EP2237841A1 - Dispositif de sécurité contre les risques de chute avec mécanisme d'entraînement de câble - Google Patents

Dispositif de sécurité contre les risques de chute avec mécanisme d'entraînement de câble

Info

Publication number
EP2237841A1
EP2237841A1 EP08708073A EP08708073A EP2237841A1 EP 2237841 A1 EP2237841 A1 EP 2237841A1 EP 08708073 A EP08708073 A EP 08708073A EP 08708073 A EP08708073 A EP 08708073A EP 2237841 A1 EP2237841 A1 EP 2237841A1
Authority
EP
European Patent Office
Prior art keywords
rope
drive mechanism
drive
motor
freewheel
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP08708073A
Other languages
German (de)
English (en)
Other versions
EP2237841B1 (fr
Inventor
Jean-Luc Born
Sebastien Close
Frédéric ARENS
Richard Grossmann
Armin Kreuzer
Jean-Claude Dahner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amova Sarl
Original Assignee
CTI Systems SARL
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 CTI Systems SARL filed Critical CTI Systems SARL
Publication of EP2237841A1 publication Critical patent/EP2237841A1/fr
Application granted granted Critical
Publication of EP2237841B1 publication Critical patent/EP2237841B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B1/00—Devices for lowering persons from buildings or the like
    • A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
    • A62B1/08—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brake mechanisms for the winches or pulleys
    • 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

