CN115590708B

CN115590708B - Patient support table

Info

Publication number: CN115590708B
Application number: CN202210793864.8A
Authority: CN
Inventors: 贝特霍尔德·鲍曼; 约翰尼斯·斯托克
Original assignee: Siemens Healthineers AG
Current assignee: Siemens Healthineers AG
Priority date: 2021-07-07
Filing date: 2022-07-07
Publication date: 2024-04-05
Anticipated expiration: 2042-07-07
Also published as: CN115590708A; DE102021207141B3

Abstract

The utility model relates to a patient support table comprising two scissor arms (3), each having a first and a second scissor arm (4, 5), which are connected to one another in an X-shaped arrangement pivotably about a common pivot axis (6) and are pivotable relative to one another by means of a lifting device (20) for vertically displacing a support table (13) connected to the scissor arms, the lifting device comprising at least one rollable and unrollable traction mechanism (23), the lower ends of the two scissor arms (4, 5) of each scissor arm being arranged at a support carrier (2), the traction mechanism being fixed by means of one end (25) at a winding shaft (21) which is rotatably arranged at the support carrier by means of a drive motor (22) and being fixed by means of the other end (26) at a connecting shaft (27) which connects the two scissor arms, the traction mechanism being guided by means of a plurality of pulley blocks (28, 29) which are arranged at the connecting shaft and the winding shaft.

Description

Patient support table

Technical Field

The utility model relates to a patient support table comprising two scissor carriages with a first and a second scissor arm, respectively, which are pivotably connected to each other in an X arrangement about a common pivot axis and are pivotable relative to each other by means of a lifting device for vertically moving the support table connected to the scissor carriages, wherein the lifting device comprises at least one rollable and unrollable traction mechanism, wherein the lower ends of the two scissor arms of each scissor carriage are arranged at a carriage carrier.

Background

Such patient support tables are used in different applications in medical technology. Which is used for examination and therapeutic purposes. The patient can be accommodated on a table, wherein the table can be varied in its height such that it can be adjusted between a lowered position allowing easy boarding and a raised examination or treatment position. For this purpose, a lifting device is used, via which two scissor supports can be adjusted, on which the table is ultimately supported. The two scissor supports each have two scissor arms which are pivotably connected to one another in an X-shaped arrangement and which are folded almost for lowering, i.e. the X-arrangement is relatively flat, and are pulled apart from one another for lifting, i.e. the X-arrangement is set up.

Such a patient support table has two parallel-arranged scissor supports, which each have two scissor arms, wherein the scissor supports move synchronously with each other. The scissor bracket is fixed, for example, by its lower end to a carrier plate or carrier, wherein, for example, a respective arm end is fixed in position in a fixed bearing, but is mounted in a pivotable manner, while the other end is guided in a linearly movable manner via a floating bearing, wherein the arm end is also mounted in a pivotable manner. The upper arm end is connected, for example, with a table holder at which the table plate can be releasably placed, wherein one end at a time is fixed in position and pivotable in a fixed bearing and the other end is guided linearly and pivotable via a floating bearing.

Different lifting devices are known for height adjustment. Screw drives are generally used, for example in the form of ball screws or trapezoidal screws, wherein the respective screw and the nut running thereon are moved relative to one another and one or more elements to be lifted or lowered are coupled, for example, by means of a screw nut which is moved along a stationary screw. On the one hand, such screw drives are relatively maintenance-intensive, in particular with respect to the supply of lubricant, and furthermore generate noise during operation, in particular in the case of high loads which are to be lifted. The background noise also changes during lifting due to the lever ratio between the lower and upper lifting positions. Furthermore, the operating time is limited due to the inherent friction generated within the spindle drive.

