Exercise-promoting chair

Abstract

To provide an exercise-promoting chair capable of inducing pedaling exercise with less torque (low power, lower specification and inexpensive motor).SOLUTION: A motion-promoting chair 10A includes a chair body 11A, a seating part 12A, and a movable backrest part 14A on which a user 13A seated on the seating part leans back, and the movable backrest part is moved so as to induce a pedaling exercise of a person seated on the seating part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a motion-promoting chair. [Background technology]

[0002] BACKGROUND ART When performing a pedaling exercise, a technique is known in which a user is encouraged to start pedaling (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-157545 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, while moving the seat can encourage pelvic movement, the seat bears most of the weight of the person sitting on it, so a corresponding torque is required to move the seat.

[0005] The present disclosure has been made to solve such problems and provides an exercise-promoting chair that can induce pedaling motion with less torque (low power, lower specification, cheaper motor). [Means for solving the problem]

[0006] The exercise-promoting chair according to the present disclosure comprises a chair body, a seat, and a movable backrest against which a user seated on the seat leans, the movable backrest being movable to induce a pedaling motion in the user seated on the seat. This configuration makes it possible to provide an exercise-promoting chair that can induce a pedaling motion with less torque (low power, a motor with lower specifications and lower cost). [Effects of the Invention]

[0007] The present disclosure makes it possible to provide an exercise-promoting chair that can induce pedaling motion with less torque (low power, lower spec, cheaper motor). [Brief explanation of the drawings]

[0008] [Figure 1] 1A is a side view of a bicycle-type lower limb exercise device 10A according to a first embodiment, and FIG. 1B is a front view thereof. [Figure 2] 10(a) and 10(b) are diagrams showing a state in which the movable backrest portion 14A is rotated about the body axis Z1. [Figure 3] This is an example of the support portion 15A, the mechanism 16A, etc. [Figure 4] 10(a) is a side view of a bicycle-type lower limb exercise device 10B according to a second embodiment, and FIG. [Figure 5] 10(a) and 10(b) are examples of the support portion 15B, the mechanism 16B, etc. [Figure 6] 10(a) is a side view of a bicycle-type lower limb exercise device 10C of a third embodiment, and FIG. 10(b) is a side view of a bicycle-type lower limb exercise device 10D of a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a bicycle-type lower limb exercise device, which is an example of an exercise-promoting chair according to an embodiment, will be described with reference to the accompanying drawings. Corresponding components in each drawing are given the same reference numerals, and duplicated explanations will be omitted.

[0010] The present inventors have investigated inducing a pedaling motion by moving the backrest (the trunk in contact with the backrest), rather than by moving the seat as in Patent Document 1.

[0011] As a result, we found that when moving the trunk from the outside, the results vary greatly depending on the person, depending on the way of moving and the points of movement, and whether or not it stimulates linked lower limb movement.The details of this discovery are explained below.

[0012] In other words, it is known that each person's body movement is unique, and that each unique movement determines which joints are primarily focused on (4stance theory: http: / / www.4stance.com / 4stance05.html). Hiroto, the proponent of the 4stance theory, states, "Human body movements can be classified into four types. Everyone belongs to one of these types, and utilizing the characteristics of that type will lead to the most natural, effective, and maximum performance." He also states that humans are divided into two types: those with a center of gravity on the toes (hereinafter referred to as "Type A") and those with a center of gravity on the heels (hereinafter referred to as "Type B"). He further states that within these types, there are two types: those with a center of gravity on the inside (hereinafter referred to as "Type 1") and those with a center of gravity on the outside (hereinafter referred to as "Type 2"), resulting in four classifications: A1, A2, B1, and B2. Furthermore, there are two types of movement: cross (A1, B2) and parallel (A2, B1) (see Reash Project https: / / www.reash-project.net / aboutreash.html).

[0013] The inventors classified several subjects into types based on the four-stance theory and observed their body movements. As a result, they found the following tendency. That is, when moving the lower limbs by externally moving the lumbar or thoracic vertebrae above the pelvis, some subjects perform well and some do not. There are types (cross) who can synchronize the movement of the trunk to the lower limbs by moving the trunk on the roll axis to the left and right, and types (parallel) who synchronize the movement of the trunk to the lower limbs by moving the trunk on the yaw axis that rotates the trunk back and forth.

