EP3572056B1 - Stretcher support device - Google Patents

Description

The present invention relates to a stretcher mounting device for storing a patient stretcher in a vehicle and for moving the stretcher out of or into the vehicle, wherein the stretcher mounting device can be connected to the structure of the vehicle so that the stretcher mounting device is arranged within the cargo space of the vehicle .

Such stretcher storage devices are used to move a stretcher with a patient out of the plane on which the wheels of an ambulance vehicle rest into the cargo space of the vehicle, the height to be overcome can be very large if the vehicle is all-terrain and a has great ground clearance. In such cases, it is also necessary that the stretcher mounting device is driven, since a movement by hand can hardly be performed by one person alone. In addition, it is necessary that the stretcher mounting device manages the movement of the stretcher from the reception to the loading space in the shortest possible time, since there is often very little time available.

Such a stretcher storage device is for example from DE 20 2015 008 857 U1 known. This device has an underframe which can be mounted on the floor of the loading space of a vehicle and to which a lower frame and an upper frame are attached, the lower frame with the upper frame telescopically guided therein being moved beyond a loading end of the lower frame and pivoted downward can. The upper frame is then extended telescopically out of the lower frame to an end position. In this end position, a stretcher can be attached to the upper frame, and the upper frame is then pulled back into the lower frame. Then the subframe is swiveled back into the horizontal position and pulled back onto the subframe.

In such a stretcher mounting device, it is a requirement that the stretcher attached to the stretcher mounting device during the movement of the stretcher mounting device between the position in which the stretcher is mounted on the upper frame and the end position in which the stretcher is with the patient in the cargo space does not exceed an angle of 16 ° to the horizontal. This special requirement arises from the standard DIN EN 1789, which is relevant for such facilities.

Because of this requirement, the stretcher storage device according to the prior art has the problem that, due to the telescopic movement of the upper frame with respect to the lower frame, a great deal of space is required behind the vehicle during loading and unloading, especially when the vehicle has a large ground clearance and a large difference in height has to be overcome with the stretcher storage device This is disadvantageous because this space is often not available.

Therefore, based on the prior art, the object of the present invention is to provide a stretcher mounting device for moving a patient stretcher into the cargo space of a vehicle, which is used to overcome the height difference between the plane in which the stretcher is located when it is picked up by the stretcher mounting device and the level in which the stretcher is positioned in the cargo area of the vehicle, requires as little space as possible outside the vehicle.

According to the invention, this object is achieved by a stretcher storage device with an underframe which is designed to be connected to the structure of a vehicle so that the stretcher storage device is arranged in a cargo space of the vehicle, with a subframe which is arranged on the underframe and is firmly connected to it wherein the subframe has a front end and a loading end and extends between them parallel to the floor surface, with an intermediate frame having first and second ends and which is slidably attached to the subframe so that it is between a retracted position in which the intermediate frame is positioned over the sub-frame so that the first end of the intermediate frame is positioned at the front end and the second end of the intermediate frame is positioned at the loading end, and an extended position in which the intermediate frame can be moved over the loading gsende also extends, and with an upper frame which has a flat loading surface and a first and a second end and which is slidably mounted on the intermediate frame such that it is relative to the intermediate frame between a retracted position in which the upper frame so above the intermediate frame is arranged that the first end of the upper frame are arranged at the first end of the intermediate frame and the second end of the upper frame are arranged at the second end of the intermediate frame, and can be moved to an extended position in which the upper frame extends beyond the second end of the intermediate frame extends.

The subframe has a preferably straight, first guide extending between the front end and the loading end, along which the first end of the intermediate frame is slidably guided, the loading end being a first support element has, on which is supported a facing to the bottom surface and extending between the first and second ends of the intermediate frame first support rail of the intermediate frame.

The intermediate frame has a preferably rectilinear second guide extending between the first and second ends, along which the first end of the upper frame is slidably guided, the second end of the intermediate frame having a second support element on which a bottom surface and is supported between the first and second end of the upper frame extending second support rail of the upper frame.

Finally, the course of the second support rail between the first end and the second end of the upper frame is such that the angle that the loading surface encloses with the intermediate frame is reduced when the upper frame is moved from the retracted position to the extended position.