Alternatively, lifting devices with a traction mechanism drive are known for this purpose. The lifting of the scissor bracket is achieved here via a traction mechanism, for example a belt, which can be wound onto and unwound from a winding shaft. For this purpose, the traction means is fixed by means of the other end to one of the scissor supports. The traction mechanism thus extends from the winding shaft to the scissor bracket. In order to obtain a true lifting movement, the traction mechanism is coupled to or wound around a roller device, which is arranged between two V-shaped open arm sections of the scissor bracket. The function is here that when the traction mechanism is rolled up, the roller means continue to be pressed between the arm sections to such an extent that they are pressed away from each other for lifting. When the traction mechanism is extended, the roller device is unloaded again, so that the scissor bracket is folded together again due to the weight and the roller device is moved back again. An example of such traction mechanism drives is described in publication "To design a belt drive scissor lifting table", corrado Andrea et al, international Journal of Engineering and Technology (IJET), vol.8, no.1, 2016, 2-3, pages 515-525. There, the belt extends from the winding shaft on the floor side, i.e. at the support carrier, via the roller means to the fastening means provided at the sides of the scissor arms, where the belt ends are fastened. As the fixation on the arm side, a multi-part, thus complex, holder is provided which extends laterally along the arm at the arm, at which the belt end is fixed.

German patent DE 203 02,373u 1 describes a scissor lift having an upper and a lower frame, which can be raised and lowered by a scissor pair arranged between the two frames, which scissor pair comprises scissor elements intersecting each other in a pivot axis, which scissor elements are pivotably connected at one end to the upper or lower frame in fixed bearings and are movably supported at the other end on the upper or lower frame in floating bearings, respectively, and a drive comprising a traction mechanism for erecting and lowering the scissor pair.

Disclosure of Invention

The utility model is based on the problem of providing a patient support table which is designed in a simplified manner with respect to this.

In order to solve the problem, according to the utility model, in the patient support table or support table mentioned at the beginning, the traction means is fastened by one end to a winding shaft which is rotatably mounted on the support carrier via a drive motor and is mounted in a fixed manner, and by the other end to a connecting shaft which connects the two scissor supports, wherein the traction means is guided via a plurality of pulley blocks which are provided on the connecting shaft and the winding shaft.

According to the utility model, unlike in the case of the previously known lifting devices of the patient support table, which comprise a traction mechanism, the pulley-type traction mechanism is guided between its two ends which are fastened to different structural elements. By means of one end, the traction means is fixed at a winding shaft, from which it can be wound and unwound. The other end is fixed at a connecting shaft which connects the two scissor brackets. The connecting shaft connects the two scissor arms of the two scissor supports, i.e. extends horizontally. The scissor carriages are each arranged movably, i.e. in a linear guide, by means of at least one end, on the carriage, i.e. the two scissor arms can change their relative position with respect to the carriage both rotationally and translationally, which enables folding together and lifting. The connecting shaft is arranged at the two scissor arms or the scissor arm sections extending towards the ends of the translational support. The second traction means end is fixed at the connecting shaft as described. According to the utility model, the pulley-type traction means circulates several times between the winding shaft and the connecting shaft, i.e. it extends from the winding shaft to the connecting shaft, winds around the connecting shaft and back to the winding shaft and winds around the winding shaft, and extends from the winding shaft to the connecting shaft again, in the simplest case it can then be fastened there. However, the traction mechanism can also be guided between the connecting shaft and the winding shaft again or more times, so that a plurality of corresponding loops are produced, the pulley blocks thus becoming increasingly "long". The traction mechanism is guided on the corresponding pulleys by means of its individual return or loop wire at the winding shaft and at the connecting shaft. Since if the traction means is wound onto or unwound from the winding shaft by rotation of the winding shaft caused by the drive motor, the total length of the traction means between the winding shaft and the connecting shaft changes, i.e. a relative movement of the traction means with respect to the winding shaft and the connecting shaft is induced in the winding region, which is caused by the displacement of the position of the movable connecting shaft with respect to the fixed-position winding shaft as described. The described change in the length of the traction means and the relative movement of the traction means resulting therefrom relative to the winding shaft and relative to the connecting shaft are now guided according to the utility model via the pulleys without friction, i.e. no friction processes occur between the traction means and the winding shaft and the connecting shaft during winding up and unwinding.

By guiding the traction means as a pulley block, the particular advantage arises that significantly less force is required, in particular for lifting the patient support table in which the patient is usually located, i.e. the drive motor, for example a torque motor, has to generate less torque or apply less torque to the winding shaft in order to wind up the traction means, which, for example, also has to support less torque during lowering. The more frequently the traction mechanism circulates in the pulley block, i.e. the more traction mechanism sections are produced, the less force is required for lifting or lowering the weight to be lifted or lowered is distributed over the traction mechanism sections, wherein the rope length that is required for lifting or lowering the weight to be wound up or unwound is correspondingly increased with the number of circulations for the same distance. Since it is thus possible to work with less effort, i.e. less torque must be provided in the drive motor, the drive motor can be designed smaller or simpler. The winding speed of the shaft is, although slightly higher than in a traction mechanism design without pulley blocks, always in the range of a few turns per minute, so that a corresponding rotational speed of the winding shaft can be easily provided via a simple drive motor.

