MUSCLE TRAINING DEVICE

TECHNICAL FIELD

The present disclosure relates to a muscle training device.

BACKGROUND

Japanese Patent No. 6482122 discloses a force generation device in which a rotating member rotates and winds up a string-like member, and a tensioning device, which is an elastic body such as a coil or spring, pulls the string-like member in a direction that pulls out the string-like member from the rotating member.

SUMMARY

However, in order for the force generation device of Japanese Patent No. 6482122 to be used as a training device, it is necessary for the force generation device to be combined with a transmission means and a frame, which makes the device large, and muscle training cannot be performed easily.

The present disclosure is to provide a muscle training device that allows a user to easily perform muscle training.

A muscle training device according to an aspect of the disclosed embodiments includes a flat plate for a user to board and a main body that is attachable to, and detachable from, the flat plate. The main body includes a base portion, an elastic body provided on the base portion, and a string having a first end portion connected to the elastic body, and a second end portion positioned on a side opposite to the first end portion. The elastic body is configured to apply, to the string, an elastic force that acts against a tensile force when the second end portion is pulled.

BRIEF DESCRIPTION OF DRAWINGS

In the drawings:

FIG. 1 is a perspective view of a muscle training device according to an embodiment of the present disclosure.

FIG. 2 is a perspective view of a state in which a main body has been detached from a first corner portion of a flat plate shown in FIG. 1.

FIG. 3 is a plan view of an attachment portion of the first corner portion of the flat plate shown in FIG. 2.

FIG. 4 is a perspective view in which the main body shown in FIG. 2 is viewed from a lower side.

FIG. 5 is a perspective view showing an internal structure of the main body shown in FIG. 1.

FIG. 6 is a plan view of the internal structure of the main body shown in FIG. 5.

FIG. 7 is an explanatory diagram of a fixing portion shown in FIGS. 5 and 6.

FIG. 8A is a perspective view showing a state in which the main body shown in FIG. 2 is abutted against the first corner portion of the flat plate, and FIG. 8B is a diagram showing a positional state of first plates and second plates of the main body and the flat plate in FIG. 8A.

FIG. 9A is a diagram showing a state in which the main body shown in FIG. 8A has been rotated in order to be fixed to the flat plate, and FIG. 9B is a diagram showing the positional state of the first plates and the second plates of the main body and the flat plate in FIG. 9A.

FIG. 10 is a diagram showing, in the positional state of the first plates and the second plates in FIG. 9B, a state in which the second plate is positioned on the lower side of the first plate.

FIG. 11 is a perspective view showing an internal structure of a main body that is different from the embodiment shown in FIG. 5.

FIG. 12 is a plan view of the internal structure of the main body shown in FIG. 11.

FIG. 13 is a perspective view showing an external appearance of a load increasing portion, a switching gear of a load switching portion, and a emergency stop portion shown in FIG. 11.

FIG. 14 is a diagram showing the internal structure of the main body shown in FIGS. 11 and 12, and is a perspective view in which the load increasing portion and the emergency stop portion have been omitted.

FIG. 15 is a plan view of the load switching portion shown in FIG. 14.

FIG. 16A is a perspective view of an upper side of the load switching portion shown in FIG. 14, and FIG. 16B is a perspective view of a lower side of the load switching portion shown in FIG. 14.

FIGS. 17A and 17B are diagrams showing the emergency stop portion shown in FIG. 13, where FIG. 17A is a plan view of the emergency stop portion in a non-stopping state, and FIG. 17B is a plan view of the emergency stop portion in a stopping state.

FIG. 18 is a perspective view of a rotating portion shown in FIG. 17.

FIG. 19 is a partial cross-sectional view of the rotating portion shown in FIG. 18.

FIG. 20 is a perspective view of a stopper portion shown in FIG. 17.

DETAILED DESCRIPTION

Hereinafter, a muscle training device according to embodiments of the present disclosure will be described with reference to the drawings, but the present invention is not limited only to the embodiments illustrated in the drawings.

First Embodiment

A muscle training device according to a first embodiment of the present disclosure will be described. FIG. 1 is a perspective view of the device. The muscle training device 1 includes a flat plate 10 for a user to board, and two main bodies 30.

