WO2008047504A1

WO2008047504A1 - Balance exercising apparatus

Info

Publication number: WO2008047504A1
Application number: PCT/JP2007/064600
Authority: WO
Inventors: Zheng Feng; Koichi Numata
Original assignee: Daito Electric Machine Industry Company Limited
Priority date: 2006-10-18
Filing date: 2007-07-25
Publication date: 2008-04-24
Also published as: JP2008099816A; CN101164640A

Abstract

A balance exercising apparatus capable, despite its simple mechanism, of providing complicated balance exercises to a user who sits or stands on a riding part. The balance exercising apparatus has an installation part (2) installed on a floor surface (F), a riding part (3) which is installed above the installation part (2) and on which a user(M) can ride, an undulation and rocking mechanism (11) installed between the installation part (2) and the riding part (3) and providing undulation motion in the left-right direction to the riding part (3), a back and forth rocking mechanism (12) installed between the installation part (2) and the riding part (3) and rocking the riding part (3) back and forth, and a drive mechanism (13) for simultaneously driving the undulation and rocking mechanism (11) and the back and forth rocking mechanism (12).

Description

Specification

Knock lance exerciser

Technical field

[0001] The present invention relates to a balance exercise device that imparts a balance exercise to a user sitting or standing on a boarding section.

Background art

[0002] Conventionally, Patent Document 1 discloses a sitting-type balance exercise device that swings a seat (carrying part) while a user is seated on the seat and imparts a balance movement to the user. There is.

This device supports a pedestal fixed to the lower surface of a seat so that it can swing back and forth on a movable frame via a pair of left and right connecting links, and supports this movable frame on a base so that it can swing left and right. By driving the connecting link, the seat is configured to rotate and swing around the left and right axis, that is, in the front-rear direction, and to rotate and swing around the front and rear axis, that is, in the left and right direction. Patent Document 1: Japanese Patent Application Laid-Open No. 2004-344684

Disclosure of the invention

Problems to be solved by the invention

[0003] The balance exercise device disclosed in Patent Document 1 has a pair of left and right connection links, and the seat is supported by the movable frame via the connection links so as to be able to swing back and forth, and further based on the movable frame. The structure is supported so as to be able to swing left and right. Therefore, the force and balance training device has a very complicated structure, and it is inevitably costly. Nonetheless, the balance exercise given to the user is a combination of forward and backward swing and left and right swing, which is relatively simple and can be continued for a long time without the user getting bored. The current situation is that it can be realized.

[0004] Therefore, the present invention aims to provide a balance exercise device that can provide a complex balance exercise to a user who is sitting or standing on a riding section with a simple mechanism. Means In order to achieve the above object, the present invention has taken the following technical means!

That is, the balance exercise apparatus according to the present invention includes an installation unit installed on the floor and a boarding unit provided above the installation unit and on which a user can board. Between the installation part and the boarding part, a left-right reciprocal swing is generated with respect to the boarding part, and when the front part of the boarding part is swung leftward, the upper surface of the boarding part is lowered to the left or right. An undulation rocking mechanism that imparts a swell motion such that when the front part of the riding section is swung to the right and the upper surface of the riding section is lowered to the right or raised to the right, the riding section is swung back and forth. And a drive mechanism for simultaneously driving the swell swing mechanism and the forward / backward swing mechanism.

[0006] This makes it possible to give a complex balance movement, which is a combination of undulation and back-and-forth movement, such as a wave swell, to a user who is sitting or standing on the riding section by a simple mechanism. .

Preferably, a waviness swinging mechanism is provided below the riding section, a front / rear swinging mechanism is provided below the wandering swinging mechanism, and the drive mechanism is disposed laterally to the waviness swinging mechanism and the front / rear swinging mechanism. If it is deployed, it should be configured.

By adopting the force and the structure, the balance exercise device according to the present invention can be made very compact.

