EP0076420B1 - Strengthened telescopic jib - Google Patents
Strengthened telescopic jib Download PDFInfo
- Publication number
- EP0076420B1 EP0076420B1 EP82108666A EP82108666A EP0076420B1 EP 0076420 B1 EP0076420 B1 EP 0076420B1 EP 82108666 A EP82108666 A EP 82108666A EP 82108666 A EP82108666 A EP 82108666A EP 0076420 B1 EP0076420 B1 EP 0076420B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- telescopic
- rope
- ropes
- telescopic boom
- load
- 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.)
- Expired
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- 125000006850 spacer group Chemical group 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/16—Mobile or transportable lifts specially adapted to be shifted from one part of a building or other structure to another part or to another building or structure
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/10—Reinforcements for ladders
Definitions
- the invention relates to a telescopic boom, consisting of at least two telescopic sections, between which a locking mechanism preventing the relative movement in the entry direction is provided, one or more cables on the underside of the telescopic boom, guided by spacers, bridging several telescopic sections and the cable or the side with one arranged on the first telescopic section tensioning and rope holding device are connected.
- Such a telescopic boom with an extendable ladder which consists of two or more parts which can be telescoped relative to one another and in which differences in the extension lengths can be compensated for with the aid of additional loose parts such as tensioning beams and chain sections.
- a metal ladder consisting of spars and rungs is also known, which consists of a plurality of composite ladder sections, two ladder sections in each case being stiffened by a rope running underneath via a spacer (GB-A-777 968).
- a transport device for roof tiles which is designed as a cantilever made of individual rail sections, which has support and tension struts on the underside for bracing the cantilever.
- the aforementioned boom is not telescopic (CH-A-396765).
- the invention is directed to a telescopic boom of an inclined elevator.
- These are used, for example, by roofers, construction businesses and the like.
- loads such as bricks, cement or the like are to be brought to a higher level, the telescopic boom being extended so far that its end can be placed on any fixed point.
- the telescopic boom is practically a beam clamped on one side, which also bends accordingly.
- the concave side of the beam therefore faces the floor.
- the free end lies on a fixed point, the situation is reversed, and a support is placed on two supports, so that the convex side now faces the floor.
- the invention seeks to avoid the above-described disadvantages and, even with a greater extension length with smaller dimensions and less material, to achieve a support that is as straight as possible and is therefore not excessively bent on two fixed points.
- the invention is also based on the object of avoiding the use of additional means generating the rope tension, in particular loose parts. The task should be solvable regardless of the respective extension length of the individual telescopic sections.
- the invention achieves the object in that the telescopic boom is designed as an inclined elevator and has guide rails for a load vehicle (load bucket) which can be moved on the upper side thereof, that the tensioning device consists of a winding roll forming a cable storage device , which is provided with a pretensioned drive, and that the winding roll is preceded by a cable holding device which can be actuated by an actuating member from the control station.
- load vehicle load bucket
- the tensioning device consists of a winding roll forming a cable storage device , which is provided with a pretensioned drive, and that the winding roll is preceded by a cable holding device which can be actuated by an actuating member from the control station.
- the rope tension can first be brought about in any way; The only requirement is that the telescopic sections are locked together in the direction of entry.
- the ropes fastened on one side thus run on a pretensioned winding roller; which forms the rope storage, so that with a slightly pretensioned rope (or ropes) a rope bridge is created automatically when the telescopic boom is extended, but this does not yet have a stiffening effect.
- a preload is therefore constantly generated in the telescopic boom during the extension process.
- the cable winding device can by any means, for example pneumatically, electrically by a standstill motor, by hydr. Drives or by spring drives the pretension in the winding direction receive. It is preferably arranged on the first telescopic section.
- An actuating member which is provided in the area of the control station, enables the actuation of the cable holding device.
- the telescopic sections can no longer be displaced relative to one another in the entry direction. Due to the formation of a free beam clamped on one side, the telescopic boom bends downward, so that the rope occupies its shortest position. If the rope (or the ropes) is now fixed according to the invention via holding devices that can be switched on and off before entering the winding roll, the ropes can no longer be extended. If the outer end of the telescopic boom is now placed on a fixed point, the rope forms a chord with respect to the telescopic boom. The telescopic boom remains slightly bent downwards and forms an ideal bridge for the load to be carried on it.
- the penultimate shot and the first shot are expediently bridged by the ropes, which then form a lower chord.
