EP0669279B1 - Telescopic rod - Google Patents

Telescopic rod Download PDF

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Publication number
EP0669279B1
EP0669279B1 EP95101719A EP95101719A EP0669279B1 EP 0669279 B1 EP0669279 B1 EP 0669279B1 EP 95101719 A EP95101719 A EP 95101719A EP 95101719 A EP95101719 A EP 95101719A EP 0669279 B1 EP0669279 B1 EP 0669279B1
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EP
European Patent Office
Prior art keywords
piston
telescopic bar
cylinder unit
sections
accordance
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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 - Lifetime
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EP95101719A
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German (de)
French (fr)
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EP0669279A1 (en
Inventor
Horst Dipl.-Ing. Zimmermann
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs

Definitions

  • the invention relates to a telescopic rod with the features of The preamble of claim 1.
  • Such telescopic rods are z. B. as a telescopic boom in a vehicle or Rail crane used as a cantilever arm of a truck loading crane or as a telescopic arm at a working platform.
  • the telescopic rod consists of several tube-like shots which are slidably mounted one inside the other.
  • the cross section of this tubular shots can be round, oval or polygonal. In the latter case acts it is box-like profile cross-sections.
  • the to extend the telescopic rod serving multi-stage piston-cylinder unit is arranged within the rod and the number of steps can be the number of shots of the telescopic rod correspond. However, this does not necessarily have to be the case.
  • a return device of its own which can consist of a rope or a chain that is inside the telescopic rod lies on the one hand with the last extendable shot and on the other hand is connected to a winding device.
  • the extendable part of the piston rod is a large one Length, one usually sees a piston rod with a large diameter that has the required kink resistance. However, if you Increased diameter of the piston rod, you have to use a cylinder accordingly provide larger dimensions so that there is a greater weight and thereby increase the manufacturing costs.
  • the invention is therefore based on the object of structurally simple measures to propose the kink resistance of the multi-stage piston-cylinder unit to improve or increase what according to the invention by those measures manages the content and subject of the characterizing part of the claim 1 are. Thanks to the proposal according to the invention, the high Kink stiffening of the piston-cylinder unit achieved in that part of the collar Abutment provided in the base or foot area of the individual shots are, in part by abutments that the different diameters of the individual stages of the piston-cylinder unit adapt themselves without separate and complex drive means must be provided for this.
  • the telescopic rod which is shown moved together in FIG. 1, has five one inside the other Slidable shots (1, 2, 3, 4, 5) on a circumferentially closed Cross section.
  • This cross section can be round, oval, but also polygonal.
  • the first shot 1 is at one end in a not shown here Shape stored, which essentially depends on the purpose of the telescopic rod judges. If it is a jib for a mobile crane, it is the telescopic rod by one perpendicular to the drawing plane and one in the axis lying in the drawing plane can be pivoted.
  • the individual shots 1 to 5 are guided in a suitable manner.
  • a multi-stage, single-acting piston-cylinder unit 13 arranged here only with the first shot 1 on the Position 6 and with the last shot in the row 5 at point 10 is connected.
  • the number of stages of the piston-cylinder unit 13 can be different from the number of shots 1 to 5 of the telescopic rod.
  • the last in line Shot 5 carries at its free end a head flange 16, also other construction elements can be specified here, depending on the application the telescopic rod is provided.
  • This abutment 7 here consists of a ring 20, which is the piston-cylinder unit 13 encloses with some play.
  • This ring 20 is spoke-like Bracing with the inside of the base area of the second Shot 2 connected.
  • individual ones can also be used radially extending webs may be provided.
  • a collar 15 is fixed, in which several, parallel to the axis of the Telescopic rod extending guide rails 14 are slidably mounted. At their outer end, these guide rails 14 are with a within the last shot 5 slidably arranged, preferably on the Inner wall of this shot 5 connected hub 22 connected. This hub is 22 in the middle with little play from the last stage 23 of the piston-cylinder unit 13 enforced.
  • An abutment 8 comparable to the fixed abutment 7 is also in the base area the last shot 5 arranged.
  • abutments 18 and 19 are here by means of pawls 24 pivotably mounted along the inner circumference and 25, expediently along this circumference at least three such abutments in the same arc spacing are arranged.
  • the individual pawls 24 and 25 are by springs 26 and 27 charged.
  • the pivot axes of these pawls 24 and 25 lie in the cross-sectional planes the shots and their swiveling planes in the longitudinal central axis in one the Longitudinal central axis of the telescopic rod containing longitudinal plane.
  • the torque exerted by the springs 26, 27 is against the direction of extension the piston-cylinder unit 13 directed.
  • These jacks 24 and 25 can be designed so that they either in their pivoted position abut directly at the respective stage of the piston-cylinder unit 13 or but that their support surfaces are at least immediately adjacent to these steps.
  • These pawls 24 and 25 are suitably mounted so that they are in their pivoted position take a locked dead center position so that one on the support surfaces in the radial direction - based on the cross-sectional planes of the telescopic rod - acting force the pawls do not swing out of their Can move position or position. This is done by the detailed representation according to FIG. 4 clear.
  • the swivel angle, the position of the stop and the position of the support surface of the pawl with respect to the pivot axis are so aligned with each other that one in the radial direction - based on the cross-sectional planes of the telescopic rod - acting on the support surface of the pawl Force, this cannot pivot, so that if high or eccentric Load on the telescopic rod and the associated low lateral Evasion of the piston-cylinder unit 13 these pawls their support function exercise.
  • a separate device is provided for retracting the telescopic rod, which here consists of a steel cable 12 and a winding device 11.
  • This steel cable 12 which runs within the wefts, is at the end with the last shot 5 connected.
  • the above-mentioned support function is carried out in the base area of shots 2 and 5 fixed abutments 7 and 8, as described above, exercised.
  • a stop 17 is provided which is fixed to the inner wall of the shot 5.
  • the measure according to the invention it is possible with a multi-part or multi-stage piston-cylinder unit 13 whose outer dimensions as possible to keep small, but at the same time to be able to transmit very high forces, since the kink resistance compared to previously known measures is considerable could be improved.
  • the means for lateral support are dimensioned relatively small, but they are sufficient, the kink resistance of the extended and loaded telescopic rod very significantly, as experience has shown low lateral forces are only necessary to achieve this Avoid buckling of a rod-like component.

