Adjustable virtual center rotating device

Abstract

The utility model relates to the technical field of movement mechanism design, and provides an adjustable virtual center rotating device which comprises a rack, a movable part, an overturning unit and an adjusting unit. The movable part is arranged on the rack. The overturning unit is connected with the movable part so as to drive the movable part to overturn. The adjusting unit is arranged on the rack, a moving seat is arranged on the adjusting unit, the adjusting unit is configured to be capable of driving the moving seat to move in at least one direction, and the moving seat is connected with the overturning unit so as to adjust the overturning center position of the overturning unit. Through the synergistic effect of the overturning unit and the adjusting unit, the rotation center of the movable part can be accurately adjusted, so that the rotation center of the movable part is kept consistent with the body rotation centers of different users. The problem that a traditional nursing bed is poor in adaptability due to the fact that the rotation center is fixed is effectively solved, and personalized nursing is provided for users of different heights and body types. The application range of the nursing bed is greatly widened, and a user who is tall or short can have comfortable back lifting experience.

Description

Technical Field

[0001] This utility model relates to the field of motion mechanism design technology, and in particular to an adjustable virtual center rotation device. Background Technology

[0002] Medical care and nursing for the elderly, especially those with mobility issues and lower limb disabilities, has become a pressing social problem. Currently, the design of devices to address these issues is a hot research topic, with nursing beds, as a type of assistive medical device, gaining increasing popularity among the elderly and disabled. However, most hospitals, nursing homes, and homes in China still use traditional hand-cranked nursing beds. Although service devices designed for the disabled exist in China, their development is hampered by technological limitations and high prices.

[0003] Traditional nursing beds have a fixed center of rotation for the backrest, resulting in inconsistencies in the horizontal rotation center when used by individuals of different heights and body structures. Taller individuals experience a larger gap between their buttocks and the backrest, increasing pressure on their lower back and potentially causing discomfort over time. Shorter individuals, whose heads are initially positioned at the head of the bed, tend to slide downwards during the backrest adjustment, pulling on their clothing and making it difficult to return to the starting position. Furthermore, variations in mattress thickness (whether underweight or overweight, or depending on the season) can exacerbate the back-pulling effect during backrest adjustments, increasing pressure on the lower back and potentially leading to long-term health risks. Many sports facilities require a virtual, adjustable center of rotation. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to propose an adjustable virtual center rotation device with an adjustable rotation center.

[0005] To achieve the above and other related objectives, this utility model provides an adjustable virtual center rotation device, comprising:

[0006] frame;

[0007] The movable component is mounted on the frame;

[0008] A flipping unit is connected to the movable component to drive the movable component to flip.

[0009] An adjustment unit is disposed on the frame, and a movable seat is disposed on the adjustment unit. The adjustment unit is configured to drive the movable seat to move in at least one direction. The movable seat is connected to the flipping unit to adjust the flipping center position of the flipping unit.

[0010] In an optional embodiment of this utility model, the flipping unit includes a linear drive unit and a linkage unit. The two ends of the linear drive unit are hinged to the movable part and the frame / moving seat to drive the movable part to flip, or the two ends of the linear drive unit are hinged to the frame / moving seat and the linkage unit to drive the movable part to flip.

[0011] In an optional embodiment of this utility model, the linkage unit is connected to the movable seat and the movable component respectively.

[0012] In an optional embodiment of this utility model, the movable component is provided with two sets of linear drive structures, and the linkage unit is connected to the moving end of the two sets of linear drive structures and the moving seat, respectively.

[0013] In an optional embodiment of this utility model, the moving direction of the linear drive structure is in the vertical plane of the flipping center axis.

[0014] In an optional embodiment of this utility model, the linkage unit includes two sets of first linkages, second linkages and third linkages. The first linkages are respectively hinged to the movable seat and the third linkage, the second linkages are respectively hinged to the movable seat and the third linkage, and the extension ends of the two sets of third linkages are respectively hinged to the moving ends of the two sets of linear drive structures.