- the rope tension can also be increased in that the rope holding devices are switched on shortly before reaching the locking position, so that the rope receives an additional tension from the last stroke of the relative displacement of the telescopic sections to one another, that is to say from the last extension of the telescopic boom.
- the invention can also be used by slight further measures to force the telescopic sections to retract, in which the winding roll receives an additional drive acting in the winding direction, with which, for example, the shots of the telescopic boom can also be moved relative to one another in the retracting direction if the weight component can no longer be used for this.
- the pre-tension provided in the winding direction can also be selected so that the ropes support a retraction.
- a telescopic boom 1 of an inclined elevator forms guide rails 2 for the movability of a load bucket 3.
- the telescopic sections 4 are fixed in their selected extended position by locking elements 5.
- Two ropes 6 are guided over spacers 7 and form a lower chord 17.
- the spacers 7 are each attached to the ends 9 of the telescopic sections 4 and form a package lying close together in the retracted state.
- the ropes 6 are fixed to stops 10 at the outer end of the penultimate telescopic shot. They run over corresponding guides of the spacers 7 via a cable holding device 14 and guides 13 for the pretensioned winding roll 11, which forms a cable storage device 12.
- the pre-tension can be generated in any way hydraulically, pneumatically, electrically or by a spring mechanism in the winding direction in order to ensure a constant rope tension.
- the spacers 7 increasingly move away from one another and slide - over the rope, which is continuously lengthened by unwinding from the winding roll 11.
- a cable holding device 14 is switched on, which can be designed as a reverse brake, as a cleat or the like in a known manner.
- the ropes 6 now run from the stop 10 below the telescopic boom 1 to the cable holding device 14 on the first telescopic section 16, so that this forms a support 18 stiffened by the lower flange 17 with all telescopic sections up to the penultimate telescopic section. Since the carrier is clamped on one side, it bends like a free rod, depending on the inclined position, so that the ropes 6 form a chord. If the cable holding device 14 is now switched on, this bent position can no longer change significantly.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Jib Cranes (AREA)
- Types And Forms Of Lifts (AREA)
- Tents Or Canopies (AREA)
- Bridges Or Land Bridges (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Teleskopausleger, bestehend aus mindestens zwei Teleskopschüssen, zwischen denen eine die Relativbewegung im Einfahrsinne verhindernde Verriegelung vorgesehen ist, wobei ein oder mehrere Seile unterseitig des Teleskopauslegers, über Abstandshaiter geführt, mehrere Teleskopschüsse überbrücken und das Seil oder die Seite mit einer am ersten Teleskopschuß angeordneten Spann- und Seilhaltevorrichtung verbunden sind.The invention relates to a telescopic boom, consisting of at least two telescopic sections, between which a locking mechanism preventing the relative movement in the entry direction is provided, one or more cables on the underside of the telescopic boom, guided by spacers, bridging several telescopic sections and the cable or the side with one arranged on the first telescopic section tensioning and rope holding device are connected.
Es ist ein solcher Teleskopausleger bei einer verlängerbaren Leiter bekannt, der aus zwei oder mehr zueinander teleskopierbaren Teilen besteht und bei der mit Hilfe von zusätzlichen Losteilen wie Spanntraversen und Kettenabschnitten Differenzen in den Ausfahrlängen ausgeglichen werden können. Mit Hilfe des unterseitig des Teleskopauslegers angeordneten Seiles kann eine unzulässig hohe Durchbiegung bei Benutzung der Leiter - d. h. also durch Begehen von Personen - verhindert werden (DE-U-71 47827). Es ist weiter eine aus Holmen und Sprossen bestehende metallene Leiter bekannt, die aus mehreren zusammengesetzten Leiterabschnitten besteht, wobei jeweils zwei Leiterabschnitte durch ein über einen Abstandshalter unterseitig verlaufendes Seil ausgesteift sind (GB-A-777 968).Such a telescopic boom with an extendable ladder is known which consists of two or more parts which can be telescoped relative to one another and in which differences in the extension lengths can be compensated for with the aid of additional loose parts such as tensioning beams and chain sections. With the help of the rope arranged on the underside of the telescopic boom, an impermissibly high deflection when using the ladder - d. H. So by walking on people - be prevented (DE-U-71 47827). A metal ladder consisting of spars and rungs is also known, which consists of a plurality of composite ladder sections, two ladder sections in each case being stiffened by a rope running underneath via a spacer (GB-A-777 968).