The patient support table according to the utility model thus allows for an improved lifting operation in a simple design, which can be realized with significantly less drive power. Furthermore, a rapid lifting process is possible without limitation by the traction mechanism, i.e. lifting and lowering can be carried out with sufficiently high speeds, wherein the lifting and lowering speeds are dependent on the rotational speed of the winding shaft and can furthermore be set or adjusted without problems. Very precise height positioning is also possible by controlling the drive motor correspondingly in a sensor-supported manner. For example, a rotational speed sensor is provided at the motor, so that rotational speed control of the drive motor ultimately takes place, but a position or angle sensor can also be provided as a control basis, which detects the position of the scissor arms relative to one another or the angle of the scissor arms relative to one another.

Another significant advantage is the high operational smoothness and almost noiseless operation of the traction mechanism drive. During lifting and lowering, only the winding shaft rotates, and the pulley also rotates, wherein the rotation can take place almost completely noiseless by the winding shaft and the pulley via corresponding rolling bearings and, if appropriate, corresponding support of the sliding bearings at the winding shaft and the connecting shaft. Furthermore, the support is also extremely durable. Since the respective rollers are subjected to only a relatively small angle of rotation and their rotational speed is extremely low, the respective rolling or sliding bearings can also be designed relatively simply.

The traction means may itself be a rope, for example a steel rope or a rope made of plastic fibres, for example aramid fibres. But narrow belts are also contemplated.

In a development of the utility model, it can be provided that a respective lower end of the scissor arm of the scissor bracket is mounted on the bracket carrier in a linearly movable and pivotable manner via a linear guide, while the other lower end is mounted on the bracket carrier in a fixed and pivotable manner, wherein the connecting shaft is arranged in the region of the end mounted via the linear guide. The two scissor supports are thus supported by the end of one scissor arm in a fixed bearing at the support carrier, i.e. cannot move in translation, but are merely pivotally supported, in order to enable the scissor supports to be folded together and set up. While the lower end of the other scissor arm is supported in a floating bearing, i.e. translatable, so that the end of the floating support can move towards and away from the end of the fixed support. A pivot bearing is also provided here in order to enable folding together and erection. The connecting shaft connecting the two scissor brackets is now arranged in the region of the end supported via the linear guide, and is therefore likewise located in the vicinity of the bracket carrier. The winding shaft is also supported on the support carrier, i.e. in a position likewise close to the support carrier. This ultimately results in the traction means also correspondingly extending close to the bracket carrier, i.e. thus close to the ground, which in turn results in the remaining installation space between the scissor brackets being freed up and available for the integration of other required components. The arrangement of the connecting shaft in the region of the end of the floating support is also advantageous in terms of force, since a longer lever is thereby obtained at the two scissor arms from the junction of the connecting shaft to the pivot axis via which the two scissor arms are pivotably connected to one another approximately in the middle of the length of the scissor arms. The longer the lever, the less force should be applied for lifting as a whole.

The connecting shaft preferably extends in a common pivot axis of the lower ends of the two scissor arms, which are supported via the linear guide. That is, the connecting shaft is directly provided at the floating bearing of the scissor arm. The connecting shaft is a rigid shaft, and the rigid shaft does not rotate in operation. The design can be such that the connecting shaft is fixedly arranged on two floating bearings, in which the scissor arms are rotatably mounted via corresponding rolling bearings and a common pivot axis, in which the connecting shaft extends. It is also conceivable that the connecting shaft itself serves as a carrier for the rolling bearing, which is integrated into the floating bearing and on which the scissor arm is mounted. Different variants of the arrangement of the connecting shaft are thus conceivable here.

