Patient bed

Abstract

The utility model relates to a patient bed, it has the bottom disc, the at least four wheels of arrangement on the bottom disc and additional wheel device, wherein, additional wheel device includes at least one additional wheel and lifting module, wherein, lifting module has first lever unit and second lever unit, wherein, first lever unit and second lever unit are connected in the middle section, wherein, additional wheel is connected with first lever unit, wherein, additional wheel device is pivotably connected with the bottom disc at the first end of first lever unit, and is pivotably connected with the bottom disc at the second end of second lever unit along the longitudinal direction of patient bed, wherein, lifting module is configured for, by the pivot of first or / and second lever unit makes additional wheel raise and / or drop.

Description

Technical Field

[0001] This utility model relates to a patient bed having a chassis, at least four wheels arranged on the chassis, and an additional wheel device. Background Technology

[0002] Flexible patient beds are designed for different medical environments to promote patient flexibility and facilitate transport within the medical facility.

[0003] For example, flexible patient beds are used for transport within a hospital to move patients from one location to another. This can include transferring patients between different departments, examination rooms, or operating rooms.

[0004] In addition, flexible patient beds are used for emergency transport to ensure the safe and rapid transport of patients within the hospital or when transferring them to other medical facilities.

[0005] In the operating room, flexible patient beds are used to safely and comfortably position patients for surgical procedures. These beds allow medical staff to move and position patients during surgery.

[0006] In diagnostic procedures such as X-ray examinations, CT scans, or MRI scans, flexible patient beds can be used to safely and accurately move patients to the required location.

[0007] To facilitate the movement or relocation of the patient bed, the flexible patient bed chassis may include, for example, four freely rotatable driven rollers at corresponding corners of the patient bed, and a fifth wheel centrally positioned between the driven rollers. The fifth wheel is pressed against the ground via a spring mechanism and acts as a guide wheel. In the manual operation mode of the patient bed, the fifth wheel enables simple linear movement or movement around tight curves, and allows the patient bed to rotate around the fifth wheel when stationary. For electrically supported or automatic operation modes of the patient bed, the fifth wheel may optionally be equipped with a drive motor, which can electrically support or independently achieve the movement of the patient bed. Currently, the operator's task is to preset the direction of bed movement by rotating the patient bed around the fifth wheel. The four driven rollers are oriented in the direction preset by the user and follow the manual preset.

[0008] Such a patient bed is known, for example, from German utility model document DE 202016007430.

[0009] In medical practice, height-adjustable patient beds are essential for facilitating patient loading and unloading and for achieving optimal positioning during medical examinations or treatments. Typically, height adjustment is achieved through electrically operated lifting mechanisms, often in the form of scissor mechanisms. These mechanisms have proven effective, but they are not without challenges.

[0010] A problem arising in designing this type of patient bed is the combination of the centrally located fifth wheel and the lifting mechanism directly above it. This situation leads to structural space issues, which have a particularly adverse impact on the minimum bed height. In the past, efficient industrial solutions, such as electrically driven units, were used. These solutions were able to place the fifth wheel within the structural space of the lifting unit. However, the challenge in this adaptation is that, despite the fifth wheel being integrated into a limited space, the maximum descent of the bed is still restricted. The lifting unit can no longer move downwards as deeply as before, which can impact usability and patient comfort. Summary of the Invention

[0011] This invention relates to the problem in which the objective of the invention is to provide an additional wheel device with a fifth wheel, the additional wheel device being constructed and / or arranged such that maximum descent can also be achieved.

[0012] This task is solved by a patient bed according to the present invention. Preferred and / or alternative, advantageous design variations are the subject of the following description.

[0013] Subsequently, the solution to this task relative to the claimed apparatus according to the present invention is described. The features, advantages, or alternative embodiments mentioned herein can also be applied to other claimed subjects, and vice versa. In particular, a method can also be improved by incorporating features described or claimed in conjunction with one of the apparatuses. The corresponding functional features of the method are here configured through corresponding specific modules or units.

[0014] Regardless of the grammatical gender of specific terms, this includes people with male or female identities.

