Swing angle limiting brake protection mechanism, fitness chair and working method of fitness chair

Abstract

The invention discloses a swing angle limiting brake protection mechanism, a fitness chair and a working method thereof. The fitness chair comprises a frame body (1), a seat plate (101), a power source and a movable mechanism. The movable mechanism comprises a leg plate part, a connecting rod mechanism (6) and a leg plate connecting piece (205) pivoted to the driving shaft (501), and the leg plate part is pivoted to the leg plate connecting piece (205) through a pivoting shaft and located in front of the seat plate (101); the connecting rod mechanism (6) comprises a driving connecting rod (601) and a driven connecting rod (602), wherein the driving connecting rod (601) is fixedly connected to the driving shaft (501) and used for transmitting rotation of the driving shaft (501) outwards, the driven connecting rod (602) is pivoted to the driving connecting rod (601) through a pivot pin (6015), and the driven connecting rod (602) is driven by the driving connecting rod (601) to swing. The driven connecting rod (602) is pivoted with the leg plate part and drives the leg plate part to retract and swing by taking a pivoting shaft as a center, so that the leg plate part is from vertical to horizontal or / and from horizontal to vertical, the driving connecting rod (601) drives the driven connecting rod (602) and the leg plate connecting piece (205), and the leg plate part swings in cooperation with a tie bar by taking a driving shaft (501) as a center, from horizontal to a high position and then from the high position to the horizontal position.

Description

A swing angle limiting braking protection mechanism, a fitness chair and a working method thereof Technical Field

[0001] The present invention relates to the field of fitness equipment, and in particular to a swing angle limiting braking protection mechanism, a fitness chair and a working method thereof. Background Art

[0002] The Yellow Emperor's Classic of Internal Medicine states: "If the tendons grow an inch, life will be extended by ten years." Stretching is a very beneficial exercise, but active stretching is very painful. Based on this, the industry has developed fitness equipment that allows users to stretch passively, so that people can easily achieve the stretching training effect with the help of electric equipment.

[0003] For example, Chinese invention patent CN2014103126389 provides a multifunctional flexibility stretching training bed, comprising a bed frame, a bed plate and a movable bed plate disposed on the upper portion of the bed frame. Inside the bed frame, a battery connected to a motor circuit is disposed at the lower portion of the bed plate. The motor is connected to a reducer via a coupling. Connecting rods are disposed on both sides of the bed frame, with one end of the symmetrically arranged connecting rods connected to the output shaft of the reducer and the other end connected to a leg press plate via a bolt. Inside the bed frame, a push rod motor is disposed at the lower portion of the movable bed plate. The end of the push rod motor is fixedly connected to connecting rod A via a bolt, and the rear end is fixedly connected to the bed frame via a bolt. Connecting rods B are symmetrically disposed on connecting rod A, and the symmetrically arranged connecting rods B are respectively connected to a hip-opening rod via bolts B. This invention enables trainees to complete waist and leg flexibility training on their own.

[0004] However, the fitness equipment of the patent and the fitness equipment of the prior art have the following defects:

[0005] 1. It is not suitable for use in smaller spaces and cannot be used in millions of homes. In general, homes have smaller indoor spaces, so stretching equipment requires a foldable function. That is, it can be unfolded when in use, allowing for temporary use of a larger space, and folded up when not in use to be used as a sofa, thus reducing space usage. Only in this way can it enter millions of homes.

[0006] 2. The convenience and safety of use are not good. In terms of convenience, the stretching equipment mentioned above is not easy to adjust. I cannot freely set the stretching swing angle. The stretching training bed needs to be manually limited after the stretching angle reaches the user's requirements, making it difficult for one person to complete the angle setting. In terms of safety, when stretching the legs, the leg bending angle is dynamic for different users and varies from person to person. When the angle feels appropriate to my body, I can control the machine and confirm this angle. In addition, during the repeated leg bending cycle, personal injury should not be caused by electrical control failure or the leg bending angle being greater than the initial setting.

[0007] 3. Avoid frequent and continuous stretching. If the stretching is not continuous, the effect will be limited. For example, the above equipment can only move the legs to a certain angle, keep them still for a period of time, then return to the original position and then raise them again. The lack of continuity will lead to poor stretching effect.

[0008] Summary of the Invention

[0009] The object of the present invention is to provide a swing angle limiting braking protection mechanism, a fitness chair and a working method thereof, so as to overcome the deficiencies of the above-mentioned prior art.

[0010] In order to achieve the above object, the technical solution of the present invention is:

[0011] A fitness chair, comprising:

[0012] a frame, the frame including a seat for a user to sit or lie on; and

[0013] a power source fixed to the frame and having a drive shaft for outputting power; and

[0014] A movable mechanism that completes retraction and extension swing and stretching swing under the drive of a power source;

[0015] The movable mechanism includes a leg plate portion, a connecting rod mechanism, and a leg plate connecting piece pivotally connected to the driving shaft;

[0016] The leg plate portion is pivotally connected to the leg plate connecting member via a pivot shaft and is located in front of the seat plate;

[0017] The connecting rod mechanism includes an active connecting rod fixedly connected to the driving shaft for transmitting the rotation of the driving shaft outward, and a driven connecting rod pivotally connected to the active connecting rod through a pivot pin, and the driven connecting rod swings under the drive of the active connecting rod;

[0018] The driven connecting rod is pivotally connected to the leg plate portion to drive the leg plate portion to retract and swing around the pivot axis, so that the leg plate portion moves from vertical to horizontal or from horizontal to vertical;

[0019] The active connecting rod drives the driven connecting rod, the leg plate connecting piece and the leg plate part to swing in coordination with the tensioning rod around the driving shaft, so that the driven connecting rod, the leg plate connecting piece and the leg plate part move from the horizontal position to the high position and then from the high position to the horizontal position, in a reciprocating cycle.

[0020] As an improvement to the above technical solution, the power source is a power motor, and the drive shaft is an output shaft of the power motor.

[0021] As an improvement to the above technical solution, the frame includes side frames located on the left and right sides of the seat plate, the side frames are frame structures, there are two power motors, which are respectively fixed on the two side frames, the drive shaft extends horizontally from the side frames to the inside, and the leg plate connector and the active connecting rod are installed on the drive shaft and are located on the inside of the side frames.

[0022] As an improvement to the above technical solution, the leg plate portion includes a leg plate and leg plate mounting members fixed on both sides of the leg plate, and the leg plate is pivotally connected to the driven connecting rod through the leg plate mounting members.

[0023] The fitness chair of the present invention has a power source fixed to the frame (more specifically, fixed to the side frame), a seat plate arranged horizontally for the user to sit or lie down, an active connecting rod fixed to the drive shaft, a leg plate connector pivotally connected to the drive shaft and the leg plate portion front and back, and a driven connecting rod pivotally connected to the leg plate portion and the active connecting rod front and back, so that the leg plate connector is at the same level as the seat plate when it is stationary, and the leg plate portion is naturally vertical in front of the seat plate; when the power source outputs power, the leg plate portion retracts and swings around the pivot axis as the center, and the leg plate portion opens from vertical to horizontal or retracts from horizontal to vertical; after the leg plate portion swings from vertical upward to horizontal or from horizontal downward to vertical, the retraction and swinging is completed. The fitness chair then enters a stretching and swinging state, and the active connecting rod drives the driven connecting rod, the leg plate connector, and the leg plate portion to swing in coordination with the stretching and swinging around the drive shaft as the center, from horizontal to high position and then from high position to horizontal, in a reciprocating cycle. The center position of the output shaft is higher than the seat plate and is located in front of the back plate, which can ensure that the swing center of the leg plate corresponds to the user's hip joint when the leg is stretched, so as to avoid relative movement between the leg plate and the user's calf when the user moves the legs to stretch, thereby avoiding damage to the skin.

[0024] When the fitness chair is in a stationary state, there is no power output, the seat is horizontal, the back panel is located behind the seat and is in a vertical state, and the leg panel is located in front of the seat and is in a vertical state. At this time, the fitness chair is in a sitting state (equivalent to a single sofa) and occupies a small area.

[0025] When the power source outputs power, the drive shaft drives the active connecting rod to swing, and the active connecting rod drives the driven connecting rod to push the leg panel to retract and swing around the pivot axis until the leg panel is flush with the leg panel connector and the seat panel. The fitness chair is in a bed state (equivalent to a single bed), occupying a large area. The fitness chair enters the exercise state and temporarily occupies a large area; at this time, the user can lie flat on the fitness chair.

[0026] Afterward, the power source continues to output power, and the driven connecting rod and leg plate no longer move relative to each other. Driven by the active connecting rod, the driven connecting rod, leg plate, and leg plate connector work together to swing up and down around the drive shaft, a stretching swing. The leg plate of the fitness chair swings upward from horizontal to the set highest point and then back to horizontal, completing a stretching swing cycle. During the upward swing, the fitness chair drives the user's thighs and calves to move in unison, completing the leg stretching swing.

[0027] At the end of the exercise, i.e. the stretching and swinging, the leg plate connectors, the leg plate section and the seat plate are all horizontal, the power source continues to output power, the power shaft rotates downward to drive the leg plate section from a horizontal position back to a vertical position, and then the power source stops outputting power, and the fitness chair is folded into the sitting position and is stationary. At this point, the fitness chair occupies a small area.

[0028] As an improvement to the above technical solution, the movable mechanism further includes a backboard portion located behind the seat plate; the backboard portion includes a first backboard portion or a second backboard portion,

[0029] The first back plate portion is composed of a back plate and guide plates on both sides of the lower rear portion of the back plate. The back plate portion is pivotally connected to the rear portion of the frame body through the guide plates. The guide plates are arc plates, and the layer plates have arc-shaped tracks. The rear portion of the active connecting rod is provided with an axle pin with a bearing. When the active connecting rod is retracted and swung, the active connecting rod slides in contact with the arc-shaped track of the guide plate through the axle pin. When the reinforcement is swung, the axle pin is disengaged from the guide plate.

[0030] The second back panel portion includes a back panel and back panel mounting members located on both sides below the back panel, and the second back panel portion is pivotally connected to the drive shaft through the back panel mounting members; a shift pin is provided at the rear of the active connecting rod; when the fitness chair is retracted or swung, the active connecting rod slides in contact with the bottom surface of the back panel mounting member through the shift pin.

[0031] As an improvement to the above technical solution, a shift groove is provided at the lower portion of the back plate mounting member; the shift pin is in high-pair contact with the top surface of the shift groove.

[0032] As an improvement to the above technical solution, a backboard support plate is horizontally provided at the rear of the frame to provide support for the backboard portion when the backboard portion swings downward to a horizontal position.

[0033] As an improvement to the above technical solution, a limit assembly is provided between the leg plate mounting member and the leg plate connecting member, and the limit assembly includes:

[0034] A limit stopper is provided on the inner side of the lower front portion of the leg plate connecting member to limit the upward swing of the leg plate when the leg plate swings to the horizontal position;

[0035] The limiting tension spring is connected between the leg plate connecting piece and the leg plate portion, and applies force to the leg plate portion and the leg plate connecting piece when limiting, so as to prevent the leg plate portion from tilting forward relative to the leg plate connecting piece when unloaded.

[0036] The first limit block is arranged at the distal end of the active connecting rod and contacts the driven connecting rod when the leg plate portion swings to the horizontal position, so that the driven connecting rod, the leg plate portion, and the leg plate connecting member are relatively stationary;

[0037] When the first limit block contacts the lower bottom surface of the driven link, the first limit block limits the relative movement of the active link and the driven link; during the retraction and extension swing, the first limit block does not touch the driven link, and the active link applies force to the leg plate part through the driven link, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; during the stretching swing, the first limit block touches the driven link, and the active link applies force to the driven link, the leg plate part, and the leg plate connecting piece, so that the driven link, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal.

[0038] As an improvement to the above technical solution, a first limit pin is provided on the outer side of one end of the leg plate connecting member close to the leg plate connecting axis, a second limit pin is provided on the top of the leg plate mounting member, and a limit tension spring is connected between the first limit pin and the second limit pin.

[0039] As an improvement to the above technical solution, a second limit block is provided on the inner side of the middle part of the driven connecting rod; when the leg board is in a horizontal state, the second limit block of the driven connecting rod contacts the lower bottom surface of the leg board connecting piece, so that the driven connecting rod no longer applies force to the leg board alone, but during the stretching swing, the active connecting rod pushes the driven connecting rod, the leg board mounting piece, the leg board, and the leg board connecting piece to move in coordination and perform the stretching swing. At this time, the active connecting rod and the driven connecting rod have no mutual movement.

[0040] When the second limit block contacts the lower bottom surface of the leg plate connecting member, the relative movement between the driven link and the leg plate connecting member is restricted; during the retraction and extension swing, the second limit block does not touch the leg plate connecting member, and the active link applies force to the leg plate portion through the driven link, so that the leg plate portion changes from vertical to horizontal or from horizontal to vertical; during the stretching swing, the second limit block touches the leg plate connecting member, and the active link applies force to the driven link, the leg plate portion, and the leg plate connecting member, so that the driven link, the leg plate portion, and the leg plate connecting member change from horizontal to high position or from high position to horizontal.

[0041] As an improvement to the above technical solution, a protective cover with an open lower end is provided on the periphery of the driven connecting rod, and the driven connecting rod and the leg plate connecting piece are covered in the semi-enclosed structure of the protective cover.

[0042] The active connecting rod is in contact with the back plate, so that the back plate and the leg plate are connected only when they are retracted and extended, but not when the leg plate is stretched and swung.

[0043] In a static state, the active connecting rod is in contact with the back plate portion, and the active connecting rod has a supporting force for the back plate portion, so that the leg plate portion is in a vertical state relative to the back plate portion;

[0044] During the retraction and extension swing, the active connecting rod exerts a thrust on the leg plate portion, and the leg plate portion swings from a vertical state to a horizontal state. At this time, the contact between the active connecting rod and the back plate portion tends to disengage, that is, the supporting force between the active connecting rod and the back plate portion disappears, and the back plate portion swings from a vertical state to a horizontal state under the action of gravity or other forces.

[0045] On the contrary, during the retraction and extension swing, the active connecting rod has a pulling force acting on the leg plate part, and the leg plate part swings from horizontal downward to vertical state. At this time, the active connecting rod has a thrust acting on the back plate part, and the back plate part swings from horizontal upward to vertical state under the action of the thrust.

[0046] During the stretching swing, the active link disengages from the backboard, allowing it to swing up and down on the legboard, completing the stretching exercise. At this point, the force between the active link and the backboard disappears, leaving the backboard horizontal during the stretching exercise, providing support alongside the seat board for the trainee to lie flat. During the stretching swing, the backboard and seat board form a horizontal, extended bed, allowing the trainee to lie flat during stretching and fitness training.

[0047] The second back plate portion is composed of a back plate and a back plate mounting member, which can be an integral component or a split member. Here, the back plate and the back plate mounting member are made into split members for the convenience of installation and maintenance.

[0048] The first back plate portion is composed of a back plate and guide plates on both sides of the lower rear portion of the back plate. Of course, it can also be an integrated component or a split component like the second back plate, both for the convenience of installation and maintenance.

[0049] The fitness chair of the present invention has two kinds of motion and three states:

[0050] When power begins to be output, the active connecting rod drives the driven connecting rod, causing the leg panels to rotate about the leg panel connecting axis, i.e., the pivot axis, to retract and extend. The leg panels swing upward from a vertical position in a static state to a horizontal position, and the corresponding back panel simultaneously swings downward from a vertical position to a horizontal position. The leg panels and leg panels of the fitness chair open to form a bed. When the leg panels swing downward from a horizontal position to a vertical position in a static state, the corresponding back panel simultaneously swings upward from a horizontal position to a vertical position, and the fitness chair returns to a seat position. The leg panels and back panel rotate from vertical to horizontal and then back to vertical, forming a retractable and extendable swinging motion cycle.

