EP1785118A2 - Hydraulic column brake - Google Patents

Hydraulic column brake Download PDF

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Publication number
EP1785118A2
EP1785118A2 EP06123444A EP06123444A EP1785118A2 EP 1785118 A2 EP1785118 A2 EP 1785118A2 EP 06123444 A EP06123444 A EP 06123444A EP 06123444 A EP06123444 A EP 06123444A EP 1785118 A2 EP1785118 A2 EP 1785118A2
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EP
European Patent Office
Prior art keywords
foot
column
plate
clamping
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06123444A
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German (de)
French (fr)
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EP1785118A3 (en
EP1785118B1 (en
Inventor
Rolf Revenus
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Maquet GmbH
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Maquet GmbH
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Priority to PL06123444T priority Critical patent/PL1785118T3/en
Publication of EP1785118A2 publication Critical patent/EP1785118A2/en
Publication of EP1785118A3 publication Critical patent/EP1785118A3/en
Application granted granted Critical
Publication of EP1785118B1 publication Critical patent/EP1785118B1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/02—Adjustable operating tables; Controls therefor
    • A61G13/04—Adjustable operating tables; Controls therefor tiltable around transverse or longitudinal axis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/02—Adjustable operating tables; Controls therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A61G13/101—Clamping means for connecting accessories to the operating table