Definitions

  • the invention relates to a fall protection device with a safety rope that can be blocked in the event of a crash of a secured person. Furthermore, the invention relates to a drive mechanism for a safety rope of a fall protection device.
  • fall arrest devices are known in the art, see e.g. GB patent 1552667 and also EP patent application 0 247 818. These devices have a rotatably mounted in a housing drum for up and
  • Tensioning return spring which rewinds the rope when the person has released the rope.
  • a blocking device which further unwinding the
  • the known fall arrest device sometimes referred to as fall arrester, usually hangs on the ceiling of a factory floor or the like, and the connection hook of the device is normally in the uppermost position due to the internal return spring of the device.
  • To reach the connection hook usually hangs a leash on the connection hook, by means of which the rope to pull down and unwind the safety rope, so that the person to be secured can connect to the device.
  • the traditional leash permanently impedes work in the factory floor.
  • the connection hook could also be achieved by means of a Hubsteigers, but this option would be particularly expensive.
  • the object of the invention is therefore a
  • connection hook can get along and to a person to secure can easily connect.
  • the invention provides a fall arrest device with a wound on a drum safety rope, a return spring to tension the unwinding of the rope from the drum, and a locking device for blocking the drum against rotation in Seilabwicklungsraum in the crash of a secured by the rope Person, characterized by a cable drive mechanism to unwind the rope from the drum and to move downwards from the device, wherein the drive mechanism comprises a drive motor, a Seilantriebsrad and a freewheel, and the drive wheel from the engine via the freewheel in a direction of unwinding and To move down the rope is to drive.
  • connection hook can be lowered by pressing a button.
  • the cable drive mechanism preferably has a pressure wheel and the cable is passed through a gap between the drive wheel and the pressure wheel and is in frictional engagement with both wheels in the gap.
  • the contact pressure of the Anpressrades is adjustable.
  • the drive wheel may be rotatably mounted on a pivotable lever, and the lever may be biased by spring force to press the Anpressrad to the rope.
  • the motor is a three-phase motor having a control circuit for switching the motor rotation direction and setting a predetermined motor speed in both directions of rotation.
  • the set engine speed in reverse operation prevents or limits the rocking of the rope and only raises the rope as fast as it corresponds to the set engine speed.
  • the motor is a three-phase asynchronous three-phase motor whose speed is adjustable in both directions of rotation via a frequency converter.
  • a stop is preferably arranged below the drive wheel and the rope is a spacer attached to the stop on the stop when the rope reaches an upper end position .
  • the stop can also serve as limit switch actuator.
  • the motor can be controlled by radio or via a busbar.
  • the invention relates to a drive mechanism for the safety rope of a fall protection device (claims 17 to 31).
  • Figure 1 is a perspective view of the inventive fall protection device with cable drive mechanism.
  • Figure 2 is a front view of the device of Figure 1 with the housing open of the drive mechanism to show the internal components thereof.
  • Figures 3A, 3B, 3C and 3D are schematic representations of the freewheel for explaining the operation of the device.
  • Figure 4 is a schematic representation of a sleeve freewheel
  • Figure 5 is the block diagram of the electronic control of the drive motor.
  • the fall protection device 100 has a housing 110, 120, in which a cable drum (not shown) is rotatably mounted, for winding and unwinding a safety rope 105.
  • the safety rope 105 protrudes through a rope opening (not shown ) at the lower end of the housing 110, 120 addition.
  • a drum (not shown) is rotatably mounted in the housing 110. If a person wishing to attach himself to the safety rope 105 pulls the rope down and unwinds from the drum, a return spring (not shown) is tensioned, which later releases the safety rope as the person releases the rope and releases it; pull back up and wind up on the drum.
  • the fall arrest device 100 also has a locking mechanism (not shown) which permits rotation of the reel to unwind the rope when the rope is slowly pulled down at low speed, but blocks rotation in the direction of unwinding of the safety rope 105 when the rope pulled down at high speed, as in the crash of a person connected to the safety rope 105 person.
  • 120 is a hanger 115.
  • the cable drive mechanism has a housing 170, 180 which may be secured to the drum housing 110, 120 via an intermediate frame or plate 130.
  • the cable drive mechanism has a drive wheel 210 and a counterpressure or pressure wheel 220, which are mounted in a housing 180, 170.
  • the safety cable 105 extends from the drum housing 110, 120 vertically down through the housing 170, 180 and is passed through the gap between the drive wheel 210 and the counter-pressure 220 and is in the gap in frictional or frictional contact with the wheels 210, 220th for driving force transmission.
  • the safety cable 105 extends under the wheels 210, 220 through a guide ring 260 which is secured to the underside of the housing 170, 180. At the free end of the cable 105, a hook 290 is attached. Above the hook 290 is a spacer 270, which is supported on the hook 290.
  • the spacer 270 In the upper end position of the spacer 270 is received in the guide ring 260 and is located at its upper end to a stop 280, through which the cable is passed, and which is located in the housing between the guide ring 260 and the pair of wheels 210, 220. In this way it is prevented that during winding of the rope 105 this can be pulled up out of the gap between the wheels 210 and 220.
  • the stopper 280 is simultaneously a limit switch operation and consists of a rotatably mounted at its right end lever which actuates a limit switch 190 when the spacer 270 comes into contact with the stopper 280.
  • a compression spring 240 pushes the back pressure 220 against the drive wheel 210 for clamping or clamping the safety cable 105 between these two wheels.
  • An Anpress horreinstellmechanismus 250 is provided at the free end of the spring 240 and consists of a set screw with nut, the screw protrudes through an opening in an angle piece which is fixed to the housing 170, 180.
  • the counter-pressure wheel 220 preferably has a rubber or plastic body.
  • the drive wheel 210 is driven by a motor 140, which is shown in Figure 1 and flanged on the back of the housing 170, 180.
  • a terminal box 160 On the front side of the housing 170, 180 is a terminal box 160 to which a radio receiver 150 for controlling the motor is attached.
  • the radio control is not essential to the invention but the engine can also be controlled via a busbar.
  • the motor driven drive wheel 210 is driven via a freewheel 200, which transmits the drive force for slowly unwinding the cable 105 from the drive motor 140 to the drive wheel.
