A retractable calf massage chair

Abstract

This invention provides a retractable calf massage chair, belonging to the field of massage chairs, and solves the problems of existing massage chairs where the leg massage components cannot be retracted, cannot provide comfortable massage for the legs and feet, and have a poor user experience. It includes a seat frame and an adjustable electric push rod. A button remote control is installed inside the side armrest. A backrest frame is hinged to the upper rear side of the seat frame. One end of the adjustable electric push rod is hinged to the lower rear side of the seat frame, and the other end is hinged to the lower end of the backrest frame. A calf lifting mechanism is hinged to the upper front side of the seat frame. Two adjustable sliding rods are hinged between the calf lifting mechanism and the lower front side of the backrest frame. A leg and foot massage mechanism is driven onto the calf lifting mechanism, and a calf massage mechanism is installed on the leg and foot massage mechanism. A retracting mechanism is located at the upper rear side of the calf lifting mechanism, and a tensioning webbing is provided between the retracting mechanism and the calf massage mechanism. The leg and foot massage components of this invention are retractable and can provide comfortable massage for the soles of the feet or calves.

Description

Technical Field

[0001] This invention belongs to the field of massage chair technology, and relates to a massage chair, particularly a calf massage chair that can be retracted. Background Technology

[0002] With societal progress, the pace of life has accelerated, and work pressure has increased. People are working longer hours and lack exercise, often experiencing soreness and numbness in their legs and lower back. Therefore, massage devices are becoming increasingly popular as an important way to relieve fatigue and stress.

[0003] Traditional massage chairs typically have fixed or simply retractable leg sections that cannot be effectively folded away when not in use, taking up a lot of space. Furthermore, leg functions are usually limited to a single mode of massage or support, lacking the flexibility to switch between multiple functions such as leg support massage, foot support massage, and active stretching, thus limiting the user experience.

[0004] Traditional massage chairs suffer from low structural linkage and automation: the backrest and leg adjustments of many products are independent, requiring separate operations and resulting in poor convenience. The unfolding and turning of the legs mostly rely on manual or simple mechanical methods, lacking precise linkage control driven by electric motors, resulting in stiff movements and an inability to achieve coordinated changes in complex postures.

[0005] Based on this, we propose a retractable calf massage chair. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a retractable calf massage chair. The technical problem this invention aims to solve is: how to integrate the functions of a seat, recliner, leg and foot massage, and stretching product into a compact, automated, safe, and comfortable massage chair to meet the needs of leg and foot massage users.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A retractable calf massage chair includes a seat frame and an adjustable electric push rod. The seat frame has a base cover at its rear, and side armrests on both sides. A button remote control is installed inside each armrest. A seat cushion is located at the top of the seat frame. A backrest frame is hinged to the rear top of the seat frame. One end of the adjustable electric push rod is hinged to the rear bottom of the seat frame, and the other end is hinged to the bottom of the backrest frame. A backrest cover is fitted over the backrest frame. A calf lifting mechanism is hinged to the front top of the seat frame. Two symmetrically adjustable sliding rods are hinged between the calf lifting mechanism and the front bottom of the backrest frame. A leg and foot massage mechanism is driven onto the calf lifting mechanism, and a calf massage mechanism is mounted on the leg and foot massage mechanism. A tension spring connects the leg and foot massage mechanism and the calf massage mechanism. A winding mechanism is located at the upper rear of the calf lifting mechanism. A tensioning webbing is installed between the backrest and the calf massage mechanism. An air pump is installed inside the leg and foot massage mechanism, and an air duct is installed between the air pump and the calf massage mechanism. A button remote control is electrically connected to the electric adjustment rod, the calf massage mechanism, the leg and foot massage mechanism, the rewinding mechanism, and the air pump. The button remote control is connected to a power plug. When the electric adjustment rod is closed, the backrest is in a seat position, and the calf lifting frame mechanism, the leg and foot massage mechanism, and the calf massage mechanism are retracted. When the electric adjustment rod is extended, the backrest is in a reclining position, and the calf lifting frame mechanism, the leg and foot massage mechanism, and the calf massage mechanism are extended. When the leg and foot massage mechanism is closed, it is in a reverse leg support position. When the leg and foot massage mechanism is opened, it is in a front foot support position, and the rewinding mechanism pulls open the calf massage mechanism, while the tension spring extends and locks the calf massage mechanism.

[0009] Working principle of the invention: Overall posture transformation: Synchronous storage and unfolding driven by adjusting the electric push rod.

[0010] Deployment → Recliner State: When the electric adjustment lever extends, it pushes the backrest frame to tilt backward. At this time, the adjustable sliding sleeve hinged to the backrest frame moves accordingly. Its other end pushes the calf lifting frame mechanism to rotate counterclockwise forward and upward around its hinge point with the seat frame, realizing the synchronous deployment of the calf lifting frame mechanism and the backrest frame. The leg and foot massage mechanism and the calf massage mechanism extend and deploy with the calf lifting frame mechanism.

[0011] Retraction → Seat Status: When the electric adjustment lever retracts, pulling the backrest frame forward will straighten it, and the adjustable sliding rod will be pulled back, simultaneously pulling back the calf lifting mechanism. It will automatically retract to its initial position, and the leg and foot massage mechanism and the calf massage mechanism will be retracted along with the calf lifting mechanism. The length of the adjustable sliding rod is adjustable and can be used to pre-adjust the extension angle of the leg and foot massage mechanism.

[0012] Operation of the calf lifting frame mechanism: The leg and foot massage mechanism can be opened or closed by electric control around the calf lifting frame mechanism.

[0013] After unfolding into a reclining chair position, the leg and foot massage mechanism and the retractable mechanism can be further operated.

[0014] Leg rest storage: In the storage state, the leg and foot massage mechanism and the calf massage mechanism are folded together, and their outer surface can be used as a leg rest. The leg and foot massage mechanism massages the back of the calf.

[0015] Unfold the footrest: The leg and foot massage mechanism can be opened electrically around the calf lifting frame mechanism: The leg and foot massage mechanism rotates clockwise forward and downward around the calf lifting frame mechanism, usually until the leg and foot massage mechanism is placed horizontally. At this time, the leg and foot massage mechanism is used as a footrest and massages the feet.

[0016] The coordinated unfolding of the calf massage mechanism: When the leg and foot massage mechanism is unfolded, the tension webbing connected between the calf massage mechanism and the winding mechanism pulls the tension webbing, and the winding mechanism is used to dynamically and in real time control the distance between the calf massage mechanism and the winding mechanism to stabilize the distance. This pulls the calf massage mechanism to rotate counterclockwise, thereby completing the full unfolding of the entire calf section. The tension spring assists in the unfolding process and locks the calf massage mechanism to prevent it from shaking.

[0017] Stretching and Massage Function: When the calf massage mechanism is fully extended, it can massage both sides of the calf. When stretching the calf is needed, the calf massage mechanism can clamp the left and right sides of the calf, and the calf lifting frame mechanism will drive the leg and foot support massage mechanism to move away from it, and then return to its original position to achieve a stretching experience.

[0018] The seat frame and backrest frame are made of stainless steel. The backrest cover has an open placement cavity inside, and the backrest frame is placed inside the open placement cavity. Both sides of the backrest cover have integrally formed side supports, and the inner side of each side support has a speaker. The speaker is electrically connected to the button remote control.

[0019] With the above structure, the seat frame and backrest frame serve as the load-bearing skeleton of the entire massage chair. They are made of stainless steel to ensure that they can stably bear the user's weight, the reaction force of the massage mechanism, and the dynamic load when the electric push rod is adjusted, providing a reliable and non-deformable support foundation for all moving parts.

[0020] The open cavity of the backrest cover houses the backrest frame, which serves as the load-bearing skeleton, thus separating the mechanical structure from the appearance. The cover protects the internal structure, prevents foreign objects from entering, and gives the product a uniform and aesthetically pleasing appearance.

[0021] The side support, as an integral part of the backrest cover, provides ergonomic support, wrapping and supporting the sides of the body when the user is lying down, enhancing comfort and stability when at rest or during massage.

[0022] The speakers are embedded on the inner side, providing an immersive multi-sensory experience, allowing users to further relax their mind and body through music or voice guidance while receiving a body massage.

[0023] Each of the side armrests has a hinged storage flap above it. The button remote control is located inside one of the storage flaps. The seat cushion is U-shaped, and the inner opening of the seat cushion is the same width as the opening of the open placement cavity and is directly opposite each other.