Definitions

  • the present invention relates to an operating table comprising a pedestal column having a pedestal and a column head, and a bearing surface connectable or connected to the column head.
  • the bearing surface is rotatable about the vertical longitudinal axis of the table column in order to bring it to a suitable position, depending on the space required or the type of surgical procedure to be performed. In this appropriate position, the bearing surface must then be locked with respect to the rotation about the vertical table column axis.
  • a rotatability of the bearing surface about the vertical column axis can be achieved, for example, that a column-side portion of the column base is rotatably mounted on a floor-side portion of the column foot, and the two sections of the column foot can then be clamped for locking the position of the bearing surface with a mechanical clamping mechanism ,
  • the invention has for its object to provide an operating table of the type mentioned above, which allows a locking of the bearing surface with respect to a rotation about the longitudinal axis of the table column with simple means.
  • the pedestal has a floor-side base plate and a column-side base plate, that the base plate is rotatably mounted on the bottom plate and secured with a vertical clearance against lifting of the bottom plate by an abutment and that at least one pressure-operated clamping cylinder is provided to tension the footplate against the abutment.
  • the clamping force is applied by a pressure-actuated clamping cylinder.
  • This clamping force is therefore adjusted by the pressure of the pressure fluid of the clamping cylinder and not on the dimensioning of a mechanical stroke or the like, so that the clamping force can be adjusted easily and yet precise, without placing particularly high demands on the installation tolerance.
  • the pressurized fluid can be passed via suitable lines over any paths, so that such lines, unlike, for example, a mechanical shaft, other components of the pedestal are not in the way.
  • the clamping cylinder is arranged on the base plate and it is supported when acted upon by the pressure medium on the bottom plate.
  • the abutment is formed by a circular ring connected to the base plate, which surrounds the foot plate and at least partially overlaps it at its outer edge.
  • the at least one clamping cylinder can be acted upon by a foot-operated pump with pressurized fluid.
  • a foot-operated pump makes it possible to produce a sufficiently high clamping force with little effort.
  • the line between the pump and the clamping cylinder is connected via a pressure relief valve with a tank for the pressurized fluid.
  • a pedestal 10 for a table column of a surgical table is shown in a perspective view, and in Fig. 2, the pedestal 10 is shown in a section along the line A-A of Fig. 1.
  • the pedestal 10 includes a floor-side floor panel 12 (see FIG. 2) and a column-side foot panel 14.
  • the foot panel 14 is continued vertically upward through a desk-column section 16.
  • Other components of the table column, a column head of the table column and connectable or connected to the column head bearing surface are not shown in the figures.
  • the foot plate 14 is rotatably mounted about a vertical axis 18 on the floor-bottom plate 12.
  • the bearing is formed by a ball track 20, which can be seen in the cross-sectional view of FIG.
  • a circular ring 22 is fixed with bolts 23.
  • the annulus 22 has an inwardly directed projection 24 which engages over the foot plate 14 at its outer edge portion 26.
  • the projection 24 of the circular ring 22 forms an abutment for the outer edge portion 26 of the bottom plate 12, which prevents the foot plate 14 from lifting off the bottom plate 12.
  • a vertical play Between the projection 24 of the annulus 22 and the outer edge portion 26 of the bottom plate 12 is a vertical play, so that the base plate 14 normally, that is, if not clamped in a manner described in more detail below, can be rotated about the vertical axis 18, without To be substantially braked by frictional contact with the projection 24.
  • a foot-operated pump 28 is further arranged, which is shown separately in Fig. 3 in a perspective view.
  • the pump 28 has a foot lever 30, at the end of which a foot pedal 32 is arranged.
  • a pump shaft 34 is rotated via the foot lever 30.
  • a longer working cam 36 and a shorter Entsperrnocken 38 are arranged, the function of which will be described below.
  • the pump 28 is connected via hydraulic lines 40 with two hydraulic clamping cylinders 42 which are arranged on the base plate 14 (see Fig. 1 and Fig. 2).
  • the pump 28 and the hydraulic clamping cylinder 42 are connected via a hydraulic circuit, which is shown schematically in Fig. 4 and will be described below together with the clamping function of the column foot 10.
  • the foot plate 14 may be rotated about the vertical axis 18 relative to the bottom plate 12 as mentioned above. Thereby, a bearing surface (not shown) fixed to a column head of the table pillar (not shown) can be turned to an appropriate position. When the bearing surface has been rotated to a suitable position, the foot plate 14 is clamped to the bottom plate 12 as follows to lock the bearing surface in rotation about the vertical axis 18.
  • the foot pedal 32 of the foot lever 30 is entered.
  • the pump 28 is actuated via the working cam 36, and hydraulic oil is sucked from a hydraulic oil tank 44 (see FIG. 4) via a suction valve 46.
  • the thus sucked hydraulic oil is pumped via a check valve 48 and the hydraulic line 40 into the hydraulic clamping cylinder 42, the piston 43 (see FIG. 2) are thereby extended and supported on the bottom plate 12.
  • the base plate 14 With increasing pressure in the hydraulic line 40, the base plate 14 is raised, whereby it is stretched with its outer edge portions 26 against the projection 24 of the circular ring 22. In this condition the foot plate 14 is clamped to the annulus 22 and can not be rotated about the vertical axis 18.
  • the check valve 48 ensures that the pressure in the conduit 40 is maintained even after completion of the pumping and the base plate 14 thus remains clamped on the annular plate 22 on the bottom plate 12.
  • a relief valve or pressure limiting valve 50 is arranged between the pump 28 and the check valve 48.
  • This relief valve 50 is such that it opens to the hydraulic oil tank 44 when the pressure between the pump 28 and the check valve 48 exceeds a predetermined maximum pressure. This ensures that the pressure in the line 40, which is supplied to the clamping cylinders 42, never exceeds this predetermined maximum pressure.
  • the base plate 14 is always clamped independent of installation tolerances of the clamping cylinder 42 with a predetermined maximum clamping force corresponding to the maximum pressure of the relief valve 50 to the bottom plate 12. In particular, it is ensured that the clamping mechanism is not overloaded by excessive clamping pressure.
  • the foot pedal 32 (see FIGS. 1 and 3) is raised with the foot.
  • the Entsperrnocken 38 is moved in the illustration of FIG. 2 in a clockwise direction until it abuts an actuating portion 52 (see FIG. 2) of a Entsperrventils 54 which connects the hydraulic line 40 with the hydraulic oil tank 44 (see FIG. 4) ,
  • the Entsperrnocken 38 abuts the actuating portion 52 of the Entsperrventils 54
  • this is opened, whereby hydraulic oil escapes from the hydraulic line 40 into the hydraulic oil tank 44 and the pressure with which the clamping cylinder 42 are applied, decreases.
  • the pistons 43 of the clamping cylinder 42 are retracted, the base plate 14 lowers and the clamping effect between the base plate 14 and bottom plate 12 is released.
  • a high clamping effect can be generated with low operating forces.
  • the clamping mechanism is insensitive to manufacturing and installation tolerances, since the system is not aimed at achieving a predetermined stroke of the piston 43 of the clamping cylinder 42, but to achieve a maximum clamping pressure, which can be easily prepared by means of the relief valve 50.
  • the hydraulic clamping system described here is distinguished from previously customary purely mechanical solutions by a small space.
  • the hydraulic oil can be passed with the line 42 through any paths, so that the lines 40, unlike, for example, a commonly used mechanical shaft, other components are not in the way. In particular, the space between the two clamping cylinders 52 remains free.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

The table has a table column with a column foot and with a column head, where the column foot has a floor-side baseplate (12) and a column-side footplate (14). The footplate is mounted rotatably on the baseplate and is secured with a vertical play by an abutment against lifted oil from the baseplate. A pressure-actuated clamping cylinder (42) is provided in order to clamp the footplate against the abutment. The abutment is formed by a circular ring (22) that is connected to the baseplate, where the cylinder is acted upon by pressure fluid via a foot-actuated pump (28).