[0015] In a first aspect, the present invention relates to a patient bed. The patient bed includes a chassis, at least four wheels arranged on the chassis, and an additional wheel assembly, wherein the additional wheel assembly includes at least one additional wheel and a lifting module, wherein the lifting module has a first lever unit and a second lever unit, wherein the first lever unit and the second lever unit are operatively connected in an intermediate section, wherein the additional wheel is connected to the first lever unit, wherein the additional wheel assembly is pivotally connected to the chassis at a first end of the first lever unit and pivotally connected to the chassis at a second end of the second lever unit along the longitudinal direction of the patient bed, wherein the lifting module is configured to raise and / or lower the additional wheel by means of pivoting the first lever unit and / or the second lever unit.

[0016] The chassis of a patient bed is essentially a basic support or frame on which the bed is built and can move. In addition to the chassis, a patient bed may also include, for example, a superstructure, which includes a bed surface for supporting the patient. The chassis may be constructed, for example, of metal or composite materials and equipped with wheels to enable the patient bed's flexibility.

[0017] The chassis forms and / or includes a frame as the basic structure of the chassis and bears the total load of the patient bed. The chassis, and especially the frame, is preferably made of a stable, lightweight metal, such as aluminum or steel.

[0018] At least four, especially exactly four, wheels are arranged on the chassis. The wheels on the chassis preferably form driven rollers. The wheels may be pivotally constructed and / or arranged to enable steering, and are equipped with brakes to securely fix the bed. In particular, at least four wheels are not driven and / or do not have an active steering device and / or steering control device.

[0019] The patient bed, particularly the base and / or the space between the base and the superstructure, has a height adjustment device. This device allows the bed to be adjusted to a height suitable for support and patient comfort. This is particularly important for medical staff so they can work comfortably. The height adjustment device includes, for example, scissor ends, which are preferably adjustable by means of an electric actuator. The scissor ends may be supported on one side, for example, on the base and / or the substrate included therein, and on the superstructure on the other side.

[0020] The chassis and / or at least four wheels preferably include a braking system for at least four wheels. This ensures patient safety. The braking system is configured to lock at least one of the at least four wheels to prevent accidental movement of the bed.

[0021] The chassis's purpose is to make patient beds practical and flexible, facilitating patient transport within healthcare facilities. It can also be adapted to different medical applications and patient comfort levels.

[0022] The patient bed includes an attachment wheel assembly. The attachment wheel assembly includes at least one, and particularly exactly one, attachment wheel. The attachment wheel is particularly configured to be non-stealable, and the axle is, for example, non-pivotable. The attachment wheel can be configured as a driven and / or drivable wheel. Specifically, the attachment wheel can have a driven state and a non-driven state.

[0023] The additional wheel assembly includes a lifting module. The lifting module is particularly configured for lowering and / or raising at least one additional wheel. In the lowered state, the additional wheel is in contact with the ground, and / or the patient bed is in a supported state using the lowered additional wheel. The additional wheel can roll on the ground in the lowered state and / or in the supported state, and / or act as an actuator in the driven state. The additional wheel is in a raised state without ground contact, and / or the patient bed is in a unsupported state. Preferably, the additional wheel is not driven and / or can rotate freely in the raised state. Preferably, the patient bed, especially the upper structure, particularly includes handles, controls, such as switches or buttons, for moving the patient bed, wherein the control allows switching between the supported and unsupported states.

[0024] The lifting module includes a first lever unit and a second lever unit. The first and / or second lever units preferably each include lever sections, wherein the lever sections form an elongated, rigid body. The first and second lever units, especially the lever sections, preferably each include a connection point, wherein the connection point may also be configured as a rotation point and / or a pivot point. The connection points are particularly located at opposite ends of the lever units or lever sections. In particular, the lever units and / or lever sections are arranged in the same orientation relative to the longitudinal extension of the patient bed, utilizing their longitudinal extension.

[0025] The first and second lever sections are connected in a common intermediate section. In particular, the first and second lever units are connected at and / or by means of a connection point. For example, the two lever units are connected at the connection point by means of a connecting shaft. Preferably, the first and second lever units are rotatably and / or pivotally connected in the intermediate section.

