Bed frame for a hospital and / or nursing bed

Abstract

The invention relates to a bed frame for a hospital and / or nursing bed, comprising a scissor mechanism (4) for the height adjustment of a bed frame (5) supported by the scissor mechanism (4) and comprising a first and a second undercarriage (1, 2) which is in each case arranged on the scissor mechanism (4), wherein an undercarriage (1, 2) comprises a crosspiece (7) having bearing bushes (8, 9) at the end faces for the respective reception of a wheel unit (10, 11) with a wheel disc (12, 13; 14, 15) that is rotatably mounted about an axis of rotation (16, 17), characterized in that an undercarriage (1, 2) has a connection extension (18, 19) which points downwards starting from the crosspiece (7), is arranged at one end face on the crosspiece (7) and has at the other end face a bearing lug (20, 21) for the rotationally pivotably arrangement on the scissor mechanism (4), wherein the axis of rotation (22, 23) defined by the bearing lug (20, 21) extends in the direction of height (6) of the undercarriage (1, 2) below the axis of rotation (16, 17) of a wheel disc (12, 13; 14, 15).

Description

[0001] The invention relates to a bed frame for a hospital and / or nursing bed, with a scissor mechanism for adjusting the height of a bed frame supported by the scissor mechanism, and with a first and a second chassis each arranged on the scissor mechanism, wherein a chassis has a crossbeam with end-end bearing bushings for receiving a wheel unit with a wheel disc rotatably mounted about an axis of rotation.

[0002] Beds in general, and bed frames for beds in particular, are known from the prior art, for example US 2014 033 435 A1.

[0003] In its intended use, a bed frame serves to support a bed base. The bed base, in turn, serves to hold a mattress support, such as a slatted frame, or is designed as such.

[0004] In addition, hospital and / or nursing beds usually have a height adjustment mechanism that supports the bed frame and serves to move the bed frame and mattress base in height and adjust it as needed.

[0005] A height adjustment device can be designed as a hydraulically or pneumatically operated lifting device or as a scissor mechanism.

[0006] A lifting device typically has two lifting cylinders, one for each headboard, located on the outside of the respective headboard. A particular advantage of such a lifting device is that the bed can be lowered significantly to a comparatively low entry height. This is possible because the lifting cylinders are not mounted underneath the bed frame, but rather on the outside of the headboards, thus not obstructing the downward movement of the bed frame. However, the external mounting of the lifting cylinders on the headboards also has a disadvantage. A bed equipped with lifting cylinders is bulkier in the longitudinal direction, which makes maneuvering the bed more difficult when repositioning it and can prevent its placement in storage areas with standardized dimensions. Transport devices, such as those used in hospitals and / or nursing homes, are particularly important in these situations.Elevators, as well as doors, corridors and / or the like, are designed with standardized dimensions and generally only allow for the difficult use of beds equipped with a lifting device that do not meet this standard.

[0007] To avoid the aforementioned disadvantages, a scissor mechanism is used as the height adjustment device. This is located below the bed frame, so that a bed equipped with this mechanism does not extend lengthwise, making it easily maneuverable and, in particular, compatible with the dimensions typical in hospitals and / or nursing homes.

[0008] Although a bed frame with a scissor mechanism has proven its worth in everyday use, it is not without its drawbacks. The placement of the scissor mechanism beneath the bed frame means that the bed can only be lowered to a relatively high entry height. This disadvantage is all the more significant if the bed is mobile and therefore has a corresponding chassis, which is also located beneath the bed frame, specifically below the scissor mechanism.

[0009] In accordance with a typical and generic design, each headboard section has its own chassis. The bed frame therefore has a first chassis at the head end and a second at the foot end, both mounted on the scissor mechanism and supporting its movement. The chassis are connected to each other by longitudinal struts, providing the necessary stability when the scissor mechanism is in use. Each chassis has a crossbeam running transversely across the bed with end bearings that accommodate a wheel assembly. Each wheel assembly has a wheel disc mounted so that it can rotate around a pivot axis.

