Lifting trundle and bed thereof

Abstract

The utility model provides a lifting caster and a bed thereof, the lifting caster comprises a lifting caster device mounted at the bottom of a bed frame, the lifting caster device comprises a fixed frame and two groups of lifting caster driving mechanisms, the fixed frame is arranged below the bed frame in parallel, and supporting legs are fixedly mounted at the bottom of the fixed frame; the two groups of lifting trundle driving mechanisms are mounted between the fixed frame and the bed frame, are respectively distributed close to the two ends of the bed frame, and can drive the bottoms of the walking wheels to be lower than or higher than the bottoms of the supporting legs. According to the lifting trundle, the walking wheel is controlled to ascend and descend through the driving element (the electric push rod / the hydraulic cylinder), the supporting feet have the supporting function and the braking function (no additional braking device is needed), the structure is simplified, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of caster technology, specifically to a lifting caster and its bed. Background Technology

[0002] Casters are a general term encompassing swivel casters, fixed casters, and swivel casters with brakes. Swivel casters, also known as universal wheels, allow 360-degree rotation; fixed casters, also called directional casters, lack a rotating mechanism and cannot turn. Typically, these two types are used together; for example, a handcart typically has two fixed casters at the front and two swivel casters near the push handle at the rear. Casters are made from various materials, such as PP casters, PVC casters, PU casters, cast iron casters, nylon casters, TPR casters, iron-core nylon casters, and iron-core PU casters.

[0003] Currently, the casters of mobile beds have the following defects:

[0004] 1. Reliance on manual braking: Requires manual operation of an independent braking mechanism, which is cumbersome;

[0005] 2. Complex structure: Independent braking devices increase the number of parts and maintenance costs.

[0006] Therefore, a lifting caster and its bed are proposed. Utility Model Content

[0007] The present invention aims to solve the problems mentioned in the background art by providing a lifting caster and a bed thereof.

[0008] The specific technical solution is as follows:

[0009] A type of adjustable caster includes an adjustable caster device installed at the bottom of a bed frame. The adjustable caster device includes a fixed frame and two sets of adjustable caster drive mechanisms, wherein:

[0010] The fixing frame is arranged parallel to the bottom of the bed frame, and the bottom of the fixing frame is fixedly installed with a support leg;

[0011] Both sets of the lifting caster drive mechanisms are installed between the fixed frame and the bed frame, and the two sets of lifting caster drive mechanisms are distributed close to both ends of the bed frame. The lifting caster drive mechanism can drive the bottom of the walking wheel to be lower or higher than the bottom of the support leg.

[0012] The aforementioned lifting casters, wherein each set of lifting caster drive mechanisms includes a connecting rod, a slide rail, an H-shaped connecting arm, an H-shaped connecting frame, and a drive element. The connecting rods of both sets of lifting caster drive mechanisms are respectively fixedly installed at the bottom ends of the bed frame. The slide rails of both sets of lifting caster drive mechanisms are respectively fixedly installed on both sides of the bottom middle section of the bed frame. The upper ends of the H-shaped connecting arms of both sets of lifting caster drive mechanisms are slidably connected to the two slide rails respectively. The bottom end of one set of H-shaped connecting arms is hinged to one end of the fixed frame. On the inner side, the bottom end of another set of H-shaped connecting arms is slidably mounted on the other end of the fixed frame. One end of the H-shaped connecting frame in the same set of lifting caster drive mechanisms is hinged to the middle of the H-shaped connecting arm, and the other end is hinged to the connecting rod. Each H-shaped connecting arm is fixedly mounted with a traveling wheel near its bottom end on both sides. One end of the drive element in the same set of lifting caster drive mechanisms is hinged to the bottom of the bed frame, and the other end is hinged to a connecting seat. The connecting seat is fixedly connected to the middle of the H-shaped connecting frame at the corresponding position.

[0013] In the aforementioned lifting casters, the upper end of the H-shaped connecting arm in both sets of lifting caster drive mechanisms is rotatably mounted with a sliding component via a connecting shaft, and the sliding component is slidably mounted within the slide rail.