The subframe of the stretcher storage device according to the invention is designed such that it can be connected to the structure of the vehicle and the stretcher storage device is arranged in a cargo space of the vehicle. It is conceivable that the underframe is firmly connected to the floor of the cargo space. Alternatively, however, especially in armored vehicles, the floor area of which can be exposed to particular loads from mines, it is also possible to connect the underframe to the side walls or the ceiling area of the cargo space. In any case, however, the subframe is designed to be permanently coupled to the structure of the vehicle, that is to say to load-bearing parts of the body.

Furthermore, the configuration according to the invention of the second support rail enables the following sequence of movement of the intermediate frame and the upper frame away from the lower frame.

If the intermediate frame is displaced relative to the subframe parallel to the displacement movement of the upper frame relative to the intermediate frame in such a way that the intermediate frame covers essentially the same distance per unit of time relative to the subframe as the upper frame relative to the intermediate frame, it comes to a Combination of a sliding movement of the upper frame out of the loading space and a tilting movement downwards. On the one hand, the second end of the intermediate frame is pushed out over the loading end of the subframe facing the vehicle opening, the angle of inclination of the intermediate frame increasing further and further. It takes this angle of inclination is even an angle greater than a critical angle of 16 °, for example. On the other hand, at the same time the upper frame is pushed out over the second end of the intermediate frame, and the angle between the planes of the intermediate frame and the upper frame is reduced. This has the consequence that the sharply increasing inclination of the intermediate frame is compensated by the sharply decreasing angle between the upper frame and the intermediate frame. This compensation of the strong tilting movement of the intermediate frame downwards by a tilting movement of the upper frame relative to the intermediate frame is achieved according to the invention by an embodiment of the first and second support rails on the intermediate frame and upper frame, which is designed as a "double curve geometry".

This means that the first support rails with which the intermediate frame is supported on the subframe have a first, possibly curved, course which causes the intermediate frame to tilt downwards when it is extended. The second support rails on the upper frame, with which the latter is in turn supported on the intermediate frame, have a second, possibly also curved course, which is precisely opposite to the curved course of the first support rails. These double curves lead to the fact that the increasing inclination of the intermediate frame is compensated by the upper frame when extending.

As a result, the inclination of the upper frame relative to the horizontal does not exceed a limit angle of 16 °, for example, currently defined by DIN EN 1789. Nevertheless, the intermediate frame can take a much larger angle to the horizontal. Compared to the prior art, this in turn means that the length of the area required by the stretcher mounting device according to the solution according to the invention to overcome a given height difference is significantly shorter than the length required by a stretcher mounting device according to the prior art , in which the upper frame is telescopically extended from the intermediate frame. Because in the prior art, the intermediate frame must not exceed a critical angle of 16 °, for example.

In a preferred embodiment, the distance between the second guide and the first support rail, measured perpendicular to the second guide, increases from the first end of the intermediate frame to the second end of the intermediate frame. In addition or as an alternative, in this or an alternative embodiment the distance between the loading surface and the second support rail, measured perpendicular to the plane of the loading surface, increases from the second end of the upper frame to the first end of the upper frame. With the latter geometry, the effect is achieved that the angle between the upper frame and the intermediate frame is reduced when the upper frame is moved into the extended position.

In particular, the first end of the intermediate frame should be pivotably supported on the lower frame and / or the first end of the upper frame is pivotably supported on the intermediate frame.

In order to achieve a low-friction relative movement between the lower frame and the intermediate frame or between the intermediate frame and the upper frame, it is preferred that the first guide preferably has straight first rails in which pivot bearings are guided at the first end of the intermediate frame and / or the second guide preferably has rectilinear second rails in which pivot bearings held at the first end of the upper frame are guided.

In order to enable a motorized drive of the stretcher support device according to the invention, which reduces the burden on the operator, especially in the case of heavy patients, it is further preferred if a drive arrangement is provided which is designed to close the intermediate frame with respect to the subframe between the retracted position and the extended position move and move the upper frame relative to the intermediate frame between the retracted and the extended position.

It is particularly preferred if, for example, the control of the drive arrangement is designed such that the displacement movement between the subframe and the intermediate frame takes place parallel to the displacement movement between the intermediate frame and the upper frame, so that the intermediate frame takes the same distance per unit of time relative to the subframe covered like the upper frame relative to the intermediate frame. The drive device then ensures that the intermediate frame and the upper frame only assume those relative positions in which a predetermined limit angle for the inclination of the upper frame relative to the horizontal is not exceeded.

