EP2237841B1 - Crash safety device having a rope drive mechanism - Google Patents
Crash safety device having a rope drive mechanism Download PDFInfo
- Publication number
- EP2237841B1 EP2237841B1 EP08708073.5A EP08708073A EP2237841B1 EP 2237841 B1 EP2237841 B1 EP 2237841B1 EP 08708073 A EP08708073 A EP 08708073A EP 2237841 B1 EP2237841 B1 EP 2237841B1
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- European Patent Office
- Prior art keywords
- securing
- cable
- drive mechanism
- fall
- motor
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- 125000006850 spacer group Chemical group 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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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.
- Such fall protection devices are known in the art, see for example the GB Patent 1552667 and also the EP Patent Application 0 247 818 , These devices have a rotatably mounted in a housing drum for winding and unwinding of the safety rope. When unwinding a return spring is tensioned, which rewinds the rope when the person has released the rope. In the drum there is a blocking device that prevents the further unwinding of the rope, if a person who has connected to the rope suddenly crashes.
- the rope to which the person can connect protrudes through an opening at the lower end of the fall protection device and is provided with a connection hook.
- 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 generally to provide a fall protection device that can do without a leash for pulling down the connection hook and to which a person to be secured can easily connect.
- US 5,762,282 describes a remotely controllable, retractable leash lifter with an attached electric motor to provide powered delivery and retraction of the lifeline to an underlying user.
- the present invention provides a drive mechanism according to claim 1 and a fall arrest device according to claim 16. Preferred embodiments are described in the subclaims and the description.
- a fall arrest device with a wound on a drum safety rope, a return spring to be tensioned when unwinding the rope from the drum, and a locking device for blocking the drum against rotation in Seilabwicklungsraum in the fall of a person secured by the rope, characterized by a cable drive mechanism for unwinding and moving the cable downwardly from the drum, the drive mechanism including a drive motor, a cable drive wheel and a freewheel, and the drive wheel from the motor via the freewheel in a direction to unwind and downwardly move the motor 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 provided with means for switching the direction of motor rotation between the one direction of rotation and an opposite direction of rotation and for setting a predetermined engine speed at least in the opposite direction of rotation to limit the winding speed of the rope by the set engine speed in the opposite direction of motor rotation.
- 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 at 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 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 cable opening (not shown) at the lower end of the housing 110th , 120 out.
- a drum (not shown) is rotatably mounted in the housing 110.
- a return spring (not shown) is tensioned, which later, when the person releases and releases the safety rope, releases the safety rope; pull back up and wind up on the drum.
- the fall arrest device 100 also has a locking mechanism (not shown) that 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 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.
- a hook 290 is attached at the free end of the cable 105.
- 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 to be driven by a motor 140 which is in FIG. 1 is shown 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.
- the FIG. 3A shows the freewheel 200 during slow unwinding or moving down the rope.
- 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 the 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 is responsive and prevents the further unwinding of the rope, ie the crash of the secured person.
- FIG. 3C shows the freewheel 200 with stationary outer ring 202 and rotation of the motor 140 (the shaft 201) counterclockwise, ie the lower end of the rope 105 is connected to a person to be secured and can not move up, the inner shaft 201 rotates freely Counterclockwise, without driving the outer ring 202, the driver 203 slide over the tangential surfaces of the projections 204 away.
- Figure 3D shows the freewheel 200 at released lower end of the safety cable 105.
- the outer ring 202 is now driven by the safety cable 105 in the counterclockwise direction, which is pulled up by the tensioned return spring (not shown) and wound up.
- 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 on the radial catches 203 of the inner shaft 201.
- the spring force of the return spring of the fall arrester is smaller than the force applied to the motor 140 on the drive wheel 210, the ascending speed of the cable 105 adapts to the rotational speed of the drive wheel 210.
- FIGS. 3A, 3B, 3C, 3D only the principle of a freewheel and not the actual construction of the freewheel.
- Freewheels are well known in the art, see eg DE 200 09 895 U1 . 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 exists, as in FIG. 4 shown, from a sleeve 200a having on its inner surface axial recesses 200b with clamping surfaces.