The flat plate 10 has a substantially rectangular shape in plan view. The flat plate 10 includes a first side portion 11 and a second side portion 12 that extend in a X direction (predetermined direction), and a third side portion 13 and a fourth side portion 14 that extend in a Y direction, which is perpendicular to the X direction. The flat plate 10 further includes a first corner portion 15 and a second corner portion 16, where both end portions of the first side portion 11 are connected to the third side portion 13 and the fourth side portion 14, respectively, and a third corner portion 17 and a fourth corner portion 18, where both end portions of the second side portion 12 are connected to the third side portion 13 and the fourth side portion 14, respectively. In the flat plate 10, a pin insertion hole 10a (FIG. 2) is formed in the first corner portion 15.

The two main bodies 30 are each provided so as to be capable of being attached to, and detached from, the first corner portion 15 and the second corner portion 16. That is, the two main bodies 30 are provided so as to each be capable of being attached to, and detached from, both end portions of the first side portion 11. In the flat plate 10, the region other than the first corner portion 15 and the second corner portion 16 to which the two main bodies 30 are attached is a region on which the user can board. The outer edge of the third corner portion 17 is provided with a handle 19 that allows the user to lift the flat plate 10 that has been placed on a floor surface.

FIG. 2 is a perspective view of a state in which the main body 30 has been detached from the first corner portion 15 of the flat plate 10 shown in FIG. 1. FIG. 3 is a plan view of an attachment portion 20 of the first corner portion 15 of the flat plate 10 shown in FIG. 2. The first corner portion 15 of the flat plate 10 is provided with the attachment portion 20 for attaching the main body 30. The attachment portion 20 includes a fixing portion 21 and three first plates 22. The fixing portion 21 has a circular ring shape, and is fixed to the first corner portion 15. The three first plates 22 are plate-shaped pieces that are provided on an upper end of an inner periphery of the fixing portion 21 at equal intervals along a circumferential direction so as to protrude toward an inside of the fixing portion 21. The first plates 22 each have a gap 22a with an upper surface 10B of the flat plate 10 (see FIG. 10).

FIG. 4 is a perspective view in which the main body 30 shown in FIG. 2 is viewed from the lower side thereof. As shown in FIGS. 2 and 4, the main body 30 includes a housing 31. The housing 31 includes a base portion 31A (see FIGS. 5 and 6), and a substantially dome-shaped cover portion 31B.

As shown in FIG. 4, the base portion 31A is substantially disk-shaped (also see FIG. 6), and a lower surface 31C of the base portion 31A is provided with three second plates 31D. The lower surface 31C is an outer surface of the base portion 31A. The second plates 31D are plate-shaped pieces that are each joined to each other at a center portion of the base portion 31A, forming a substantially three-bladed propeller shape. That is, the three second plates 31D protrude radially outward at equal intervals from the center of the base portion 31A. The second plates 31D each have a gap 31e with the lower surface 31C of the base portion 31A (see FIG. 10).

The cover portion 31B is provided so as to cover the base portion 31A, and a lower side of the cover portion 31B is open. An outer peripheral portion of the base portion 31A is supported by a lower portion of the cover portion 31B, and a portion of the base portion 31A other than the outer peripheral portion is exposed from the opening on the lower side of the cover portion 31B. Therefore, the three second plates 31D provided on the base portion 31A are exposed to the outside.

FIG. 5 is a perspective view showing an internal structure of the main body 30 shown in FIG. 1. FIG. 6 is a plan view of the internal structure of the main body 30 shown in FIG. 5. In FIG. 6, illustration of an opening portion 31F and a connection portion 37C has been omitted. The main body 30 includes, inside the housing 31 (FIG. 1), a first spiral spring 32, which is an elastic body, a rope-winding pulley 33, two guide rollers 34, a pull-out pulley 35, three pull-out rollers 36A to 36C, a rope 37, which is a string, and a fixing portion 38.