Schließlich ist eine Transporteinrichtung für Dachziegel bekannt, die als ein aus einzelnen Schienenschüssen zusammengesteckter Ausleger ausgebildet ist, welcher unterseitig Stütz- und Zugstreben zur Aussteifung des Auslegers aufweist. Der vorgenannte Ausleger ist nicht teleskopierbar (CH-A-396765).Finally, a transport device for roof tiles is known which is designed as a cantilever made of individual rail sections, which has support and tension struts on the underside for bracing the cantilever. The aforementioned boom is not telescopic (CH-A-396765).
Nach einem noch nicht zum Stand der Technik gehörenden Vorschlag, der sich auf Teleskopausleger für Schrägaufzüge bezieht (deutsche Patentanmeldung P 30 01 410.9), wurde bereits vorgeschlagen, Verriegelungen zwischen dem ersten bis zum vorletzten Teleskopschuß vorzusehen. Diese sind so ausgebildet, daß die Ausfahrlänge praktisch beliebig gewählt werden kann. Eine irgendwie geartete Verriegelung der Teleskopschüsse untereinander ist unabdingbare Voraussetzung für die im folgenden beschriebene Erfindung.According to a proposal that is not yet part of the prior art and relates to telescopic booms for inclined elevators (German patent application P 30 01 410.9), it has already been proposed to provide interlocks between the first and the penultimate telescopic section. These are designed so that the extension length can be chosen practically arbitrarily. Any kind of locking of the telescopic sections among themselves is an essential prerequisite for the invention described below.
Die Erfindung richtet sich auf einen Teleskopausleger eines Schrägaufzuges. Diese werden beispielsweise von Dachdeckern, Baugeschäften und dgl. eingesetzt. Es sollen beispielsweise Lasten, wie Ziegel, Zement oder dgl. auf ein höheres Niveau gebracht werden, wobei der Teleskopausleger soweit ausgefahren wird, daß sein Ende auf irgendeinem Festpunkt aufgelegt werden kann. Bis zum Erreichen dieses oberen Festpunktes ist der Teleskopausleger praktisch ein einseitig eingespannter Träger, der sich auch entsprechend biegt. Die konkave Seite des Trägers zeigt daher zum Boden. Sobald jedoch das freie Ende auf einem Festpunkt aufliegt, kehren sich die Verhältnisse um, und es entsteht ein auf zwei Auflagern aufgelegter Träger, so daß nunmehr die konvexe Seite zum Boden zeigt. Dies ist der Zustand, in dem der Lastkübel mit ggf. erheblichen Lasten auf den durch den Teleskopausleger gebildeten Schienen hochgefahren werden soll. Je kleiner der Winkel zwischen dem Boden und dem Teleskopausleger ist, desto stärker ist die Biegebelastung. Da dieser aber jeweils für die höchste denkbare Belastung ausgelegt sein muß, war es bisher erforderlich, insbesondere bei Schrägaufzügen, ungewöhnlich kräftige und damit teure Konstruktionen zu verwenden. Bei Schrägaufzügen kann die Ausfahrlänge durchaus 40 m betragen. Die Durchbiegung ist also erheblich und verstärkt sich noch unter der Last, insbesondere dann, wenn diese sich etwa in der Mitte zwischen den Auflagerpunkten befindet. Soll die Ausfahrlänge ggf. korrigiert werden, so ist die durch die Belastung erzeugte Verklemmung zwischen den Teleskopschüssen bereits so stark, daß eine Bewegung nicht mehr möglich ist.The invention is directed to a telescopic boom of an inclined elevator. These are used, for example, by roofers, construction businesses and the like. For example, loads such as bricks, cement or the like are to be brought to a higher level, the telescopic boom being extended so far that its end can be placed on any fixed point. Until this upper fixed point is reached, the telescopic boom is practically a beam clamped on one side, which also bends accordingly. The concave side of the beam therefore faces the floor. However, as soon as the free end lies on a fixed point, the situation is reversed, and a support is placed on two supports, so that the convex side now faces the floor. This is the state in which the load bucket is to be raised with possibly considerable loads on the rails formed by the telescopic boom. The smaller the angle between the floor and the telescopic boom, the greater the bending load. However, since this must be designed for the highest conceivable load, it was previously necessary to use unusually strong and therefore expensive constructions, especially in inclined elevators. With inclined lifts, the extension length can be 40 m. The deflection is therefore considerable and increases under the load, especially if it is approximately in the middle between the support points. If the extension length is to be corrected if necessary, the jamming between the telescopic sections caused by the load is already so strong that movement is no longer possible.