[0015] In an optional embodiment of this utility model, the first link, the second link, the third link, and the movable seat are arranged to form a parallelogram mechanism.

[0016] In an optional embodiment of this utility model, the adjustment unit includes a first linear adjustment device and a second linear adjustment device. The second linear adjustment device is disposed at the moving end of the first linear adjustment device, and the moving seat is disposed at the moving end of the second linear adjustment device. The adjustment direction of the first linear adjustment device is a first direction, and the adjustment direction of the second linear adjustment device is a second direction. The first direction and the second direction do not coincide.

[0017] In an optional embodiment of this utility model, the first direction is the length direction of the frame, and the second direction is the vertical direction.

[0018] In an optional embodiment of this utility model, the flipping unit and the adjusting unit are disposed on the lower side of the frame.

[0019] The technical advantages of this invention are as follows: This invention proposes an adjustable virtual center rotation device. Through the coordinated action of the flipping unit and the adjustment unit, the rotation center of the moving parts can be precisely adjusted to match the rotation center of different users' bodies. This effectively solves the problem of poor adaptability caused by the fixed rotation center of traditional nursing beds, providing personalized care for users of different heights and body types. It greatly improves the applicability of the nursing bed, allowing users of all heights and builds to enjoy a comfortable backrest experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the adjustable virtual center rotation device in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the adjustable virtual center rotation device in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the adjustable virtual center rotation device in one embodiment of the present invention;

[0024] Figure 4 This is a structural schematic diagram from another perspective of the adjustable virtual center rotation device in one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 10. Frame; 11. Moving part; 20. Linear drive unit; 30. Adjustment unit; 31. First linear adjustment device; 32. Second linear adjustment device; 33. Moving seat; 40. Linkage unit; 41. First link; 42. Second link; 43. Third link; 50. Linear drive structure; 51. Slide rail; 52. Slider; 53. Drive component; 60. Flip center. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] Currently, most nursing beds widely used in China are traditional hand-cranked nursing beds. While these beds meet basic nursing needs to a certain extent, they are functionally limited, inconvenient to adjust, and have many technical limitations, especially in their backrest lifting function. The backrest of traditional nursing beds is usually designed with a fixed center of rotation, making it difficult to accommodate users of different heights, body types, and weights, leading to the following problems:

[0029] When the user's center of gravity is not aligned with the center of rotation, the center of rotation of the nursing bed remains fixed and cannot be adjusted according to the user's height, body type, or mattress thickness. For taller users, this mismatch between the center of rotation and the center of gravity creates a larger gap between the buttocks and the backrest, increasing pressure on the lower back and potentially leading to discomfort or even injury with prolonged use.

[0030] Sliding and clothing pulling issues. Shorter users, when sitting up, often experience a slippage as their head is close to the headboard, causing their back clothing to be pulled. This affects comfort and increases the difficulty of care. This slippage is particularly noticeable in different seasons and with varying mattress thickness, further exacerbating the inconvenience.

[0031] Uneven pressure on the lower back can occur when users of different body types experience varying degrees of pressure distribution during back extension exercises. For those who are underweight or overweight, insufficient contact between the lower back and the bed surface increases the burden on the lower back during these exercises, potentially leading to lumbar muscle strain with prolonged use. Furthermore, variations in mattress thickness can alter the contact area between the body and the bed, further impacting the effectiveness of back extension exercises.

[0032] Traditional nursing beds often suffer from difficulty in aligning the head with the headboard during use, especially when the user is transitioning from a reclining position to a supine position. This not only affects comfort but can also lead to a risk of falls due to improper positioning.

[0033] Against this backdrop, the market has placed higher demands on more humanized and intelligent nursing beds. In recent years, although some progress has been made in the field of intelligent nursing beds both domestically and internationally, the adoption rate remains low due to high technological barriers and expensive equipment. This necessitates the development of nursing beds with adjustable virtual rotation centers to meet the personalized needs of different groups.

[0034] Therefore, developing a nursing bed with an adjustable virtual rotation center is of great significance for improving the quality of life for the elderly and disabled. This technological breakthrough will effectively solve many problems associated with traditional nursing beds, providing a more scientific, convenient, and efficient solution for medical care.

