Ankle plantar flexion and dorsiflexion training device

Abstract

To provide a foot joint bottom dorsal flexion training device which allows a user to do exercise in a broad movable area by putting the heels down to a sufficient dorsal flexion angle, and to perform plantar flexion exercise at a high speed by reducing exercise load.SOLUTION: A foot joint bottom dorsal flexion training device 100 includes a body section 10 and a pedal section 20. The body section 10 includes a pedestal part 11, a bottom 12, an energization part 14, and a rotation support part 15. The pedal section 20 includes a base end part 21, a central part 22, and a tip part 23. The pedal section 20 is configured to be positioned in a state of being rotated around a rotation shaft 15b, the tip part 23 to the pedestal part 11 at the bottom 12 side in an opposite direction where the pedestal part 11 and the bottom 12 are opposed to each other. An energization part 14 is configured to energize the pedal section 20 to the bottom 12 at the pedestal part 11 side in the opposite direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an ankle joint plantar flexion and dorsiflexion training device. [Background technology]

[0002] Ankle plantar flexion function is an important lower limb function related to various athletic performances, such as walking, running, and jumping. Pushing off with ankle plantar flexion during walking contributes to the generation of forward propulsion. In addition to plantar flexion strength, plantar flexion velocity is also an important factor in ankle plantar flexion function. Plantar flexion velocity is the joint angular velocity when plantar flexion is performed as quickly as possible without load. Plantar flexion velocity may be a more important function for athletic performance than plantar flexion strength.

[0003] Improving plantar flexion speed requires exercise with a wide range of motion and high speed. Calf raises (heel raise exercise) are a typical plantar flexion strength training exercise. A wide range of motion and high speed calf raises can improve ankle plantar flexion function (muscle strength and speed of movement). Improved ankle plantar flexion function can be expected to lead to improved athletic performance. A typical calf raise involves standing on a flat surface and repeatedly raising and lowering the heel. Calf raises using a step involve standing on a step with the heel sticking out, lowering the heel as far as possible, and then repeatedly raising it up.

[0004] For example, Utility Model Registration No. 3230391 (Patent Document 1) describes a toe-standing facilitating exercise device that uses a compression coil spring to push up the heel from under it when standing on tiptoes, facilitating tiptoe standing. Specifically, a sole mounting plate is provided on a base via a compression coil spring. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3230391 Summary of the Invention [Problem to be solved by the invention]

[0006] In typical calf raises, the heel is lowered while standing on a flat floor, making it difficult to lower the heel to a sufficient dorsiflexion angle. Therefore, it is difficult to exercise over a wide range of motion. In calf raises using a step, the exercise load is large, making it difficult to perform plantar flexion at high speeds. In the facilitation exercise device described in the above publication, a plantar support plate is attached to the base via a compression coil spring, making it difficult to lower the heel to a sufficient dorsiflexion angle. Therefore, it is difficult to exercise over a wide range of motion.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide an ankle joint plantar flexion and dorsiflexion training device that allows exercise over a wide range of motion by lowering the heel to a sufficient dorsiflexion angle, and that allows plantar flexion exercise to be performed at high speed by reducing the exercise load. [Means for solving the problem]

[0008] The ankle joint plantar flexion training device of the present invention includes a main body and a pedal connected to the main body. The main body includes a base, a bottom facing the base, a biasing portion configured to bias the pedal, and a rotation support portion configured to rotatably support the pedal. The rotation support portion includes a bearing and a rotation shaft rotatably supported by the bearing. The pedal includes a base end supported by the rotation shaft, a central portion connected to the base end, and a tip end located on the opposite side of the central portion from the base end. The pedal unit is configured so that the distance from the bottom increases from the base end to the tip end when the pedal unit is biased by the biasing unit when the user's heel is not placed on it. The pedal unit is configured to be rotatable about a rotation axis so that the distance from the bottom decreases from the base end to the tip end when the user's heel is placed on it and the heel is lowered. The pedal is configured to position the tip portion toward the bottom portion relative to the base portion in the opposing direction in which the base portion and the bottom portion face each other when rotated around the rotation axis. The biasing portion is configured to bias the pedal portion toward the base portion relative to the bottom portion in the opposing direction in which the base portion and the bottom portion face each other. The biasing portion includes a torsion spring and a shaft configured to support the torsion spring. The torsion spring includes a winding portion and an extending portion configured to extend radially outward from the winding portion. The torsion spring is configured such that the extending portion biases the pedal portion when the shaft is inserted through the winding portion of the torsion spring. The shaft is disposed between the rotation axis and the bottom portion in an opposing direction in which the base portion and the bottom portion face each other. The pedal portion includes a contact portion. The contact portion is configured to contact the extending portion of the torsion spring and is disposed in a central portion of the pedal portion. The extending portion of the torsion spring and the contact portion of the pedal portion are not fixed to each other. [Effects of the Invention]