- Clamping bodies 200c such as rollers or needles, are guided in a cage 200e and are located in the recesses 200b.
- the cage 200e has spring elements 200d (shown schematically as helical springs) for pressing the clamping bodies 200c against the clamping surfaces and also against the shaft 201.
- spring elements 200d shown schematically as helical springs
- 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 plastic body or outer ring which is arranged 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-controlled 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 this shows a block diagram of the electrical control of the fall arrest device according to the invention with cable drive mechanism. It consists of the busbars / supply cable 10 or the alternative control via a radio remote control 20, from the Hubendschalter 30 (190 in FIG. 2 ), the relay switching logic 10, a single - phase frequency converter 50, and an asynchronous three - phase motor (40 in FIG. 1 ).
- the busbars / supply cable 10 form the electrical interface for power supply and the control of fall protection.
- the main current is supplied by a 1 phase network with 230 VAC and protective conductor (L1 + N + PE).
- a control signal is transmitted to the relay logic 40. 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.
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Description
Die Erfindung bezieht sich auf ein Absturzsicherungsgerät mit einem Sicherungsseil, das im Falle eines Absturzes einer gesicherten Person blockierbar ist. Desweiteren betrifft die Erfindung einen Antriebsmechanismus für ein Sicherungsseil eines Absturzsicherungsgerätes.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.
Solche Absturzsicherungsgeräte sind im Stand der Technik bekannt, siehe z.B. die
Das bekannte Absturzsicherungsgerät, manchmal auch als Höhensicherungsgerät bezeichnet, hängt üblicherweise an der Decke einer Fabrikhalle oder dergleichen, und der Anschlusshaken des Gerätes befindet sich normalerweise in oberster Stellung bedingt durch die interne Rückholfeder des Gerätes. Zum Erreichen des Anschlusshakens hängt üblicherweise eine Leine an dem Anschlusshaken, mittels welcher das Seil nach unten zu ziehen und das Sicherungsseil abzuwickeln ist, damit die zu sichernde Person sich an das Gerät anschliessen kann. Die herkömmliche Leine behindert permanent die Arbeit in der Fabrikhalle. Der Anschlusshaken könnte auch mittels eines Hubsteigers erreicht werden, aber diese Möglichkeit wäre besonders aufwendig.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.
Aufgabe der Erfindung ist es allgemein ein Absturzsicherungsgerät zu schaffen, das ohne Leine zum Herunterziehen des Anschlusshaken auskommen kann und an das sich eine zu sichernde Person einfach anschliessen kann.The object of the invention is generally to provide a fall protection device that can do without a leash for pulling down the connection hook and to which a person to be secured can easily connect.
Die vorliegende Erfindung stellt einen Antriebsmechanismus nach Anspruch 1 sowie ein Absturzsicherungsgerät nach Anspruch 16 zur Verfügung. Bevorzugte Ausführungsformen sind in den Unteransprüchen und der Beschreibung beschrieben.The present invention provides a drive mechanism according to
Allgemein beschrieben wird ein Absturzsicherungsgerät mit einem auf eine Trommel aufgewickelten Sicherungsseil, einer Rückholfeder, die beim Abwickeln des Seiles von der Trommel zu spannen ist, und einer Sperrvorrichtung zum Blockieren der Trommel gegen Rotation in Seilabwicklungsrichtung beim Absturz einer durch das Seil gesicherten Person, gekennzeichnet durch einen Seilantriebsmechanismus, um das Seil von der Trommel abzuwickeln und von dem Gerät nach unten zu bewegen, wobei der Antriebsmechanismus einen Antriebsmotor, ein Seilantriebsrad und einen Freilauf aufweist, und das Antriebsrad vom Motor über den Freilauf in einer Drehrichtung zum Abwickeln und nach unten Bewegen des Seiles anzutreiben ist.Generally described is a fall arrest device with a wound on a drum safety rope, a return spring to be tensioned when unwinding the rope from the drum, and a locking device for blocking the drum against rotation in Seilabwicklungsrichtung in the fall of a person secured by the rope, characterized by a cable drive mechanism for unwinding and moving the cable downwardly from the drum, the drive mechanism including a drive motor, a cable drive wheel and a freewheel, and the drive wheel from the motor via the freewheel in a direction to unwind and downwardly move the motor Rope is to drive.