As an alternative, the connecting shaft can be arranged in a common pivot axis extending at the floating bearing, and the winding shaft can also extend in a common pivot axis of the lower end of the scissor arm, which is arranged fixedly. That is to say, the winding shafts are also arranged in a common pivot axis formed at the fixed bearing, but are of course independently supported in rotation via the corresponding rolling bearing.

If the winding shaft and the connecting shaft are arranged in a corresponding common pivot axis, they are therefore positioned very close to the bracket carrier, i.e. they can hardly be arranged deeper. This in turn causes the traction mechanism to extend very close to the carriage, i.e. close to the ground.

The centers of the connecting shaft and the winding shaft are preferably in a common horizontal plane in the installed position, which in turn then causes the traction mechanism to be guided horizontally.

As described, the pulleys are preferably supported on the connecting shaft and the winding shaft by means of rolling or sliding bearings. Via the bearing, preferably a rolling bearing, the traction mechanism can be guided almost noise-free.

As with the lower end portions, the upper end portions of the two holder arms can be supported in a fixed manner on one side and in a floating manner on the other side in the same manner. The upper ends of the two carrier arms are preferably connected to a carriage for the support table, wherein one upper end of each scissor carrier is mounted on the carriage via a floating bearing in a linearly movable and pivotable manner on the linear guide, while the other upper end is mounted on the carriage via a fixed bearing in a fixed and pivotable manner. In this case, according to the utility model, at least one support means is provided, which connects the two scissor arms of the at least one scissor carrier and supports the lifting movement in at least one direction. The scissor support is connected to a gantry which forms an interface for a support table which is releasably fastened thereto, so that a change of the support table to another support table which is specific to the planned application or a transfer of the patient together with the support table can also be effected. The two fixed bearings of the scissor bracket are of course vertically stacked on top of each other, as are the two floating bearings. A single-sided translational scissor-type gantry movement thus occurs in the region of the gantry carrier and the gantry.

In this case, it has proven to be advantageous if, for the additional support of the lifting movement in at least one direction, a support means is provided which connects the two scissor arms of the at least one scissor bracket, wherein the support means are expediently arranged in the region of the upper scissor end when the traction means have been extended in the region of the lower scissor end. The support mechanism can further optimize the lifting operation. Such a support means can be, for example, a telescopic cylinder with integrated springs, which is operated hydraulically or by means of gas. In addition to being arranged in the region of the upper end of the scissor bracket, it is of course also conceivable for the support means, i.e. for example a telescopic cylinder, to be arranged in the region of the lower end. This is particularly possible if the traction means is not guided over the entire width between the two scissor supports, but only, for example, over half, in the pulley block, so that sufficient space is still provided on the underside for setting the support means or the telescopic cylinder.

Particularly preferably, the support means is configured or arranged such that it supports a lifting movement for lowering the lifted scissor bracket. It is sometimes desirable to lower the table without the patient lying on the table top. That is, the weight to be reduced is not so high. In order to avoid slipping during the traction means guidance due to a possible reduced traction means tension, sufficient traction means tension is maintained via the support means, i.e. for example a telescopic cylinder, so that an optimized traction means operation is performed even in the event of a reduced load. Thus, if a telescopic cylinder is used, the telescopic cylinder continuously presses the two connected scissor ends apart from each other. When the table is lifted, the telescopic cylinders are pushed together, i.e. a restoring force is built up, which causes the cylinders to expand again later on when lowered, by means of which the traction means tension can be maintained.

It is sufficient if only one scissor bracket is provided with such a support mechanism with a telescopic cylinder, which as described can connect two upper ends or two lower ends. Since the two scissor brackets are supported via fixed and floating bearings, the provision of only one support mechanism at only one scissor bracket is not problematic. Alternatively, it is of course also possible to provide a corresponding support mechanism or telescopic cylinder at each scissor bracket.

The support means is also expediently arranged pivotably at the two scissor arms of the scissor support, since of course a relative pivoting movement of the scissor arms relative to the change in position can likewise be performed. The support means, i.e. the telescopic cylinder, is preferably also supported in the respective pivot axis of the upper or lower end of the scissor arm.

The support means is preferably a telescopic cylinder with integrated springs as described hereinabove. In this case, a very simple telescopic cylinder is not controllable, since it should ultimately only be configured as a telescopic cylinder providing an adjusting force in one direction, if it should only support a lowering movement, for example.