[0051] When stretching is needed, the power motor outputs power, driving the active connecting rod through the driven connecting rod, causing the driven connecting rod, leg plate, and leg plate connecting member to rotate about the drive shaft and swing upward. When the swing reaches the highest point, the power is reversed, causing the driven connecting rod, leg plate, and leg plate connecting member to rotate about the drive shaft and swing downward. The driven connecting rod, leg plate, and leg plate connecting member swing upward from horizontal to the highest point of the stretching, and then swing downward to horizontal from the highest point of the stretching, forming a stretching and swinging cycle.

[0052] The first state is the seat state, which is the initial state of the fitness chair. In this state, the fitness chair is stationary, with no power output, and the leg and back panels are naturally vertical. This state is the storage state after use and is also the starting and ending state of the fitness chair's retractable and swinging state.

[0053] The second position is the bed position, in which the leg and back panels open, turning from vertical to horizontal, and aligning with the seat panel. This position marks the end of the retraction and extension swing at its highest point and the beginning of the stretching swing at its lowest point, marking the transition between the retraction and extension swings and the stretching swings.

[0054] The third state is the high position state of the stretching swing. At this position, the stretching swings upward to the highest point, and then switches to swing downward.

[0055] As an improvement to the above technical solution, the fitness chair further comprises a walking mechanism; the walking mechanism comprises a walking traction mechanism for driving the frame to move, and a clutch mechanism for separating and engaging the walking traction mechanism and the frame;

[0056] The walking traction mechanism includes

[0057] The driving shaft and driven shaft are rotatably arranged under the frame, and

[0058] Active running wheels and driven running wheels are respectively arranged on the active shaft and the driven shaft; and

[0059] Double-groove rope pulley, first pulling rope, second pulling rope, pulling spring;

[0060] The double-groove pulley is arranged on the driving shaft and is connected to the driving shaft through a clutch mechanism. One end of the first traction rope is wound in one of the grooves of the double-groove pulley, and the other end of the first traction rope passes through the guide wheel assembly arranged at the front end of the frame and is connected to the back plate; one end of the second traction rope is wound in the other groove of the double-groove pulley and passes through the guide wheel assembly in an opposite direction to the winding direction of the first traction rope, and the other end of the second traction rope is fixedly connected to the guide wheel assembly, one end of the traction spring is connected to the guide wheel assembly, and the other end is connected to the rear end of the frame.

[0061] The guide wheel assembly includes a front bracket fixed to the front end of the frame, a spring connecting plate hung with a traction spring, and a spring seat plate pivotally connected to the spring connecting plate; the spring connecting plate is pivotally connected to the first guide wheel and the second guide wheel in parallel, and the third guide wheel and the fourth guide wheel are pivotally connected to the front bracket in parallel, and the fourth guide wheel is double wheels; the first traction rope is wrapped around one of the fourth guide wheels and then wrapped in the rope groove of the double-groove rope wheel, one end of the second traction rope is connected to the front bracket, and then wrapped around the second guide wheel, the third guide wheel, the first guide wheel, and the other of the fourth guide wheels and then wrapped in the other rope groove of the double-groove rope wheel and in the opposite direction of the pulling direction of the first traction rope; one end of the traction spring is hung on the spring connecting plate, and the other end is hung on the rear bracket and fixedly connected to the rear end of the frame through the rear bracket.

[0062] When the fitness chair is not in use, it is placed as a seat and parked against the wall. When in use, the fitness chair moves forward and leaves the wall, making room for the back panel to change from vertical to horizontal and enter the stretching state. When the stretching is completed, the back panel changes from horizontal to vertical and the fitness chair moves back to its initial position.

[0063] The specific operation is as follows: when placed in a seated position, the tension spring is in an extended, pre-tensioned, energy-storing state. When the fitness chair is activated and ready to enter the stretching state, the active connecting rod rotates downward, causing the back panel to rotate from a vertical position to a horizontal position. The stored energy in the tension spring is released, and the second tension rope pulls the double-groove pulley to rotate, causing the active and driven wheels to move forward. Simultaneously, the first tension rope pulls the back panel downward to a horizontal position. When the back panel transitions from a horizontal position to a vertical position, the above-mentioned operation is exactly the opposite. The back panel is driven upward by the active connecting rod, rotating the first tension rope, which in turn rotates the double-groove pulley, causing the active and driven wheels to move backward. The fitness chair returns to its original initial position, and the second tension rope is wound into the double-groove pulley, causing the tension spring to lengthen and store energy.

[0064] The aforementioned functional design makes the fitness chair of the present application suitable for home use. Specifically, when not in use, the fitness chair can be used as a seat, leaning against a wall, thus minimizing the need for space. During use, the chair can be moved forward a short distance, with the backrest flat, allowing the user to complete a stretching exercise. After the exercise is complete, the backrest is retracted, and the chair is moved backward a short distance, allowing the chair to be placed against a wall, freeing up space indoors.

[0065] As an improvement to the above technical solution, the clutch mechanism includes a first coupling member, a second coupling member, a return spring, and a limit sleeve; the double-groove pulley is rotatably connected to the driving shaft, one side of the double-groove pulley is fixedly connected to the first coupling member, and the first coupling member is rotatably sleeved on the outside of the driving shaft; a second coupling member is provided on the side of the first coupling member away from the double-groove pulley, the second coupling member is sleeved on the outside of the driving shaft, the second coupling member is key-connected to the driving shaft so that the second coupling member slides along the length direction of the driving shaft, and a limit sleeve is provided on the side of the second coupling member away from the first coupling member, the return spring sleeve is located between the second coupling member and the limit sleeve, and the second coupling member is engaged with the first coupling member under the extrusion of the return spring; the second coupling member is connected to the frame through a switch assembly.

[0066] As an improvement to the above technical solution, the switch assembly includes a clutch mounting frame, an eccentric wheel, a hand crank, a movable connecting rod, and a clutch sleeve; the clutch mounting frame is fixedly connected to the frame body, the eccentric wheel and the clutch mounting frame are rotatably connected and the center position of the eccentric wheel is fixedly connected to the hand crank, the middle part of the movable connecting rod is pivotally connected to the pin shaft of the clutch mounting frame, one end of the movable connecting rod abuts against the bottom end of the eccentric wheel, and the bottom of the other end of the movable connecting rod is connected to the clutch sleeve, and the clutch sleeve is arranged on the outside of the second coupling member and pushes the second coupling member to slide toward the limit sleeve.

[0067] The eccentric wheel is rotated by the hand crank to squeeze one end of the movable connecting rod, and the other end of the movable connecting rod pushes the second coupling member in the direction away from the first coupling member through the clutch sleeve. The first coupling member and the second coupling member are in a disconnected state, that is, the power transmission between the double-groove rope pulley and the active shaft is disconnected. At this time, people can push the stretching chair to move freely. When the double-groove rope pulley needs to be connected to the active shaft again, it is only necessary to rotate the eccentric wheel in the opposite direction, and the movable connecting rod no longer pushes the clutch sleeve. Under the action of the reset spring, the second coupling member is re-engaged with the first coupling member, and the forward and backward effects of the walking traction mechanism are realized again.

[0068] The clutch mechanism effectively enables the chair to be moved and stretched in two different states. To move the chair to another location indoors, the clutch handle is moved to the disengaged position, disconnecting the active running wheels from the chair's drive system. Once the chair is positioned appropriately for stretching, the clutch handle is moved to the engaged position, allowing the running wheels to be controlled by the chair's drive system, enabling forward and backward movement during stretching.

[0069] As an improvement to the above technical solution, the fitness chair also includes a safety mechanism with triple protection; the safety mechanism is a combination of a first photoelectric control mechanism and a first mechanical brake protection mechanism, or a combination of a second photoelectric control mechanism and a second mechanical brake protection mechanism.

[0070] As an improvement to the above technical solution, the first mechanical brake protection mechanism is arranged outside the power motor.

[0071] The first mechanical brake protection mechanism includes a positioning assembly fixedly provided on the outer end of the drive shaft, a positioning disk rotatably sleeved on the outer end of the drive shaft, and an electric push rod pivotally connected to the frame; the positioning disk is provided with a brake groove, and a drum brake component is provided in the brake groove so that the drum brake component brakes the positioning disk; the drum brake component is hinged to the electric push rod, and the brake on the positioning disk is released when the electric push rod is shortened;

[0072] The positioning disk is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement; the electric push rod shortens to release the braking of the positioning disk by the drum brake component, and the drive shaft drives the regulating pin to rotate through the positioning assembly, and drives the positioning disk to rotate in coordination when it touches the end of the C-shaped regulating groove. When the user stretches the muscle to the maximum angle, the electric push rod extends, the drum brake component expands, and the positioning disk is braked, completing the mechanical braking setting of the first mechanical brake protection mechanism.

[0073] As an improvement to the above technical solution, the drum brake component includes an elliptical brake sleeve rotatably arranged on the drive shaft, a brake plate fixedly arranged on the brake sleeve, an upper brake pad and a lower brake pad arranged on the periphery of the brake sleeve and hinged to each other at one end by a limit pin, and the upper brake pad and the lower brake pad are provided with brake spring assemblies on opposite sides of the hinged end to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin is hinged to a drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

[0074] As an improvement to the above technical solution, the brake spring assembly includes an adjustment pin, an adjustment spring, and an adjustment nut. The adjustment pin is fixed to the upper brake pad, which is provided with a groove for the adjustment pin to be inserted. The adjustment spring is provided around the adjustment pin, and an adjustment nut is mounted on the upper portion of the adjustment pin. The braking force exerted by the adjustment spring on the upper and lower brake pads is adjusted by adjusting the nut up and down.

[0075] As an improvement to the above technical solution, the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer to constitute an extended end of the positioning plate.

[0076] As an improvement to the above technical solution, the positioning plate is provided with a torsion spring inside the brake groove, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide restoring force for the positioning plate.

[0077] As an improvement to the above technical solution, the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning wheel satisfies 90 degrees < angle ≤ 180 degrees.

[0078] The electric push rod can be used to brake the maximum rotation angle of the positioning plate. When the positioning component rotates with the drive shaft, the regulating pin touches the end of the C-shaped regulating slot, driving the positioning plate to rotate. When it rotates to the maximum angle, the electric push rod brakes the positioning plate, thereby controlling the maximum flip angle of the leg board. The maximum flip angle of the leg board can be adjusted through the first mechanical brake protection mechanism, thereby improving the leg exercise effect of the stretching chair.

[0079] The first photoelectric control mechanism comprises:

[0080] The first photoelectric switch sensor is fixedly arranged on the periphery of the positioning plate on one side; when the tensioning bar swings to the high position, the positioning assembly first blocks the first photoelectric switch sensor and sends a reverse signal, causing the driven connecting rod, the leg plate portion, and the leg plate connecting piece to swing downward in the opposite direction in coordination;

[0081] The second photoelectric switch sensor is fixedly arranged on the periphery of the other positioning plate; when the tensioning rod swings to the high position, if the positioning component blocks the first photoelectric switch sensor and does not send a reversal signal, the positioning component blocks the second photoelectric switch sensor, and sends a reversal signal before the mechanical brake, so that the driven connecting rod, the leg plate portion, and the leg plate connecting piece cooperate to swing downward in the opposite direction;

[0082] A third photoelectric switch sensor is provided on the frame; a first shielding piece is provided on the leg plate connecting member; when the lacing bar swings to a horizontal position, the leg plate connecting member swings down to shield the third photoelectric switch sensor, thereby sending a reverse signal, causing the driven link, the leg plate portion, and the leg plate connecting member to swing upward in the opposite direction in coordination;

[0083] The fourth photoelectric switch sensor is arranged on the frame; the second shielding piece is arranged on one side of the leg plate; during the retraction and extension swing, the leg plate swings from horizontal to vertical, and the second shielding piece blocks the fourth photoelectric switch sensor, sending a braking signal to stop the retraction and extension swing.

[0084] It should be noted that the first photoelectric switch sensor and the second photoelectric switch sensor can be arranged on one positioning plate, or respectively on two positioning plates, but they are slightly misaligned in spatial position, that is, the positioning pointer of the positioning component will first block the first photoelectric switch sensor during the upward swing process, and will block the second photoelectric switch sensor when the first photoelectric switch sensor fails. When the first photoelectric switch sensor and the second photoelectric switch sensor fail at the same time, the control pin of the positioning component touches the upper top of the C-shaped control groove of the positioning plate, and is mechanically braked by the first mechanical brake protection mechanism.

[0085] When the driving shaft drives the leg board to flip to the highest position and then rotates in the opposite direction by a certain angle, the first shielding piece will block the third photoelectric switch sensor. After receiving the signal from the third photoelectric switch sensor, the controller will drive the power motor to drive the driving shaft to rotate in the opposite direction again, driving the leg board to flip upward, thereby realizing the reciprocating stretching and swinging movement of the leg board.

[0086] When the stretching chair is stored in a folded state, the backboard and the legboard are in a vertical state. At this time, the second shielding member blocks the fourth photoelectric switch sensor. After receiving the signal, the controller stops the power motor and keeps the stretching chair in the folded state.

[0087] The first photoelectric switch sensor and the second photoelectric switch sensor output control signals when the positioning pointer blocks them; the third photoelectric switch sensor and the fourth photoelectric switch sensor output control signals when they are blocked by the first blocking piece and the second blocking piece respectively when they are in the low position.

[0088] The reciprocating swinging motion of the stretching bar is controlled by a first photoelectric switch sensor and a third photoelectric switch sensor. The first photoelectric switch sensor is located in front of the second photoelectric switch sensor. When the leg plate swings upward to the detection position of the first photoelectric switch sensor, the positioning pointer of the positioning assembly blocks the first photoelectric switch sensor. When the first blocking piece blocks the leg plate, the third photoelectric switch sensor outputs a control signal, causing the leg plate to swing upward when it swings downward to the detection position of the third photoelectric switch sensor.

[0089] The second photoelectric switch sensor is arranged in front of the mechanical brake limit position, so that the brake signal sent by the second photoelectric switch sensor precedes the mechanical brake and sends a reverse swing signal. The fourth photoelectric switch sensor outputs a brake signal when the second shielding piece is blocked, and the retraction and extension swing stops.

[0090] The above-mentioned safety mechanism of the present application realizes triple protection when in high position, namely, the first is the reverse swing control protection of the first photoelectric switch sensor, the second is the reverse swing control protection of the second photoelectric switch sensor in the event of control failure of the first photoelectric switch sensor, and the third is the mechanical braking protection of the first mechanical brake protection mechanism in the event of reverse protection failure of the second photoelectric switch sensor.

[0091] The first case of the triple protection safety mechanism of the present invention is two photoelectric switch sensors plus a first mechanical brake protection mechanism, which can set the reversing position of the user's normal stretching angle, the braking position after reversal failure, and the mechanical brake position of the maximum stretching angle respectively. Triple protection is used in the safety design of stretching training to prevent personal injury.

[0092] In the present invention, the first photoelectric switch sensor and the second photoelectric switch sensor are arranged on the opposite sides of the regulating pin shaft, and their positions are both before the mechanical brake position. The first photoelectric switch sensor is fixed on the positioning plate on one side of the fitness chair, and the second photoelectric switch sensor is fixed on the positioning plate on the other side of the fitness chair. The first photoelectric switch sensor is first blocked when the driving shaft swings upward, and sends a reverse swing signal to make the driving shaft swing in the reverse direction, forming the first level of protection for the fitness chair.

[0093] The second photoelectric switch is located between the mechanical brake and the first, operating before the mechanical brake but after the first. If the first loses control, the drive shaft continues to swing upward, blocking the second sensor and sending a reverse signal, causing the legrest to swing downward, providing a second layer of protection for the fitness chair.

[0094] If the first photoelectric switch sensor and the second photoelectric switch sensor lose control one after another, the drive shaft will swing upward again, driving the regulating pin on the positioning assembly to swing upward. When the regulating pin touches the end of the C-shaped regulating groove, a mechanical brake is applied to prevent it from exceeding the set maximum stretching angle, thus forming the third level of protection for the fitness chair.