[0010] The outer diameter of such a wheel disc has a significant influence on the entry height achievable when the scissor mechanism is lowered, because the smaller the outer diameter of the wheel disc, the lower the entry height. However, the smaller the outer diameter of the wheel disc, the less smooth and comfortable the operation of the bed when used as intended. Furthermore, comparatively small wheel discs do not allow for the integration of a parking brake, which would be desirable and easy to operate. Thus, conflicting interests exist regarding the size of the wheel discs used. And so, a bed with a typical bed frame has an entry height of, for example, 250 mm.

[0011] Based on the aforementioned state of the art, the Taskthe invention to further develop a generic bed frame in such a way that a comparatively low entry height of less than 250 mm is achieved in terms of construction, while maintaining or even improving the walking comfort in a standard method of using a bed equipped with such a bed frame.

[0012] To Solution The invention proposes a bed frame of the type mentioned at the outset to solve this problem, characterized in that a chassis has a connecting extension extending downwards from the crossbeam, which is arranged on the crossbeam at one end and has a bearing eye at the other end for a rotatable arrangement on the scissor mechanism, wherein the axis of rotation defined by the bearing eye runs below the axis of rotation of a wheel disc in the vertical direction of the chassis.

[0013] In prior art bed frames, a crossbeam is provided on which both the wheel units and the scissor mechanism are arranged. In contrast, the bed frame according to the invention has a chassis in which only the wheel units are arranged on the crossbeam. A connecting extension is provided for coupling the scissor mechanism. According to the invention, the scissor mechanism is therefore not arranged directly on the crossbeam, but indirectly via the connecting extension. The connecting extension points downwards from the crossbeam.

[0014] For the swiveling arrangement of the chassis on the scissor mechanism, the connecting extension is equipped with a bearing eye. In the fully assembled state, this receives a corresponding coupling element for the swiveling arrangement of the scissor mechanism.

[0015] Of essential importance to the invention is that the axis of rotation defined by the bearing eye runs below the axis of rotation of a wheel disc in the vertical direction of the chassis. This means that the connection point of the scissor mechanism is offset downwards compared to the prior art, specifically below the axis of rotation of a wheel disc of a wheel unit. This advantageously results in a significantly reduced entry height of, for example, 100 mm when the scissor mechanism is lowered, in contrast to the prior art. Nevertheless, despite this low entry height, comparatively large wheel discs with, for example, an outer diameter of 100 mm can be used, thus ensuring smooth running and good ride comfort in the intended application.

[0016] With the design according to the invention, the connection point of the scissor mechanism to the respective chassis is offset downwards in the vertical direction of the chassis. This lowering of the scissor mechanism is not achieved at the expense of smaller wheel discs and the associated disadvantages. Rather, a design solution is provided in that a connecting extension is used, which is arranged on the crossmember at one end and provides a bearing eye at the other end for connecting the scissor mechanism. The connecting extension points downwards from the crossmember in the vertical direction of the chassis, thereby achieving the lower positioning of the scissor mechanism relative to the chassis compared to the prior art.

[0017] The inventive design proposes for the first time a bed frame which does not have a lifting device, but rather a scissor mechanism for adjusting the height of the bed frame, yet can be lowered to a very low entry height of, for example, 100 mm, and this with the simultaneous use of comparatively large wheel discs, which ensures smooth running and good running comfort in the intended use.

[0018] According to a further feature of the invention, it is provided that a chassis has two connecting extensions, wherein the axes of rotation defined by the bearing eyes of the connecting extensions are aligned.

[0019] According to this proposed invention, not just one, but two connecting extensions are used to attach the scissor mechanism to the chassis. This provides increased stability to the overall structure. Furthermore, any potential tipping moment is counteracted, since the scissor mechanism is supported at two points on each chassis.

[0020] The rotatable and pivotable arrangement of the scissor mechanism on a chassis is necessary to enable length compensation along the length of the bed during intended use of height adjustment. In this case, the scissor mechanism rotates relative to the chassis around the axes of rotation provided by the bearing eyes. To ensure this rotation is free of tilting, the axes of rotation provided or defined by the bearing eyes are aligned with each other.