[0026] The first lever unit is further connected to the chassis, particularly rotatably and / or pivotally. Preferably, the first lever unit is connected to the chassis at and / or via a connection point. The second lever unit is further connected to the chassis, particularly rotatably and / or pivotally. Preferably, the second lever unit is connected to the chassis at and / or via a connection point. In other words, the lever units are connected to the chassis and to other lever units, particularly pivotally. Preferably, the subsequent arrangement and / or connection is arranged in the longitudinal direction of the patient bed: the chassis is pivotally connected to the first lever unit, the first lever unit is pivotally connected to the second lever unit, and the second lever unit is pivotally connected to the chassis.

[0027] In particular, the attachment wheel is operatively connected to the first and / or second lever unit. Preferably, the attachment wheel is arranged, fixed, and / or connected to the first and / or second lever unit. The attachment wheel can be raised and / or lowered by means of the first and / or second lever unit about its connection to the chassis and / or pivoting in the intermediate region.

[0028] The second lever unit, alternatively and / or supplementarily, includes a compression spring in the first lever unit. The compression spring is configured and / or arranged to apply a compressive force to the ground onto the auxiliary wheel in the supported state and / or in the descending auxiliary wheel. In particular, the compression spring is configured to hold the auxiliary wheel in the descending state. Preferably, the compression spring is arranged around the lever section and / or between the two connection points. For example, the compression spring is a coil spring and / or a helical spring, wherein the lever section extends inside the spring. In other words, the spring can be wound around the lever section.

[0029] The arrangement of the compression spring within the lever unit plays a crucial role in the effective functioning of the mechanism. The compression spring is designed and positioned such that it applies precise compressive force to the auxiliary wheel as it descends. This compressive force is important for the ground adhesion of the auxiliary wheel and therefore for the stability and power of the entire unit.

[0030] The stiffness or spring constant of the compression spring is matched to the first and / or second lever unit, especially the length of the lever arm, thus enabling control over the force transmitted to the ground. This is particularly important when the additional wheel faces different ground conditions. The adaptability of the compression spring ensures optimal ground grip on smooth surfaces and uneven terrain.

[0031] Furthermore, the special design of the compression spring enables efficient energy transfer. Its elastic properties allow it to absorb impact loads and thus maintain a uniform compressive force acting on the auxiliary wheel. This is important not only for the lifespan of the components but also for the safe and frictionless operation of the entire lifting unit.

[0032] The compression spring is carefully designed with factors such as material strength, spring constant, and geometry in mind. This ensures optimal power and reliability of the second lever unit over extended periods.

[0033] Preferably, the compression spring is clamped between the two connection points. Alternatively and / or additionally, the compression spring is arranged around the lever section and clamped or supported between the connection section and the chassis.

[0034] Preferably, the intermediate section and / or lifting module includes a cam disk. The cam disk is connected to a cam disk drive shaft in a rotationally resistant manner. For example, the cam disk drive shaft may be threaded to the cam disk. The cam disk drive shaft is pivotally supported for pivoting the cam disk, and / or the cam disk may pivot and / or rotate about the cam disk drive shaft. The cam disk drive shaft is connected to the first or second lever unit in a loss-proof, force-locking, form-locking, friction-locking, and / or material-locking manner. For example, the cam disk drive shaft forms a metal and / or pin-shaped shaft, wherein the cam disk, the first and / or second lever unit respectively have a recess, a hole, and / or a drilled hole, wherein the cam disk drive shaft extends through the recess, hole, and / or drilled hole. The cam disk is supported on a support roller coupled to a chassis. The cam disk is configured to raise and / or lower an additional wheel by pivoting the cam disk about the cam disk drive shaft.

[0035] In particular, the cam disk forms an eccentric disk. The cam disk is preferably arranged and / or constructed such that, as the cam disk pivots about its drive shaft, the distance from the contact point between the cam disk and the support roller to the drive shaft or pivot point changes.

[0036] The cam disk preferably has a circular or elliptical shape. The cam disk is based on a solid material that is strong enough to bear the required load. Preferably, the cam disk is based on a metal, such as aluminum or steel.