[0095] The reversal of the fitness chair in the horizontal position is controlled by the third photoelectric switch sensor. The leg board connecting piece is provided with a swing shielding piece. When the leg board part swings down to the horizontal position, it shields the third photoelectric switch sensor and reverses the swing.

[0096] The working principle of the first mechanical brake protection mechanism is:

[0097] In the idle state, the electric push rod is in the retracted state, and the drum brake component is separated from the positioning plate.

[0098] When setting the maximum stretching angle, the positioning plate and the drum brake component are disengaged, and the positioning plate can rotate relative to the drum brake component. The drive shaft moves to cause the leg plate to swing from the horizontal upward, and the drive shaft drives the positioning plate to swing. The positioning plate drives the regulating pin to swing in the C-shaped regulating groove. When the regulating pin touches the end point of the C-shaped regulating groove, it drives the positioning plate to swing. When the leg plate swings to the maximum angle, that is, the maximum angle that the trainee can tolerate, the electric push rod extends, and the brake spring assembly acts to lock the positioning plate and the drum brake component, thereby setting the mechanical brake position.

[0099] During the swing of the stretching bar, the positioning plate and drum brake components in the first mechanical brake protection mechanism are in a braking state, and the drive shaft only drives the positioning assembly to swing. Due to the safety protection of the first photoelectric switch sensor and the second photoelectric switch sensor, the regulating pin will not touch the end point of the C-shaped regulating groove and will swing back and forth within the range limited by the C-shaped regulating groove.

[0100] After the reinforcement is stretched, the electric push rod is shortened, the positioning plate and the drum brake components are disengaged, the maximum angle limit is removed, the torsion spring acts on the positioning plate, and the positioning plate follows the positioning plate and the regulating pin is reset.

[0101] As an improvement to the above technical solution, the second mechanical brake protection mechanism includes

[0102] Electric cylinder, used to output safety braking force at the highest point of the lacing swing;

[0103] A positioning wheel is rotatably arranged on the outer end of the drive shaft, and a C-shaped regulating groove is provided on the inner side of the positioning wheel;

[0104] A support plate is fixedly arranged on the frame;

[0105] Two brake levers are provided on either side of the periphery of the positioning wheel and are pivotally connected to one side of the support plate via a support shaft. The lower ends of the two brake levers are hinged to the head and tail of the electric cylinder. When the electric cylinder retracts and contracts, the two brake levers swing open and close around the support shaft, causing the front ends of the brake levers to engage or disengage with the positioning wheel. The brake is applied when engaged and released when disengaged.

[0106] The positioning arm is mounted on the driving shaft. The positioning arm is provided with a positioning shaft which is embedded in the C-shaped regulating groove and moves along with the positioning arm.

[0107] The driving shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped control groove, it drives the positioning wheel to rotate in coordination. When the user stretches the muscles to the maximum angle, the electric cylinder applies force, the brake rod engages with the positioning wheel, and the positioning wheel is braked, completing the mechanical brake setting of the second mechanical brake protection mechanism.

[0108] As an improvement to the above technical solution, the positioning wheel is a positioning gear, the brake lever is a brake arm, and a rack is embedded in the front end of the brake arm, which meshes with the positioning gear during braking.

[0109] As an improvement to the above technical solution, a rope sheave is provided on the outside of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope sheave. The reset wire rope is connected to a cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

[0110] As an improvement to the above technical solution, the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

[0111] As an improvement to the above technical solution, the angle formed by the two end points of the C-shaped regulating groove and the center of the positioning plate satisfies 90 degrees < angle ≤ 180 degrees.

[0112] The second photoelectric control mechanism includes:

[0113] A fifth photoelectric switch sensor is provided at the top of the front side of the frame; a third shielding piece is provided at the rear of the leg plate; when the leg plate swings from horizontal to vertical during retraction and extension, the third shielding piece shields the fifth photoelectric switch sensor, sending a brake signal to stop the retraction and extension swing;

[0114] The sixth photoelectric switch sensor is arranged at the top of the middle part of the frame; when the tensioning rod swings to the horizontal position, the driven connecting rod blocks the sixth photoelectric switch sensor and sends a reverse signal, causing the driven connecting rod, the leg plate portion, and the leg plate connecting piece to swing upward in the opposite direction in coordination;

[0115] The seventh photoelectric switch sensor is arranged on a positioning wheel; when the tensioning arm swings to the high position, the positioning arm first blocks the seventh photoelectric switch sensor, sends a reverse signal, and causes the driven connecting rod, the leg plate portion, and the leg plate connecting member to swing downward in the opposite direction in coordination;

[0116] The eighth photoelectric switch sensor is arranged on the other side positioning wheel and is spatially offset from the seventh photoelectric switch sensor; when the stretching arm swings to the high position, if the seventh photoelectric switch sensor fails and does not send a reversal signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the driven connecting rod, leg plate part, and leg plate connecting part to swing downward in the opposite direction in coordination.

[0117] The above-mentioned safety mechanism is the second case of the safety mechanism with triple protection of the present invention. Through the combination of electric cylinder, positioning gear, C-shaped control groove, two brake rods, two racks, two photoelectric switch sensors (seventh photoelectric switch sensor, eighth photoelectric switch sensor), positioning arm and positioning shaft, it can set the three different functional positions of the reversing position of the highest point of the stretching swing, the safety braking position and the safety braking position of the maximum angle of the stretching, thereby realizing triple protection to ensure the safe use of the fitness chair.

[0118] The seventh and eighth photoelectric switches are both positioned before the mechanical brake position of the second mechanical brake protection mechanism. The seventh photoelectric switch, at the first obstructed position during the rotation of the positioning gear, acts as a reversing switch for the high point of the swaying bar. The swaying bar reverses direction after reaching its high point at this position. The eighth photoelectric switch, located between the seventh photoelectric switch and the mechanical brake position of the second mechanical brake protection mechanism, also acts as a reversing switch. If the seventh photoelectric switch fails and the drive shaft swings upward again, it issues a reversing signal, causing the driven link, leg plate, and leg plate connector to coordinately swing downward in the opposite direction.

[0119] The second mechanical brake protection mechanism is the final safety guarantee of the safety mechanism and is a safety brake guarantee in the event that both photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor) may all fail.

[0120] The second mechanical brake protection mechanism of the present invention completes the mechanical brake setting of the second mechanical brake protection mechanism through the combination of an electric cylinder, a positioning gear, a C-shaped regulating groove, two brake rods, two racks, a positioning arm, and a positioning shaft.

[0121] The specific setting of the second mechanical brake protection mechanism is that the two brake levers are opened, the rack of the brake lever is disengaged from the positioning gear, and the positioning shaft on the positioning arm swings in the C-shaped adjustment groove as the drive shaft swings, and when it touches the end point of the C-shaped adjustment groove, it drives the positioning gear to swing. At the maximum stretching angle that the user can bear, the two brake levers close toward each other, and the rack of the brake lever engages with the positioning gear to brake the drive shaft, thereby setting the mechanical brake position.

[0122] After the angle setting is completed, the equipment swings up and down according to the set number of stretching times; when the stretching is completed, the two brake levers are released, the braking force disappears, the reset wire rope pulls the positioning gear, follows the positioning shaft to reset, and then the drive shaft resets.

[0123] The above-mentioned safety mechanism realizes triple protection when in high position: first, the reverse swing control protection of the seventh photoelectric switch sensor; second, the reverse swing control protection of the eighth photoelectric switch sensor in the event of failure of the seventh photoelectric switch sensor control; and third, the mechanical braking protection of the second mechanical brake protection mechanism in the event of failure of the reverse swing control protection of the eighth photoelectric switch sensor.

[0124] Compared to the previous mechanical brake protection mechanism, this one features a simpler structure and easier operation, but its function remains the same: providing upper reversal and safety braking during stretching and swinging. Because the angle formed between the two endpoints of the C-shaped control slot and the center of the positioning plate satisfies the condition of 90 degrees < 180 degrees, the positioning shaft will not contact the endpoints of the C-shaped control slot during stretching, allowing it to reciprocate within the confines of the slot. This also allows the stretching chair to swing to a maximum angle of 180 degrees.

[0125] In actual use, the first mechanical brake protection mechanism and the second mechanical brake protection mechanism can be interchanged, and the corresponding first photoelectric control mechanism and the second photoelectric control mechanism are replaced accordingly, and their installation positions change with the changes of the first mechanical brake protection mechanism and the second mechanical brake protection mechanism.

[0126] The present invention also provides a working method of a fitness chair, which is characterized in that the working method comprises the following steps:

[0127] S1: The fitness chair is at rest, in the seating position, the clutch mechanism is engaged, the traction spring in the walking traction mechanism is stretched, and the traction spring is storing energy;

[0128] S2. The person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller;

[0129] S3. Click the power start button to energize the power motor, and the drive shaft drives the active connecting rod to swing, which pushes the leg plate to swing upward from vertical position through the driven connecting rod; at the same time, as the active connecting rod swings, the back plate loses its support, the traction spring stores energy and releases it, the second traction rope pulls the double-groove rope pulley to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turning off the power motor and stopping the swinging;

[0130] S4. Setting the maximum swing angle: After the user lies flat, the handle switch is toggled downward, and the power motor drives the active connecting rod to continue rotating, pushing the driven connecting rod, the leg plate connector, and the leg plate to swing upward in a coordinated manner; when the swing reaches the maximum angle that the user can withstand, the handle switch is immediately released, the power motor stops moving, and the confirmation button on the handle switch is clicked. The positioning disk or positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle;

[0131] S5. After locking the positioning disc or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake lever from the positioning gear.

[0132] S6. The positioning disc or positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connector, and the leg plate portion swing downward in a coordinated manner to a horizontal position, the power motor continues to rotate, and the leg plate portion and the back plate portion are transformed into a seat position. At the same time, the fitness chair moves backward to its initial position, and the positioning disc rotates back to its initial position along with the control pin or the positioning wheel along with the positioning shaft; the tension spring returns to its stretched state to store energy; and this stretching of the fitness chair is completed;

[0133] S7. If the fitness chair needs to be pushed, the clutch mechanism is disconnected to disengage the clutch mechanism from the walking traction mechanism. Compared with the existing technology, the advantages and positive effects of the present invention are:

[0134] The fitness chair of the present invention can be adjusted to three states according to the situation: sitting, lying, and stretching exercise training and rehabilitation, through the design of the movable mechanism between the frame and the leg panel and back panel. 1. When used in an ordinary household, the fitness chair can be placed against the wall to reduce the space occupied by the equipment. At this time, the leg panel and back panel are in a vertical state, the power source does not output power, and the fitness chair is folded into a seat state. 2. When the power source is working, the drive shaft drives the active connecting rod to perform a retracting and extending swinging action, and the active connecting rod drives the driven connecting rod to push the leg panel to swing around the pivot axis. The leg panel makes the first step of swinging to a horizontal state, driving the user's calf to swing to be flush with the user's thigh. At this time, if the fitness chair no longer swings upward and maintains this state, the user can lie flat on the fitness chair, and the fitness chair unfolds to a lying flat state. 3. The leg board of the fitness chair swings upward again and enters the stretching and swinging state. The user can use the power motor to drive the leg board to perform reciprocating stretching and swinging movements. Healthy people can complete stretching exercises, and paralyzed patients can lie on the fitness chair and use the movement of the leg board to drive the patient's legs to perform reciprocating motions, thereby achieving the leg rehabilitation exercise effect for paralyzed patients.

[0135] The upward swing angle of the leg plate is adjustable and can be adjusted according to different uses, making it suitable for a wide range of customer groups. The entire device has a simple structure and is easy to operate, effectively improving the stretching exercise effect of the fitness chair.

[0136] According to another aspect of the present invention, the present application provides two swing angle limiting braking protection mechanisms for use in situations where there are certain requirements for the rotation angle.

[0137] Rotating devices are a common component used extensively in mechanical engineering. Due to the specialized needs of certain operations, these devices need to limit their rotation angle. However, existing rotating devices typically rotate a target object 360 degrees around a specific target, which covers unnecessary rotation angles and is unsuitable for specialized operations.

[0138] A swing angle limiting braking protection mechanism, comprising:

[0139] A power motor is arranged on the frame and has a drive shaft for outputting swing power;

[0140] The positioning component is fixed on the outer end of the drive shaft.

[0141] The positioning plate is rotatably mounted on the outer end of the drive shaft.

[0142] Electric push rod; pivotally connected to the frame;

[0143] The positioning disc is provided with a brake groove, and a drum brake component is provided in the brake groove so that the drum brake component brakes the positioning disc; the drum brake component is hinged to the electric push rod, and the brake on the positioning disc is released when the electric push rod is shortened;

[0144] The positioning plate is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement;

[0145] The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the control pin to rotate through the positioning assembly, and when it touches the end of the C-shaped control slot, it drives the positioning plate to rotate in coordination. At the set swing angle position, the electric push rod extends, the drum brake component expands, and the positioning plate is mechanically braked.

[0146] As an improvement to the above technical solution, the drum brake component includes:

[0147] The brake sleeve has an oval outer circumference and is rotatably mounted on the drive shaft.

[0148] The brake plate is fixed on the brake sleeve.

[0149] The upper brake pad and the lower brake pad are arranged on the periphery of the brake sleeve and are hinged to each other at one end through a limit pin;

[0150] The upper brake pad and the lower brake pad are provided with brake spring assemblies on the opposite sides of the hinged end to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin shaft is hinged to the drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

[0151] As an improvement to the above technical solution, the brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut. The adjusting pin is fixed on the upper brake pad, and the lower brake pad is provided with a groove for the adjusting pin to be embedded. The periphery of the adjusting pin is provided with an adjusting spring, and an adjusting nut is installed on the upper part of the adjusting pin to compress the adjusting spring.

[0152] As an improvement to the above technical solution, the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer to constitute an extended end of the positioning plate.

[0153] As an improvement to the above technical solution, the positioning plate is provided with a torsion spring inside the brake groove, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide restoring force for the positioning plate.

[0154] As an improvement to the above technical solution, there are two power motors, and correspondingly, there are two sets of positioning components, positioning plates, and electric push rods;

[0155] A first photoelectric switch sensor is fixedly provided on the periphery of a positioning plate. When the driving shaft swings upward, the positioning assembly blocks the first photoelectric switch sensor before the mechanical brake, and sends a reversal signal to make the driving shaft swing downward.

[0156] A second photoelectric switch sensor is fixedly provided on the periphery of the other positioning plate. When the drive shaft swings upward, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction.

[0157] Another swing angle limiting braking protection mechanism provided by the present application includes:

[0158] A power motor is arranged on the frame and has a drive shaft for outputting swing power;

[0159] Electric cylinder, used to output safety braking force at the high point of the swing;

[0160] A positioning wheel is rotatably arranged on the outer end of the drive shaft, and a C-shaped regulating groove is provided on the inner side of the positioning wheel;

[0161] A support plate is fixedly arranged on the frame;

[0162] Two brake levers are provided on either side of the periphery of the positioning wheel and are pivotally connected to one side of the support plate via a support shaft. The lower ends of the two brake levers are hinged to the head and tail of the electric cylinder. When the electric cylinder retracts and contracts, the two brake levers swing open and close around the support shaft, causing the front ends of the brake levers to engage or disengage with the positioning wheel. The brake is applied when engaged and released when disengaged.

[0163] The positioning arm is fixedly mounted on the driving shaft. The positioning arm is provided with a positioning shaft which is embedded in the C-shaped regulating groove and moves along with the positioning arm.

[0164] The drive shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped control groove, it drives the positioning wheel to rotate in coordination; when the electric cylinder applies force, the brake rod engages with the positioning wheel, braking the positioning wheel and setting the maximum swing angle of the drive shaft.

[0165] As an improvement to the above technical solution, the positioning wheel is a positioning gear, the brake lever is a brake arm, and a rack is embedded in the front end of the brake arm, which meshes with the positioning gear during braking.