Drawings

Further advantages and details of the utility model emerge from the embodiments described hereinafter and from the figures. Here, it is shown that:

fig. 1 shows a schematic diagram of a patient support table according to the utility model in a side view, and

fig. 2 shows a cross-section along line II-II in fig. 1.

Detailed Description

Fig. 1 shows a schematic diagram of a patient support table 1 according to the utility model, comprising a stent carrier 2, at which two parallel scissor stents 3 are arranged, see also fig. 2 for this purpose. Each scissor bracket 3 is formed by a first scissor arm 4 and a second scissor arm 5, which are pivotably connected to each other in an X-shaped arrangement about a common pivot axis 6. The two scissor mounts 3 are each pivotable via a fixed bearing 7 about a first pivot axis 8 shown in fig. 2, wherein the two pivot axes 8 form a common pivot axis. The fixed bearing 7 is provided at the lower end of the first scissor arm 4.

The lower end of the further second scissor arm 5 is linearly movable via a floating bearing 9 on the linear guide 10 of the carrier 2, i.e. a translational movement is possible, as indicated by the double arrow P1, in the region of which the floating bearing 9 can be moved closer to the fixed bearing 7 or further therefrom. At the same time, each lower end of the scissor arms 5 is also pivotally supported about a pivot axis 11, which in turn forms a common pivot axis. Then, when the floating bearing is removed from the fixed bearing, the scissor bracket 3 is also lowered or moved together with the movement of the floating bearing, or when the floating bearing 9 is moved in the direction of the fixed bearing 7, the scissor bracket is set up and thus lifted.

A table 12 is connected to the upper ends of the scissor arms 4, 5, on which table a table 13 is preferably releasably arranged, which is shown only schematically in the example shown, on which table the patient 14 can lie. The upper ends of the scissor arms 4, 5 are also supported in a similar manner. The upper end of the scissor arm 5 is supported at the gantry 12 about a pivot axis 16 in a fixed bearing 15. The upper end of the scissor arm 4 is mounted in translation on a linear guide 18 of the gantry 12 via a corresponding floating bearing 17, as indicated by the double arrow P2. A pivot bearing about a pivot axis 19 is additionally provided.

For lifting and lowering the table 13, a lifting device 20 is provided, which comprises a winding shaft 21, which extends in the common pivot axis 8 of the two lower fixed bearings 7, as shown in fig. 1 and 2. The winding shafts 21 are rotatably mounted via individual rolling bearings and can be driven in rotation via drive motors 22, which are each only shown in principle. The drive motor 22 can be, for example, a torque motor, which is indicated on the basis of a sensor.

A traction means 23 in the form of a rope 24 is fixed at the winding shaft 21 by means of one end 25. The other end of the rope 24 is fixed at the connecting shaft 27. The connecting shaft 27 connects the two scissor carriages 3 between the two floating bearings 9, wherein the connecting shaft is likewise arranged in the common pivot axis 11, similar to the winding shaft 21. The connecting shaft 27 can be a rigid shaft which is thus not itself rotated, that is to say, does not require a separate support. The winding shaft 21 is rotatably mounted in relation to this via suitable rolling bearings as described above, and the scissor arms 4, 5 are likewise of course pivotally mounted in the fixed and floating bearings 7, 9 or 15, 17 via corresponding rolling bearings.

As shown in the drawings, the pulley-type rope 24 is wound around the winding shaft 21 and the connecting shaft 27 multiple times. For this purpose, a plurality of individual pulleys 28 are provided on the winding shaft 21 and a plurality of individual pulleys 29 are provided on the connecting shaft 27, which pulleys are each supported for rotation on the winding shaft 21 or the connecting shaft 27 via rolling bearings 30, 31. The rope 24 is guided via pulleys 28, 29, which is wound around pulleys 28, 29, so that a pulley-block-like arrangement is obtained as a whole. The stretching of the belt 24 is shown schematically in this side view, since the belt 24 is actually stretched between the two scissor supports 3 and is thus not visible in the side view. The belt can extend adjacent to one of the scissor supports 3 or else can extend centrally between the scissor supports 3.

The centers of the winding shaft 21 and the connecting shaft 27 preferably lie in a common horizontal plane, so that the rope 24 also extends horizontally, as shown in particular in fig. 1.