[0009] The ankle joint plantar flexion and dorsiflexion training device of the present invention allows plantar flexion exercises to be performed over a wide range of motion by lowering the heel to a sufficient dorsiflexion angle, and by reducing the exercise load, plantar flexion exercises can be performed at high speed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a schematic configuration of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment.

[0022] FIG. [Figure 2] 1 is a front view showing a schematic configuration of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment.

[0022] FIG. [Figure 3] FIG. 1 is a rear view showing the outline of the configuration of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment. [Figure 4] 1 is a side view showing a schematic configuration of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment.

[0022] FIG. [Figure 5] 1 is a cross-sectional view showing a schematic configuration of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment. FIG. [Figure 6] FIG. 1 is a cross-sectional view showing a schematic configuration of a first modified example of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment. [Figure 7] FIG. 10 is a rear view showing the schematic configuration of a modified example 2 of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment. [Figure 8] FIG. 10 is a side view showing a schematic configuration of a second modified example of an ankle joint plantar flexion and dorsiflexion training device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, in which: FIG.

[0012] The configuration of an ankle joint plantar flexion and dorsiflexion training device 100 according to an embodiment will be described with reference to Figures 1 to 5. As shown in Figure 1, the ankle joint plantar flexion and dorsiflexion training device 100 according to an embodiment is intended to improve the ankle joint plantar flexion and dorsiflexion function. The ankle joint plantar flexion and dorsiflexion training device 100 comprises a main body 10 and a pedal 20. The pedal 20 is connected to the main body 10. Figure 5 shows the pedal 20 rotating.

[0013] As shown in Figures 1 and 2, the main body 10 includes a base 11, a bottom 12, side portions 13, a biasing portion 14, and a rotation support portion 15. The base 11 is configured so that the toes of a user can be placed on it. The base 11 is configured in a plate shape. The base 11 includes a top surface 11a. The top surface 11a may have an anti-slip function. The bottom 12 is configured to face the base 11. The bottom 12 is configured in a plate shape. The bottom 12 includes a bottom surface 12a. The bottom 12 includes a first portion 121 and a second portion 122. The first portion 121 and the second portion 122 are arranged with a gap between them. The side portions 13 are configured to connect the base 11 and the bottom 12. The side portions 13 are configured in a plate shape.

[0014] The biasing unit 14 is configured to bias the pedal unit 20. The biasing unit 14 is configured to bias the pedal unit 20 toward the base unit 11 with respect to the bottom unit 12 in the opposing direction in which the base unit 11 and the bottom unit 12 face each other. The biasing unit 14 is configured to assist plantar flexion. The biasing unit 14 is configured to bias the pedal unit 20 in the dorsiflexion direction.

[0015] 2 and 3, the biasing unit 14 includes a torsion spring 14a and a shaft 14b. The torsion spring 14a is configured to twist in response to rotation of the pedal unit 20. The shaft 14b is configured to support the torsion spring 14a.

[0016] The torsion spring 14a includes a wound portion 14a1 and an extending portion 14a2. The extending portion 14a2 is configured to extend radially outward from the wound portion 14a1. The shaft 14b is inserted through the torsion spring 14a. The torsion spring 14a is configured such that the extending portion 14a2 biases the pedal portion 20 when the shaft 14b is inserted through the wound portion 14a1 of the torsion spring 14a. The torsion spring 14a is configured to twist in the circumferential direction of the shaft 14b. In this embodiment, the shaft 14b is fixed to the side portion 13. Specifically, both ends of the shaft 14b are fixed to each of the pair of side portions 13.