Description

Die vorliegende Erfindung betrifft einen Operationstisch, der eine Tischsäule mit einem Säulenfuß und einem Säulenkopf sowie eine mit dem Säulenkopf verbindbare oder verbundene Lagerfläche umfasst.The present invention relates to an operating table comprising a pedestal column having a pedestal and a column head, and a bearing surface connectable or connected to the column head.

Bei manchen derartigen Operationstischen ist die Lagerfläche um die vertikale Längsachse der Tischsäule drehbar, um sie je nach Platzbedarf oder Art des durchzuführenden chirurgischen Eingriffs in eine geeignete Stellung zu bringen. In dieser geeigneten Stellung muss die Lagerfläche dann bezüglich der Drehung um die vertikale Tischsäulenachse arretiert werden.In some such operating tables, the bearing surface is rotatable about the vertical longitudinal axis of the table column in order to bring it to a suitable position, depending on the space required or the type of surgical procedure to be performed. In this appropriate position, the bearing surface must then be locked with respect to the rotation about the vertical table column axis.

Eine Drehbarkeit der Lagerfläche um die vertikale Tischsäulenachse kann beispielsweise dadurch erreicht werden, dass ein säulenseitiger Abschnitt des Säulenfußes drehbar auf einem fußbodenseitigen Abschnitt des Säulenfußes gelagert ist, und die beiden Abschnitte des Säulenfußes können dann zum Arretieren der Lage der Lagerfläche mit einem mechanischen Klemmmechanismus verklemmt werden.A rotatability of the bearing surface about the vertical column axis can be achieved, for example, that a column-side portion of the column base is rotatably mounted on a floor-side portion of the column foot, and the two sections of the column foot can then be clamped for locking the position of the bearing surface with a mechanical clamping mechanism ,

Bei mechanischen Klemmmechanismen tritt jedoch das Problem auf, dass es schwierig ist, die Klemmkraft präzise zu bemessen. Bei mechanischen Klemmvorrichtungen, bei denen die Klemmkraft unmittelbar mit der mechanischen Verstellung eines Klemmelementes zusammenhängt, dürfen diese Klemmelemente nur mit sehr geringer Einbautoleranz eingebaut werden, weil sich eine Abweichung der Einbaulage unmittelbar auf die Klemmkraft auswirkt. Da sowohl eine zu geringe als auch eine zu starke Klemmkraft unbedingt zu vermeiden ist, müssen mechanische Klemmvorrichtungen mit großer Präzision und damit verbundenem hohen Aufwand hergestellt werden.In mechanical clamping mechanisms, however, the problem arises that it is difficult to precisely measure the clamping force. In mechanical clamping devices in which the clamping force is directly related to the mechanical adjustment of a clamping element, these clamping elements may be installed only with very low installation tolerance, because a deviation of the mounting position directly affects the clamping force. Since both too low and too strong a clamping force must be avoided, mechanical clamping devices must be produced with great precision and the associated high cost.

Der Erfindung liegt die Aufgabe zugrunde, einen Operationstisch der eingangs genannten Art anzugeben, der eine Arretierung der Lagerfläche bezüglich einer Drehung um die Längsachse der Tischsäule mit einfachen Mitteln ermöglicht.The invention has for its object to provide an operating table of the type mentioned above, which allows a locking of the bearing surface with respect to a rotation about the longitudinal axis of the table column with simple means.

Diese Aufgabe wird dadurch gelöst, dass der Säulenfuß eine fußbodenseitige Bodenplatte und eine säulenseitige Fußplatte hat, dass die Fußplatte auf der Bodenplatte drehbar gelagert und mit einem vertikalen Spiel gegen ein Abheben von der Bodenplatte durch ein Widerlager gesichert ist und dass mindestens ein druckbetätigter Klemmzylinder vorgesehen ist, um die Fußplatte gegen das Widerlager zu spannen.This object is achieved in that the pedestal has a floor-side base plate and a column-side base plate, that the base plate is rotatably mounted on the bottom plate and secured with a vertical clearance against lifting of the bottom plate by an abutment and that at least one pressure-operated clamping cylinder is provided to tension the footplate against the abutment.

Bei dem erfindungsgemäßen Operationstisch wird die Klemmkraft durch einen druckbetätigten Klemmzylinder aufgebracht. Diese Klemmkraft wird demnach über den Druck des Druckfluids des Klemmzylinders eingestellt und nicht über die Bemessung eines mechanischen Hubwegs oder dergleichen, so dass sich die Klemmkraft einfach und dennoch präzise einstellen lässt, ohne besonders hohe Anforderungen an die Einbautoleranz zu stellen. Ferner ergeben sich für den Aufbau des Säulenfußes erhöhte Freiheiten, weil das Druckfluid über geeignete Leitungen über beliebige Wege geleitet werden kann, so dass derartige Leitungen, anders als beispielsweise eine mechanische Welle, übrigen Komponenten des Säulenfußes nicht im Wege sind.In the operating table according to the invention, the clamping force is applied by a pressure-actuated clamping cylinder. This clamping force is therefore adjusted by the pressure of the pressure fluid of the clamping cylinder and not on the dimensioning of a mechanical stroke or the like, so that the clamping force can be adjusted easily and yet precise, without placing particularly high demands on the installation tolerance. Furthermore, there are increased freedoms for the construction of the pedestal, because the pressurized fluid can be passed via suitable lines over any paths, so that such lines, unlike, for example, a mechanical shaft, other components of the pedestal are not in the way.