[0024] Using the above structure, the button remote control is integrated into a storage flip cover above one of the side armrests, creating a dedicated and protected storage space. When closed, the flip cover completely covers and locks the remote control, preventing dust, accidental contact, and loss, while maintaining the armrest's smooth lines and clean appearance. When open, it forms a convenient access interface, allowing users to retrieve or operate the remote control without getting up or searching, greatly improving ease of use. The storage flip cover can also hold other items such as tissues and mobile phones.

[0025] The U-shaped seat cushion serves two purposes. First, it mimics the pressure distribution of the buttocks and thighs when the human body is seated. The central indentation provides pressure-free space for the user's tailbone and perineum, helping to alleviate pressure from prolonged sitting, promote ventilation and heat dissipation, and improve basic seating comfort. Second, the backrest frame is used to install the sliding massage device. The inner opening of the seat cushion and the opening of the backrest cover are the same width and are directly opposite each other. This direct alignment ensures that when the user sits down, their back can precisely align with and enter the area covered by the open backrest cover through the inner opening of the seat cushion. This allows the movement trajectory or force of the massage mechanism carried on the internal backrest frame to be accurately transmitted to the user's back without interference from the seat cushion. This is a crucial physical channel and spatial guarantee between the seat cushion and the core massage function.

[0026] The calf lifting frame mechanism includes a fixed frame. Two hinge seats are fixed to the upper parts of the left and right sides of the fixed frame. The two hinge seats are hinged to the upper front side of the frame. Two symmetrically arranged hinge seats are provided on the rear side of the fixed frame. The hinge seats are respectively hinged to the front ends of two adjustable sliding sleeve rods. Anti-pinch guards are detachably provided on both sides of the fixed frame, with each hinge seat extending beyond the anti-pinch guard on the same side. Lifting electric push rods are fixed inside the left and right sides of the fixed frame. A lifting frame is fixed to the lower end of the two lifting electric push rods. A rotary adjustment spindle is fixed to the front side of the lifting frame. The lifting electric push rods are electrically connected to a button remote control.

[0027] Using the above structure, the hinged seats on the upper sides of the fixed frame serve as the core rotation fulcrum, hinged to the upper front side of the seat frame for the entire lower leg lifting mechanism. This is the physical basis for enabling the lower leg section to rotate and retract counterclockwise / clockwise between the "seat state" and the "reclining chair state".

[0028] The hinge seat at the rear of the fixed frame serves as a crucial power input interface, hinged to the front ends of the two adjustable sliding sleeves on the left and right sides, respectively. When the backrest frame moves under the drive of the adjusting electric push rod, the adjustable sliding sleeves push and pull this hinge seat, thereby accurately transmitting the posture changes of the backrest and converting them into the overall rotation of the lower leg part, achieving synchronous movement.

[0029] The anti-pinch cover forms a physical isolation barrier, separating the internal moving lifting mechanism and the extended part of the hinge seat 2 from the external environment. This effectively prevents the user's clothing, limbs, or foreign objects from being caught in the gaps between the mechanisms during movement, eliminating the risk of pinching injuries. It also serves to prevent dust and enhance aesthetics.

[0030] The lifting electric push rod is longitudinally fixed inside the fixed frame on both the left and right sides, forming the second-level power core of the mechanism. Its extension and retraction movement is electrically controlled by a button remote control.

[0031] The lifting frame is fixed to the lower end of the two electric lifting push rods, serving as the output platform for the lifting motion.

[0032] When the calf stretching and massage function is needed, the lifting electric push rod extends, pulling the lifting frame vertically away from the body. Since the leg and foot massage mechanism is mounted on this lifting frame, and the calf is fixed in the calf massage mechanism, this achieves longitudinal stretching of the calf.

[0033] The rotation adjustment spindle is fixed to the front of the lifting frame. It is a key component for connecting and installing the leg and foot massage mechanism. Its function is not only to provide a solid mounting point, but also to allow the leg and foot massage mechanism to be finely adjusted or rotated around it to adapt to different usage postures and realize the functional conversion from "leg support" to "foot support".

[0034] The winding mechanism includes a winding roller frame and a winding motor. Both the winding roller frame and the winding motor are fixed on the upper rear end of the fixed frame, and the winding roller frame is located in the middle of the rear end of the fixed frame. A winding roller is rotatably installed inside the winding roller frame, and a support roller is rotatably installed on the winding roller frame. The output shaft of the winding motor is fixedly connected to the winding roller.

[0035] With the above structure, the take-up motor serves as the main power source of the mechanism, and its output shaft is fixedly connected to the take-up roller. When the take-up motor is working, it directly drives the take-up roller to rotate in either the forward or reverse direction.

[0036] Tensioning webbing winding and unwinding: One end of the tensioning webbing is wound and fixed on the take-up roller, and the other end is connected to the calf massage mechanism. When the take-up motor drives the take-up roller to rotate, it can actively wind up or release the tensioning webbing, thereby directly controlling the traction or relaxation of the calf massage mechanism through the change in the length of the tensioning webbing.

[0037] The support rollers on the take-up roller frame ensure that the tensioned webbing runs smoothly and without jamming during take-up and unwinding, while reducing abnormal wear on the tensioned webbing.

[0038] When the calf needs to be switched from the "folded leg support" state to the "unfolded foot support" state, the take-up motor simultaneously receives a command from the button remote control, driving the take-up roller to release the tensioned webbing. At the same time, in coordination with the unfolding action of the leg and foot massage mechanism, the take-up mechanism releases the tensioned webbing in a timely manner, allowing the calf massage mechanism to be pulled counterclockwise by the tension spring or its own weight, thus achieving the coordinated unfolding of the upper and lower calves.

[0039] The winding motor can accurately control the release length and speed of the tensioned webbing, thereby dynamically and in real time adjusting the distance between the calf massage mechanism and the fixed point of the winding mechanism, ensuring a smooth unfolding process and controllable angle.

[0040] Once the calf massage mechanism reaches the predetermined unfolding angle, the take-up motor can drive the take-up roller to lock or maintain the current tensioned webbing length. At this time, the tensioned webbing and the tension spring together form a tensioning system. The tensioned webbing provides the main positional constraint force, effectively locking the calf massage mechanism and preventing unnecessary shaking or rebound during massage or user activity, ensuring a stable feel during use.

[0041] When the calf needs to be fully retracted, the rewind motor can reverse the tension of the webbing to help pull the calf massage mechanism back to the position where it is folded and joined with the leg and foot massage mechanism.

[0042] The leg and foot massage mechanism includes a lower support cover. A rotary adjustment motor, a hollow shaft reducer, and two symmetrically arranged rotating sleeves are fixed to the upper end of the lower support cover. The hollow shaft reducer is located in the middle of the lower support cover. The output shaft of the rotary adjustment motor is connected to the input shaft of the hollow shaft reducer. The output shaft of the hollow shaft reducer is hollow and fixedly mounted on the rotary adjustment main shaft. The rotating sleeves are rotatably mounted at both ends of the rotary adjustment main shaft. A roller motor and two symmetrically arranged mounting sleeves are also fixed to the lower support cover. The system consists of a frame and two symmetrically arranged bushings. A roller shaft rotates between the two bushings and is connected to the output shaft of a roller motor. Two rollers are fixed on the roller shaft. An upper support cover is detachably provided at the upper end of the lower support cover, forming an installation space between the lower and upper support covers. The air pump, lifting frame, rotary adjustment main shaft, roller shaft, rollers, bushings, and roller motor are all located inside the installation space. Two mounting brackets extend through the upper support cover, and each mounting bracket is equipped with a tension spring latch. The rotary adjustment motor and roller motor are electrically connected to a button remote control.

[0043] With the above structure, the rotation adjustment motor serves as the power source for attitude changes, and its output shaft is connected to the input shaft of the hollow shaft reducer. The hollow shaft reducer reduces the speed and amplifies the torque, adapting to the larger torque required to drive the entire mechanism to rotate.

[0044] The output shaft of the hollow shaft reducer is fixedly mounted on the rotation adjustment main shaft from the lifting frame. The rotation adjustment main shaft serves as a fixed support shaft, while the entire leg and foot massage mechanism is "suspended" from the rotation adjustment motor via the hollow shaft reducer and can rotate around this main shaft.

[0045] When the rotation adjustment motor is powered on, it is driven by the hollow shaft reducer to make the entire lower support cover and all the components fixed to it rotate around the rotation adjustment main shaft, thereby realizing the electric flipping from storage (leg support state) to unfolding (foot support state).