Abstract

The telescopic rod comprises several telescopic tubular sections (1-5) and a multi-stage piston cylinder unit (13) which at one end is connected to the outermost rod section (1) and at the other end is connected to the last inner section (5). On the inner base areas of at least some rod sections (3,4) are radially adjustable abutments (18,19) which are directed towards the outer sleeve face of the extended stages of the piston/cylinder unit (13). The first and last extensible rod sections (2,5) have fixed abutments (7,15) mounted adjoining the outer sleeve faces of the steps associated with same when the piston cylinder unit is extended. Swivel mounted pawls (24,25) are mounted as abutments along the inner circumference in the base area of the sections (3,4).

Description

Die Erfindung bezieht sich auf einen Teleskopierstab mit den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a telescopic rod with the features of The preamble of claim 1.

Solche Teleskopierstäbe werden z. B. als Teleskopausleger bei einem Fahrzeug-oder Schienenkran verwendet, als Kragarm eines LKW-Ladekranes oder als Teleskoparm bei einer Arbeitsbühne. Der Teleskopierstab besteht dabei aus mehreren ineinander verschiebbar gelagerten, rohrartigen Schüssen. Der Querschnitt dieser rohrartigen Schüsse kann rund sein, oval oder mehreckig. Im letzteren Fall handelt es sich um kastenartige Profilquerschnitte. Die zum Ausfahren des Teleskopierstabes dienende mehrstufige Kolben-Zylindereinheit ist innerhalb des Stabes angeordnet und die Anzahl der Stufen kann der Anzahl der Schüsse des Teleskopierstabes entsprechen. Dies muß jedoch nicht unbedingt der Fall sein. Um den Teleskopierstab einzufahren, ist in der Regel eine eigene Rückholeinrichtung vorhanden, die aus einem Seil oder einer Kette bestehen kann, die innerhalb des Teleskopierstabes liegt und die einerseits mit dem letzten ausfahrbaren Schuß und andererseits mit einer Aufwickeleinrichtung verbunden ist.Such telescopic rods are z. B. as a telescopic boom in a vehicle or Rail crane used as a cantilever arm of a truck loading crane or as a telescopic arm at a working platform. The telescopic rod consists of several tube-like shots which are slidably mounted one inside the other. The cross section of this tubular shots can be round, oval or polygonal. In the latter case acts it is box-like profile cross-sections. The to extend the telescopic rod serving multi-stage piston-cylinder unit is arranged within the rod and the number of steps can be the number of shots of the telescopic rod correspond. However, this does not necessarily have to be the case. Around the telescopic rod to retract, there is usually a return device of its own, which can consist of a rope or a chain that is inside the telescopic rod lies on the one hand with the last extendable shot and on the other hand is connected to a winding device.