Vorzugsweise ist der Klemmzylinder an der Fußplatte angeordnet und stützt er sich bei Beaufschlagung durch das Druckmittel an der Bodenplatte ab.Preferably, the clamping cylinder is arranged on the base plate and it is supported when acted upon by the pressure medium on the bottom plate.

In einer vorteilhaften Weiterbildung wird das Widerlager von einem mit der Bodenplatte verbundenen Kreisring gebildet, der die Fußplatte umgibt und diese an ihrem äußeren Rand mindestens teilweise übergreift.In an advantageous development, the abutment is formed by a circular ring connected to the base plate, which surrounds the foot plate and at least partially overlaps it at its outer edge.

Vorzugsweise ist der mindestens eine Klemmzylinder über eine fußbetätigte Pumpe mit Druckfluid beaufschlagbar. Durch eine derartige fußbetätigte Pumpe lässt sicht mit geringem Kraftaufwand eine ausreichend hohe Klemmkraft herstellen.Preferably, the at least one clamping cylinder can be acted upon by a foot-operated pump with pressurized fluid. Such a foot-operated pump makes it possible to produce a sufficiently high clamping force with little effort.

In einer besonders vorteilhaften Weiterbildung ist die Leitung zwischen der Pumpe und dem Klemmzylinder über ein Druckbegrenzungsventil mit einem Tank für das Druckfluid verbunden. Dadurch wird sichergestellt, dass egal wie ausgiebig die Pumpe betätigt wird, der Druck des Druckfluids, das in den Klemmzylinder eingeführt wird, einen Maximaldruck nicht überschreitet, welcher durch das Druckbegrenzungsventil festgelegt ist. Dadurch kann der Klemmmechanismus nicht überlastet werden, und es ist einfach, die Klemmkraft entsprechend dem Maximaldruck des Druckbegrenzungsventils einzustellen.In a particularly advantageous development, the line between the pump and the clamping cylinder is connected via a pressure relief valve with a tank for the pressurized fluid. This ensures that no matter how exhaustive the pump is actuated, the pressure of the pressurized fluid introduced into the clamping cylinder does not exceed a maximum pressure determined by the pressure relief valve. Thereby, the clamping mechanism can not be overloaded, and it is easy to adjust the clamping force according to the maximum pressure of the pressure relief valve.

Zum besseren Verständnis der vorliegenden Erfindung wird im Folgenden auf das in den Zeichnungen dargestellte bevorzugte Ausführungsbeispiel Bezug genommen, welches an Hand spezifischer Terminologie beschrieben ist. Es sei jedoch darauf hingewiesen, dass der Schutzumfang der Erfindung dadurch nicht eingeschränkt werden soll, da derartige Veränderungen und weitere Modifizierungen an der gezeigten Einrichtung sowie derartige weitere Anwendungen der Erfindung, wie sie darin aufgezeigt sind, als übliches derzeitiges und künftiges Fachwissen eines zuständigen Fachmanns angesehen werden. Die Figuren zeigen ein Ausführungsbeispiel der Erfindung, nämlich

Figur 1
eine perspektivische Ansicht eines Säulenfußes,
Figur 2
eine Querschnittsansicht des Säulenfußes entlang der Linie A-A von Figur 1,
Figur 3
eine perspektivische Ansicht einer fußbetätigten Pumpe, die mit zwei Klemmzylindern verbunden ist, und
Figur 4
eine schematische Darstellung eines Hydraulikschaltkreises.
For a better understanding of the present invention, reference will now be made to the preferred embodiment shown in the drawings, which is described by reference to specific terminology. It should be understood, however, that the scope of the invention should not be so limited since such alterations and other modifications to the illustrated device, as well as such other uses of the invention as set forth herein, are deemed to be the common present and future knowledge of a person skilled in the art become. The figures show an embodiment of the invention, namely
FIG. 1
a perspective view of a pedestal,
FIG. 2
3 is a cross-sectional view of the pedestal taken along the line AA of FIG. 1;
FIG. 3
a perspective view of a foot-operated pump, which is connected to two clamping cylinders, and
FIG. 4
a schematic representation of a hydraulic circuit.

