Quadriceps femoris training chair capable of automatically adapting to position and movement of knee joint
By designing a quadriceps training chair that automatically adapts to the position and activity of the knee joint, and using structures such as armrests, guide rails and sliders, infinite adjustment of movement resistance is achieved, solving the problem of traditional training chairs requiring precise adjustment and improving the safety and comfort of rehabilitation training.
Patent Information
- Application Number
- CN202510909824.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-02
- Publication Date
- 2025-09-16
AI Technical Summary
Traditional quadriceps training chairs require precise adjustment of the device's rotation axis and the knee joint axis to ensure they are aligned, which leads to uncoordinated movements, friction, and dislocation, affecting rehabilitation effects and patient comfort.
A quadriceps training chair that automatically adapts to the position and activity of the knee joint is designed. The chair adopts structures such as an armrest, a guide rail, a slider, a connecting rod and a traction rope. By adjusting the position of the slider on the guide rail, the motion resistance can be infinitely adjusted to adapt to individual differences.
It improves the safety, effectiveness and comfort of rehabilitation training, promotes the recovery of knee joint function and improves the quality of life of patients.
Smart Images
Figure CN120643877A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of medical devices, and in particular to a quadriceps training chair. Background Art
[0002] In daily life, knee dysfunction is common due to various factors such as sports injuries and post-operative rehabilitation. This dysfunction will not only seriously affect the patient's ability to carry out daily activities, but may also cause a series of problems such as knee pain, instability and even further joint damage. The quadriceps training chair is a very effective rehabilitation training equipment. By exercising the key muscle groups of the lower limbs of the human body, it plays a significant role in improving the body's support capacity, maintaining knee joint stability, and completing daily walking and other movements. However, most of these traditional quadriceps training chairs adopt a single-axis design. During the training preparation process, it is necessary to precisely adjust the rotating shaft of the device and the axis of the knee joint to a collinear position. Otherwise, the movement of the device and the movement of the knee joint will be inconsistent, resulting in friction, dislocation and other additional forces, causing discomfort to the patient and even affecting the rehabilitation effect. Summary of the Invention
[0003] The technical problem to be solved by the present invention is: how to provide a quadriceps training chair that automatically adapts to the position and activity of the knee joint to solve the problems existing in the background technology.
[0004] The technical solution adopted by the present invention is: a quadriceps training chair that automatically adapts to the position and activity of the knee joint, comprising a training chair body (1), an armrest frame (2), a guide rail (3), a slider (4), a first connecting rod (6), a second connecting rod (7), a base (8), a calf fixing device (9), a rotating wheel (10), a traction rope (11), and a counterweight (12); the armrest frame (2) and the guide rail (3) are each provided with two and are symmetrically fixed on both sides of the training chair body (1); there are two sliders (4), one of which is installed on each guide rail; there are two first connecting rods (6) and two second connecting rods (7), each of which is located on both sides of the training chair body (1); One end of each first connecting rod is hinged on a different slider, the other end of each first connecting rod is hinged to one end of a different second connecting rod, and the other end of each second connecting rod is hinged to one side of the base (8). There are two calf fixing devices (9) and they are symmetrically connected and fixed on the base (8). There are two rotating wheels (10) and the rotating shaft of each rotating wheel is fixed on a slider. The hinged end of each first connecting rod and the slider is fixed to a rotating wheel and is located on the front side of the rotating wheel. There are two traction ropes (11) and two counterweights (12). The upper end of each traction rope is fixedly connected to the rear outer ring of a rotating wheel, and the lower end of each traction rope is fixedly connected to a counterweight.
[0005] A tightening knob (5) is mounted on each slider.
[0006] Both ends of each guide rail are fixed to a handrail frame and the length direction of the guide rail is parallel to the plane where the first connecting rod is located. Each slider is a tubular structure sleeved on the guide rail. Each slider has a through hole with an internal thread connected to the inside of the slider. The fastening knob (5) is a stud, and a stud is installed on each through hole.