If the winding shaft is rotated, for example, clockwise during operation via the drive motor 22, so that the rope 24 is wound up, the rope length between the winding shaft 21 and the connecting shaft 27 is forcibly shortened as the winding length increases, so that the connecting shaft 27 is moved in the direction of the winding shaft 21, i.e. the floating bearing 9 is moved in the direction of the fixed bearing 7. This causes the scissor bracket 3 to set up and thereby lift the platen 13. If, conversely, the reeled-up rope 24 is unwound by the counterclockwise rotation of the winding shaft 21, the rope 24 is again lengthened and the respective rope length between the winding shaft 21 and the connecting shaft 27 is lengthened, so that the connecting shaft 27 is again remote from the winding shaft 21, which is caused by the load resting on the scissor bracket 3, which load is composed of at least the gantry 12 and the table 13, but if necessary also of the weight of the patient 14.

By means of the integrated pulley blocks, i.e. by correspondingly guiding the ropes 24 in pulley blocks, the force which should be applied in particular for the lifting decreases continuously as the number of individual integrated roller turns increases. It follows that the torque to be applied to the drive motor 22 also becomes smaller and smaller, or the required drive power is continuously reduced, so that a relatively simpler or less powerful drive motor 22 can be used.

The drawing is only a schematic diagram, that is, the number of rope turns may also be chosen differently. It is conceivable that only one pulley 28, 29 should be provided at the connecting shaft 27 and the winding shaft 21, respectively, which results in a smaller reduction of the required force or driving power, or that there are also more pulleys 28, 29, which results in a further reduction. As the number of sheaves and thus rope turns increases, the length of rope that should be reeled up or unwound also increases in order to achieve a similar lifting as a device with a smaller number of sheaves.

Since on the one hand a traction mechanism is used for the transmission and on the other hand the pulleys 28, 29 are guided in rolling manner via the rolling bearings 30, 31, a very gentle but at the same time also fast and in particular almost noiseless lifting operation is possible, since almost no friction is present and even the integrated, rotating component is a rolling bearing to which the winding shaft 21 also belongs.

As shown in fig. 1, a support mechanism 32 is provided which supports a lifting movement indicated generally by arrow P3, which is shown here in the form of a telescopic cylinder 33. The telescopic cylinder 33 comprises a cylinder 34 and a spring 35 integrated therein, and a rod 36 removable from the cylinder 34. The telescopic cylinder 34 is arranged pivotably by means of one end in the region of the fixed bearing 15 and there about the common pivot axis 16. The other end of the telescopic cylinder 33, here the rod 36, is arranged at the floating bearing 17 and there in the common pivot axis 19. That is, the scissor arms 4, 5 are also pivotable relative to the telescopic cylinder 33.

The function of the telescopic cylinder 33 is such that the spring 35 continuously pushes the rod 36 out of the cylinder 34, i.e. the upper ends of the scissor arms 4, 5 are continuously pressed apart from each other. When set up, i.e. when the upper ends of the scissor arms 4, 5 are moved towards each other, the rod 36 moves into the cylinder 34, wherein the springs 35 are pressed together. If the table 13 is now to be lowered, the spring 15 presses the rod 36 out of the cylinder 34, i.e. the telescopic cylinder 33 lengthens and in this case actively presses the scissor arms 4, 5 away from one another. If no patient is now lying on the support table 13, for example, the weight resting on the scissor support 3 is not too high, which corresponds only to the sum of the weights of the table 12 and the table 13. If the winding shaft 21 now winds up the rope 24, a reduction in the rope tension can be caused by a small weight, which can lead to slipping if the rope tension is too small. After the telescopic cylinder 33 actively presses the scissor arms 4, 5 away from each other and thus also the lower ends of the guide ropes 24 there, this is avoided via the support mechanism 32, so that the rope tension is maintained.

In the exemplary embodiment, only one support 32 is provided at the scissor bracket 3. This is sufficient after the scissor mounts are supported very stably via the fixed and floating bearings 7, 15 or 9, 17 and furthermore the two scissor mounts 3 are arranged on the common mount carrier 2 and are connected to one another on the upper side via the stand 12. That is, no tilting or torsion moment is induced which in any way has a negative effect. However, it is also appropriate in individual cases to provide the two scissor supports 3 with a telescopic cylinder 33, respectively.