[0021] According to a further feature of the invention, the connecting extensions are formed off-center in the region of an end section of the crossbeam. The distance between the connecting extensions in the longitudinal direction of the crossbeam is thus maximized, which is advantageous for the stability and force-bearing capacity of a chassis under load. As a result, a long service life is ensured.

[0022] According to a further feature of the invention, the crossbeam and the connecting extensions are made of steel and welded together. This results in a materially bonded and therefore particularly robust overall construction. This is also advantageous for a long service life and an overall stable construction.

[0023] According to a further feature of the invention, it is provided that receiving spaces are provided laterally and / or below the bed frame supported by the scissor mechanism, which serve to receive a crossbeam of a chassis when the scissor mechanism is in a retracted position.

[0024] Since, according to the invention, the scissor mechanism is offset downwards compared to a crossbeam of a bed frame, receiving recesses are provided on the bed frame side to maximize the travel distance. The crossbeams of the bed frames can be inserted into these recesses when the scissor mechanism is lowered. These receiving recesses enable maximum travel because the insertion of the crossbeams into these recesses prevents them from colliding with other bed components, such as the scissor mechanism itself or the bed frame. In the retracted state of the scissor mechanism, it is folded to its maximum extent and lies between the crossbeams of the bed frames, which in turn are inserted into the designated receiving recesses. This results in an optimized, compact design, which also contributes to achieving the lowest possible entry height.

[0025] According to a further feature of the invention, it is provided that the crossbeams of the two chassis are free of a common longitudinal strut.

[0026] The chassis used in state-of-the-art designs typically feature a longitudinal brace. This longitudinal brace connects the crossbeams of the two chassis, ensuring stability. However, a disadvantage of this design is that it limits the downward movement of the scissor mechanism, resulting in a comparatively high entry height. This is because the longitudinal brace connecting the crossbeams restricts the downward movement of the scissor mechanism and / or the bed frame. The design according to the invention overcomes this limitation, as the crossbeams are free of a common longitudinal brace. Therefore, there is no downward restriction on the travel.

[0027] This embodiment according to the invention is advantageous for a further reason. Since, according to the prior art, the crossbeams of the two carriages are positively coupled via a longitudinal brace, it is not possible to compensate for the distance between the two carriages when the scissor mechanism is adjusted vertically. According to the prior art, this necessitates connecting the scissor mechanism to the carriages by means of a fixed bearing on the one hand and a floating bearing on the other. In the case of vertical movement, length compensation between the carriages is achieved via the floating bearing. This design is comparatively complex and expensive.With the embodiment according to the invention, such a loose bearing construction can be completely dispensed with, since the bogies are not coupled to each other via a common longitudinal strut, so that length compensation between the bogies can occur solely by changing the distance between them. This is easily achieved by the fact that each bogie is designed to be movable due to its wheel units. The length or distance compensation between the bogies required when the scissor mechanism is in motion is therefore made possible by the design according to the invention without additional components, simply by allowing relative movement of the two bogies in the longitudinal direction of the chassis.

[0028] According to a further feature of the invention, each chassis is provided with only two wheel units. Thus, the first bearing bushing accommodates a first wheel unit and the second bearing bushing accommodates a second wheel unit. Wheel nacelles or double wheel units are therefore not provided. This advantageously simplifies the overall design.

[0029] According to a further feature of the invention, each wheel unit is provided with two wheel discs rotatably mounted about a common axis of rotation. A wheel unit thus has two wheel discs that are rotatable about a common axis. The use of two wheel discs per wheel unit improves stability.

[0030] According to the invention, the crossbeams of the two bogies are free of a common longitudinal brace in the manner described above, in order to achieve the lowest possible entry height. Furthermore, for an overall simplified design, preferably only two wheel units are provided per bogie. The combination of these features results in a certain degree of instability per bogie, particularly under load. Since the bogies are arranged to pivot on the scissor mechanism to compensate for spacing differences, they can unintentionally pivot and fold inwards relative to the scissor mechanism under load. According to the prior art, such pivoting is not possible because either the crossbeams are coupled to each other via a longitudinal brace or because double wheel units or gondola wheels are used.To remedy this without complicating the design, the invention proposes, according to a further feature, that a chassis provides a support device arranged on the crossbeam, wherein the support device has a support body that supports the crossbeam against the ground and is arranged at a distance from the crossbeam in the transverse direction.

