DE102012005760A1 - Patient bed e.g. hospital bed, has adjusting unit that adjusts effective lengths of lifting columns, so that length of one column is determined from lengths of other three columns and all columns are always torsion-free with bed frame - Google Patents

Abstract

The bed has four vertically extending lifting columns (7a-7d) supported on a base (1) at respective upper attachment points (9a-9d). Six connecting lines of the columns, in which two lying parallel to horizontal longitudinal axis and two lying parallel to horizontal transverse axis, are formed. An adjusting unit adjusts the effective lengths (la-ld) of the columns that are coupled to one another, so that effective length of one lifting column is determined from effective lengths of other three lifting columns and all the lifting columns are always torsion-free with a bed frame (4).

Description

• – wobei die Patientenliege ein Untergestell aufweist, mittels dessen die Patientenliege auf dem Fußboden aufsteht,
• – wobei die Patientenliege einen Liegerahmen aufweist, der eine Liegefläche für eine Person trägt,
• – wobei die Patientenliege vier vertikal verlaufende Hubsäulen aufweist, mittels derer der Liegerahmen relativ zum Untergestell verstellbar ist,
• – wobei wirksame Längen der vier Hubsäulen mittels einer Einstelleinrichtung einstellbar sind.

The present invention relates to a patient couch,

• - wherein the patient bed has a base, by means of which the patient bed stands up on the floor,
• The patient bed having a lying frame which supports a lying surface for a person,
• - wherein the patient bed has four vertically extending lifting columns, by means of which the lying frame is adjustable relative to the base frame,
• - Where effective lengths of the four lifting columns are adjustable by means of an adjustment.

Such patient beds are well known. Purely by way of example is on the DE 43 41 779 C2 directed.

In the DE 43 41 779 C2 the lifting columns are designed as hydraulic cylinders. One of the hydraulic cylinders is attached to the underframe and acts on a support plate. This hydraulic cylinder serves to raise and lower the carrier plate. The three other hydraulic cylinders are fixed to the support plate and act on the reclining frame. These three hydraulic cylinders serve to pivot the reclining frame about two orthogonal horizontal pivot axes.

The object of the present invention is to provide a patient bed of the type mentioned, which is structurally simple and whose reclining frame is flexibly adjustable in a simple manner.

The object is achieved by a patient bed with the features of claim 1. Preferred embodiments of the patient bed according to the invention can be found in the dependent claims 2 to 10.

• – dass die vier Hubsäulen sich an einem jeweiligen unteren Befestigungspunkt am Untergestell abstützen und an einem jeweiligen oberen Befestigungspunkt auf den Liegerahmen wirken,
• – dass die vier Hubsäulen in einer horizontal verlaufenden Ebene gesehen ein Rechteck bilden,
• – dass in der horizontal verlaufenden Ebene gesehen von den sechs Verbindungslinien der Hubsäulen miteinander zwei parallel zu einer horizontalen Liegenlängsachse und zwei parallel zu einer die Liegenlängsachse orthogonal schneidenden horizontalen Liegenquerachse verlaufen,
• – dass die Einstelleinrichtung die Einstellung der wirksamen Längen der vier Hubsäulen stets derart miteinander koppelt, dass die wirksame Länge einer der vier Hubsäulen durch die wirksamen Längen der drei anderen Hubsäulen bestimmt ist, so dass die vier Hubsäulen den Liegerahmen stets verwindungsfrei tragen.

According to the invention it is provided to design a patient couch of the type mentioned,

• - That the four lifting columns are supported at a respective lower attachment point on the base frame and act at a respective upper attachment point on the reclining frame,
• That the four lifting columns form a rectangle when viewed in a horizontally extending plane,
• That seen in the horizontally extending plane of the six connecting lines of the lifting columns with each other two parallel to a horizontal couch longitudinal axis and two parallel to the couch longitudinal axis orthogonal intersecting horizontal couch transverse axis,
• - That the adjuster always adjusts the setting of the effective lengths of the four lifting columns such that the effective length of one of the four lifting columns is determined by the effective lengths of the other three lifting columns, so that the four lifting columns always carry the lying frame torsion-free.