[0046] The rotating sleeves on both sides are also rotatably mounted on both ends of the rotary adjustment main shaft. The rotating sleeves and the hollow shaft reducer together form a three-point support, ensuring that the leg and foot massage mechanism is evenly stressed and runs smoothly when rotating and bearing weight, avoiding jamming.

[0047] The roller motor serves as the power source for the massage function, and its output shaft is connected to the roller shaft via a transmission mechanism.

[0048] The roller shaft is supported and rotatably mounted within the installation space by bushings at both ends. The two rollers fixed on the roller shaft rotate synchronously with it.

[0049] When the user's feet are placed on the upper support surface that serves as a footrest, the rotating rollers can knead and roll to massage the soles of the feet.

[0050] When the user's calves are placed on the back surface of the lower support cover that serves as a leg rest, the rotating rollers can knead and roll to massage the back of the calves.

[0051] Two mounting brackets extending through the upper support cover are equipped with spring hooks, which are interfaces for connecting the other end of the spring. Through the tension of the spring, the mechanism helps to stabilize the calf massage mechanism when it is unfolded and keeps it in a close fit when it is in the leg support position.

[0052] The lower and upper supports together form a sealed installation space, serving as both a safety enclosure and a load-bearing platform.

[0053] Load-bearing and integration: All moving and electrical components, such as the air pump, lifting frame connection, rotary adjustment spindle, roller shaft, roller, bushing and roller motor, are integrated and encapsulated within.

[0054] Safety and Protection: Effectively prevents the user's limbs and clothing from coming into contact with the internal moving parts, eliminating the risk of pinching injuries, while also being dustproof and waterproof, improving safety and durability.

[0055] The outer surface of the upper support covers forms a functional plane that directly contacts the user's feet, serving as a massage base when in footrest mode. The rear surface of the lower support covers forms a functional plane that directly contacts the user's calves, serving as a massage base when in legrest mode.

[0056] The lower support cover has two lower avoidance holes, which are located below the rollers at the corresponding positions. The lower part of the lower support cover has four limiting protrusions, with each pair of limiting protrusions forming a group. The two limiting protrusions in the same group are located on both sides of the lower avoidance holes at the corresponding positions. The upper support cover has two foot placement areas at the top, and each foot placement area has an upper avoidance hole at the bottom, which is located above the rollers at the corresponding positions.

[0057] With the above structure, the lower and upper avoidance holes are located above and below the roller, forming a "functional window". When the roller rotates under the drive of the roller motor, the protruding part of the rotating roller is exposed through the upper and lower avoidance holes, so that it can directly and unobstructedly contact and act on the back of the user's calf (leg support state) or the sole of the foot (foot support state), thereby ensuring the efficient transmission of massage force and a real kneading sensation.

[0058] The limiting protrusions are located on both sides of the lower avoidance hole. In the leg rest massage state, it is convenient to quickly place the calf, while preventing the user's calf from sinking too much into or contacting the edge of the lower avoidance hole, preventing the skin or soft tissue from being rolled in or causing uncomfortable friction with the edge of the hole, and ensuring the safety and comfort of the massage process.

[0059] The foot area is a clearly marked or designed area on the upper surface of the cover, which facilitates quick foot placement.

[0060] The calf massage mechanism includes a calf fixing seat, with a webbing connecting seat fixed to the upper end of the calf fixing seat. One end of the tensioned webbing is connected to a support roller, and the other end of the tensioned webbing is connected to the webbing connecting seat. Connecting side plates are fixed to both the left and right sides of the calf fixing seat. The connecting side plates are rotatably mounted on the mounting bracket on the same side. A tension spring hook is fixed to the connecting side plate, and the two ends of the tension spring are respectively hooked to tension spring hook one and tension spring hook two on the same side. Calf side covers are detachably provided on the outer side of the connecting side plates. A calf main cover is detachably provided on the front side of the calf fixing seat. The calf main cover is engaged with the two calf side covers. Tube holes are opened on both sides of the calf main cover. The calf main cover has two leg placement areas. Massage side airbags are provided on both the left and right sides of the leg placement areas. The four massage side airbags are connected to air guide tubes. The air guide tubes on both sides pass through the tube holes on the same side. Pressure sensors are provided on the massage side airbags. The pressure sensors are electrically connected to the button remote control.

[0061] With the above structure, the webbing connector is the core control input point for the mechanism's movement. One end of the tensioned webbing is connected to this connector, while the other end is controlled by the winding mechanism.

[0062] The winding motor directly controls the distance between the calf support and the fixed point (winding mechanism) by winding and unwinding the tensioned webbing. Releasing the tensioned webbing allows the mechanism to unfold under gravity or external force, while winding the tensioned webbing pulls it back, thus achieving precise and active electric adjustment of the unfolding angle of the calf massage mechanism.

[0063] The connecting side plate is rotatably mounted on the same side of the mounting bracket, forming the physical rotational connection point between the mechanism and the lower leg and foot massage mechanism, thus realizing the mechanical basis for the lower leg part to rotate counterclockwise / clockwise (unfold and fold) relative to the leg and foot massage mechanism.

[0064] The two ends of the tension spring are respectively hooked onto the tension spring latch one on the connecting side plate and the tension spring latch two on the mounting bracket, forming a continuously acting elastic tension system. During the unfolding process, the tension spring is stretched, and the stored elastic force assists the unfolding action. More importantly, after unfolding to the correct position, it works in conjunction with the tensioned webbing to provide a pre-tension force that tightens the entire lower leg mechanism in the folding direction. This effectively counteracts gaps between components and external disturbances, locks the mechanism, eliminates wobbling, and ensures stability during massage or load-bearing.

[0065] The massage side airbags are the direct actuators for the massage and clamping functions. They are arranged in pairs on the left and right sides of the leg area and connected to the air pump through air ducts.

[0066] Massage mode: The air pump alternately inflates and deflates the airbag according to a program, which rhythmically squeezes and relaxes the muscles on both sides of the calf, achieving a kneading massage.

[0067] Clamping / Stretching Mode: When calf stretching is required, all airbags inflate simultaneously to a higher pressure, thereby firmly and flexibly clamping the user's calf from both sides, providing a safe point of force for subsequent lifting and stretching movements and preventing slippage.

[0068] The pressure sensor integrated on the massage side airbag is a key safety and comfort control element. It monitors the pressure applied in real time and feeds the signal back to the control system of the button remote control. This enables: intensity control, maintaining the massage intensity within a comfortable range based on user settings or automatic programs; and clamping confirmation and protection, ensuring sufficient clamping pressure without causing discomfort or injury in stretching mode, achieving adaptive flexible clamping.

[0069] The main calf cover and side calf covers form a removable protective shell. Its principle is to enclose the internal mechanical structure, provide an aesthetically pleasing and smooth surface for human contact, and protect the user from the effects of internal moving parts.

[0070] Compared with existing technologies, this retractable calf massage chair has the following advantages:

[0071] Intelligent linkage, multi-functional, and ultimate space efficiency: A single main electric actuator can simultaneously control the opening and closing of the backrest and leg rests, enabling a one-click transformation from a compact seat to a comfortable recliner. The highly efficient structural linkage eliminates the need for separate user operations, saving space and offering ease of use.

[0072] Multifunctional, with separate treatment for legs and feet, offering a comprehensive upgraded experience: The calf section integrates storage, leg support massage, footrest rotation, foot kneading, airbag clamping, and active stretching. The upper and lower calves unfold electrically in tandem, achieving a seamless switch from single support to multi-mode massage care, meeting the needs of all-round relaxation for the legs and feet.

[0073] Safety first, comfort paramount, and user-friendly interface: All movement mechanisms are equipped with protective covers to eliminate the risk of pinching injuries. Airbags feature pressure sensors for intelligent force control and safe clamping. The U-shaped seat, foot / leg area, and side support design significantly enhance riding comfort and operational guidance.

[0074] Mechatronics integration, modular packaging, and intelligent and reliable control: Multiple motors and air pumps work collaboratively under the command of a central remote controller to achieve precise control of complex movements. The main functional modules are all encapsulated in detachable housings, with a neat internal structure that balances ease of maintenance, safety of use, and overall aesthetics. Attached Figure Description

[0075] Figure 1 This is a schematic diagram of the structure of the present invention in its unfolded state.

[0076] Figure 2 This is a structural schematic diagram of the present invention in its stored state.

[0077] Figure 3 This is a schematic diagram of the structure of the present invention when the backrest is reclined and the lower legs are extended.

[0078] Figure 4 This is a schematic diagram of the structure of the present invention when the backrest is reclined and the lower legs are tucked in.

