the platform 1 is inclined relative to the plane of the platform 1, in the counter-clockwise direction, by an angle of between 4 ° and 6 °.
  • the two sensors 6C, 6D are thus oriented so as to form a V.
  • the electrical contact is open in the control sub-circuit of the electric motor member which moves the end of the platform located at an altitude lower than the other end of the platform, so as to cause the shutdown of this electric motor.
  • the ball 12 of the sensor 6D is moved under the effect of gravity along the tube, in a position where it no longer ensures the electrical contact between the two electrical contact elements forming the connection end.
  • the sensor 6D forming a switch is then in the open position PO and the current no longer circulates in the branch portion EG.
  • the capacitor 4 then discharges during a transition time, dependent on the capacity of the capacitor 4, which continues to activate the electronic relay system 8 during this time.
  • the electric motor member 3B continues to be powered during this transition time and then stops, the electronic relay system 8 is no longer activated.
  • the ball 12 of this sensor 6C is still bearing against the corresponding connection end and the motor 3A continues to be powered by the main power supply 5.
  • relay system 8 being activated by the current from the branch portion EG.
  • the engine 3A thus continues to move the end 1A of the platform down, which allows the platform 1 to regain its horizontality.
  • the ball 12 of the sensor 6D comes back against the connecting end of this sensor 6D.
  • the relay system 8 is activated again and the motor 3A is then powered again.
  • the descent circuit 2C, 2D functions in a similar way when the platform is inclined in the counterclockwise direction, the sensor 6C is then open and the 6D sensor remains closed.
  • the platform is subjected to vibration. These vibrations can generate rebounds of the ball in the sensor and thus inadvertent opening of the switch formed by the sensor.
  • the capacitor makes it possible to neutralize the effect of the unintentional opening of the switch. More precisely, when, following a rebound of the ball, the electrical contact is open in the branch EG, the capacitor discharges and thus supplies the light-emitting diode via the resistor R1. As explained above, the photon emission controls the conductive state of the anodes 7, 10 of the OptoTriac 15, which allows the supply of current, via the resistor R2, trigger 26 of the Triac 14.
  • the neutralization means is a capacitor
  • the activation of a conventional trigger, formed for example by an electrode of a Triac, with the aid of a capacitor, might therefore be unreliable due to the variation of current and the trigger could also be dangerous. be damaged.
  • the photon emitter is indifferent to the current variation, the conductive transition of the OptoTriac anodes is reliably controlled.
  • the capacity of the capacitor is chosen so as to obtain a sufficient duration of neutralization to cover the duration of unintentional opening of the switch, while being sufficiently small so that the stop time of the engine to be stopped is not too long when the platform is inclined.
  • each sub-circuit controlling, one, the electric motor unit 3A up and down and the other, controlling the electric motor member 3B up and down.
  • the inclination sensor of each sub-circuit is mounted so as to take two predefined orientations, which correspond to the orientations of the sensors in the rise and fall circuits as illustrated in FIGS. Figures 1 to 4 .
  • the orientation of each sensor varies between two values depending on the mode of operation, ascent or descent of the elevation device of the platform.
  • the change of orientation of each sensor is controlled by means of the actuator as described above.
  • the operator when the operator wishes to raise the platform, it actuates the actuating member in a given direction which causes, on the one hand, the closing of the power switch between the two sub-circuits and the main power supply and, on the other hand, the orientation of the inverted V sensors.
  • the operator when the operator wishes to lower the platform, it actuates the actuator in the opposite direction, which allows to obtain an orientation of the V-shaped sensors.
  • the main power supply is formed by at least two distinct sub-power supplies which each supply one of the sub-circuits of the rise circuit and / or of the down-path circuit.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
EP08290877A 2007-09-19 2008-09-16 Hilfsvorrichtung zur Aufrechterhaltung der Ausrichtung einer Plattform und entsprechende Hebevorrichtung Withdrawn EP2040138A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0706570A FR2921165B1 (fr) 2007-09-19 2007-09-19 Dispositif d'aide au maintien de l'orientation d'une plateforme et dispositif d'elevation associe

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EP2040138A1 true EP2040138A1 (de) 2009-03-25

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EP08290877A Withdrawn EP2040138A1 (de) 2007-09-19 2008-09-16 Hilfsvorrichtung zur Aufrechterhaltung der Ausrichtung einer Plattform und entsprechende Hebevorrichtung

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EP (1) EP2040138A1 (de)
FR (1) FR2921165B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533487A (en) 1969-04-28 1970-10-13 Joseph Nuzzo Scaffold safety suspension system
EP0300892A1 (de) 1987-07-21 1989-01-25 Michel Cavalieri Sicherheitsvorrichtung für die Winde einer hängenden Arbeitsbühne
FR2872841A1 (fr) 2004-07-12 2006-01-13 Fixator Soc Par Actions Simpli Dispositif support de plate-forme pour l'elevation de charges ou de personnes le long d'un ouvrage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533487A (en) 1969-04-28 1970-10-13 Joseph Nuzzo Scaffold safety suspension system
EP0300892A1 (de) 1987-07-21 1989-01-25 Michel Cavalieri Sicherheitsvorrichtung für die Winde einer hängenden Arbeitsbühne
FR2872841A1 (fr) 2004-07-12 2006-01-13 Fixator Soc Par Actions Simpli Dispositif support de plate-forme pour l'elevation de charges ou de personnes le long d'un ouvrage

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FR2921165B1 (fr) 2009-11-13
FR2921165A1 (fr) 2009-03-20

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