Die vorbeschriebenen Nachteile will die Erfindung vermeiden und auch bei größerer Ausfahrlänge bei geringeren Dimensionen und geringerem Materialaufwand einen auf zwei Festpunkten aufliegenden möglichst gestreckten und daher nicht zu stark durchgebogenen Träger erzielen. Der Erfindung liegt weiterhin die Aufgabe zugrunde, die Verwendung zusätzlicher, die Seilspannung erzeugender Mittel, insbesondere von Losteilen zu vermeiden. Die Aufgabe soll unabhängig von der jeweiligen Ausfahrlänge der einzelnen Teleskopschüsse lösbar sein.The invention seeks to avoid the above-described disadvantages and, even with a greater extension length with smaller dimensions and less material, to achieve a support that is as straight as possible and is therefore not excessively bent on two fixed points. The invention is also based on the object of avoiding the use of additional means generating the rope tension, in particular loose parts. The task should be solvable regardless of the respective extension length of the individual telescopic sections.
Ausgehend von dem Stand der Technik nach der eingangs genannten Gattung löst die Erfindung die gestellt Aufgabe dadurch, daß der Teleskopausleger als Schrägaufzug ausgebildet ist und Führungsschienen für ein oberseitig an diesem verfahrbares Lastfahrzeug (Lastkübel) aufweist, daß die Spanneinrichtung aus einer einen Seilspeicher bildenden Wickelrolle besteht, die mit einem in Einfahrrichtung vorgespannten Spannantrieb versehen ist, und daß der Wickelrolle eine über ein Betätigungsglied vom Steuerstand betätigbare Seilhaltevorrichtung vorgeordnet ist. Die Lösung der Aufgabe liegt somit in dem Zusammenwirken von Wickeltrommel und Seilhaltevorrichtung.Based on the prior art according to the type mentioned at the outset, the invention achieves the object in that the telescopic boom is designed as an inclined elevator and has guide rails for a load vehicle (load bucket) which can be moved on the upper side thereof, that the tensioning device consists of a winding roll forming a cable storage device , which is provided with a pretensioned drive, and that the winding roll is preceded by a cable holding device which can be actuated by an actuating member from the control station. The solution to the problem thus lies in the interaction of the winding drum and the rope holding device.
Dabei kann die Seilspannung zunächst auf beliebigem Wege herbeigeführt werden ; Voraussetzung ist nur, daß die Teleskopschüsse in Einfahrrichtung untereinander verriegelt sind.The rope tension can first be brought about in any way; The only requirement is that the telescopic sections are locked together in the direction of entry.
Nach der erfindungsgemäßen Lösung laufen somit die einseitig befestigten Seile auf eine vorgespannte Wickelrolle ; die den Seilspeicher bildet, auf, so daß bei stets leicht vorgespanntem Seil (oder Seilen) von selbst beim Ausfahren des Teleskopauslegers eine Seilbrücke entsteht, die allerdings noch nicht versteifende Wirkung hat. Es wird also bereits während des Ausfahrvorganges ständig eine Vorspannung im Teleskopausleger erzeugt.According to the solution according to the invention, the ropes fastened on one side thus run on a pretensioned winding roller; which forms the rope storage, so that with a slightly pretensioned rope (or ropes) a rope bridge is created automatically when the telescopic boom is extended, but this does not yet have a stiffening effect. A preload is therefore constantly generated in the telescopic boom during the extension process.
Die Seilwickelvorrichtung kann über beliebige Mittel, beispielsweise pneumatisch, elektrisch durch Stillstandmotor, durch hydr. Antriebe oder durch Federantriebe die Vorspannung in Wickelrichtung erhalten. Vorzugsweise ist sie am ersten Teleskopschuß angeordnet. Ein Betätigungsorgan, das im Bereich des Steuerstandes vorgesehen ist, ermöglicht die Betätigung der Seilhaltevorrichtung.The cable winding device can by any means, for example pneumatically, electrically by a standstill motor, by hydr. Drives or by spring drives the pretension in the winding direction receive. It is preferably arranged on the first telescopic section. An actuating member, which is provided in the area of the control station, enables the actuation of the cable holding device.