In a preferred embodiment, the drive arrangement has a first engagement element on the subframe, which extends between the front end and the loading end, wherein a drive motor is supported on the intermediate frame, which drives a second engagement element in rotation, wherein the first and the second engagement element in such a way Are engaged so that a rotation of the second engagement element causes the sliding movement of the intermediate frame relative to the subframe. That way you can the relative movement between the subframe and the intermediate frame can be easily implemented by means of a motor attached to the intermediate frame. In particular, the first engagement element can be designed as a toothed belt and the second engagement element as a toothed wheel that engages with the toothed belt.

In a further preferred manner, the second engagement element is fastened to a drive shaft which is driven to rotate by the drive motor and which is rotatably supported on the intermediate frame. Then, on the one hand, it is possible in a further preferred manner that a holder is attached to the drive shaft so as to be pivotable about it, on which a first and a second deflection roller are mounted rotatably about axes of rotation, the axes of rotation extending parallel to the drive shaft and in a plane of rotation axes which runs parallel and offset to the drive shaft, the axes of rotation in the plane of the axis of rotation being laterally spaced from the projection of the drive shaft onto the plane of the axis of rotation, and the toothed belt being guided around the first deflection roller, the gearwheel and the second deflection roller. This structure enables the drive motor to be fixedly attached to the intermediate frame, although this is pivoted relative to the subframe and thus to the direction of travel of the toothed belt.

On the other hand, a revolving drive belt can be held on a drive roller and at least one further roller on the intermediate frame, the drive roller being driven to rotate and a coupling piece connected to the upper frame being attached to the drive belt. The drive roller is more preferably attached to or on the drive shaft and is thus driven together with the gear. This enables only one motor to be required to effect the movement between the lower frame and the intermediate frame as well as that between the intermediate frame and the upper frame. This inevitably results in the parallel displacement movement described above.

Fig. 1

das Ausführungsbeispiel der erfindungsgemäßen Tragenlagerungseinrichtung in einer Schnittansicht in einer vollständig eingezogenen Stellung zeigt,

Fig. 2

eine Seitenansicht des Ausführungsbeispiels in einer vollständig ausgezogenen Stellung ist,

Fig. 3

eine perspektivische, teilweise aufgebrochene Ansicht eines Teils des Ausführungsbeispiels aus Fig. 1 zeigt, wobei der Zwischenrahmen und der Oberrahmen in der vollständig ausgezogenen Stellung sind,

Fig. 4

eine vergrößerte perspektivische Ansicht eines Teils aus Fig. 3 zeigt, ,

Fig. 5

eine Schnittansicht eines Details aus den Fig. 1 bis 3 ist, und

Fig. 6.

eine vergrößerte perspektivische Ansicht eines weiteren Teils aus Fig. 3 zeigt.

The present invention is described below with reference to a drawing showing only a preferred exemplary embodiment, wherein

Fig. 1

shows the embodiment of the stretcher support device according to the invention in a sectional view in a fully retracted position,

Fig. 2

is a side view of the embodiment in a fully extended position;

Fig. 3

a perspective, partially broken away view of part of the embodiment Fig. 1 shows with the intermediate frame and the upper frame in the fully extended position,

Fig. 4

Figure 3 is an enlarged perspective view of a portion Fig. 3 shows, ,

Fig. 5

a sectional view of a detail from the Figs. 1 to 3 is and

Fig. 6.

FIG. 3 is an enlarged perspective view of another part Fig. 3 shows.

As Figure 1 shows, the embodiment of a stretcher storage device 1 according to the invention has a schematically illustrated underframe 3, which can be attached to the underside 5 of the underside 5 of the bottom surface of the loading space of a vehicle, which is not illustrated. However, it is also possible, particularly in the case of armored vehicles whose floor area can be exposed to particular loads by mines, to attach the underframe 3 to the side walls or the ceiling area of the cargo space. In general, the underframe 3 is designed in such a way that it can be permanently coupled to the structure of the vehicle and thus to load-bearing parts of the body.