Mit dem erfindungsgemässen Gerät kann per Knopfdruck der Anschlusshaken abgesenkt werden.With the device according to the invention, the connection hook can be lowered by pressing a button.
Um die Antriebskraftübertragung von dem Antriebsrad auf das Seil zu verbessern, hat der Seilantriebsmechanismus vorzugsweise ein Anpressrad und das Seil ist durch einen Spalt zwischen dem Antriebsrad und dem Anpressrad hindurchgeführt und ist in dem Spalt in reibungsschlüssiger Berührung mit beiden Rädern. Vorzugsweise ist der Anpressdruck des Anpressrades einstellbar. Das Antriebsrad kann an einem schwenkbaren Hebel drehbar gelagert sein, und der Hebel durch Federkraft vorgespannt sein, um das Anpressrad an das Seil anzudrücken.To improve the drive force transmission from the drive wheel to the cable, 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. Preferably, 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.
Gemäss einem vorteilhaften Ausführungsbeispiel ist der Motor mit einer Einrichtung versehen zum Umschalten der Motordrehrichtung zwischen der einen Drehrichtung und einer entgegengesetzten Drehrichtung und zum Einstellen einer vorbestimmten Motordrehzahl mindestens in der entgegengesetzten Drehrichtung, um die Aufwickelgeschwindigkeit des Seiles durch die eingestellte Motordrehzahl in der entgegengesetzten Motordrehrichtung zu begrenzen. Vorzugsweise ist der Motor ein Drehstrommotor mit einem Steuerkreis zum Umschalten der Motordrehrichtung und zum Einstellen einer vorbestimmten Motordrehzahl in beiden Drehrichtungen. Durch die eingestellte Motordrehzahl im Rückwärtslaufbetrieb (entgegengesetzte Drehrichtung) wird das Hochschnellen des Seiles verhindert oder begrenzt und das Seil nur so schnell hochgefahren wie es der eingestellten Motordrehzahl entspricht. Vorzugsweise ist der Motor ein Dreiphasen-Asynchrondrehstrommotor, dessen Drehzahl in beiden Drehrichtungen über einen Frequenzumrichter einstellbar ist.According to an advantageous embodiment, the motor is provided with means for switching the direction of motor rotation between the one direction of rotation and an opposite direction of rotation and for setting a predetermined engine speed at least in the opposite direction of rotation to limit the winding speed of the rope by the set engine speed in the opposite direction of motor rotation. Preferably, 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 (opposite direction of rotation) prevents or limits the rocking of the rope and only raises the rope as fast as it corresponds to the set engine speed. Preferably, the motor is a three-phase asynchronous three-phase motor whose speed is adjustable in both directions of rotation via a frequency converter.
Um zu verhindern, dass das Seilende beim Aufwickeln nach oben aus dem Spalt zwischen dem Antriebsrad und dem Anpressrad herausgezogen wird ist vorzugsweise ein Anschlag unterhalb des Antriebsrades angeordnet und am Seil ist ein Abstandhalter befestigt, zur Anlage an dem Anschlag wenn das Seil eine obere Endlage erreicht. Der Anschlag kann gleichzeitig als Endschalterbetätiger dienen.In order to prevent that the cable end is pulled out of the gap between the drive wheel and the Anpressrad when winding up a stop is preferably arranged below the drive wheel and the rope is a spacer attached to the stop at the stop when the rope reaches an upper end position , The stop can also serve as limit switch actuator.
Der Motor kann über Funk oder über eine Stromschiene gesteuert werden.The motor can be controlled by radio or via a busbar.
Im Folgenden wird die Erfindung ausführlicher beschrieben in Bezug auf die zugehörigen Zeichnungen, es zeigen:
-
eine perspektivische Darstellung des erfindungsgemässen Absturzsicherungsgerätes mit Seilantriebsmechanismus.Figur 1 -
eine Vorderansicht des Gerätes nachFigur 2 mit geöffnetem Gehäuse des Antriebsmechanismus zur Darstellung der inneren Bauteile derselben.Figur 1 -
schematische Darstellungen des Freilaufs zur Erklärung der Betriebsweise des Gerätes. 3A, 3B, 3C und 3DFiguren -
Figur 4 eine schematische Darstellung eines Hülsenfreilaufs, und -
Figur 5 das Blockschaltbild der elektronischen Steuerung des Antriebsmotors.