The first spiral spring 32 is provided inside a first spiral spring case 32A. The first spiral spring case 32A is rotatable with respect to a first shaft 32B that is provided at a center of the first spiral spring case 32A, and which extends in an up-down direction. A center portion 32C of the first spiral spring 32 is fixed to the first shaft 32B. An outer end portion 32D of the first spiral spring 32 is fixed to the first spiral spring case 32A. The rope-winding pulley 33 is provided on a lower side of the first spiral spring case 32A. The first spiral spring case 32A is fixed to the rope-winding pulley 33. The rope-winding pulley 33 is rotatably supported with respect to the first shaft 32B, and is capable of rotating with the first spiral spring case 32A. A spiral-shaped groove 33a is formed on an outer peripheral surface of the rope-winding pulley 33. Three walls 33B having an arc shape are provided so as to surround a portion of an outer periphery of the rope-winding pulley 33. The three walls 33B prevent the rope 37 from bending when the rope 37 is rewound.

The two guide rollers 34 are rotatably provided by a roller shaft 34A extending in the up-down direction. The height of each guide roller 34 is substantially equal to the height of the rope-winding pulley 33. The pull-out pulley 35 is rotatably provided about an axis extending in a horizontal direction. The pull-out pulley 35 causes the direction of the rope 37 to change from substantially horizontal to substantially vertical. Among the three pull-out rollers 36A to 36C, two of the pull-out rollers 36A and 36B are positioned on an upper side of the pull-out pulley 35, with the two rotation axes parallel to each other and arranged side-by-side. The remaining pull-out roller 36C is positioned on an upper side of the two pull-out rollers 36A and 36B, and is provided in the opening portion 31F of the cover portion 31B so as to be rotatable about a rotation axis that is perpendicular to the rotation axes of the two pull-out rollers 36A and 36B.

The rope 37 includes a portion that is wound around the groove 33a of the rope-winding pulley 33, and a portion that passes from the rope-winding pulley 33 through the two guide rollers 34, the pull-out pulley 35, and the two pull-out rollers 36A and 36B, and exits to the outside from the opening portion 31F of the cover portion 31B. The first end portion 37A of the rope 37 is fixed to an uppermost portion of the groove 33a. Therefore, the first end portion 37A is connected to the outer end portion 32D of the first spiral spring 32 via the rope-winding pulley 33 and the first spiral spring case 32A. A second end portion 37B located on an opposite side of the first end portion 37A is positioned outside the opening portion 31F. A grip attachment portion 37D (see FIG. 11), to which a grip (not illustrated) that is gripped by a user is attached, and the connection portion 37C are connected to the second end portion 37B.

FIG. 7 is an explanatory diagram of the fixing portion 38 shown in FIGS. 5 and 6. FIG. 7 shows only a portion of the cover portion 31B. The fixing portion 38 includes a lock switch 38A, a lock pin 38B (see FIG. 4), and a lock spring 38C. The lock switch 38A is supported by the cover portion 31B so as to be capable of moving up and down. The lock pin 38B is connected to a portion of the lock switch 38A that is positioned on an inside of the cover portion 31B and extends downward, and a distal end of the lock pin 38B is capable of protruding below the cover portion 31B (see FIG. 4). The lock spring 38C is provided on a lower side of the opening portion 31F and abuts a portion of the lock switch 38A, and constantly downwardly biases the lock switch 38A and the lock pin 38B. When the lock switch 38A is not operated, the lock pin 38B protrudes below the cover portion 31B due to the lock spring 38C (FIG. 4).

Next, a method of attaching and detaching the main body 30 to the flat plate 10 will be described.

FIG. 8A is a perspective view showing a state in which the main body 30 shown in FIG. 2 is abutted against the first corner portion 15 of the flat plate 10, and FIG. 8B is a diagram showing a positional state of the first plates 22 and the second plates 31D of the main body 30 and the flat plate 10 in FIG. 8A. FIG. 9A is a diagram showing a state in which the main body 30 shown in FIG. 8A has been rotated in order to be fixed to the flat plate 10, and FIG. 9B is a diagram showing a positional state of the first plates 22 and the second plates 31D of the main body 30 and the flat plate 10 in FIG. 9A. FIG. 10 is a diagram showing, in the positional state of the first plates 22 and the second plates 31D in FIG. 9B, a state in which the second plate 31D is positioned on a lower side of the first plate 22.