[0007] Each handrail is an N-shaped structure, and each handrail is parallel to the plane where the first connecting rod and the second connecting rod are located.
[0008] Each guide rail is fixed on both sides of the middle part of the handrail frame.
[0009] Each guide rail is a strip with a rectangular cross section, and each slider is a rectangular parallelepiped with a hollow interior and a U-shaped cross section. The cross-sectional shape of the guide rail is the same as that of the slider.
[0010] During use, the user sits on the quadriceps training chair and then fixes the calf through the calf fixing device, avoiding the complicated operations of the existing technology (such as the use of a single-axis design quadriceps training chair), reducing the discomfort caused by knee joint movement when using the existing quadriceps training chair, and at the same time, by adjusting the position of the slider on the guide rail, the movement resistance can be infinitely adjusted to achieve excellent rehabilitation effect.
[0011] The beneficial effects of the present invention are: the present invention can automatically adjust the positional relationship between the movement mechanism and the knee joint according to the individual differences of the user, and automatically adapt to the activities of the knee joint, thereby improving the safety, effectiveness and comfort of rehabilitation training, better promoting the recovery of knee joint function, and improving the quality of life of patients. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the principle of the automatic adaptation of the knee joint position and movement of the present invention; Figure 3 This is a schematic diagram of the movement principle of the mechanism of the present invention in which the resistance can be infinitely adjusted; Among them, 1. training chair body, 2. armrest frame, 3. guide rail, 4. slider, 5. tightening knob, 6. first connecting rod, 7. second connecting rod, 8. base, 9. calf fixing device, 10. rotating wheel, 11. traction rope, 12 counterweight block, 13. calf. DETAILED DESCRIPTION
[0013] like Figure 1As shown, a quadriceps training chair that automatically adapts to the position and activity of the knee joint includes a training chair body 1, an armrest frame 2, a guide rail 3, a slider 4, a first connecting rod 6, a second connecting rod 7, a base 8, a calf fixing device 9, a rotating wheel 10, a traction rope 11, and a counterweight 12.
[0014] like Figure 1 As shown, the training chair body 1 is an ordinary chair, including legs, a backrest, and a seat. The user sits on the seat and leans back on the backrest. The size of the training chair body 1 should be adapted to the user's body shape. It is divided into several grades according to the user group, such as children's training chairs, short training chairs, and fat training chairs. After all, the more adaptable the user is, the better.
[0015] The handrail frame 2 is used for the user to hold the handrail. When exercising, the legs need to exert force, and the hands need to rest on the handrail.
[0016] There are two armrest frames 2, two guide rails 3 and two sliders 4, which are fixed on both sides of the training chair body 1 in a symmetrical structure, and one slider is installed on each guide rail.
[0017] The guide rail and the slider cooperate with each other, and the slider needs to be able to move linearly on the guide rail, while the guide rail needs to be able to support the slider and its connecting parts.
[0018] In one embodiment, each handrail is an N-shaped structure made of steel bars, and each handrail is parallel to the plane where the first connecting rod and the second connecting rod are located. Each guide rail is fixed to both sides of the middle portion of the handrail. Both ends of each guide rail are fixed to a handrail, and the length direction of the guide rail is parallel to the plane where the first connecting rod is located. Each slider is a tubular structure that is sleeved on the guide rail, and each slider has a through hole with an internal thread connected to the interior of the slider. Each guide rail is a strip with a square cross-section, and each slider is a rectangular parallelepiped with a hollow interior and a U-shaped cross-section. The cross-sectional shape of the guide rail is the same as the cross-sectional shape of the slider.
[0019] Each slider is mounted with a fastening knob 5. In one embodiment, the fastening knob 5 is a stud, with one stud mounted in each through hole. The fastening knob 5 is used to position the slider to a fixed position on the guide rail. Depending on the user's body type, the slider and the guide rail are positioned in different positions. The guide rail and slider can meet the needs of users with widely varying body types.