[0037] Preferably, the geometric center of the cam disk does not coincide with the center of rotation or the point of rotation. In particular, the cam disk is configured to generate uneven rotation and / or pivoting about the cam disk drive shaft. The pivoting of the cam disk produces a change in the distance between the point of rotation and the eccentric point, which results in different speeds or movements.

[0038] To ensure stability during operation, the cam disc is supported on support rollers coupled to the chassis. These support rollers are positioned to absorb forces evenly and support the movement of the lifting module. Careful coordination of these components allows the cam disc to effectively and controllably raise or lower the auxiliary rollers.

[0039] Optionally, the lifting module and / or the additional wheel assembly are configured to shorten the lever length of the second lever unit and / or compress the compression spring when the additional wheel is raised, particularly during the associated pivoting of the second lever unit. For example, the second lever unit includes an elongated hole. The elongated hole forms and / or preferably includes a connection point. In other words, the second lever unit is pivotally connected to the chassis via the elongated hole. When the additional wheel is raised, the pivot axis of the connection between the second lever unit and the chassis moves closer to the connection point with the second lever unit. This proximity to the connection point results in a shortening of the lever arm, where the length of the lever arm can be understood here as the distance between the connection point of the second lever unit and the chassis and the first lever unit. By shortening the length of the lever arm or along the connection point of the lever segment, the compression spring arranged between the connection points and / or around the lever segment is compressed.

[0040] Optionally, the additional wheel assembly and / or lifting module includes a cam disk drive unit. The cam disk drive unit particularly includes and / or forms an electric motor. The cam disk drive unit is mechanically connected to the cam disk and / or cam disk drive shaft, particularly for transmitting the rotational motion and / or output torque of the cam disk drive unit. Preferably, the additional wheel assembly and / or lifting module includes a transmission device and / or a chute control device, wherein the connection between the cam disk drive unit and the cam disk and / or cam disk drive shaft is achieved through the transmission device and / or chute control device. The cam disk drive unit is configured to pivot the cam disk to raise and / or lower the additional wheel. With the aid of the cam disk drive unit, the additional wheel can be raised and / or lowered automatically and / or electrically. The cam disk drive unit can be operated, in particular, by a controller.

[0041] Optionally, the auxiliary wheel device and / or lifting module includes an auxiliary wheel drive unit. The auxiliary wheel drive unit particularly includes and / or forms an electric motor. The auxiliary wheel drive unit is mechanically connected to the auxiliary wheel, particularly for transmitting the rotational motion and / or output torque of the auxiliary wheel drive unit. For example, the auxiliary wheel drive unit includes a motor output shaft, wherein the auxiliary wheel drive unit is connected to the rotating shaft of the auxiliary wheel via a belt, particularly a toothed belt. The auxiliary wheel drive unit is configured to drive the auxiliary wheel. In particular, the auxiliary wheel drive unit is controllable and / or adjustable. For example, the auxiliary wheel drive unit can be controlled and / or adjusted by a controller.

[0042] Specifically, the second lever unit and / or compression spring are configured to pivot the auxiliary wheel by compressing the compression spring and / or shortening the lever length of the second lever unit when the auxiliary wheel crosses an obstacle. For this purpose, the second lever unit and the cam disc drive unit can be mechanically decoupled. For pivoting, the connection point of the second lever unit and the chassis can slide along an elongated hole.

[0043] The additional wheel assembly is arranged off-center in the transverse direction of the patient bed. In other words, the additional wheel assembly is located outside the center in the transverse direction, or offset to the left or right. In the longitudinal direction, the additional wheel assembly can be arranged in the center or not in the center. This arrangement of the additional wheel assembly allows for the minimum raising height or maximum lowering of the patient bed. Furthermore, the necessary structural space can be fully provided in the height adjustment mechanism of the patient bed.

[0044] Preferably, the additional wheel assembly includes two parallel walls in the lateral direction. The walls can be constructed continuously, preferably as metal walls. Alternatively, the walls can have recesses and / or be constructed as grid-like and / or frame-like. A sliding bearing unit for absorbing lateral forces is arranged between the walls. For example, the sliding bearing unit for absorbing lateral forces is a support design to cope with forces acting laterally or transversely to the axis of the support shaft. The sliding bearing unit includes, for example, a sliding bearing and a housing that supports and / or surrounds the bearing sleeve.