Wenn der Teleskopierstab bzw. die Kolben-Zylindereinheit ausgefahren wird, verringert sich die Widerstandsfähigkeit desselben gegen die auf die ausgefahrene Kolbenstange aufgebrachte Knickbeanspruchung entsprechend dem Ausmaß, in dem der Teleskopierstab ausgefahren wird, d. h. in Abhängigkeit von der Länge des ausgefahrenen Teiles der Kolbenstange bzw. der wirksamen Länge jedes Auslegerteiles. Je größer die Länge des Teleskopierstabes im ausgefahrenen Zustand ist, desto größer muß daher die Widerstandsfähigkeit gegen Knickbeanspruchungen sein. Da man in der Praxis Krane mit großer Hubhöhe benötigt, muß jedes Auslegerteil eines ausfahrbaren Teleskopierstabes eine sehr große Länge erhalten, und infolgedessen benötigt man eine Kolben-Zylindereinheit mit einer entsprechend langen Kolbenstange, damit eines der langen Auslegerteile gegenüber einem anderen Auslegerteil über die erforderliche Strecke ausgefahren und eingezogen werden kann. Wenn der ausfahrbare Teil der Kolbenstange eine große Länge hat, sieht man gewohnlich eine Kolbenstange mit einem großen Durchmesser vor, die die erforderliche Knickfestigkeit besitzt. Wenn man jedoch den Durchmesser der Kolbenstange vergrößert, muß man einen Zylinder mit entsprechend größeren Abmessungen vorsehen, so daß sich ein größeres Gewicht ergibt und sich dadurch die Herstellungskosten erhöhen. When the telescopic rod or piston-cylinder unit is extended, the resistance of the same to the extended one decreases Piston rod applied buckling stress according to the extent, in the telescopic rod is extended, d. H. depending on the length the extended part of the piston rod or the effective length of each Boom part. The greater the length of the telescopic rod when extended is, the greater the resistance to buckling stresses must be be. Since cranes with a large lifting height are required in practice, each must Cantilever part of an extendable telescopic rod have a very large length, and as a result, a piston-cylinder unit with a corresponding one is required long piston rod, so that one of the long boom parts opposite another boom part extended and drawn in over the required distance can be. If the extendable part of the piston rod is a large one Length, one usually sees a piston rod with a large diameter that has the required kink resistance. However, if you Increased diameter of the piston rod, you have to use a cylinder accordingly provide larger dimensions so that there is a greater weight and thereby increase the manufacturing costs.

Es wurde daher bereits nach Mitteln gesucht, durch welche das Ausknicken einer ausgefahrenen Kolben-Zylindereinheit bei einem Teleskopierstab unterbunden werden kann. Solche Mittel sind in der DE-OS 2018 926 beschrieben und gezeigt. Es ist hier ein auf der Kolbenstange der Kolben-Zylindereinheit verschiebbar gelagerter Schlitten vorgesehen, der radial nach außen gerichtete, starre Arme aufweist, die über Rollen oder Gleitschuhe an der Innenseite des jeweils nachfolgenden Schusses oder Auslegerteiles anliegen, wobei dieser Schlitten mit Antriebsmitteln versehen ist, die über Übersetzungen geführt sind, und zwar in der Weise, daß bei einem vorgegebenen Ausfahrweg zweier Schüsse oder Auslegerteile der auf der Kolbenstange geführte Schlitten nur die halbe Strecke dieses Ausfahrweges zurücklegt. Dies geschieht zum Teil über Seilzüge, zum Teil über Zahnstangen und Ritzel oder gegen Federzüge wirkende Mitnehmer. Alle diese Maßnahmen sind konstruktiv aufwendig und daher nicht zweckmäßig.Therefore, means were already being sought by which the buckling of a extended piston-cylinder unit prevented with a telescopic rod can be. Such means are described and shown in DE-OS 2018 926. Here it is a slidably mounted on the piston rod of the piston-cylinder unit Slide provided, which has radially outwardly directed, rigid arms, the one over rollers or sliding shoes on the inside of the following one Weft or cantilever part rest, this carriage with drive means is provided, which are done through translations, namely in the Way that with a given extension of two shots or boom parts the slide guided on the piston rod is only half the distance of this extension travels. This is done partly via cables, partly via Racks and pinions or drivers acting against spring balancers. All these Measures are structurally complex and therefore not practical.

Der Erfindung liegt daher die Aufgabe zugrunde, konstruktiv einfache Maßnahmen vorzuschlagen, um die Knicksicherheit der mehrstufigen Kolben-Zylindereinheit zu verbessern bzw. zu erhöhen, was gemäß der Erfindung durch jene Maßnahmen gelingt, die Inhalt und Gegenstand des kennzeichnenden Teiles des Patentanspruches 1 sind. Dank des erfindungsgemäßen Vorschlages wird die hohe Knickaussteifung der Kolben-Zylindereinheit dadurch erreicht, daß zum Teil kragenartige Widerlager im Basis- oder Fußbereich der einzelnen Schüsse vorgesehen sind, zum Teil durch Widerlager, die den unterschiedlichen Durchmessern der einzelnen Stufen der Kolben-Zylindereinheit sich selbsttätig anpassen, ohne daß dafür eigene und aufwendige Antriebsmittel vorgesehen werden müssen.The invention is therefore based on the object of structurally simple measures to propose the kink resistance of the multi-stage piston-cylinder unit to improve or increase what according to the invention by those measures manages the content and subject of the characterizing part of the claim 1 are. Thanks to the proposal according to the invention, the high Kink stiffening of the piston-cylinder unit achieved in that part of the collar Abutment provided in the base or foot area of the individual shots are, in part by abutments that the different diameters of the individual stages of the piston-cylinder unit adapt themselves without separate and complex drive means must be provided for this.