[0079] Figure 5 This is a three-dimensional structural diagram of some components in this invention.

[0080] Figure 6 This is a three-dimensional structural diagram of the winding mechanism, calf lifting frame mechanism, calf massage mechanism, and leg and foot support massage mechanism in this invention.

[0081] Figure 7 This is an exploded top three-dimensional structural diagram of the winding mechanism, calf lifting frame mechanism, calf massage mechanism and leg and foot support massage mechanism in this invention.

[0082] Figure 8 This is an exploded lower three-dimensional structural diagram of the winding mechanism, calf lifting frame mechanism, calf massage mechanism and leg and foot support massage mechanism in this invention.

[0083] Figure 9 This is an exploded three-dimensional structural diagram of the winding mechanism, calf lifting frame mechanism, calf massage mechanism, and leg and foot support massage mechanism in this invention.

[0084] In the diagram: 1. Seat frame; 2. Backrest frame; 3. Base cover; 4. Backrest cover; 5. Side armrests; 6. Seat cushion; 7. Calf massage mechanism; 8. Leg and foot massage mechanism; 9. Calf lifting mechanism; 10. Adjustable sliding sleeve; 11. Open storage cavity; 12. Speaker; 13. Side leaning seat; 14. Storage flip cover; 15. Rewinding mechanism; 16. Adjustable electric push rod; 17. Rewinding roller frame; 18. Rewinding motor; 19. Anti-pinch cover; 20. Fixing frame; 21. Hinge seat one; 22. Hinge seat two; 23. Lifting frame; 24. Rotating sleeve; 25. Mounting frame; 26. Rotation adjustment main shaft; 27. Rotation adjustment motor; 28. Lower support cover; 29. ​​Upper support cover; 30. Foot placement area; 31. Upper avoidance hole; 32. Lower leg main cover; 33. Massage side airbag; 34. Tube hole; 35. Lower leg side cover plate; 36. Tension spring; 37. Connecting side plate; 38. Webbing connecting seat; 39. Lower leg fixing seat; 40. Tension spring buckle one; 41. Tension spring buckle two; 42. Roller shaft; 43. Lower avoidance hole; 44. Roller; 45. Bushing; 46. Roller motor; 47. Limiting protrusion; 48. Lifting electric push rod; 49. Tensioned webbing. Detailed Implementation

[0085] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0086] like Figures 1-9As shown, this retractable calf massage chair includes a seat frame 1 and an adjustable electric push rod 16. The seat frame 1 has a base 3 at its rear, and side armrests 5 on both sides. A button remote control is located inside each side armrest 5. A seat cushion 6 is located at the top of the seat frame 1, and a backrest frame 2 is hinged to the rear of the top of the seat frame 1. One end of the adjustable electric push rod 16 is hinged to the rear of the lower end of the seat frame 1, and the other end is hinged to the lower end of the backrest frame 2. The backrest frame 2 is covered with a... The backrest cover 4 is provided. A calf lifting mechanism 9 is hinged to the upper front side of the seat frame 1. Two symmetrically adjustable sliding rods 10 are hinged between the calf lifting mechanism 9 and the lower front side of the backrest frame 2. A leg and foot massage mechanism 8 is driven onto the calf lifting mechanism 9, and a calf massage mechanism 7 is mounted on the leg and foot massage mechanism 8. A tension spring 36 connects the leg and foot massage mechanism 8 and the calf massage mechanism 7. A winding mechanism 15 is located at the upper rear side of the calf lifting mechanism 9. A tensioning webbing 49 is provided between mechanism 15 and calf massage mechanism 7. An air pump is provided inside leg and foot massage mechanism 8. An air duct is provided between the air pump and calf massage mechanism 7. A button remote control is electrically connected to the adjusting electric push rod 16, calf massage mechanism 7, leg and foot massage mechanism 8, winding mechanism 15 and air pump respectively. The button remote control is connected to a power plug. When adjusting electric push rod 16 is closed, backrest frame 2 is in seat state, calf lifting frame mechanism 9, leg and foot massage mechanism 8 and calf massage mechanism 7 are retracted. When adjusting electric push rod 16 is extended, backrest frame 2 is in reclining chair state, calf lifting frame mechanism 9, leg and foot massage mechanism 8 and calf massage mechanism 7 are extended. When leg and foot massage mechanism 8 is closed, leg and foot massage mechanism 8 is in reverse leg support state. When leg and foot massage mechanism 8 is opened, leg and foot massage mechanism 8 is in front foot support state, and winding mechanism 15 pulls open calf massage mechanism 7, tension spring 36 is stretched and locked calf massage mechanism 7.

[0087] I. Overall posture transformation: Adjusting the synchronous storage and unfolding driven by the electric push rod.

[0088] Deployment → Recliner State: When the electric push rod 16 extends, it pushes the backrest frame 2 to tilt backward. At this time, the adjustable sliding sleeve 10 hinged to the backrest frame 2 moves accordingly. Its other end pushes the calf lifting frame mechanism 9 to rotate counterclockwise forward and upward around its hinge point with the seat frame 1, realizing the synchronous deployment of the calf lifting frame mechanism 9 and the backrest frame 2. The leg and foot massage mechanism 8 and the calf massage mechanism 7 extend and deploy with the calf lifting frame mechanism 9.

[0089] Retraction → Seat Status: When the electric push rod 16 is retracted, the backrest frame 2 is pulled forward to return to its original position, the adjustable sliding rod 10 is pulled back, and the calf lifting frame mechanism 9 is pulled back simultaneously, automatically returning to its initial position. The leg and foot massage mechanism 8 and the calf massage mechanism 7 are retracted along with the calf lifting frame mechanism 9. The length of the adjustable sliding rod 10 is adjustable and can be used to pre-adjust the extension angle of the leg and foot massage mechanism 8.

[0090] II. Operation of the calf lifting frame mechanism 9: The leg and foot massage mechanism 8 can be opened or closed around the calf lifting frame mechanism 9 by electric control.

[0091] After unfolding into a reclining chair position, the leg and foot massage mechanism 8 and the retracting mechanism 15 can be further operated.

[0092] Leg rest storage: In the storage state, the leg and foot massage mechanism 8 and the calf massage mechanism 7 are folded together, and their outer surfaces can be used as leg rests. The leg and foot massage mechanism 8 massages the back of the calf.

[0093] Unfold the footrest: The leg and foot massage mechanism 8 can be opened by electric control around the calf lifting frame mechanism 9: The leg and foot massage mechanism 8 rotates clockwise forward and downward around the calf lifting frame mechanism 9, generally until the leg and foot massage mechanism 8 is placed horizontally. At this time, the leg and foot massage mechanism 8 is used as a footrest and massages the feet.

[0094] The coordinated unfolding of the calf massage mechanism 7: When the leg and foot massage mechanism 8 is opened, the tension webbing 49 connected between the calf massage mechanism 7 and the winding mechanism 15 is pulled to pull up and down the tension webbing 49, and to dynamically control the distance between the calf massage mechanism 7 and the winding mechanism 15 in real time. This pulls the calf massage mechanism 7 to rotate counterclockwise, thereby completing the full unfolding of the entire calf part. The tension spring 36 assists in the unfolding process and locks the calf massage mechanism 7 to prevent it from shaking.

[0095] Stretching and Massage Function: When the calf massage mechanism 7 is fully extended, it can massage the left and right sides of the calf. When stretching the calf is needed, the calf massage mechanism 7 can clamp the left and right sides of the calf, and the calf lifting frame mechanism 9 drives the leg and foot support massage mechanism 8 to move away from it and then return to its original position to achieve a stretching experience.

[0096] The seat frame 1 and backrest frame 2 are made of stainless steel. The backrest cover 4 has an open placement cavity 11 inside, and the backrest frame 2 is placed inside the open placement cavity 11. Both sides of the backrest cover 4 are provided with integrally formed side cushions 13. The inner side of each side cushion 13 is provided with a speaker 12, and the speaker 12 is electrically connected to the button remote control.

[0097] The seat frame 1 and backrest frame 2, as the load-bearing skeleton of the entire massage chair, are made of stainless steel to ensure that they can stably bear the user's weight, the reaction force of the massage mechanism, and the dynamic load when the electric push rod 16 is driven, providing a reliable and non-deformable support base for all moving parts.

[0098] The open placement cavity 11 of the backrest cover 4 houses the backrest frame 2, which serves as the load-bearing skeleton, thus separating the mechanical structure from the appearance. The cover protects the internal structure, prevents foreign objects from entering, and gives the product a uniform and aesthetically pleasing appearance.