Furthermore, the stretcher mounting device 1 has a subframe 7 made up of two elements, which is arranged on the subframe 3 and is also firmly connected to it. In a preferred exemplary embodiment, the underframe 3 is designed in such a way that the inclination of the underframe 7 can be adjusted relative to the floor area of the cargo space. This makes it possible to change the inclination of a patient stretcher attached to the stretcher mounting device 1 when the stretcher mounting device 1 is in the retracted state.

The sub-frame 7 has a front end 9 and a loading end 11 and extends between them parallel to the floor surface. When the stretcher storage device 1 is arranged in the cargo space of a vehicle, the front end 9 is arranged away from the opening of the cargo space via which a patient stretcher is introduced into the cargo space, while the loading end 11 is positioned immediately adjacent thereto.

Furthermore, a straight first guide extending between the front end 9 and the loading end 11 is provided on the subframe 7, this first guide being designed as straight first rails 13 in the exemplary embodiment described here, which on outwardly facing sides of the elements of the subframe 7 are attached so that the openings of the first rails 13 face outwards (see Figure 3 ). In addition, the stretcher mounting device has an intermediate frame 15, which in turn has a first end 17 and a second end 19. In the present exemplary embodiment, the intermediate frame 15 is attached above the subframe 7 and on the subframe 7 such that it can be displaced such that it can assume a retracted position relative to the subframe 7, as shown in FIG Figure 1 and in which the intermediate frame 15 is arranged above the subframe 7 such that the first end 17 of the intermediate frame 15 is arranged at the front end 9 and the second end 19 of the intermediate frame 15 is arranged at the loading end 11. On the other hand, the intermediate frame 15 can be moved relative to the sub-frame 7 in an extended position, as shown in FIG Figures 2 and 3 and in which the intermediate frame 15 extends beyond the loading end 11 of the lower frame 7.

As also in the Figures 2 and 3 can be seen, the first end 17 of the intermediate frame 15 is pivotally supported on the subframe 7 by 15 arms 21 are provided at the first end 17 of the intermediate frame 15, which extend over the first rails 13 and on which pivot bearings 23 are held are guided in the first rails 13 displaceably.

In addition, especially in Figure 1 It can be seen that the loading end 11 has a first support element 25 in the form of bearings on which first support rails 27 of the intermediate frame 15 that point towards the floor surface and extend between the first and second ends 17, 19 of the intermediate frame 15 are supported. After all, in Figure 2 and 3 It can be seen that the intermediate frame 15 has second rails 29 which extend in a straight line between the first and second ends 17, 19 and which form a second guide.

As the Figures 1 to 3 show, the stretcher support device 1 has an upper frame 31, which in turn is arranged above the intermediate frame 15 and which has a flat loading surface 33 on which a patient stretcher, not shown in the figures, can be releasably attached.

Furthermore, the upper frame 31 has a first end 35 and a second end 37 and is attached to the intermediate frame 15 in a displaceable manner. The upper frame 31 can assume a retracted position relative to the intermediate frame 15, in which the upper frame 31 is arranged above the intermediate frame 15 that the first end 35 of the upper frame 31 is at the first end 17 of the intermediate frame 15 and the second end 37 of the Upper frame 31 are arranged at the second end 19 of the intermediate frame 15, as shown in FIG Figure 1 is shown. In addition, the upper frame 31 can be moved into an extended position in which the upper frame 31 extends beyond the second end 19 of the intermediate frame 15, like this in Figure 2 and 3 is shown. Finally, arms (not shown in detail) are provided on the upper frame 31 at the first end 35, which extend over the second rails 29 and to which pivot bearings are attached which are guided in the second rails 29. As a result, the first end 35 of the upper frame 31 can be pivoted and displaced on the intermediate frame 15.

Out Figure 2 it can be seen that at the second end 19 of the intermediate frame 15, second support elements 39 are attached, which are designed as bearings and on which the second support rails 41 of the upper frame 31, pointing towards the bottom surface and extending between the first and second ends 35, 37 Support the upper frame 31. These second support rails 41 are in turn shown in FIG Figure 2 to recognize.

The course of the second support rails 41 between the first end 35 and the second end 37 is such that the angle a that the loading surface 33 includes with the second guide or the second rails 29 and thus the plane of the intermediate frame 15 is reduced, when the upper frame 31 is moved from the retracted position to the extended position.