Wird nun die Verriegelung der Teleskopschüsse untereinander eingeschaltet, können sich die Teleskopschüsse nicht mehr in Einfahrrichtung relativ zueinander verschieben. Durch die Bildung eines einseitig eingespannten freien Trägers biegt sich der Teleskopausleger nach unten ab, so daß das Seil seine kürzeste Position einnimmt. Wird nun erfindungsgemäß über aus- und einschaltbare Haltevorrichtungen das Seil (oder die Seile) vor dem Einlauf in die Wickelrolle festgelegt, können sich die Seile nicht mehr verlängern. Wird nun das äußere Ende des Teleskopauslegers auf einem Festpunkt aufgelegt, so bildet das Seil mit Bezug auf den Teleskopausleger quasi eine Sehne. Der Teleskopausleger bleibt leicht nach unten gebogen und bildet eine ideale Brücke für die auf ihm zu transportierende Last.If the interlocking of the telescopic sections with one another is now switched on, the telescopic sections can no longer be displaced relative to one another in the entry direction. Due to the formation of a free beam clamped on one side, the telescopic boom bends downward, so that the rope occupies its shortest position. If the rope (or the ropes) is now fixed according to the invention via holding devices that can be switched on and off before entering the winding roll, the ropes can no longer be extended. If the outer end of the telescopic boom is now placed on a fixed point, the rope forms a chord with respect to the telescopic boom. The telescopic boom remains slightly bent downwards and forms an ideal bridge for the load to be carried on it.
Zweckmäßigerweise werden der vorletzte Schuß und der erste Schuß durch die Seile überbrückt, die dann einen Untergurt bilden.The penultimate shot and the first shot are expediently bridged by the ropes, which then form a lower chord.
Die Seilspannung kann zusätzlich dadurch erhöht werden, daß die Seilhaltevorrichtungen kurz vor Erreichen der Riegelstellung bereits eingeschaltet werden, so daß das Seil eine zusätzliche Spannung durch den letzten Hub der Relativverschiebung der Teleskopschüsse zueinander, also durch die letzte Verlängerung des Teleskopauslegers erhält.The rope tension can also be increased in that the rope holding devices are switched on shortly before reaching the locking position, so that the rope receives an additional tension from the last stroke of the relative displacement of the telescopic sections to one another, that is to say from the last extension of the telescopic boom.
Die Erfindung läßt sich zusätzlich noch durch geringfügige weitere Maßnahmen dazu nutzen, die Teleskopschüsse zwangsweise einzufahren, in dem die Wickelrolle einen in Aufwickelrichtung wirkenden zusätzlichen Antrieb erhält, mit dem beispielsweise die Schüsse des Teleskopauslegers auch dann relativ zueinander in Einfahrrichtung bewegt werden können, wenn die Gewichtskomponente dazu nicht mehr herangezogen werden kann. Die ohnehin in Aufwickelrichtung vorgesehene Vorspannung kann im übrigen auch so gewählt werden, daß die Seile ein Einfahren unterstützen.The invention can also be used by slight further measures to force the telescopic sections to retract, in which the winding roll receives an additional drive acting in the winding direction, with which, for example, the shots of the telescopic boom can also be moved relative to one another in the retracting direction if the weight component can no longer be used for this. The pre-tension provided in the winding direction can also be selected so that the ropes support a retraction.
Durch die Erfindung ist es nunmehr möglich, bei geringerem Konstruktionsaufwand höhere Lasten über einen derartigen Schrägaufzug zu transportieren, ohne daß die einzelnen Schüsse in ihren Überlappungen zu stark beansprucht werden, Verklemmungen oder Materialverformungen auftreten und dgl. Nachteile mehr.With the invention, it is now possible to transport higher loads over such an inclined elevator with less construction effort, without the individual shots being overstrained in their overlaps, jamming or material deformations occurring and the like. Disadvantages more.