[0099] The side support 13, which is an integral part of the backrest cover 4, provides ergonomic support. When the user lies down, it wraps around and supports the sides of the body (especially the arms and torso), enhancing the comfort and stability when at rest or during a massage.

[0100] The speaker 12 is embedded inside the side armrest 13, providing an immersive multi-sensory experience, allowing users to further relax their mind and body through music or voice guidance while receiving a body massage.

[0101] Each side armrest 5 has a hinged storage cover 14. The button remote control is located inside one of the storage covers 14. The seat cushion 6 is U-shaped. The inner opening of the seat cushion 6 is the same width as the opening of the open placement cavity 11 and the positions are directly opposite each other.

[0102] The button remote control is integrated into a storage flip cover 14 above one of the side armrests 5, creating a dedicated and protected storage space. When closed, the flip cover completely covers and locks the remote control, preventing dust, accidental contact, and loss, while maintaining the armrest's smooth lines and clean appearance. When open, it forms a convenient access interface, allowing users to retrieve or operate the remote control without getting up or searching, greatly improving ease of use.

[0103] The storage flip cover 14 can also hold other items, such as tissues, mobile phones, etc.

[0104] The U-shaped seat cushion serves two purposes. First, it mimics the pressure distribution of the buttocks and thighs when the human body is sitting. The concave area in the middle provides a pressure-free space for the user's tailbone and perineum, which helps relieve pressure from prolonged sitting, promotes ventilation and heat dissipation, and improves basic riding comfort.

[0105] Secondly, the backrest frame 2 is used to install the sliding massage device. The inner opening of the seat cushion 6 and the opening of the open placement cavity 11 are the same width and are directly opposite each other. This direct alignment ensures that when the user sits down, their back can be accurately aligned with and enter the area covered by the open placement cavity 11 of the backrest cover through the inner opening of the seat cushion. This allows the movement trajectory or force of the massage mechanism (such as massage core, airbag, etc.) carried on the inner backrest frame 2 to be accurately transmitted to the user's back without interference from the seat cushion. This is a crucial physical channel and spatial guarantee between the seat cushion and the core massage function.

[0106] The calf lifting frame mechanism 9 includes a fixed frame 20. Two hinge seats 21 are fixed to the upper parts of both the left and right sides of the fixed frame 20. The two hinge seats 21 are hinged to the upper front side of the seat frame 1. Two symmetrically arranged hinge seats 22 are provided on the rear side of the fixed frame 20. The hinge seats 22 are respectively hinged to the front ends of two adjustable sliding sleeve rods 10. Anti-pinch guards 19 are detachably provided on both the left and right sides of the fixed frame 20. The hinge seats 22 extend from the anti-pinch guards 19 on the same side. Lifting electric push rods 48 are fixed inside both the left and right sides of the fixed frame 20. A lifting frame 23 is fixed to the lower end of the two lifting electric push rods 48. A rotary adjustment spindle 26 is fixed to the front side of the lifting frame 23. The lifting electric push rods 48 are electrically connected to a button remote control.

[0107] The hinged seats 21 on both sides of the fixed frame 20 serve as the core rotation fulcrum, hinged to the upper front side of the seat frame 1 for the entire lower leg lifting frame mechanism 9. This is the physical basis for realizing the overall counterclockwise / clockwise rotation and storage of the lower leg part between the "seat state" and the "reclining chair state".

[0108] The hinge seat 22 on the rear side of the fixed frame 20 serves as a key power input interface, and is hinged to the front ends of the two adjustable sliding sleeves 10 on the left and right sides respectively. When the backrest frame 2 moves under the drive of the adjusting electric push rod 16, the adjustable sliding sleeves 10 push and pull this hinge seat, thereby accurately transmitting the posture change of the backrest and converting it into the overall rotation of the lower leg part, realizing synchronous movement.

[0109] The anti-pinch cover 19 forms a physical isolation barrier, separating the internal moving lifting mechanism (such as the lifting electric push rod 48 and the lifting frame 23) and the extended part of the hinge seat 22 from the external environment. This effectively prevents the user's clothing, limbs or foreign objects from being caught in the gap between the mechanisms during movement, eliminating the risk of pinching injuries, while also serving the functions of dust prevention and aesthetics.

[0110] The lifting electric push rod 48 is longitudinally fixed inside the fixed frame 20 on both the left and right sides, forming the second-level power core of the mechanism. Its extension and retraction movement is electrically controlled by a button remote control.

[0111] The lifting frame 23 is fixed to the lower end of the two electric lifting push rods 48, serving as the output platform for the lifting motion.

[0112] When the calf stretching and massage function is required, the lifting electric push rod 48 extends, pulling the lifting frame 23 vertically away. Since the leg and foot massage mechanism 8 is mounted on this lifting frame, and the calf is fixed in the calf massage mechanism 7, this achieves longitudinal stretching of the calf.

[0113] The rotation adjustment spindle 26 is fixed to the front side of the lifting frame 23. It is a key component for connecting and installing the leg and foot massage mechanism 8. Its function is not only to provide a solid mounting point, but also to allow the leg and foot massage mechanism 8 to be finely adjusted or rotated around it to adapt to different usage postures and realize the functional conversion from "leg support" to "foot support".

[0114] The winding mechanism 15 includes a winding roller frame 17 and a winding motor 18. Both the winding roller frame 17 and the winding motor 18 are fixed on the upper rear end of the fixed frame 20. The winding roller frame 17 is located in the middle of the rear end of the fixed frame 20. A winding roller is rotatably provided inside the winding roller frame 17. A support roller is rotatably provided on the winding roller frame 17. The output shaft of the winding motor 18 is fixedly connected to the winding roller.

[0115] The take-up motor 18 serves as the main power source for the mechanism, and its output shaft is fixedly connected to the take-up roller. When the take-up motor 18 is working, it directly drives the take-up roller to rotate in the forward or reverse direction.

[0116] Tensioning and releasing of the tensioning webbing: One end of the tensioning webbing 49 is wound and fixed on the take-up roller, and the other end is connected to the calf massage mechanism 7. When the take-up motor 18 drives the take-up roller to rotate, it can actively wind up or release the tensioning webbing 49, thereby directly controlling the traction or relaxation of the calf massage mechanism 7 through the change in the length of the tensioning webbing 49.

[0117] The support rollers on the take-up roller frame 17 ensure that the tensioned webbing 49 runs smoothly and without jamming during take-up and unwinding, while reducing abnormal wear on the tensioned webbing 49.

[0118] When the calf needs to be switched from the "folded leg support" state to the "unfolded foot support" state, the winding motor 18 simultaneously receives a command from the button remote control, driving the winding roller to release the tensioned webbing 49. At the same time, in coordination with the unfolding action of the leg and foot massage mechanism 8, the winding mechanism 15 releases the tensioned webbing 49 in a timely manner, allowing the calf massage mechanism 7 to be pulled counterclockwise by the tension spring 36 or its own weight, thus realizing the coordinated unfolding of the upper and lower calves.

[0119] The winding motor 18 can accurately control the release length and speed of the tensioned webbing 49, thereby dynamically and in real time adjusting the distance between the calf massage mechanism 7 and the fixed point of the winding mechanism 15, ensuring a smooth unfolding process and controllable angle.

[0120] Once the calf massage mechanism 7 reaches the predetermined unfolding angle (e.g., a large angle with the leg support), the take-up motor 18 can drive the take-up roller to lock or maintain the current length of the tensioned webbing 49. At this time, the tensioned webbing 49 and the tension spring 36 together form a tensioning system. The tensioned webbing 49 provides the main positional constraint force, effectively locking the calf massage mechanism 7 to prevent unnecessary shaking or rebound during massage or user activity, ensuring a stable feel during use.

[0121] When the calf needs to be folded up, the rewind motor 18 can pull the tensioning webbing 49 in the opposite direction to help pull the calf massage mechanism 7 back to the position where it is folded and joined with the leg and foot massage mechanism 8.