[0045] The additional wheel device is preferably constructed without a housing and / or exposed upwards without any covering. In other words, the components of the additional wheel device, particularly the first lever unit, the second lever unit, the cam disc, and / or the drive unit, are exposed upwards and / or without any covering. This allows for a particularly compact structure and space-saving arrangement and / or use of the additional wheel device. Furthermore, a particularly low descent of the patient bed can be achieved in the height adjustment device.

[0046] Optionally, the patient bed includes a control device. This control device is configured to control and / or adjust the auxiliary wheel drive unit and / or cam disc drive unit, and / or be connected to the auxiliary wheel drive unit and / or cam disc drive unit via signal technology. The control device is preferably configured for graded control and / or adjustment, and may be configured, for example, as a rotary adjuster, a sliding adjuster, buttons with different levels, a touchscreen interface, a digital control device, an operating element with multiple buttons, a selection switch, and / or a user graphical surface.

[0047] Optionally, the additional wheel has a rigid and / or non-pivotable axle in the horizontal plane. Attached Figure Description

[0048] Further advantages, functions, and / or design options are derived from the accompanying drawings and their description. Herein:

[0049] Figure 1 The patient's bed was shown;

[0050] Figure 2a , Figure 2b , Figure 2c A fragment of a patient bed, including its chassis, is shown.

[0051] Figure 3 An additional wheel device is shown;

[0052] Figure 4a , Figure 4b An auxiliary wheel device with a lowering / raising auxiliary wheel is shown;

[0053] Figure 5 An additional wheel assembly without electric support is shown. Detailed Implementation

[0054] Figure 1 A schematic diagram of an embodiment of a patient bed 1 is shown. The patient bed 1 is a flexible, movable bed having a bed surface 2 for supporting a patient. The bed surface 2 is part of the upper structure 3 of the patient bed. The patient bed 1 includes a base 4 and a central region 5 located below the bed surface 2. The central region 5 includes a height adjustment device, such as a scissor end, to adapt to the height of the upper structure 3 and / or the bed surface 2.

[0055] The patient bed 1 has four wheels 6, which are part of the chassis 4 and are not driven. These wheels 6 serve as driven rollers and are preferably arranged as rectangular or trapezoidal corners when viewed from below. Additionally, there is at least one driven auxiliary wheel 7 as part of an auxiliary wheel assembly 8, which can be in a lowered or raised state. A control device 9 (e.g., mounted on the handle 10 of the patient bed 1) is capable of controlling the state of the auxiliary wheel 7 and can also adjust the drive of the auxiliary wheel.

[0056] Figure 2a A top view of the exposed chassis 4 of the patient bed is shown. The chassis 4 forms a rectangular frame and has a longitudinal extension along the longitudinal direction L and a lateral extension along the transverse direction Q. The additional wheel assembly 8 includes a lifting module 11, wherein the lifting module 11 has a longitudinal extension greater than the lateral extension.

[0057] The lifting module 11 is pivotally connected to the chassis 4 at a first connection point P1 and a second connection point P2, wherein these connection points P1 and P2 are arranged along the longitudinal direction L. The off-center arrangement of the lifting module 11 in the lateral direction Q and the longitudinal direction L provides more structural space for the height-adjustable components.

[0058] The lifting module 11 consists of a first lever unit 12a and a second lever unit 12b arranged offset along the longitudinal direction L. The connection between the two lever units 12a and 12b occurs in the intermediate section 14, wherein the connection between the two lever units is pivotable and / or rotatable. A compression spring 13 extends between the second connection point P2 and the intermediate section 14. The second lever unit 12b has a lever section (also referred to as a lever arm), wherein the compression spring 13 is wound around the lever section.

[0059] Figure 2bA fragment of the patient bed 1 is shown in a side view. The additional wheel 7 is in the raised state, wherein, compared with the lowered state, the first lever unit 12a pivots about the first connection point P1, and the second lever unit 12b pivots about the second connection point P2.