Ohne die Erfindung einzuschränken, wird ein Ausführungsbeispiel anhand der Zeichnung näher erörtert. Es zeigen:

  • Fig. 1 schematisch einen Längsschnitt durch einen zusammengefahrenen Teleskopierstab; Fig. 2 einen schematischen Längsschnitt durch den selben Teleskopierstab wie in Fig. 1, jedoch zur Gänze ausgefahren; Fig. 3 schematisch die in der Reihe letzten Stufen der ausgefahrenen Kolben-Zylindereinheit und die Fig. 4 und 5 Details betreffend die verschwenkbaren Widerlager, und zwar in zwei unterschiedlichen Betriebsstellungen; die Darstellungen weisen unterschiedliche Maßstäbe auf.
    • Without restricting the invention, an embodiment is discussed in more detail with reference to the drawing. Show it:
  • Figure 1 shows schematically a longitudinal section through a telescopic rod moved together. Figure 2 is a schematic longitudinal section through the same telescopic rod as in Figure 1, but fully extended. 3 shows schematically the last stages in the row of the extended piston-cylinder unit and FIGS. 4 and 5 details relating to the pivotable abutment, in two different operating positions; the representations have different scales.

    • Der Teleskopierstab, der in Fig. 1 zusammengefahren gezeigt ist, weist fünf ineinander verschiebbare Schüsse (1, 2, 3, 4, 5) auf, die einen umfangsgeschlossenen Querschnitt haben. Dieser Querschnitt kann rund sein, oval, aber auch mehreckig. The telescopic rod, which is shown moved together in FIG. 1, has five one inside the other Slidable shots (1, 2, 3, 4, 5) on a circumferentially closed Cross section. This cross section can be round, oval, but also polygonal.

    Der erste Schuß 1 ist an seinem einen Ende in einer hier nicht näher dargestellten Form gelagert, die sich im wesentlichen nach dem Einsatzzweck des Teleskopierstabes richtet. Handelt es sich um einen Ausleger für einen Fahrzeugkran, so ist der Teleskopierstab um eine rechtwinkelig zur Zeichenebene stehende und eine in der Zeichenebene liegende Achse schwenkbar.The first shot 1 is at one end in a not shown here Shape stored, which essentially depends on the purpose of the telescopic rod judges. If it is a jib for a mobile crane, it is the telescopic rod by one perpendicular to the drawing plane and one in the axis lying in the drawing plane can be pivoted.

    Die einzelnen Schüsse 1 bis 5 sind in geeigneter Weise aneinandergleitend geführt. Innerhalb dieser Schüsse 1 bis 5 ist eine mehrstufige, einfach wirkende Kolben-Zylindereinheit 13 angeordnet, die hier nur mit dem ersten Schuß 1 an der Stelle 6 und mit dem in der Reihe letzten Schuß 5 an der Stelle 10 verbunden ist. Die Anzahl der Stufen der Kolben-Zylindereinheit 13 kann verschieden sein von der Anzahl der Schüsse 1 bis 5 des Teleskopierstabes. Der in der Reihe letzte Schuß 5 trägt an seinem freien Ende einen Kopfflansch 16, auch andere Konstruktionselemente können hier festgelegt sein, je nachdem, für welchen Einsatzzweck der Teleskopierstab vorgesehen ist.The individual shots 1 to 5 are guided in a suitable manner. Within these shots 1 to 5 is a multi-stage, single-acting piston-cylinder unit 13 arranged here only with the first shot 1 on the Position 6 and with the last shot in the row 5 at point 10 is connected. The number of stages of the piston-cylinder unit 13 can be different from the number of shots 1 to 5 of the telescopic rod. The last in line Shot 5 carries at its free end a head flange 16, also other construction elements can be specified here, depending on the application the telescopic rod is provided.

    Im Basisbereich des in der Reihe zweiten Schusses 2 ist nun ein festes Widerlager 7 vorgesehen. Dieses Widerlager 7 besteht hier aus einem Ring 20, der die Kolben-Zylindereinheit 13 mit etwas Spiel umschließt. Dieser Ring 20 ist über speichenartige Verstrebungen mit der Innenseite des Basisbereiches des zweiten Schusses 2 verbunden. Anstelle eines solchen Ringes 20 können auch einzelne radial verlaufende Stege vorgesehen sein.In the base area of the second shot 2 in the row there is now a fixed abutment 7 provided. This abutment 7 here consists of a ring 20, which is the piston-cylinder unit 13 encloses with some play. This ring 20 is spoke-like Bracing with the inside of the base area of the second Shot 2 connected. Instead of such a ring 20, individual ones can also be used radially extending webs may be provided.