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FIG. 1 a perspective view of the inventive fall protection device with cable drive mechanism. -
FIG. 2 a front view of the device afterFIG. 1 with open housing of the drive mechanism for the representation of the internal components thereof. -
FIGS. 3A, 3B, 3C and 3D schematic diagrams of the freewheel to explain the operation of the device. -
FIG. 4 a schematic representation of a sleeve freewheel, and -
FIG. 5 the block diagram of the electronic control of the drive motor.
Wie in den
In dem Gehäuse 110, 120 ist eine Trommel (nicht dargestellt) drehbar gelagert. Wenn eine Person, die sich an das Sicherungsseil 105 anschliessen will, das Seil nach unten zieht und von der Trommel abwickelt, wird eine Rückholfeder (nicht dargestellt) gespannt, die das Sicherungsseil später, wenn die Person sich von dem Seil löst und dieses freigibt, wieder nach oben zieht und auf die Trommel aufwickelt. Das Absturzsicherungsgerät 100 besitzt auch einen Sperrmechanismus (nicht dargestellt), der eine Rotation der Trommel zum Abwickeln des Seiles zulässt, wenn das Seil mit geringer Geschwindigkeit langsam nach unten gezogen wird, aber eine Rotation im Sinne des Abwickelns des Sicherungsseiles 105 blockiert, wenn das Seil mit hoher Geschwindigkeit nach unten gezogen wird, wie beim Absturz einer am Sicherungsseil 105 angeschlossenen Person. Oben am Gehäuse 110, 120 befindet sich ein Aufhänger 115.In the
Ein Absturzsicherungsgerät mit diesen Merkmalen ist im Stand der Technik bekannt aus den eingangs genannten Druckschriften und wird deshalb hier nicht ausführlicher beschrieben.A fall protection device with these features is known in the art from the aforementioned Publications and will therefore not be described in more detail here.
Unter dem Trommelgehäuse 110, 120 ist ein Seilantriebsmechanismus gemäss der Erfindung befestigt. Der Seilantriebsmechanismus hat ein Gehäuse 170, 180, das am Trommelgehäuse 110, 120 über einen Zwischenrahmen oder eine Zwischenplatte 130 befestigt sein kann. Der Seilantriebsmechanismus hat ein Antriebsrad 210 und ein Gegendruck- oder Anpressrad 220, die in einem Gehäuse 180, 170 gelagert sind. Das Sicherungsseil 105 erstreckt sich von dem Trommelgehäuse 110, 120 senkrecht nach unten durch das Gehäuse 170, 180 und ist durch den Spalt zwischen dem Antriebsrad 210 und dem Gegendruckrad 220 hindurchgeführt und ist in dem Spalt in Reib- oder Friktionsberührung mit den Rädern 210, 220 zur Antriebskraftübertragung. Das Sicherungsseil 105 erstreckt sich unter den Rädern 210, 220 durch einen Führungsring 260, der an der Unterseite des Gehäuses 170, 180 befestigt ist. Am freien Ende des Seiles 105 ist ein Haken 290 befestigt. Über dem Haken 290 befindet sich ein Abstandhalter 270, der sich auf dem Haken 290 abstützt.Under the
In der oberen Endlage ist der Abstandhalter 270 in dem Führungsring 260 aufgenommen und liegt mit seinem oberen Ende an einem Anschlag 280 an, durch den das Seil hindurchgeführt ist, und der sich in dem Gehäuse zwischen dem Führungsring 260 und dem Räderpaar 210, 220 befindet. Auf diese Weise wird verhindert, dass beim Aufwickeln des Seiles 105 dieses nach oben aus dem Spalt zwischen den Rädern 210 und 220 herausgezogen werden kann. Vorzugsweise ist der Anschlag 280 gleichzeitig eine Endschalterbetätigung und besteht aus einem an seinem rechten Ende drehbar gelagerten Hebel, der einen Endschalter 190 betätigt, wenn der Abstandhalter 270 mit dem Anschlag 280 in Berührung kommt.In the upper end position of the
