Calf triangle plate rotation elevating mechanism

Abstract

A kind of calf triangle plate rotary lifting mechanism, including frame, backrest frame, calf support and telescopic push cylinder for driving backrest frame lifting are provided on the frame, linkage assembly is provided between the calf support and backrest frame, the linkage assembly is used to form the synchronous lifting between calf support and backrest frame, the linkage assembly includes connecting rod and lifting plate, the lifting plate is hinged to the front end of backrest frame and abuts on calf support, one end of the connecting rod is hinged to frame, the other end is hinged to lifting plate.The utility model has the advantages that: the technical scheme is through the design of linkage assembly, the synchronous lifting between backrest frame and calf support is realized, and the lifting degree of calf support is also ensured, to avoid appearing leg lifting scene, improve the stability and operating efficiency of mechanism.

Description

Technical Field

[0001] This utility model relates to a lifting mechanism for a massage chair, and more particularly to a lower leg triangular plate rotating support lifting mechanism. Background Technology

[0002] Massage chairs, as a popular health and leisure device, are widely used in homes, offices, and professional health centers, providing users with convenient massage services to relieve fatigue and promote blood circulation. During use, the user sits in the massage chair, leaning against the backrest and placing their legs on the calf rests. Once the massage program is started, the drive mechanism, such as a telescopic cylinder, rotates the backrest and calf rests in tandem, simulating massage movements and covering the massage area from the back to the legs. To prevent the user's legs from dangling, massage chairs typically have two telescopic cylinders, one for driving the backrest and the other for driving the calf rests. The "leg dangling" phenomenon occurs when the calf rests are not fully raised, failing to form a continuous, smooth support arc with the backrest, causing the user's lower legs to sag and lack sufficient support. This not only causes discomfort and pressure point pain but can also affect the massage effect and even obstruct blood circulation in the legs, reducing overall comfort.

[0003] In current massage chair technology, to reduce manufacturing costs and simplify the structure, the traditional design of two telescopic cylinders independently driving the backrest and leg support has evolved into a single telescopic cylinder driving both. However, while this single-cylinder integration saves resources, it significantly limits the lifting height of the leg support. The leg support cannot be fully raised and can only hang limply on the backrest, failing to form a complete curved support surface. As a result, the user's legs tend to droop, causing a "hanging leg" phenomenon. This not only leads to localized discomfort and uneven massage during use but may also exacerbate fatigue, affecting the product's practicality and user experience. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a lower leg triangular plate rotating support lifting mechanism that increases the lifting height of the lower leg support.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lower leg triangular plate rotary support lifting mechanism, comprising a frame, on which a backrest, a lower leg frame, and a telescopic push cylinder for lifting the backrest are provided. A linkage assembly is provided between the lower leg frame and the backrest, the linkage assembly being used to achieve synchronous lifting between the lower leg frame and the backrest. The linkage assembly includes a connecting rod and a lifting plate, the lifting plate being hinged to the front end of the backrest and abutting against the lower leg frame, one end of the connecting rod being hinged to the frame and the other end being hinged to the lifting plate.

[0006] The beneficial effects of this utility model are as follows: This technical solution, through the design of the linkage component, achieves synchronous lifting between the backrest and the lower leg frame while ensuring the degree of lifting of the lower leg frame, thus avoiding leg sag and improving the stability and operational efficiency of the mechanism. Specifically, the connecting rod and lifting plate in the linkage component work together. When the telescopic push cylinder drives the backrest to rotate, the lifting plate abuts against the lower leg frame, ensuring a smooth transmission of the lifting action and avoiding jamming or incoordination during movement. This reduces mechanical wear, extends the service life of the mechanism, simplifies the structure, and lowers manufacturing costs. As a preferred approach, the lifting plate uses its hinge point with the backrest as a rotation axis. When the telescopic push cylinder pushes the backrest, the connecting rod acts as the force-applying end, pulling the lifting plate to rotate around this axis, thus directly applying thrust to the lower leg frame. For example, the lifting plate can be an L-shaped plate, with its horizontal arm abutting against the bottom of the lower leg frame and its vertical arm hinged to the backrest. In this way, under the pull of the connecting rod, the rotational force of the L-shaped plate is converted into a vertical lifting force, ensuring that the lower leg frame and the backrest move synchronously. Furthermore, the overall design of the linkage assembly optimizes the spatial layout, allowing the mechanism to be more ergonomically designed and improve user comfort when used in medical or rehabilitation equipment. This structure not only achieves functional synchronous lifting but also enhances reliability by reducing the number of components, avoiding the risk of failure caused by complex transmission systems.