In the state shown in FIG. 8A where the main body 30 is abutted against the first corner portion 15, as shown in FIG. 8B, the three second plates 31D each enter between the three first plates 22, and are in a positional relationship such that they do not interfere with each other. By rotating the main body 30 in the direction of arrow A, and sliding the three second plates 31D, as shown in FIG. 9B, the three second plates 31D and the three first plates 22 overlap each other. That is, as shown in FIG. 10, the second plate 31D is positioned on the lower side of the first plate 22. Consequently, separation of the main body 30 from the attachment portion 20 is restricted. As a result, the main body 30 is attached to the flat plate 10.

In the rotation position of the main body 30 shown in FIG. 9A, because the pin insertion hole 10a is positioned on the lower side of the fixing portion 38, the lock pin 38B (see FIG. 4) enters into the pin insertion hole 10a due to the lock spring 38C. As a result, rotation of the main body 30 with respect to the attachment portion 20 is restricted.

In the main body 30 shown in FIG. 9A, the lock switch 38A is pulled up, and the main body 30 is rotated in the direction opposite to arrow A in a state where the lock pin 38B (see FIG. 4) has been pulled out of the pin insertion hole 10a. By lifting up the main body 30 in a position where the three second plates 31D shown in FIG. 8B have each entered between the three first plates 22 and do not interfere with each other, the main body 30 is detached from the flat plate 10.

In the muscle training device 1 shown in FIG. 1, as a result of the user gripping and pulling a grip that has been attached to the grip attachment portion 37D (see FIG. 11) while on board the flat plate 10, the rope 37 is pulled, and the rope-winding pulley 33 rotates. Consequently, the first spiral spring case 32A that is fixed to the rope-winding pulley 33 rotates, and the first spiral spring 32, whose outer end portion 32D is fixed to the first spiral spring case 32A, is wound up. As a result, a force (elastic force) that tries to return the first spiral spring 32 to the original state is generated. The elastic force is applied to the rope 37 via the first spiral spring case 32A and the rope-winding pulley 33. Therefore, a load is applied to the muscles of the user that is gripping the grip (see FIG. 11), making it possible for the muscles of the user to be trained. In this way, when the second end portion 37B of the rope 37 that is connected to the first spiral spring 32, which is an elastic body, is pulled, an elastic force that acts against the tensile force is applied to the rope 37.

The muscle training device 1 includes the flat plate 10 for the user to board, and the main bodies 30 which can be attached to, and detached from, the flat plate 10. The main bodies 30 include the base portion 31A, the first spiral spring 32 provided on the base portion 31A, and the rope 37, which has the first end portion 37A connected to the first spiral spring 32, and the second end portion 37B positioned on the side opposite to the first end portion 37A. When the second end portion 37B is pulled, the first spiral spring 32 applies an elastic force that acts against the tensile force to the rope 37.

With such a configuration, a user can easily perform muscle training by attaching the main bodies 30 to the flat plate 10 on which the user boards. As a result of detaching the main bodies 30 from the flat plate 10, the weight of the muscle training device 1 can be dispersed while being carried, and the muscle training device 1 can be easily carried. The storability of the muscle training device 1 can be improved.

The two main bodies 30 are each provided so as to be capable of being attached to, and detached from, both end portions (the first corner portion 15 and the second corner portion 16) of the first side portion 11 of the flat plate 10, and the region other than both ends of the first side portion 11 of the flat plate 10 is a region on which the user can board. Consequently, the flat plate 10 can be made smaller, and therefore, the muscle training device 1 can be made smaller.

By sliding the main body 30 with respect to the attachment portion 20 of the flat plate 10, the second plates 31D of the main body 30 enter into the lower side of the first plates 22, and separation of the main body 30 from the attachment portion 20 is restricted. In this way, by sliding the main body 30 with respect to the attachment portion 20 of the flat plate 10, the main body 30 can be easily attached to, and detached from, the flat plate 10.

As a result of rotating the main body 30, because the second plates 31D enter into the lower side of the first plates 22, the main body 30 can be more easily attached to, and detached from, the flat plate 10.

Second Embodiment

A muscle training device 101 (see FIG. 1) according to a second embodiment of the present disclosure will be described. The same members as those of the muscle training device 1 according to the first embodiment will be denoted by the same reference signs, and the description will be omitted, while the configurations that are different to those of the muscle training device 1 according to the first embodiment will be described.

