EP0666387B1 - Height-extendable trestle - Google Patents

Height-extendable trestle Download PDF

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Publication number
EP0666387B1
EP0666387B1 EP95101316A EP95101316A EP0666387B1 EP 0666387 B1 EP0666387 B1 EP 0666387B1 EP 95101316 A EP95101316 A EP 95101316A EP 95101316 A EP95101316 A EP 95101316A EP 0666387 B1 EP0666387 B1 EP 0666387B1
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EP
European Patent Office
Prior art keywords
trestle
height
sleeve
crank
extendable
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 - Lifetime
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EP95101316A
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German (de)
French (fr)
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EP0666387A1 (en
Inventor
Wilhelm Müller
Siegmar Baum
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Mueller & Baum & Co KG GmbH
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Mueller & Baum & Co KG GmbH
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Publication of EP0666387A1 publication Critical patent/EP0666387A1/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00Scaffolds primarily resting on the ground
    • E04G1/18Scaffolds primarily resting on the ground adjustable in height
    • E04G1/22Scaffolds having a platform on an extensible substructure, e.g. of telescopic type or with lazy-tongs mechanism
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00Scaffolds primarily resting on the ground
    • E04G1/28Scaffolds primarily resting on the ground designed to provide support only at a low height
    • E04G1/32Other free-standing supports, e.g. using trestles

