Knee flexion and extension mechanism and knee training device
By designing guide plates and limiting columns for the knee flexion and extension mechanism, the problem of existing knee joint rehabilitation equipment being limited to individual training has been solved, achieving stable resistance supply and equipment versatility, while reducing cost and size.
Patent Information
- Application Number
- CN202423000866.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Existing knee joint rehabilitation equipment can only perform knee extension or flexion training separately, resulting in high equipment cost and large size. In addition, the resistance rope disappears instantly during forward and reverse rotation, resulting in poor physical sensation.
A knee flexion and extension mechanism was designed. Through the combination of guide plates, limit posts and guide wheels, the resistance rope is ensured to provide stable resistance during the forward and reverse rotation of the knee training, so as to realize the dual function of knee extension and knee flexion training.
The knee joint training device achieves balanced resistance during forward and reverse rotation, providing stable training resistance, reducing equipment cost and size.
Smart Images
Figure CN223555429U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of medical rehabilitation equipment, specifically relates to a knee flexion and extension mechanism and knee training device. BACKGROUND
[0002] With the development of society, the progress of science and technology, sports rehabilitation has been more and more paid attention to, and all large hospitals in the country have specially established rehabilitation departments, and various sports rehabilitation centers have gradually increased.
[0003] For the rehabilitation treatment training of knee joint, the following is often adopted: knee joint straightening exercise and knee joint flexion exercise for rehabilitation training.
[0004] However, most of the knee joint sports rehabilitation equipment on the market currently only has one exercise function, either only knee joint straightening exercise or only knee joint flexion exercise, that is, two independent knee straightening training devices and knee flexion training devices are needed for separate training for the rehabilitation treatment of knee joint, which increases the investment of users on the equipment and has high cost, and occupies a large volume.
[0005] Secondly, for the knee joint sports rehabilitation equipment that can be reversed to perform knee straightening and knee flexion training, one end of the resistance rope is fixed on the rotating guide wheel, and the other end directly extends outward, there is no structure around the pulley, the resistance rope is in an initial tension state, the guide wheel is stretched when the guide wheel is reversed, the resistance rope provides resistance when the guide wheel rotates, but when the guide wheel is reversed at the initial position, the resistance rope will first change from the tension state to the relaxed state and then change from the tension state to the relaxed state, and finally change from the tension state to the relaxed state, in the process of changing from the tension state to the relaxed state and then changing from the tension state to the relaxed state, the resistance provided by the resistance rope will disappear instantaneously, and then the force acting on the knee of the patient will disappear instantaneously, resulting in poor body sensation. INVENTION CONTENTS
[0006] The utility model aims at overcoming the existing technical defects, and provides a knee flexion and extension mechanism and knee training device, which has the functions of knee straightening training and knee flexion training, and does not have the problem of sudden failure of resistance in the process of straightening and flexing the knee.
[0007] In the first aspect, in order to solve the above technical problems, the utility model provides a knee flexion and extension mechanism, which comprises:
[0008] A fixed seat is provided with a supporting column;
[0009] A guide piece, one end of which is rotatably arranged on one side of the support column, and the other end of which is rotatably provided with a first pulley;
[0010] A guide wheel, which is rotatably arranged on the support column and located outside the guide piece, and one side of which is provided with a second limiting column located below the guide piece;
[0011] A leg force frame, one end of which is fixed to the outside center of the guide wheel, and the other end of which extends outward;
[0012] A resistance rope, one end of which is wound around the first pulley and then fixed to the guide wheel to exert resistance on the rotation process of the guide wheel, and the other end of which extends outward.
[0013] Further, the rotating end of the guide piece is provided with a limiting part below the first limiting column.
[0014] Further, the second limiting column is located outside the circumferential rotation area of the limiting part, and the first limiting column is located inside the circumferential rotation area of the second limiting column.
[0015] Further, a gap is formed between the guide wheel and the support column for the rotation of the second limiting column.
[0016] Further, the outside end of the guide piece extends beyond the outer circumference of the guide wheel, and the first pulley is arranged on one side of the guide wheel.