[0014] When observing by changing the location and direction of application of an external force, there are Type B individuals who tend to feel a greater external force when applied near the sides of the trunk (the trunk also moves in response to the external force), and Type A individuals who tend to feel a greater external force when applied near the solar plexus rather than the sides. The coordinated movement of the trunk and lower limbs in Type B involves the thoracic vertebrae, lumbar vertebrae, and hip joints being one, and the trunk sways from side to side as if pedaling. Because the thoracic vertebrae, lumbar vertebrae, and hip joints move as one, applying an external force to the trunk along the roll axis or yaw axis creates a coordinated movement of the trunk → pelvis → lower limbs, stimulating lower limb movement. On the other hand, the coordinated movement of the trunk and lower limbs in Type A involves a movement in which the thoracic vertebrae, lumbar vertebrae, and pelvis are inverted around the solar plexus. For example, an external force applied near the armpit in the direction of the roll axis moves the trunk (thoracic vertebrae) in the positive roll axis direction, then the lumbar vertebrae and pelvis in the negative roll axis direction, and then the lower limbs move (see Improving Health Through Sitting Time_ROBOMEC2024.pdf). When the thoracic vertebrae of the trunk are moved from the outside, only the thoracic vertebrae above the solar plexus move primarily (the transmission of force is interrupted at the solar plexus). The lumbar vertebrae and pelvis below the solar plexus do not move much.

[0015] Next, embodiments 1 to 4 completed based on the above findings made by the present inventors will be described.

[0016] <Embodiment 1> First, a description will be given of a bicycle-type lower limb exercise device, which is an example of an exercise-promoting chair according to embodiment 1. Fig. 1(a) is a side view of a bicycle-type lower limb exercise device 10A according to embodiment 1, and Fig. 1(b) is a front view.

[0017] As shown in FIGS. 1(a) and 1(b), a bicycle-type lower limb exercise device 10A of the first embodiment is a lower limb exercise device that stimulates trunk movement through a parallel type-B type. As shown in FIGS. 1(a) and 1(b), a pedaling exercise device 3 is disposed in front of the bicycle-type lower limb exercise device 10A. With the bicycle-type lower limb exercise device 10A of the first embodiment, the movable backrest 14A is movable as described below, thereby inducing a pedaling exercise (a pedaling exercise using the pedaling exercise device 3) in a user 13A seated on the bicycle-type lower limb exercise device 10A (seat 12A). The pedaling exercise device 3 includes a pedal unit 7 and a device body 8. The pedal unit 7 includes a shaft 10 rotatably supported by the device body 8, a pair of cranks (not shown) connected to the shaft 10, and a pair of pedals 12 rotatably attached to each of the pair of cranks. A user 13A seated on a bicycle-type lower limb exercise device 10A (seat 12A) performs pedaling exercise by alternately stepping forward with both feet on a pair of pedals 12. At this time, a load is generated against the rotation of the pedal unit 7 because a speed reduction mechanism (not shown) is connected to the shaft 10 of the pedal exercise device 3.

[0018] The bicycle-type lower limb exercise device 10A includes a chair body 11A, a seat 12A attached to the chair body 11A, and a movable backrest 14A attached to the chair body 11A. For ease of explanation, the X, Y, and Z axes are defined below. The X axis extends in the front-to-back direction of a user 13A seated on the seat 12A. The Z axis extends vertically. The Y axis extends in a direction perpendicular to the XZ plane. Hereinafter, the X axis and Z axis may be referred to as the roll axis and yaw axis, respectively.

[0019] The movable backrest 14A is a portion on which the user 13A seated on the seat 12A rests. The movable backrest 14A is preferably positioned in a tilted state along the body axis Z1 so as to contact (surface-contact) with and support the back surface (back of the shoulder blades) of the user 13A when the body axis Z1 is tilted at an angle θ1 (see FIG. 1(a)) with respect to the Z axis. The body axis Z1 is a straight line connecting the contact point of the user 13A with the movable backrest 14A and the pelvis of the user 13A. The movable backrest 14A (back surface) is preferably tilted at an angle θ1 with respect to the seat 12A (seat surface). The angle θ1 is 100 to 130 degrees. The movable backrest 14A is movable so as to induce a pedaling motion in the user 13A leaning against the movable backrest 14A.