In the preferred embodiment described here, the distance between the second rails 29 and the first support rails 27, measured perpendicular to the second rails 29, increases from the first end 17 of the intermediate frame 15 to the second end 19 of the intermediate frame 15. In addition, this embodiment increases the distance between the loading surface 33 and the second support rails 41, measured perpendicular to the plane of the loading surface 33, from the second end 37 of the upper frame 31 to the first end 35 of the upper frame 31. With this geometry, the effect is achieved that the angle α between the upper frame 31 and the intermediate frame 15 when moving the upper frame 31 to the extended position.

As the Figures 3 to 5 show, a drive arrangement is provided in the present embodiment, which is designed to move the intermediate frame 15 relative to the lower frame 7 between the retracted position and the extended position and to move the upper frame 31 relative to the intermediate frame 15 between the retracted and the extended position.

The drive arrangement is designed such that the displacement movement between the lower frame 7 and the intermediate frame 15 takes place parallel to the displacement movement between the intermediate frame 15 and the upper frame 31 that the intermediate frame 15 covers the same distance per unit of time relative to the lower frame 7 as the upper frame 31 covers relative to the intermediate frame 15.

The drive arrangement initially has a first engagement element in the form of a two-part toothed belt 43 which is fastened to the lower frame 7 and extends between its front end 9 and its loading end 11. Furthermore, a drive motor (not shown) is mounted on the intermediate frame 15, which drives a second engagement element in the form of a gear wheel 47 to rotate, the gear wheel 47 being attached to a drive shaft 49 which is spaced from the motor shaft of the drive motor and which is rotatably supported in the intermediate frame 15 (please refer Figure 4 ). The gear 47 is in engagement with the toothed belt 43, as shown in FIG Figure 5 which reproduces a sectional view perpendicular to the drive shaft 49. Two holders 51, on which a first and a second deflection roller 53, 55 are rotatably mounted about axes of rotation 57, are attached to the drive shaft 49 so as to be pivotable about this. The axes of rotation 57 extend parallel to the drive shaft 49 and in a plane of the axis of rotation 59 which runs parallel and offset to the drive shaft 49. In addition, the axes of rotation 57 in the axis of rotation plane 59 are arranged laterally spaced from the projection of the drive shaft 49 onto the axis of rotation plane 59. The toothed belt 43 is omega-shaped around the first deflection roller 53, the gear 47 and the second deflection roller 55 (see Figure 5 ). This structure has the advantage that the intermediate frame 15 with the drive motor attached to it can be pivoted relative to the subframe 7 with the toothed belt 43 attached to it, without the toothed belt 43 disengaging from the toothed wheel 47.

In this structure, a rotation of the gear wheel 47 causes the sliding movement of the intermediate frame 15 relative to the subframe 7, since the intermediate frame 15 is pulled along the toothed belt 43 when the gear wheel 47 rotates.

Finally, a revolving drive belt 61 is guided on the intermediate frame 15 over a drive roller 63 and another roller 65, the drive roller 63 being fastened to the drive shaft 49 and thus driven in rotation by the drive motor together with the gear 47 (see Fig Figures 4 and 6th ). In addition, a coupling piece 67 is attached to the drive belt 61, which in turn is connected to the upper frame 31 via a holder 69, so that a movement of the drive belt 61 generated by the drive motor results in the displacement movement of the upper frame 31 (see also Figure 6 ).

The stretcher mounting device 1 described above can be made from the in Figure 1 retracted position shown in Figure 2 and 3 The extended position shown can be moved in that the drive motor is switched on so that the drive shaft 49 rotates. As a result, both the gear wheel 47 and the drive roller 63 rotate, so that parallel displacement movements of the intermediate frame 15 relative to the lower frame 7 and of the upper frame 31 relative to the intermediate frame 15 are effected by only one motor. In this context, it should be pointed out that additional means can be provided to rotate either the drive shaft 49 or the armature shaft of the drive motor by hand, so that the stretcher mounting device 1 can also be driven by hand and moved from the retracted to the extended position and vice versa .

On the one hand, the engagement of the gear 47 with the toothed belt 43 pulls the intermediate frame 15 over the loading end 11 of the lower frame 7 out of the loading space (not shown), whereby it is increasingly downwards due to the contact of the first support rails 27 with the first support elements 25 tends.