Definitions

  • the present invention relates to a height-adjustable trestle with the features according to the preamble of claim 1.
  • Scaffolding trestles of this type are also known as crank scaffolding trestles and are used for work scaffolding, in particular in the construction sector, with a plurality of crank scaffolding trestles of this type arranged in parallel one behind the other receiving scaffolding planks for a working platform. The height of the work platform can then be changed by adjusting the height of the crank frame.
  • these crank stands have to withstand comparatively high loads of up to around 1500 kg.
  • a horizontal shaft is rotated for the height adjustment, on which a star wheel is seated, the teeth of which engage in a row of holes in each of a perforated square tube of the upper part of the scaffolding trestle.
  • a locking device in the form of a bolt or the like must first be released, the bolt being inserted through a row of holes.
  • a tiltable kickback protection is provided which engages in the star wheel and thus blocks it. The upper part of the crank bracket can only be lowered after this anti-kickback device has been released.
  • a height-adjustable trestle is known (US-A-1 647 432) in which the height-adjustable beam is divided into two vertical spindles is supported, the thread of which is received by an internal thread of a worm wheel.
  • the self-locking and synchronous drive takes place via a horizontal shaft with worms engaging in the worm gears. Since this type of gear connection is associated with a high reduction, the height adjustment of the trestle requires a relatively large amount of time.
  • the object of the invention is to be seen in designing a height-adjustable trestle of this type in such a way that it can be adjusted in less time than in the aforementioned prior art, while maintaining the required security by self-locking.
  • the spindle drive for the height adjustment of the upper part has a self-locking thread, so that the loaded upper part cannot move down by itself and lowering the loaded scaffolding trestle is only possible when the crank is actuated.
  • the gear means are chosen so that due to a favorable transmission ratio, even with the top part of the scaffold frame loaded to a maximum, a relatively rapid start-up or shutdown by hand is possible by means of the crank. If necessary, the hand crank drive can also be replaced by an electric motor drive.
  • both Spindle are coupled in terms of movement via an endless chain or the like, which runs over two sprockets each associated with a spindle, one of these sprockets by rotating the with the Crank connected drive wheel is also driven.
  • the crank can only be attached on one side.
  • the crank is preferably removable and comprises a sleeve to which the drive wheel is connected at the end and which can be plugged onto a mandrel, a tube or the like.
  • a locking device is provided, after which the crank can be removed.
  • a guide device for axially guiding the spindles during the height adjustment is preferably provided at the level of the drive wheel and / or in the lower region of the frame of the crank block.
  • Both the pinion, which meshes with the drive wheel and the sprocket, which are arranged one above the other, are preferably mounted on the outside on a rotatable sleeve and are fixedly connected to it, for example welded. It is essential according to the invention that both the sleeve and the sprocket rotate with the driven pinion, so that the movement is transmitted to the spindle passed through the sleeve and via the chain also to the spindle on the other side of the trestle.
  • the crank bracket consists of a frame with a lower part 10 with two feet 11 on each side, a lower horizontal cross strut 12, a vertical post 13 on each side and an upper horizontal cross member 14, which the two sides of the frame at the level of the crank connects with each other. (See Figures 1 and 2).
  • the crank bracket also has a height-adjustable upper part 15, consisting of an upper horizontal supporting beam 16, which absorbs the loads of the scaffold, and which rests on the vertical spindles 17 on both sides and to which pipe ends 18 are also arranged in a vertical arrangement at the ends .
  • the crank bracket according to the invention has a height adjustment device which can be actuated via the crank 19 and which comprises a self-locking thread in the area of the spindles 17 and thereby makes it possible for the loaded upper part 15 to stop even when the cranking activity is interrupted. This height adjustment device is explained in more detail below with reference to FIGS. 1, 3 and 4.
  • the crank 19 is in principle designed as a sleeve 20 which is horizontally removably attached to a mandrel 21 attached to the standpipe profile 13 of the lower part. After loosening a split pin 22 or the like, the sleeve 20 of the crank can be removed from the mandrel 21.
  • a vertically aligned drive wheel 23 is attached to the end of the sleeve 20. This drive wheel 23 meshes with a horizontally arranged pinion 24 which is fastened to the outside on a tubular sleeve 25, for example welded to it.
  • the crank with the drive wheel 23 rotates, the pinion 24 and the sleeve 25 also rotate.
  • a sprocket 26 is attached to the outside of the pinion 24 on this sleeve 25, which can also be welded to the sleeve 25, for example.
  • This sprocket 26 is a gearwheel over which a chain 27 runs horizontally, which runs over the entire width of the crank block in a cover 28 in the manner of a chain case.
  • This cover 28 is removable.
  • the course of the chain 27 can be seen from FIG.
  • a chain tensioner 29 is also provided for this chain. As can be seen, this chain 27 runs on the right over the sprocket 26 and on the left side of the crank block over a sprocket 30 of the same design. It is an endless revolving chain.
  • the tubular sleeve 25 is equipped with an internal thread which engages in the thread of the spindle 17.
  • This thread is a so-called rolling thread that is designed as a trapezoidal thread with a relatively large distance between the individual threads.
  • This rolling thread between the spindle 17 and sleeve 25 is self-locking. If the sleeve 25 is now rotated by actuating the crank 19, 20, this leads to a height adjustment of the spindle 17. This, in turn, brings about the height adjustment of the upper part 15 of the crank bracket.
  • the spindle 17 runs within the standpipe profile 13 of the frame of the lower part 10 of the crank block and ends at a distance from the floor below the cross strut 12.
  • a guide sleeve 31 is inserted for guiding the spindle 17, a bolt 32 also serving as an anti-rotation device for the spindle.
  • a further guide 33 for the spindle 17 is provided in the area below the sleeve 25, which is firmly connected to profile parts of the lower part 10 of the crank block. This prevents the spindle from vibrating.
  • the basically identical arrangement with spindle and sleeve is also provided on the opposite side of the crank bracket, but for safety reasons, among other things, the drive via the crank 19 is only possible on one side of the drawing on the right. Since the chain wheel 30 is also rotated on the opposite side via the chain 27, the sleeve also rotates there and the second spindle 17 (on the left in the drawing) is also moved upwards or downwards.
  • Suitable axial bearings 34 are provided for absorbing the axial load in the vertical direction and ensuring smooth running of the sleeve 25 with an internal thread under load (see FIG. 3).

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  • Architecture (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Movable Scaffolding (AREA)
  • Bridges Or Land Bridges (AREA)
  • Adornments (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Dowels (AREA)
  • Materials For Medical Uses (AREA)
  • Prostheses (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Seats For Vehicles (AREA)
  • Emergency Lowering Means (AREA)

Abstract

A horizontal upper supporting beam is provided for accommodation of the load. As height adjustment device, a crank is used and gear means are provided for transmission of the rotary movement of the crank in an up and down movement of the upper part of the scaffolding support. The gear means comprise a drive wheel connected with the crank (19), which meshes with a horizontal pinion arranged at right-angles to the drive wheel. The pinion is firmly connected with a casing with an inner thread. This inner thread engages in a self-blocking outer thread of a vertical spindle (17) positioned through the casing. The spindle at its upper end supports the height adjustment horizontal beam (16) of the upper part (15) of the scaffolding support.