[0020] The inventors have discovered that the foot-pedaling motion of the parallel type-B user 13A can be induced by moving the movable backrest 14A as follows. This point will be explained below. First, as shown in FIG. 2(a), the movable backrest 14A is rotated about the body axis Z1 (yaw axis rotation). FIG. 2(a) shows the movable backrest 14A rotating about the body axis Z1. Note that the period of the yaw axis rotation of the trunk around the Z axis must match the period of the foot-pedaling motion. When performing foot-pedaling once per second, the period of the yaw axis rotation of the trunk also becomes a periodic motion in which the trunk returns to the same position once per second. Note that the range of rotation is approximately 15 to 30 degrees. As a result, when the user 13A moves their right shoulder forward, they also move their left shoulder backward. Also, when the user 13A moves their left shoulder forward, they also move their right shoulder backward. This movement generates a twisting motion of the trunk of the user 13A around the yaw axis. This trunk movement is a linked movement of the trunk when the lower limbs move, and reminds the user 13A of the movement of the lower limbs. In addition to this movement, the movable backrest 14A is rotated about the X1 axis (roll axis rotation) as shown in FIG. 2(b). FIG. 2(b) shows the movable backrest 14A rotating about the body axis Z1. This induces movement of the pelvis around the roll axis when the lower limbs step out, further promoting lower limb movement. Note that the period of the roll axis rotation of the trunk around the X1 axis must match the period of the pedaling motion. If pedaling is performed once per second, the period of the roll axis rotation of the trunk will also be a cyclical movement returning to the same position once per second. Note that the range of rotation is approximately 5 to 10 degrees.

[0021] The body axis Z1 passes through approximately the center of the movable backrest portion 14A in the left-right direction (see Figures 2(a) and 2(b)). On the other hand, the X1 axis passes through approximately the center of the movable backrest portion 14A in the up-down and left-right directions and extends in a direction perpendicular to the body axis Z1 (see Figures 2(a) and 2(b)). The inventors have confirmed that, at a minimum, by rotating the movable backrest portion 14A about the body axis Z1, it is possible to induce a pedaling motion in the parallel type-B user 13A.

[0022] A mechanism 17A that realizes the above-described movement of the movable backrest 14A (movement that can induce the pedaling motion of the user 13A) is provided between the chair body 11A and the movable backrest 14A. For example, the mechanism described in JP 2020-039797 A (see FIG. 3) may be used as this mechanism 17A. According to the mechanism described in JP 2020-039797 A, the movable backrest 14A generates a compound twisting motion (a complex figure-eight motion), thereby generating a torsional motion in the yaw axis direction of the trunk of the user 13A. Specifically, when the front end of the movable backrest 14A swings to the right and its upper surface simultaneously tilts downward to the left, the rear end swings to the left and its upper surface tilts upward to the right. Conversely, when the front end of the movable backrest 14A swings to the left and its upper surface simultaneously tilts downward to the right, the rear end swings to the right and its upper surface tilts upward to the left. By repeating this movement, the movable backrest portion 14A generates a complex twisting motion (a complex figure-eight motion), which generates a twisting motion in the yaw axis direction of the trunk of the user 13A, thereby inducing a pedaling motion in the user 13A.

[0023] The mechanism 17A is not limited to the mechanism described in JP 2020-039797 A, but may be any known mechanism, such as the Pelvic Twister pstw1206, the mechanism used in STYLISH JAPAN, or the mechanism used in the YA-MAN Twistride AYS41B.