[0122] The leg and foot massage mechanism 8 includes a lower support cover 28. A rotary adjustment motor 27, a hollow shaft reducer, and two symmetrically arranged rotating sleeves 24 are fixed to the upper end of the lower support cover 28. The hollow shaft reducer is located in the middle of the lower support cover 28. The output shaft of the rotary adjustment motor 27 is connected to the input shaft of the hollow shaft reducer. The output shaft of the hollow shaft reducer is hollow and is fixedly sleeved on the rotary adjustment main shaft 26. The rotating sleeves 24 are rotatably arranged at both ends of the rotary adjustment main shaft 26. A roller motor 46, two symmetrically arranged mounting brackets 25, and two symmetrically arranged... A bushing 45 is provided, and a roller shaft 42 is rotatably provided between the two bushings 45. The roller shaft 42 is connected to the output shaft of the roller motor 46. Two rollers 44 are fixed on the roller shaft 42. An upper support 29 is detachably provided at the upper end of the lower support 28. An installation space is formed between the lower support 28 and the upper support 29. The air pump, lifting frame 23, rotary adjustment main shaft 26, roller shaft 42, rollers 44, bushing 45 and roller motor 46 are all located inside the installation space. Two mounting brackets 25 extend through the upper support 29. Each of the two mounting brackets 25 is provided with a tension spring buckle 41. The rotary adjustment motor 27 and the roller motor 46 are both electrically connected to the button remote control.

[0123] The rotation adjustment motor 27 serves as the power source for attitude change, and its output shaft is connected to the input shaft of the hollow shaft reducer. The hollow shaft reducer reduces the speed and amplifies the torque to accommodate the large torque required to drive the entire mechanism to rotate.

[0124] The output shaft (hollow inside) of the hollow shaft reducer is fixedly mounted on the rotation adjustment main shaft 26 from the lifting frame 23. The rotation adjustment main shaft 26 serves as a fixed support shaft, while the entire leg and foot massage mechanism 8 is "suspended" by the hollow shaft reducer and the rotation adjustment motor 27 and can rotate around this main shaft.

[0125] When the rotation adjustment motor 27 is powered on, it is driven by the hollow shaft reducer to make the entire lower support cover 28 and all the components fixed to it (except the main shaft) rotate around the rotation adjustment main shaft 26, thereby realizing the electric flipping from storage (leg support state) to unfolding (foot support state).

[0126] The rotating sleeves 24 on both sides are also rotatably mounted on both ends of the rotary adjustment main shaft 26. The rotating sleeves 24 and the hollow shaft reducer together form a three-point support to ensure that the leg and foot massage mechanism 8 is evenly stressed and runs smoothly when rotating and bearing weight, and to avoid jamming.

[0127] The roller motor 46 serves as the power source for the massage function, and its output shaft is connected to the roller shaft 42 via a transmission mechanism (such as a belt, gear, etc.).

[0128] The roller shaft 42 is supported and rotatably mounted within the installation space by bushings 45 at both ends. The two rollers 44 fixed on the roller shaft 42 rotate synchronously with it.

[0129] When the user's feet are placed on the surface of the upper support cover 29, which serves as a footrest, the rotating rollers 44 can perform a kneading and rolling massage on the soles of the feet.

[0130] When the user's calf is placed on the back surface of the lower support cover 28, which serves as a leg support, the rotating roller 44 can perform a kneading and rolling massage on the back of the calf.

[0131] Two mounting brackets 25 extending through the upper support cover 29 are provided with spring hooks 41, which are interfaces for connecting the other end of the spring 36. Through the tension of the spring 36, the mechanism helps to stabilize the calf massage mechanism 7 when it is unfolded and keeps it in a close fit when it is in the leg support state.

[0132] The lower support cover 28 and the upper support cover 29 together form a sealed installation space, serving as a safety housing and load-bearing platform.

[0133] Load-bearing and integration: All moving and electrical components, such as the air pump, the connection of the lifting frame 23, the rotary adjustment main shaft 26, the roller shaft 42, the roller 44, the bushing 45, and the roller motor 46, are integrated and encapsulated within the package.

[0134] Safety and Protection: Effectively prevents the user's limbs and clothing from coming into contact with the internal moving parts, eliminating the risk of pinching injuries, while also being dustproof and waterproof, improving safety and durability.

[0135] The outer surface of the upper support 29 forms a functional plane that directly contacts the user's feet and serves as a massage base when in footrest mode. The rear surface of the lower support 28 forms a functional plane that directly contacts the user's calves and serves as a massage base when in legrest mode.

[0136] The lower support cover 28 has two lower avoidance holes 43, which are located below the rollers 44 at the corresponding positions. The lower part of the lower support cover 28 has four limiting protrusions 47, with each pair of limiting protrusions 47 forming a group. The two limiting protrusions 47 in the same group are located on both sides of the lower avoidance holes 43 at the corresponding positions. The upper support cover 29 has two foot placement areas 30 at the top. Each foot placement area 30 has an upper avoidance hole 31 at the bottom, which is located above the rollers 44 at the corresponding positions.

[0137] The lower avoidance hole 43 and the upper avoidance hole 31 are located above and below the roller 44, respectively, forming a "functional window". When the roller 44 rotates under the drive of the roller motor 46, the protruding part of the rotating roller 44 is exposed through the upper and lower avoidance holes, so that it can directly and unobstructedly contact and act on the back of the user's calf (leg support state) or the sole of the foot (foot support state), thereby ensuring the efficient transmission of massage force and a real kneading sensation.

[0138] The limiting protrusions 47 are located on both sides of the lower avoidance hole 43. In the leg rest massage state, it is convenient to quickly place the calf, while limiting the user's calf from sinking too deep into or contacting the edge of the lower avoidance hole 43, preventing the skin or soft tissue from being rolled in or causing uncomfortable friction with the edge of the hole, and ensuring the safety and comfort of the massage process.

[0139] The foot area 30 is a clearly marked or designed area on the upper surface of the upper cover 29, which facilitates quick foot placement.

[0140] The calf massage mechanism 7 includes a calf fixation seat 39. A webbing connector 38 is fixed to the upper end of the calf fixation seat 39. One end of a tension webbing 49 is connected to a support roller, and the other end of the tension webbing 49 is connected to the webbing connector 38. Connecting side plates 37 are fixed to both the left and right sides of the calf fixation seat 39. The connecting side plates 37 are rotatably mounted on a mounting bracket 25 on the same side. A tension spring hook-and-loop fastener 40 is fixed to the connecting side plate 37. The two ends of a tension spring 36 are respectively hooked onto the tension spring hook-and-loop fastener 40 and a tension spring hook-and-loop fastener 41 on the same side. The outer sides of the connecting side plates 37 are... The lower leg side cover 35 is detachably provided, and the lower leg main cover 32 is detachably provided on the front side of the lower leg fixing seat 39. The lower leg main cover 32 is engaged with the two lower leg side cover 35. The lower leg main cover 32 has tube holes 34 on both sides. The lower leg main cover 32 has two leg placement areas. Massage side airbags 33 are provided on the left and right sides of the leg placement areas. The four massage side airbags 33 are connected to the air guide tubes. The air guide tubes on both sides pass through the tube holes 34 on the same side respectively. The massage side airbags 33 are equipped with pressure sensors, and the pressure sensors are electrically connected to the button remote control.

[0141] The webbing connector 38 is the core control input point for the mechanism's movement. One end of the tensioned webbing 49 is connected to this connector, while the other end is controlled by the winding mechanism 15.

[0142] The winding motor 18 directly controls the distance between the calf fixation seat 39 and the fixed point (winding mechanism 15) by winding and unwinding the tensioned webbing 49. Releasing the tensioned webbing 49 allows the mechanism to unfold under gravity or external force, while winding the tensioned webbing 49 pulls it back, thereby achieving precise and active electric adjustment of the unfolding angle of the calf massage mechanism 7.

[0143] The connecting side plate 37 is rotatably mounted on the mounting bracket 25 on the same side, forming a physical rotational connection point between the mechanism and the lower leg and foot massage mechanism 8, which is the mechanical basis for the lower leg part to rotate counterclockwise / clockwise (unfold and fold) relative to the leg and foot massage mechanism 8.

[0144] The two ends of the tension spring 36 are respectively hooked onto the tension spring latch 40 of the connecting side plate 37 and the tension spring latch 41 of the mounting bracket 25, forming a continuously acting elastic tension system. During the unfolding process, the tension spring is stretched, and the stored elastic force assists the unfolding action. More importantly, after unfolding to the correct position, it works in conjunction with the tension webbing 49 to provide a pre-tension force that tightens the entire lower leg mechanism in the folding direction, effectively offsetting component gaps and external disturbances, locking the mechanism, eliminating wobbling, and ensuring stability during massage or load-bearing.

[0145] The massage side airbags 33 are the direct actuators for the massage and clamping functions. They are arranged in pairs on the left and right sides of the leg area and are connected to the air pump through air ducts.

[0146] Massage mode: The air pump alternately inflates and deflates the airbag according to a program, which rhythmically squeezes and relaxes the muscles on both sides of the calf, achieving a kneading massage.