As shown in FIG. 1, the muscle training device 101 according to the present embodiment includes a flat plate 10 for a user to board, and two main bodies 130. The two main bodies 130 are each provided so as to be capable of being attached to, and detached from, the first corner portion 15 and the second corner portion 16. That is, the two main bodies 130 are provided so as to each be capable of being attached to, and detached from, both end portions of the first side portion 11. An internal structure of the main bodies 130 is different from the internal structure of the main bodies 30 according to the first embodiment.

FIG. 11 is a perspective view showing the internal structure of the main body 130 according to the second embodiment. FIG. 12 is a plan view of the internal structure of the main body 130 shown in FIG. 11. In FIG. 12, illustration of the opening portion 31F and the pull-out roller 36C has been omitted. FIG. 13 is a perspective view showing an external appearance of a load increasing portion 40, a switching gear 55 of a load switching portion 50, and an emergency stop portion 60 shown in FIG. 11.

The main body 130 includes, inside the housing 31, and in addition to the components 32 to 38 according to the first embodiment, the load increasing portion 40, the load switching portion 50, the emergency stop portion 60, and a second shaft 70. The load increasing portion 40, the load switching portion 50, the emergency stop portion 60, and the second shaft 70 are provided adjacent to the first spiral spring case 32A and the rope-winding pulley 33. As shown in FIG. 13, a centrifugal base 63 of the emergency stop portion 60 is provided on a lower side of a second spiral spring case 43 of the load increasing portion 40. The switching gear 55 of the load switching portion 50 is provided on a lower side of the centrifugal base 63. The second shaft 70, which extends in the up-down direction, passes through the second spiral spring case 43, the centrifugal base 63, and the switching gear 55. The second shaft 70 can be switched between a rotatable state and a non-rotatable state about its axis due to the load switching portion 50.

As shown in FIGS. 11 to 13, the load increasing portion 40 includes a first gear 41, a second spiral spring 42, the second spiral spring case 43, and a second gear 44. The first gear 41 is fixed to an outer periphery of the first spiral spring case 32A, and rotates integrally with the first spiral spring case 32A.

The second spiral spring 42 is provided inside the second spiral spring case 43. The second spiral spring case 43 is rotatable with respect to the second shaft 70 that passes through the center of the second spiral spring case 43. A center portion 42A of the second spiral spring 42 is fixed to the second shaft 70. An outer end portion 42B of the second spiral spring 42 is fixed to the second spiral spring case 43. The second gear 44 is fixed to an outer periphery of the second spiral spring case 43, and rotates integrally with the second spiral spring case 43. The second gear 44 is engaged with the first gear 41. When the rope 37 is pulled, the first spiral spring case 32A rotates clockwise in FIG. 12, and the second spiral spring case 43 rotates counterclockwise in FIG. 12. On the other hand, when the rope 37 is rewound, the first spiral spring case 32A rotates counterclockwise in FIG. 12, and the second spiral spring case 43 rotates clockwise in FIG. 12.

FIG. 14 is a diagram showing an internal structure of the main body 130 shown in FIGS. 11 and 12, and is a perspective view in which the load increasing portion 40 and the emergency stop portion 60 have been omitted. FIG. 15 is a plan view of the load switching portion 50 shown in FIG. 14. In FIG. 15, illustration of a push latch 51 is omitted. FIG. 16A is a perspective view of an upper side of the load switching portion 50 shown in FIG. 14, and FIG. 16B is a perspective view of a lower side of the load switching portion 50 shown in FIG. 14. The load switching portion 50 includes the push latch 51, a link plate 52, a switching lever 53, a switching spring 54, and a switching gear 55.

The push latch 51 includes a support base 51A, a latch case 51B, and a pressing movement portion 51C. The support base 51A is fixed to the base portion 31A. The latch case 51B includes an opening portion, and is fixed on the base portion 31A. The pressing movement portion 51C is inserted into the opening portion of the latch case 51B, and is supported so as to be capable of a sliding movement with respect to the latch case 51B. Each time the pressing movement portion 51C is pushed, the pressing movement portion 51C switches between a protruding state, in which the distal end portion of the pressing movement portion 51C protrudes from the opening portion of the latch case 51B, and a pushed-in state, in which a large part of the pressing movement portion 51C is pushed into the latch case 51B.