[0166] As an improvement to the above technical solution, a rope sheave is provided on the outside of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope sheave. The reset wire rope is connected to a cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

[0167] As an improvement to the above technical solution, the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

[0168] As an improvement to the above technical solution, there are two power motors, and two sets of corresponding electric cylinders, positioning gears, and positioning arms;

[0169] A seventh photoelectric switch sensor is provided on a positioning wheel. When the drive shaft swings upward to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reversal signal, causing the drive shaft to swing downward in the opposite direction.

[0170] An eighth photoelectric switch sensor is provided on the other positioning gear and is spatially offset from the seventh photoelectric switch sensor. When the drive shaft swings upward to a high position, if the seventh photoelectric switch sensor fails and does not send a reverse signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor, sending a reverse signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction.

[0171] In the above two swing angle limiting braking protection mechanisms, the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning gear satisfies 90 degrees < angle ≤ 180 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0172] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the embodiments or the prior art are described below.

[0173] The accompanying drawings required for use are briefly introduced. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0174] FIG1 is a schematic structural diagram of the fitness chair of Example 1 in a seated state;

[0175] FIG2 is a structural diagram of the fitness chair of Example 1 in an unfolded state;

[0176] FIG3 is a schematic diagram of the connection structure of the connecting rod mechanism, the back panel, and the leg panel in the seat state in Example 1;

[0177] FIG4 is a schematic diagram of the connection structure of the connecting rod mechanism, the back plate portion, and the leg plate portion in the unfolded state in Example 1;

[0178] FIG5 is a schematic structural diagram of the position limiting assembly in Example 1 in a folded state;

[0179] FIG6 is a schematic structural diagram of the position limiting assembly in the expanded state in Example 1;

[0180] FIG7 is a schematic structural diagram of the first mechanical brake protection mechanism in Example 1 viewed from the outside to the inside;

[0181] FIG8 is a schematic structural diagram of the first mechanical brake protection mechanism in Example 1 viewed from the outside;

[0182] Figure 9 is a schematic structural diagram of the short shaft of the brake sleeve acting on the upper brake pad and the lower brake pad in Example 1;

[0183] Figure 10 is a schematic structural diagram of the long axis of the brake sleeve acting on the upper brake pad and the lower brake pad in Example 1;

[0184] FIG11 is a schematic cross-sectional view of the brake spring assembly in Example 1;

[0185] FIG12 is a schematic diagram of the installation structure of the walking traction mechanism in Example 1;

[0186] FIG13 is a schematic structural diagram of the clutch mechanism in Example 1;

[0187] FIG14 is a schematic diagram of the three-dimensional structure of the clutch mechanism of Example 1;

[0188] FIG15 is a schematic diagram of the three-dimensional structure of the walking mechanism of Example 1;

[0189] FIG16 is a schematic diagram of the connection structure of the tension spring and the guide wheel assembly of Example 1;

[0190] FIG17 is a schematic diagram of the frame structure of the fitness chair of Example 2;

[0191] FIG18 is a schematic structural diagram of the fitness chair of Example 2 in the sitting position;

[0192] FIG19 is a schematic structural diagram of the fitness chair of Example 2 in an unfolded state;

[0193] FIG20 is a schematic diagram of the connection structure of the connecting rod mechanism, the back plate portion, and the second mechanical brake protection mechanism of Example 2;

[0194] FIG21 is a schematic diagram of the installation structure of the second mechanical brake protection mechanism of Example 2;

[0195] FIG22 is a schematic diagram of the composition structure of the second mechanical brake protection mechanism of Example 2;

[0196] FIG23 is a schematic diagram of the structure of the second mechanical brake protection mechanism of Example 2 viewed from another angle;

[0197] FIG24 is a schematic diagram of the installation structure of the photoelectric control mechanism of Example 2;

[0198] FIG25 is a flowchart of the workflow control of the fitness chairs of Embodiments 1 and 2.

[0199] Reference numerals: 1, frame; 3, walking traction mechanism; 4, clutch mechanism; 5, power motor; 6, connecting rod mechanism; 7, first mechanical brake protection mechanism; 8, second mechanical brake protection mechanism;

[0200] 101. Seat; 102. Base frame; 103. Side frame; 104. Seat support frame; 105. Motor fixing plate; 106. Protection plate; 107. Backboard support plate;

[0201] 201, backboard; 203, legboard; 204, backboard mounting member; 205, legboard connecting member; 206, legboard mounting member; 207, legboard connecting shaft; 208, limit spring; 209, fourth photoelectric switch sensor; 2041, gear groove; 2051, limit block;

[0202] 301, pulling spring; 302, second pulling rope; 303, first pulling rope; 304, double-groove rope pulley; 305, driving shaft; 306, driving travel wheel; 307, driven travel wheel; 308, guide wheel assembly; 309, rear bracket; 310, front bracket; 311, spring connecting plate; 312, spring seat plate; 313, first guide wheel; 314, second guide wheel; 315, third guide wheel; 316, fourth guide wheel;

[0203] 401, hand crank; 402, eccentric wheel; 403, clutch mounting bracket; 404, movable connecting rod; 405, first coupling member; 406, second coupling member; 407, clutch sleeve; 408, limit sleeve; 409, return spring;

[0204] 501, drive shaft;

[0205] 601, active connecting rod; 602, driven connecting rod; 603, protective cover; 604, second limit block; 6011, first limit block; 6012, shift pin; 6013, shaft pin; 6014, bearing; 6015, pivot pin;

[0206] 701, positioning plate; 702, electric push rod; 703, positioning assembly; 705, brake plate; 706, drum brake support plate; 707, limit pin; 708, upper brake pad; 709, lower brake pad; 710, brake bushing; 711, torsion spring; 712, brake spring assembly; 714, reset pin; 7011, 807, C-shaped control slot, 7031, control pin; 7032, positioning pointer; 7122, adjustment pin; 7123, adjustment spring; 7124, adjustment nut.

[0207] 801, electric cylinder; 802, positioning gear; 803, support plate; 804, brake lever; 805, rack; 806, positioning arm; 808, wire rope; 809, cylindrical thread tension spring; 810, steering wheel;

[0208] 901, first photoelectric switch sensor; 902, second photoelectric switch sensor; 903, first blocking piece; 904, third photoelectric switch sensor; 905, fourth photoelectric switch sensor, 906, second blocking piece; 907, fifth photoelectric switch sensor; 908, third blocking piece; 909, sixth photoelectric switch sensor; 910, seventh photoelectric switch sensor. DETAILED DESCRIPTION

[0209] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0210] Example 1

[0211] As shown in Figures 1 to 16, this embodiment 1 provides a fitness chair, comprising:

[0212] The frame 1 includes a horizontally fixed seat 101, which provides support for the user to lie down or sit;

[0213] A power source fixed to the frame 1 for outputting power; providing working power for the fitness chair of this application;

[0214] A movable mechanism that completes retraction and extension swing and stretching swing under the drive of a power source;

[0215] A traveling mechanism for moving the frame 1 under the drive of a power source;

[0216] A safety mechanism that provides triple protection for the user during stretching and swinging;

[0217] The walking mechanism includes a walking traction mechanism 3 for driving the frame 1 to move, and a clutch mechanism 4 for separating and engaging the walking traction mechanism 3 and the frame;

[0218] The safety mechanism includes a photoelectric control mechanism and a mechanical brake protection mechanism; the photoelectric control mechanism includes a first photoelectric control mechanism or a second photoelectric control mechanism, and the corresponding mechanical brake protection mechanism is a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8.

[0219] The frame 1 comprises a seat 101, a base frame 102, side frames 103 disposed on either side of the base frame 102, and a seat support frame 104 located between the two side frames 103. The base frame 102, side frames 103, and seat support frame 104 form a frame structure, with the side frames 103 disposed vertically. The seat 101 is fixed to the seat support frame 104 and located between the two side frames 103. A motor fixing plate 105 is disposed inside the side frames 103 to secure and support the power source. Protective plates 106 are provided on the upper, front, rear, and outer sides of the side frames 103, enclosing the power source within the structure formed by the side frames 103, motor fixing plate 105, and protective plates 106 to ensure user safety. A backboard support plate 107 is provided at the rear of the frame 1 to support the backboard when it swings downward to a horizontal position.

[0220] The power source is a power motor 5 with a built-in reducer, and the power motor 5 has a drive shaft 501. Functionally, the drive shaft 501 can be a single output shaft or a dual output shaft, which is suitable for the fitness chair of this application. However, based on installation considerations, the power motor 5 selected in this application has a dual output shaft. This allows the safety mechanism and the movable mechanism to be installed on the output shaft at different output ends respectively, avoiding the safety mechanism and the movable mechanism being installed densely on one end of the output shaft.

[0221] Two power motors 5 are located within the frame structures of the two side frames 103 and fixedly connected to the motor mounting plate 105. One output end of the drive shaft 501 extends from an opening in the motor mounting plate 105 and faces the center of the seat 101, for mounting the movable mechanism. The other output end extends away from the seat 101 but within the enclosed structure of the side frames 103, for mounting the safety mechanism. The power motors 5 have their own reducers and are the power source for the fitness chair of this invention.

[0222] The movable mechanism includes a back plate portion, a leg plate portion, a connecting rod mechanism 6, and a leg plate connector 205.

[0223] The leg plate portion is composed of a leg plate 203 and leg plate mounting parts 206 arranged above the left and right sides of the leg plate 203.

[0224] The linkage 6 comprises an active link 601 and a passive link 602. One end of the active link 601 is fixedly connected to the drive shaft 501, while the other end of the active link 601 is provided with a pivot pin pivotally connected to one end of the transmission link 602. The other end of the passive link 602 is pivotally connected to the leg panel mounting member 206. During retraction and extension, the active link 601 acts only on the leg panel through the passive link 602, causing the leg panel to swing from vertical to horizontal or from horizontal to vertical.

[0225] One end of the leg plate connecting member 205 is pivotally connected to the driving shaft 501 , and the other end is pivotally connected to the leg plate 203 via the leg plate connecting shaft 207 .

[0226] A first limit block 6011 is provided at the far end of the active connecting rod; during the stretching swing, the top of the first limit block 6011 conflicts with the lower bottom surface of the driven connecting rod 602. At this time, the active connecting rod 601 and the driven connecting rod 602 do not move with each other, so that the driven connecting rod 602 only supports the leg plate part and no longer applies force to the leg plate 203. The active connecting rod 601 pushes the driven connecting rod 602, the leg plate mounting part 206, the leg plate 203, and the leg plate connecting part 205 to move in coordination, and perform the stretching swing from horizontal to high position and then from high position to horizontal.

[0227] In this embodiment, the back plate portion is composed of a back plate 201 and back plate mounting members 204 provided below the left and right sides of the back plate 201. The back plate portion is rotatably connected to the drive shaft 501 through the back plate mounting members 204. A shift groove 2041 is provided below the back plate mounting member 204. A shift pin 6012 is provided on the left side of the other end of the active connecting rod 601 and engages with the shift groove 2041 provided at the bottom of the back plate mounting member 204 through the shift pin 6012. When the back plate 201 is in a vertical state, the shift pin 6012 is located in the shift groove 2041. When the back plate 201 is transformed into a horizontal state, the active connecting rod 601 drives the shift pin 6012 to rotate downward, and the back plate 201 rotates downward under the action of gravity and gradually transforms into a horizontal state. When the back plate 201 is in a vertical state, the shift pin 6012 is located in the shift groove 2041. When the back plate 201 is in a horizontal state, the active connecting rod 601 drives the shift pin 6012 to rotate downward, and the back plate 201 rotates downward under the action of gravity and gradually transforms into a horizontal state. When 201 is in a horizontal state, the back panel 201 is placed on the frame 1, and is supported and limited by the back panel support plate 107 provided at the rear of the frame 1, and no longer swings downward, and the shift pin 6012 swings along with the active connecting rod 601 and comes out of the shift groove 2041; the back panel 201 and the back panel mounting member 204 constitute the back panel part, of course, the back panel part can be an integrated component, and the back panel 201 and the back panel mounting member 204 are made into separate parts here for the convenience of installation and maintenance. If the back panel mounting member 204 is worn during use, it can be easily replaced.

[0228] The leg plate portion is composed of a leg plate 203 and a leg plate mounting member 206 arranged above the left and right sides of the leg plate 203. The leg plate 203 is located on the front side of the seat 101. The leg plate 203 is provided with a leg plate connecting shaft 207 (pivot shaft) on both sides of the end near the seat 101. The leg plate connecting shaft 207 is pivotally connected to one end of the leg plate connecting member 205 through the leg plate connecting shaft 207. The other end of the leg plate connecting member 205 is rotatably connected to the drive shaft 501. A limit assembly is provided between the leg plate mounting member 206 and the leg plate connecting member 205. There is power transmission between the leg plate mounting member 206 and the connecting rod mechanism 6 and the leg plate 203. The power of the drive shaft 501 is transmitted to the leg plate 203 by the connecting rod mechanism 6 and the leg plate mounting member 206. Similarly, the leg plate portion can also be an integrated component. Here, the leg plate 203 and the two leg plate mounting members 206 are made into separate parts for easy installation and maintenance. At the same time, the arrangement of the leg plate mounting member allows the leg plate portion and the driven connecting rod to form a larger lever arm.

[0229] The limiting assembly includes a first limiting pin, a second limiting pin, a limiting block 2051, and a limiting tension spring 208. The first limiting pin is arranged on the two outer sides of the end of the leg plate connecting member 205 near the leg plate connecting shaft 207, and the second limiting pin is arranged on the two outer sides of the top of the leg plate mounting member 206. The limiting tension spring 208 is connected between the first and second limiting pins. The limiting block 2051 is arranged on the two inner sides of the end of the leg plate connecting member 205 near the leg plate connecting shaft 207. When the leg plate 203 is horizontal, the heights of the first and second limiting pins are both higher than the height of the leg plate connecting shaft 207, and the bottom edge of the end of the leg plate 203 near the leg plate connecting shaft 207 abuts the upper end of the limiting block 2051. The limiting tension spring 208 tensions the leg plate portion and the leg plate connecting member.

[0230] When the power motor drives the connecting rod mechanism to move, the leg plate part rotates around the leg plate connecting shaft 207 to a horizontal state. At this time, under the action of the limit spring 208 and the limit block 2051, a stable structure is formed between the leg plate 203 and the leg plate connecting member 205. As the connecting rod mechanism continues to move, the leg plate 203 no longer rotates around the leg plate connecting shaft 205, but rotates around the drive shaft 501 together with the leg plate connecting member 205, thereby realizing the stretching and swinging action of the leg plate 203.

[0231] The fitness chair of the present invention has two kinds of motion and three states:

[0232] When power begins to be output, the active connecting rod 601 drives the driven connecting rod 602, causing the leg panel to rotate about the leg panel connecting shaft 207, i.e., the pivot axis, and perform a retractable and extendable swing. The leg panel swings upward from a vertical position in a static state to a horizontal position, and the corresponding back panel simultaneously swings downward from a vertical position to a horizontal position. The leg panel and leg panel of the fitness chair open to form a bed. When the leg panel swings downward from a horizontal position to a vertical position in a static state, the corresponding back panel simultaneously swings upward from a horizontal position to a vertical position, and the fitness chair returns to a seat position. The leg panel and back panel rotate from vertical to horizontal, and then from horizontal to vertical, forming a retractable and extendable swinging action cycle.

[0233] When stretching is required, the power motor outputs power, driving the active connecting rod through the driven connecting rod, causing the driven connecting rod, the leg plate portion, and the leg plate connecting member 205 to rotate about the drive shaft and swing upward. When the swing reaches the highest position, the power is output in the reverse direction, causing the driven connecting rod, the leg plate portion, and the leg plate connecting member 205 to rotate about the drive shaft and swing downward. The driven connecting rod, the leg plate portion, and the leg plate connecting member 205 swing upward from the horizontal position to the high position of stretching, and then swing downward to the horizontal position, forming a stretching and swinging movement cycle.