[0017] 3 and 4, shaft 14b is disposed between rotation axis 15b and bottom portion 12 in the opposing direction in which base portion 11 and bottom portion 12 face each other. When ankle joint plantar flexion and dorsiflexion training device 100 is placed on the floor, shaft 14b is disposed below rotation axis 15b.

[0018] In this embodiment, torsion spring 14a is a double torsion spring. Winding portion 14a1 includes first winding portion 14a11 and second winding portion 14a12. Second winding portion 14a12 is arranged alongside first winding portion 14a11 in the axial direction of shaft 14b.

[0019] The extending portion 14a2 includes a first extending portion 14a21 and a second extending portion 14a22. The first extending portion 14a21 is connected to the first winding portion 14a11. The second extending portion 14a22 is connected to the second winding portion 14a12.

[0020] Torsion spring 14a includes connecting portion 14a3. Connecting portion 14a3 is configured to connect first wound portion 14a11 and second wound portion 14a12. First extending portion 14a21 is disposed on the opposite side of first wound portion 14a11 from connecting portion 14a3 in the axial direction. Second extending portion 14a22 is disposed on the opposite side of second wound portion 14a12 from connecting portion 14a3 in the axial direction.

[0021] As shown in FIGS. 3 and 5, the biasing unit 14 includes a support portion 14c. The support portion 14c is configured to support the connecting portion 14a3. The support portion 14c has a male threaded portion 14c1, a female threaded portion 14c2, and a base 14c3. The female threaded portion 14c2 is configured to screw into the male threaded portion 14c1. The biasing unit 14 is configured so that the biasing force of the torsion spring 14a can be changed by moving the female threaded portion 14c2 relative to the male threaded portion 14c1 supported by the base 14c3 while the female threaded portion 14c2 is in contact with the connecting portion 14a3. In this embodiment, the base 14c3 is fixed to the bottom 12.

[0022] As shown in Fig. 4, the rotation support portion 15 is configured to rotatably support the pedal portion 20. The rotation support portion 15 includes a bearing portion 15a and a rotation shaft 15b. The rotation shaft 15b is rotatably supported by the bearing portion 15a. In this embodiment, the side portion 13 includes the bearing portion 15a.

[0023] 4 and 5, the pedal unit 20 is configured to allow the user's heel to rest on it. The pedal unit 20 includes a front surface 20a and a rear surface 20b. The front surface 20a may have an anti-slip function.

[0024] The pedal section 20 includes a base end section 21, a central section 22, and a tip end section 23. The base end section 21 is disposed at the base end of the pedal section 20. The base end section 21 is supported by the rotation shaft 15b. The rotation shaft 15b is inserted into the base end section 21. The central section 22 is connected to the base end section 21. The central section 22 is disposed between the base end section 21 and the tip end section 23. The tip end section 23 is disposed on the opposite side of the central section 22 from the base end section 21. The tip end section 23 is disposed at the tip of the pedal section 20.

[0025] The pedal unit 20 is configured so that, when rotated about the rotation axis 15b, the tip end 23 is positioned closer to the bottom end 12 than the base unit 11 in the opposing direction in which the base unit 11 and the bottom unit 12 face each other. The pedal unit 20 is configured so that, when the user's heel is not placed on it, the pedal unit 20 is biased by the biasing unit 14, increasing the distance from the bottom unit 12 from the base end 21 toward the tip end 23. The pedal unit 20 is configured so that, when the user's heel is placed on it and the heel is lowered, the distance from the bottom unit 12 from the base end 21 toward the tip end 23 decreases. The rotation angle of the pedal unit 20 is, for example, 55° or more upward and 30° or less downward.

[0026] The pedal section 20 includes a contact section 24. The contact section 24 is configured to come into contact with the extension section 14a2 of the torsion spring 14a. The contact section 24 is attached to the rear surface 20b. The contact section 24 is disposed in the central section 22 of the pedal section 20. The contact section 24 is configured so that the distance from the rear surface 20b increases from the base end section 21 toward the tip end section 23. In other words, the contact section 24 is inclined.

[0027] The pedal section 20 is not separated so that it can be moved separately for the left and right feet, but is configured so that both feet are plantar flexed simultaneously to raise the heels.

[0028] The operation of the ankle joint plantar flexion and dorsiflexion training device 100 according to the embodiment will be described with reference to FIGS.