[0031] The support device provided in this preferred embodiment serves to keep the chassis stable and upright, even under load. The support device thus ensures that the chassis cannot unintentionally pivot relative to the scissor mechanism, despite the lack of longitudinal bracing and the presence of only two wheel units. This is because the support device counteracts a tilting moment acting on the chassis, particularly under load, thereby providing the necessary stability. In contrast to previously known designs, the inventive design of the support device is significantly less complex and elaborate in its construction and, moreover, does not impede the desired low entry height, a disadvantage inherent in previously known designs. Therefore, this inventive design proves advantageous in two respects.On the one hand, it allows for a low entry height, and on the other hand, it ensures a simple and cost-effective overall construction.

[0032] The support device includes a support body. In normal use, this rests on the ground at the installation site, thus providing the previously described bracing of the crossbeam against the ground. The support body is positioned at a distance from the crossbeam in the transverse direction, ensuring that any tipping moments expected during normal use are reliably absorbed.

[0033] In combination with the connecting extension according to the invention, the synergistic effect of a stable and secure construction is achieved while simultaneously ensuring a low entry height.

[0034] According to a further feature of the invention, the support device includes a support strut that is arranged on one end of the crossbeam and supports the support body on the other end. The support strut serves to space the support body away from the crossbeam. It thus extends transversely to the crossbeam, being attached to the crossbeam at one end and supporting the support body on the other.

[0035] According to a further feature of the invention, the support body is a wheel rotatable about a vertical axis, with a wheel disc rotatable about a pivot axis. Designing the support body as a wheel offers the advantage that the intended movement of the bed frame is not impeded. Furthermore, it is preferred to design the support body as a steerable wheel, so that any maneuvering of the bed frame is not hindered.

[0036] According to a further feature of the invention, a support strut is arranged centrally between the two bearing bushings of a crossbeam. This central configuration is particularly advantageous for improved stability. Tilting moments that may occur under load can thus be reliably absorbed, while avoiding undesirable torques around the longitudinal axis of the support strut.

[0037] According to a further feature of the invention, the end sections of the support struts of the first and second chassis, which carry the respective support bodies, are oriented towards each other. The support struts and support bodies thus do not protrude below the bed frame, but are aligned towards the center of the bed frame. This avoids unnecessary tripping hazards, creates a visually appealing appearance, and also results in a compact design.

[0038] According to a further feature of the invention, a wheel disc of a wheel unit of a chassis has an outer diameter of 100 mm. Despite the low entry height achieved with the design according to the invention, the use of comparatively large wheel discs with an outer diameter of 100 mm is possible. This results in increased smooth running and improved ride comfort. Furthermore, the design of such large wheel discs allows for the use of a centrally actuated braking device for each chassis, which acts equally on both wheel units. This also improves ease of operation and enhances safety.

[0039] The invention also proposes a chassis as such with the features described above, as well as a hospital and / or nursing bed with a bed frame according to the invention.

[0040] Further features and advantages of the invention will become apparent from the following description with reference to the figures. These show Fig. 1 shows a schematic perspective view of a chassis of the bed frame according to the invention; Fig. 2 shows a schematic exploded view of the chassis according to the invention. Fig. 1 ; Fig. 3 in another schematic perspective view the chassis according to Fig. 1 Fig. 4 shows a schematic front view of the chassis. Fig. 1 Fig. 5 shows a schematic top view of the landing gear. Fig. 1 Fig. 6 shows a schematic side view of the chassis. Fig. 1 Fig. 7 shows a schematic perspective view of a bed frame according to the invention; Fig. 8 shows a schematic top view of the bed frame according to the invention. Fig. 7 ; Fig. 9 in partially cut-away side view of the bed frame according to Fig. 1 ; Fig. 10 in a partially cut-away side view shows a first chassis according to detail B. Fig. 9and Fig. 11 shows a partial section of a second chassis according to detail C in a partially cut-away side view. Fig. 9 .