[0234] The first state is the seat state, which is the initial state of the fitness chair. In this state, the fitness chair is stationary, with no power output, and the leg and back panels are naturally vertical. This state is the storage state after use and is also the starting and ending state of the fitness chair's retractable and swinging state.

[0235] The second position is the bed position, in which the leg and back panels are open, turning from vertical to horizontal, and aligning with the seat panel. This position marks the end of the retraction and extension swing at its highest point and the beginning of the stretching swing at its lowest point, marking the transition between the retraction and extension swings and the stretching swings.

[0236] The third state is the high position state of the stretching swing. In this position, the stretching swings upward to a high position, and then switches to swing downward.

[0237] The walking traction mechanism 3 of this embodiment includes a driving shaft 305, a driven walking wheel 307, a double-groove pulley 304, a first pulling rope 303, a second pulling rope 302, and a pulling spring 301; wherein the driving shaft 305 is rotatably connected to the rear side of the frame 1, and the two ends of the driving shaft 305 are connected to the driving walking wheel 306; the front side of the frame 1 is connected to the driven walking wheel 307.

[0238] The double-groove pulley 304 is set on the driving shaft 305, one end of the first pulling rope 303 is wrapped in one of the rope grooves of the double-groove pulley 304, and the other end passes through the guide wheel assembly 308 set at the right end of the frame 1 and is connected to the bottom of the left end of the back plate 201. One end of the second pulling rope 302 is wrapped in the other rope groove of the double-groove pulley 304, and the other end is wrapped around the guide wheel assembly 308 in the opposite direction of the action of the first pulling rope 303. One end of the pulling spring 301 is fixedly connected to the rear end of the frame 1, and the other end is connected to the guide wheel assembly 308; when the back plate 201 is in a vertical state, the pulling spring 301 is in a stretched and pre-tightened state.

[0239] The walking traction mechanism of this embodiment adds a guide wheel assembly 308, so that the guide wheel assembly 308 of this application is suitable for use in smaller spaces such as fitness chairs. The second pulling rope 302 passes through the guide wheel assembly 308 and can pull the fitness chair away from its placement position with a smaller pulling distance.

[0240] When the fitness chair is in the storage state, the back panel can be placed against the wall. When the fitness chair needs to be unfolded, the power motor drives the active connecting rod to rotate, and the back panel flips downward under the action of gravity. At this time, the traction spring contracts under the elastic action, and its contraction drives the second traction rope to move. The second traction rope pulls the double-groove rope pulley and the active shaft to rotate, and the active shaft drives the active walking wheel to move forward, so that the fitness chair leaves the wall and makes room for the back panel to unfold. At the same time, the rotation of the double-groove rope pulley causes the first traction rope to be wound around the double-groove rope pulley in a plurality of turns.

[0241] When the fitness chair needs to be stored, the power motor drives the active connecting rod to rotate in the opposite direction, and the backboard changes from a horizontal state to a vertical state under the action of the active connecting rod. During the swinging process of the backboard, the first pulling rope is pulled out through the double-groove pulley, and the first pulling rope pulls the double-groove pulley and the active shaft to rotate in the opposite direction. The active shaft drives the active walking wheel to move backward, so that the fitness chair is close to the wall, realizing the automatic storage and placement of the fitness chair; at the same time, the rotation of the double-groove pulley will cause the second pulling rope to pull the pulling spring again, so that the pulling spring is in a stretched and pre-tightened state again, which is convenient for the fitness chair to perform the next retraction and deployment action.

[0242] The guide wheel assembly 308 includes a front bracket 310 fixed to the front end of the frame 1, a spring connecting plate 311 connected to the pulling spring 301, and a spring seat plate 312 pivotally connected to the spring connecting plate 311; the spring connecting plate 312 is pivotally connected in parallel to a first guide wheel 313 and a second guide wheel 314, and the front bracket 310 is pivotally connected in parallel to a third guide wheel 315 and a fourth guide wheel 316, and the fourth guide wheel 316 is a double wheel; the first pulling rope 303 is wrapped around one of the fourth guide wheels 316 and then The second pulling rope 302 is wound in the rope groove of the double-grooved rope pulley 304, one end of which is connected to the front bracket 310, and then wound around the other one of the second guide wheel 314, the third guide wheel 315, the first guide wheel 313, and the fourth guide wheel 316, and then wound in the other rope groove of the double-grooved rope pulley 304 and in the opposite direction of the pulling direction of the first pulling rope; one end of the pulling spring 301 is hung on the spring connecting plate 311, and the other end is hung on the rear bracket 309 and fixedly connected to the rear end of the frame 1 through the rear bracket 309.

[0243] The multi-wheel combination structure of the guide wheel assembly 308 is a labor-saving mechanism, which enables the first pulling rope and the second pulling rope to pull the fitness chair to move with less force.

[0244] The clutch mechanism 4 is arranged on the driving shaft 305, located on one side of the double-groove rope pulley 304; it includes a first coupling member 405, a second coupling member 406, a return spring 409, and a limit sleeve 408; the double-groove rope pulley 304 is rotatably connected to the driving shaft 305 through a bearing, and one side of the double-groove rope pulley 304 is fixedly connected to the first coupling member 405, and the first coupling member 405 is rotatably sleeved on the outside of the driving shaft 305; the side of the first coupling member 405 away from the double-groove rope pulley 304 is provided with a second coupling member 406, and the second coupling member 406 is sleeved on the outside of the driving shaft 305, and the second coupling member 406 is sleeved on the outside of the driving shaft 305. The part 406 is key-connected to the driving shaft 305 so that the second coupling part 406 slides along the length direction of the driving shaft 305. A limiting sleeve 408 is provided on the side of the second coupling part 406 away from the first coupling part 405. The limiting sleeve 408 is fixedly connected to the outside of the driving shaft 305. The return spring 409 is sleeved on the outside of the driving shaft 305 and the return spring 409 is located between the second coupling part 406 and the limiting sleeve 408. The second coupling part 406 is engaged with the first coupling part 405 under the squeezing action of the return spring 409; the second coupling part 406 is connected to the frame 1 through the switch assembly.

[0245] The switch assembly includes a clutch mounting frame 403, an eccentric wheel 402, a hand crank 401, a movable connecting rod 404, and a clutch sleeve 407. The clutch mounting frame 403 is fixedly connected to the frame body 1, the eccentric wheel 402 is rotatably connected to the clutch mounting frame 403, and the eccentric wheel 402 is fixedly connected to the hand crank 401. The middle part of the movable connecting rod 404 is pivotally connected to the pin of the clutch mounting frame 403, one end of the movable connecting rod 404 abuts against the bottom end of the eccentric wheel 402, and the bottom of the other end of the movable connecting rod 404 is connected to the clutch sleeve 407. The clutch sleeve 407 is sleeved on the outside of the second coupling member 406 and can push the second coupling member 406 to slide toward the limit sleeve 408.

[0246] The eccentric wheel is rotated by the hand crank to squeeze one end of the movable connecting rod, and the other end of the movable connecting rod pushes the second coupling member in the direction away from the first coupling member through the clutch sleeve. The first coupling member and the second coupling member are in a disconnected state, that is, the power transmission between the double-groove rope pulley and the driving shaft is disconnected. At this time, people can push the fitness chair to move freely; when the double-groove rope pulley needs to be reconnected with the driving shaft, it is only necessary to rotate the eccentric wheel in the opposite direction, the movable connecting rod no longer pushes the clutch sleeve, and under the action of the reset spring, the second coupling member is re-engaged with the first coupling member, and the forward and backward effects of the walking traction mechanism are realized again.

[0247] The safety mechanism of this embodiment 1 includes a photoelectric control mechanism and a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8. Both the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 can be used in this embodiment 1 to provide safety for the fitness chair. The first mechanical brake protection mechanism 7 will be described first, and the second mechanical brake protection mechanism 8 will be described in the second embodiment. The photoelectric control mechanism of this embodiment is the first photoelectric control mechanism.

[0248] In this embodiment, the first mechanical brake protection mechanism 7 is disposed outside the power motor 5 and is fixedly connected to the frame 1 via a drum brake support plate 706 .

[0249] The first mechanical brake protection mechanism 7 includes a positioning assembly 703 fixedly mounted on the outer end of the drive shaft 501, a positioning plate 701 rotatably sleeved on the outer end of the drive shaft 501, and an electric push rod 702 pivotally connected to the frame 1; the positioning plate 701 is provided with a brake groove and a drum brake component is provided in the brake groove so that the drum brake component brakes the positioning plate 701, and the drum brake component is hingedly connected to the electric push rod 702 so as to release the brake when the electric push rod 702 applies force;

[0250] The positioning disk 701 is provided with a C-shaped control slot 7011 on the side opposite to the positioning assembly 703. The angle formed between the two end points of the C-shaped control slot 7011 and the center of the positioning disk satisfies the condition of 90 degrees < angle ≤ 180 degrees. The maximum angle of the C-shaped control slot 7011 is set to 180 degrees, even if the maximum swing angle of the positioning assembly 703 is 180 degrees. The positioning assembly 703 has a control pin 7031, which is embedded in the C-shaped control slot 7011 and rotates. When the drum brake component is engaged, the positioning disk 701 remains stationary, but when it touches the end of the C-shaped control slot 7011, it drives the positioning disk 701 to rotate in coordination. When the user stretches at the maximum angle, the electric push rod 702 extends, causing the drum brake component to brake the positioning disk 701, thereby forming the mechanical brake setting of the first mechanical brake protection mechanism.

[0251] The drum brake component includes an elliptical brake sleeve 710 rotatably arranged on the drive shaft 501, a brake plate 705 fixedly arranged on the brake sleeve 701, an upper brake pad 708 and a lower brake pad 709 arranged on the periphery of the brake sleeve 710 and hinged to each other at one end by a limit pin 707, and the upper brake pad 708 and the lower brake pad 708 are provided with a brake spring assembly 712 on the opposite side of the hinged end to provide braking force for the upper brake pad 708 and the lower brake pad 709, and the brake plate 705 is hinged to the electric push rod 702; the limit pin 707 is hinged to the drum brake support plate 706, and the drum brake support plate 706 is fixedly connected to the frame 1.

[0252] The brake spring assembly 712 includes an adjustment pin 7122, an adjustment spring 7123, and an adjustment nut 7124. The adjustment pin 7122 is fixed to the upper brake pad 708. The lower brake pad 709 is provided with a groove for the adjustment pin 7122 to be inserted. The adjustment spring 7124 is provided around the adjustment pin 7122. The adjustment nut 7124 is mounted above the adjustment pin 7122 to compress the adjustment spring. The braking force exerted by the adjustment spring 7123 on the upper and lower brake pads 708 and 709 is adjusted by adjusting the vertical position of the adjustment nut 7124.

[0253] The positioning assembly 703 includes a positioning plate, and the regulating pin 7031 is arranged on the positioning plate; on the opposite side of the regulating pin 7031, the positioning plate is provided with a positioning pointer 7032 to constitute an extended end of the positioning plate.

[0254] The positioning plate 701 is provided with a torsion spring 711 inside the brake groove. One end of the torsion spring 711 is fixedly connected to the upper brake pad 708 or the lower brake pad 709, and the other end is hooked to the reset pin 714 on the positioning plate 701 to provide a restoring force for the positioning plate 701.

[0255] The electric push rod can control the swing of the positioning plate, thereby changing the position of the C-shaped regulating groove. When the positioning component rotates with the drive shaft, the regulating pin will move in the C-shaped regulating groove. When the regulating pin touches the end of the C-shaped regulating groove, the positioning component and the drive shaft can no longer swing, and the drive shaft rotates in the opposite direction. It realizes the maximum rotation range of the drive shaft, thereby controlling the maximum flip angle of the leg board. The maximum flip angle of the leg board can be adjusted through the first mechanical brake protection mechanism, thereby improving the leg exercise effect of the fitness chair.

[0256] The first photoelectric control mechanism comprises:

[0257] The first photoelectric switch sensor 901 is fixedly arranged on the periphery of the positioning plate 701 on one side; when the positioning pointer 7032 blocks the first photoelectric switch sensor 901, a reverse signal is sent to make the driven connecting rod, the leg plate portion, and the leg plate connecting member cooperate to swing upward in the opposite direction;

[0258] The second photoelectric switch sensor 902 is fixedly arranged on the periphery of another positioning plate 701; during the stretching swing, if no reversal signal is issued when the positioning pointer 7032 blocks the first photoelectric switch sensor 901, a reversal signal is issued when the positioning pointer 7032 blocks the second photoelectric switch sensor 903, causing the drive shaft to swing downward in the opposite direction.

[0259] It should be noted that the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 can be set on one positioning plate 701 as shown in Figure 8, or can be set on two positioning plates 701 respectively. Figure 8 shows that the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are set on one positioning plate 701, which is relatively compact in space. However, from another perspective, it appears simpler if the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are installed on different positioning plates.

[0260] Although the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are installed on different positioning plates, their spatial positions are the same as those set on one positioning plate, that is, the positioning pointer 7032 will first block the first photoelectric switch sensor 901 during the upward swing process, and will block the first photoelectric switch sensor 902 when the first photoelectric switch sensor 901 fails. When the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 fail at the same time, the regulating pin 7031 touches the upper top of the C-shaped regulating groove 7011 of the positioning plate 701 and is mechanically braked by the first mechanical brake protection mechanism.

[0261] The third photoelectric switch sensor 904 is provided on the frame, and the first shielding piece 903 is provided on the leg plate connecting member 205. During the stretching swing, when the leg plate connecting member 205 swings down and blocks the third photoelectric switch sensor 904, a reversal signal is generated, causing the leg plate portion and the leg plate connecting member 205 to swing upward in the opposite direction in coordination.

[0262] When the driving shaft drives the leg board to flip to the highest position and then rotates in the opposite direction by a certain angle, the first blocking piece 903 will block the third photoelectric switch sensor 904. After receiving the signal from the third photoelectric switch sensor 904, the controller will drive the power motor to drive the driving shaft to rotate in the opposite direction again, driving the leg board to flip upward, thereby realizing the reciprocating stretching and swinging action of the leg board.

[0263] The fourth photoelectric switch sensor 905 is set on the frame, and the second blocking piece 906 is set on the inner side of the leg board mounting part 206; during the retraction and extension swing, the leg board part swings down, and its leg board mounting part 206 swings down. When the second blocking piece 906 blocks the fourth photoelectric switch sensor 905, a braking signal is sent to stop the retraction and extension swing, and the controller stops the power motor 5 from rotating, and the fitness chair returns to a stationary state.

[0264] When the fitness chair is stored in a folded state, the backboard and the legboard are in a vertical state. At this time, the second shielding member blocks the fourth photoelectric switch sensor. After receiving the signal, the controller stops the power motor and keeps the fitness chair in the folded state.

[0265] The first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 output control signals when blocked by the positioning pointer 7032; the third photoelectric switch sensor 904 and the fourth photoelectric switch sensor 905 output control signals when blocked by the first blocking piece 903 and the second blocking piece 906 at the low position.

[0266] The reciprocating stretching and swinging motion is controlled by the first photoelectric switch sensor 901, the second photoelectric switch sensor 902, and the third photoelectric switch sensor 904. The first photoelectric switch sensor is located in front of the second photoelectric switch sensor, causing the leg plate to swing downward when the upward stretching swing reaches the detection position of the first photoelectric switch sensor. The third photoelectric switch sensor 904 outputs a control signal when blocked by the first shielding piece 903, causing the leg plate to swing upward when it swings downward to the detection position of the third photoelectric switch sensor.

[0267] The second photoelectric switch sensor 902 is positioned opposite the mechanical brake limit position, so that the brake signal emitted by the second photoelectric switch sensor precedes the mechanical brake, and the brake signal is emitted when the positioning pointer 7032 is blocked by the upward swing. The fourth photoelectric switch sensor 905 emits a reverse signal when the second blocking piece 906 is blocked, causing the drive shaft to swing downward in the opposite direction.