Description

Die vorliegende Erfindung betrifft einen höhenverstellbaren Gerüstbock mit den Merkmalen nach dem Oberbegriff des Anspruchs 1.The present invention relates to a height-adjustable trestle with the features according to the preamble of claim 1.

Gerüstböcke dieser Art sind auch unter der Bezeichnung Kurbelgerüstböcke bekannt und werden für Arbeitsgerüste insbesondere auf dem Bausektor eingesetzt, wobei mehrere parallel hintereinander angeordnete Kurbelgerüstböcke dieser Art Gerüstbohlen für eine Arbeitsbühne aufnehmen. Die Arbeitsbühne kann dann durch die Höhenverstellung der Kurbelgerüstböcke in der Höhe verändert werden. Im allgemeinen müssen diese Kurbelgerüstböcke vergleichsweise hohe Lasten bis zu etwa 1500 kg aufnehmen.Scaffolding trestles of this type are also known as crank scaffolding trestles and are used for work scaffolding, in particular in the construction sector, with a plurality of crank scaffolding trestles of this type arranged in parallel one behind the other receiving scaffolding planks for a working platform. The height of the work platform can then be changed by adjusting the height of the crank frame. In general, these crank stands have to withstand comparatively high loads of up to around 1500 kg.

Bei einen bekannten höhenverstellbaren Gerüstbock (DE-A-42 05 621) wird für die Höhenverstellung eine horizontale Welle gedreht, auf der ein Sternrad sitzt, dessen Zähne in eine Lochreihe je eines gelochten Vierkantrohres des Oberteils des Gerüstbockes eingreifen. Wenn das Oberteil des Gerüstbockes eine Last trägt und die Arbeitshöhe des Gerüstes verändert werden soll, muß zunächst eine Verriegelungseinrichtung in Form eines Bolzens oder dergleichen gelöst werden, wobei der Bolzen durch eine Lochreihe gesteckt ist. Außerdem ist noch eine kippbare Rückschlagsicherung vorgesehen, die in das Sternrad eingreift und dieses damit blockiert. Erst nach Lösen dieser Rückschlagsicherung kann das Oberteil des Kurbelbocks heruntergelassen werden. Trotz dieser Sicherungseinrichtungen kann es bei unsachgemäßem Umgang bei den herkömmlichen Gerüstböcken zu Unfällen kommen. Wenn nämlich das Gerüstoberteil belastet ist und die Bedienungsperson die Lastsicherung und auch die Rückschlagsicherung gelöst hat, ist es unter Umständen nicht mehr möglich, mit der Kurbel das Gewicht des belasteten Gerüstbockoberteils zu halten und das Oberteil des Gerüstbockes saust herunter.In a known height-adjustable scaffolding trestle (DE-A-42 05 621), a horizontal shaft is rotated for the height adjustment, on which a star wheel is seated, the teeth of which engage in a row of holes in each of a perforated square tube of the upper part of the scaffolding trestle. If the upper part of the trestle carries a load and the working height of the scaffold is to be changed, a locking device in the form of a bolt or the like must first be released, the bolt being inserted through a row of holes. In addition, a tiltable kickback protection is provided which engages in the star wheel and thus blocks it. The upper part of the crank bracket can only be lowered after this anti-kickback device has been released. Despite these safety devices, improper handling of the conventional trestles can lead to accidents. If the upper part of the scaffold is loaded and the operator has released the load securing device and also the non-return safety device, it may no longer be possible to hold the weight of the loaded upper part of the scaffolding frame with the crank and the upper part of the scaffolding frame will drop down.

Weiterhin ist ein höhenverstellbarer Gerüstbock bekannt (US-A-1 647 432) bei dem der höhenverstellbare Balken auf zwei lotrechten Spindeln gestützt ist, deren Gewinde jeweils von einem Innengewinde eines Schneckenrades aufgenommen ist. Der selbstsperrend wirkende und synchrone Antrieb erfolgt über eine horizontale Welle mit in die Schneckenräder eingreifenden Schnecken. Da diese Art der getrieblichen Verbindung mit einer hohen Untersetzung verbunden ist, erfordert die Höhenverstellung des Gerüstbockes einen relativ hohen Zeitaufwand.Furthermore, a height-adjustable trestle is known (US-A-1 647 432) in which the height-adjustable beam is divided into two vertical spindles is supported, the thread of which is received by an internal thread of a worm wheel. The self-locking and synchronous drive takes place via a horizontal shaft with worms engaging in the worm gears. Since this type of gear connection is associated with a high reduction, the height adjustment of the trestle requires a relatively large amount of time.