[0029] In the ankle joint plantar flexion and dorsiflexion training device 100 according to the embodiment, when a user places their toes on the base unit 11 and their heels on the pedal unit 20, and then lowers their heels, the pedal unit 20 rotates. The pedal unit 20 rotates about the rotation axis 15b in the direction in which the base unit 11 and the bottom unit 12 face each other, so that the tip end 23 is positioned closer to the bottom unit 12 than the base unit 11. In other words, the pedal unit 20 rotates about the rotation axis 15b so that the tip end 23 is positioned lower than the base unit 11. This allows the heel to be lowered to a sufficient dorsiflexion angle. This enables exercise (plantar and dorsiflexion exercise) over a wide range of motion.

[0030] Furthermore, the biasing unit 14 biases the pedal unit 20 toward the base unit 11 relative to the bottom unit 12 in the opposing direction in which the base unit 11 and the bottom unit 12 face each other. In other words, the biasing unit 14 biases the pedal unit 20 upward. This assists heel lifting, making it possible to lift the heel easily and quickly. This reduces the exercise load, making it possible to perform plantar flexion at high speed.

[0031] Next, the effects of the ankle joint plantar flexion and dorsiflexion training device 100 according to this embodiment will be described.

[0032] According to the ankle joint plantar flexion and dorsiflexion training device 100 of this embodiment, the pedal unit 20 is configured to position the tip end 23 toward the base unit 12 relative to the base unit 11 in the opposing direction in which the base unit 11 and the bottom unit 12 face each other when rotated around the rotation axis 15b. This allows the heel to be lowered to a sufficient dorsiflexion angle. This allows for a larger dorsiflexion range of motion. This allows for exercise over a wider range of motion. Furthermore, the biasing unit 14 is configured to bias the pedal unit 20 toward the base unit 11 relative to the bottom unit 12 in the opposing direction in which the base unit 11 and the bottom unit 12 face each other. This allows for easy and quick heel lifting by assisting heel lift from below. This reduces the exercise load, allowing for high-speed plantar flexion exercise.

[0033] In the ankle joint plantar flexion and dorsiflexion training device 100 according to this embodiment, the torsion spring 14a is configured so that the extension 14a2 biases the pedal unit 20 when the shaft 14b is inserted through the winding 14a1 of the torsion spring 14a. When a cylindrical compression spring is placed below the pedal unit 20, as in Patent Document 1, the windings of the cylindrical compression spring overlap each other, preventing a large stroke. Furthermore, a conical compression spring can prevent the windings from overlapping each other, but the assisting force is insufficient. In contrast, in the ankle joint plantar flexion and dorsiflexion training device 100 according to this embodiment, the torsion spring 14a provides a sufficient stroke and sufficient assisting force.

[0034] In ankle plantar flexion training device 100 according to this embodiment, shaft 14b is disposed between rotating shaft 15b and bottom portion 12 in the opposing direction in which base portion 11 and bottom portion 12 face each other. This allows torsion spring 14a to constantly generate torque toward base portion 11. Note that in order to efficiently transmit the torque of torsion spring 14a and smoothly rotate pedal portion 20, the distance between shaft 14b and rotating shaft 15b is preferably slightly larger than the outer diameter of the coil of torsion spring 14a.

[0035] In the ankle plantar flexion training device 100 according to this embodiment, the first extension portion 14a21 is disposed on the axial side of the first winding portion 14a11 opposite the connecting portion 14a3. The second extension portion 14a22 is disposed on the axial side of the second winding portion 14a12 opposite the connecting portion 14a3. Therefore, the first extension portion 14a21 and the second extension portion 14a22 can bias the pedal unit 20 in a well-balanced manner in the axial direction. Furthermore, because the axis 14b of the torsion spring 14a and the rotation axis 15b of the pedal unit 20 are misaligned, if the extension portion 14a2 of the torsion spring 14a and the contact portion 24 of the pedal unit 20 were fixed, the pedal unit 20 would not rotate smoothly. Therefore, the extension portion 14a2 of the torsion spring 14a and the contact portion 24 of the pedal unit 20 are not fixed to each other.

[0036] In the ankle plantar flexion training device 100 according to this embodiment, the biasing portion 14 is configured so that the biasing force of the torsion spring 14a can be changed by moving the female threaded portion 14c2 relative to the male threaded portion 14c1 supported by the base 14c3 while the female threaded portion 14c2 is in contact with the connecting portion 14a3. This makes it possible to adjust the biasing force of the torsion spring 14a.