[0035] The driving mechanism for linear movement in this application can be a lead screw and nut, a cylinder, a hydraulic cylinder, a gear and rack, or other similar devices.

[0036] like Figure 1-4 As shown, this utility model provides an adjustable virtual center rotation device, including a frame 10, a movable component 11, a flipping unit, and an adjustment unit 30. The adjustable virtual center rotation device is applied to a nursing bed, wherein the frame 10 corresponds to the bed frame, and the movable component 11 corresponds to the backrest.

[0037] The movable part 11 is disposed on the frame 10.

[0038] The flipping unit is connected to the movable part 11 to drive the movable part 11 to flip. The flipping unit directly drives the movable part 11 to flip, and the dynamic adjustment of the flipping center 60 further optimizes the motion trajectory. Specifically, the flipping unit can be an electric push rod type flipping unit, a hydraulic drive type flipping unit, a mechanical gear and rack type flipping unit, a linkage mechanism type flipping unit, a rope pulley type flipping unit, a ball screw type flipping unit, an eccentric wheel drive type flipping unit, a magnetic drive type flipping unit, etc.

[0039] An adjustment unit 30 is mounted on the frame 10. A movable seat 33 is mounted on the adjustment unit 30. The adjustment unit 30 is configured to drive the movable seat 33 to move in at least one direction. The movable seat 33 is connected to the flipping unit to adjust the position of the flipping center 60 of the flipping unit. Through the movable seat 33 in the adjustment unit 30, the flipping unit can be precisely moved in at least one direction, thereby dynamically adjusting the position of the flipping center 60 of the movable part 11. This solves the limitation of traditional fixed flipping centers 60, which are difficult to adapt to users of different heights and body types. It achieves precise matching between the flipping trajectory of the movable part 11 and the movement of the human back, avoiding slippage and friction. It improves the applicability of the adjustable virtual center rotation device, making it suitable for a wide range of users, including children, adults, and the elderly.

[0040] like Figure 1-4 As shown, the flipping unit includes a linear drive unit 20 and a linkage unit 40. The two ends of the linear drive unit 20 are hinged to the movable part 11 and the frame 10 / moving seat 33 to drive the movable part 11 to flip, or the two ends of the linear drive unit 20 are hinged to the frame 10 / moving seat 33 and the linkage unit 40 to drive the movable part 11 to flip. The linear drive unit 20 provides stable and linear motion, reducing vibrations or instability that may occur in complex mechanical structures; simultaneously, the linkage unit 40 further optimizes the motion trajectory, improving the smoothness and reliability of the action. The linear drive unit 20 directly controls the angle of the movable part 11, and the linkage unit 40 compensates for and optimizes the flipping trajectory, making the flipping process more natural and smooth, avoiding abrupt movements.

[0041] The linkage unit 40 is connected to both the movable seat 33 and the movable component 11. Driven by the linear drive unit 20, the linkage unit 40 coordinates the overall movement of the movable component 11, ensuring its stability and support in different positions. The linkage unit 40 can be designed with adjustable length or angle to accommodate specific flipping requirements.

[0042] like Figure 1-4As shown, the movable component 11 is equipped with two sets of linear drive structures 50. The linkage unit 40 is connected to the moving ends of the two sets of linear drive structures 50 and the movable seat 33, respectively. The linear drive structure 50 can adaptively adjust to the displacement of the movable seat 33 on the adjustment unit 30 to prevent interference. The linear drive structure 50 includes a slide rail 51, a slider 52, and a drive component 53. Through the combination of the slide rail 51 and the slider 52, the linear drive structure 50 allows the movable seat 33 to slide freely during the adjustment process, avoiding interference problems caused by incomplete matching of motion trajectories. The slide rail 51 and the slider 52 provide a controllable and defined motion path for the movable seat 33. Combined with the linkage unit 40 to adjust the force distribution, it effectively reduces mechanical conflicts.