[0007] More preferably, the swell oscillating mechanism is fixed to a first rotating shaft that is installed so as to face in the left-right direction and is driven to rotate by the driving mechanism, and an intermediate portion in the axial center direction of the first rotating shaft. A cylindrical cam surface that is inclined with respect to the first rotation axis, a first boss portion that is slidably fitted into the cylindrical cam surface, and a lower portion of the first boss portion. It is preferable that the board portion has an anti-sway mechanism that restricts the boss portion from being rotated along with the first rotation shaft, and the riding portion is provided above the first boss portion.

The cylindrical cam surface is formed on the outer peripheral portion of the first cam member fixed to the middle portion of the first rotation shaft in the axial direction.

[0008] The front / rear swing mechanism is a second rotary shaft that is installed so as to face in the left-right direction and is driven to rotate by the drive mechanism, and a clutch that converts the rotational motion of the second rotary shaft into a back-and-forth reciprocating motion. Change the reciprocating motion of the rank mechanism and the crank mechanism to the reciprocating rotational motion of the first boss. It is preferable to have a structure having a conversion mechanism for conversion.

The crank mechanism is fixed to a midway portion in the axial direction of the second rotation shaft disposed at a position lower than the first rotation shaft, and is provided with a second force that is eccentric with respect to the second rotation shaft. A second boss portion that is slidably fitted on the outer periphery of the second cam member, and a crankshaft that is connected to the second boss portion and extends in the front-rear direction. A universal joint for connecting the front end of the crank shaft and the lower end of the first boss may be provided.

[0009] The steady rest mechanism includes the crankshaft, a universal joint portion that connects a front end portion of the crankshaft and a lower end portion of the first boss portion, and a rear end of the crankshaft with respect to the second boss portion. It is preferable to have a structure that includes a pivot part that pivots so that the part can swing in the left-right direction and does not move in the front-rear direction.

The universal joint portion may include a ball portion projecting from a lower portion of the first boss portion, and a ball receiving portion formed at a front end portion of the crankshaft and into which the ball portion is slidably fitted. . The invention's effect

[0010] The sitting type balance exercise device according to the present invention is a simple mechanism, but can give a complicated balance exercise to a user sitting or standing on the riding section, and the user is effective. Balance exercise can be performed.

Brief Description of Drawings

FIG. 1 is an overall perspective view of a balance exercise device (sitting type).

FIG. 2 is a front perspective view of the inside of the balance exercise device.

FIG. 3 is a left rear perspective view of the inside of the balance exercise device.

FIG. 4 is a right rear perspective view of the balance exercise device.

FIG. 5 is a front view of the inside of the balance exercise device.

[FIG. 6] FIG. 6 is a cross-sectional view of a swell rocking mechanism.

FIG. 7A is a schematic diagram of the first left side surface showing the operation of the forward / backward swing mechanism.

FIG. 7B is a schematic diagram of the second left side surface showing the operation of the forward / backward swing mechanism.

FIG. 7C is a schematic diagram of the third left side view showing the operation of the forward / backward swing mechanism.

FIG. 8 is an overall perspective view of a balance exercise device according to another embodiment. FIG. 9 is an overall perspective view of an exercise apparatus according to another embodiment.

1 Seated balance

1B Surfing type

1C Ski-type balun

2 Installation section

3 seats

4 Base body

5 legs

6 Support legs

7 Oscillator

8 compartment

11 Swell swing mechanism

12 Forward / backward swing mechanism

13 Drive mechanism

20 First rotation axis

20A cylindrical cam surface

21 1st boss

22 steady rest mechanism

23 First support frame

24 Support bracket

25 Second support frame

26 Reducer

28 Drive shaft

29 Electric motor

31 Drive gear

32 1st gear

33 First cam member 36 Connecting material

38 steady rest pin

39 Sphere

40 crank cars

41 Ball receiver

42 Universal joint

43 2nd Boss

45 Second rotation axis

45A cylindrical cam surface

46 Crank mechanism

47 Conversion mechanism

48 3rd support frame

49 Second cam member

51 Protruding piece

52 Support pin

53 2nd gear

M user

F floor

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 7C show a balance exercise device 1 according to the present invention. This balance exercise device 1 becomes a sitting type used by the user M straddling!