Die Zeichnung zeigt mit
- Figur 1 eine Seitenansicht eines erfingungsgemäßen Teleskopauslegers in ausgefahrener und endseitig abgestützter Position
Figur 2 einen Querschnitt durch den Teleskopausleger nach Fig. 1 in vergrößerter DarstellungFigur 3 den Teleskopausleger als einseitig eingespannten Träger
- Figure 1 is a side view of a telescopic boom according to the invention in the extended and end-supported position
- Figure 2 shows a cross section through the telescopic boom of FIG. 1 in an enlarged view
- Figure 3 shows the telescopic boom as a cantilever beam
Ein Teleskopausleger 1 eines Schrägaufzuges bildet Führungsschienen 2 für die Verfahrbarkeit eines Lastkübels 3. Die Teleskopschüsse 4 sind durch Riegelelemente 5 in ihrer gewählten Ausfahrposition festgelegt. Zwei Seile 6 sind über Abstandshalter 7 geführt und bilden einen Untergurt 17. Die Abstandshalter 7 sind jeweils an den Enden 9 der Teleskopschüsse 4 angebracht und bilden im eingefahrenen Zustand ein dicht aneinander liegendes Paket. Die Seile 6 sind am äußeren Ende des vorletzten Teleskopschusses an Anschlägen 10 festgelegt. Sie laufen über entsprechende Führungen der Abstandshalter 7 über eine Seilhaltevorrichtung 14 und Führungen 13 zur vorgespannten Wickelrolle 11, die einen Seilspeicher 12 bildet. Die Vorspannung kann auf beliebigem Wege hydraulisch, pneumatisch, elektrisch oder durch Federwerk in Aufwickelrichtung erzeugt sein, um eine stetige Seilspannung sicher zu stellen. Beim Ausfahren der Teleskopschüsse entfernen sich die Abstandshalter 7 zunehmend voneinander und gleiten - über das Seil, das sich stetig durch Abwickeln von der Wickelrolle 11 verlängert. Ist die erforderliche Ausfahrposition erreicht, wird eine Seilhaltevorrichtung 14 eingeschaltet, die als Rücklaufbremse, als Klampe oder dgl. in bekannter Weise ausgebildet sein kann. Die Seile 6 laufen nunmehr vom Anschlag 10 unterhalb des Teleskopauslegers 1 bis zur Seilhaltevorrichtung 14 am ersten Teleskopschuß 16, so daß dieser mit allen Teleskopschüssen bis zum vorletzten Teleskopschuß einen durch den Untergurt 17 versteiften Träger 18 bildet. Da der Träger einseitig eingespannt ist, biegt er sich wie eine freigehaltene Rute, je nach der Schräglage, so daß die Seile 6 eine Sehne bilden. Wird nun die Seilhaltevorrichtung 14 eingeschaltet, so kann sich diese gebogene Stellung nicht mehr wesentlich verändern. Legt sich das äußere Ende des Teleskopauslegers mit seinen oberen Stützteilen 8 am vorletzten Teleskopschuß 15 auf einem oberen Festpunkt 19 und mit seinem unteren Ende des ersten Teleskopschusses 16 an einem unteren Festpunkt 20 auf, so bildet sich ein beidseitig aufgelegter Träger, der sich nunmehr nach unten durchbiegen will. Dies will er insbesondere dann, wenn ein schwerer Lastkübel 3 auf ihm transportiert wird. Diese Durchbiegekräfte spannen nun die Seile 6, ohne daß gesonderte Spannvorrichtungen erforderlich sind.
Claims (1)
- Telescopic arm, comprising at least two telescopic lengths between which there is provided a locking arrangement preventing relative movement in the retracting sense, one or more ropes being guided over spacer elements at the underside of the telescopic arm and bridging a plurality of telescopic lengths, and the rope or ropes being connected to a tensioning and rope-holding device which is arranged on the first telescopic length, characterised in that the telescopic arm (1) is constructed as an inclined hoist and comprises guide rails (2) for a load vehicle (load bucket (3)) movable on the upper side of the said hoist, that the tensioning device comprises a winding drum (11) which forms a rope-storing means (12) and which is provided with a tension drive preloaded in the retracting direction, and that the winding drum is preceded by a rope-holding device (14) which is operatable from the control position by means of an operating element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82108666T ATE19618T1 (en) | 1981-09-23 | 1982-09-20 | STIFFENING TELESCOPIC BOOM. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3137846A DE3137846C2 (en) | 1981-09-23 | 1981-09-23 | Telescopic boom with at least two telescopic sections |