[0037] According to the ankle joint plantar flexion and dorsiflexion training device 100 of this embodiment, the contact portion 24 of the pedal portion 20 is configured so that the distance from the back surface 20b increases from the base end 21 to the tip end 23. This makes it possible to suppress interference between the pedal portion 20 and the extension portion 14a2 of the torsion spring 14a.

[0038] According to the ankle plantar flexion and dorsiflexion training device 100 of this embodiment, the pedal unit 20 is not separated so that it moves separately for the left and right feet, but is configured to plantar flex both feet simultaneously to lift the heels. If the pedal unit 20 were configured to lift the heels of each foot independently, most of the weight would be placed on the foot that is not lifting the heel, and almost none would be placed on the foot that is lifting the heel, resulting in a reduced training effect. However, because the pedal unit 20 is configured as a single plate so that the heels of both feet are lifted simultaneously, the training effect is enhanced.

[0039] Next, a first modification of the ankle joint plantar flexion and dorsiflexion training device 100 according to the embodiment will be described with reference to Fig. 6. Fig. 6 shows the state in which the pedal part 20 is rotating.

[0040] In a first modification of the ankle plantar flexion and dorsiflexion training device 100 according to the embodiment, the biasing unit 14 includes a cylinder portion 14d. The cylinder portion 14d is configured to support the connecting portion 14a3. The cylinder portion 14d is configured to bias the connecting portion 14a3. The biasing unit 14 is configured so that the biasing force of the torsion spring 14a can be changed by the cylinder portion 14d biasing the connecting portion 14a3.

[0041] The cylinder portion 14d includes a housing 14d1 and a compression spring 14d2. The compression spring 14d2 is disposed within the housing 14d1. The compression spring 14d2 is configured to bias an end of the torsion spring 14a. The cylinder portion 14d includes an adjustment mechanism 14d3. The adjustment mechanism 14d3 is configured to adjust the repulsive force of the compression spring 14d2. The adjustment mechanism 14d3 may include, for example, a bolt and be configured to compress the compression spring 14d2 by tightening the bolt.

[0042] The cylinder portion 14d is attached to the fixed portion 14e via a fixed shaft 14f. The cylinder portion 14d is configured to be rotatable around the fixed shaft 14f. In this embodiment, the fixed portion 14e is fixed to the base portion 11.

[0043] In the first modification of the ankle plantar flexion and dorsiflexion training device 100 according to the embodiment, when the user places their toes on the base 11 and their heels on the pedal 20, the pedal 20 rotates as the user lowers their heels. When the pedal 20 drops below horizontal, a force is generated that rotates the torsion spring 14a. As the torsion spring 14a rotates, the end of the torsion spring 14a moves in a direction that presses against the compression spring 14d2 of the cylinder 14d. This relieves the upward torque of the torsion spring 14a, thereby reducing the force required to lower the pedal 20.

[0044] According to the first modification of the ankle plantar flexion training device 100 of this embodiment, the biasing unit 14 is configured so that the biasing force of the torsion spring 14a can be changed by the cylinder portion 14d biasing the connecting portion 14a3. This reduces the upward torque of the torsion spring 14a, thereby reducing the force required to lower the pedal unit 20. Furthermore, the repulsive force of the compression spring 14d2 can suppress sudden rotation of the torsion spring 14a. Furthermore, the repulsive force of the compression spring 14d2 can exert an assisting force when the torsion spring 14a rotates upward. Furthermore, the repulsive force of the compression spring 14d2 can be adjusted using the adjustment mechanism 14d3.

[0045] Next, a second modification of the ankle joint plantar flexion and dorsiflexion training device 100 according to the embodiment will be described with reference to FIGS.

[0046] In the second modification of the ankle joint plantar flexion and dorsiflexion training device 100 according to the embodiment, the contact portion 24 is configured in a columnar or cylindrical shape. The contact portion 24 is disposed so that the extension portion 14a2 of the torsion spring 14a intersects with the axial direction of the contact portion 24. The contact portion 24 is attached to the back surface 20b by an attachment member.