[0024] As shown in FIG. 3, the movable backrest 14A may include a pair of left and right support members 15A that support the trunk of the user 13A seated on the seat 12A, and a mechanism 16A (a mechanism combining a pinion and a rack) that drives the pair of left and right support members 15A to hold down and support the shoulders or sides of the user 13A seated on the seat 12A. In this case, the support members 15A preferably support the upper trunk (above the solar plexus) and pelvis of the user 13A seated on the seat 12A so that they can move together. It is also preferable that the solar plexus of the user 13A seated on the seat 12A can move freely without restricting its movement. FIG. 3 shows an example of the support members 15A and the mechanism 16A. The configuration of the first embodiment is not limited to bicycle-type lower limb exercise equipment, but may also be applied to, for example, knee bending and straightening exercise equipment and forward / backward sliding lower limb exercise equipment.

[0025] As described above, according to the first embodiment, it is possible to provide a bicycle-type lower limb exercise device 10A that can induce pedaling exercise with less torque (low power, lower spec, less expensive motor) compared to when the seat is moved. This is because the movable backrest 14A, which bears a relatively small amount of the weight of the seated user, is movable, rather than the seat, which bears most of the weight of the seated user.

[0026] The operation of the present disclosure is as follows. Specifically, there are moving points and stopping points as joints, depending on the individual way the body moves. The inventors discovered that the stopping point is the point where force is exerted (i.e., the point where external force is applied), and once the stopping point is determined, the moving point is determined. When the body moves in unison, the role of the joint is determined in the following order: stopping point → moving point → stopping point. They also found that the roles of these joints tend to be reversed between Type A and Type B. When the stopping point is moved from the outside, it becomes a point that can easily move (guide) the user from the outside in response to the external force. On the other hand, when the moving point is moved from the outside, the force escapes, making it difficult to move (guide) the user. When the movement of the moving point of the trunk is constrained, it moves as a unit with the stopping point. In the type that moves the trunk on the yaw axis, the moving point (solar plexus) is restrained by left and right support members, so that when force is applied to the trunk from the outside, it moves as a unit with the trunk. This prevents force from escaping from the solar plexus and allows the force to be transmitted. When applying an external force to the back of a chair to move it, Type A has support members that hold down both sides of the chair so that the thoracic vertebrae, lumbar vertebrae, and pelvis are integrated and transmit the movement of the body around the solar plexus, which is the stopping point, and these support members have the function of maintaining contact from the sides to the pelvis. Because the backrest moves as a unit with the thoracic vertebrae, lumbar vertebrae, and pelvis, the movement of the backrest is easily transmitted as pelvic movement. It also makes it easier to convert trunk movement into lower limb movement. Depending on how the body moves, the cross type applies an external force in the roll axis direction, while the parallel type applies an external force in the yaw axis direction, making it easier to generate linked trunk-to-lower limb movement.

[0027] <Embodiment 2> Next, a description will be given of a bicycle-type lower limb exercise device, which is an example of an exercise-promoting chair according to embodiment 2. Fig. 4(a) is a side view of a bicycle-type lower limb exercise device 10B according to embodiment 2, and Fig. 4(b) is a front view.

[0028] As shown in Figures 4(a) and 4(b), the bicycle-type lower limb exercise device 10B of the second embodiment is a cross-type-B type lower limb exercise device that promotes trunk coordination. As shown in Figures 4(a) and 4(b), a pedaling exercise device 3 is disposed in front of the bicycle-type lower limb exercise device 10A, as in the first embodiment. The pedaling exercise device 3 has already been described, so its description will be omitted.

[0029] The bicycle-type leg exercise device 10B includes a chair body 11B, a seating portion 12B attached to the chair body 11B, and a movable backrest portion 14B attached to the chair body 11B.

[0030] The movable backrest 14B is a portion on which the user 13B seated on the seating portion 12B rests. The movable backrest 14B is preferably positioned in a tilted state along the body axis Z2 so as to contact (surface-contact) with and support the back surface (back surface of the shoulder blades) of the user 13B when the body axis Z2 is tilted at an angle θ2 (see FIG. 4(a)) with respect to the Z axis. The body axis Z2 is a straight line connecting the contact point of the user 13B with the movable backrest 14B and the pelvis of the user 13B. The movable backrest 14B (back surface) is preferably tilted at an angle θ2 with respect to the seating portion 12B (seat surface). The angle θ2 is 100 to 130 degrees. The movable backrest 14B is movable so as to induce a pedaling motion in the user 13B leaning against the movable backrest 14B.