Die Aufgabe der Erfindung ist darin zu sehen einen höhenverstellbaren Gerüstbock dieser Art so auszubilden, daß er bei Wahrung der erforderlichen Sicherheit durch Selbstsperrung in einem geringeren Zeitaufwand als bei dem vorgenannten Stand der Technik der Höhe nach verstellt werden kann.The object of the invention is to be seen in designing a height-adjustable trestle of this type in such a way that it can be adjusted in less time than in the aforementioned prior art, while maintaining the required security by self-locking.

Diese Aufgabe wird durch einen Gerüstbock mit den Merkmalen nach dem Anspruch 1 gelöst.This object is achieved by a trestle with the features of claim 1.

Die Unteransprüche haben weitere Ausgestaltungen bzw. bevorzugte Ausführungsformen dieser Lösung zum Inhalt.The subclaims have further refinements or preferred embodiments of this solution.

Bei dem erfindungsgemäßen Gerüstbock weist der Spindelantrieb für die Höhenverstellung des Oberteils ein selbsthemmendes Gewinde auf, so daß auch das belastete Oberteil nicht von selbst herunterfahren kann und ein Absenken des belasteten Gerüstbockes nur bei Betätigung der Kurbel möglich ist. Die Getriebemittel sind dabei so gewählt, daß aufgrund eines günstigen Übersetzungsverhältnisses auch bei maximal belasteten Oberteil des Gerüstbockes ein relativ schnelles Hochfahren bzw. Herunterfahren mittels der Kurbel per Hand möglich ist. Gegebenenfalls kann aber auch der Handkurbelantrieb durch einen elektromotorischen Antrieb ersetzt werden.In the scaffolding trestle according to the invention, the spindle drive for the height adjustment of the upper part has a self-locking thread, so that the loaded upper part cannot move down by itself and lowering the loaded scaffolding trestle is only possible when the crank is actuated. The gear means are chosen so that due to a favorable transmission ratio, even with the top part of the scaffold frame loaded to a maximum, a relatively rapid start-up or shutdown by hand is possible by means of the crank. If necessary, the hand crank drive can also be replaced by an electric motor drive.

Damit die Höhenverstellung des Oberteils des Gerüstbocks an beiden Seiten gleichmäßig erfolgt, ist gemäß einer bevorzugten Weiterbildung der Erfindung vorgesehen, daß beide Spindel bewegungsmäßig gekoppelt sind über eine endlose Kette oder dergleichen, die über zwei jeweils einer Spindel zugeordnete Kettenräder läuft, wobei das eine dieser Kettenräder durch Drehung des mit der Kurbel verbundenen Antriebsrads ebenfalls angetrieben wird. Das Ansetzen der Kurbel ist bei dem erfindungsgemäßen Gerüstbock nur an einer Seite möglich.So that the height adjustment of the upper part of the trestle takes place evenly on both sides, it is provided according to a preferred development of the invention that both Spindle are coupled in terms of movement via an endless chain or the like, which runs over two sprockets each associated with a spindle, one of these sprockets by rotating the with the Crank connected drive wheel is also driven. In the scaffolding trestle according to the invention, the crank can only be attached on one side.

Die Kurbel ist vorzugsweise abnehmbar und umfaßt eine Hülse, mit der endseitig das Antriebsrad verbunden ist und die auf einen Dorn, ein Rohr oder dergleichen aufsteckbar ist. Außerdem ist eine Verriegelungseinrichtung vorgesehen, nach deren Lösen die Kurbel abgenommen werden kann.The crank is preferably removable and comprises a sleeve to which the drive wheel is connected at the end and which can be plugged onto a mandrel, a tube or the like. In addition, a locking device is provided, after which the crank can be removed.

Damit vermieden wird, daß die relativ langen Spindeln bei der Höhenverstellung klappern oder in Schwingungen versetzt werden, ist vorzugsweise in Höhe des Antriebsrads und/oder im unteren Bereich des Gestells des Kurbelbocks jeweils eine Führungseinrichtung für eine axiale Führung der Spindeln bei der Höhenverstellung vorgesehen.To prevent the relatively long spindles from rattling or vibrating during the height adjustment, a guide device for axially guiding the spindles during the height adjustment is preferably provided at the level of the drive wheel and / or in the lower region of the frame of the crank block.