    Am freien Ende der in der Reihe vorletzten Stufe 21 der Kolben-Zylindereinheit 13 ist ein Kragen 15 festgelegt, in welchem mehrere, sich parallel zur Achse des Teleskopierstabes erstreckende Führungsschienen 14 verschiebbar gelagert sind. An ihrem außenseitig liegenden Ende sind diese Führungsschienen 14 mit einer innerhalb des letzten Schusses 5 verschiebbar angeordneten, vorzugsweise an der Innenwand dieses Schusses 5 anliegenden Nabe 22 verbunden. Diese Nabe 22 ist mittig mit geringem Spiel von der letzten Stufe 23 der Kolben-Zylindereinheit 13 durchsetzt.At the free end of the penultimate stage 21 of the piston-cylinder unit 13 a collar 15 is fixed, in which several, parallel to the axis of the Telescopic rod extending guide rails 14 are slidably mounted. At their outer end, these guide rails 14 are with a within the last shot 5 slidably arranged, preferably on the Inner wall of this shot 5 connected hub 22 connected. This hub is 22 in the middle with little play from the last stage 23 of the piston-cylinder unit 13 enforced.

    Ein mit dem festen Widerlager 7 vergleichbares Widerlager 8 ist ferner im Basisbereich des letzten Schusses 5 angeordnet.An abutment 8 comparable to the fixed abutment 7 is also in the base area the last shot 5 arranged.

    In den Basisbereichen der zwischen den besprochenen Schüssen 1, 2 und 5 liegenden Schüsse 3 und 4 sind nun radial verstellbare, gegen die äußere Mantelfläche der ausfahrbaren Stufen der Kolben-Zylindereinheit 13 gerichtete, evtl. an diese anlegbare Widerlager 18 und 19 vorgesehen. Diese Widerlager 18 und 19 sind hier durch entlang des inneren Umfanges als schwenkbar gelagerte Klinken 24 und 25 ausgebildet, wobei zweckmäßigerweise entlang dieses erwähnten Umfanges mindestens drei solcher Widerlager in voneinander gleichen Bogenabständen angeordnet sind. Die einzelnen Klinken 24 und 25 sind durch Federn 26 und 27 belastet. Die Schwenkachsen dieser Klinken 24 und 25 liegen in den Querschnittsebenen der Schüsse und ihre Schwenkebenen in der Längsmittelachse in einer die Längsmittelachse des Teleskopierstabes beinhaltenden Längsebene.In the basic areas of the shots between 1, 2 and 5 Shots 3 and 4 are now radially adjustable, against the outer surface the extendable stages of the piston-cylinder unit 13, possibly to this abutments 18 and 19 can be provided. These abutments 18 and 19 are here by means of pawls 24 pivotably mounted along the inner circumference and 25, expediently along this circumference at least three such abutments in the same arc spacing are arranged. The individual pawls 24 and 25 are by springs 26 and 27 charged. The pivot axes of these pawls 24 and 25 lie in the cross-sectional planes the shots and their swiveling planes in the longitudinal central axis in one the Longitudinal central axis of the telescopic rod containing longitudinal plane.

    Das von den Federn 26, 27 ausgeübte Drehmoment ist dabei gegen die Ausschieberichtung der Kolben-Zylindereinheit 13 gerichtet. Diese Klinken 24 und 25 können dabei so ausgebildet sein, daß sie in ihrer eingeschwenkten Stellung entweder direkt an der jeweiligen Stufe der Kolben-Zylindereinheit 13 anliegen oder aber, daß ihre Stützflächen diesen Stufen zumindest unmittelbar benachbart sind. Diese Klinken 24 und 25 sind zweckmäßigerweise so gelagert, daß sie in ihrer eingeschwenkten Stellung eine arretierte Totpunktlage einnehmen, so daß eine auf die Stützflächen in radialer Richtung - bezogen auf Querschnittsebenen des Teleskopierstabes - einwirkende Kraft die Klinken nicht aus ihrer eingschwenkten Stellung oder Lage bewegen können. Das macht die Detaildarstellung nach Fig. 4 deutlich.The torque exerted by the springs 26, 27 is against the direction of extension the piston-cylinder unit 13 directed. These jacks 24 and 25 can be designed so that they either in their pivoted position abut directly at the respective stage of the piston-cylinder unit 13 or but that their support surfaces are at least immediately adjacent to these steps. These pawls 24 and 25 are suitably mounted so that they are in their pivoted position take a locked dead center position so that one on the support surfaces in the radial direction - based on the cross-sectional planes of the telescopic rod - acting force the pawls do not swing out of their Can move position or position. This is done by the detailed representation according to FIG. 4 clear.