[0014] In the aforementioned lifting casters, the bottom end of the H-shaped connecting arm, which is slidably mounted to the fixed frame, is rotatably mounted with a second sliding member via a second connecting shaft. The second sliding member is slidably mounted inside the guide rail, and the guide rail is fixedly mounted inside the fixed frame.

[0015] In the aforementioned lifting casters, both the second sliding member and the first sliding member are rollers, sliders, or rolling bearings.

[0016] The aforementioned lifting casters include: a T-shaped reinforcing frame fixedly installed on the inner side of each H-shaped connecting frame.

[0017] In the aforementioned lifting casters, the driving element is an electric push rod or a hydraulic cylinder.

[0018] This utility model also provides a bed, including the aforementioned adjustable casters.

[0019] This utility model has the following beneficial effects:

[0020] Automatic switching between outriggers and wheels: The lifting and lowering of the wheels is controlled by a drive element (electric push rod / hydraulic cylinder), and the outriggers serve as both support and brakes (no additional braking device is required), simplifying the structure and reducing costs.

[0021] Dual-side synchronous drive: Two sets of lifting caster drive mechanisms are symmetrically distributed at both ends of the bed frame. The "fixed at both ends + guided in the middle" layout (connecting rod and slide rail cooperate) ensures the synchronization of movement and avoids the bed tilting. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of the lifting casters provided in this embodiment of the utility model. Figure 1 ;

[0023] Figure 2 A schematic diagram of the structure of the lifting casters provided in this embodiment of the utility model. Figure 2 ;

[0024] Figure 3 A schematic diagram of the structure of the lifting casters provided in this embodiment of the utility model. Figure 3 ;

[0025] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0026] Figure 5 This is a schematic diagram showing the movable state of the lifting casters provided in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram showing the state of the lifting caster when it is immovable, as provided in an embodiment of the present utility model.

[0028] Figure 7 A schematic diagram of the structure of the lifting casters provided in this embodiment of the utility model. Figure 4 ;

[0029] Figure 8 A schematic diagram of the structure of the lifting casters provided in this embodiment of the utility model. Figure 5 .

[0030] In the attached image:

[0031] 1. Bed frame; 2. Fixed frame; 3. Connecting rod; 4. H-shaped connecting frame; 5. H-shaped connecting arm; 6. Slide rail; 7. Connecting shaft one; 8. Drive element; 9. Connecting seat; 10. T-shaped reinforcing frame; 11. Support leg; 12. Traveling wheel; 13. Sliding part one; 14. Sliding part two; 15. Guide rail; 16. Connecting shaft two. Detailed Implementation

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Example

[0037] The lifting casters provided in this embodiment, such as Figures 1-8 As shown, it includes: a lifting caster device installed at the bottom of the bed frame 1, the lifting caster device including a fixed frame 2 and two sets of lifting caster drive mechanisms.

[0038] Among them, the fixing frame 2 is arranged parallel to the bottom of the bed frame 1, and the bottom of the fixing frame 2 is fixedly installed with the support leg 11;

[0039] Both sets of lifting caster drive mechanisms are installed between the fixed frame 2 and the bed frame 1, and the two sets of lifting caster drive mechanisms are distributed close to both ends of the bed frame 1. The lifting caster drive mechanism can drive the bottom of the walking wheel 12 to be lower or higher than the bottom of the support leg 11.

[0040] The lifting caster using the above technical solution mainly consists of a fixed frame 2 and two sets of lifting caster drive mechanisms. The lifting caster drive mechanism can drive the bottom of the traveling wheel 12 to be lower or higher than the bottom of the support leg 11. When the bottom of the traveling wheel 12 is lower than the bottom of the support leg 11, the support leg 11 is off the ground and the whole can move freely. When the bottom of the traveling wheel 12 is higher than the bottom of the support leg 11, the support leg 11 contacts the ground. At this time, the support leg 11 has both a supporting function and a braking function, eliminating the cumbersome steps of braking and saving the braking device, which can reduce production costs.