[0041] The Figures 1 to 6 The figures show, in different views, a first chassis 1 of a bed frame 3 according to the invention. The bed frame 3 itself is shown in the Figures 7 to 11 shown in different views.

[0042] Bed frame 3 is specifically designed for a hospital and / or nursing home bed. As a summary of the Figures 7 to 11As a result, the bed frame 3 has a height adjustment mechanism in the form of a scissor mechanism 4 for adjusting the height of a bed frame 5 supported by the scissor mechanism 4. In the illustrated embodiment, the bed frame 5 is designed as a slatted base 35 and has a plurality of slats 36. The slatted base 35 is divided into different segments, namely a head segment 37, a middle segment 38, a leg segment 39, and a foot segment 40. The head segment 37, the leg segment 39, and the foot segment 40 are each pivotable, which allows the slatted base 35 to be adjusted to different lying positions.

[0043] The bed frame 3 further comprises a first chassis 1 and a second chassis 2, with the first chassis 1 being located at the head end and the second chassis 2 at the foot end. The chassis 1 and 2 are each arranged on the scissor mechanism 4 and, in the intended use, support the movable bed frame 3.

[0044] As can be seen in particular from a review of the Figures 1 to 6As can be seen using the example of the head-end chassis 1, the chassis 1 has a crossbeam 7 with end bearing bushings 8 and 9 for each receiving a wheel unit 10 or 11. Each wheel unit 10 or 11 in turn has wheel discs 12 and 13 or 14 and 15, respectively, which are rotatably mounted about a pivot axis 16 or 17. Due to their mounting in the bearing bushings 8 and 9, the wheel units 10 and 11 are also rotatable about their vertical axis, thus making the chassis 1, and therefore the bed frame 3 it supports, steerable. This is illustrated in the drawings by the different orientations of the wheel units 10 and 11. The wheel units of the foot-end chassis 2, which are not shown in detail in the figures, are designed as so-called fixed casters, i.e., as non-steerable wheel units.Alternatively, these wheel units can also be designed to rotate around their vertical axis and be blocked in this rotational movement by means of a parking brake, thus creating quasi-fixed casters.

[0045] As can be seen in particular from the Figures 1 to 6 As a result, the chassis 1 has two downward-pointing connecting extensions 18 and 19 extending from the crossbeam 7. The connecting extensions 18 and 19 are each arranged on one end of the crossbeam 7 and each have a bearing eye 20 or 21 on the other end.

[0046] The bearing eyes 20 and 21 serve to enable the chassis 1 to be rotatably pivoted on the scissor mechanism 4. The scissor mechanism 4 has corresponding receptacles for this purpose, so that, in the final assembly state, a bolt, for example, is secured in position on one side in a bearing eye and on the other side in the corresponding receptacle of the scissor mechanism 4. As a result, the chassis 1 is rotatably pivotable relative to the scissor mechanism 4, with the bearing eyes 20 and 21 defining aligned axes of rotation 22 and 23. Instead of bearing eyes, another type of articulated connection can also be used. However, the bearing eye design has the advantage of being inexpensive to manufacture, easy to assemble and disassemble, and also stable.

[0047] As can be seen from the presentation according to Fig. 1As a result, the aligned axes of rotation 22 and 23 of the bearing eyes 20 and 21 are arranged in the vertical direction 6 below the axes of rotation 16 and 17 of the wheel discs 12 and 13 or 14 and 15 of the wheel units 10 and 11 respectively.

[0048] As can be seen in particular from a review of the Figures 2 and 3 As a result, the chassis 1 further comprises a braking device 30. This device has a lever 31 pivotably mounted on the crossmember 7, which runs parallel to the crossmember 7 at a distance from it, with two bearing levers 34 positioned between them. End pieces 32 are provided at each end of the lever 31, which are, for example, made of a plastic material or coated with plastic. The braking device 30 is foot-operated by means of the lever 31, whereby the braking device 30 acts on both wheel units 10 and 11 simultaneously when in use, thus enabling central and safe braking.