In dem Gehäuse 170, 180 befindet sich auch ein weiterer Hebel oder eine schwenkbar gelagerte L-förmige Wippe 230, an der das Gegendruckrad 220 drehbar gelagert ist. Eine Druckfeder 240 drückt das Gegendruckrad 220 gegen das Antriebsrad 210 zum Einklemmen oder Einspannen des Sicherungsseiles 105 zwischen diesen beiden Rädern. Ein Anpressdruckeinstellmechanismus 250 ist am freien Ende der Feder 240 vorgesehen und besteht aus einer Einstellschraube mit Schraubenmutter, wobei die Schraube durch eine Öffnung in einem Winkelstück hindurchragt, das am Gehäuse 170, 180 befestigt ist. Das Gegendruckrad 220 hat vorzugsweise einen Gummi oder Kunststoffkörper.In the
Das Antriebsrad 210 ist durch einen Motor 140 anzutreiben, der in
Gemäss der Erfindung wird das motorgetriebene Antriebsrad 210 über einem Freilauf 200 angetrieben, der die Antriebskraft zum langsamen Abwickeln des Seiles 105 vom Antriebsmotor 140 auf das Antriebsrad überträgt.According to the invention, the motor driven
Im Folgenden wird Bezug genommen auf die
Die
Die
Wie schon erwähnt zeigen die
Gemäss dem bevorzugten Ausführungsbeispiel soll verhindert werden, dass das Seil mit maximaler Geschwindigkeit durch die Rückholfeder aufgewickelt wird wenn die gesicherte Person das Sicherungsseil 105 freigegeben hat, da sonst das Seil 105 nicht richtig auf die Seiltrommel (nicht dargestellt) aufgewickelt wird und der Abstandhalter 270 ungebremst in Endstellung fahren würde, und die Rückholfeder (nicht dargestellt) beschädigt werden könnte.According to the preferred embodiment to prevent the rope is wound at maximum speed by the return spring when the secured person has released the
Vorzugsweise wird dies erreicht durch Verwendung eines Asynchrondrehstrommotors 140 dessen Drehzahl in beiden Drehrichtungen einstellbar ist. Die Umkehr der Drehrichtung erfolgt durch einen Frequenzumrichter. Ein solcher Motor mit Umrichter und Drehzahlregelung ist im Stand der Technik allgemein bekannt und kann von der Firma Lenze (Motortyp MDERRAXX 071-12) bezogen werden. Im Vorwärtslaufbetrieb wird das Seil 105 nach unten bewegt entsprechend der eingestellten Motordrehzahl. Im Rückwärtslaufbetrieb verhindert der mit eingestellter Drehzahl laufende Motor, dass das Seil 105 durch die Rückholfeder zu schnell hochgezogen wird und hart an dem Endanschlag anschlägt. Die Aufwickelgeschwindigkeit des Seiles im Rückwärtslaufbetrieb des Motors 140 ist also begrenzt durch die vorgegebene Geschwindigkeit des Motors 140.Preferably, this is achieved by using an asynchronous three-
Die Stromschienen / Einspeisekabel 10 bilden die elektrische Schnittstelle zur Leistungseinspeisung sowie der Steuerung der Absturzsicherung. Als Hauptstrom wird ein 1 Phasennetz mit 230 VAC und Schutzleiter eingespeist (L1 + N + PE).The busbars /
Zum Senken des Sicherungsseils 105 wird ein Steuersignal an die Relaislogik 40 übertragen. Dieses kann über die Stromschienen / Einspeisekabel 10 erfolgen. Alternativ kann dieses über eine Funkfernsteuerung 20 übermittelt werden. Die Steuerung 20 ist eine handelsübliche Funkfernsteuerung nach dem Stand der Technik.To lower the
Als Rückmeldung wird ein Steuersignal übertragen, wenn der Endschalter 30 (190 in
Die Relaissteuerung 40 besteht aus zwei handelsüblichen Relais. Ein Relais ist für die Übermittlung des Steuersignals "Senken", das andere für die Übermittlung des Steuersignals "Heben" an den Frequenzumrichter 50 zuständig. Der Frequenzumrichter ist eine Einrichtung oder ein Steuerkreis zum Umschalten zwischen Rechts- oder Linkslauf und zum Einstellen einer gewünschten Drehzahl in beiden Laufrichtungen. Eingangsignale der Relaissteuerung 40 sind das Signal "nicht oben" des Hubenschalters 30, sowie das Steuersignal "Senken" von 10 bzw 20. Tabelle 1 zeigt die Zustände der Relaissteuerung.