On the other hand, by rotating the drive roller 63, the drive belt 61 with the coupling piece 67 is moved, so that the second end 37 of the upper frame 31 moves beyond the second end 19 of the intermediate frame 15 and, due to the shape of the second support rails 41, in relation to the intermediate frame 15 pivots upward so that the angle α between the loading surface 33 and the intermediate frame 15 is reduced. This compensates for the increasing inclination of the intermediate frame 15 relative to the horizontal, so that the inclination of the loading surface 33 and a patient stretcher attached to it does not exceed a critical angle of 160, for example.

This compensation of the tilting movement of the intermediate frame 15 downwards by a tilting movement of the upper frame 31 relative to the intermediate frame 15 upwards is achieved in the exemplary embodiment by designing the first and second support rails 27, 41 on the intermediate frame 15 and upper frame 31 in the form of a "double curve geometry" . Specifically, this means that the first support rails 27, with which the intermediate frame 15 is supported on the subframe 7, have a first, possibly curved, course. When the intermediate frame 15 is extended, this causes it to tilt downwards. The second support rails 41 on the upper frame 31, with which it is supported on the intermediate frame 15, have a second, possibly also curved, course which is precisely opposite to the curved course of the first support rails 27. These double curves lead precisely to the fact that the increasing inclination of the intermediate frame 15 is compensated for by a pivoting movement of the upper frame 31 during extension.

The movement from the extended position back to the retracted position then takes place in the opposite way and even then the critical angle is of course not exceeded.

Because the intermediate frame 15 assumes a greater angle of inclination than the critical angle during the movement, the total length of the stretcher support device 1 is in the extended position (see FIG Figure 5 ) but much shorter than when the inclination of the intermediate frame 15 should not exceed the critical angle.

Reference number

1

Stretcher storage facility

3

Underframe

5

bottom

7th

Subframe

9

Front end

11

End of loading

13

first rails

15th

Intermediate frame

17th

first end - intermediate frame

19th

second end - intermediate frame

21st

poor

23

Pivot bearing

25th

first support elements

27

first support rails

29

second rails

31

Upper frame

33

Loading area

35

first end - upper frame

37

second end - upper frame

39

second support elements

41

second support rails

43

Timing belt

47

gear

49

drive shaft

51

holder

53

first pulley

55

second pulley

57

Axes of rotation

59

Axis of rotation plane

61

Drive belt

63

Drive roller

65

role

67

Coupling piece

69

holder

Claims (13)

1. Stretcher support device (1) with a bogie (3), the latter being designed to be connected to the structure of a vehicle such that the stretcher support device is arranged in a loading space of the vehicle,

   with a bottom frame (7), which is arranged on the bogie (3) and is rigidly connected to the latter, wherein the bottom frame (7) has a front end (9) and a loading end (11) and extends between these parallel to a floor surface,

   with a middle frame (15), which has a first end (17) and a second end (19) and which is mounted displaceably on the bottom frame (7) in such a way that it can be moved relative to the bottom frame (7) between a retracted position, in which the middle frame (15) is arranged over the bottom frame (7) so that the first end (17) of the middle frame (15) is arranged at the front end (9) and the second end (19) of the middle frame (15) is arranged at the loading end (11), and a deployed position, in which the middle frame (15) extends beyond the loading end (11) ,

   with a top frame (31), which has a flat loading surface (33) and also a first end (35) and a second end (37) and which is mounted displaceably on the middle frame (15) in such a way that it can be moved relative to the middle frame (15) between a retracted position, in which the top frame (31) is arranged over the middle frame (15) so that the first end (35) of the top frame (31) is arranged at the first end (17) of the middle frame (15) and the second end (37) of the top frame (31) is arranged at the second end (19) of the middle frame (15), and a deployed position, in which the top frame (31) extends beyond the second end (19) of the middle frame (15),

   wherein the bottom frame (7) has a first guide, which extends between the front end (9) and the loading end (11) and along which at least the first end (17) of the middle frame (15) is guided displaceably,

   wherein the loading end (11) has a first supporting element (25), on which a first support rail (27) of the middle frame (15) is supported, said first support rail (27) facing towards the floor surface and extending between the first end (17) and the second end (19) of the middle frame (15) ,

   wherein the middle frame (15) has a second guide, which extends between the first end (17) and the second end (19) and along which at least the first end (35) of the top frame (31) is guided displaceably,