Vorzugsweise sind sowohl das Ritzel, das mit dem Antriebsrad kämmt als auch das Kettenrad übereinander angeordnet außen auf einer drehbaren Hülse angebracht und mit dieser fest verbunden, z.B. verschweißt. Wesentlich ist gemäß der Erfindung, daß sich mit dem angetriebenen Ritzel sowohl die Hülse als auch das Kettenrad mitdreht, so daß die Bewegung auf die durch die Hülse hindurchgeführte Spindel und über die Kette auch auf die Spindel auf der anderen Seite des Gerüstbocks übertragen wird.Both the pinion, which meshes with the drive wheel and the sprocket, which are arranged one above the other, are preferably mounted on the outside on a rotatable sleeve and are fixedly connected to it, for example welded. It is essential according to the invention that both the sleeve and the sprocket rotate with the driven pinion, so that the movement is transmitted to the spindle passed through the sleeve and via the chain also to the spindle on the other side of the trestle.

Im folgenden wird die vorliegende Erfindung anhand eines Ausführungsbeispiels unter Bezugnahme auf die beiliegenden Zeichnungen näher beschrieben. Dabei zeigen

Fig. 1
eine schematisch vereinfachte Seitenansicht eines erfindungsgemäßen Kurbelbocks;
Fig. 2
eine Draufsicht auf den Kurbelbock gemäß Figur 1;
Fig. 3
eine Detailansicht des Ausschnitts III von Figur 1;
Fig. 4
eine Detailansicht des Ausschnitts IV von Figur 1 im Schnitt;
Fig. 5
eine stirnseitige Ansicht des Kurbelbocks in Richtung des Pfeils V von Figur 1 gesehen.
The present invention is described in more detail below using an exemplary embodiment and with reference to the accompanying drawings. Show
Fig. 1
a schematically simplified side view of a crank bracket according to the invention;
Fig. 2
a plan view of the crank bracket according to Figure 1;
Fig. 3
a detailed view of section III of Figure 1;
Fig. 4
a detailed view of section IV of Figure 1 in section;
Fig. 5
seen an end view of the crank block in the direction of arrow V of Figure 1.