As shown in FIG. 1, a sitting type balance exercise device 1 includes an installation part 2 installed on a floor surface F, and a seat 3 (supported above the installation part 2 and seated by a user M across the installation part 2). Boarding part).

[0014] The installation part 2 has a base body 4 arranged on the floor surface F, and leg parts 5 are projected forward and backward on both the left and right sides of the base body 4 !. Support legs 6 are inclined forward on the base body 4 And a storage portion 8 for storing a swinging device 7 for swinging the seat 3 is provided on the upper portion of the support leg 6.

A seat 3 is disposed above the storage portion 8. The seat 3 is formed in an elliptical shape in plan view, and its upper surface and outer peripheral surface are covered with a sheet material. An operation panel section 9 is provided on the front side of the seat 3. The operation panel section 9 is provided with a switch for starting, stopping, or switching modes.

[0015] The swing device 7 stored in the storage unit 8 imparts a balance movement to the seat 3, and also has a function of connecting the installation unit 2 and the seat 3 to each other. The lower side of 7 is connected to the installation part 2 side, and the upper side of the swing device 7 is connected to the seat 3 side.

In the description, the front-rear direction, the left-right direction, and the up-down direction of the balance exercise device 1 as viewed from the seated user M are the front-rear direction, the left-right direction (width direction), and the up-down direction in the present embodiment. This is consistent with the front-rear and left-right directions shown in Figs.

As shown in FIGS. 2 to 5, the oscillating device 7 includes a sway oscillating mechanism 11, a front / rear oscillating mechanism 12, and a swell sway provided on a substrate 10 formed in a rectangular plate shape. The moving mechanism 11 and the driving mechanism 13 that moves the front and rear swing mechanism 12 are configured. The substrate 10 is fixed in the storage unit 8.

The swaying oscillating mechanism 11 is fixed to the first rotation shaft 20 that is installed so as to face in the left-right direction and is rotationally driven by the drive mechanism 13, and is fixed to the middle portion in the axial direction of the first rotation shaft 20, and the first rotation A cylindrical cam surface 20A inclined with respect to the shaft 20, a first boss portion 21 slidably fitted into the cylindrical cam surface 20A, and a first boss portion 21 provided below the first boss portion 21 And an anti-sway mechanism 22 that restricts rotation with the rotating shaft 20. A seat 3 is provided above the first boss portion 21.

Specifically, the swell rocking mechanism 11 has a first support frame 23 provided on the left side and the front side of the substrate 10. A support bracket 24 having a bearing 30 is provided on the upper portion of the first support frame 23. A pair of second support frames 25, 25 are provided on the right side of the substrate 10 along the front-rear direction. From the first support frame 23 to the pair of second support frames 25, 25, the first rotating shaft 20 facing in the left-right direction passes through the bearing 30. It is supported rotatably. That is, the left end portion of the first rotating shaft 20 is rotatably supported by the first support frame 23, and the right end portion of the first rotating shaft 20 is rotatably supported by the pair of second support frames 25, 25. . A first gear 32 is provided on the first rotating shaft 20 located between the pair of second support frames 25, 25.

A drive mechanism 13 that rotates the first rotating shaft 20 is provided outside the pair of second support frames 25, 25.

The drive mechanism 13 has a speed reducer 26 arranged on the outer side (right side) of the second support frames 25, 25. The speed reducer 26 includes a gear case 27, a drive shaft 28 arranged to penetrate the gear case 27 in the left-right direction, a bearing 30 that rotatably supports the drive shaft 28 in the gear case 27, and a drive shaft. A gear mechanism (not shown) including a worm wheel fixed to 28 and a worm gear fitted therewith. An electric motor 29 is attached in front of the speed reducer 26, and the worm gear is attached to the tip of the output shaft.