[0020] In one embodiment, the first connecting rod 6 and the second connecting rod 7 are both long rectangular plates. There are two first connecting rods 6 and second connecting rods 7 and they are respectively located on both sides of the training chair body 1. One end of each first connecting rod is hinged to a different slider, and the other end of each first connecting rod is hinged to one end of a different second connecting rod. The other end of each second connecting rod is hinged to one side of the base 8. There are two calf fixing devices 9 and they are symmetrically connected and fixed to the base 8. There are two rotating wheels 10 and the rotating shaft of each rotating wheel is fixed to a slider. The hinged end of each first connecting rod and the slider is fixed to a rotating wheel and is on the front side of the rotating wheel. There are two traction ropes 11 and two counterweights 12. The upper end of each traction rope is fixed to the rear outer ring of a rotating wheel, and the lower end of each traction rope is fixed to a counterweight.
[0021] In one embodiment, the armrest, guide rail, slider, tightening knob, first connecting rod, second connecting rod, calf fixing device, rotating wheel, traction rope, and counterweight are distinguished by left and right, such as the armrest is divided into left armrest and right armrest, and the others are similar.
[0022] A left armrest is installed on the left side of the training chair body 1. The left armrest has a left guide rail, a left slider, and a left tightening knob on the left slider. The left tightening knob is used to lock or release the left slider so that it cannot move or can move in a straight line. The rotating shaft of the left-hand wheel is fixed on the left slider, and the left-hand wheel can rotate around its rotating shaft. The left first connecting rod is connected to the rotating shaft of the left-hand wheel with the rotating shaft of the left-hand wheel as a pin. The left first connecting rod is fixed to the left-hand wheel, and the left first connecting rod rotates with the rotating shaft of the left-hand wheel, that is, the left first connecting rod and the left-hand wheel rotate synchronously. The left first connecting rod is connected to the left second connecting rod by a pin. The base 8 is a cross bar, and the left second connecting rod is rotatably connected to one end of the base 8 (with the end of the left second connecting rod as a pin). The right side of the training chair body 1 adopts the same structure as the left side of the training chair body 1.
[0023] In one embodiment, the left calf restraint device includes a rotating drum, a triangular connecting block, and a strap. The rotating drum is mounted on a base 8 and is rotatably connected to the base 8. The triangular connecting block rigidly connects the rotating drum and the strap, which is used to restrain the left calf. In one embodiment, the strap is provided with Velcro for quick binding. The right calf restraint device has a similar structure to the left calf restraint device.
[0024] When the user performs rehabilitation training, he sits on the training chair body 1, binds the calf strap 10 to the user's calf position, loosens the tightening knob 5 and adjusts the position of the slider 4 on the guide rail 3, and then tightens the tightening knob 5 to fix the position of the slider 4. After that, the user can use the training chair to actively move the knee joint to achieve the purpose of quadriceps rehabilitation training.
[0025] To further illustrate the implementation of the present invention of automatically adapting the knee joint position and activity, Figure 2 For explanation. Figure 2 In the figure, hinge A corresponds to the hinge connecting the slider and the first link, hinge B corresponds to the hinge connecting the first link and the second link, hinge C corresponds to the hinge connecting the second link and the strap base 8, and hinge D corresponds to the user's knee joint.
[0026] After the calf fixing device is tied to the user's calf, the user's calf is fixedly connected to the strap base 8. Figure 2 In the figure, the user's lower leg 13 and base 8 form a single component. Slider 4 is fixed on guide rail 3. These components and the hinge form a planar hinge four-bar mechanism. Clearly, this mechanism has one degree of freedom, a defined range of motion, and the position and motion of hinge D do not affect the mechanism's degrees of freedom. This demonstrates that the lower limb training mechanism of the present invention automatically adapts to the position and movement of the knee joint.