In 50 ist ein handelsüblicher Einphasenfrequenzumrichter dargestellt. Als Energieeinspeisung wird von den Stromschienen / Einspeiskabel 10, die Energie übermittelt. Intern wird die Wechselspannung über einen Gleichrichter in eine Gleichspannung umgewandelt, welche den Gleichstromzwischenkreis speist. Aus dem Gleichstromzwischenkreis wird ein variables Dreiphasen Drehfeld erzeugt. Das Drehfeld ist abhängig von Steuerbefehl Heben bzw. Senken ein Rechts- bzw. ein Linksdrehfeld. Die Frequenz und die Spannung sind abhängig von der vorgewählten Geschwindigkeit. Die Geschwindigkeitsvorwahl wird in dem Frequenzumricher eingestellt. An den digitalen Eingängen liegt abhängig von der Ansteuerung der Relaissteuerung 40, das Steuersignal Heben bzw. Senken an. Den Steuersignalen können unterschiedliche Werte zugeordnet werden. Um den mechanischen Verschleiß bei ganz abgewickeltem Seil zu minimieren, wird anhand der Strombegrenzung das mechanisch wirkende Antriebsmoment begrenzt. Wird der Grenzwert der eingestellten Stromgrenze überschritten, wird trotz anstehendem Senksteuerbefehl kein Senkdrehfeld vom Frequenzumrichter ausgegeben.50, a commercially available single-phase frequency converter is shown. As power supply is the power rails /
Der Asynchrondrehstrommotor 60 ist ein Handelsüblicher Dreiphasen Drehstrommotor mit Temperaturüberwachungssensor. Der Temperaturüberwachungssensor wird in dem Frequenzumrichter 50 überwacht und schaltet im Fehlerfall den Antrieb ab.The asynchronous three-
Claims (16)
- A drive mechanism for the securing cable (105) of an anti-fall securing unit (100), wherein the anti-fall securing unit has a drum onto which the securing cable is to be wound, a restoring spring which is to be stressed when the securing cable is unwound from the drum and a locking device for blocking the drum against rotation in the securing cable unwinding direction in the case of a fall by a person secured by the securing cable, wherein the drive mechanism has a drive motor (140) and a securing cable drive wheel,
characterised in that
the drive mechanism has a freewheel (200), wherein the securing cable drive wheel is to be moved in a rotational direction by the motor via the freewheel in order to advance the securing cable in a direction corresponding to the unwinding direction of the securing cable from the drum. - The drive mechanism for the securing cable (105) of an anti-fall securing unit (100) according to claim 1, characterised in that the drive mechanism further comprises a pressing wheel (220), and the securing cable is fed through a gap between the cable drive wheel and the pressing wheel and is in the gap in frictional contact with the wheels (210,220).
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 2, characterised in that the pressing wheel is pressed by means of spring pressure, wherein the spring pressure is preferably adjustable.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 2 or 3, characterised in that the pressing wheel is rotatably mounted on a pivotable lever, and the lever is prestressed by means of spring force in order to press the pressing wheel against the securing cable.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 1, characterised in that the motor is provided with a device for switching the motor speed between the one rotational direction and an opposite rotational direction and for setting a predefined motor speed at least in the opposite rotational direction in order to limit the movement speed of the securing cable in the opposite direction by means of the set motor speed.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 5, characterised in that the motor is a three-phase motor with a control circuit for switching the rotational direction of the motor and for setting a predefined motor speed in both rotational directions.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 6, characterised by a frequency converter (50) for setting the motor speed in both rotational directions.