Der erfindungsgemäße Kurbelbock besteht aus einem Rahmengestell mit einem Unterteil 10 mit zwei Standfüßen 11 an jeder Seite, einer unteren waagerechten Querstrebe 12, je einem vertikalen Pfosten 13 auf jeder Seite und einer oberen horizontalen Traverse 14, die die beiden Seiten des Rahmengestells in Höhe der Kurbel miteinander verbindet. (Siehe Figuren 1 und 2). Der Kurbelbock weist außerdem ein höhenverstellbares Oberteil 15 auf, bestehend aus einem oberen horizontalen tragenden Balken 16, der die Lasten des Gerüsts aufnimmt, und der an beiden Seiten auf den vertikalen Spindeln 17 ruht und an dem außerdem jeweils endseitig Rohrstutzen 18 in vertikaler Anordnung angebracht sind. Bei Betätigung der Kurbel 19, die von Hand oder aber auch bei Bedarf elektromotorisch erfolgen kann, wird das Oberteil 15 mit dem Balken 16 hochgefahren oder heruntergefahren, wobei dies bei dem erfindungsgemäßen Kurbelbock auch dann möglich ist, wenn der Balken 16 mit mehreren hundert Kilogramm belastet ist. Zu diesem Zweck weist der erfindungsgemäße Kurbelbock eine über die Kurbel 19 betätigbare Höhenverstelleinrichtung auf, die ein selbsthemmendes Gewinde im Bereich der Spindeln 17 umfaßt und dadurch ein Stehenbleiben auch des belasteten Oberteils 15 bei Unterbrechung der Kurbeltätigkeit möglich macht. Diese Höhenverstelleinrichtung wird nachfolgend unter Bezugnahme auf die Figuren 1, 3 und 4 näher erläutert. Wie aus Figur 3 ersichtlich ist, ist die Kurbel 19 im Prinzip als Hülse 20 ausgebildet, die horizontal auf einem am Standrohrprofil 13 des Unterteils befestigten Dorn 21 abnehmbar befestigt ist. Nach Lösen eines Splints 22 oder dergleichen kann die Hülse 20 der Kurbel von dem Dorn 21 abgenommen werden. Endseitig ist auf der Hülse 20 ein vertikal ausgerichtetes Antriebsrad 23 angebracht. Dieses Antriebsrad 23 kämmt mit einem horizontal angeordneten Ritzel 24, das außen auf einer rohrförmigen Hülse 25 befestigt ist, z.B. mit dieser verschweißt ist. Bei Drehung der Kurbel mit dem Antriebsrad 23 dreht sich somit das Ritzel 24 und auch die Hülse 25 mit. Nun ist oberhalb des Ritzels 24 auf dieser Hülse 25 außen noch ein Kettenrad 26 angebracht, das z.B. ebenfalls mit der Hülse 25 verschweißt sein kann. Dieses Kettenrad 26 ist ein Zahnrad, über das eine Kette 27 horizontal läuft, die über die gesamte Breite des Kurbelbocks in einer Abdeckung 28 nach Art eines Kettenkastens läuft. Diese Abdeckung 28 ist abnehmbar. Aus Figur 2 kann man den Verlauf der Kette 27 erkennen. Für diese Kette ist auch ein Kettenspanner 29 vorgesehen. Wie man sieht läuft diese Kette 27 rechts über das Kettenrad 26 und auf der linken Seite des Kurbelbocks über ein gleichgestaltetes Kettenrad 30. Es handelt sich um eine endlose umlaufende Kette.The crank bracket according to the invention consists of a frame with a lower part 10 with two feet 11 on each side, a lower horizontal cross strut 12, a vertical post 13 on each side and an upper horizontal cross member 14, which the two sides of the frame at the level of the crank connects with each other. (See Figures 1 and 2). The crank bracket also has a height-adjustable upper part 15, consisting of an upper horizontal supporting beam 16, which absorbs the loads of the scaffold, and which rests on the vertical spindles 17 on both sides and to which pipe ends 18 are also arranged in a vertical arrangement at the ends . When the crank 19 is actuated, which can be done by hand or by means of an electric motor, the upper part 15 is raised with the bar 16 or shut down, which is also possible with the crank bracket according to the invention when the beam 16 is loaded with several hundred kilograms. For this purpose, the crank bracket according to the invention has a height adjustment device which can be actuated via the crank 19 and which comprises a self-locking thread in the area of the spindles 17 and thereby makes it possible for the loaded upper part 15 to stop even when the cranking activity is interrupted. This height adjustment device is explained in more detail below with reference to FIGS. 1, 3 and 4. As can be seen from Figure 3, the crank 19 is in principle designed as a sleeve 20 which is horizontally removably attached to a mandrel 21 attached to the standpipe profile 13 of the lower part. After loosening a split pin 22 or the like, the sleeve 20 of the crank can be removed from the mandrel 21. A vertically aligned drive wheel 23 is attached to the end of the sleeve 20. This drive wheel 23 meshes with a horizontally arranged pinion 24 which is fastened to the outside on a tubular sleeve 25, for example welded to it. When the crank with the drive wheel 23 rotates, the pinion 24 and the sleeve 25 also rotate. Now, a sprocket 26 is attached to the outside of the pinion 24 on this sleeve 25, which can also be welded to the sleeve 25, for example. This sprocket 26 is a gearwheel over which a chain 27 runs horizontally, which runs over the entire width of the crank block in a cover 28 in the manner of a chain case. This cover 28 is removable. The course of the chain 27 can be seen from FIG. A chain tensioner 29 is also provided for this chain. As can be seen, this chain 27 runs on the right over the sprocket 26 and on the left side of the crank block over a sprocket 30 of the same design. It is an endless revolving chain.

Wird nun mit Hilfe der Kurbel über das Antriebsrad 23 und das Ritzel 24 die Hülse 25 gedreht, dann dreht sich das auf der Hülse befindliche Kettenrad 26 ebenfalls mit und über die Kette 27 wird diese Drehbewegung noch auf das Kettenrad 30 auf der gegenüberliegenden Seite des Kurbelbocks übertragen, so daß eine gleichzeitige Höhenverstellung des Kurbelbocks an beiden Seiten gewährleistet ist.If the sleeve 25 is now rotated with the help of the crank via the drive wheel 23 and the pinion 24, then the sprocket 26 located on the sleeve also rotates and via the chain 27 this rotary movement is still applied to the sprocket 30 on the opposite side of the crank block transferred so that a simultaneous height adjustment of the crank frame is guaranteed on both sides.