[0268] The above-mentioned safety mechanism of the present application realizes triple protection when in high position, the first is the reverse swing control protection of the first photoelectric switch sensor 901, the second is the braking protection of the second photoelectric switch sensor 902 in the event of control failure of the first photoelectric switch sensor 901, and the third is the mechanical braking protection of the first mechanical braking protection mechanism 7 or the second mechanical braking protection mechanism 8 in the event of braking protection failure of the second photoelectric switch sensor.

[0269] Example 2

[0270] As shown in Figures 17-24, similar to Example 1, this Example 2 provides a fitness chair, including:

[0271] The frame 1 includes a horizontally fixed seat 101;

[0272] A power source fixed on the frame 1 for outputting power,

[0273] A movable mechanism that completes the retraction and extension swing and the stretching swing under the drive of the power source, a walking mechanism that moves the frame 1 under the drive of the power source, and a safety mechanism that provides triple protection for the user during the stretching and swinging;

[0274] The walking mechanism includes a walking traction mechanism 3 for driving the frame 1 to move, and a clutch mechanism 4 for separating and engaging the walking traction mechanism 3 and the frame 1;

[0275] The safety mechanism includes a photoelectric control mechanism and a mechanical brake protection mechanism; the photoelectric control mechanism includes a first photoelectric control mechanism or a second photoelectric control mechanism, and the corresponding mechanical brake protection mechanism is a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8.

[0276] The frame 1 comprises a seat 101, a base frame 102, side frames 103 disposed on either side of the base frame 102, and a seat support frame 104 located between the two side frames 103. The base frame 102, side frames 103, and seat support frame 104 form a frame structure, with the side frames 103 disposed vertically. The seat 101 is fixed to the seat support frame 104 and located between the two side frames 103. A motor fixing plate 105 is disposed inside the side frames 103 to securely support the power source. Protective plates 106 can be provided on the upper, front, rear, and outer sides of the side frames 103, enclosing the power source within the enclosed structure formed by the protective plates 106. A backboard support plate 107 is provided at the rear of the frame 1 to support the backboard when it swings downward to a horizontal position.

[0277] As can be seen from the accompanying drawings, the frame 1 of Example 2 differs slightly from that of Example 1. For example, in Example 1, the protective plate 106 at the rear of the side frame 103, the protective plate 106 at the front of the side frame 103, and the protective plate 106 at the top of the side frame 103 are at the same height, with no height difference. In Example 2, the protective plate 106 at the rear of the side frame 103 is lower than the protective plate 106 at the front of the side frame 103 and the protective plate 106 at the top of the side frame 103, creating a height difference. Compared to the two, the uniform height of the protective plates in Example 1 makes the fitness chair aesthetically pleasing and simplifies installation and manufacturing. In Example 2, the fitness chair does not require users to raise their arms very high when stretching, making it more comfortable.

[0278] Of course, there are other differences between the frame 1 of Example 2 and Example 1, such as slightly different positions and numbers of component parts, but the functions are the same. They are both basic components of the fitness chair of the present invention, used to install a fixed power source, movable mechanism, walking mechanism, and safety mechanism.

[0279] The power source is the same as that of Example 1, which is a power motor 5 with a built-in reducer. The power motor 5 has a drive shaft 501. There are two power motors 5, which are respectively located in the enclosing structure of the two side frames 103 and fixedly connected to the motor fixing plate 105. The drive shaft 501 extends from the opening of the motor fixing plate 105 toward the center position of the seat plate 101.

[0280] Functionally speaking, the drive shaft 501 is suitable for the fitness chair of this application whether it is a single output shaft or a dual output shaft, but based on installation considerations, the power motor 5 selected in this application is a dual output shaft, that is, the output shaft of the power motor 5 has two output ends, so that the safety mechanism and the movable mechanism can be installed on the output shaft at different output ends respectively, avoiding the safety mechanism and the movable mechanism being densely installed on one end of the output shaft.

[0281] The drive shaft 501 is a dual output shaft. There are two power motors 5, which are located in the frame structure of the two side frames 103 and fixedly connected to the motor fixing plate 105. One output end of the drive shaft 501 extends from the opening of the motor fixing plate 105 and faces the center of the seat plate 101 for installing the movable mechanism. The other output end extends away from it but is located in the enclosing structure of the side frame 103 for installing the safety mechanism.

[0282] Similar to the first embodiment, the movable mechanism of the second embodiment includes a back plate portion, a leg plate portion, a connecting rod mechanism 6, and a leg plate connecting member 205;

[0283] In this embodiment, the back panel portion comprises a back panel 201 and guide plates 2011 disposed on either side of the lower rear portion of the back panel 201. The back panel 201 is pivotally connected to the rear portion of the frame 1. The guide plates 2011 are arc-shaped plates. The arc-shaped plates are steel plates, one side of which is bolted to the back panel 201 and the other side of which is an arc-shaped track.

[0284] In this embodiment, the connecting rod mechanism 6 includes an active connecting rod 601 fixedly connected to the driving shaft 501 for transmitting the rotation of the driving shaft 501 outward, and a driven connecting rod 602 pivotally connected to the active connecting rod 601 through a pivot pin 6015.

[0285] An axle pin 6013 is provided at the rear of the active connecting rod 601 , and a bearing 6014 is mounted on the axle pin 6013 . The bearing 6014 is in sliding contact with the arc track of the guide plate 2011 when the fitness chair is folded or extended and swung.

[0286] The guide plate 2011 is designed as an arc plate. When it is retracted and extended and swung, the active connecting rod 601 slides in contact with the arc track of the guide plate 2011 through the axle pin 6013, so that the bearing 6014 on the axle pin 6013 swings along the arc track when the fitness chair is retracted and extended and swung, thereby ensuring the synchronous swing of the leg plate and the back plate. During the stretching swing, the axle pin 6013 disengages from the guide plate 2011.

[0287] The leg plate portion includes a leg plate 203 and leg plate mounting members 206 fixed to both sides of the leg plate 203. The leg plate mounting members 206 are pivotally connected to one end of the driven connecting rod 602 via the leg plate mounting members 206. Power is transmitted between the leg plate mounting members 206, the connecting rod mechanism 6, and the leg plate 203. The power of the drive shaft 501 is transmitted to the leg plate 203 via the connecting rod mechanism 6 and the leg plate mounting members 206.

[0288] The leg board 203 is located on the front side of the seat board 101. Leg board connecting shafts 207 (pivot shafts) are provided on the left and right sides of one end of the leg board 203 close to the seat board 101 and are pivotally connected to one end of the leg board connecting member 205 through the leg board connecting shaft 207. The other end of the leg board connecting member 205 is rotatably connected to the drive shaft 501. The leg board 203 and the leg board mounting member 206 constitute the leg board part. In fact, the leg board part can also be an integrated component composed of the leg board 203 and the leg board mounting member 206. The split component composed of the leg board 203 and the leg board mounting member 206 here is made for the convenience of installation and maintenance.

[0289] A limit assembly is provided between the leg plate mounting member 206 and the leg plate connecting member 205. The limit assembly includes a limit spring 208, a first limit pin, and a second limit pin. The first limit pin is provided on the outer side of one end of the leg plate connecting member 205 close to the leg plate connecting shaft 207, and the second limit pin is provided at the top of the leg plate mounting member 206. The limit spring 208 is connected between the first limit pin and the second limit pin.

[0290] The other end of the active connecting rod 601 is provided with an axle pin 6013, which fits with the arc track of the guide plate 2011 provided at the rear of the back plate mounting member 204 through the bearing 6014 on the gear pin axle pin 6013; when the back plate 201 is in a vertical state, the bearing 6014 is located on the arc track of the guide plate 2011; when the back plate 201 is turned to a horizontal state, the active connecting rod 601 drives the axle pin 6013 to rotate downward, and the back plate 201 rotates downward and gradually turns to a horizontal state; when the back plate 201 is in a horizontal state, the back plate 201 is placed on the frame 1, and the axle pin 6013 swings along with the active connecting rod 601 and disengages from the arc track;

[0291] A second limit block 604 is provided on the inner side of the middle part of the driven connecting rod 602; when the leg board 203 is in a horizontal state, the second limit block 604 of the driven connecting rod 602 conflicts with the lower bottom surface of the leg board connecting piece 205, and the fitness chair enters the stretching and swinging state. The driven connecting rod 602 no longer applies force to the leg board 203 alone, and the active connecting rod 601 pushes the driven connecting rod 602, the leg board mounting piece 206, the leg board 203, and the leg board connecting piece 205 to cooperate to perform stretching and swinging. At this time, the active connecting rod 601 and the driven connecting rod 602 do not move relative to each other.

[0292] For the safety considerations of the retracted and extended swing and the stretching swing and to prevent the user's clothes from being squeezed in, a protective cover 603 with an open lower end is provided on the periphery of the driven link 602. The protective cover 603 forms a semi-enclosed structure with an open lower end, covering the driven link 602 and the leg plate connector 205 in the semi-enclosed structure of the protective cover.

[0293] As can be seen from the figures, the back plate of this embodiment differs from that of Example 1 in its composition, and the pivotal connection position and movement of the active link 601 and the back plate are also modified. The shapes of the active link 601 and the passive link 602 are different, and the pivotal connection position between the active link 601 and the passive link 602 is also changed, but the power transmission between the active link 601 and the passive link 602 remains unchanged.

[0294] After the guide plate 2011 is provided on the back panel 201, the back panel portion and the leg panel portion of this embodiment swing synchronously in opposite directions during the retraction and extension swinging, and the swing consistency and uniformity of the back panel portion and the leg panel portion are better.

[0295] The walking traction mechanism 3 and its clutch mechanism 4 in this embodiment have basically the same structural composition as those in Example 1, and are both arranged between the front and rear ends of the frame. The slight difference is that one end of the first pulling rope is fixedly connected to the guide plate 2011, which is adapted to the structural change of the back plate part of this embodiment, but can also be arranged at the rear position of the back plate as in Example 1. The above structure will not be described in detail here.

[0296] The safety mechanism of this embodiment includes a photoelectric control mechanism and a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8. The first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 can both be used in Example 2 to provide safety protection for the fitness chair. The first mechanical brake protection mechanism 8 is introduced here to match it. The photoelectric control mechanism of this embodiment is the second photoelectric control mechanism.

[0297] In this embodiment, the second mechanical brake protection mechanism 8 includes:

[0298] The electric cylinder 801 is used to output the power for safety braking at the high and low points of the lacing muscle swing;

[0299] A positioning wheel is rotatably disposed on the outer end of the drive shaft 501, and a C-shaped regulating groove 807 is provided on the inner side of the positioning wheel;

[0300] Support plate 803, fixedly mounted on frame 1;

[0301] Two brake levers 804 are provided on either side of the periphery of the positioning wheel and are pivotally connected to one side of the support plate 803 via a support shaft. The lower ends of the two brake levers 804 are hinged to the head and tail of the electric cylinder 801. When the electric cylinder 801 is extended or retracted, the brake levers 804 swing open and close around the support shaft, causing the front ends of the brake levers 804 to engage or disengage with the positioning wheel. When engaged, the brake is applied, and when disengaged, the brake is released.

[0302] The positioning arm 806 is mounted on the driving shaft 501. The positioning arm 806 is provided with a positioning shaft 811, which is embedded in the C-shaped regulating groove 807 and moves with the positioning arm 806;

[0303] The driving shaft 501 drives the positioning shaft 811 to rotate through the positioning arm 806, and drives the positioning wheel to rotate in coordination when touching the end of the C-shaped regulating groove 807. When the user stretches the muscles to the maximum angle, the electric cylinder 801 applies force, and the brake rod 804 engages with the positioning wheel to brake the positioning wheel, completing the mechanical brake setting of the second mechanical brake protection mechanism.

[0304] To simplify the structure, provide better braking force, and enhance braking effectiveness, the positioning wheel in this embodiment serves as a positioning gear 802, and the corresponding brake lever 804 serves as a brake arm. The front end of the brake arm is embedded with a rack 805 that engages with the positioning gear 802 during braking. The combination of rack 805 and positioning gear 802 allows for a smaller structure while providing greater braking force, simplifying the second mechanical brake protection mechanism 8 in this embodiment and making it compatible with the structure of the fitness chair.

[0305] A sheave is provided on the outside of the positioning gear 802 and is connected to a reset wire rope 808 through the sheave. The reset wire rope 808 is wound through the steering wheel assembly and connected to a cylindrical threaded tension spring 809. The other end of the cylindrical threaded tension spring 809 is fixedly connected to the frame. The steering wheel assembly includes a steering shaft and a steering wheel 810 rotatably mounted on the steering shaft. The steering shaft is fixedly connected to the frame.

[0306] The second photoelectric control mechanism of this embodiment includes:

[0307] A fifth photoelectric switch sensor 907 is provided at the top of the front side of the frame; a third shielding piece 908 is provided at the rear of the leg plate; during the retraction and extension swing, the leg plate swings from horizontal to vertical, and when the third shielding piece 908 shields the fifth photoelectric switch sensor 907, a braking signal is generated to stop the retraction and extension swing;

[0308] The sixth photoelectric switch sensor 909 is provided at the top of the middle portion of the frame. When the protective cover 603 or the driven link 602 blocks the sixth photoelectric switch sensor 909 during the stretching, a reverse signal is generated, causing the driven link, the leg plate portion, and the leg plate connector to swing upward in the opposite direction in coordination.

[0309] The seventh photoelectric switch sensor 910 is provided on a positioning wheel; when the stretching bar swings to the high position, the positioning arm 806 first blocks the seventh photoelectric switch sensor 910, sending a reverse signal, causing the driven link, the leg plate portion, and the leg plate connecting member to swing downward in the opposite direction in coordination;

[0310] The eighth photoelectric switch sensor is arranged on the other side positioning wheel and is spatially offset from the seventh photoelectric switch sensor; when the stretching rod swings to the high position, if the seventh photoelectric switch sensor 910 fails and does not send a reversal signal, the corresponding positioning arm 806 blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the driven connecting rod, leg plate part, and leg plate connecting part to swing downward in the opposite direction in coordination.

[0311] The fitness chair of this embodiment, through the combination of an electric cylinder, a positioning gear, a C-shaped regulating groove, two brake rods, two racks, two photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor), a positioning arm, and a positioning shaft, can set the reversing position of the stretching swing high point and the safe braking position of the maximum stretching angle, thereby achieving triple protection to ensure the safe use of the fitness chair.

[0312] The seventh and eighth photoelectric switches are both located before the mechanical brake position of the second mechanical brake protection mechanism 8. The seventh photoelectric switch, located at the first obstructed position during the rotation of the positioning gear, acts as a reversing switch for the high point of the tie rod's swing. The tie rod's swing direction reverses when it reaches its high point at this position. The eighth photoelectric switch, located between the seventh photoelectric switch and the mechanical brake position, acts as a reversing switch for the high point of the tie rod's swing. It issues a reversing signal when the seventh photoelectric switch fails and the drive shaft swings upward again.

[0313] The second mechanical brake protection mechanism 8 is the final safety guarantee of the fitness chair of this embodiment, and is a safety brake guarantee in the event that both photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor) may fail.

[0314] The specific setup is that when the two brake levers are opened, the racks on the brake levers disengage from the positioning gear. As the drive shaft swings, the positioning shaft on the positioning arm swings in the C-shaped adjustment slot, and when it touches the end point of the C-shaped adjustment slot, it drives the positioning gear to swing. At the maximum tensioning angle that the user can tolerate, the two brake levers close toward each other, and the racks on the brake levers engage with the positioning gear, braking the drive shaft and thus setting the mechanical brake position. After the angle is set, the two brake levers are released, the braking force disappears, and the reset wire rope pulls the positioning gear to reset, thereby resetting the drive shaft.