- The drive mechanism for the securing cable of an anti-fall securing unit according to one of claims 1 to 7, characterised in that a stopper (280) is arranged beneath the cable drive wheel, and a spacer is attached to the securing cable for abutting the stopper if the end of the securing cable reaches an end position.
- The drive mechanism for a securing cable of an anti-fall securing unit according to claim 8, characterised in that the stopper is a limit switch actuator.
- The drive mechanism for the securing cable of an anti-fall securing unit according to one of claims 1 to 9, characterised in that the motor can be controlled by means of radio communication or by means of a bus bar.
- The drive mechanism for the securing cable of an anti-fall securing unit according to one of claims 1 to 10, characterised in that the freewheel is a component of the cable drive wheel and the cable drive wheel is mounted above the freewheel on the motor shaft or on a shaft driven by the motor.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 1 or 11, characterised in that the cable drive wheel has a rubber or plastic body, which is mounted on the freewheel.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 2, characterised in that the pressing wheel has a rubber or plastic body.
- The drive mechanism for the securing cable of an anti-fall securing unit according to one of claims 1 to 13, characterised in that the drive mechanism has a housing (110, 120), which is to be attached to an anti-fall securing unit under same, that the securing cable is guided through the housing, and the cable drive wheel and freewheel are disposed within the housing.
- The drive mechanism for the securing cable of an anti-fall securing unit according to claim 24, characterised in that a guide ring (260) for the spacer is provided on a housing of the drive mechanism.
- An anti-fall securing unit (100) comprising a securing cable (105) wound onto a drum, a restoring spring which is to be stressed when the securing cable is unwound from the drum and a locking device for blocking the drum against rotation in the securing cable unwinding direction in the case of a fall by a person secured by the securing cable (105), characterised by a drive mechanism for the securing cable (105) according to one of claims 1 to 15.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/050708 WO2009092438A1 (en) | 2008-01-22 | 2008-01-22 | Crash safety device having a rope drive mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2237841A1 EP2237841A1 (en) | 2010-10-13 |
EP2237841B1 true EP2237841B1 (en) | 2018-06-20 |
Family
ID=39777109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708073.5A Active EP2237841B1 (en) | 2008-01-22 | 2008-01-22 | Crash safety device having a rope drive mechanism |
Country Status (5)
Country | Link |
---|---|
US (2) | US8579086B2 (en) |
EP (1) | EP2237841B1 (en) |
CN (1) | CN101977657B (en) |
BR (1) | BRPI0822197A2 (en) |
WO (1) | WO2009092438A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0822197A2 (en) * | 2008-01-22 | 2015-06-23 | Cti Systems S A | Fall arrest device with cable drive mechanism |
CN103505824A (en) * | 2012-06-29 | 2014-01-15 | 太仓南极风能源设备有限公司 | Electric emergency escape device |
CN103515686B (en) * | 2013-10-16 | 2016-08-10 | 中国电子科技集团公司第三十九研究所 | A kind of braking protection method of non balance weight antenna |
EP2915770B1 (en) * | 2014-03-03 | 2016-10-05 | Actsafe Systems AB | User interface for a portable power driven system |
CN108969926B (en) * | 2018-08-13 | 2020-09-04 | 中冶华天工程技术有限公司 | Safety rope hook with electric control safety device |