Die rohrförmige Hülse 25 ist mit einem Innengewinde ausgestattet, das in das Gewinde der Spindel 17 eingreift. Es handelt sich bei diesem Gewinde um ein sogenanntes Rollgewinde das als Trapezgewinde ausgebildet ist mit relativ großem Abstand der einzelnen Gewindegänge. Dieses Rollgewinde zwischen Spindel 17 und Hülse 25 ist selbsthemmend. Wird nun durch Betätigung der Kurbel 19, 20 die Hülse 25 gedreht, dann führt dies zu einer Höhenverstellung der Spindel 17. Dies wiederum bewirkt die Höhenverstellung des Oberteils 15 des Kurbelbocks. Wie man aus Figur 1 erkennt läuft die Spindel 17 innerhalb des Standrohrprofils 13 des Gestells des Unterteils 10 des Kurbelbocks und endet in einigem Abstand vom Boden unterhalb der Querstrebe 12. Wie man aus der Detailansicht Figur 4 erkennen kann, ist in dem Standrohrprofil 13, das ein Vierkantrohr ist, eine Führungshülse 31 für die Führung der Spindel 17 eingelassen, wobei außerdem ein Bolzen 32 als Verdrehschutz für die Spindel dient. Wie man aus Figur 3 erkennen kann ist im Bereich unterhalb der Hülse 25 eine weitere Führung 33 für die Spindel 17 vorgesehen, die mit Profilteilen des Unterteils 10 des Kurbelbocks fest verbunden ist. Dadurch werden Schwingungen der Spindel vermieden. Die im Prinzip gleiche Anordnung mit Spindel und Hülse ist auch auf der gegenüberliegenden Seite des Kurbelbocks vorgesehen, wobei jedoch u.a. aus sicherheitstechnischen Gründen der Antrieb über die Kurbel 19 nur an der einen in der Zeichnung rechten Seite möglich ist. Da auf der gegenüberliegenden Seite über die Kette 27 das Kettenrad 30 mitgedreht wird, dreht sich auch dort die Hülse mit und auch die zweite Spindel 17 (in der Zeichnung links) wird aufwärts bzw. abwärts bewegt.The tubular sleeve 25 is equipped with an internal thread which engages in the thread of the spindle 17. This thread is a so-called rolling thread that is designed as a trapezoidal thread with a relatively large distance between the individual threads. This rolling thread between the spindle 17 and sleeve 25 is self-locking. If the sleeve 25 is now rotated by actuating the crank 19, 20, this leads to a height adjustment of the spindle 17. This, in turn, brings about the height adjustment of the upper part 15 of the crank bracket. As can be seen from Figure 1, the spindle 17 runs within the standpipe profile 13 of the frame of the lower part 10 of the crank block and ends at a distance from the floor below the cross strut 12. As can be seen from the detailed view in Figure 4, in the standpipe profile 13 is that is a square tube, a guide sleeve 31 is inserted for guiding the spindle 17, a bolt 32 also serving as an anti-rotation device for the spindle. As can be seen from Figure 3, a further guide 33 for the spindle 17 is provided in the area below the sleeve 25, which is firmly connected to profile parts of the lower part 10 of the crank block. This prevents the spindle from vibrating. The basically identical arrangement with spindle and sleeve is also provided on the opposite side of the crank bracket, but for safety reasons, among other things, the drive via the crank 19 is only possible on one side of the drawing on the right. Since the chain wheel 30 is also rotated on the opposite side via the chain 27, the sleeve also rotates there and the second spindle 17 (on the left in the drawing) is also moved upwards or downwards.

Für die Aufnahme der axialen Belastung in vertikaler Richtung und der Gewährleistung eines Leichtlaufs der Hülse 25 mit Innengewinde unter Belastung sind geeignete Axiallager 34 vorgesehen (siehe Fig. 3).Suitable axial bearings 34 are provided for absorbing the axial load in the vertical direction and ensuring smooth running of the sleeve 25 with an internal thread under load (see FIG. 3).