[0147] Clamping / Stretching Mode: When calf stretching is required, all airbags inflate simultaneously to a higher pressure, thereby firmly and flexibly clamping the user's calf from both sides, providing a safe point of force for subsequent lifting and stretching movements and preventing slippage.

[0148] The pressure sensor integrated on the massage side airbag 33 is a key safety and comfort control element. It monitors the pressing pressure in real time and feeds the signal back to the control system of the button remote control. This enables: intensity control, keeping the massage intensity within a comfortable range according to user settings or automatic programs; and clamping confirmation and protection, ensuring sufficient clamping pressure without causing discomfort or injury in stretching mode, achieving adaptive flexible clamping.

[0149] The calf main cover 32 and the calf side cover 35 constitute a removable protective shell. Its principle is to enclose the internal mechanical structure, provide an aesthetically pleasing and smooth human body contact surface (leg area), and protect the user from the influence of internal moving parts.

[0150] Working principle of the invention:

[0151] I. Overall Attitude Synchronization Transformation System

[0152] This system is the core of the massage chair's basic form (seat / recliner) transformation, and it adopts a single power source linkage control.

[0153] Power and main control: The electric adjustment push rod 16 serves as the primary power source, with its two ends hinged to the seat frame 1 and the backrest frame 2 respectively. Its extension and retraction directly control the backrest angle.

[0154] Mechanical linkage: The adjustable sliding sleeve 10 serves as the core linkage component, with both ends hinged to the hinge seats 22 of the backrest frame 2 and the calf lifting frame mechanism 9, respectively. Its principle is to convert the angle change of the backrest frame 2 into a pushing and pulling motion of the calf lifting frame mechanism 9.

[0155] Execution process:

[0156] Unfolding: Adjust the electric push rod 16 to extend, push the backrest frame 2 to tilt backward, and the adjustable sliding sleeve rod 10 moves accordingly, pushing the calf lifting frame mechanism 9 to rotate counterclockwise around its hinge point (hinge seat 21) with the seat frame 1, so as to realize the synchronous unfolding of the backrest frame 2 and the calf lifting frame mechanism 9.

[0157] Storage: Adjust the electric push rod 16 to retract, pull the backrest frame 2 back to center, and the adjustable sliding sleeve 10 pulls back the calf lifting frame mechanism 9, causing it to rotate clockwise to reset under the pulling force. The length of the adjustable sliding sleeve 10 is adjustable and is used to preset the initial angle of the calf lifting frame mechanism 9 when it is deployed.

[0158] II. Lower Leg Multifunctional Execution System

[0159] When fully unfolded into a reclining chair position, the lower leg section can independently perform complex functional operations. This system contains multiple subsystems.

[0160] 1. Lower leg lifting and stretching subsystem

[0161] Power and execution: The electric lifting push rod 48 integrated in the lower leg lifting frame mechanism 9 serves as a secondary power source, and its extension and retraction control the vertical displacement of the lifting frame 23.

[0162] When calf stretching is needed, the massage side airbag 33 of the calf massage mechanism 7 clamps and fixes the calf. Subsequently, the lifting electric push rod 48 extends, driving the lifting frame 23 and the entire leg and foot support massage mechanism 8 mounted thereon to move downward, while the calf is fixed, thereby achieving passive longitudinal stretching of the calf muscles.

[0163] 2. Leg / Foot Support Posture Electric Conversion Subsystem

[0164] Power and transmission: The rotary adjustment motor 27 and the hollow shaft reducer constitute a three-stage power source, which is installed inside the leg and foot massage mechanism 8.

[0165] The output shaft of the hollow shaft reducer is fixedly sleeved on the rotation adjustment main shaft 26 (which is fixed on the lifting frame 23). The rotating sleeve 24 provides auxiliary support at both ends of the rotation adjustment main shaft 26.

[0166] The rotation adjustment motor 27 operates and is driven by the hollow shaft reducer to make the entire leg and foot massage mechanism 8 rotate around the fixed rotation adjustment main shaft 26, realizing the electric rotation from vertical (leg support state, massaging the back of the calf) to horizontal (foot support state, massaging the sole of the foot).

[0167] 3. Calf massage mechanism with 7-linkage unfolding and locking subsystem

[0168] Active control: The winding motor 18 of the winding mechanism 15 drives the winding roller to wind up and unwind the tensioned webbing 49. The other end of the tensioned webbing 49 is connected to the webbing connector 38 of the calf massage mechanism 7.

[0169] Linked Deployment: When the leg and foot massage mechanism 8 is electrically opened, the winding motor 18 simultaneously releases the tensioned webbing 49. The tensioned webbing connection point and the tension spring 36 work together: the tension spring 36 is connected between the tension spring buckle 1 40 and the tension spring buckle 2 41, providing deployment assistance; the tensioned webbing 49 precisely controls the release length, thereby pulling the calf massage mechanism 7 to rotate counterclockwise around its hinge point with the mounting frame 25 (connecting side plate 37), realizing the linked deployment of the calf massage mechanism 7.

[0170] Position locking: After unfolding into place, the winding motor 18 locks the length of the tensioned webbing 49, forming a two-way tensioning system with the tension spring 36 in the stretched state, together eliminating structural gaps and effectively locking the calf massage mechanism 7 to prevent shaking during use.

[0171] 4. Massage Function Execution Subsystem

[0172] Foot / lower leg kneading massage: Roller motor 46 drives roller shaft 42 to rotate roller 44. The roller 44, exposed through upper avoidance hole 31 and lower avoidance hole 43, directly acts on the sole of the foot (foot support mode) or the back of the lower leg (leg support mode).

[0173] Massage side airbag 33 massage and clamping:

[0174] Massage: The air pump alternately inflates and deflates the airbag 33 on the massage side through the air duct (through the pipe hole 34) to knead and massage both sides of the calf.

[0175] Intelligent clamping: Before stretching, all massage-side airbags 33 inflate synchronously, gently clamping the calves from both sides. Pressure sensors on the massage-side airbags 33 provide real-time pressure signals to the control system, ensuring a firm and safe clamping force and providing reliable fixation for the stretching action.

[0176] III. Intelligent Control and Security Protection System

[0177] Centralized control: All motors (adjusting electric push rod 16, lifting electric push rod 48, rotating adjustment motor 27, roller motor 46, winding motor 18) and air pumps are electrically controlled by button remote control, realizing integrated operation.

[0178] Safety precautions:

[0179] Anti-pinch design: The anti-pinch cover 19 isolates the lower leg lifting frame mechanism 9; the lower support cover 28 and the upper support cover 29, and the lower leg main cover 32 and the lower leg side cover 35 form a fully enclosed shell, completely encapsulating the moving parts.

[0180] Limitation and guidance: Limiting protrusion 47 prevents limbs from sinking in excessively; foot placement area 30 and leg placement area provide clear functional guidance.

[0181] In summary, the intelligent linkage and multi-functional design maximize space efficiency: a single main electric actuator can simultaneously control the opening and closing of the backrest and leg rests, enabling a one-button transformation from a compact seat to a comfortable recliner. The highly efficient structural linkage eliminates the need for separate user operations, saving space and providing ease of use.

[0182] Multifunctional, with separate treatment for legs and feet, offering a comprehensive upgraded experience: The calf section integrates storage, leg support massage, footrest rotation, foot kneading, airbag clamping, and active stretching. The upper and lower calves unfold electrically in tandem, achieving a seamless switch from single support to multi-mode massage care, meeting the needs of all-round relaxation for the legs and feet.

[0183] Safety first, comfort paramount, and user-friendly interface: All movement mechanisms are equipped with protective covers to eliminate the risk of pinching injuries. Airbags feature pressure sensors for intelligent force control and safe clamping. The U-shaped seat, foot / leg area, and side support design significantly enhance riding comfort and operational guidance.

[0184] Mechatronics integration, modular packaging, and intelligent and reliable control: Multiple motors and air pumps work collaboratively under the command of a central remote controller to achieve precise control of complex movements. The main functional modules are all encapsulated in detachable housings, with a neat internal structure that balances ease of maintenance, safety of use, and overall aesthetics.