The link plate 52 is provided on a lower side of the pressing movement portion 51C and the latch case 51B, and one end portion is joined to the pressing movement portion 51C via a shaft (not illustrated). Therefore, the link plate 52 moves together with the movement of the pressing movement portion 51C. For example, the link plate 52 moves along the up-down direction in FIG. 15. The switching lever 53 is positioned further toward the lower side than the link plate 52, and is rotatably provided on the base portion 31A about a rotation axis 53A. A groove 53b is formed in the switching lever 53 on an end portion on a side opposite to the rotation axis 53A. A shaft 52A that extends from a lower surface on the other end portion of the link plate 52 is inserted into the groove 53b. A protrusion portion 53C is provided on an end surface of the switching lever 53 on the switching gear 55 side.

The switching spring 54 is provided inside the groove 53b of the switching lever 53. When the pressing movement portion 51C is in the pushed-in state, the switching spring 54 is pushed by the shaft 52A of the link plate 52, and biases the switching lever 53 toward the switching gear 55 and the second shaft 70. The switching gear 55 is fixed to a lower end of the second shaft 70.

Next, a method of switching the load in the muscle training device 101 according to the present embodiment will be described.

As a result of a user pressing and setting the pressing movement portion 51C to the pushed-in state, the switching spring 54 is pushed by the shaft 52A of the link plate 52, and the switching spring 54 biases the switching lever 53 toward the switching gear 55. As a result, the protrusion portion 53C of the switching lever 53 engages with the switching gear 55. When the switching gear 55 tries to rotate counterclockwise in FIG. 15, due to the positional relationship between the contact surface of the protrusion portion 53C and the switching gear 55, and the rotation axis 53A, the switching lever 53 receives a force that tries to rotate clockwise the switching lever 53 about the rotation axis 53A. Consequently, the switching lever 53 does not rotate, and the engagement between the protrusion portion 53C and the switching gear 55 is not released, which causes the rotation of the switching gear 55 to be restricted. That is, the switching gear 55 is set to a non-rotatable state in the counterclockwise direction, and the second shaft 70 is also set to a non-rotatable state in the counterclockwise direction. In this state, when a user grips and pulls the grip (the grip attachment portion 37D is pulled), the rope 37 is pulled, and the rope-winding pulley 33 rotates. Consequently, the first spiral spring case 32A that is fixed to the rope-winding pulley 33 rotates clockwise, and the first spiral spring 32, whose outer end portion 32D is fixed to the first spiral spring case 32A, is wound up.

As a result of the rotation of the first spiral spring case 32A, the second spiral spring case 43 rotates counterclockwise via the first gear 41 and the second gear 44. Because the switching gear 55 and the second shaft 70 do not rotate, and the center portion 42A of the second spiral spring 42 is fixed to the second shaft 70, the second spiral spring 42, which has the outer end portion 42B fixed to the second spiral spring case 43, is wound up. Consequently, a force (elastic force) that tries to return the first spiral spring 32 and the second spiral spring 42 to the original state is generated, and the elastic force of the first spiral spring 32 and the second spiral spring 42 is applied to the rope 37. In this way, because both the first spiral spring 32 and the second spiral spring 42 are wound up, and an elastic force is generated in two elastic bodies, the load can be increased.

On the other hand, when the user pushes and sets the pressing movement portion 51C to the protruding state, the link plate 52 is pulled toward the latch case 51B side, and the switching lever 53 rotates toward the latch case 51B side. As a result, the protrusion portion 53C separates from the switching gear 55, and the switching gear 55 is set to a rotatable state. In this state, when the user grips and pulls the grip, the rope 37 is pulled, and the rope-winding pulley 33 rotates. Consequently, the first spiral spring case 32A that is fixed to the rope-winding pulley 33 rotates clockwise, and the first spiral spring 32, whose outer end portion 32D is fixed to the first spiral spring case 32A, is wound up.

As a result of the rotation of the first spiral spring case 32A, the second spiral spring case 43 rotates counterclockwise via the first gear 41 and the second gear 44. Even when the second spiral spring case 43 rotates, because the switching gear 55 and the second shaft 70 are in a rotatable state, the entire second spiral spring 42 rotates, and the second spiral spring 42 is not wound up. Consequently, the elastic force of only the first spiral spring 32 is applied to the rope 37 via the first spiral spring case 32A and the rope-winding pulley 33. In this way, the load can be switched by setting the switching gear 55 to the non-rotatable state or the rotatable state using the load switching portion 50.