[0043] The two sets of linear drive structures 50 can evenly distribute the load, avoiding excessive force on one side, reducing local stress concentration, and extending the service life of the structure and components. Because the two sets of linear drive structures 50 act synchronously, the system does not generate excess lateral force or torque in the first direction of motion, thereby improving the smoothness and accuracy of the motion. The linkage unit 40 can form a mechanically "mirror image" structure, effectively counteracting overturning or torsion phenomena that may be caused by asymmetrical forces, improving the overall stability of the system. In complex working environments or vibration environments, the symmetrical structure can better absorb and disperse external impacts, reducing the risk of equipment failure.

[0044] like Figure 1-4 As shown, the linear drive structure 50 moves parallel to the surface of the movable member 11 and perpendicular to the rotation center 60 of the movable member 11. That is, the linear drive structure 50 moves in a plane perpendicular to the axis of the rotation center. The linear drive direction is consistent with the movement direction of the movable member 11, effectively avoiding complex mechanical transformations and ensuring smooth rotation. Because the linear drive direction is parallel to the surface, unnecessary lateral forces are avoided during the drive process, reducing vibration or offset problems caused by lateral forces. The drive method perpendicular to the rotation center 60 reduces the overall system sway caused by the rotation movement, improving the safety and comfort of the adjustable virtual center rotation device.

[0045] like Figure 1-4As shown, the linkage unit 40 includes two sets of first linkages 41, second linkages 42, and third linkages 43. The first linkages 41 are hinged to the movable seat 33 and the third linkages 43, respectively. The two sets of second linkages 42 are hinged to the movable seat 33 and the two sets of third linkages 43, respectively. The extension of the third linkage 43 is hinged to the moving end of the linear drive structure 50. Through the planar polygonal mechanism formed by the hinge points of the first linkages 41 and second linkages 42 and the third linkage 43, flexible adjustment at multiple angles and positions can be achieved to meet different application requirements. This linkage unit 40 can adapt to the relatively complex motion trajectory of the movable seat 33, providing more natural lifting or flipping movements for the moving part 11.

[0046] In an optional embodiment of this utility model, the first link 41, the second link 42, the third link 43, and the movable seat 33 form a parallelogram mechanism. The geometric characteristics of the parallelogram mechanism ensure that the movable seat 33 remains parallel to its initial direction during movement, avoiding tilting or offset. During the driving process, the movement path of the movable seat 33 is strictly constrained by the parallelogram, ensuring the accuracy of flipping or adjusting the angle. The fixed lengths of the links in the parallelogram structure form a closed kinematic chain, resulting in a balanced force on the system during movement, significantly reducing vibration and impact. Because this structure has no additional degrees of freedom, the driving force transmitted to the movable seat 33 through the links does not result in abrupt changes in speed or direction, thus achieving smooth movement.

[0047] like Figure 1-4 As shown, the adjustment unit 30 includes a first linear adjustment device 31 and a second linear adjustment device 32. The second linear adjustment device 32 is disposed at the moving end of the first linear adjustment device 31, and a moving base 33 is disposed at the moving end of the second linear adjustment device 32. The adjustment direction of the first linear adjustment device 31 is a first direction, and the adjustment direction of the second linear adjustment device 32 is a second direction. The first direction and the second direction do not coincide. The first linear adjustment device 31 and the second linear adjustment device 32 control different directions of movement, enabling the system to have free adjustment capability in a two-dimensional plane. Through the superposition of the two adjustment directions, the moving base 33 can realize a variety of complex movement paths, such as linear translation, oblique adjustment, and even curved movement, meeting multifunctional needs.

[0048] like Figure 1-4 As shown, the first direction is the length direction of the frame 10, and the second direction is the vertical direction. The combined adjustment of both directions enables more complex movements, such as creating a tilt angle when adjusting the relative height of the head and foot of the bed to help achieve specific medical care postures.

[0049] like Figure 1-4As shown, the flipping unit and the adjustment unit 30 are located on the lower side of the frame 10. This effectively frees up space above and around the frame 10, maintaining a clean and flat bed surface. This design is suitable for use in confined spaces or environments with multifunctional needs, such as hospital wards or home care scenarios. With no complex structures above, the bed surface can be freely designed to suit different user needs in terms of shape and material, such as using soft padding, waterproof fabric, or segmented support structures to enhance comfort.