[0017] Further, a first guide groove is recessed in the outer circumference of one side of the guide wheel close to the fixed seat, and a second guide groove is recessed in the outer circumference of the other side of the guide wheel away from the fixed seat, and the circumferential lines of the second guide groove and the first guide groove are arranged as inner and outer rings, one end of the resistance rope is fixed to one end of the second guide groove through a detachable fixing block, and the fixing block is located below the guide piece.
[0018] Further, the fixed seat is further provided with a second pulley located below the guide wheel, and one end of the resistance rope away from the fixed block extends outward along the second guide groove and the second pulley.
[0019] Further, the leg force frame is an L-shaped frame composed of a connecting rod and a force rod, one end of the connecting rod is fixed to the outside center of the guide wheel, the other end of the connecting rod extends along the radial direction of the guide wheel and extends out of the guide wheel, one end of the force rod is fixed or detachably connected to the end of the connecting rod, and the other end of the force rod extends outward along the axial direction of the guide wheel.
[0020] Further, the force bearing rod is sleeved with a soft protective sleeve; preferably a cotton sleeve or a rubber sleeve.
[0021] In a second aspect, the utility model also provides a knee training device, including the host computer that is internally equipped with servo motor, still include the knee flexion mechanism of as any one of first aspect, the other end of resistance rope is wound on the rotating shaft of servo motor.
[0022] The utility model has the advantages of:
[0023] In the utility model, by increasing the guide plate, and utilizing the cooperation of the guide plate and the first limiting column and the second limiting column, when the knee force frame is pressed downward by the force applied by the leg to perform the knee bending training, one end of the guide plate is clamped by the first limiting column and cannot rotate downward, at this time, the process of rotating the guide plate downward will stretch the resistance rope, thereby generating resistance in the process of rotating downward; when the knee force frame is lifted upward by the force applied by the leg to perform the knee stretching training, the second limiting column will push the guide plate upward, thereby driving the guide plate and the guide wheel to rotate upward together, the process of rotating the guide plate upward will also stretch the resistance rope, thereby generating resistance in the process of rotating upward; that is, through the action of the guide plate, the knee flexion mechanism in the utility model has the dual functions of knee stretching training and knee bending training, and no matter the guide wheel is rotating forward or reversing, the end of the resistance rope is always on the left side of the guide plate, and the resistance will not suddenly disappear, so the resistance of the knee force frame on the operator will not suddenly change and disappear.
[0024] Additional aspects and advantages of the utility model will be given in part in the following description, which will become apparent from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0025] The drawings described herein are used to provide further understanding of the utility model, constitute a part of this application, and do not constitute improper limitation to the utility model, and in the drawings:
[0026] Figure 1 It is the schematic diagram of the knee flexion mechanism in the embodiment;
[0027] Figure 2 It is Figure 1 It is the enlarged schematic diagram of A in the embodiment;
[0028] Figure 3 It is the schematic diagram when the knee flexion mechanism in the embodiment rotates upward;
[0029] Figure 4 It is the schematic diagram when the knee flexion mechanism in the embodiment rotates downward;
[0030] Figure 5 It is the schematic diagram of the knee training device in the embodiment 2. Detailed Implementation
[0031] To better understand the technical content of this utility model, the following will further introduce and explain this utility model in conjunction with the accompanying drawings and specific embodiments. It should be noted that if there are descriptions such as "first" and "second" in the text, they are used to distinguish different components, etc., and do not represent the order of priority, nor do they limit "first" and "second" to be different types.