In principle it is possible, the effective lengths in any way - d. H. without further restrictions - to vary. However, the adjustment device preferably has a standard operating mode in which it always couples the adjustment of the effective lengths of the four lifting columns to one another in such a way that the effective lengths of the four lifting columns are at least equal in pairs. The lying frame can thus be moved vertically in the standard operating mode and be pivoted about the couch longitudinal axis or about the couch transverse axis, but not simultaneously pivoted about the couch longitudinal axis and the couch transverse axis.

• – dass im Standardbetriebsmodus ein Hubbetrieb, ein Längsschwenkbetrieb und ein Querschwenkbetrieb vorgebbar sind,
• – dass die wirksamen Längen der vier Hubsäulen im Hubbetrieb gleichartig und um gleiche Längenänderungen verändert werden, so dass der Liegerahmen im Hubbetrieb in Richtung der Lotrechten verfahren wird,
• – dass die wirksamen Längen der vier Hubsäulen im Längsschwenkbetrieb paarweise gleichartig und um gleiche Längenänderungen verändert werden, so dass der Liegerahmen im Längsschwenkbetrieb um die Liegenquerachse verschwenkt wird,
• – dass die wirksamen Längen der vier Hubsäulen im Querschwenkbetrieb paarweise gleichartig und um gleiche Längenänderungen verändert werden, so dass der Liegerahmen im Querschwenkbetrieb um die Liegenlängsachse verschwenkt wird und
• – dass der Längsschwenkbetrieb und der Querschwenkbetrieb im Standardbetriebsmodus nur vorgebbar sind, wenn die aufgrund des Längsschwenkbetriebs und des Querschwenkbetriebs paarweise gleichartig zu verändernden wirksamen Längen bereits paarweise gleich sind.

The configuration of the standard operating mode is preferably such

• That in the standard operating mode a lifting operation, a longitudinal pivoting operation and a transverse pivoting operation can be predetermined,
• - That the effective lengths of the four lifting columns are changed in lifting operation similar and by equal changes in length, so that the lying frame is moved in the lifting operation in the direction of the vertical,
• - That the effective lengths of the four lifting columns in the longitudinal pivoting operation are changed in pairs similar and equal length changes, so that the reclining frame is pivoted in the longitudinal pivoting about the couch transverse axis,
• - That the effective lengths of the four lifting columns in the transverse pivoting operation are changed in pairs similar and equal length changes, so that the lying frame is pivoted in the transverse pivoting about the couch longitudinal axis and
• - That the longitudinal pivoting operation and the transverse pivoting operation in the standard operating mode can only be specified if the due to the longitudinal pivoting operation and the transverse pivoting operation in pairs equally to be changed effective lengths are already equal in pairs.

The lifting operation is in the standard operating mode, however, usually always specified.

As a rule, the effective lengths of the lifting columns are adjusted by motor. In this case, preferably the lifting operation, the longitudinal pivoting operation and the transverse pivoting operation of the adjusting device can be predetermined by an operator by actuating a single respective command key of an operating device. The operation of the corresponding command keys is a matter of course Although possible at any time. However, pressing, for example, the button "transverse pivoting operation" does not cause transverse pivoting, as long as the bed frame is pivoted about the bed transverse axis. The two pivoting operations are therefore locked against each other in terms of control technology.

If the effective lengths of the lifting columns are adjusted by the motor, the adjusting device preferably - alternatively or in addition to the standard mode of operation - a special mode of operation in which they the setting of the effective lengths of the four lifting columns coupled together such that a solid angle, one orthogonal to the lying surface extending Vertical axis with the vertical forms, a Lissajousfigur describes.

The Lissajous figure generally has the same frequency with respect to the angles in the plane defined by the perpendicular and the longitudinal axis of the couch and with respect to the perpendicular and the lateral transverse axis. The phase shift in this case is usually 90 °. The Lissajous figure thus represents in this case an ellipse whose half-axes are parallel to the longitudinal axis of the couch and the lateral transverse axis.

In the case of the motor setting of the effective lengths of the lifting columns, the adjustment can alternatively be made electrically or hydraulically. As an alternative to a motor adjustment but also an adjustment with muscle power is possible. In this case, the effective lengths of the lifting columns are usually adjusted hydraulically.