    Wird ausgehend von der in Fig. 1 gezeigten Lage der Schüsse 1 bis 5 zueinander die Kolben-Zylindereinheit 13 beaufschlagt, so fahren deren einzelne Stufen aus, bis schlußendlich die aus Fig. 2 ersichtliche Lage der einzelnen Baukomponenten zueinander erreicht wird. Es ist dabei für die Wirkung der erfindungsgemäßen Einrichtung nicht von Bedeutung, in welcher Reihenfolge die einzelnen Stufen der einfach beaufschlagbaren Kolben-Zylindereinheit 13 ausfahren. Es sind hier ja mehrere Möglichkeiten denkbar: Die einzelnen Stufen fahren ihren Durchmessern entsprechend nacheinander aus, wobei entweder die Stufe mit dem größten Durchmesser beginnt oder jene mit dem kleinsten; als weitere Möglichkeit ist denkbar, daß die einzelnen Stufen in beliebiger Reihenfolge auseinanderfahren.Starting from the position of the shots 1 to 5 relative to one another shown in FIG. 1 acted upon the piston-cylinder unit 13, their individual stages extend, until finally the position of the individual structural components shown in FIG. 2 to each other is achieved. It is for the effect of the invention Setup does not matter in what order the individual stages of the Simply extend the piston-cylinder unit 13 which can be acted upon. It is here several possibilities are conceivable: the individual steps move according to their diameters accordingly one after the other, either the level with the largest Diameter begins or the one with the smallest; as another option conceivable that the individual stages move apart in any order.

    Aus den Figuren ist nun erkennbar, daß die Klinken 24 im Basisbereich des Schusses 3, die vorerst am Mantel der ersten Stufe der Kolben-Zylindereinheit 13 unter der Wirkung der Feder 26 anliegen, durch die von dieser Feder ausgeübte Kraft verschwenkt werden, sobald der Basisbereich dieses Schusses 3 die erste Stufe der Kolben-Zylindereinheit 13 überfahren hat. Die Feder 26 verschwenkt die Klinke 24 gegen einen Anschlag, so daß die Stützfläche der Klinke am Mantel der entsprechenden Stufe der Kolben-Zylindereinheit 13 mit geringem Spiel gegenüberliegt bzw. an diesem anliegt. Der Schwenkwinkel, die Lage des Anschlages und die Lage der Stützfläche der Klinke gegenüber der Schwenkachse sind so aufeinander abgestellt, daß eine in radialer Richtung - bezogen auf die Querschnittsebenen des Teleskopierstabes - auf die Stützfläche der Klinke einwirkende Kraft, diese nicht verschwenken kann, so daß, falls bei hoher oder exzentrischer Belastung des Teleskopierstabes und einer damit verbundenen geringen seitlichen Ausweichung der Kolben-Zylindereinheit 13 diese Klinken ihre Stützfunktion ausüben.From the figures it can now be seen that the pawls 24 in the base region of the Shot 3, which is initially on the jacket of the first stage of the piston-cylinder unit 13 rest under the action of the spring 26 by the exerted by this spring Force be pivoted as soon as the base area of this shot 3 is the first Has passed over the piston-cylinder unit 13. The spring 26 pivots the Pawl 24 against a stop, so that the support surface of the pawl on the jacket of the corresponding stage of the piston-cylinder unit 13 opposite with little play or is attached to it. The swivel angle, the position of the stop and the position of the support surface of the pawl with respect to the pivot axis are so aligned with each other that one in the radial direction - based on the cross-sectional planes of the telescopic rod - acting on the support surface of the pawl Force, this cannot pivot, so that if high or eccentric Load on the telescopic rod and the associated low lateral Evasion of the piston-cylinder unit 13 these pawls their support function exercise.

    Da der Teleskopierstab mit einer einfach wirkenden Kolben-Zylindereinheit ausgestattet ist, ist zum Einfahren des Teleskopierstabes eine eigene Einrichtung vorgesehen, die hier aus einem Stahlseil 12 und einer Aufwickeleinrichtung 11 besteht. Dieses Stahlseil 12, das innerhalb der Schüsse verläuft, ist endseitig mit dem letzten Schuß 5 verbunden.Because the telescopic rod with a single-acting piston-cylinder unit fitted a separate device is provided for retracting the telescopic rod, which here consists of a steel cable 12 and a winding device 11. This steel cable 12, which runs within the wefts, is at the end with the last shot 5 connected.