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0033] Example 1
[0034] like Figures 1 to 4 As shown, the knee flexion and extension mechanism 100 of this embodiment includes a fixed base 1, a guide plate 2, a guide wheel 3, a leg support frame 4, and a resistance rope 5. The fixed base 1 is vertically arranged, and a support column 10 extending to the right and outward is provided on its right side. The end of the support column 10 is provided with a fixed shaft 11 perpendicular to it. One end of the guide plate 2 is rotatably mounted on the fixed shaft 11 through a bearing, and the other end of the guide plate 2 is rotatably mounted with a first pulley 21. A first limiting post 12 is provided on the support column 10 to limit the downward rotation stroke of the guide plate 2, that is, the first limiting post 12 is located on the upper side of the rotating end of the guide plate 2. The guide wheel 3 is rotatably mounted on the fixed shaft 11 through a bearing and is located on the guide wheel 5. On the outer side of the guide plate 2, a second limiting post 31 is provided on the side of the guide wheel 3 near the guide plate 2, which can be used to support the guide plate 2 upwards; one end of the leg support frame 4 is fixed to the outer center of the guide wheel 3, and the other end extends outwards; one end of the resistance rope 5 is wound from left to right through the first pulley 21 and then extends in the opposite direction and is fixed to the guide wheel 3, so that the fixing point between the resistance rope and the guide wheel is located on the left side of the guide plate 2 and the first pulley 21, so as to apply resistance to the rotation process of the guide wheel; the other end of the resistance rope extends outwards for connection with the main unit that provides resistance in the external knee training device.
[0035] The aforementioned knee flexion and extension mechanism, such as Figure 4 As shown, when the knee support frame is pressed downwards by the force applied by the leg during knee flexion training, one end of the guide plate is stopped by the first limiting post and will not rotate downwards. During the downward rotation of the guide plate, the resistance rope is stretched, thus generating resistance. Figure 3As shown, when the knee force frame is lifted upward by the force applied by the leg for knee extension training, the second limiting column will push against the guide plate upward, and then drive the guide plate to rotate upward together with the guide wheel, and the upward rotation of the guide plate will also stretch the resistance rope, thereby generating resistance in the process of upward rotation; that is, through the action of the guide plate, the knee flexion and extension mechanism in the utility model has the dual functions of knee extension training and knee flexion training, and no matter the guide wheel is rotating forward or reversing, the end of the resistance rope is always on the left side of the guide plate, and the resistance will not suddenly disappear, and the resistance of the knee force frame on the operator will not suddenly change and disappear.
[0036] In an embodiment, as shown in the figure, in order to realize the force bearing of the leg, the leg force bearing frame 4 is an L-shaped frame composed of a connecting rod 41 and a force bearing rod 42, one end of the connecting rod 41 is fixed to the middle of the outer side of the guide wheel 3, the other end extends along the radial direction of the guide wheel 3 and extends out of the guide wheel 3; one end of the force bearing rod 42 is fixed or detachably connected to the end of the connecting rod 41, and the other end extends outward along the axial direction of the guide wheel 3, so that the leg can be placed above or below the force bearing rod 42, and the leg force bearing frame 4 and the guide wheel 3 are driven to rotate downward or upward by the force of the leg. Figure 1 As preferred, as shown in the figure, a soft protective sleeve 43 is sleeved on the force bearing rod 42, which plays a buffering role for the leg and is used for protecting the leg; the protective sleeve 43 is preferably a cotton sleeve or a rubber sleeve, etc.
[0037] Figure 1 In an embodiment, as shown in the figure, the lower side of the rotating end of the guide piece 2 is provided with a limiting portion 22 located below the first limiting column 12, that is, the first limiting column 12 is located in the circumferential region covered by the limiting portion 22 when the limiting portion 22 rotates, so that under the action of its own gravity, the limiting portion 22 initially abuts against the first limiting column 12.
[0038] In an embodiment, as shown in the figure, in order to avoid interference and blocking of the first limiting column 12 and the limiting portion 22 to the forward and reverse rotation of the guide wheel 3, the second limiting column 31 is located outside the circumferential rotation region of the limiting portion 22, that is, the circumferential region of the limiting portion 22 when rotating is located inside the second limiting column 31, the limiting portion 22 and the second limiting column 31 do not intersect in the rotation process, and the first limiting column 12 is located inside the circumferential rotation region of the second limiting column 31, that is, the circumferential region of the second limiting column 31 when rotating is located outside the first limiting column 12, the second limiting column 31 and the first limiting column 12 do not intersect in the rotation process, so that the guide wheel can rotate through the limiting portion 22 and the first limiting column 12 in turn when rotating downward, realizing the free rotation of the guide wheel in forward and reverse directions. Figures 1 to 2 As preferred, as shown in the figure, the second limiting column 31 is provided with a limiting portion 32 located below the first limiting column 12, that is, the first limiting column 12 is located in the circumferential region covered by the limiting portion 32 when the limiting portion 32 rotates, so that under the action of its own gravity, the limiting portion 32 initially abuts against the first limiting column 12.