[0041] Each set of lifting caster drive mechanisms includes a connecting rod 3, a slide rail 6, an H-shaped connecting arm 5, an H-shaped connecting frame 4, and a drive element 8. The connecting rod 3 in both sets of lifting caster drive mechanisms is fixedly installed at the bottom of both ends of the bed frame 1. The slide rail 6 in both sets of lifting caster drive mechanisms is fixedly installed on both sides of the bottom middle part of the bed frame 1. The upper ends of the H-shaped connecting arms 5 in both sets of lifting caster drive mechanisms are slidably connected to the two slide rails 6 respectively. The bottom end of one set of H-shaped connecting arms 5 is hinged to one end of the fixed frame 2. On the side, the bottom end of another set of H-shaped connecting arms 5 is slidably installed on the other end of the fixed frame 2. One end of the H-shaped connecting frame 4 in the same set of lifting caster drive mechanism is hinged to the middle of the H-shaped connecting arm 5, and the other end is hinged to the connecting rod 3. Each H-shaped connecting arm 5 is fixedly installed with a traveling wheel 12 near the two sides of its bottom end. One end of the drive element 8 in the same set of lifting caster drive mechanism is hinged to the bottom of the bed frame 1, and the other end is hinged to a connecting seat 9. The connecting seat 9 is fixedly connected to the middle of the H-shaped connecting frame 4 at the corresponding position.

[0042] Connecting rods 3 are fixed to the bottom of both ends of bed frame 1, and slide rails 6 are installed on both sides of the middle of bed frame 1, forming a symmetrical structure of "fixed at both ends + guided in the middle". This layout ensures the synchronous movement of the two sets of drive mechanisms, avoids bed tilting caused by uneven force on one side, and enhances overall rigidity;

[0043] The upper end of the H-shaped connecting arm 5 is slidably connected to the slide rail 6, and the lower end adopts a hybrid connection method of "one end hinged + one end sliding" (one set is hinged to the fixed frame 2, and the other set is slidably installed). This design allows the drive mechanism to adaptively adjust the angle and displacement during the lifting process, ensuring both freedom of movement and avoiding structural interference, significantly improving the smoothness of the lifting action;

[0044] One end of the H-shaped connecting frame 4 is hinged to the middle of the H-shaped connecting arm 5, and the other end is hinged to the connecting rod 3, forming a lever-like structure. When the driving element 8 (such as an electric push rod) pushes the connecting seat 9, the driving force is converted into the lifting torque of the H-shaped connecting arm 5 through the H-shaped connecting frame 4, amplifying the effect and reducing the demand on the output force of the driving element. This allows for the use of a miniaturized, low-power driving device, saving energy and cost.

[0045] One end of the drive element 8 is hinged to the bottom of the bed frame 1, and the other end is fixed to the middle of the H-shaped connecting frame 4 via the connecting seat 9. This double-hinged design allows the drive element 8 to freely adjust its angle during extension and retraction, avoiding the accumulation of internal stress caused by the mismatch between linear and rotational motion, and extending the life of the drive element.

[0046] Each H-shaped connecting arm 5 has two traveling wheels 12 installed on both sides of its bottom end, forming symmetrical support points. During lifting, the traveling wheels on both sides simultaneously contact or detach from the ground, ensuring even force distribution when the bed moves, avoiding wear or slippage on one side, and is especially suitable for stable movement on uneven ground;

[0047] The H-shaped connecting arm 5 and H-shaped connecting frame 4 adopt an H-shaped cross-section design, which reduces material usage while ensuring bending and torsional strength, thus achieving lightweighting. In addition, the open space of the H-shaped structure facilitates the integrated installation of other components (such as drive elements and connecting seats), optimizing the overall layout.

[0048] Quickly switch between support and movement modes

[0049] Automatic switching between support leg 11 and running wheel 12:

[0050] When the drive element 8 retracts, the traveling wheels 12 descend below the support legs 11, the support legs leave the ground, and the bed can move freely; when the drive element 8 extends, the traveling wheels 12 rise, the support legs 11 contact the ground, and automatic braking is achieved through the friction between the support legs and the ground.

[0051] No additional braking device:

[0052] The 11-leg design combines support and braking functions, eliminating the need for a separate braking mechanism required by traditional casters, simplifying the structure, and reducing failure rate and maintenance costs.

[0053] In the two sets of lifting caster drive mechanisms, the upper end of the H-shaped connecting arm 5 is rotatably mounted with a sliding component 13 via a connecting shaft 7, and the sliding component 13 is slidably mounted in the slide rail 6.