[0031] The inventors discovered that the cross-type B user 13B can be induced to pedal by moving the movable backrest 14B as follows. Specifically, the movable backrest 14B is slid back and forth in the Y-axis direction to induce pedaling in the user 13B leaning on the movable backrest 14B. As the movable backrest 14B is slid back and forth in the Y-axis direction, the trunk of the user 13B leaning on the movable backrest 14B also slid back and forth in the Y-axis direction. This shifts the body weight to the ischial bone on the pedaling side, inducing pedaling. The period of the trunk's reciprocating sliding must match the period of the pedaling motion. When pedaling is performed once per second, the trunk's period of reciprocating sliding also becomes a periodic movement, returning to the same position once per second. The amount of reciprocating sliding is at least approximately ±60 mm.

[0032] A mechanism (not shown) that realizes the above-described movement of the movable backrest 14B (movement that can induce the pedaling motion of the user 13B) is provided between the chair body 11B and the movable backrest 14B. Although not shown, this mechanism may be a known reciprocating slide mechanism. As shown in FIGS. 5(a) and 5(b), the movable backrest 14B may also include a pair of left and right support members 15B that support the trunk of the user 13B seated on the seat 12B, and a mechanism 16B that drives the pair of left and right support members 15B to hold down and support the shoulders or sides of the user 13B seated on the seat 12B. In this case, it is desirable for the support members 15B to support the upper trunk (above the solar plexus) and pelvis of the user 13B seated on the seat 12B so that they can move together. It is also desirable that the solar plexus of user 13B seated on seat 12B be able to move freely without restricting movement in the surrounding area. Figures 5(a) and 5(b) show examples of support unit 15B, mechanism 16B, etc. The configuration of embodiment 2 is not limited to bicycle-type lower limb exercise equipment, and may also be applied to, for example, knee bending and straightening exercise equipment and forward / backward sliding lower limb exercise equipment.

[0033] As described above, according to the second embodiment, it is possible to provide a bicycle-type lower limb exercise device 10B that can induce pedaling exercise with less torque (low power, lower spec, less expensive motor) compared to when the seat is moved. This is because the movable backrest 14B, on which a relatively small amount of weight of the seated user 13B is applied, is movable, rather than the seat, on which most of the weight of the user is applied.

[0034] <Embodiment 3> Next, a description will be given of a bicycle-type lower limb exercise device, which is an example of an exercise-promoting chair according to embodiment 3. Fig. 6(a) is a side view of a bicycle-type lower limb exercise device 10C according to embodiment 3.

[0035] As shown in Fig. 6(a), the bicycle-type lower limb exercise device 10C of the third embodiment is a parallel type-A type lower limb exercise device that encourages trunk coordination. As shown in Fig. 6(a), a pedaling exercise device 3 is disposed in front of the bicycle-type lower limb exercise device 10C, as in the first embodiment. The pedaling exercise device 3 has already been described, so its description will be omitted.

[0036] The bicycle-type leg exercise device 10C includes a chair body 11C, a seat 12C attached to the chair body 11C, and a movable backrest 14C attached to the chair body 11C.

[0037] The movable backrest 14C is a portion on which the user 13C seated on the seat 12C leans back. The movable backrest 14C is preferably positioned along an axis AX1 parallel to the Z axis so as to make contact (surface contact) with the rear of the solar plexus of the user 13C when the body axis Z3 is tilted at an angle θ3 (see FIG. 6(a)) with respect to the Z axis, and to support the rear of the solar plexus (see FIG. 6(a)). The movable backrest 14C (backrest surface) is, for example, arranged perpendicular to the seat 12C (seat surface).