  • the freewheel 200 has a middle shaft 201 which is connected to the rotor of the motor 140, or the motor shaft itself.
  • an outer ring 202 is rotatably mounted on the shaft 201.
  • the shaft 201 has two diametrically opposed, radially outwardly projecting driver 203, with diametrically opposed, inwardly projecting projections 204 of the outer ring 202 cooperate.
  • FIG. 3A shows the freewheel 200 during slow unwinding or downward movement of the cable.
  • the motor 140 drives the middle shaft 201 clockwise.
  • the radial catches 203 of the shaft 201 detect the radial surfaces of the projections 204 of the outer ring 202 and take the outer ring 202 in a clockwise direction. If the rope is sufficiently unwound, a person can connect to the safety rope 105.
  • FIG. 3B shows the freewheel 200 in the event of a crash of a secured person.
  • the outer ring 202 is suddenly driven by the rope 105 at high speed in a clockwise direction.
  • the inner shaft 201 is now stationary (motor does not rotate) and the projections 204 of the outer ring 202 move over the drivers 203 of the inner shaft 201 away.
  • the locking device in the drum housing 110, 120 responds and prevents the further unwinding of the rope, i. the crash of the secured person.
  • FIG. 3C shows the freewheel 200 with the outer ring 202 stationary and the rotation of the motor 140 (the shaft 201) in the counterclockwise direction, i.e., in the counterclockwise direction.
  • the lower end of the cable 105 is connected to a person to be secured and can not move upwards, the inner shaft 201 rotates freely in the counterclockwise direction, without driving the outer ring 202, the driver 203 slide over the tangential surfaces of the projections 204 away.
  • FIG. 3D shows the freewheel 200 with the lower end of the securing cable 105 released.
  • the outer ring 202 is now driven counterclockwise by the securing cable 105, which is pulled up and wound up by the tensioned return spring (not shown).
  • the outer ring 202 now has the tendency to take the inner shaft 201 in the counterclockwise direction over the freewheel 200 by conditioning the radial surfaces of the projections 204 of the Outer ring 202 at the radial catches 203 of the inner shaft 201.
  • the spring force of the return spring of the H ⁇ henschungs experts is less than the force applied to the motor 140 on the drive wheel 210, the rate of rise of the cable 105 adapts to the rotational speed of the drive wheel 210 at.
  • FIGS 3A, 3B, 3C, 3D show only the principle of a freewheel and not the actual construction of the freewheel.
  • Freewheels are well known in the art, see e.g. DE 200 09 895 Ul, DE 42 16 055 C2, DE 42 10 560 C2, DE 196 44 045 C2, DE 44 42 404 C2 and DE 196 14 512 C2.
  • Such a freewheel consists, as shown in Figure 4, of a sleeve 200a having on its inner surface axial recesses 200b with clamping surfaces.
  • Clamping body 200c such as Rollers or needles are guided in a cage 20Oe and are located in the recesses 200b.
  • the cage 20Oe has spring elements 20Od (shown schematically as helical springs) for pressing the clamping bodies 200c against the clamping surfaces and also against the shaft 201.
  • a plurality of recesses 200b (with clamping surfaces), clamping bodies 200c and pressing springs 20Od are of course over the inner circumference of the free-running sleeve 200a or the cage 20Oe arranged distributed.
  • the freewheel 200 may be a component of the drive wheel 210 and the drive wheel 210 may be mounted on the shaft 201 via the freewheel 200 or the freewheel sleeve. For this purpose there are sliding or roller bearings on both sides of the clamp body.
  • the drive wheel 210 has a rubber or KunststoffStoffk ⁇ rper or outer ring which is disposed on the freewheel 200.
  • the rope is wound at maximum speed by the return spring when the secured person has released the safety rope 105, otherwise the rope 105 is not properly wound on the cable drum (not shown) and the Spacer 270 would drive unrestrained in the end position, and the return spring (not shown) could be damaged.
  • asynchronous three-phase motor 140 whose speed is adjustable in both directions of rotation.
  • the reversal of the direction of rotation is done by a frequency converter.
  • a motor with inverter and speed control is well known in the art and can be obtained from the company Lenze (engine type MDERRAXX 071-12).
  • Lenze engine type MDERRAXX 071-12.
  • the speed-locked motor prevents the cable 105 from being pulled up too quickly by the return spring and striking hard against the end stop.
  • the winding speed of the rope in the reverse operation of the motor 140 is thus limited by the predetermined speed of the motor 140.
  • FIG. 5 shows a block diagram of the electrical control of the fall protection device according to the invention
  • Cable drive mechanism It consists of the busbars /
  • the busbars / supply cable 10 form the electrical interface to the power supply and the
  • Control signal to the relay logic 40 transmitted This can be done via the busbars / supply cable 10. Alternatively, this can be done via a radio remote control 20 be transmitted.
  • the controller 20 is a commercially available radio remote control according to the prior art.
  • a control signal is transmitted when the limit switch 30 (190 in Fig. 2) is operated in the upper position. This is transmitted to the power rail / feed cable 10 and is available for further processing in a higher-level controller.
  • the relay control 40 consists of two commercially available relays. One relay is responsible for the transmission of the control signal "sink", the other for the transmission of the control signal "lifting" to the frequency converter 50.
  • the frequency converter is a device or a control circuit for switching between clockwise or anti-clockwise rotation and for setting a desired speed in both directions.
  • Input signals of the relay controller 40 are the signal “not up” of the hump switch 30 and the control signal "sink" of 10 and 20, respectively. Table 1 shows the states of the relay controller.
  • a commercially available single-phase frequency converter is shown.
  • power supply is the power rails / feed cable 10.
  • the energy transmitted Internally, the AC voltage is converted via a rectifier into a DC voltage, which feeds the DC intermediate circuit.
  • a variable three-phase rotating field is generated.
  • the rotating field is dependent on the control command raising or lowering a right- or a left-rotating field.
  • the frequency and the voltage are dependent on the preselected speed.
  • the speed preselection is set in the frequency inverter.
  • the control signals can be assigned different values.
  • the current-limiting drive torque is limited by means of the current limitation. If the limit value of the set current limit is exceeded, no lowering rotary field will be output by the frequency inverter, despite the presence of a lowering control command.
  • the asynchronous three-phase motor 60 is a commercially available three-phase three-phase motor with temperature monitoring sensor.
  • the temperature monitoring sensor is monitored in the frequency converter 50 and switches off the drive in the event of an error.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Emergency Lowering Means (AREA)