[0060] The lifting module 11 includes a cam disk 17 located in and / or around the intermediate section 14. The cam disk 17 is preferably mechanically connected to the first lever unit 12a. The cam disk 17 forms an eccentric disk and / or moves via an eccentric actuator. The eccentric pivoting of the cam disk 17 can raise and lower the auxiliary wheel.

[0061] Figure 2c Shown in a side oblique view Figure 2a and Figure 2b The patient bed features two cam discs 17 arranged parallel to each other in the transverse direction. The cam discs 17 are supported on support rollers 18 connected to the chassis 4. The support rollers are arranged longitudinally L between connection points P1 and P2.

[0062] The chassis 4 has a first suspension 19a and a second suspension 19b, each suspension comprising two sidewalls along the lateral direction Q, through which pivot shafts A1 and A2 extend. A first lever unit 12a is connected to the chassis 4 on the first suspension 19a, and a second lever unit 12b is connected to the chassis 4 on the second suspension 19b.

[0063] Figure 3 An auxiliary wheel assembly 8 with auxiliary wheels 7 and a lifting module 11 is shown. A guide element 22, connected to the chassis 4, prevents the first lever unit 12a from lateral slippage in the transverse direction. The guide element has a long profile and is constructed of a stable material, such as metal, like steel or aluminum.

[0064] The auxiliary wheel drive unit 20 includes an electric motor 24 connected to a gear 27 via a transmission 25 and a belt 26, wherein the gear 27 is anti-rotatingly coupled to the axle A of the auxiliary wheel 7. R connect.

[0065] The cam disk drive unit 21 is not fully visible. The cam disk drive unit 21 includes a motor 28 for pivoting the cam disk. The coupling and / or connection of the cam disk drive unit 21 with the cam 17 and / or the cam disk drive shaft A3 is preferably achieved via a transmission device and / or a chute control device.

[0066] Figure 4a and Figure 4b The additional wheel unit 8 is shown in the descending additional wheel ( Figure 4a ) and raised additional wheels ( Figure 4b Changes when ) change between ).

[0067] Angles α and β, and distances l and d, are then considered. Angle α is the angle enclosed by the horizontal line h and the connecting line V1. The connecting line V1 is the line connecting point P and the wheel axle A. R The connection is as follows. To distinguish between the descending and ascending auxiliary wheels 7, α↓ represents the angle α in the descending auxiliary wheel, and α↑ represents the angle α in the ascending auxiliary wheel 7.

[0068] Angle β is the angle between the lever arm and / or lever segment of the second lever unit 12b and the vertical line V. To distinguish between the descending and ascending auxiliary wheel 7, angle β in the descending auxiliary wheel is represented by β↓, and angle β in the ascending auxiliary wheel 7 is represented by β↑.

[0069] The dimension l represents the effective lever length of the second lever unit. In other words, l represents the distance between axes A2 and A3. To distinguish between the descending and ascending auxiliary wheels 7, l↓ represents the distance l in the descending auxiliary wheel, and l↑ represents the distance l in the ascending auxiliary wheel 7.

[0070] The dimension d describes the distance between the support roller 18 and the cam disc drive shaft A3. To distinguish between the descending and ascending auxiliary rollers 7, d↓ represents the distance d in the descending auxiliary roller, and d↑ represents the distance d in the ascending auxiliary roller 7.

[0071] For the states of the additional wheel 7 in both the rising and falling positions, the dimensions l, d, α, and β are different. In the rising state, the length l↑ is less than l↓ in the falling state, and the distance d↑ is greater than l↓. For the angles α and β, α↑ is greater than α↓ (where angles above the horizontal line are positive and angles below the horizontal line are negative), and β↑ is greater than β↓.

[0072] Figure 5 An embodiment of a non-electric auxiliary wheel device 8 is shown. The auxiliary wheel device 8 is essentially as follows: Figure 3 The additional wheel device 8 is constructed in the same way as the electric transformation scheme, but unlike the electric transformation scheme, the electric motor or additional wheel drive unit 20 and the cam disk drive unit 21 are omitted. Furthermore, the transmission device 25, belt 26, and gear 27 required in the electric transformation scheme are omitted. Additionally, in... Figure 5 In the non-electric variant, the cam disc 17 is not necessary and is not included. Instead of the support roller 18 provided in the electric variant, the stop bracket (Anschlagwinkel) is located at this location in the non-electric variant.