By pivoting movements of the reclining frame, the absolute distances of the upper attachment points change from each other. To compensate for such changes in distance is preferably provided that the lying frame has a first axis which extends parallel to the lying longitudinal axis or parallel to the lying transverse axis and slidably mounted on the bed frame transverse to its extension direction, and that on the first axis depending on the upper attachment points in relation is arranged axially non-displaceable and axially displaceable on the direction of extension of the first axis.

In addition, it is preferably provided that the lying frame has a second axis which extends parallel to the first axis and the bed frame is mounted immovable transversely to its extension direction, that on the second axis, a third of the upper attachment points with respect to the extension direction of the second axis axially is slidably disposed and that a connecting line from the third of the upper attachment points to the axially displaceable on the first axis arranged upper attachment point is orthogonal to the extension direction of the first axis. The fourth upper attachment point may be disposed on the second axis. If this is the case, the fourth upper attachment point on the second axis with respect to the direction of extension thereof is arranged axially non-displaceable.

Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction with the drawings. In schematic schematic representation:

1 a patient bed from the side,

2 the patient bed of 1 from the front,

3 a view from the top along one in the 1 and 2 III-III cutting line,

4 four lifting columns and their control,

5 and 6 one possible operating device each,

7 a reclining frame from the side,

8th and 9 one axis each and

10 an arrangement of upper attachment points.

According to the 1 and 2 has a patient bed - for example, a hospital or nursing bed - a base 1 on. With the base 1 the patient bed is on the floor 2 (complete: horizontal). It is possible that the undercarriage 1 Rolling on its underside 3 having. In this case, the patient bed is designed as a mobile patient bed. However, this is of minor importance in the context of the present invention.

The patient bed also has a lying frame 4 on. The lying frame 4 carries a lying surface 5 for a person 6 , The lying frame 4 extends in the direction of a couch longitudinal axis LLA mostly over a length l of about 2 m, in the direction of a couch transverse axis LQA over a width b of about 1 m. The couch longitudinal axis LLA and the couch transverse axis LQA are horizontal and orthogonal to each other. The couch longitudinal axis LLA runs in the direction of the head-foot of the person using the patient bed 6 , the lateral transverse axis LQA from shoulder to shoulder.

According to the 1 to 3 the patient bed has four lifting columns 7a to 7d on. By means of the lifting columns 7a to 7d is the reclining frame 4 relative to the base 1 adjustable. The four lifting columns 7a to 7d are based on a respective lower attachment point 8a to 8d on the undercarriage 1 from. They act via a respective upper attachment point 9a to 9d on the reclining frame 4 ,

How out 3 it can be seen form the four lifting columns 7a to 7d in a horizontal plane seen a rectangle. The four lifting columns 7a to 7d Define in this plane six (imaginary, not physically existing) connecting lines, each from one of the four lifting columns 7a to 7d to each other one of the four lifting columns 7a to 7d extend. Two of the connecting lines run parallel to the longitudinal axis LLA. Two other of the connecting lines run parallel to the lateral transverse axis LQA. The two remaining connecting lines extend between each diagonally opposite lifting columns 7a and 7d such as 7b and 7c ,

The patient bed has according to 4 furthermore an adjustment device 10 on. By means of the adjustment 10 are effective lengths la to ld of the four lifting columns 7a to 7d adjustable. For the sake of simpler explanation, it is assumed below that the state in which all four effective lengths la to ld are equal corresponds to the state of the patient couch in which the reclining frame is 4 oriented horizontally.

The adjustment device 10 couples (= synchronizes) the setting of the effective lengths la to ld with each other. The coupling is always such that the effective length ld of one of the four lifting columns 7d through the effective lengths la to lc of the three other lifting columns 7a to 7c is determined. The adjustment device 10 determines the effective lengths la to ld of the four lifting columns 7a to 7d in this case such that the four lifting columns 7a to 7d the lying frame 4 Always wear torsion-free.

In particular, the condition is usually ld - lc = lb - la or the equivalent relationship ld - lb = lc - la Fulfills.

It is possible that the adjusting device 10 powered by muscle power. In this case, the effective lengths la to ld of the lifting columns 7a to 7d preferably hydraulically adjusted. As a rule, the effective lengths la to ld of the lifting columns 7a to 7d but adjusted by motor. In this case, the effective lengths la to ld of the lifting columns 7a to 7d alternatively be set hydraulically or electrically.