[0018] The drive shaft 28 protruding from the left side of the gear case 27 is rotatably supported by a pair of second support frames 25, 25, and between the pair of second support frames 25, 25, the drive shaft Drive gear 31 is attached to 28. The drive gear 31 is meshed with a first gear 32 that is integrally attached to the first rotating shaft 20. Therefore, when the electric motor 29 is driven, the rotational force is transmitted from the drive gear 31 to the first gear 32 to the first rotation shaft 20. The first rotation shaft 20 is located in the middle of the first rotation shaft 20 in the axial direction. A first cam member 33 having a cylindrical cam surface 20A inclined with respect to the outer peripheral portion is provided. The first cam member 33 has a cylindrical shape and is coaxially attached to the first rotating shaft 20.

Specifically, as shown in FIG. 6, the first cam member 33 includes a columnar internal force member 34 having an end surface formed obliquely, and a columnar internal force member 34 on the end surface of the internal force member 34. The external force member 35 has an end face that abuts. In addition, both 34 and 35 are attached so that their end faces are in contact with each other and screwed together to be fixed to the first rotating shaft 20 so as not to be relatively rotatable. A cylindrical cam surface 20A is formed on the outer peripheral surface adjacent to the end surface of the external force member 35. A first boss portion 21 having a ring shape is slidably fitted into the cylindrical cam surface 20A of the first cam member 33 via a bearing 30. That is, the inner race of the bearing 30 is fitted to the cylindrical cam surface 20A so as not to be relatively rotatable, and the outer race of the bearing 30 is fitted to the inner wall of the first boss portion 21 so as not to be relatively rotatable. Therefore, the first boss portion 21 is rotatable relative to the first cam member 33 via the bearing 30! /.

Furthermore, a substantially columnar connection member 36 is attached to the upper end of the first boss portion 21, and a seat plate 37 is attached on the connection member 36. A cushion or the like is provided on the seat plate 37, and the seat 3 (boarding section) is configured. Accordingly, the substantially central portion of the seat plate 37 or the seat 3 is located above the first rotation shaft 20. As a result, even when the user M sits on the seat 3, the load is applied to the first rotating shaft 20 and the first support frame 23 without being decentered. It can be a structure.

At the lower part of the first boss portion 21, a steady pin 38 protrudes downward, and a ball portion 39 is formed at the tip of the steady pin 38.

On the other hand, a ball receiving portion 41 into which the above-described ball portion 39 is slidably fitted in a pivot shape is formed at the front end portion of the crankshaft 40 provided in the back-and-forth swing mechanism 12 described later. . In addition, the above-mentioned ball portion 39 is fitted into the ball receiving portion 41 from above to form a universal joint portion 42. The crankshaft 40 has a rear end portion that is opposed to the second boss portion 43 provided in the front-rear swing mechanism 12 so that the front end portion thereof can swing in the left-right direction and does not move in the front-rear direction. It is pivotally supported. Therefore, the steady rest pin 38 and the ball part 39 can be repeatedly swung with a predetermined width in the left-right direction, but do not move in the front-rear direction unless the second boss part 43 described later moves! / Get ready!

The crankshaft 40 and the universal joint portion 42 described above constitute the steady stop mechanism 22 that restricts the rotation of the first boss portion 21 along with the first rotation shaft 20.