In Fig. 1 ist ein Säulenfuß 10 für eine Tischsäule eines Operationstisches in einer perspektivischen Ansicht gezeigt, und in Fig. 2 ist der Säulenfuß 10 in einem Schnitt entlang der Linie A-A von Fig. 1 gezeigt.In Fig. 1, a pedestal 10 for a table column of a surgical table is shown in a perspective view, and in Fig. 2, the pedestal 10 is shown in a section along the line A-A of Fig. 1.

Der Säulenfuß 10 umfasst eine fußbodenseitige Bodenplatte 12 (siehe Fig. 2) und eine säulenseitige Fußplatte 14. Die Fußplatte 14 wird vertikal nach oben durch einen Tischsäulenabschnitt 16 fortgesetzt. Weitere Bestandteile der Tischsäule, ein Säulenkopf der Tischsäule und eine mit dem Säulenkopf verbindbare oder verbundene Lagerfläche sind in den Figuren nicht dargestellt.The pedestal 10 includes a floor-side floor panel 12 (see FIG. 2) and a column-side foot panel 14. The foot panel 14 is continued vertically upward through a desk-column section 16. Other components of the table column, a column head of the table column and connectable or connected to the column head bearing surface are not shown in the figures.

Die Fußplatte 14 ist um eine vertikale Achse 18 drehbar auf der fußbodenseitigen Bodenplatte 12 gelagert. Das Lager ist dabei durch eine Kugelbahn 20 gebildet, die in der Querschnittsansicht von Fig. 2 zu erkennen ist.The foot plate 14 is rotatably mounted about a vertical axis 18 on the floor-bottom plate 12. The bearing is formed by a ball track 20, which can be seen in the cross-sectional view of FIG.

An der fußbodenseitigen Bodenplatte 12 ist ein Kreisring 22 mit Bolzen 23 befestigt. Der Kreisring 22 hat eine nach innen gerichtete Auskragung 24, die die Fußplatte 14 an derem äußeren Randabschnitt 26 übergreift. Die Auskragung 24 des Kreisrings 22 bildet ein Widerlager für den äußeren Randabschnitt 26 der Bodenplatte 12, welches verhindert, dass sich die Fußplatte 14 von der Bodenplatte 12 abhebt. Zwischen der Auskragung 24 des Kreisrings 22 und dem äußeren Randabschnitt 26 der Bodenplatte 12 befindet sich ein vertikales Spiel, so dass die Fußplatte 14 normalerweise, d.h. wenn sie nicht auf unten näher beschriebene Weise festgeklemmt ist, um die vertikale Achse 18 gedreht werden kann, ohne durch Reibungskontakt mit der Auskragung 24 wesentlich gebremst zu werden.On the floor-side bottom plate 12, a circular ring 22 is fixed with bolts 23. The annulus 22 has an inwardly directed projection 24 which engages over the foot plate 14 at its outer edge portion 26. The projection 24 of the circular ring 22 forms an abutment for the outer edge portion 26 of the bottom plate 12, which prevents the foot plate 14 from lifting off the bottom plate 12. Between the projection 24 of the annulus 22 and the outer edge portion 26 of the bottom plate 12 is a vertical play, so that the base plate 14 normally, that is, if not clamped in a manner described in more detail below, can be rotated about the vertical axis 18, without To be substantially braked by frictional contact with the projection 24.

Auf der Fußplatte 14 ist ferner eine fußbetätigte Pumpe 28 angeordnet, die in Fig. 3 separat in einer perspektivischen Ansicht dargestellt ist. Wie in Fig. 1 und Fig. 3 zu sehen ist, hat die Pumpe 28 einen Fußhebel 30, an dessen Ende ein Fußpedal 32 angeordnet ist. Durch Niedertreten des Fußpedals 32 wird über den Fußhebel 30 eine Pumpenwelle 34 gedreht. Wie in Figuren 1 bis 3 zu sehen ist, sind an einem Ende der Pumpenwelle 34 ein längerer Arbeitsnocken 36 und ein kürzerer Entsperrnocken 38 angeordnet, deren Funktion unten beschrieben wird.On the foot plate 14, a foot-operated pump 28 is further arranged, which is shown separately in Fig. 3 in a perspective view. As can be seen in FIGS. 1 and 3, the pump 28 has a foot lever 30, at the end of which a foot pedal 32 is arranged. By depressing the foot pedal 32, a pump shaft 34 is rotated via the foot lever 30. As can be seen in Figures 1 to 3, at one end of the pump shaft 34, a longer working cam 36 and a shorter Entsperrnocken 38 are arranged, the function of which will be described below.