Often it makes sense not to use all possible degrees of freedom of the patient bed according to the invention. In general, it makes much sense if the adjustment 10 the setting of the effective lengths la to ld of the four lifting columns 7a to 7d always coupled together in such a way that the effective lengths la to ld of the four lifting columns 7a to 7d at least in pairs are the same. This applies at least in a standard operating mode of the adjusting device 10 , In the standard operating mode of the adjuster 10 is always valid ld - lc = lb - la = 0 or alternatively ld - lb = lc - la = 0.

It is - of course - even possible that both conditions are met, that is, so ld = lc = lb = la.

If the adjustment 10 in the standard operating mode, the effective lengths la to ld of the lifting columns 7a to 7d coupled in such a way that they are always the same in pairs, in the standard operating mode, a lifting operation, a longitudinal pivoting operation and a transverse pivoting operation can be predetermined. In lifting operation, the effective lengths la to ld of the four lifting columns 7a to 7d similar and changed by the same length changes. This will make the reclining frame 4 moved in the lifting operation in the direction of the vertical, the lying frame 4 So raised or lowered as a whole. In longitudinal pivoting operation, however, the effective lengths la to ld of the four lifting columns 7a to 7d in pairs similar and changed by the same length changes. This will make the reclining frame 4 in longitudinal pivoting mode - with or without superimposed lifting movement - pivoted about the transverse bed axis LQA. For example, in longitudinal pivoting operation, the effective lengths lc, ld of the lifting cylinders 7c . 7d be changed while the effective lengths la, lb of the lifting cylinder 7a . 7b kept constant. Of course, the reverse procedure is possible. Alternatively, it is possible to increase (decrease) the effective lengths lc, ld of the lift cylinders 7c . 7d with an opposite change in the effective lengths la, lb of the other two lifting cylinders 7a . 7b to pair.

In an analogous way, the effective lengths la to ld of the four lifting columns 7a to 7d changed in the transverse pivot operation in pairs similar to the same length changes. This will make the reclining frame 4 in transverse pivoting to the Lying longitudinal axis LLA pivoted. However, in contrast to the longitudinal pivoting operation, the effective lengths la, lc of the two lifting cylinders are in transverse pivoting operation 7a . 7c in pairs similar and changed by the same length changes, while the effective lengths lb, ld of the other two lifting cylinders 7b . 7d kept constant. Again, of course, the reverse procedure is possible. Also, it is again possible here, as an alternative to keeping the effective lengths lb, ld of the other two lifting cylinders constant 7b . 7d to make a contrary adjustment.

It is possible that the lifting operation in the standard operating mode can always be specified. In contrast, the longitudinal pivot operation and the transverse pivot operation can only be specified in the standard operating mode if the effective lengths la to ld, which are to be modified in a similar manner in pairs due to the longitudinal pivot operation or the transverse pivot operation, are already equal in pairs. In other words, when all four effective lengths la to ld are equal, alternatively, the longitudinal swing operation or the transverse swing operation may be performed. If, on the other hand, a cross-swiveling has already taken place, that is to say, that is true ld - lb = lc - la = 0, not the condition ld - lc = lb - la = 0, Although in this state, although a Querverschwenken still possible, a longitudinal pivoting is locked. Analogous embodiments apply in the reverse case, if the lying frame is thus pivoted about the transverse bed axis LQA.

It is possible that the lifting columns 7a to 7d from an operator 11 by pressing corresponding control buttons 12 an operating device 13 are individually controllable. Preferably, the lifting operation, the longitudinal pivoting operation and the transverse pivoting operation of the adjusting device 10 from the operator 11 however according to the 5 and 6 by pressing a single respective command key 12 the operating device 13 predetermined. The term "predicate" is hereby equivalent to the actual activation of the corresponding operation, so that the reclining frame 4 is actually adjusted.

In the illustration according to 5 is a command key for each of the three modes 12 for the two possible respective traversing directions available. Alternatively, it would be according to, for example 6 possible that a selector or a dial key 12 ' is available for the corresponding operating mode. In this case, for example, by sequentially pressing the corresponding dial key 12 ' be changed sequentially between the modes of lifting, longitudinal pivoting and transverse pivoting, so that only the two command buttons 12 must be present for the two possible traversing directions. Other configurations are of course possible.