[0007] Furthermore, the hinge point between the connecting rod and the lifting plate is located above the hinge point between the lifting plate and the backrest.

[0008] This feature optimizes the force direction of the linkage, making the rotation of the lifting plate smoother, reducing motion resistance, and thus improving lifting efficiency. By setting the hinge point at the top, the linkage forms a more effective lever effect during movement, amplifying the driving torque and ensuring that the resistance force of the lifting plate on the lower leg frame is evenly distributed, avoiding deformation or wear caused by local stress concentration. This not only extends the life of the components but also makes the mechanism stable during high-speed or repetitive operation, making it suitable for occasions requiring frequent adjustments, such as rehabilitation training equipment. As a preferred approach, the hinge point of the linkage can be designed as an eccentric ball joint structure, with the ball joint embedded in the groove of the lifting plate. When the telescopic push cylinder is activated, the ball joint slides in the groove, generating a rotational torque that pushes the lifting plate to rotate rapidly around its hinge axis with the backrest frame. At the same time, the lifting plate uses a roller contact surface, with the rollers abutting against the lower leg frame, reducing friction noise and ensuring smooth lifting.

[0009] Furthermore, the portion of the connecting rod hinged to one end of the frame and the other end hinged to the lifting plate is recessed inward toward the frame.

[0010] This concave design significantly improves the movement trajectory of the connecting rod, avoids interference with the frame or other components, ensures a smoother lifting process, and enhances the operational safety of the mechanism. The concave portion provides extra space during connecting rod movement, reducing the risk of collisions. Especially in compact equipment, this optimizes space utilization and allows for a more compact layout. Simultaneously, the concave shape enhances the rigidity of the connecting rod, resisting bending deformation and maintaining precise transmission of lifting force under heavy loads, thus improving overall durability. As a preferred approach, the connecting rod can employ a U-shaped bending structure, with its middle section recessed towards the inside of the frame to form a buffer zone. When the telescopic push cylinder pushes, the bent portion of the U-shaped connecting rod absorbs vibrations, preventing impact force from being transmitted to the hinge point. Simultaneously, its end connects to the lifting plate via a pin, ensuring that the force line acts directly on the lifting axis.

[0011] Furthermore, the lifting plate and the connecting rod are symmetrically arranged on both sides of the backrest frame. The linkage assembly also includes auxiliary lifting plates symmetrically arranged on both sides of the lower leg frame and abutting against the lower leg frame. The auxiliary lifting plate and the lifting plate are respectively hinged to the inner and outer sides of the backrest frame, and the hinge points of the two are coaxially arranged.

[0012] This symmetrical and coaxial configuration significantly enhances the balance and uniformity of the lifting force, ensuring symmetrical force distribution on the leg support during lifting, preventing skewing or shaking, and improving the stability and safety of the mechanism. The auxiliary lifting plate is coaxially hinged to the lifting plate, allowing multiple components to be controlled simultaneously with a single linkage drive. This simplifies the transmission system, reduces the failure rate, and is applicable to leg supports of different sizes, expanding its application range. In medical or industrial equipment, this design effectively distributes the load, preventing damage caused by localized overload. As a preferred option, the auxiliary lifting plate can be designed as a fork-shaped support, with its inner arm coaxially hinged to the backrest and its outer arm abutting against the side wall of the leg support. When the linkage drives the lifting plate to rotate, the coaxial hinge point ensures synchronous rotation of the auxiliary lifting plate, and the forks of the fork-shaped support engage with the edge of the leg support, providing multi-point support.

[0013] Furthermore, the auxiliary lifting plate includes a pressure plate and a top plate. The pressure plate extends toward the upper end face of the lower leg frame and abuts against the upper end face of the lower leg frame, while the top plate abuts against the back of the lower leg frame. The linkage assembly also includes a return spring, one end of which is fixed to the backrest frame and the other end of which is fixed to the lower leg frame.

[0014] This feature, through the dual contact of the pressure plate and the top plate, ensures stable support during the lifting of the lower leg frame and utilizes a return spring for reliable reset during descent, preventing jamming or loss of control. The pressure plate covers the upper surface of the lower leg frame, providing vertical constraint, while the top plate applies thrust from the back; the combination of these two enhances the continuity of lifting. The return spring automatically pulls back when the lower leg frame descends, ensuring rapid reset and improving the mechanism's response speed and operational safety. This not only reduces manual intervention but also optimizes energy efficiency. As a preferred design, the pressure plate can be designed as an L-shaped arm with rubber pads, its horizontal section conforming to the upper surface of the lower leg frame, and its vertical section connected to the backrest frame, fixing its position through friction during lifting. The top plate uses an arc-shaped plate that conforms to the curve of the lower leg frame's back; when the telescopic push cylinder retracts, the tension of the return spring pulls the lower leg frame downward, and the rubber pads of the pressure plate provide damping cushioning to avoid impact.