Die Pumpe 28 ist über Hydraulikleitungen 40 mit zwei Hydraulik-Klemmzylindern 42 verbunden, die an der Fußplatte 14 angeordnet sind (siehe Fig. 1 und Fig. 2).The pump 28 is connected via hydraulic lines 40 with two hydraulic clamping cylinders 42 which are arranged on the base plate 14 (see Fig. 1 and Fig. 2).

Die Pumpe 28 und die Hydraulik-Klemmzylinder 42 sind über einen Hydraulikkreis verbunden, der in Fig. 4 schematisch dargestellt ist und im Folgenden zusammen mit der Klemmfunktion des Säulenfußes 10 beschrieben wird.The pump 28 and the hydraulic clamping cylinder 42 are connected via a hydraulic circuit, which is shown schematically in Fig. 4 and will be described below together with the clamping function of the column foot 10.

Im nicht-festgeklemmten Zustand kann die Fußplatte 14 wie oben erwähnt relativ zur Bodenplatte 12 um die vertikale Achse 18 gedreht werden. Dadurch kann eine Lagerfläche (nicht gezeigt), die an einem Säulenkopf der Tischsäule (nicht gezeigt) befestigt ist, in eine geeignete Stellung gedreht werden. Wenn die Lagerfläche in eine geeignete Stellung gedreht wurde, wird die Fußplatte 14 wie folgt an der Bodenplatte 12 festgeklemmt, um die Lagerfläche bezüglich der Drehung um die vertikale Achse 18 zu arretieren.In the unclamped condition, the foot plate 14 may be rotated about the vertical axis 18 relative to the bottom plate 12 as mentioned above. Thereby, a bearing surface (not shown) fixed to a column head of the table pillar (not shown) can be turned to an appropriate position. When the bearing surface has been rotated to a suitable position, the foot plate 14 is clamped to the bottom plate 12 as follows to lock the bearing surface in rotation about the vertical axis 18.

Zum Festklemmen oder Feststellen der Fußplatte 14 wird das Fußpedal 32 des Fußhebels 30 getreten. Dadurch wird über den Arbeitsnocken 36 die Pumpe 28 betätigt, und Hydrauliköl wird aus einem Hydrauliköl-Tank 44 (siehe Fig. 4) über ein Ansaugventil 46 angesaugt. Das so angesaugte Hydrauliköl wird über ein Rückschlagventil 48 und die Hydraulikleitung 40 in die Hydraulik-Klemmzylinder 42 gepumpt, deren Kolben 43 (siehe Fig. 2) dadurch ausgefahren werden und sich an der Bodenplatte 12 abstützen. Mit zunehmendem Druck in der Hydraulikleitung 40 wird die Fußplatte 14 angehoben, wodurch sie mit ihren äußeren Randabschnitten 26 gegen die Auskragung 24 des Kreisrings 22 gespannt wird. In diesem Zustand ist die Fußplatte 14 an dem Kreisring 22 festgeklemmt und kann nicht mehr um die vertikale Achse 18 gedreht werden.For clamping or fixing the base plate 14, the foot pedal 32 of the foot lever 30 is entered. Thereby, the pump 28 is actuated via the working cam 36, and hydraulic oil is sucked from a hydraulic oil tank 44 (see FIG. 4) via a suction valve 46. The thus sucked hydraulic oil is pumped via a check valve 48 and the hydraulic line 40 into the hydraulic clamping cylinder 42, the piston 43 (see FIG. 2) are thereby extended and supported on the bottom plate 12. With increasing pressure in the hydraulic line 40, the base plate 14 is raised, whereby it is stretched with its outer edge portions 26 against the projection 24 of the circular ring 22. In this condition the foot plate 14 is clamped to the annulus 22 and can not be rotated about the vertical axis 18.

Das Rückschlagventil 48 sorgt dafür, dass der Druck in der Leitung 40 auch nach Beendigung des Pumpens aufrechterhalten bleibt und die Fußplatte 14 somit über den Kreisring 22 an der Bodenplatte 12 festgeklemmt bleibt.The check valve 48 ensures that the pressure in the conduit 40 is maintained even after completion of the pumping and the base plate 14 thus remains clamped on the annular plate 22 on the bottom plate 12.

Wie in Fig. 4 zu sehen ist, ist zwischen der Pumpe 28 und dem Rückschlagventil 48 ein Entlastungsventil oder Druckbegrenzungsventil 50 angeordnet. Dieses Entlastungsventil 50 ist so geartet, dass es sich zum Hydrauliköl-Tank 44 öffnet, wenn der Druck zwischen der Pumpe 28 und dem Rückschlagventil 48 einen vorbestimmten Maximaldruck übersteigt. Dadurch wird sichergestellt, dass der Druck in der Leitung 40, der den Klemmzylindern 42 zugeführt wird, diesen vorbestimmten Maximaldruck nie übersteigt.As can be seen in FIG. 4, a relief valve or pressure limiting valve 50 is arranged between the pump 28 and the check valve 48. This relief valve 50 is such that it opens to the hydraulic oil tank 44 when the pressure between the pump 28 and the check valve 48 exceeds a predetermined maximum pressure. This ensures that the pressure in the line 40, which is supplied to the clamping cylinders 42, never exceeds this predetermined maximum pressure.