[0049] As the exploded view according to Fig. 2 Furthermore, as can be seen, a common rod 33 is provided for the secure positioning of the wheel units 10 and 11 in the respective bearing bushings 8 and 9. In the fully assembled state, this rod extends through the hollow crossmember 7 and secures the corresponding wheel unit 10 or 11 in the associated bearing bushing 8 or 9 with its respective end sections. A particular advantage of this design is the ease of assembly and disassembly, as it allows for simultaneous operation of both wheel units 10 and 11.

[0050] The chassis 1 also has a support device 24, as can also be seen from a review of the Figures 1 to 6The support device 24, in turn, has a support body in the form of a wheel 26, which is arranged at a distance from the crossbeam 7 in the transverse direction 43 via an intermediate support strut 25. The chassis 1 thus has a total of three wheels: the wheel units 10 and 11 on the one hand, and the wheel 26 of the support device 24, which serves as a support body. This creates a three-point support for the chassis 1.

[0051] The support strut 25 is attached to the traverse 7 by means of an intermediate connecting element 29, so that the scissor mechanism 4 is not restricted by the support strut 25 during a downward movement in the vertical direction 6.

[0052] The aforementioned construction according to the invention offers numerous advantages.

[0053] In comparison to the prior art, the downward-pointing connecting extensions 18 and 19 in the vertical direction 6 result in the scissor mechanism 4 being offset further downwards relative to the crossbeam 7 of the bogies 1 and 2. This is because the connecting extensions 18 and 19 ensure that the pivot axes 22 and 23 of the bearing eyes 20 and 21, which are intended for connection to the scissor mechanism 4, lie below the pivot axes 16 and 17 of the wheel discs 12 and 13, and 14 and 15, respectively, in the vertical direction 6. This allows, unlike in the prior art, a lowering of the scissor mechanism, resulting in a reduced entry height.

[0054] In contrast to the prior art, the design lacks a forced coupling of the chassis 1 and 2 by means of a longitudinal brace. While such a longitudinal brace offers the advantage of improved stability, it has the disadvantage that the downward movement of the scissor mechanism 4 in the vertical direction 6 is limited by the longitudinal brace. This limitation is eliminated in the embodiment according to the invention, so that the lowering of the scissor mechanism 4 achieved with the connecting extensions can actually be utilized.

[0055] Since the lack of longitudinal bracing results in a loss of stability, each chassis is equipped with a corresponding support device. This device ensures that any tipping moments that may occur under load are absorbed. Despite the absence of longitudinal bracing, this results in a safe and stable stance.

[0056] The absence of longitudinal bracing, i.e., the forced coupling of the two chassis 1 and 2, provides a further advantage. For proper adjustment of the scissor mechanism 4, it is necessary to mount the scissor mechanism 4 variably in the longitudinal direction so that length compensation can occur. In the design according to the invention, this is achieved simply by allowing the two chassis 1 and 2 to move relative to each other due to the lack of forced coupling. For a secure stand, it is sufficient to actuate the brake 30 of one chassis to lock the corresponding wheel units. The other chassis is then positioned with a variable distance relative to the locked chassis, so that its movement allows the length compensation required when the scissor mechanism 4 is operated.

[0057] The support body designated as the third wheel 26 also has the advantage that the landing gear 1 or 2 requires only two wheel units. Neither wheel nacelles nor double wheel units are needed on each side of the landing gear. This is because the three-point support ensures a secure footing for each landing gear.

[0058] As a result, the inventive design provides a reduced entry height of, for example, 150 mm instead of the 250 mm otherwise typical in connection with a scissor mechanism. Furthermore, the inventive design allows the use of comparatively large wheel discs 12 and 13 or 14 and 15, for example, 100 mm in diameter, thus ensuring not only the low entry height but also smooth running and good ride comfort during operation. Reference sign