Claims (6)

  1. Height-extendable trestle the frame of which comprises a lower part (10) with two spread supporting legs (11) at each side and an upper part (15) height-extendable relatively to the lower part with an upper supporting beam (16) for carrying the loads which is horizontal in the position of use, a crank handle (19) serving as device for height-extension and gear elements being provided for the transmission of the rotational movement of the crank handle into an up and down movement of the upper part of the trestle, the gear elements engaging in a spindle (17) which is vertical in the position of use and which carries at its upper end the beam (16) extending horizontally in the position of use of the upper part of the trestle,
    characterised in that the gear elements comprise a vertically aligned driving wheel (23) connected to the crank handle (19) and being in engagement with a pinion (24) arranged rectangularly relative to the driving wheel and being horizontal in the position of use, said pinion being stationarily connected to a sleeve (25) having internal threads and the threads of the sleeve engaging in self-locking external threads of the spindle (17).
  2. Trestle as claimed in claim 1, characterised in that two parallel spindles (17) are provided which carry the upper horizontal beam (16) of the upper part of the trestle, the height-extendability of both spindles being coupled as regards their motion via an endless chain (27) or the like which runs over two chain wheels (26) associated with one spindle (17), one of these chain wheels being likewise driven by turning the driving wheel (23) connected to the crank handle (19).
  3. Height-extendable trestle as claimed in claim 1 or 2, characterised in that the crank handle (19) comprises a sleeve (20) the end of which is connected to the driving wheel (23) and that the sleeve is mounted on a pin or the like and detachable from the latter after releasing a locking device (22).
  4. Height-extendable trestle as claimed in any one of claims 1 to 3, characterised in that for the spindles (17) there are provided approximately at the level of the driving wheel (23) and/or in the lower region of the frame of the crank trestle in each case guiding devices (31, 33) for an axial guidance during the height extension.
  5. Height-extendable trestle as claimed in any one of claims 1 to 4, characterised in that both the pinion (24) and the chain wheel (26) are welded one above the other on the outside of the turnable sleeve (25) which is driven by the driving wheel (23).
  6. Height-extendable trestle as claimed in any one of claims 1 to 5, characterised in that for the turnable sleeve (25) there is arranged a suitable axial bearing (34) underneath said sleeve.
EP95101316A 1994-02-05 1995-02-01 Height-extendable trestle Expired - Lifetime EP0666387B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4403617A DE4403617C2 (en) 1994-02-05 1994-02-05 Height-adjustable trestle
DE4403617 1994-02-05

Publications (2)

Publication Number Publication Date
EP0666387A1 EP0666387A1 (en) 1995-08-09
EP0666387B1 true EP0666387B1 (en) 1996-08-14

Family

ID=6509568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101316A Expired - Lifetime EP0666387B1 (en) 1994-02-05 1995-02-01 Height-extendable trestle

Country Status (6)

Country Link
EP (1) EP0666387B1 (en)
AT (1) ATE141372T1 (en)
CZ (1) CZ26295A3 (en)
DE (2) DE4403617C2 (en)
HU (1) HUT70602A (en)
PL (1) PL307081A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2354790B (en) * 1999-08-28 2004-02-11 Neil Ernest Allen A support for a scaffolding platform

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647432A (en) * 1926-03-03 1927-11-01 George D Butler Trestle
US2140617A (en) * 1937-06-15 1938-12-20 Castady Harry Adjustable scaffold
US4468904A (en) * 1983-04-14 1984-09-04 Malley James J O Multi-stage extendable tower
FR2607535B1 (en) * 1986-11-28 1990-02-23 Trouillet Andre MOBILE PLATFORM SCAFFOLDING
DE9012976U1 (en) * 1990-09-12 1991-10-17 Hymer-Leichtmetallbau, 7988 Wangen Height and side adjustable support stand
DE9115455U1 (en) * 1991-12-13 1992-02-20 Albert, Erich, 8752 Edelbach Height-adjustable scaffolding trestle for creating a work platform

Also Published As

Publication number Publication date
DE4403617C2 (en) 1996-03-14
HUT70602A (en) 1995-10-30
ATE141372T1 (en) 1996-08-15
CZ26295A3 (en) 1996-08-14
HU9500342D0 (en) 1995-03-28
EP0666387A1 (en) 1995-08-09
DE59500008D1 (en) 1996-09-19
PL307081A1 (en) 1995-08-07
DE4403617A1 (en) 1995-08-10

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