[0054] The design of the connecting shaft 7 and the sliding component 13 ensures that the H-shaped connecting arm 5 has flexibility and guidance when sliding in the slide rail 6, reduces motion resistance, avoids jamming caused by friction during lifting, and enhances the stability of the overall structure to prevent lateral deviation.

[0055] Among them, the bottom end of the H-shaped connecting arm 5, which is slidably installed with the fixed frame 2, is rotatably installed with a sliding component 14 via a connecting shaft 16. The sliding component 14 is slidably installed in the guide rail 15, and the guide rail 15 is fixedly installed on the inner side of the fixed frame 2.

[0056] By sliding the guide rail 15 and the sliding component 14, the bottom end of the H-shaped connecting arm 5 is accurately guided within the fixed frame 2, dispersing the longitudinal load during the lifting action, reducing stress concentration at the hinge point, extending the service life of the component, and ensuring that the two sets of drive mechanisms move synchronously.

[0057] Among them, both sliding component 2 14 and sliding component 13 are rollers, sliders, or rolling bearings. The selection of rollers, sliders, or rolling bearings can be flexibly adapted according to actual load requirements.

[0058] Rollers: Suitable for light-load scenarios, with low rolling friction coefficient and smooth movement;

[0059] Slider: Simple structure, low cost, and easy to maintain;

[0060] Rolling bearings: strong load-bearing capacity, high wear resistance, suitable for high-frequency lifting operations.

[0061] Each H-shaped connecting frame 4 has a T-shaped reinforcing frame 10 fixedly installed on its inner side. The T-shaped reinforcing frame 10 increases the moment of inertia of the H-shaped connecting frame 4, which significantly improves its bending stiffness and prevents plastic deformation when the driving element 8 applies force. This ensures the accuracy of the lifting action and the durability of the structure, and is especially suitable for heavy-duty medical beds or industrial equipment.

[0062] Among them, the driving element 8 is an electric push rod or a hydraulic cylinder.

[0063] Electric linear actuator: Provides precise linear displacement control with low noise, making it suitable for medical scenarios requiring quiet operation;

[0064] Hydraulic cylinders: high output force, fast response speed, suitable for heavy industrial equipment.

[0065] The choice of two drive methods expands the application range of the device, while the modular design reduces the cost of modification.

[0066] In summary, the lifting casters provided in this embodiment have the following advantages:

[0067] 1. Function integration and stability improvement

[0068] Automatic switching between outrigger 11 and traveling wheel 12: The lifting and lowering of the traveling wheel 12 is controlled by the drive element 8 (electric push rod / hydraulic cylinder), and the outrigger 11 has both support and braking functions (no additional braking device is required), which simplifies the structure and reduces costs.

[0069] Dual-side synchronous drive: Two sets of lifting caster drive mechanisms are symmetrically distributed at both ends of the bed frame 1. The "fixed at both ends + guided in the middle" layout (connecting rod 3 cooperates with slide rail 6) ensures the synchronization of movement and avoids the bed tilting.

[0070] 2. Structural lightweighting and strength optimization

[0071] H-shaped connecting arm 5 and H-shaped connecting frame 4: They adopt an H-shaped cross-section design, which reduces the amount of material used while ensuring bending and torsional strength, and further enhances rigidity through T-shaped reinforcing frame 10, making them suitable for heavy-duty scenarios (such as medical beds).

[0072] Sliding guide design: Sliding component 13 (roller / slider / rolling bearing) moves along slide rail 6, and sliding component 2 14 slides along guide rail 15, reducing frictional resistance and local stress, and extending service life.

[0073] 3. Power transmission efficiency and adaptability

[0074] Lever transmission mechanism: The H-shaped connecting frame 4 converts the thrust of the driving element 8 into the lifting torque of the H-shaped connecting arm 5, amplifying the effect and reducing the power requirement of the driving element.

[0075] Modular drive selection: Electric linear actuators (for quiet medical scenarios) and hydraulic cylinders (for heavy-duty industrial applications) are compatible with each other to meet different application requirements.