The forward / backward swing mechanism 12 is a second rotating shaft 45 that is installed so as to face in the left-right direction and is rotationally driven by the drive mechanism 13, and a crank mechanism that converts the rotational motion of the second rotating shaft 45 into a back-and-forth reciprocating motion 46 and the reciprocating motion of the first boss 21 by the reciprocating motion of the crank mechanism 46. And a conversion mechanism 47 for converting into

Specifically, the forward / backward swing mechanism 12 includes a third support frame 48 provided on the left side and the rear side of the substrate 10 (on the rear side of the first support frame 23). A support bracket 24 having a bearing 30 is provided on the third support frame 48. Between the third support frame 48 and the pair of second support frames 25, 25 described above, a second rotating shaft 45 facing in the left-right direction is rotatably supported via a bearing 30. . The axial center height of the second rotating shaft 45 is lower than the first rotating shaft 20 in a side view.

A second cam member 49 (eccentric member) having a cylindrical cam surface 45A perpendicular to the second rotating shaft 45 (not inclined) at the outer peripheral portion is provided in the middle of the second rotating shaft 45 in the axial direction. It is. The second cam member 49 has a disk shape, and the second rotating shaft 45 passes through the eccentric position thereof.

[0024] The second boss portion 43 having a ring shape is slidably fitted into the cylindrical cam surface 45A of the second cam member 49 via the bearing 30! /. That is, the inner race of the bearing 30 is fitted into the cylindrical cam surface 45A so as not to be relatively rotatable, and the outer race of the bearing 30 is fitted into the inner wall of the second boss portion 43 so as not to be relatively rotatable. Therefore, the second boss portion 43 is rotatable relative to the second cam member 49 via the bearing 30! /.

Furthermore, projecting pieces 51, 51 projecting forward in a pair of upper and lower sides are provided at the front portion of the second boss portion 43. Between the projecting pieces 51, 51, a rear end of a crankshaft 40 having a rod shape is sandwiched. The rear end portion of the crankshaft 40 is pivotally supported by projecting pieces 51 and 51 via support pins 52 that face in the vertical direction. The crankshaft 40, the projecting pieces 51, 51 and the support pin 52 constitute a pivot portion at the front portion of the second boss portion 43.

[0025] The above-described ball receiving portion 41 is formed at the front end portion of the crankshaft 40. A universal joint portion 42 is configured by fitting a ball portion 39 provided at the lower end portion of the first box portion 21 into a pivot shape. In the case of the present embodiment, an opening 50 is provided in a portion of the substrate 10 facing (located below) the veg joint 42 that prevents the universal joint 42 from interfering with the substrate 10. Yes.

A second gear 53 is provided on the second rotating shaft 45 located between the pair of second support frames 25, 25, and the second gear 53 is meshed with the drive gear 31. Therefore, the electric motor By driving 29, the rotational force is transmitted from the drive gear 31 to the second gear 53 to the second rotation shaft 45. The first gear 32 is disposed on the front side of the drive gear 31, and the second gear 53 is disposed on the rear side of the drive gear 31. It should be noted that the gear ratio between the second gear 53 and the first gear 32 may be another gear ratio that is preferably 1: 4, for example, 1: 2.

[0026] The second cam member 49 described above, the second boss portion 43 slidably fitted on the outer periphery of the second cam member 49, and the crankshaft 40 connected to the second boss portion 43 and extending in the front-rear direction. Thus, a crank mechanism 46 that converts the rotary motion of the second rotary shaft 45 into the back-and-forth reciprocating motion is configured. The universal joint portion 42 constitutes a conversion mechanism 47 that converts the back-and-forth reciprocating motion by the crank mechanism 46 into the reciprocating rotational motion of the first boss portion 21.

The second rotating shaft 45, the crank mechanism 46, and the conversion mechanism 47 described above constitute the front / rear swing mechanism 12.

The operation mode of the seating type balance exercise apparatus 1 having the above-described configuration is as follows.

[0027] User M first sits in such a posture as to straddle seat 3, and uses operation panel unit 9 to turn on the start switch.