[0015] Furthermore, the backrest and the lower leg frame are respectively provided with a first extension shaft and a second extension shaft of similar length for fixing with a reset spring; the first extension shaft is located on the opposite rear side of the auxiliary lifting plate, and the auxiliary lifting plate is provided with a latch corresponding to the first extension shaft. The latch cooperates with the first extension shaft to prevent the pressure plate from falling off the lower leg frame.

[0016] The extension shaft and bayonet design effectively prevents the pressure plate from accidentally falling off during movement, ensuring the reliability of the reset function. Simultaneously, the optimized spring tension distribution through shafts of comparable length prevents spring twisting or failure. The bayonet and extension shaft provide mechanical locking, enhancing structural integrity, especially in high-speed or vibration environments, maintaining stable contact of the pressure plate and improving overall safety. This reduces maintenance needs and extends the mechanism's lifespan. As a preferred design, the bayonet can be a U-shaped groove structure with its opening facing the extension shaft, and an elastic latch within the groove. When the pressure plate rotates with the backrest, the U-shaped groove engages with the first extension shaft, and the elastic latch automatically locks, preventing detachment. Simultaneously, the second extension shaft is threaded onto the backrest, ensuring even application of the reset spring tension. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0018] Figure 2 This is a side view of an embodiment of the present utility model;

[0019] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0020] Figure 4 This is a partial enlarged view of the lifting plate in an embodiment of this utility model;

[0021] Figure 5This is a partial enlarged view of the reset spring in an embodiment of this utility model. Detailed Implementation

[0022] This utility model embodiment provides a lower leg triangular plate rotary support lifting mechanism, such as... Figure 1-5 As shown: The system includes a frame 1, which serves as the basic support structure and is typically constructed using a metal frame to provide stability and load-bearing capacity. A backrest 2 is mounted on the frame 1 to support the user's back and is hinged to the rear of the frame 1. Simultaneously, a leg support 3 is mounted on the frame 1 in front of the backrest 2 to support the user's lower legs; the leg support 3 is also hinged to the front of the frame 1. A telescopic cylinder 4 is mounted on the frame 1. The telescopic cylinder 4 is an electric or hydraulic linear actuator, with one end fixed to the rear of the frame 1 and the other end connected to the middle of the backrest 2. When the telescopic cylinder 4 extends or retracts, it directly drives the backrest 2 to rise or fall around its hinge point with the frame 1.

[0023] A linkage assembly 5 is provided between the backrest frame 2 and the lower leg frame 3 to achieve synchronous lifting of the backrest frame 2 and the lower leg frame 3. The linkage assembly 5 includes a connecting rod 51 and a lifting plate 52. The lifting plate 52 is hinged to the front end of the backrest frame 2 via a first hinge shaft 21, and the front end of the lifting plate 52 abuts against the back of the lower leg frame 3. One end of the connecting rod 51 is hinged to the front side of the frame 1 via a third hinge shaft 11, and the other end is hinged to the upper part of the lifting plate 52 via a second hinge shaft 521. The second hinge shaft 521 of the connecting rod 51 and the lifting plate 52 is located above the first hinge shaft 21 of the backrest frame 2 to optimize the force transmission path. The portion of the connecting rod 51 between the third hinge shaft 11 and the second hinge shaft 521, namely the concave portion 511 of the connecting rod, is concave towards the frame 1. This concave design facilitates smooth movement of the connecting rod 51 during movement without interference.

[0024] The lifting plate 52 and connecting rod 51 are symmetrically arranged on both sides of the backrest 2 to balance the force. The linkage assembly 5 also includes an auxiliary lifting plate 53, which is symmetrically arranged on both sides of the lower leg frame 3 and abuts against the lower leg frame 3. The auxiliary lifting plate 53 and the lifting plate 52 are respectively hinged to the inner and outer sides of the backrest 2, and their hinge points are both on the first hinge axis 21, achieving coaxial arrangement, thereby ensuring that the lifting plate 52 and the auxiliary lifting plate 53 can be driven simultaneously by the connecting rod 51 alone. The auxiliary lifting plate 53 includes a pressure plate 531 and a top plate 532. The pressure plate 531 extends toward the upper end face of the lower leg frame 3 and abuts against the upper end face, while the top plate 532 abuts against the back of the lower leg frame 3. The linkage assembly 5 also includes a return spring 54, which is a tension spring. One end of the return spring 54 is fixed to the backrest 2, and the other end is fixed to the lower leg frame 3, for providing a return tension.