In individual cases, it may still be useful to a special operating mode of the adjustment 10 provided. The special mode is only useful if the effective lengths la to ld are set by motor. In special mode, the adjuster couples 10 the setting of the effective lengths la to ld of the four lifting columns 7a to 7d in such a way that a solid angle, one orthogonal to the lying surface 5 vertical axis 14 forms with the vertical, describes a Lissajousfigur. The lying area 5 So, so to speak - like a gyro whose axis of rotation is not perpendicular - it performs a circular three-dimensional movement.

The lying frame 4 is, as is apparent from the above statements, both about the couch longitudinal axis LLA and about the couch transverse axis LQA pivotable. To the lifting columns 7a to 7d To avoid acting bending forces, has the reclining frame 4 according to the 7 and 8th therefore a first axis 15 on. The first axis 15 extends parallel to the lateral transverse axis LQA. Alternatively, it could extend parallel to the couch longitudinal axis LLA. The first axis 15 is on the reclining frame 4 transverse to its extension direction - according to 7 So essentially in the direction of the couch longitudinal axis LLA - slidably mounted. This is in 7 indicated by a double arrow C.

At the first axis 15 are two of the top attachment points 9a to 9d arranged, for example, the two upper attachment points 9a and 9b , One of these two upper attachment points 9a . 9b - according to 8th the upper attachment point 9a - is on the first axis 15 arranged axially immovable. The other upper attachment point 9b is at the first axis 15 arranged axially displaceable. This is in 8th indicated by a corresponding double arrow A.

Preferably, the reclining frame 4 continue a second axis 16 on. The second axis 16 extends parallel to the first axis 15 , The second axis 16 can on the reclining frame 4 be stored immovable transversely to their direction of extension. At the second axis 16 is according to 9 a third of the upper attachment points 9a to 9d arranged, here the upper attachment point 9d , This upper attachment point 9d is how in 9 indicated by a corresponding double arrow B, in the extension direction of the second axis 16 seen arranged axially displaceable. A (imaginary) connecting line of the two displaceably arranged upper attachment points 9b . 9d proceeds according to 10 orthogonal to the extension direction of the first axis 15 and thus at the same time orthogonal to the extension direction of the second axis 16 ,

According to 9 is on the second axis 16 also the fourth upper attachment point 9c arranged. However, this is not mandatory if the fourth upper attachment point 9c on the second axis 16 is arranged, it is with respect to the extension direction of the second axis 16 arranged axially immovable.

The present invention has many advantages. In particular, a reliable and robust hospital and nursing bed can be created in a simple manner. Furthermore, four similarly constructed lifting columns 7a to 7d can be used, which are driven in a similar manner. This simplifies both spare parts management and logistics in general. Furthermore, it facilitates the programming of the adjustment 10 ,

The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

LIST OF REFERENCE NUMBERS

1

undercarriage

2

floor

3

roll

4

bed frame

5

lying area

6

person

7a to 7d

Lifting Columns

8a to 8d

lower attachment points

9a to 9d

upper attachment points

10

adjustment

11

operator

12

command keys

12 '

Dial key

13

operating device

14

vertical axis

15

first axis

16

second axis

A, B, C

double arrows

b

width

l

length

la to ld

effective lengths

LLA

are longitudinal axis

LQA

Are transverse axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4341779 C2 [0002, 0003]

Claims (10)