[0039] Figures 1 to 4 As preferred, as shown in the figure, the second limiting column 31 is provided with a limiting portion 32 located below the first limiting column 12, that is, the first limiting column 12 is located in the circumferential region covered by the limiting portion 32 when the limiting portion 32 rotates, so that under the action of its own gravity, the limiting portion 32 initially abuts against the first limiting column 12.
[0040] As preferred, as shown in the figure, the second limiting column 31 is provided with a limiting portion 32 located below the first limiting column 12, that is, the first limiting column 12 is located in the circumferential region covered by the limiting portion 32 when the limiting portion 32 rotates, so that under the action of its own gravity, the limiting portion 32 initially abuts against the first limiting column 12. Figures 1 to 4 As shown, a gap is formed between the guide wheel 3 and the support column 10 for the second limiting column 31 to rotate through, i.e. the width of the gap is greater than the protruding height of the second limiting column 31, so that the second limiting column 31 rotates through the support column 10.
[0041] As preferred, the outer side end of the guide piece 2 extends beyond the outer periphery of the guide wheel 3, and the first pulley 21 is arranged on the side of the guide piece 2 close to the guide wheel 3, so that the first pulley 21 is located on the side of the outer periphery of the guide wheel 3, i.e. the first pulley 21 and the guide wheel are in the same vertical plane, facilitating the fixing of the resistance rope 5 passing through the first pulley 21 on the guide wheel 3.
[0042] In an embodiment, a first guide groove 32 is recessed on the outer periphery of the side of the guide wheel 3 close to the fixed base 1, and a second guide groove 33 is recessed on the outer periphery of the side of the guide wheel 3 away from the fixed base 1, and the circumferential lines of the second guide groove 33 and the first guide groove 32 are arranged as inner and outer rings, i.e. the first guide groove 32 and the second guide groove 33 are on different circumferences, and a step is formed between the first guide groove 32 and the second guide groove 33. One end of the resistance rope 5 is fixed to one end of the second guide groove 33 after passing through the first pulley 21, and the fixed block 34 is located below the guide piece 2, i.e. the one end of the resistance rope is fixed to the left side of the guide piece 2 and the first pulley. Through the arrangement of the second guide groove 33, in the process of downward rotation of the guide wheel 3, the stretched resistance rope 5 will be wound in the second guide groove 33 (as shown in Figure 1 and Figure 3 As shown), forming limiting and guiding of the resistance rope, ensuring smooth downward rotation; preferably, the fixed block 34 is fixed to the guide wheel 3 by screw connection.
[0043] As preferred, the fixed base 1 is further provided with a second pulley 13 below the guide wheel 3, and one end of the resistance rope 5 away from the fixed block 34 (i.e. the outwardly extending end) extends outwardly along the second guide groove 33 and the second pulley 13, and the resistance rope 5 passes between the guide wheel 3 and the second pulley 13, and is pressed in the first guide groove 32 by the action of the second pulley 13, so that in the process of upward rotation of the guide wheel 3, the stretched resistance rope 5 will be wound in the first guide groove 32 (as shown in Figure 1 and Figure 4 As shown), forming limiting and guiding of the resistance rope, ensuring smooth upward rotation.