Then, the electric motor 29 of the drive mechanism 13 rotates, rotates the worm wheel via the worm gear, and the drive shaft 28 rotates. The rotation of the drive shaft 28 is transmitted from the drive gear 31 to the first gear 32, and accordingly, the first cam member 33 and the cylindrical cam surface 20A attached to the first rotation shaft 20 rotate, and the first boss portion 21 tries to rotate in the same direction. However, the ball portion 39 provided at the lower end portion of the first boss portion 21 is pivotally fitted into the ball receiving portion 41 provided at the front end portion of the crankshaft 40 so that the rotation is not possible. Be regulated

[0028] The cylindrical cam surface 20A formed on the first cam member 33 is inclined with respect to the first rotating shaft 20, and the ball receiving portion 41 into which the ball portion 39 is fitted is movable in the left-right direction. Therefore, as the first rotating shaft 20 rotates, the first boss portion 21 moves left and right. In addition, as the inclined cylindrical cam surface 20A rotates, when the front portion of the first boss portion 21 is swung to the left, the top surface of the first boss portion 21 is lowered to the left, and the front portion is swung to the right. When you are The movement of the wave swells so that the upper surface of the hill is descending to the right.

This movement is transmitted to the seat plate 37 and the seat 3 attached to the upper part of the first boss portion 21. As a result, the seat 3 reciprocates in the left-right direction, and when the front part of the seat 3 is swung to the left, the top surface is lowered to the left, and when the front part of the seat 3 is swung to the right, the top surface is swung. Will move to lower right.

On the other hand, when the electric motor 29 of the drive mechanism 13 rotates and the drive shaft 28 rotates, the rotation of the drive shaft 28 is transmitted from the drive gear 31 to the second gear 53. Along with this, the second rotating shaft 45 rotates, and the second cam member 49 provided in a relatively unrotatable manner on the second rotating shaft 45 rotates eccentrically.

Then, the second boss portion 43 fitted on the second cam member 49 and the crankshaft 40 connected to the front portion of the second boss portion 43 reciprocate in the front-rear direction. Then, the first boss portion 21 is repeated around the axis of the first rotating shaft 20 through a ball receiving portion 41 provided at the front portion of the crankshaft 40 and a ball portion 39 (a universal joint portion 42) fitted therein. It comes to rotate.

[0030] Such repeated rotation is transmitted to the seat plate 37 and the seat 3 attached to the upper portion of the first boss portion 21, and the seat 3 swings back and forth about the substantially center in the front-rear direction of the seat 3. It becomes like this. In particular, in the case of the present embodiment, as shown in FIG. 7A, when the second cam member 49 is protruded rearward, the steady pin 38 attached to the lower end of the first boss portion 21 is provided. The length of the crankshaft 40 is determined so that it faces downward and faces the ball 39 at the bottom. The seat 3 is attached to the upper portion of the first boss portion 21 in a position where force is applied with a forward inclination angle α.

[0031] As shown in FIG. 7B, when the second rotating shaft 45 rotates and the second cam member 49 protrudes upward, the crankshaft 40 moves forward. Accordingly, the first boss portion 21 rotates clockwise around the first rotation shaft 20, and the seat 3 becomes substantially horizontal.

When the second rotating shaft 45 further rotates, the second cam member 49 protrudes forward as shown in FIG. 7C. At this time, the steady pin 38 attached to the first boss portion 21 moves to the forefront side. Along with this, the first boss portion 21 further rotates clockwise, and the seat 3 tilts backward at an inclination angle of 0.

[0032] As the second rotary shaft 45 rotates, the seat 3 goes through the states shown in FIGS. Thus, the seat 3 swings back and forth within an angle range of an inclination angle α forward and an inclination angle / 3 backward. It should be noted that the front inclination angle α and the rear inclination angle 0 of the seat portion may be the same value or different.

Such back-and-forth swinging and right-and-left waviness are transmitted to the seat 3 at the same time, and the seat 3 moves in a complicated manner. Therefore, the user 着 who sits on the seat 3 becomes out of balance, and can strengthen muscles of each part of the body and strengthen the sense of balance, and promote health such as fins and diet. Can be achieved.