[0076] Workflow

[0077] 1. Movement Mode:

[0078] Drive retraction: The drive element 8 (such as an electric push rod) retracts, pulling the H-shaped connecting frame 4 through the connecting seat 9, driving the H-shaped connecting arm 5 to move down along the slide rail 6, the bottom of the traveling wheel 12 descends below the support leg 11, the support leg 11 is lifted off the ground, and the bed can move freely.

[0079] Double-sided synchronous support: The walking wheels 12 are symmetrically installed on both sides of the bottom end of the H-shaped connecting arm 5 to ensure uniform force during movement.

[0080] 2. Fixed mode:

[0081] Drive extension: The drive element 8 extends, pushing the H-shaped connecting frame 4, causing the H-shaped connecting arm 5 to move upward, the walking wheel 12 to rise, and the support leg 11 to contact the ground.

[0082] Automatic braking: The friction between the outrigger 11 and the ground enables self-locking, eliminating the need for an additional braking device.

[0083] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A type of lifting caster, characterized in that, Includes a lifting caster device installed at the bottom of the bed frame (1), the lifting caster device including a fixed frame (2) and two sets of lifting caster drive mechanisms, wherein: The fixing frame (2) is arranged parallel to the bottom of the bed frame (1), and the bottom of the fixing frame (2) is fixedly installed with a support leg (11); Both sets of the lifting caster drive mechanisms are installed between the fixed frame (2) and the bed frame (1), and the two sets of lifting caster drive mechanisms are distributed close to both ends of the bed frame (1). The lifting caster drive mechanism can drive the bottom of the walking wheel (12) to be lower or higher than the bottom of the support leg (11).

2. The lifting caster according to claim 1, characterized in that, Each set of lifting caster drive mechanisms includes a connecting rod (3), a slide rail (6), an H-shaped connecting arm (5), an H-shaped connecting frame (4), and a drive element (8). The connecting rods (3) in both sets of lifting caster drive mechanisms are fixedly installed at the bottom of both ends of the bed frame (1). The slide rails (6) in both sets of lifting caster drive mechanisms are fixedly installed on both sides of the bottom middle part of the bed frame (1). The upper ends of the H-shaped connecting arms (5) in both sets of lifting caster drive mechanisms are slidably connected to the two slide rails (6). The bottom end of one set of H-shaped connecting arms (5) is hinged to the inner side of one end of the fixed frame (2). The bottom end of another set of H-shaped connecting arms (5) is slidably installed on the other end of the fixed frame (2). One end of the H-shaped connecting frame (4) in the same set of lifting caster drive mechanism is hinged to the middle of the H-shaped connecting arm (5), and the other end is hinged to the connecting rod (3). Each H-shaped connecting arm (5) is fixedly installed with a walking wheel (12) near the two sides of its bottom end. One end of the driving element (8) in the same set of lifting caster drive mechanism is hinged to the bottom of the bed frame (1), and the other end is hinged to a connecting seat (9). The connecting seat (9) is fixedly connected to the middle of the H-shaped connecting frame (4) at the corresponding position.

3. The lifting caster according to claim 2, characterized in that, The upper end of the H-shaped connecting arm (5) in both sets of lifting caster drive mechanisms is rotatably mounted with a sliding member (13) via a connecting shaft (7), and the sliding member (13) is slidably mounted in the slide rail (6).

4. The lifting caster according to claim 3, characterized in that, The bottom end of the H-shaped connecting arm (5), which is slidably mounted to the fixed frame (2), is rotatably mounted with a sliding member (14) via a connecting shaft (16). The sliding member (14) is slidably mounted inside the guide rail (15), which is fixedly mounted on the inner side of the fixed frame (2).

5. The lifting caster according to claim 4, characterized in that, Both the second sliding member (14) and the first sliding member (13) are rollers, sliders, or rolling bearings.

6. The lifting caster according to claim 2, characterized in that, A T-shaped reinforcing frame (10) is fixedly installed on the inner side of each of the H-shaped connecting frames (4).

7. The lifting caster according to claim 2, characterized in that, The driving element (8) is an electric push rod or a hydraulic cylinder.

8. A bed, characterized in that, Includes the lifting casters as described in any one of claims 1-7.

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