Abstract

Ce dispositif de sécurité contre les risques de chute possède : un câble de sécurité (105) enroulé sur un tambour ; un ressort de rappel, qui est tendu lorsque le câble est déroulé du tambour ; et un dispositif de blocage, pour bloquer la rotation du tambour dans la direction de déroulement du câble en cas de chute d’une personne sécurisée par le câble. Il est prévu un mécanisme d’entraînement de câble pour dérouler le câble (105) du tambour et pour déplacer lentement vers le bas l’extrémité du câble, à laquelle est fixé un crochet (290), afin qu’une personne ne puisse pas s’accrocher au câble de sécurité (105). Le mécanisme d’entraînement possède un moteur (140) qui entraîne une roue d’entraînement de câble (210) par l’intermédiaire d’une roue libre (200), afin d’abaisser l’extrémité du câble pourvue du crochet (290). Pour réenrouler le câble, on fait fonctionner le moteur (140) dans le sens de rotation inverse à vitesse de rotation régulée, afin de limiter la vitesse avec laquelle le câble (105) est relevé par le ressort de rappel tendu.
EP08708073.5A 2008-01-22 2008-01-22 Dispositif de sécurité contre les risques de chute avec mécanisme d'entraînement de câble Active EP2237841B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/050708 WO2009092438A1 (fr) 2008-01-22 2008-01-22 Dispositif de sécurité contre les risques de chute avec mécanisme d’entraînement de câble

Publications (2)

Publication Number Publication Date
EP2237841A1 true EP2237841A1 (fr) 2010-10-13
EP2237841B1 EP2237841B1 (fr) 2018-06-20

Family

ID=39777109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708073.5A Active EP2237841B1 (fr) 2008-01-22 2008-01-22 Dispositif de sécurité contre les risques de chute avec mécanisme d'entraînement de câble

Country Status (5)

Country Link
US (2) US8579086B2 (fr)
EP (1) EP2237841B1 (fr)
CN (1) CN101977657B (fr)
BR (1) BRPI0822197A2 (fr)
WO (1) WO2009092438A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101977657B (zh) * 2008-01-22 2012-07-04 Cti系统股份有限公司 带有绳索驱动机构的坠落保险装置
CN103505824A (zh) * 2012-06-29 2014-01-15 太仓南极风能源设备有限公司 电动紧急逃生装置
CN103515686B (zh) * 2013-10-16 2016-08-10 中国电子科技集团公司第三十九研究所 一种无平衡重天线的制动保护方法
DK2915770T3 (en) * 2014-03-03 2017-01-23 Actsafe Systems AB User interface for a portable, motor-driven system.
CN108969926B (zh) * 2018-08-13 2020-09-04 中冶华天工程技术有限公司 一种带电控保险装置的安全绳挂钩
CN112043989B (zh) * 2020-09-09 2021-08-06 廖张涵 一种电力检修用架空线缆的辅助检修装置
WO2022253395A1 (fr) * 2021-05-31 2022-12-08 Fanø Kran-Service A/S Système combiné d'aide à l'escalade et d'arrêt de chute
KR102666529B1 (ko) * 2024-01-11 2024-05-16 주식회사 티오피이엔씨 안전벨트 장치

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Also Published As

Publication number Publication date
CN101977657A (zh) 2011-02-16
EP2237841B1 (fr) 2018-06-20
US20140124296A1 (en) 2014-05-08
US20110127112A1 (en) 2011-06-02
WO2009092438A1 (fr) 2009-07-30
US8579086B2 (en) 2013-11-12
BRPI0822197A2 (pt) 2015-06-23
CN101977657B (zh) 2012-07-04

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