[0047] According to the second modification of the ankle plantar flexion and dorsiflexion training device 100 of the embodiment, the contact portion 24 is configured in a columnar or cylindrical shape and is arranged so that the axial direction of the extension portion 14a2 of the torsion spring 14a intersects with the contact portion 24. This makes it possible to suppress interference between the pedal portion 20 and the extension portion 14a2 of the torsion spring 14a. Furthermore, this allows for cost reduction compared to the contact portion 24 shown in FIGS. 3 and 4.

[0048] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0049] 10 main body portion, 11 base portion, 12 bottom portion, 13 side portion, 14 biasing portion, 14a torsion spring, 14a1 winding portion, 14a11 first winding portion, 14a12 second winding portion, 14a2 extension portion, 14a21 first extension portion, 14a22 second extension portion, 14a3 connecting portion, 14b shaft, 14c support portion, 14c1 male thread portion, 14c2 female thread portion, 14c3 base, 14d cylinder portion, 14d1 housing, 14d2 compression spring, 14d3 adjustment mechanism, 14e fixed portion, 14f fixed shaft, 15 rotation support portion, 15a bearing portion, 15b rotation shaft, 20 pedal portion, 21 base end portion, 22 central portion, 23 tip portion, 24 Contact area, 100 ankle plantar flexion and dorsiflexion training device.

Claims

1. a main body; a pedal unit connected to the main body unit, the main body portion includes a base portion, a bottom portion facing the base portion, a biasing portion configured to bias the pedal portion, and a rotation support portion configured to rotatably support the pedal portion; the rotation support portion includes a bearing portion and a rotation shaft rotatably supported by the bearing portion, the pedal unit includes a base end supported by the rotation shaft, a central portion connected to the base end, and a tip end located on the opposite side of the central portion from the base end, and the pedal unit is configured such that when the user's heel is not placed on the pedal unit, the distance from the bottom increases from the base end toward the tip end when the pedal unit is biased by the biasing portion; the pedal unit is configured to be rotatable around the rotation shaft so that when the user's heel is placed on the pedal unit and the heel is lowered, the distance from the bottom decreases from the base end toward the tip end; and when rotated around the rotation shaft, the tip end is positioned closer to the bottom than the base unit in the opposing direction in which the base unit and the bottom unit face each other, the biasing portion is configured to bias the pedal portion toward the base portion with respect to the bottom portion in the opposing direction in which the base portion and the bottom portion oppose each other, the biasing portion includes a torsion spring and a shaft configured to support the torsion spring; the torsion spring includes a winding portion and an extension portion configured to extend radially outward from the winding portion, the torsion spring is configured so that the extension portion biases the pedal portion when the shaft is inserted through the wound portion of the torsion spring, the shaft is disposed between the rotation shaft and the bottom in the opposing direction in which the base and the bottom face each other, the pedal portion includes a contact portion, the contact portion is configured to come into contact with the extension portion of the torsion spring and is disposed in the central portion of the pedal portion; An ankle joint plantar flexion and dorsiflexion training device, wherein the extension portion of the torsion spring and the contact portion of the pedal portion are not fixed to each other.

2. the winding portion includes a first winding portion and a second winding portion arranged alongside the first winding portion in the axial direction of the shaft, the extension portion includes a first extension portion connected to the first winding portion and a second extension portion connected to the second winding portion, the torsion spring includes a connecting portion configured to connect the first wound portion and the second wound portion; the first extending portion is disposed on an opposite side of the first winding portion from the connecting portion in the axial direction, The ankle joint plantar flexion and dorsiflexion training device according to claim 1 , wherein the second extending portion is disposed on an opposite side of the second winding portion from the connecting portion in the axial direction.

3. the biasing portion includes a support portion configured to support the connecting portion, The support portion has a male threaded portion, a female threaded portion configured to threadably engage with the male threaded portion, and a base configured to support the male threaded portion, 3. The ankle joint plantar flexion and dorsiflexion training device according to claim 2, wherein the biasing portion is configured to change the biasing force of the torsion spring by moving the female threaded portion relative to the male threaded portion supported by the base while the female threaded portion is in contact with the connecting portion.

4. the biasing portion includes a cylinder portion configured to support the connecting portion; The cylinder portion is configured to bias the connecting portion, 3. The ankle joint plantar flexion and dorsiflexion training device according to claim 2, wherein the biasing portion is configured so that the biasing force of the torsion spring can be changed by the cylinder portion biasing the connecting portion.

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