   wherein the second end (19) of the middle frame (15) has a second supporting element (39), on which a second support rail (41) of the top frame (31) is supported, said second support rail (41) facing towards the floor surface and extending between the first end (35) and the second end (37) of the top frame (31), and

   wherein the course of the second support rail (41) between the first end (35) and the second end (37) of the top frame (31) is such that the angle (α), which the loading surface (33) encloses with the middle frame (15), decreases when the top frame (31) is moved from the retracted position to the deployed position.
2. Stretcher support device (1) according to Claim 1, wherein the first guide and the second guide are straight,

   wherein the distance between the second guide and the first support rail (27), measured perpendicular to the second guide, increases from the first end (17) of the middle frame (15) towards the second end (19) of the middle frame (15), and/or

   wherein the distance between the loading surface (33) and the second support rail (41), measured perpendicular to the plane of the loading surface (33), increases from the second end (37) of the top frame (31) towards the first end (35) of the top frame (31).
3. Stretcher support device (1) according to Claim 1 or 2, wherein the first end (17) of the middle frame (15) is mounted pivotably on the bottom frame (7) and
   wherein the first end (35) of the top frame (31) is mounted pivotably on the middle frame (15).
4. Stretcher support device (1) according to one or more of Claims 1 to 3, wherein the first guide has first rails (13), in which rotary bearings (23) mounted on the first end (17) of the middle frame (15) are guided.
5. Stretcher support device (1) according to one or more of Claims 1 to 4, wherein the second guide has second rails (29), in which rotary bearings mounted on the first end (35) of the top frame (31) are guided.
6. Stretcher support device (1) according to one or more of Claims 1 to 5, wherein a drive arrangement is provided, which is designed to displace the middle frame (15) relative to the bottom frame (7) between the retracted position and the deployed position and to displace the top frame (31) relative to the middle frame (15) between the retracted position and the deployed position.
7. Stretcher support device (1) according to Claim 6, wherein the drive arrangement is designed in such a way that the displacement movement between the bottom frame (7) and the middle frame (15) takes place parallel to the displacement movement between the middle frame (15) and the top frame (31), in such a way that the middle frame (15) travels relative to the bottom frame (7) by the same distance per unit of time as the top frame (31) travels relative to the middle frame (15).
8. Stretcher support device (1) according to Claim 6 or 7, wherein the drive arrangement has a first engagement element on the bottom frame (7), which first engagement element extends between the front end (9) and the loading end (11), and
   wherein a drive motor is mounted on the middle frame (15) and drives a second engagement element in rotation, wherein the first engagement element and the second engagement element are in engagement with each other in such a way that a rotation of the second engagement element brings about the displacement movement of the middle frame (15) relative to the bottom frame (7).
9. Stretcher support device (1) according to Claim 8, wherein the first engagement element is designed as a toothed belt (43), and the second engagement element is designed as a toothed wheel (47) that meshes with the toothed belt (43).
10. Stretcher support device (1) according to Claim 8 or 9, wherein the second engagement element is secured on a drive shaft (49), which is driven in rotation by the drive motor and which is mounted rotatably on the middle frame (15).
11. Stretcher support device (1) according to Claims 9 and 10, wherein a retainer (51) is mounted on the drive shaft (49) in such a way as to be pivotable about the latter, and a first deflection roller (53) and a second deflection roller (55) are mounted on the retainer (51) in such a way as to be rotatable about rotation axes (57),

    wherein the rotation axes (57) extend parallel to the drive shaft (49) and in a rotation axis plane (59), which is parallel and offset with respect to the drive shaft (49),

    wherein the rotation axes (57) are arranged in the rotation axis plane (59) at a lateral distance from the projection of the drive shaft (49) onto the rotation axis plane (59), and

    wherein the toothed belt (43) is guided about the first deflection roller (53), the toothed wheel (47) and the second deflection roller (55).
12. Stretcher support device (1) according to one or more of Claims 3 to 11, wherein a peripheral drive belt (61) on the middle frame (15) is mounted on a drive roller (63) and at least one further roller (65),

    wherein the drive roller (63) is driven in rotation and

    wherein a coupling piece (67), which is connected to the top frame (31), is secured on the drive belt (61) .
13. Stretcher support device (1) according to Claims 10 and 12, wherein the drive roller (63) is secured on the drive shaft (49).

Images