[0025] The backrest frame 2 is provided with a first extension shaft 22, and the lower leg frame 3 is provided with a second extension shaft 31. The first extension shaft 22 and the second extension shaft 31 are of similar length and are used to fix the two ends of the return spring 54. The auxiliary lifting plate 53 is provided with a latch 533 corresponding to the first extension shaft 22. The latch 533 cooperates with the first extension shaft 22 to prevent the pressure plate 531 from falling off the lower leg frame 3 during movement.

[0026] The working principle of the mechanism is as follows: When the telescopic push cylinder 4 extends, it pushes the backrest 2 to slide in the arc-shaped guide rail 12 of the frame 1 through the pulley 23, causing the backrest to rotate and lift upward; since the lifting plate 52 is hinged to the front end of the backrest 2 through the first hinge shaft 21, the lifting of the backrest 2 causes the lifting plate 52 to rotate around the first hinge shaft 21; at the same time, the connecting rod 51 acts on the lifting plate 52 through the second hinge shaft 521. Due to the design of the concave part 511 of the connecting rod 51, its movement trajectory is smooth, pushing the front end of the lifting plate 52 to abut against the lower leg frame 3 and causing the lower leg frame 3 to lift upward; the auxiliary lifting plate 53 is coaxially hinged with the lifting plate 52, so the top plate 532 abuts against the back of the lower leg frame 3 simultaneously, and the pressure plate 531 helps to stabilize the upper surface of the lower leg frame 3, realizing the synchronous lifting of the lower leg frame 3. When the telescopic push cylinder 4 retracts, the backrest 2 descends, the return spring 54 is stretched and provides a rebound force, pulling the lower leg frame 3 downward to return to its original position. At the same time, the pressure plate 531 cooperates with the first extension shaft 22 through the bayonet 533 to prevent it from falling off, ensuring that the lower leg frame 3 descends smoothly without jamming.

[0027] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A lower leg triangular plate rotary support lifting mechanism, comprising a frame, wherein a backrest frame, a lower leg frame, and a telescopic push cylinder for lifting the backrest frame are provided on the frame, and a linkage component is provided between the lower leg frame and the backrest frame, the linkage component being used to achieve synchronous lifting between the lower leg frame and the backrest frame, characterized in that: The linkage assembly includes a connecting rod and a lifting plate. The lifting plate is hinged to the front end of the backrest frame and abuts against the lower leg frame. One end of the connecting rod is hinged to the frame body, and the other end is hinged to the lifting plate.

2. The lower leg triangular plate rotating support lifting mechanism according to claim 1, characterized in that: The hinge point between the connecting rod and the lifting plate is located above and opposite to the hinge point between the lifting plate and the backrest.

3. The lower leg triangular plate rotating support lifting mechanism according to claim 2, characterized in that: The portion of the connecting rod hinged between one end of the frame and one end hinged to the lifting plate is recessed towards the frame.

4. The lower leg triangular plate rotating support lifting mechanism according to claim 1, characterized in that: The lifting plate and connecting rod are symmetrically arranged on both sides of the backrest frame. The linkage assembly also includes auxiliary lifting plates symmetrically arranged on both sides of the lower leg frame and abutting against the lower leg frame. The auxiliary lifting plate and the lifting plate are respectively hinged to the inner and outer sides of the backrest frame, and the hinge points of the two are coaxially arranged.

5. The lower leg triangular plate rotary support lifting mechanism according to claim 4, characterized in that: The auxiliary lifting plate includes a pressure plate and a top plate. The pressure plate extends toward the upper end face of the lower leg frame and abuts against the upper end face of the lower leg frame. The top plate abuts against the back of the lower leg frame. The linkage assembly also includes a return spring. One end of the return spring is fixed to the backrest frame, and the other end is fixed to the lower leg frame.

6. The lower leg triangular plate rotary support lifting mechanism according to claim 5, characterized in that: The backrest and the lower leg frame are respectively provided with a first extension shaft and a second extension shaft of equal length for fixing with a reset spring; the first extension shaft is located on the opposite rear side of the auxiliary lifting plate, and the auxiliary lifting plate is provided with a latch corresponding to the first extension shaft. The latch cooperates with the first extension shaft to prevent the pressure plate from falling off the lower leg frame.

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