CN112043989B (en) * | 2020-09-09 | 2021-08-06 | 廖张涵 | Auxiliary maintenance device for overhead cable for electric power maintenance |
WO2022253395A1 (en) * | 2021-05-31 | 2022-12-08 | Fanø Kran-Service A/S | A combined climbing assistant and fall arrest system |
KR102666529B1 (en) * | 2024-01-11 | 2024-05-16 | 주식회사 티오피이엔씨 | Safety belt |
Citations (1)
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US5762282A (en) * | 1994-10-24 | 1998-06-09 | D B Industries, Inc. | Remote retractable lifeline extender |
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DE2408821A1 (en) * | 1974-02-23 | 1975-09-04 | Schoenknecht Walter | SELF RESCUE DEVICE |
NL164207C (en) * | 1974-07-18 | 1980-12-15 | Lassche Jakob | ESCAPE DEVICE PROVIDED WITH A LONG LINE WRAPPED ON A REEL, REEL COUPLED WINCH MECHANISM AND A FREEWHEEL DELAYED DEVICE. |
GB1552667A (en) * | 1977-10-07 | 1979-09-19 | Barrow Hepburn Equip Ltd | Self winding drum |
US4253643A (en) * | 1979-04-23 | 1981-03-03 | Forester Glen R | Escape device |
US4653609A (en) * | 1984-11-30 | 1987-03-31 | Devine Millard J | Controlled descent apparatus |
GB2192679B (en) * | 1986-05-28 | 1989-12-13 | Barrow Hepburn Equip Ltd | Fall-arrest apparatus |
DE4210560C2 (en) | 1992-03-31 | 1998-04-09 | Schaeffler Waelzlager Kg | Sleeve freewheel |
DE4216055C2 (en) | 1992-05-15 | 1997-12-18 | Schaeffler Waelzlager Kg | Sleeve freewheel with storage |
AT400813B (en) * | 1992-08-10 | 1996-03-25 | Bloder Hans | DEVICE FOR ROPING DOWN OR RAISING PERSONS AND / OR LOADS |
DE4442404C2 (en) | 1994-11-30 | 1999-07-01 | Schaeffler Waelzlager Ohg | Anti-rotation device for a plastic cage of a freewheel |
DE19614512C2 (en) | 1996-04-12 | 1999-05-27 | Schaeffler Waelzlager Ohg | Pinch roller freewheel |
FR2751233B1 (en) * | 1996-07-16 | 1998-10-09 | Tractel Sa | AUTOMATIC FALL STOP DEVICE FOR PERSONNEL WORKING AT HEIGHT |
DE19644045C2 (en) | 1996-10-31 | 2002-04-18 | Ina Schaeffler Kg | freewheel |
DE20009895U1 (en) | 2000-06-02 | 2000-11-23 | INA Wälzlager Schaeffler oHG, 91074 Herzogenaurach | Pinch roller overrunning clutch |
DE202004004117U1 (en) * | 2004-03-15 | 2004-05-13 | Greifzug Hebezeugbau Gmbh | Climbing aid for ladders |
GB0507806D0 (en) * | 2005-04-19 | 2005-05-25 | Bm Engineering Uk Ltd | Belay device |
DE102005047020A1 (en) * | 2005-09-30 | 2007-04-05 | Schaeffler Kg | Free wheel clutch, has tongues deflecting in radial direction and contacting body in area of throat, and cage with recesses provided for holding clamping body that is arranged radially outside of spring band in gap |
BRPI0822197A2 (en) * | 2008-01-22 | 2015-06-23 | Cti Systems S A | Fall arrest device with cable drive mechanism |
-
2008
- 2008-01-22 BR BRPI0822197-9A patent/BRPI0822197A2/en not_active Application Discontinuation
- 2008-01-22 WO PCT/EP2008/050708 patent/WO2009092438A1/en active Application Filing
- 2008-01-22 CN CN200880128239XA patent/CN101977657B/en not_active Expired - Fee Related
- 2008-01-22 US US12/864,037 patent/US8579086B2/en not_active Expired - Fee Related
- 2008-01-22 EP EP08708073.5A patent/EP2237841B1/en active Active
-
2013
- 2013-10-25 US US14/063,095 patent/US20140124296A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5762282A (en) * | 1994-10-24 | 1998-06-09 | D B Industries, Inc. | Remote retractable lifeline extender |
Also Published As
Publication number | Publication date |
---|---|
US20110127112A1 (en) | 2011-06-02 |
US8579086B2 (en) | 2013-11-12 |
WO2009092438A1 (en) | 2009-07-30 |
CN101977657A (en) | 2011-02-16 |
EP2237841A1 (en) | 2010-10-13 |
US20140124296A1 (en) | 2014-05-08 |
BRPI0822197A2 (en) | 2015-06-23 |
CN101977657B (en) | 2012-07-04 |
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