Note that the present invention is not limited to the above-described embodiment.

As an embodiment of the present invention, the sitting type balance exercise device 1 has been described as an example. However, as shown in FIG. 8, for example, a standing type balance exercise device 1B in the image of surfing may be used. In addition, as shown in FIG. 9, a standing-ride type balance exercise device 1 C in the image of skiing may be used. In the case of the ski-type balance exercise device 1C, it is very preferable to imagine stock and to provide two grip bars 60 on the front and both sides of the device.

Industrial applicability

[0034] The present invention can be suitably used as a balance exercise device that swings the seat while the user is seated on the seat and imparts a balance exercise to the user.

Claims

The scope of the claims

[1] An installation unit installed on the floor, and a boarding unit provided above the installation unit and on which a user can board,

Between the installation part and the boarding part, left and right reciprocating rocking is generated with respect to the boarding part, and when the front part of the boarding part is shaken leftward, the upper surface of the boarding part is lowered to the left or A swell swing mechanism that imparts a swell movement that causes the upper surface of the riding section to descend to the right or rise to the right when the front portion of the riding section is swung to the right, and the riding section is swung back and forth. A balance exercise device comprising: a forward / backward swing mechanism to be moved; and a drive mechanism for simultaneously driving the swell swing mechanism and the forward / backward swing mechanism.

[2] A wave swing mechanism is provided below the riding section, and a front / rear swing mechanism is provided below the wave swing mechanism, and the drive unit is disposed laterally to the wave swing mechanism and the front / back swing mechanism. 2. The balance exercise device according to claim 1, wherein the structure is deployed! /.

[3] The swell oscillating mechanism is constructed in a state of facing in the left-right direction and is rotated by the drive mechanism;

A cylindrical cam surface that is fixed in the middle of the first rotation shaft in the axial direction and is inclined with respect to the first rotation shaft;

A first boss portion slidably fitted into the cylindrical cam surface;

An anti-sway mechanism that is provided at a lower portion of the first boss portion and restricts the first boss portion from being rotated along with the first rotation shaft;

3. The balance exercise device according to claim 2, wherein the riding portion is provided on an upper portion of the first boss portion.

4. The balance exercise device according to claim 3, wherein the cylindrical cam surface is formed on an outer peripheral portion of a first cam member fixed to a midway portion in the axial direction of the first rotation shaft.

[5] The front-rear swing mechanism is a second rotary shaft that is installed so as to face in the left-right direction and is driven to rotate by the drive mechanism, and a clutch that converts the rotational motion of the second rotary shaft into a forward and backward reciprocating motion. 5. The balance exercise device according to claim 4, further comprising: a rank mechanism; and a conversion mechanism that converts a back-and-forth reciprocating motion by the crank mechanism into a reciprocating rotational motion of the first boss portion.

[6] The crank mechanism has a shaft center direction of a second rotating shaft disposed at a position lower than the first rotating shaft. A second force member fixed to the midway portion and eccentric with respect to the second rotating shaft, a second boss portion slidably fitted on the outer periphery of the second cam member, A crankshaft connected to the second boss portion and extending in the front-rear direction,

6. The balance exercise device according to claim 5, wherein the conversion mechanism includes a universal joint portion that connects a front end portion of the crankshaft and a lower end portion of the first boss portion.

[7] The steady rest mechanism includes the crankshaft, a universal joint portion connecting a front end portion of the crankshaft and a lower end portion of the first boss portion, and a rear end of the crankshaft with respect to the second boss portion. 7. The balance exercise device according to claim 6, further comprising: a pivot portion that pivots so that the portion can swing in the left-right direction and does not move in the front-rear direction.

[8] The universal joint portion includes a ball portion projecting from a lower portion of the first boss portion, and a ball receiving portion formed at a front end portion of the crankshaft and into which the ball portion is slidably fitted. The balance exercise device according to claim 6 or 7.