[0315] The above-mentioned safety mechanism of this embodiment realizes triple protection when in high position, the first is the reverse swing control protection of the seventh photoelectric switch sensor 910, the second is the reverse swing control protection of the eighth photoelectric switch sensor in the event of control failure of the seventh photoelectric switch sensor 910, and the third is the mechanical braking protection of the second mechanical brake protection mechanism 8 in the event of reverse swing control failure of the seventh photoelectric switch sensor 91 and the eighth photoelectric switch sensor.

[0316] In the specific setting, the reverse swing control protection of the seventh photoelectric switch sensor 910 has a failure reminder. At this time, the reverse swing control protection is completed by the eighth photoelectric switch sensor. At the same time, the reminder setting can remind the user to replace the seventh photoelectric switch sensor 910 in time, but this setting is not the protection focus of this application and will not be described in detail here.

[0317] The second mechanical brake protection mechanism 8 is a brake protection when the reverse swing control protections of the seventh photoelectric switch sensor 910 and the eighth photoelectric switch sensor fail at the same time. It has a high safety level and is also the most reliable protection.

[0318] Compared to the first mechanical brake protection mechanism 7 of Example 1, the second mechanical brake protection mechanism 8 of this embodiment has a simpler structure and is easier to operate, but its function remains the same: achieving upper reversal and safety braking during the stretching and swinging of the fitness chair. Because the angle formed by the two endpoints of the C-shaped control groove and the center of the positioning plate satisfies the condition of 90 degrees < angle ≤ 180 degrees, the positioning shaft will not contact the endpoints of the C-shaped control groove during the stretching and swinging process, and will reciprocate within the range defined by the C-shaped control groove.

[0319] It should be noted that the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 of Example 1 can be interchangeable, and the corresponding first photoelectric control mechanism and the second photoelectric control mechanism are replaced accordingly, and their installation positions change with the changes of the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8.

[0320] As shown in FIG25 , the working method of the fitness chairs of the above-mentioned embodiments 1 and 2 is as follows:

[0321] S1: The fitness chair is at rest, in the seating position, the clutch mechanism is engaged, the traction spring in the walking traction mechanism is stretched, and the traction spring is storing energy;

[0322] S2. The person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller;

[0323] S3. Click the power start button to energize the power motor, and the drive shaft drives the active connecting rod to swing, which pushes the leg plate to swing upward from vertical position through the driven connecting rod; at the same time, as the active connecting rod swings, the back plate loses its support, the traction spring stores energy and releases it, the second traction rope pulls the double-groove rope pulley to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turning off the power motor and stopping the swinging;

[0324] S4. Setting the maximum swing angle: After the user lies flat, the handle switch is toggled downward, and the power motor drives the active connecting rod to continue rotating, pushing the driven connecting rod, the leg plate connector, and the leg plate to swing upward in a coordinated manner; when the swing reaches the maximum angle that the user can withstand, the handle switch is immediately released, the power motor stops moving, and the confirmation button on the handle switch is clicked. The positioning disk or positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle;

[0325] S5. After locking the positioning disc or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake lever from the positioning gear.

[0326] S6. The positioning disc or positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connector, and the leg plate portion swing downward in a coordinated manner to a horizontal position, the power motor continues to rotate, and the leg plate portion and the back plate portion are transformed into a seat position. At the same time, the fitness chair moves backward to its initial position, and the positioning disc rotates back to its initial position along with the control pin or the positioning wheel along with the positioning shaft; the tension spring returns to its stretched state to store energy; and this stretching of the fitness chair is completed;

[0327] S7. If the fitness chair needs to be pushed, disconnect the clutch mechanism to disengage the clutch mechanism from the walking traction mechanism.

[0328] By analogy with Examples 1 and 2, after removing the connecting rod mechanism 6, the leg board connector 205, the seat board 101 and simplifying the photoelectric control mechanism, the present application can provide two swing angle limiting braking protection mechanisms, which can be used alone in a rotating device that needs to limit the rotation angle, thus producing the swing angle limiting braking protection mechanism of Example 3 and the swing angle limiting braking protection mechanism of Example 4.

[0329] Example 3:

[0330] As can be seen from Figures 1-4 and 7-11, the swing angle limiting braking protection mechanism of this embodiment includes a power motor 5, a positioning assembly 703, a positioning plate 701, and an electric push rod 702, wherein the power motor 5 is arranged on the frame 1 to output swing power (the specific structure of the frame 1 can change accordingly with the change of the use scenario of the swing angle limiting braking protection mechanism); the positioning assembly 703 is fixedly arranged on the drive shaft 501 of the power motor 5, the positioning plate 701 is rotatably sleeved on the drive shaft 501, and the electric push rod 702 is pivotally connected to the frame 1; there are two power motors 5, and correspondingly there are two sets of positioning assemblies, positioning plates 701, and electric push rods 702;

[0331] The positioning disc 701 is provided with a brake groove, in which a drum brake component is provided, so that the drum brake component brakes the positioning disc; the drum brake component is hinged to the electric push rod 702, and the brake on the positioning disc 701 is released when the electric push rod 702 is shortened; the positioning disc 701 is provided with a C-shaped adjustment groove 7011 on one side of the positioning assembly, and the positioning assembly has an adjustment pin 7031, which is embedded in the C-shaped adjustment groove 7011 and rotates;

[0332] The electric push rod 702 shortens to release the brake of the drum brake component on the positioning plate 701. The drive shaft 501 drives the control pin 7031 to rotate through the positioning assembly, and when it touches the end of the C-shaped control slot 7031, it drives the positioning plate 701 to rotate in coordination; when the electric push rod 702 extends, the drum brake component expands, mechanically braking the positioning plate 701 and setting the maximum swing angle of the drive shaft 501.

[0333] The drum brake component includes a brake sleeve 710, a brake plate 705, an upper brake pad 708 and a lower brake pad 709; the brake sleeve 710 has an elliptical outer periphery and is rotatably arranged on the drive shaft 501, the brake plate 705 is fixedly arranged on the brake sleeve 710, and the upper brake pad 708 and the lower brake pad 709 are arranged on the periphery of the brake sleeve 710 and are hinged to each other at one end through a limit pin 707;

[0334] The upper brake pad 708 and the lower brake pad 709 are provided with a brake spring assembly 712 on the opposite side of the hinged end to provide braking force for the upper brake pad 708 and the lower brake pad 709. The brake plate 705 is hinged to the electric push rod 702; the limit pin shaft 707 is hinged to the drum brake support plate 706, and the drum brake support plate 706 is fixedly connected to the frame 1.

[0335] The brake spring assembly 712 includes an adjustment pin 7122, an adjustment spring 7123, and an adjustment nut 7124. The adjustment pin 7122 is fixed to the upper brake pad 708. The lower brake pad 709 is provided with a groove for the adjustment pin 7122 to be inserted. The adjustment spring 7124 is provided around the adjustment pin 7122. The adjustment nut 7124 is mounted above the adjustment pin 7122 to compress the adjustment spring. The braking force exerted by the adjustment spring 7123 on the upper and lower brake pads 708 and 709 is adjusted by adjusting the vertical position of the adjustment nut 7124.

[0336] The positioning assembly 703 includes a positioning plate, and the regulating pin 7031 is arranged on the positioning plate; on the opposite side of the regulating pin 7031, the positioning plate is provided with a positioning pointer 7032 to constitute an extended end of the positioning plate.

[0337] The positioning plate 701 is provided with a torsion spring 711 inside the brake groove. One end of the torsion spring 711 is fixedly connected to the upper brake pad 708 or the lower brake pad 709, and the other end is hooked to the reset pin 714 on the positioning plate 701 to provide a restoring force for the positioning plate 701.

[0338] A first photoelectric switch sensor 901 is fixedly provided on the periphery of a positioning plate 701. When the drive shaft 501 swings upward to a high position, the positioning assembly first blocks the first photoelectric switch sensor 901 and sends a reversal signal, causing the drive shaft 501 to swing downward in the opposite direction.

[0339] A second photoelectric switch sensor 902 is fixedly provided on the periphery of the other positioning plate 701. When the drive shaft 501 swings upward, if the positioning component blocks the first photoelectric switch sensor 901 without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor 902 and sends a reversal signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction.

[0340] Example 4:

[0341] As can be seen from Figures 18, 20-23, the swing angle limiting brake protection mechanism of this embodiment includes a power motor 5, an electric cylinder 801, a positioning wheel, a support plate 803, a positioning arm 806, and two brake rods 804; wherein the power motor 5 is arranged on the frame 1, and has a drive shaft 501 to output swing power; the electric cylinder 801 is used to output a safety braking force at the high point of the swing; the positioning wheel is rotatably arranged at the outer end of the drive shaft 501, and the positioning wheel is provided with a C-shaped regulating groove 807 on the inner side; the support plate 803 is fixedly arranged on the frame 1 On top; two brake rods 804 are arranged on both sides of the periphery of the positioning wheel and are pivotally connected to one side of the support plate 803 through a support shaft; the lower ends of the two brake rods 804 are hinged to the head and tail of the electric cylinder 801, and when the electric cylinder 801 is telescopic, it swings open and closed with the support shaft as the center, so that the front end of the brake rod 804 engages or disengages with the positioning wheel, braking when engaging and releasing the brake when disengaging; the positioning arm 806 is fixedly mounted on the drive shaft 501, and the positioning arm 806 is provided with a positioning shaft 811, which is embedded in the C-shaped regulating groove 807 and moves with the positioning arm 806; the angle formed by the two groove end points of the C-shaped regulating groove 807 and the center of the positioning wheel satisfies 90 degrees < angle ≤ 180 degrees.

[0342] The drive shaft 501 drives the positioning shaft 811 to rotate through the positioning arm, and when it touches the end of the C-shaped regulating groove 807, it drives the positioning wheel to rotate in coordination; the electric cylinder 801 applies force, the brake rod 804 engages with the positioning wheel, brakes the positioning wheel, and sets the maximum swing angle of the drive shaft.

[0343] A sheave is provided on the outside of the positioning gear 802 and is connected to a reset wire rope 808 through the sheave. The reset wire rope 808 is wound through the steering wheel assembly and connected to a cylindrical threaded tension spring 809. The other end of the cylindrical threaded tension spring 809 is fixedly connected to the frame. The steering wheel assembly includes a steering shaft and a steering wheel 810 rotatably mounted on the steering shaft. The steering shaft is fixedly connected to the frame 1.

[0344] There are two power motors 5, and two sets of corresponding electric cylinders 801, positioning wheels, and positioning arms 806; a seventh photoelectric switch sensor 910 is provided on one positioning wheel. When the drive shaft 501 swings upward to a high position, the positioning arm 806 first blocks the seventh photoelectric switch sensor 910 and sends a reversal signal, causing the drive shaft 501 to swing downward in the opposite direction; an eighth photoelectric switch sensor is provided on the other positioning wheel, which is spatially offset from the seventh photoelectric switch sensor 910; when the drive shaft 501 swings upward to a high position, if the seventh photoelectric switch sensor 910 fails and does not send a reversal signal, the corresponding positioning arm 806 blocks the eighth photoelectric switch sensor, sending a reversal signal before the mechanical brake, causing the drive shaft 501 to swing downward in the opposite direction;

[0345] The positioning wheel in this embodiment is the positioning gear 802, and the corresponding brake rod 804 is a brake arm. The front end of the brake arm is inlaid with a rack 805, which engages with the positioning gear 802 during braking.

Claims

1. A fitness chair, characterized in that: include A frame, the frame comprising a seat for a user to sit or lie on; as well as A power source, fixed on the frame, having a drive shaft for outputting power; and An active mechanism that completes the retracting and extending swing and the stretching and swinging under the drive of a power source; The movable mechanism comprises a leg plate portion, a connecting rod mechanism, and a leg plate connecting member pivotally connected to the driving shaft; The leg plate portion is pivotally connected to the leg plate connecting member through a pivot shaft and is located in front of the seat plate; The connecting rod mechanism includes an active connecting rod fixedly connected to the driving shaft and used to transmit the rotation of the driving shaft outward, and a driven connecting rod pivotally connected to the active connecting rod through a pivot pin, and the driven connecting rod swings under the drive of the active connecting rod; The driven connecting rod is pivotally connected to the leg plate portion, and drives the leg plate portion to retract and swing around the pivot axis, so that the leg plate portion moves from vertical to horizontal or / and from horizontal to vertical; The active connecting rod drives the driven connecting rod, the leg plate connecting piece and the leg plate part to swing in coordination with the tensioning rod around the driving shaft, so that the driven connecting rod, the leg plate connecting piece and the leg plate part move from the horizontal position to the high position and then from the high position to the horizontal position.

2. The fitness chair as claimed in claim 1, characterized in that: The power source is a power motor, the drive shaft is an output shaft of the power motor, and the output shaft is higher than the seat plate.

3. The fitness chair as claimed in claim 2, characterized in that: The frame body includes side frames located on the left and right sides of the seat plate, and the side frames are frame structures; there are two power motors, and the two power motors are respectively fixed on the two side frames; the drive shaft extends horizontally from the side frames to the inside, and the active connecting rod and the leg plate connecting parts are installed on the drive shaft and located on the inside of the side frames.

4. The fitness chair according to claim 1, characterized in that: The leg plate portion comprises a leg plate and leg plate mounting members fixed on both sides of the leg plate, and the leg plate is pivotally connected to the driven connecting rod through the leg plate mounting members.

5. The fitness chair according to claim 1, characterized in that: The movable mechanism includes a first back plate portion; the first back plate portion is composed of a back plate and guide plates on both sides of the lower rear portion of the back plate, the back plate portion is pivotally connected to the rear portion of the frame through the guide plate, the guide plate is an arc plate, and the arc plate has an arc track; the rear portion of the active connecting rod is provided with an axle pin with a bearing, when the active connecting rod is retracted and swung, the active connecting rod is in sliding contact with the arc track of the guide plate through the axle pin, and when the tensioning rod swings, the axle pin is disengaged from the guide plate.

6. The fitness chair as claimed in claim 5, characterized in that: A second limit block is provided on the inner side of the middle part of the driven connecting rod, and when the second limit block contacts the lower bottom surface of the leg plate connecting piece, the relative movement between the driven connecting rod and the leg plate connecting piece is limited; during the retraction and extension swing, the second limit block does not contact the leg plate connecting piece, and the active connecting rod applies force to the leg plate part through the driven connecting rod, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; during the tensioning swing, the second limit block contacts the leg plate connecting piece, and the active connecting rod applies force to the driven connecting rod, the leg plate part, and the leg plate connecting piece, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal.

7. The fitness chair as claimed in claim 5, characterized in that: A protective cover with an opening at the lower end is arranged on the outer periphery of the driven connecting rod to cover the driven connecting rod and the leg plate connecting piece.

8. The fitness chair as claimed in claim 1, characterized in that: The movable mechanism includes a second back panel portion; the second back panel portion includes a back panel and back panel mounting parts located on both sides below the back panel, and the second back panel portion is pivotally connected to the drive shaft through the back panel mounting parts; a shift pin is provided at the rear of the active connecting rod, and when the fitness chair is retracted, extended or swung, the active connecting rod is in sliding contact with the bottom surface of the back panel mounting part through the shift pin.

9. The fitness chair as claimed in claim 8, characterized in that: A shift groove is arranged at the lower part of the back plate mounting piece; and the shift pin is in high-pair contact with the top surface of the shift groove.

10. The fitness chair as claimed in claim 8, characterized in that: A first limit block is provided at the far end of the active connecting rod. When the first limit block contacts the lower bottom surface of the driven connecting rod, the relative movement between the active connecting rod and the driven connecting rod is limited; during the retraction and extension swing, the first limit block does not touch the driven connecting rod, and the active connecting rod applies force to the leg plate part through the driven connecting rod, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; during the tensioning swing, the first limit block touches the driven connecting rod, and the active connecting rod applies force to the driven connecting rod, the leg plate part, and the leg plate connecting piece, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal.