[0050] In summary, this invention proposes an adjustable virtual center rotation device. Through the synergistic action of the flipping unit and the adjustment unit 30, the rotation center of the movable component can be precisely adjusted to align with the rotation center of different users' bodies. This effectively solves the problem of poor adaptability caused by the fixed rotation center in traditional adjustable virtual center rotation devices, providing personalized care for users of different heights and body types. It greatly expands the applicability of the adjustable virtual center rotation device, allowing users of all heights and builds to enjoy a comfortable backrest experience. It reduces the relative movement between the back and the bed surface, thus avoiding discomfort caused by clothing being pulled or skin friction. It enhances the comfort and user experience of the adjustable virtual center rotation device, especially for those who are bedridden for extended periods, significantly reducing caregiving pressure and discomfort. It effectively reduces localized pressure on the lumbar spine and hips, preventing discomfort or injury to the lower back caused by uneven force distribution. With long-term use, it can significantly reduce lumbar muscle strain and chronic pain, improving the quality of life for the elderly and those with lower limb disabilities. The movement of the movable component is smoother, reducing the risk of potential mechanical vibration or misoperation. It ensures the safety of the adjustable virtual center rotary device during operation and is suitable for various scenarios such as hospitals, nursing homes, and home care.

[0051] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0052] Although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various alterations and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Therefore, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. An adjustable virtual center rotation device, characterized in that, include: frame; The movable component is mounted on the frame; A flipping unit is connected to the movable component to drive the movable component to flip. An adjustment unit is disposed on the frame, and a movable seat is disposed on the adjustment unit. The adjustment unit is configured to drive the movable seat to move in at least one direction. The movable seat is connected to the flipping unit to adjust the flipping center position of the flipping unit.

2. The adjustable virtual center rotation device according to claim 1, characterized in that, The flipping unit includes a linear drive unit and a linkage unit. The two ends of the linear drive unit are hinged to the movable part and the frame / moving seat to drive the movable part to flip, or the two ends of the linear drive unit are hinged to the frame / moving seat and the linkage unit to drive the movable part to flip.

3. The adjustable virtual center rotation device according to claim 2, characterized in that, The linkage unit is connected to the movable seat and the movable component, respectively.

4. The adjustable virtual center rotation device according to claim 2, characterized in that, The movable component is provided with two sets of linear drive structures, and the linkage unit is connected to the moving end of the two sets of linear drive structures and the moving seat, respectively.

5. The adjustable virtual center rotation device according to claim 4, characterized in that, The linear drive structure moves in a plane perpendicular to the rotation center axis.

6. The adjustable virtual center rotation device according to claim 5, characterized in that, The linkage unit includes two sets of first linkages, second linkages, and third linkages. The first linkages are hinged to the movable seat and the third linkage, respectively. The second linkages are hinged to the movable seat and the third linkage, respectively. The extension ends of the two sets of third linkages are hinged to the moving ends of the two sets of linear drive structures, respectively.

7. The adjustable virtual center rotation device according to claim 6, characterized in that, The first link, the second link, the third link, and the movable seat together form a parallelogram mechanism.

8. The adjustable virtual center rotation device according to claim 2, characterized in that, The adjustment unit includes a first linear adjustment device and a second linear adjustment device. The second linear adjustment device is disposed at the moving end of the first linear adjustment device, and the moving base is disposed at the moving end of the second linear adjustment device. The adjustment direction of the first linear adjustment device is a first direction, and the adjustment direction of the second linear adjustment device is a second direction. The first direction and the second direction do not coincide.

9. An adjustable virtual center rotation device according to claim 8, characterized in that, The first direction is the length direction of the frame, and the second direction is the vertical direction.

10. An adjustable virtual center rotation device according to claim 1, characterized in that, The flipping unit and the adjusting unit are located on the lower side of the frame.

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