[0038] The inventors discovered that by moving the movable backrest 14C in the same manner as the movable backrest 14A of the first embodiment, it is possible to induce a foot-pedaling motion in the parallel type-A user 13C. This point will be explained below. First, the movable backrest 14C is rotated about an axis AX1 parallel to the Z axis (yaw axis rotation). The period of this rotation must match the period of the foot-pedaling motion. When performing foot-pedaling motion once per second, the period of this rotation also becomes a periodic movement in which the user returns to the same position once per second. The range of rotation is approximately 15 to 30 degrees. As a result, when the user 13C moves their right shoulder forward, they also move their left shoulder backward. Similarly, when the user 13C moves their left shoulder forward, they also move their right shoulder backward. This movement generates a torsional motion around the yaw axis of the trunk of the user 13C. This trunk movement is a synchronized movement of the trunk when the lower limbs move, reminding the user 13C of the movement of the lower limbs. In addition to this movement, the movable backrest portion 14C is rotated about an axis AX2 parallel to the X-axis (roll axis rotation). This induces the pelvis to move about the roll axis when the lower limbs step out, further encouraging the movement of the lower limbs. The period of this roll axis rotation must match the period of the pedaling movement. If pedaling is performed once per second, the period of this rotation will also be a cyclical movement that returns to the same position once per second. The range of rotation is approximately 5 to 10 degrees.

[0039] The axis AX1 passes through approximately the center of the movable backrest portion 14C in the left-right direction (see FIGS. 2(a) and 2(b)). On the other hand, the axis AX2 passes through approximately the center of the movable backrest portion 14C in the up-down and left-right directions and extends in a direction perpendicular to the axis AX1 (see FIGS. 2(a) and 2(b)). The inventors have confirmed that, at a minimum, by rotating the movable backrest portion 14C about the axis AX1 parallel to the Z axis, it is possible to induce a pedaling motion in the parallel type-A user 13C.

[0040] A mechanism 17C that realizes the above-described movement of the movable backrest 14C (movement that can induce pedaling in the user 13C) is provided between the chair body 11C and the movable backrest 14C. This mechanism 17C may be the same as that described in the first embodiment. Although not shown, the movable backrest 14C may also include a pair of left and right support sections that support the trunk of the user 13C seated on the seat 12C, similar to the movable backrest 14A (see FIG. 2) of the first embodiment, and a mechanism (a mechanism combining a pinion and a rack) that drives the pair of left and right support sections to press down on the concentric shape of the solar plexus of the user 13C seated on the seat 12C from the left and right to hold the trunk. The configuration of the third embodiment is not limited to bicycle-type lower limb exercise equipment, and may also be applied to, for example, knee bending and straightening exercise equipment and forward / backward sliding lower limb exercise equipment.

[0041] As described above, according to the third embodiment, it is possible to provide a bicycle-type lower limb exercise device 10C that can induce pedaling with less torque (low power, lower spec, less expensive motor) than when the seat is moved. This is because the movable backrest 14C, which bears a relatively small amount of the weight of the seated user, is movable, rather than the seat, which bears most of the weight of the seated user.

[0042] <Embodiment 4> Next, a description will be given of a bicycle-type lower limb exercise device, which is an example of the exercise-promoting chair of embodiment 4. Fig. 6(b) is a side view of a bicycle-type lower limb exercise device 10D of embodiment 4.

[0043] As shown in Fig. 6(b), the bicycle-type lower limb exercise device 10D of the fourth embodiment is a cross-type-A type lower limb exercise device that promotes trunk coordination. As shown in Fig. 6(b), a pedaling exercise device 3 is disposed in front of the bicycle-type lower limb exercise device 10D, as in the first embodiment. The pedaling exercise device 3 has already been described, so its description will be omitted.

[0044] The bicycle-type leg exercise device 10D includes a chair body 11D, a seat portion 12D attached to the chair body 11D, and a movable backrest portion 14D attached to the chair body 11D.

[0045] The movable backrest 14D is a portion on which the user 13D seated on the seat 12D leans back. The movable backrest 14D is preferably positioned along an axis AX1 parallel to the Z axis so as to make contact (surface contact) with the rear of the solar plexus of the user 13D when the body axis Z4 is tilted at an angle θ4 (see FIG. 6(b)) with respect to the Z axis, and to support the rear of the solar plexus (see FIG. 6(b)). The movable backrest 14D (backrest surface) is, for example, arranged perpendicular to the seat 12D (seat surface).