Durch den beschriebenen Aufbau mit dem Entlastungsventil 50 wird die Fußplatte 14 unabhängig von Einbautoleranzen der Klemmzylinder 42 stets mit einer vorbestimmten maximalen Klemmkraft, die mit dem Maximaldruck des Entlastungsventils 50 korrespondiert, an der Bodenplatte 12 festgeklemmt. Insbesondere wird sichergestellt, dass der Klemmmechanismus nicht durch zu hohen Klemmdruck überlastet wird.Due to the construction described with the relief valve 50, the base plate 14 is always clamped independent of installation tolerances of the clamping cylinder 42 with a predetermined maximum clamping force corresponding to the maximum pressure of the relief valve 50 to the bottom plate 12. In particular, it is ensured that the clamping mechanism is not overloaded by excessive clamping pressure.

Zum Lösen der Klemmverbindung zwischen der Bodenplatte 12 und der Fußplatte 14 wird das Fußpedal 32 (siehe Fig. 1 und Fig. 3) mit dem Fuß angehoben. Dadurch wird der Entsperrnocken 38 in der Darstellung von Fig. 2 im Uhrzeigersinn bewegt, bis er an einem Betätigungsabschnitt 52 (siehe Fig. 2) eines Entsperrventils 54 anstößt, welches die Hydraulikleitung 40 mit dem Hydrauliköl-Tank 44 verbindet (siehe Fig. 4). Wenn der Entsperrnocken 38 am Betätigungsabschnitt 52 des Entsperrventils 54 anstößt, wird dieses geöffnet, wodurch Hydrauliköl aus der Hydraulikleitung 40 in den Hydrauliköl-Tank 44 entweicht und der Druck, mit dem die Klemmzylinder 42 beaufschlagt sind, abnimmt. Dadurch werden die Kolben 43 der Klemmzylinder 42 eingefahren, die Fußplatte 14 senkt sich ab und die Klemmwirkung zwischen Fußplatte 14 und Bodenplatte 12 wird aufgehoben.To release the clamping connection between the bottom plate 12 and the foot plate 14, the foot pedal 32 (see FIGS. 1 and 3) is raised with the foot. Thereby, the Entsperrnocken 38 is moved in the illustration of FIG. 2 in a clockwise direction until it abuts an actuating portion 52 (see FIG. 2) of a Entsperrventils 54 which connects the hydraulic line 40 with the hydraulic oil tank 44 (see FIG. 4) , When the Entsperrnocken 38 abuts the actuating portion 52 of the Entsperrventils 54, this is opened, whereby hydraulic oil escapes from the hydraulic line 40 into the hydraulic oil tank 44 and the pressure with which the clamping cylinder 42 are applied, decreases. As a result, the pistons 43 of the clamping cylinder 42 are retracted, the base plate 14 lowers and the clamping effect between the base plate 14 and bottom plate 12 is released.

Bei der gezeigten Ausführungsform des Säulenfußes 10 kann eine hohe Klemmwirkung mit geringen Bedienkräften erzeugt werden. Der Klemmmechanismus ist unempfindlich gegenüber Fertigungs- und Einbautoleranzen, da das System nicht auf das Erreichen eines vorbestimmten Hubweges der Kolben 43 der Klemmzylinder 42 ausgerichtet ist, sondern auf das Erreichen eines maximalen Klemmdrucks, welcher mit Hilfe des Entlastungsventils 50 leicht hergestellt werden kann. Schließlich zeichnet sich das hier beschriebene hydraulische Klemmsystem gegenüber bisher üblichen rein mechanischen Lösungen durch einen geringen Bauraum aus. Das Hydrauliköl kann mit der Leitung 42 über beliebige Wege geleitet werden, so dass die Leitungen 40, anders als beispielsweise eine üblicherweise verwendete mechanische Welle, weiteren Komponenten nicht im Wege sind. Insbesondere bleibt der Bauraum zwischen den beiden Klemmzylindern 52 frei.In the illustrated embodiment of the column foot 10, a high clamping effect can be generated with low operating forces. The clamping mechanism is insensitive to manufacturing and installation tolerances, since the system is not aimed at achieving a predetermined stroke of the piston 43 of the clamping cylinder 42, but to achieve a maximum clamping pressure, which can be easily prepared by means of the relief valve 50. Finally, the hydraulic clamping system described here is distinguished from previously customary purely mechanical solutions by a small space. The hydraulic oil can be passed with the line 42 through any paths, so that the lines 40, unlike, for example, a commonly used mechanical shaft, other components are not in the way. In particular, the space between the two clamping cylinders 52 remains free.