[0044] Embodiment 2
[0045] As shown in Figures 1 to 5As shown, the embodiment provides a knee training device, which comprises a main machine 200 internally provided with a servo motor 300, and a knee flexion and extension mechanism 100 as described in Embodiment 1, and one end of the resistance rope 5 extending outward is wound on the rotating shaft of the servo motor 300; in the structure, the servo motor 300 is used to provide stretching resistance for the resistance rope 5, and after the servo motor 300 is powered on, the default direction of rotation is to make the resistance rope retract, the servo motor reverses when the operator stretches the resistance rope outward for knee training, and the servo motor rotates forward to retract the resistance rope when the operator does not exert force.
[0046] In an embodiment, a third pulley 400 is further arranged below the servo motor 300 in the main machine 200, and one end of the resistance rope 5 is wound on the rotating shaft of the servo motor 300 after being wound on the third pulley 400 from bottom to top.
[0047] In an embodiment, a belt wheel 301 is arranged on the rotating shaft of the servo motor 300, and one end of the resistance rope 5 is wound on the belt wheel.
[0048] The technical solutions provided by the embodiments of the utility model are described in detail above, and the principles and implementation modes of the embodiments of the utility model are described by applying specific examples; the above embodiment descriptions are only applicable to helping understand the principles of the embodiments of the utility model; meanwhile, for those skilled in the art, the embodiments of the utility model will have changes in specific implementation modes and application ranges, and the content of the specification should not be understood as limiting the utility model.
Claims
1. A knee flexion-extension mechanism characterized by, The knee flexion and extension mechanism comprises a fixed base, a support column arranged on the fixed base, a guide piece, one end of which is rotatably arranged on one side of the support column, the other end of which is rotatably provided with a first pulley, a first limiting column arranged on the support column to limit the downward rotation stroke of the guide piece, a guide wheel rotatably arranged on the support column and located outside the guide piece, a second limiting column protruding from one side of the guide wheel and located below the guide piece, a leg force receiving frame, one end of which is fixed to the outside center of the guide wheel and the other end of which extends outward, and a resistance rope, one end of which is wound around the first pulley and then fixed to the guide wheel to exert resistance on the rotation process of the guide wheel, the other end of which extends outward. The rotation end of the guide piece is provided with a limiting part below the first limiting column. The second limiting column is located outside the circumferential rotation area of the limiting part, and the first limiting column is located inside the circumferential rotation area of the second limiting column. The guide wheel and the support column form a gap for the rotation of the second limiting column. The outside end of the guide piece extends beyond the outer circumference of the guide wheel, and the first pulley is arranged on one side of the guide wheel. The outer circumference of one side of the guide wheel close to the fixed base is concavely provided with a first guide groove, and the outer circumference of the other side of the guide wheel away from the fixed base is concavely provided with a second guide groove, the circumferential lines of the second guide groove and the first guide groove are arranged as inner and outer rings, one end of the resistance rope is fixed to one end of the second guide groove through a detachable fixing block, and the fixing block is located below the guide piece.
2. The knee flexion mechanism of claim 1, wherein, The fixed base is further provided with a second pulley below the guide wheel, and one end of the resistance rope away from the fixing block extends outward along the second guide groove and the second pulley.
3. The knee flexion mechanism of claim 2, wherein, The leg force receiving frame is an L-shaped frame composed of a connecting rod and a force receiving rod, one end of the connecting rod is fixed to the outside center of the guide wheel, the other end of the connecting rod extends along the radial direction of the guide wheel and extends out of the guide wheel, one end of the force receiving rod is fixed or detachably connected to the end of the connecting rod, and the other end of the force receiving rod extends outward along the axial direction of the guide wheel.
4. The knee flexion mechanism of claim 3, wherein, A soft protective sleeve is sleeved on the force receiving rod.
5. The knee flexion mechanism of claim 4, wherein, The knee flexion and extension mechanism further comprises a servo motor, the other end of the resistance rope is wound around the rotating shaft of the servo motor.
6. The knee flexion mechanism of claim 5, wherein, 7. The knee flexion mechanism of claim 6, wherein, 8. The knee flexion mechanism of claim 7, wherein, 9. The knee flexion mechanism of claim 8, wherein, 10. A knee training device comprising a main unit having a servo motor inside, characterized by,