[0059] 1 Chassis 2 Chassis 3 Bed frame 4 Scissor mechanism 5 Bed frame 6 Height direction 7 Crossbeam 8 Bearing bush 9 Bearing bush 10 Wheel unit 11 Wheel unit 12 Wheel disc 13 Wheel disc 14 Wheel disc 15 Wheel disc 16 Pivot axle 17 Pivot axle 18 Connecting extension 19 Connecting extension 20 Bearing eye 21 Bearing eye 22 Pivot axle 23 Pivot axle 24 Support device 25 Support strut 26 Wheel 27 Wheel disc 28 Wheel disc 29 Connecting element 30 Brake device 31 Lever 32 End piece 33 Rod 34 Bearing lever 35 Slatted frame 36 Slat 37 Head segment 38 Middle segment 39 Leg segment 40 Foot segment 41 Storage space 42 End profile 43 Transverse direction

Claims

1. Bed frame for a hospital and / or nursing bed comprising a scissor mechanism (4) for height adjustment of a bed frame (5) supported by the scissor mechanism, and a first and a second undercarriage (1, 2) each arranged on the scissor mechanism (4), wherein an undercarriage (1, 2) has a crossbar (7) with end-side bearing bushes (8, 9) for respectively receiving a wheel unit (10, 11) having a wheel disc (12, 13; 14, 15) supported for rotation around an axis of rotation, characterized in that an undercarriage (1, 2) has a connection appendix (18, 19) pointing downwards from the crossbar (7) which is arranged on the crossbar (7) at one end and has a bearing eye (20, 12) for the rotary pivoting arrangement on the scissor mechanism (4) at the other end, wherein the axis of rotation (22, 23) defined by the bearing eye (20, 21) runs below the axis of rotation (16, 17) of a wheel disc (12, 13; 14, 15) in the height direction (6) of the undercarriage (1, 2).

2. Bed frame according to claim 1, characterized in that an undercarriage (1, 2) has two connection appendices (18, 19), wherein the axes of rotation (22, 23) defined by the bearing eyes (20, 21) of the connection appendices (18, 19) are aligned with each other.

3. Bed frame according to claim 2, characterized in that the connection appendices (18, 19) are each formed off-center in the region of an end section of the crossbar (7).

4. Bed frame according to any of the preceding claims, characterized in that the crossbar (7) and the connection appendices (18, 19) are made of steel and are welded together.

5. Bed frame according to any of the preceding claims, characterized in that receiving spaces (41) are provided laterally of and / or below the bed frame (5) supported by the scissor mechanism (4) which serve to receive a respective crossbar (7) of the undercarriage (1, 2) when the scissor mechanism (4) is in the retracted position.

6. Bed frame according to any of the preceding claims, characterized in that the crossbars (7) of the two undercarriages (1, 2) are free from shared bracing.

7. Bed frame according to any of the preceding claims, characterized in that exclusively two wheel units (10, 11) are provided per undercarriage (1, 2).

8. Bed frame according to any of the preceding claims, characterized in that two wheel discs (12, 13; 14, 15) supported for rotation around a common axis are provided per wheel unit (10, 11).

9. Bed frame according to any of the preceding claims, characterized in that a wheel disc (12, 13, 14, 15) has an outer diameter of 100 mm.

10. Bed frame according to any of the preceding claims, characterized in that each undercarriage (1, 2) is equipped with a centrally operated braking device (30) that equally acts on both wheel units.

11. Bed frame according to any of the preceding claims, characterized in that an undercarriage (1, 2) provides a supporting device (24) arranged on the crossbar (7), wherein the supporting device (24) has a support body supporting the crossbar (7) against the base which is spaced apart from the crossbar (7) in the transverse direction (47) of the crossbar (7).

12. Bed frame according to claim 11, characterized in that the supporting device (24) has a supporting strut (25) which is arranged on the crossbar (7) at one end and which carries the support body at the other end.

13. Bed frame according to claim 11 or 12, characterized in that the support body has a wheel (26) which is rotatable around a vertical axis and which comprises a wheel disc (27, 28) which is rotatable around an axis of rotation.

14. Bed frame according to claim 12 or 13, characterized in that a support strut (25) is centrally arranged between the two bearing bushes (8, 9) of a crossbar (7).

15. Bed frame according to any of the preceding claims 12 to 14, characterized in that the end sections of the support struts (25) of the first and the second undercarriage (1, 2) supporting the respective support body are facing each other.

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