[0027] In order to further illustrate that the resistance of the training mechanism of the present invention can be infinitely adjusted, Figure 3 In Figure 3 In, yes Figure 3 The mechanical analysis of the mechanism is carried out. Among them, the force exerted by the counterweight 12 on the pulley 10 is G , the force G The pulley 10 and the first connecting rod integral with the pulley 10 generate a counterclockwise torque. The magnitude of this torque is related to the weight of the counterweight. When the user uses the training mechanism to perform knee extension exercises, the user's calf rotates counterclockwise, and the force exerted by the second connecting rod on the first connecting rod is F , the velocity of point B on the first link is v ,but F and v The angle between them is the pressure angle α Obviously, the pressure angle α The smaller the resistance, the G Required force F The smaller it is, the more equivalent resistance the first link needs to overcome to rotate. G e The smaller, G e = F When the first link is under balanced force, the formula is: Gr 26 = Fl 22 cos α .in, r 26 is the radius of the pulley 10, l 22 is the length of the first connecting rod. Then the equivalent resistance can be obtained Ge The expression is: G e = F = Gr 26 / ( l 22 cos α ). Obviously, when the position of the slider moves along the guide rail toward the hinge D, the angle between the first link and the second link gradually decreases, and the pressure angle α Gradually decrease, equivalent resistance G e When the position of the slider moves along the guide rail in the direction away from the hinge D, the angle between the first link and the second link gradually increases, and the pressure angle α Gradually increase, equivalent resistance G e The value of also gradually increases.
[0028] Therefore, in this embodiment, the resistance can be infinitely adjusted by adjusting the position of the slider 4 on the guide rail 3, thereby ensuring the safety of the quadriceps rehabilitation training and achieving the effect of accurate rehabilitation.
Claims
1. A quadriceps training chair that automatically adapts to the position and movement of the knee joint, characterized by: The invention comprises a training chair body (1), an armrest frame (2), a guide rail (3), a slider (4), a first connecting rod (6), a second connecting rod (7), a base (8), a calf fixing device (9), a rotating wheel (10), a traction rope (11), and a counterweight (12); the armrest frame (2) and the guide rail (3) are each provided with two and are fixed on both sides of the training chair body (1) in a symmetrical structure; the slider (4) is provided with two and one slider is installed on each guide rail; the first connecting rod (6) and the second connecting rod (7) are each provided with two and are respectively located on both sides of the training chair body (1); one end of each first connecting rod is hinged to a different slider The other end of each first connecting rod is hinged to one end of a different second connecting rod, and the other end of each second connecting rod is hinged to one side of the base (8). There are two calf fixing devices (9) and they are symmetrically connected and fixed on the base (8). There are two rotating wheels (10) and the rotating shaft of each rotating wheel is fixed on a slider. The hinged end of each first connecting rod and the slider is fixed to a rotating wheel and is located on the front side of the rotating wheel. There are two traction ropes (11) and two counterweights (12). The upper end of each traction rope is fixedly connected to the rear outer ring of a rotating wheel, and the lower end of each traction rope is fixedly connected to a counterweight.
2. The quadriceps training chair that automatically adapts to the position and movement of the knee joint according to claim 1, characterized in that: A tightening knob (5) is mounted on each slider.
3. The quadriceps training chair that automatically adapts to the position and movement of the knee joint according to claim 2, characterized in that: Both ends of each guide rail are fixed to a handrail frame and the length direction of the guide rail is parallel to the plane where the first connecting rod is located. Each slider is a tubular structure sleeved on the guide rail. Each slider has a through hole with an internal thread connected to the inside of the slider. The fastening knob (5) is a stud, and a stud is installed on each through hole.
4. The quadriceps training chair that automatically adapts to the position and movement of the knee joint according to claim 1, characterized in that: Each handrail is an N-shaped structure, and each handrail is parallel to the plane where the first connecting rod and the second connecting rod are located.
5. The quadriceps training chair that automatically adapts to the position and movement of the knee joint according to claim 4, characterized in that: Each guide rail is fixed on both sides of the middle part of the handrail frame.
6. The quadriceps training chair that automatically adapts to the position and movement of the knee joint according to claim 1, characterized in that: Each guide rail is a strip with a rectangular cross section, and each slider is a rectangular parallelepiped with a hollow interior and a U-shaped cross section. The cross-sectional shape of the guide rail is the same as that of the slider.