[0046] The inventors discovered that by moving the movable backrest 14D in the same manner as the movable backrest 14B of the second embodiment, i.e., by sliding the movable backrest 14D back and forth in the Y-axis direction, it is possible to induce a pedaling motion in the cross-type A user 13D. When the movable backrest 14D is slid back and forth in the Y-axis direction, the trunk of the user 13D leaning against the movable backrest 14D also slides back and forth in the Y-axis direction. This shifts the weight of the user 13D to the ischial bone on the pedaling side, inducing a pedaling motion. The period of the trunk's reciprocating sliding must match the period of the pedaling motion. When pedaling once per second, the trunk's period of reciprocating sliding also becomes a periodic movement returning to the same position once per second. The amount of reciprocating sliding is at least approximately ±60 mm.

[0047] A mechanism 17D that realizes the above-described movement of the movable backrest 14D (movement that can induce pedaling by the user 13D) is provided between the chair body 11D and the movable backrest 14D. This mechanism 17D may be the same as that described in the second embodiment. Although not shown, the movable backrest 14D may also include a pair of left and right support sections that support the trunk of the user 13D seated on the seat 12D, similar to the movable backrest 14B of the third embodiment, and a mechanism (a mechanism combining a pinion and a rack) that drives the pair of left and right support sections to press down on the concentric shape of the solar plexus of the user 13D seated on the seat 12D from the left and right to hold the trunk. The configuration of the fourth embodiment is not limited to bicycle-type lower limb exercise equipment, and may also be applied to, for example, knee bending and straightening exercise equipment and forward / backward sliding lower limb exercise equipment.

[0048] As described above, according to the fourth embodiment, it is possible to provide a bicycle-type lower limb exercise device 10D that can induce pedaling with less torque (low power, lower spec, less expensive motor) compared to when the seat is moved. This is because the movable backrest 14D, which bears a relatively small amount of the weight of the seated user, is movable, rather than the seat, which bears most of the user's weight.

[0049] Next, a modified example will be described. In the above-described embodiments, examples using the fixed seating portion 12A etc. have been described, but this is not limiting. For example, the movable seating portion described in Patent Document 1 above may also be used.

[0050] All numerical values ​​shown in the above embodiments are merely examples, and it goes without saying that other appropriate numerical values ​​can be used. The above embodiments are merely examples in every respect. The present invention should not be construed as being limited by the description of the above embodiments. The present invention can be embodied in various other forms without departing from its spirit or main features. [Explanation of symbols]

[0051] 10A, 10B, 10C, 10D... Exercise promotion chair, 11A, 11B, 11C, 11D... Chair body, 12A, 12B, 12C, 12D... Seating portion, 13A, 13B, 13C, 13D... User, 14A, 14B, 14C, 14D... Movable backrest portion, 15A, 15B, 15C, 15D... Support portion, 16A, 16B, 16C, 16D... Mechanism

Claims

1. The chair body and A seating portion; a movable backrest portion on which a user seated on the seating portion rests, The movable backrest portion is movable so as to induce a pedaling movement in a user seated on the seat portion.

2. 2. The exercise promoting chair according to claim 1, wherein the movable backrest portion is moved so that the trunk of a user seated on the seat portion and leaning against the movable backrest portion rotates about a yaw axis.

3. When the front-to-back direction of the user seated on the seating section is the X axis, the vertical direction is the Z axis, and the axis perpendicular to the X-Z plane is the Y axis, The exercise-promoting chair according to claim 1, wherein the movable backrest portion is slidably moved back and forth in the Y-axis direction so as to induce a pedaling motion in a user seated on the seat portion.

4. 2. The exercise promoting chair according to claim 1, wherein the movable backrest portion is positioned so that when a user sitting on the seat portion leans back, the back of the user's shoulder blades comes into contact with the movable backrest portion.

5. 2. The exercise promoting chair according to claim 1, wherein the movable backrest portion is positioned so that when a user sitting on the seating portion leans back, the movable backrest portion comes into contact with the back of the user's solar plexus.

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