11. The fitness chair according to claim 5, characterized in that: A limit assembly is provided between the leg board mounting member and the leg board connecting member; the limit assembly comprises: A limit stopper is arranged at the lower inner side of the front part of the leg plate connecting member to limit the upward swing of the leg plate when the leg plate is swung to the horizontal position; The leg plate connecting member is provided with a first limit pin on the outer side of one end close to the leg plate connecting shaft, and a second limit pin is provided on the top of the leg plate mounting member, and a limit tension spring is connected between the first limit pin and the second limit pin; The limit tension spring is connected between the leg plate connecting piece and the leg plate portion, and applies force to the leg plate portion and the leg plate connecting piece when limiting.

12. The fitness chair according to claim 5 or 8, characterized in that: The frame body is horizontally provided with a backboard support plate at the rear to support the backboard part when the backboard part swings downward to a horizontal position.

13. The fitness chair according to claim 1, characterized in that: The fitness chair also includes a walking mechanism; the walking mechanism includes a walking traction mechanism for driving the frame to move; The walking traction mechanism comprises: The driving shaft and the driven shaft are rotatably arranged under the frame, and A driving wheel and a driven wheel are respectively arranged on the driving shaft and the driven shaft; as well as Double-groove rope wheel, first pulling rope, second pulling rope, pulling spring; The double-groove rope pulley is arranged on the driving shaft and is connected to the driving shaft through a clutch mechanism. One end of the first traction rope is wound in one of the grooves of the double-groove rope pulley, and the other end of the first traction rope passes through the guide wheel assembly arranged at the front end of the frame and is connected to the back plate; one end of the second traction rope is wound in the other groove of the double-groove rope pulley and passes through the guide wheel assembly in an opposite winding direction to the first traction rope, and the other end of the second traction rope is fixedly connected to the guide wheel assembly; one end of the traction spring is connected to the guide wheel assembly, and the other end is connected to the rear end of the frame.

14. The fitness chair as claimed in claim 13, characterized in that: The guide wheel assembly includes a front bracket fixed to the front end of the frame, a spring connecting plate hung with a pulling spring, and a spring seat plate pivotally connected to the spring connecting plate; the spring connecting plate is pivotally connected to a first guide wheel and a second guide wheel in parallel, and the front bracket is pivotally connected to a third guide wheel and a fourth guide wheel in parallel, and the fourth guide wheel is double wheels; the first pulling rope is wound around one of the fourth guide wheels and then wound in the rope groove of the double-groove rope wheel, one end of the second pulling rope is connected to the front bracket, and then wound around the second guide wheel, the third guide wheel, the first guide wheel, and the other of the fourth guide wheels and then wound in the other rope groove of the double-groove rope wheel and in the opposite direction of the pulling direction of the first pulling rope; one end of the pulling spring is hung on the spring connecting plate, and the other end is hung on the rear bracket and is fixedly connected to the rear end of the frame through the rear bracket.

15. The fitness chair according to claim 13, characterized in that: The clutch mechanism includes a first coupling member, a second coupling member, a reset spring, and a limit sleeve; the first coupling member is rotatably sleeved on the outside of the driving shaft; a second coupling member is provided on the side of the first coupling member away from the double-groove rope pulley, and the second coupling member is sleeved on the outside of the driving shaft. The second coupling member is key-connected to the driving shaft so that the second coupling member slides along the length direction of the driving shaft. A limit sleeve is provided on the side of the second coupling member away from the first coupling member, and the reset spring sleeve is located between the second coupling member and the limit sleeve. The second coupling member is engaged with the first coupling member under the extrusion of the reset spring; the second coupling member is connected to the frame through a switch assembly.

16. The fitness chair according to claim 15, characterized in that: The switch assembly includes a clutch mounting frame, an eccentric wheel, a hand crank, a movable connecting rod, and a clutch sleeve; the clutch mounting frame is fixedly connected to the frame body, the eccentric wheel is rotatably connected to the clutch mounting frame and the center position of the eccentric wheel is fixedly connected to the hand crank, the middle part of the movable connecting rod is pivotally connected to the pin shaft of the clutch mounting frame, one end of the movable connecting rod abuts against the bottom end of the eccentric wheel, and the bottom of the other end of the movable connecting rod is connected to the clutch sleeve, and the clutch sleeve is arranged on the outside of the second coupling member and pushes the second coupling member to slide in the direction of the limit sleeve.

17. The fitness chair according to claim 1, characterized in that: The fitness chair comprises a first mechanical brake protection mechanism, wherein the first mechanical brake protection mechanism comprises two sets, which are respectively arranged on the outsides of the two driving shafts; The first mechanical brake protection mechanism comprises a positioning assembly fixedly arranged at the outer end of the driving shaft, a positioning plate rotatably sleeved on the outer end of the driving shaft, and an electric push rod pivotally connected to the frame; the positioning plate is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning plate; the drum brake component is hinged to the electric push rod, and the brake on the positioning plate is released when the electric push rod is shortened; The positioning plate is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement; The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the regulating pin to rotate through the positioning assembly, and drives the positioning plate to rotate cooperatively when it touches the end of the C-shaped regulating groove. When the user stretches the muscle to the maximum angle, the electric push rod extends, the drum brake component expands, and the positioning plate is braked, completing the mechanical brake setting of the first mechanical brake protection mechanism.

18. The fitness chair according to claim 17, characterized in that: The drum brake component includes an elliptical brake sleeve rotatably arranged on the drive shaft, a brake plate fixedly arranged on the brake sleeve, an upper brake pad and a lower brake pad arranged on the periphery of the brake sleeve and hinged to each other at one end by a limit pin, and the upper brake pad and the lower brake pad are provided with brake spring assemblies on the opposite sides of the hinged ends to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

19. The fitness chair according to claim 18, characterized in that: The brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut. The adjusting pin is fixed on the upper brake pad. The lower brake pad is provided with a groove for the adjusting pin to be embedded. The periphery of the adjusting pin is provided with an adjusting spring. An adjusting nut is installed on the upper part of the adjusting pin to compress the adjusting spring.

20. The fitness chair according to claim 17, characterized in that: The positioning assembly comprises a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer constituting an extended end of the positioning plate.

21. The fitness chair according to claim 18, characterized in that: The positioning disc is provided with a torsion spring inside the brake groove, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning disc to provide a restoring force for the positioning disc.

22. The fitness chair according to claim 17, characterized in that: The fitness chair comprises a first photoelectric control mechanism, and the first photoelectric control mechanism comprises: The first photoelectric switch sensor is fixedly arranged on the periphery of the positioning plate on one side; when the tensioning rod swings to the high position, the positioning component first blocks the first photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The second photoelectric switch sensor is fixedly arranged on the periphery of another positioning plate; when the tensioning rod swings to the high position, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The third photoelectric switch sensor is arranged on the frame; the first shielding piece is arranged on the leg plate connecting piece; when the tensioning bar swings to the horizontal position, the leg plate connecting piece swings down to shield the third photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction; The fourth photoelectric switch sensor is arranged on the frame; the second shielding piece is arranged on one side of the leg plate; during the retracting and extending swing, the leg plate swings from horizontal to vertical, and the second shielding piece shields the fourth photoelectric switch sensor, and sends a braking signal to stop the retracting and extending swing.

23. The fitness chair according to claim 1, characterized in that: The fitness chair comprises a second mechanical braking protection mechanism, and the second mechanical braking protection mechanism comprises: Electric cylinder, used to output safety braking force at the high point of the swing of the reinforcement; A positioning wheel, rotatably arranged at the outer end of the driving shaft, wherein the positioning wheel is provided with a C-shaped regulating groove on the inner side; A support plate is fixedly arranged on the frame; Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rod is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and braking is released when disengaged; A positioning arm is mounted on the driving shaft, and a positioning shaft is provided on the positioning arm and is embedded in the C-shaped regulating groove and moves with the positioning arm; The driving shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped regulating groove, it drives the positioning wheel to rotate cooperatively. When the user stretches the muscle to the maximum angle, the electric cylinder applies force, the brake rod engages with the positioning wheel, and the positioning wheel is braked to complete the mechanical brake setting of the second mechanical brake protection mechanism.

24. The fitness chair according to claim 23, characterized in that: The positioning wheel disc is a positioning gear, the brake rod is a brake arm, and a rack is inlaid on the front end of the brake arm, which meshes with the positioning gear during braking.

25. The fitness chair according to claim 23, characterized in that: A rope groove wheel is arranged outside the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to a cylindrical threaded tension spring after winding through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

26. The fitness chair according to claim 25, characterized in that: The steering wheel assembly comprises a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

27. The fitness chair according to claim 23, characterized in that: The fitness chair includes a second photoelectric control mechanism, and the second photoelectric control mechanism includes: The fifth photoelectric switch sensor is arranged at the top of the front side of the frame; the third shielding piece is arranged at the rear of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and when the third shielding piece shields the fifth photoelectric switch sensor, a braking signal is sent to stop the retracting and extending swinging; The sixth photoelectric switch sensor is arranged at the top of the middle part of the frame; when the tensioning rod swings to the horizontal position, the driven connecting rod blocks the sixth photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction; The seventh photoelectric switch sensor is arranged on a positioning wheel; when the tensioning arm swings to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The eighth photoelectric switch sensor is arranged on the positioning wheel on the other side and is spatially offset from the seventh photoelectric switch sensor; when the tensioning arm swings to a high position, if the seventh photoelectric switch sensor fails and does not send a reversal signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the driven connecting rod, the leg plate part, and the leg plate connecting piece to swing downward in the opposite direction in coordination.

28. The fitness chair according to claim 17 or 23, characterized in that: The included angle formed by the two end points of the C-shaped regulating groove and the center of the positioning wheel satisfies 90 degrees < included angle ≤ 180 degrees.

29. A working method of a fitness chair, characterized in that: The working method comprises the following steps: S1, the fitness chair is stationary, in the seat state, the clutch mechanism is in the engaged state, the traction spring in the walking traction mechanism is in the stretched state, and the traction spring stores energy; S2, the person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller; S3, click the power start button, the power motor is powered, the drive shaft drives the active connecting rod to swing, and the driven connecting rod pushes the leg plate to swing upward from vertical; at the same time, with the swing of the active connecting rod, the back plate loses support, the energy stored in the pulling spring is released, the second pulling rope pulls the double-groove rope wheel to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turns off the power motor, and stops swinging; S4, maximum swing angle setting: after the person lies flat, the handle switch is pushed down, the power motor drives the active connecting rod to continue to rotate, and the driven connecting rod, the leg board connecting piece, and the leg board part are pushed upward in coordinated action; when the swing reaches the maximum angle that the user can bear, the handle switch is immediately released, the power motor stops moving, the confirmation button on the handle switch is clicked, the positioning plate or the positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle; S5. After locking the positioning plate or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake rod from the positioning gear. S6, the positioning plate or the positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connecting piece, and the leg plate part cooperate to swing down and swing to a horizontal position, the power motor continues to rotate, so that the leg plate part and the back plate part change to a seat state position, and at the same time the fitness chair moves backward to the initial position, the positioning plate rotates with the control pin shaft or the positioning wheel rotates with the positioning shaft to the initial position; the pulling spring returns to the stretched state to store energy; this fitness chair stretching is completed; S7. If the fitness chair needs to be pushed, disconnect the clutch mechanism to disengage the clutch mechanism from the walking traction mechanism.

30. A swing angle limited braking protection mechanism, characterized in that: include: A power motor is arranged on the frame and has a driving shaft to output swing power; The positioning assembly is fixedly arranged at the outer end of the drive shaft. The positioning plate is rotatably mounted on the outer end of the drive shaft. Electric push rod; pivotally connected to the frame; The positioning disc is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning disc; the drum brake component is hinged to the electric push rod, and the brake on the positioning disc is released when the electric push rod is shortened; A C-shaped regulating groove is provided on the positioning plate at one side of the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement; The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the control pin to rotate through the positioning assembly, and when it touches the end of the C-shaped control slot, it drives the positioning plate to rotate in coordination. When the electric push rod extends, the drum brake component expands, mechanically brakes the positioning plate, and sets the maximum swing angle of the drive shaft.

31. The swing angle limiting braking protection mechanism according to claim 30, characterized in that: The drum brake component comprises: The brake sleeve has an elliptical outer circumference and is rotatably arranged on the drive shaft. The brake plate is fixed on the brake sleeve. The upper brake pad and the lower brake pad are arranged on the periphery of the brake sleeve and are hinged to each other at one end through a limit pin; The upper brake pad and the lower brake pad are provided with brake spring assemblies on the opposite sides of the hinged ends to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin shaft is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

32. The swing angle limiting braking protection mechanism according to claim 31, characterized in that: The brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut. The adjusting pin is fixed on the upper brake pad. The lower brake pad is provided with a groove for the adjusting pin to be embedded. An adjusting spring is provided on the periphery of the adjusting pin. An adjusting nut is installed on the upper part of the adjusting pin. The braking force of the brake spring assembly on the upper brake pad and the lower brake pad is adjusted by adjusting the upper and lower positions of the adjusting nut.

33. The swing angle limiting braking protection mechanism according to claim 30, characterized in that: The positioning assembly comprises a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer constituting an extended end of the positioning plate.

34. The swing angle limiting braking protection mechanism according to claim 30, characterized in that: The positioning disc is provided with a torsion spring inside the brake groove, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning disc to provide a restoring force for the positioning disc.

35. The swing angle limiting braking protection mechanism according to claim 30, characterized in that: There are two power motors, and two sets of corresponding positioning components, positioning plates, and electric push rods; A first photoelectric switch sensor is fixedly arranged on the periphery of a positioning plate. When the driving shaft swings upward to a high position, the positioning component first blocks the first photoelectric switch sensor and sends a reverse signal to make the driving shaft swing downward in the opposite direction. A second photoelectric switch sensor is fixedly provided on the periphery of the other positioning plate. When the drive shaft swings upward, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction.

36. A swing angle limiting braking protection mechanism, characterized in that: include: A power motor is arranged on the frame and has a driving shaft to output swing power; Electric cylinder, used to output safety braking force at the high point of the swing; A positioning wheel, rotatably arranged at the outer end of the driving shaft, wherein the positioning wheel is provided with a C-shaped regulating groove on the inner side; A support plate is fixedly arranged on the frame; Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rod is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and braking is released when disengaged; The positioning arm is fixedly mounted on the driving shaft, and the positioning arm is provided with a positioning shaft which is embedded in the C-shaped regulating groove and moves with the positioning arm; The driving shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped regulating groove, it drives the positioning wheel to rotate in coordination; when the electric cylinder applies force, the brake rod engages with the positioning wheel to brake the positioning wheel and set the maximum swing angle of the driving shaft.

37. The swing angle limiting braking protection mechanism according to claim 36, characterized in that: The positioning wheel disc is a positioning gear, the brake rod is a brake arm, and a rack is inlaid on the front end of the brake arm, which meshes with the positioning gear during braking.

38. The swing angle limiting braking protection mechanism according to claim 36, characterized in that: A rope groove wheel is arranged outside the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to a cylindrical threaded tension spring after winding through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

39. The swing angle limiting braking protection mechanism according to claim 36, characterized in that: The steering wheel assembly comprises a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

40. The swing angle limiting braking protection mechanism according to claim 36, characterized in that: There are two power motors, and two sets of corresponding electric cylinders, positioning gears, and positioning arms; A seventh photoelectric switch sensor is arranged on a positioning wheel. When the driving shaft swings upward to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal to make the driving shaft swing downward in the opposite direction. The other positioning gear is provided with an eighth photoelectric switch sensor, which is spatially offset from the seventh photoelectric switch sensor; when the drive shaft swings upward to a high position, if the seventh photoelectric switch sensor fails and does not send a reverse signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor, and sends a reverse signal before the mechanical brake, so that the drive shaft swings downward in the opposite direction; 41. The swing angle limiting braking protection mechanism according to claim 30 or 36, characterized in that: The included angle formed by the two end points of the C-shaped regulating groove and the center of the positioning wheel satisfies 90 degrees < included angle ≤ 180 degrees.

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