[0185] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A retractable calf massage chair, comprising a seat frame (1) and an adjustable electric push rod (16), characterized in that, The seat frame (1) has a base cover (3) on its rear side, and side armrests (5) on both the left and right sides of the seat frame (1). A button remote control is installed inside the side armrests (5). A seat cushion (6) is installed at the upper end of the seat frame (1). A backrest frame (2) is hinged to the rear of the upper end of the seat frame (1). One end of the electric adjustment rod (16) is hinged to the rear of the lower end of the seat frame (1), and the other end of the electric adjustment rod (16) is hinged to the lower end of the backrest frame (2). A backrest cover (4) is fitted over the backrest frame (2). A lower leg is hinged to the front of the upper end of the seat frame (1). The lower front end of the calf lifting frame mechanism (9) and the backrest frame (2) is hinged with two left-right symmetrical adjustable sliding sleeves (10). The calf lifting frame mechanism (9) is equipped with a leg and foot massage mechanism (8). The leg and foot massage mechanism (8) is equipped with a calf massage mechanism (7). A tension spring (36) is provided between the leg and foot massage mechanism (8) and the calf massage mechanism (7). The upper rear end of the calf lifting frame mechanism (9) is equipped with a winding mechanism (15). The winding mechanism (15) is connected to the calf massage mechanism (7). A tensioning webbing (49) is provided, and a winding mechanism (15) is used to wind up and unwind the tensioning webbing (49) to dynamically control the distance between the calf massage mechanism (7) and the winding mechanism (15) in real time. An air pump is provided inside the leg and foot massage mechanism (8), and an air duct is provided between the air pump and the calf massage mechanism (7). The button remote control is electrically connected to the adjusting electric push rod (16), the calf massage mechanism (7), the leg and foot massage mechanism (8), the winding mechanism (15), and the air pump, respectively. The button remote control is connected to a power plug; the adjusting electric push rod (16) is electrically connected to the adjusting electric push rod (16), the calf massage mechanism (7), the leg and foot massage mechanism (8), the winding mechanism (15), and the air pump, respectively. 6) When the backrest (2) is in the seat position, the calf lifting mechanism (9), the leg and foot massage mechanism (8) and the calf massage mechanism (7) are retracted. When the electric push rod (16) is extended, the backrest (2) is in the recliner position, the calf lifting mechanism (9), the leg and foot massage mechanism (8) and the calf massage mechanism (7) are extended. The winding mechanism (15) pulls the calf massage mechanism (7) backward through the tension webbing (49) to open the calf massage mechanism (7). At this time, the tension spring (36) is stretched and locks the calf massage mechanism (7). The lower leg lifting frame mechanism (9) includes a fixed frame (20). The fixed frame (20) has two hinge seats (22) arranged symmetrically on the rear side. The hinge seats (22) are respectively hinged to the front ends of two adjustable sliding sleeves (10). The left and right sides of the fixed frame (20) are fixed with lifting electric push rods (48). The lower ends of the two lifting electric push rods (48) are fixed with lifting frame (23). The front side of the lifting frame (23) is fixed with a rotation adjustment main shaft (26). The lifting electric push rods (48) are electrically connected to the button remote control. When the backrest frame (2) moves under the drive of the adjusting electric push rod (16), the hinge seats (22) are pushed and pulled by the adjustable sliding sleeves (10), so as to accurately transmit the posture change of the backrest frame (2) and convert it into the overall rotation of the lower leg part, so as to achieve synchronous movement. The leg and foot massage mechanism (8) includes a lower support cover (28). A rotary adjustment motor (27), a hollow shaft reducer, and two symmetrically arranged rotating sleeves (24) are fixed to the upper end of the lower support cover (28). The hollow shaft reducer is located in the middle of the lower support cover (28). The output shaft of the rotary adjustment motor (27) is connected to the input shaft of the hollow shaft reducer. The output shaft of the hollow shaft reducer is hollow inside and is fixedly sleeved on the rotary adjustment main shaft (26). The sleeve (24) is rotatably set at both ends of the rotation adjustment main shaft (26); when the rotation adjustment motor (27) is powered on, it is driven by the hollow shaft reducer to make the entire leg and foot massage mechanism (8) rotate around the rotation adjustment main shaft (26), thereby realizing the electric flip-switch between the reverse leg support state and the front foot support state. When the leg and foot massage mechanism (8) is closed, the leg and foot massage mechanism (8) is in the reverse leg support state. When the leg and foot massage mechanism (8) is flipped open, the leg and foot massage mechanism (8) is in the front foot support state.

2. The retractable calf massage chair according to claim 1, characterized in that, The seat frame (1) and backrest frame (2) are made of stainless steel. The backrest cover (4) has an open placement cavity (11) inside. The backrest frame (2) is placed inside the open placement cavity (11). Both sides of the backrest cover (4) are provided with integrally formed side cushions (13). The inner side of each side cushion (13) is provided with a speaker (12). The speaker (12) is electrically connected to the button remote control.

3. A retractable calf massage chair according to claim 2, characterized in that, Each of the side armrests (5) is hinged with a storage flap (14). The button remote control is located inside one of the storage flaps (14). The seat cushion (6) is U-shaped. The inner opening of the seat cushion (6) is the same width as the opening of the open placement cavity (11) and the positions are directly opposite each other.

4. A retractable calf massage chair according to claim 3, characterized in that, The upper part of the left and right sides of the fixed frame (20) is fixed with a hinge seat (21). The two hinge seats (21) are hinged to the front of the upper end of the frame (1). The left and right sides of the fixed frame (20) are detachably provided with anti-pinch guards (19). The hinge seat (22) extends out of the anti-pinch guards (19) on the same side.

5. A retractable calf massage chair according to claim 4, characterized in that, The winding mechanism (15) includes a winding roller frame (17) and a winding motor (18). The winding roller frame (17) and the winding motor (18) are both fixed on the upper rear end of the fixed frame (20), and the winding roller frame (17) is located in the middle of the rear end of the fixed frame (20). A winding roller is rotatably provided inside the winding roller frame (17), and a support roller is rotatably provided on the winding roller frame (17). The output shaft of the winding motor (18) is fixedly connected to the winding roller.

6. A retractable calf massage chair according to claim 5, characterized in that, The lower support cover (28) is also fixed with a roller motor (46), two symmetrically arranged mounting brackets (25) and two symmetrically arranged bushings (45). A roller shaft (42) is rotatably arranged between the two bushings (45). The roller shaft (42) is connected to the output shaft of the roller motor (46). Two rollers (44) are fixed on the roller shaft (42). The upper end of the lower support cover (28) is detachably provided with an upper support cover (29). An installation space is formed between the lower support cover (28) and the upper support cover (29). The air pump, lifting frame (23), rotary adjustment main shaft (26), roller shaft (42), roller (44), bushing (45) and roller motor (46) are all located inside the installation space. The two mounting brackets (25) extend through the upper support cover (29). The two mounting brackets (25) are provided with tension spring buckles (41). The rotary adjustment motor (27) and roller motor (46) are electrically connected to the button remote control.

7. A retractable calf massage chair according to claim 6, characterized in that, The lower support cover (28) has two lower avoidance holes (43), which are located below the roller (44) at the corresponding position. The lower part of the lower support cover (28) has four limiting protrusions (47), and each pair of limiting protrusions (47) forms a group. The two limiting protrusions (47) in the same group are located on both sides of the lower avoidance hole (43) at the corresponding position. The upper support cover (29) has two foot areas (30) at the top. Each foot area (30) has an upper avoidance hole (31) at the bottom. The upper avoidance hole (31) is located above the roller (44) at the corresponding position.

8. A retractable calf massage chair according to claim 7, characterized in that, The calf massage mechanism (7) includes a calf fixing seat (39), with a webbing connecting seat (38) fixed at the upper end of the calf fixing seat (39). One end of the tensioning webbing (49) is connected to the support roller, and the other end of the tensioning webbing (49) is connected to the webbing connecting seat (38). Connecting side plates (37) are fixed on both the left and right sides of the calf fixing seat (39). The connecting side plates (37) are rotatably mounted on the mounting bracket (25) on the same side. A tension spring hook-and-loop fastener (40) is fixed on the connecting side plate (37). The two ends of the tension spring (36) are respectively hooked onto the tension spring hook-and-loop fastener (40) and the tension spring hook-and-loop fastener (41) on the same side. 7) The outer side of the calf side cover (35) is detachably provided. The front side of the calf fixing seat (39) is detachably provided with the calf main cover (32). The calf main cover (32) is engaged with the two calf side cover (35). The calf main cover (32) has tube holes (34) on both sides. The calf main cover (32) has two leg placement areas. Massage side airbags (33) are provided on both sides of the leg placement areas. The four massage side airbags (33) are connected to the air guide tubes. The air guide tubes on both sides pass through the tube holes (34) on the same side respectively. The massage side airbags (33) are provided with pressure sensors. The pressure sensors are electrically connected to the button remote control.

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