Claims

1. A patient bed (1) having a chassis (4), at least four wheels (6) arranged on said chassis (4), and an additional wheel assembly (8), characterized in that, in, The additional wheel device (8) includes at least one additional wheel (7) and a lifting module (11). The lifting module (11) has a first lever unit (12a) and a second lever unit (12b), wherein the first lever unit (12a) and the second lever unit (12b) are connected in action in the middle section (14), and the additional wheel (7) is connected to the first lever unit (12a). The additional wheel device (8) is pivotally connected to the chassis (4) at the first end of the first lever unit (12a), and pivotally connected to the chassis (4) at the second end of the second lever unit (12b) along the longitudinal direction (L) of the patient bed (1). The lifting module (11) is configured to raise and / or lower the additional wheel (7) by means of the pivoting of the first lever unit (12a) and / or the second lever unit (12b).

2. The patient bed (1) according to claim 1, characterized in that, The second lever unit (12b) includes a compression spring (13), wherein the compression spring (13) is configured and / or arranged to apply a compressive force to the ground acting on the descending additional wheel (7).

3. The patient bed according to claim 1 or 2, characterized in that, It has a cam disk (17), wherein the cam disk (17) is connected to a cam disk drive shaft (A3) in a rotationally resistant manner, wherein the cam disk drive shaft (A3) is pivotally supported for pivoting the cam disk (17), wherein the cam disk drive shaft (A3) is connected to the first lever unit (12a) or the second lever unit (12b) in a loss-proof manner, wherein the cam disk (17) is supported on a support roller (18) coupled to the chassis (4), wherein the cam disk (17) is configured to raise and / or lower the additional wheel (7) by means of its pivoting and support on the support roller (18).

4. The patient bed (1) according to claim 2, characterized in that, The lifting module (11) and / or the additional wheel device (8) are configured to shorten the lever length of the second lever unit (12b) and / or compress the compression spring (13) when the second lever unit (12b) pivots in order to raise the additional wheel (7).

5. The patient bed (1) according to claim 3, characterized in that, It has a cam disk drive unit (21), wherein the cam disk drive unit (21) is operatively connected to the cam disk drive shaft (A3) and is configured to pivot the cam disk (17) for raising and / or lowering the additional wheel (7).

6. The patient bed (1) according to claim 1 or 2, characterized in that, It has an additional wheel drive unit (20), wherein the additional wheel drive unit (20) and the wheel axle (A) of the additional wheel (7) are connected. R The function connects and is constructed to drive the additional wheel (7).

7. The patient bed (1) according to claim 2, characterized in that, The second lever unit (12b) and / or the compression spring (13) are configured to pivot the additional wheel (7) by compression of the compression spring (13) and / or shortening of the lever length of the second lever unit (12b) when the additional wheel (7) passes over an obstacle.

8. The patient bed (1) according to claim 1 or 2, characterized in that, The additional wheel device (8) is arranged off-center in the transverse direction (Q) of the patient bed (1).

9. The patient bed (1) according to claim 1 or 2, characterized in that, The additional wheel device (8) includes two parallel walls in the lateral direction (Q), wherein a sliding bearing unit is arranged between the walls to absorb lateral forces.

10. The patient bed (1) according to claim 1 or 2, characterized in that, The additional wheel device (8) is constructed without a housing and / or is constructed with the upper part uncovered.

11. The patient bed (1) according to claim 6, characterized in that, It has a control device (9), wherein the control device (9) is configured to control and / or adjust the additional wheel drive unit (20), and / or be connected to the additional wheel drive unit by signal technology.

12. The patient bed (1) according to claim 5, characterized in that, It has a control device (9), wherein the control device (9) is configured to control and / or adjust the cam disk drive unit (21), and / or be connected to the cam disk drive unit by signal technology.

13. The patient bed (1) according to claim 1 or 2, characterized in that, The additional wheel (7) has a rigid and / or non-pivotable axle (A) in the horizontal plane. R ).

14. The patient bed (1) according to claim 3, characterized in that, The cam disk (17) is arranged in the intermediate section (14).

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