| DE3137846 | 1981-09-23 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0076420A2 EP0076420A2 (en) | 1983-04-13 |
| EP0076420A3 EP0076420A3 (en) | 1984-05-16 |
| EP0076420B1 true EP0076420B1 (en) | 1986-05-07 |
Family
ID=6142413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82108666A Expired EP0076420B1 (en) | 1981-09-23 | 1982-09-20 | Strengthened telescopic jib |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4498263A (en) |
| EP (1) | EP0076420B1 (en) |
| AT (1) | ATE19618T1 (en) |
| DE (2) | DE3137846C2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3500876C1 (en) * | 1985-01-12 | 1986-06-19 | Albert Böcker GmbH & Co KG, 4712 Werne | Goods elevator, in particular inclined elevator with a rail composed of several telescopic sections |
| DE9318594U1 (en) * | 1993-12-04 | 1994-02-10 | Teupen Maschinenbaugesellschaft mbH, 48599 Gronau | Device for setting the pretension on the cable girder of a jib hoist |
| US6565565B1 (en) | 1998-06-17 | 2003-05-20 | Howmedica Osteonics Corp. | Device for securing spinal rods |
| SG135923A1 (en) | 1998-07-13 | 2007-10-29 | Inventio Ag | Rope traction elevator |
| DE20219126U1 (en) * | 2002-12-10 | 2004-04-15 | Liebherr-Werk Ehingen Gmbh | telescopic boom |
| US9539948B1 (en) | 2016-03-22 | 2017-01-10 | Jac Products, Inc. | Telescoping step assist system and method |
| US10723272B2 (en) | 2017-12-04 | 2020-07-28 | Jac Products, Inc. | Step rail system for vehicle |
| GB2572785A (en) * | 2018-04-10 | 2019-10-16 | Bright Structures Ltd | A frame |
| US20210180403A1 (en) * | 2019-12-11 | 2021-06-17 | Leverage Design Holding, LLC | Ladder Stiffener |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7147827U (en) * | 1972-05-31 | Hasenbach L | Extendable ladder |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7616C (en) * | C. D. MAGIRUS, Fabrikant, in Ulm | Fire ladder | ||
| US2795303A (en) * | 1952-12-26 | 1957-06-11 | Benjamin H Muehlhause | Masts or towers |
| BE532306A (en) * | 1953-10-05 | |||
| CH396765A (en) * | 1963-10-29 | 1965-07-31 | Bruehwiler Alfons | Transport device for roof tiles |
| US3534867A (en) * | 1968-07-25 | 1970-10-20 | Harnischfeger Corp | Compensating boom hoist cable system for a telescopic boom for cranes or the like |
| US3514918A (en) * | 1969-09-23 | 1970-06-02 | Bill Archer | Method of pre-stressing a column |
| US3674157A (en) * | 1970-03-25 | 1972-07-04 | Tyee Construction Co | Crane with telescopic boom |
| US3831771A (en) * | 1973-02-16 | 1974-08-27 | Harnischfeger Corp | Mobile crane with telescopic boom and jib and method for connecting the latter |
| US3977139A (en) * | 1975-05-23 | 1976-08-31 | Bryant Raymond S | Tower having raising and lowering means |
| FI53155C (en) * | 1975-06-24 | 1979-09-17 | Vierumaeen Teollisuus Oy | FOERSPAENT BYGGNADSELEMENT MED EN TRAEKONSTRUKTION |
| US4183440A (en) * | 1977-03-31 | 1980-01-15 | Auto Crane Company | Extensible boom |
| DE3001410C2 (en) * | 1980-01-16 | 1984-11-15 | Albert Böcker GmbH & Co KG, 4712 Werne | Freight elevator with telescopic rail |
-
1981
- 1981-09-23 DE DE3137846A patent/DE3137846C2/en not_active Expired
-
1982
- 1982-09-20 AT AT82108666T patent/ATE19618T1/en not_active IP Right Cessation
- 1982-09-20 EP EP82108666A patent/EP0076420B1/en not_active Expired
- 1982-09-20 US US06/420,408 patent/US4498263A/en not_active Expired - Fee Related
- 1982-09-20 DE DE8282108666T patent/DE3271020D1/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7147827U (en) * | 1972-05-31 | Hasenbach L | Extendable ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3271020D1 (en) | 1986-06-12 |
| EP0076420A2 (en) | 1983-04-13 |
| EP0076420A3 (en) | 1984-05-16 |
| DE3137846A1 (en) | 1983-04-28 |
| DE3137846C2 (en) | 1985-01-03 |
| ATE19618T1 (en) | 1986-05-15 |
| US4498263A (en) | 1985-02-12 |
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