    Die vorerwähnte Stützfunktion wird im Basisbereich der Schüsse 2 und 5 durch feste Widerlager 7 und 8, wie vorstehend beschrieben, ausgeübt.The above-mentioned support function is carried out in the base area of shots 2 and 5 fixed abutments 7 and 8, as described above, exercised.

    Zur seitlichen Stützung der letzten und kleinsten Stufe der Kolben-Zylindereinheit 13 dient die Nabe 22 in Verbindung mit dem Kragen 15 und den Führungsschienen 14, deren Funktion sich aus dem vorstehend Gesagten und der entsprechenden Figur unmittelbar ergibt. Um eine definierte Stellung der Nabe 22 zu erreichen, ist ein Anschlag 17 vorgesehen, der an der Innenwand des Schusses 5 festgelegt ist.For lateral support of the last and smallest step of the piston-cylinder unit 13 serves the hub 22 in connection with the collar 15 and the guide rails 14, whose function is derived from the above and the corresponding Figure immediately results. In order to achieve a defined position of the hub 22, a stop 17 is provided which is fixed to the inner wall of the shot 5.

    Wird der Teleskopierstab eingefahren, und zwar mit Hilfe des Stahlseiles 12 und der Aufwickeleinrichtung 11, so werden die ausgeschwenkten federbelasteten, als Widerlager dienenden Klinken 24 und 25 durch die durch die unterschiedlichen Durchmesser der einzelnen Stufen der Kolben-Zylindereinheit 13 gebildeten Absätze wieder in ihre Ausgangslage selbsttätig zurückgeschwenkt.If the telescopic rod is retracted, with the help of the steel cable 12 and the winding device 11, the pivoted spring-loaded, as Abutments serving pawls 24 and 25 through the different Diameter of the individual stages of the piston-cylinder unit 13 shoulders automatically pivoted back into its starting position.

    Zur seitlichen Stützung der einzelnen Stufen der ausgefahrenen und belasteten Kolben-Zylindereinheit 13 sind vorstehend einfache mechanische Mittel gezeigt und beschrieben. Es ist denkbar, hier auch aufwendige mechanische, hydraulische oder pneumatisch betätigte Lösungen vorzusehen, die in den einzelnen Querschnittsebenen angeordnet sind und die sich selbsttätig den jeweiligen Durchmessern der Stufen der zu stützenden Kolben-Zylindereinheit 13 anpassen. For lateral support of the individual steps of the extended and loaded Piston-cylinder unit 13 simple mechanical means are shown above and described. It is conceivable here also complex mechanical, hydraulic or to provide pneumatically operated solutions in the individual cross-sectional levels are arranged and which automatically the respective diameters the levels of the piston-cylinder unit 13 to be supported.

    Dank der erfindungsgemäßen Maßnahme ist es möglich, bei einer mehrteiligen bzw. mehrstufigen Kolben-Zylindereinheit 13 deren äußere Abmessungen möglichst klein zu halten, gleichzeitig aber doch sehr hohe Kräfte übertragen zu können, da die Knicksicherheit gegenüber bisher bekannten Maßnahmen erheblich verbessert werden konnte. Die zur seitlichen Abstützung dienenden Mittel sind relativ klein dimensioniert, dennoch reichen sie aus, die Knicksicherheit des ausgefahrenen und belasteten Teleskopierstabes ganz erheblich zu vergrößern, da erfahrungsgemäß geringe seitlich angreifende Kräfte nur notwendig sind, um das Ausknicken eines stabartigen Bauelementes zu vermeiden. Thanks to the measure according to the invention, it is possible with a multi-part or multi-stage piston-cylinder unit 13 whose outer dimensions as possible to keep small, but at the same time to be able to transmit very high forces, since the kink resistance compared to previously known measures is considerable could be improved. The means for lateral support are dimensioned relatively small, but they are sufficient, the kink resistance of the extended and loaded telescopic rod very significantly, as experience has shown low lateral forces are only necessary to achieve this Avoid buckling of a rod-like component.

    Legende zu den Hinweisziffern:Legend to the reference numbers:

    11
    SchußShot
    22nd
    SchußShot
    33rd
    SchußShot
    44th
    SchußShot
    55
    SchußShot
    66
    StelleJob
    77
    WiderlagerAbutment
    88th
    WiderlagerAbutment
    99
    1010th
    StelleJob
    1111
    AufwickeleinrichtungTake-up device
    1212th
    StahlseilSteel cable
    1313
    Kolben-ZylindereinheitPiston-cylinder unit
    1414
    FührungsschieneGuide rail
    1515
    Kragencollar
    1616
    KopfflanschHead flange
    1717th
    Anschlag attack
    1818th
    WiderlagerAbutment
    1919th
    WiderlagerAbutment
    2020th
    Ringring
    2121
    Stufestep
    2222
    Nabehub
    2323
    Stufestep
    2424th
    Klinkepawl
    2525th
    Klinkepawl
    2626
    Federfeather
    2727
    Federfeather
    2828
    SchwenkachseSwivel axis
    2929
    SchwenkachseSwivel axis