Finally, such a telescopic cylinder 33 can however also be arranged close to the ground, i.e. adjacent to the bracket carrier 2. As shown in fig. 2, the rope 24 can initially run in the region of the scissor supports 3, i.e. it is not guided over the entire width between two scissor supports 3. In this case, as shown in fig. 2, there is now sufficient space for the telescopic cylinder 33 to be provided in the region of the lower end of the scissor bracket 3 shown on the right in fig. 2.

While the details of the utility model have been illustrated and described in detail by the preferred embodiments, the present application is not limited by the examples disclosed and other variations can be derived therefrom by those skilled in the art without departing from the scope of the utility model.

Claims

1. Patient support table (1) comprising two scissor carriages (3) each having a first and a second scissor arm (4, 5) which are pivotably connected to one another in an X-shaped arrangement about a common pivot axis (6) and are pivotable relative to one another by means of a lifting device (20) for vertically displacing a support table (13) connected to the scissor carriages (3), wherein the lifting device (20) comprises at least one rollable and unrollable traction mechanism (23), wherein the lower ends of the two scissor arms (4, 5) of each scissor carriage (3) are arranged at a carriage carrier (2), wherein the traction mechanism (23) is fixed by means of one end (25) at a connecting shaft (27) which connects the two scissor carriages (3) via a drive motor (22) and is fixed by means of the other end (26) at a winding shaft (21) which connects the two scissor carriages (3), wherein the pulley blocks (27) are arranged at the winding pulley blocks (28) via the winding shafts (21),

characterized in that at least one support means (32) is provided for supporting the two scissor arms (4, 5) of the at least one scissor support (3), said support means supporting a lifting movement in at least one direction, wherein the tension of the traction means (23) can be maintained via the support means (32) when the support table (13) is lowered in the event of a load decrease.

2. The patient support table according to claim 1, wherein,

the respective lower ends of the scissor arms (4, 5) of the scissor bracket (3) are mounted on the bracket carrier (2) in a linearly movable and pivotable manner via a linear guide (10), while the other lower end is mounted on the bracket carrier (2) in a fixed and pivotable manner, wherein the connecting shaft (27) is arranged in the region of the end mounted via the linear guide (10).

3. The patient support table according to claim 2, wherein,

the connecting shaft (27) extends in a common pivot axis (11) of the lower ends of the two scissor arms (4, 5) that are supported via the linear guide (10).

4. The patient support table according to any one of the preceding claims, wherein,

the winding shafts (21) extend in a common pivot axis (8) of the fixedly arranged lower ends.

5. The patient support table according to claim 4, wherein,

the centers of the connecting shaft (27) and the winding shaft (21) are in a common horizontal plane in the installed position.

6. The patient support table according to any one of claims 1 to 3,

the pulleys (28, 29) are supported on the connecting shaft (27) and the winding shaft (21) by means of rolling or sliding bearings (30, 31).

7. The patient support table according to any one of claims 1 to 3,

the traction mechanism (23) is a rope (24) or a belt.

8. The patient support table according to any one of claims 1 to 3,

the upper ends of the two support arms (4, 5) are connected to a stand (12) for a support table (13), wherein one upper end of each scissor bracket (3) is mounted on the stand (12) in a linearly movable and pivotable manner via a linear guide (18), and the other upper end is mounted on the stand (12) in a fixed and pivotable manner.

9. The patient support table according to any one of claims 1 to 3,

the support means (32) is designed or arranged such that it supports a lifting movement for lowering the lifted scissor bracket (3).

10. The patient support table according to any one of claims 1 to 3,

each scissor bracket (3) is provided with a supporting mechanism (32).

11. The patient support table according to any one of claims 1 to 3,

the support means (32) connects the two scissor arms (4, 5) of the scissor support (3) in the region of the upper ends of the scissor arms (4, 5).

12. The patient support table according to any one of claims 1 to 3,

the support means (32) is pivotally mounted at the two scissor arms (4, 5) of the scissor support (3) in respective pivot axes (16, 19) of the upper or lower ends of the scissor arms (4, 5).

13. The patient support table according to any one of claims 1 to 3,

the support means (32) is a telescopic cylinder (33) with an integrated spring (35).