Obgleich in den Zeichnungen und in der vorhergehenden Beschreibung ein bevorzugtes Ausführungsbeispiel aufgezeigt und detailliert beschrieben ist, soll dies als rein beispielhaft und die Erfindung nicht einschränkend angesehen werden. Es wird darauf hingewiesen, dass nur das bevorzugte Ausführungsbeispiel dargestellt und beschrieben ist und sämtliche Veränderungen und Modifizierungen, die derzeit und künftig im Schutzumfang der Erfindung liegen, geschützt werden sollen.Although a preferred embodiment has been shown and described in detail in the drawings and foregoing description, this is to be considered as illustrative and not restrictive of the invention. It should be understood that only the preferred embodiment is shown and described and all changes and modifications that are presently and in the future within the scope of the invention should be protected.

Claims (5)

Operationstisch, umfassend eine Tischsäule mit einem Säulenfuß (10) und einem Säulenkopf sowie eine mit dem Säulenkopf verbindbare oder verbundene Lagerfläche, dadurch gekennzeichnet, dass der Säulenfuß (10) eine fußbodenseitige Bodenplatte (12) und eine säulenseitige Fußplatte (14) hat, dass die Fußplatte (14) auf der Bodenplatte (12) drehbar gelagert und mit einem vertikalen Spiel gegen ein Abheben von der Bodenplatte (12) durch ein Widerlager (24) gesichert ist und dass mindestens ein druckbetätigter Klemmzylinder (42) vorgesehen ist, um die Fußplatte (14) gegen das Widerlager (24) zu spannen.An operating table comprising a pedestal column having a pedestal (10) and a column head and a bearing surface connectable or connected to the column head, characterized in that the pedestal (10) has a floor-side floor panel (12) and a column-side foot panel (14) Foot plate (14) is rotatably mounted on the bottom plate (12) and secured with a vertical clearance against lifting from the bottom plate (12) by an abutment (24) and that at least one pressure-operated clamping cylinder (42) is provided to the foot plate ( 14) to tension against the abutment (24). Operationstisch nach Anspruch 1, dadurch gekennzeichnet, dass der Klemmzylinder (42) an der Fußplatte (14) angeordnet ist und sich bei Beaufschlagung durch das Druckmittel an der Bodenplatte (12) abstützt.Operating table according to Claim 1, characterized in that the clamping cylinder (42) is arranged on the base plate (14) and is supported on the base plate (12) when acted upon by the pressure medium. Operationstisch nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Widerlager von einem mit der Bodenplatte verbundenen Kreisring (22) gebildet ist, der die Fußplatte (14) umgibt und diese an ihrem äußeren Rand (26) mindestens teilweise übergreift.An operating table according to claim 1 or 2, characterized in that the abutment is formed by a circular plate (22) connected to the base plate, which surrounds the foot plate (14) and at least partially overlaps it at its outer edge (26). Operationstisch nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der mindestens eine Klemmzylinder (42) über eine fußbetätigte Pumpe (28) mit Druckfluid beaufschlagbar ist.Operating table according to one of claims 1 to 3, characterized in that the at least one clamping cylinder (42) via a foot-operated pump (28) can be acted upon with pressurized fluid. Operationstisch nach Anspruch 4, dadurch gekennzeichnet, dass die Leitung (40) zwischen der Pumpe (28) und dem Klemmzylinder (42) über ein Druckbegrenzungsventil (54) mit einem Tank (44) für das Druckfluid verbunden ist.Operating table according to claim 4, characterized in that the line (40) between the pump (28) and the clamping cylinder (42) via a pressure relief valve (54) is connected to a tank (44) for the pressurized fluid.
EP06123444A 2005-11-10 2006-11-03 Hydraulic column brake Active EP1785118B1 (en)

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ES2390127T3 (en) 2012-11-06
BRPI0604781B1 (en) 2018-05-29
CN101015492A (en) 2007-08-15
KR101227323B1 (en) 2013-01-28
CN101015492B (en) 2010-09-08
JP4916842B2 (en) 2012-04-18
EP1785118A3 (en) 2008-10-01
US20070101497A1 (en) 2007-05-10
EP1785118B1 (en) 2012-08-22
US7865985B2 (en) 2011-01-11
BRPI0604781A (en) 2007-08-28
RU2338501C2 (en) 2008-11-20
RU2006139739A (en) 2008-05-20
JP2007130477A (en) 2007-05-31
DE102005053753A1 (en) 2007-05-16
KR20070050388A (en) 2007-05-15

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