    Claims (11)

    1. A telescopic bar comprising a plurality of tubular sections (1, 2, 3, 4, 5) displaceably mounted within one another and a multi-stage piston-cylinder unit (13) which is arranged within the telescopic bar and which is connected at one end to the outermost section (1) of the telescopic bar and at the other end to the last, inner section (5) thereof, characterised in that radially adjustable supports (18, 19) are provided at the inner base regions of at least some sections (3, 4), which supports (18, 19) are directed towards the outer surface of the extended stages of the piston-cylinder unit (13) and can possibly be applied thereagainst, and the second (2) and last extendible sections (5) in the series optionally have stationary supports (7, 15, 22) arranged adjacent to the outer surfaces of the stages associated with the sections (2, 5) when the piston-cylinder unit (13) is extended.
    2. A telescopic bar in accordance with Claim 1, characterised in that pivotably mounted detents (24, 25) are arranged in the base region of the sections (3, 4), along the inner circumference, as supports.
    3. A telescopic bar in accordance with Claim 2, characterised in that at least three pivotably mounted detents (24, 25) are arranged along the inner circumference at equal angular spacings from one another.
    4. A telescopic bar in accordance with Claim 2 or 3, characterised in that the individual detents (24, 25) are loaded by the force of a spring (26, 27).
    5. A telescopic bar in accordance with Claim 2, characterised in that the pivot axes (28, 29) of the detents (24, 25) are located in the cross-sectional planes of the sections (3, 4).
    6. A telescopic bar in accordance with Claim 2, characterised in that the pivot planes of the detents (24, 25) are located in the longitudinal plane containing the longitudinal central axis of the telescopic bar.
    7. A telescopic bar in accordance with any one of Claims 1 to 6, characterised in that the torque exerted upon the detent (24, 25) by the force of the spring (26, 27) is directed against the extension direction of the piston-cylinder unit (13).
    8. A telescopic bar in accordance with Claim 1, characterised in that a collar (15) is arranged at the free end of the penultimate stage in the series of the piston-cylinder unit (13), a plurality of guide rails (14) parallel to the axis of the telescopic bar being displaceably mounted on or in this collar (15), which guide rails (14) are connected at their outer end to a hub (22) which is displaceably mounted within the last section, preferably resting against the inner wall of this section, and which for its part has the last stage (23) of the piston-cylinder unit (13) passing through its centre.
    9. A telescopic bar in accordance with Claim 1, characterised in that a stationary support (7) is provided in the base region of the second section (2) in the series, which support (7) is either in the form of a ring (20) through which the piston-cylinder unit (13) passes with clearance or is composed of individual arms extending to the outer surface of the piston-cylinder unit.
    10. A telescopic bar in accordance with Claim 2, characterised in that the detents (24, 25) make contact in their supporting position with a stop which keeps the detents in a dead-centre position with regard to a force which acts radially - relative to the telescopic bar - thereupon and which is caused by lateral yielding under load of the piston-cylinder unit (13).
    11. A telescopic bar in accordance with any one of Claims 1 to 10, characterised in that the piston-cylinder unit (13) is single acting and a flexible tension member, for example a chain or a steel cable, is provided for the purpose of shortening the extended telescopic bar, which tension member extends along the sections, is connected to the last section in the series and can be wound up at the other end, and the winding equipment is provided exterior to or within the sections.
    EP95101719A 1994-02-25 1995-02-09 Telescopic rod Expired - Lifetime EP0669279B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    AT395/94 1994-02-25
    AT0039594A AT403041B (en) 1994-02-25 1994-02-25 TELESCOPIC STICK

    Publications (2)

    Publication Number Publication Date
    EP0669279A1 EP0669279A1 (en) 1995-08-30
    EP0669279B1 true EP0669279B1 (en) 1999-04-07

    Family

    ID=3489468

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95101719A Expired - Lifetime EP0669279B1 (en) 1994-02-25 1995-02-09 Telescopic rod

    Country Status (5)

    Country Link
    US (1) US5632395A (en)
    EP (1) EP0669279B1 (en)
    JP (1) JPH0834595A (en)
    AT (2) AT403041B (en)
    DE (1) DE59505547D1 (en)

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    CN110054032A (en) * 2019-05-20 2019-07-26 倪军 A kind of novel electric telescopic rod
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    Also Published As

    Publication number Publication date
    DE59505547D1 (en) 1999-05-12
    JPH0834595A (en) 1996-02-06
    ATA39594A (en) 1997-03-15
    US5632395A (en) 1997-05-27
    AT403041B (en) 1997-10-27
    EP0669279A1 (en) 1995-08-30
    ATE178567T1 (en) 1999-04-15

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