Patient table, - where the patient table is a base ( 1 ), by means of which the patient bed on the floor ( 2 ), wherein the patient bed is a lying frame ( 4 ) having a lying surface ( 5 ) for a person ( 6 ), wherein the patient bed has four vertically extending lifting columns ( 7a - 7d ), by means of which the lying frame ( 4 ) relative to the underframe ( 1 ) is adjustable, - wherein the four lifting columns ( 7a - 7d ) at a respective lower attachment point ( 8a - 8d ) on the subframe and at a respective upper attachment point ( 9a - 9d ) on the reclining frame ( 4 ), the four lifting columns ( 7a - 7d ) form a rectangle seen in a horizontal plane, - seen in the horizontally extending plane of the six connecting lines of the lifting columns ( 7a - 7d ) run parallel to each other with a horizontal lying longitudinal axis (LLA) and two parallel to a horizontal lying transverse axis (LQA) orthogonal to the lying longitudinal axis (LLA), - whereby effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) by means of an adjusting device ( 10 ) are adjustable, - wherein the adjusting device ( 10 ) the setting of the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) is always coupled together in such a way that the effective length (ld) of one of the four lifting columns ( 7d ) by the effective lengths (la-lc) of the three other lifting columns ( 7a - 7c ), so that the four lifting columns ( 7a - 7d ) the lying frame ( 4 ) always warp-free. Patient couch according to claim 1, characterized in that the adjusting device ( 10 ) has a standard operating mode in which it sets the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) is always coupled together in such a way that the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) are the same in pairs at least. Patient couch according to claim 2, characterized in that - in the standard operating mode, a lifting operation, a longitudinal pivoting operation and a transverse pivoting operation can be predetermined, - that the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) in Hubbetrieb similar and changed by the same length changes, so that the lying frame ( 4 ) is moved in the vertical direction in the direction of the vertical, - that the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) in the longitudinal pivoting operation in pairs are similar and changed by the same length changes, so that the lying frame ( 4 ) is pivoted in the longitudinal pivoting about the couch transverse axis (LQA), - that the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) in the transverse pivoting operation in pairs are similar and changed by the same length changes, so that the lying frame ( 4 ) in the transverse pivoting operation about the longitudinal axis of the couch (LLA) is pivoted, - that the longitudinal pivoting and the transverse pivoting operation in the standard operating mode can only be specified if the due to the longitudinal pivoting operation and the transverse pivoting operation in pairs equally to be changed effective lengths (la-ld) are already equal in pairs. Patient bed according to claim 3, characterized in that the lifting operation in the standard operating mode is always predetermined. Patient couch according to claim 3 or 4, characterized in that the effective lengths (la-ld) of the lifting columns ( 7a - 7d ) and that the lifting operation, the longitudinal pivoting operation and the transverse pivoting operation of the adjusting device ( 10 ) by an operator ( 11 ) by pressing a single respective command key ( 12 ) an operating device ( 13 ) can be specified. Patient couch according to one of the above claims, characterized in that the effective lengths (la-ld) of the lifting columns ( 7a - 7d ) and that the adjustment device ( 10 ) has a special operating mode in which it sets the effective lengths (la-ld) of the four lifting columns ( 7a - 7d ) in such a way that a solid angle, which is orthogonal to the lying surface ( 5 ) vertical axis ( 14 ) forms with the vertical, describes a Lissajousfigur. Patient couch according to claim 5 or 6, characterized in that the effective lengths (la-ld) of the lifting columns ( 7a - 7d ) can be adjusted electrically or hydraulically. Patient couch according to claim 1, 2, 3 or 4, characterized in that the effective lengths (la-ld) of the lifting columns ( 7a - 7d ) are hydraulically adjusted. Patient couch according to one of the above claims, characterized in that the lying frame ( 4 ) a first axis ( 15 ) which extends parallel to the longitudinal axis of the couch (LLA) or parallel to the lateral transverse axis (LQA) and on the reclining frame ( 4 ) is slidably mounted transversely to its direction of extension, and that on the first axis ( 15 ) one each ( 9a . 9b ) of the upper attachment points ( 9a - 9d ) with respect to the extension direction of the first axis ( 15 ) is arranged axially immovable and axially displaceable. Patient couch according to claim 9, characterized in that the lying frame ( 4 ) a second axis ( 16 ), which are parallel to the first axis ( 15 ) and on the reclining frame ( 4 ) is mounted non-displaceably transversely to its direction of extension, that on the second axis ( 16 ) a third one ( 9d ) of the upper attachment points ( 9a - 9d ) with respect to the extension direction of the second axis ( 16 ) is arranged axially displaceable and that a connecting line from the third ( 9d ) of the upper attachment points ( 9a - 9d ) to that on the first axis ( 15 ) axially displaceably arranged upper attachment point ( 9b ) orthogonal to the extension direction of the first axis ( 15 ) runs.

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