The link plate 52 and the switching lever 53 are connected via the switching spring 54. When the protrusion portion 53C and the switching gear 55 are engaged, and the switching gear 55 and the second shaft 70 are set to the non-rotatable state, although there is some play in the connection between the link plate 52 and the switching lever 53, the switching spring 54 ensures that the protrusion portion 53C is always engaged with the switching gear 55.

When the switching gear 55 is made non-rotatable, even if the protrusion portion 53C and the switching gear 55 climb up against each other, the play mentioned above can absorb such a mutually climbed-up state, the switching gear 55 rotates slightly due to the biasing force of the switching spring 54, and the protrusion portion 53C can be made to appropriately engage the switching gear 55.

As mentioned above, in a state where the protrusion portion 53C is engaged with the switching gear 55, when the switching gear 55 tries to rotate counterclockwise in FIG. 15, due to the positional relationship between the contact surface of the switching gear 55 and the protrusion portion 53C, and the rotation axis 53A, the switching lever 53 receives a force that tries to rotate clockwise the switching lever 53 about the rotation axis 53A. Consequently, the engagement between the protrusion portion 53C and the switching gear 55 is not released, which causes the counterclockwise rotation of the switching gear 55 to be restricted. On the other hand, in a state where the switching gear 55 is in a rotatable state and the rope 37 has been pulled out, when the load switching portion 50 is used to switch the switching gear 55 from the rotatable state to the non-rotatable state, and the rope 37 is wound up by the rope-winding pulley 33 due to the biasing force of the first spiral spring 32, because the second spiral spring case 43 rotates clockwise, the switching gear 55 also rotates clockwise in FIG. 15.

As a result, the second spiral spring 42 is wound in the reverse direction, which may cause the second spiral spring 42 to break. When the switching gear 55 has rotated clockwise in FIG. 15, the protrusion portion 53C is pushed by the switching gear 55, and due to the positional relationship between the contact surface and the rotation axis 53A, the switching lever 53 receives a force that tries to rotate counterclockwise the switching lever 53 about the rotation axis 53A. When the switching lever 53 receives a force that tries to rotate the switching lever 53 counterclockwise about the rotation axis 53A, the play in the connection portion between the link plate 52 and the switching lever 53, and the switching spring 54 cause the engagement with the switching gear 55 to be released. That is, the switching gear 55 is configured to function as a one-way gear. Consequently, the second spiral spring 42 can be prevented from being wound in the reverse direction, and the second spiral spring 42 can be prevented from breaking.

FIGS. 17A and 17B are diagrams showing the emergency stop portion 60 shown in FIG. 13, where FIG. 17A is a plan view of the emergency stop portion 60 in a non-stopping state, and FIG. 17B is a plan view of the emergency stop portion 60 in a stopping state. FIG. 18 is a perspective view of a rotating portion 61 shown in FIG. 17. FIG. 19 is a partial cross-sectional view of the rotating portion 61 shown in FIG. 18. FIG. 20 is a perspective view of a stopper portion 62 shown in FIG. 17. As shown in FIG. 13, the emergency stop portion 60 is provided on a lower side of the load increasing portion 40.

As shown in FIGS. 17A and 17B, the emergency stop portion 60 includes the rotating portion 61 and the stopper portion 62. As shown in FIGS. 17A, 17B, and 18, the rotating portion 61 includes the centrifugal base 63, two guide pins 64, two protruding pins 65, and two centrifugal springs 66. The centrifugal base 63 is substantially disk-shaped, and is fixed to a lower side of the second gear 44. The centrifugal base 63 rotates integrally with the second gear 44. The second shaft 70 passes through a center portion of the centrifugal base 63. The centrifugal base 63 has slits 63a formed at positions opposite to each other across the center portion. A cylindrical guide pin 64 is provided in each slit 63a so as to protrude outward.

The protruding pins 65 are made of metal material, have a cylindrical shape, and are provided on an outer periphery of the guide pins 64 so as to be capable of a sliding movement. Furthermore, as shown in FIGS. 18 and 19, the protruding pins 65 are covered with a resin material. The centrifugal springs 66 each have one end connected to the centrifugal base 63, and the other end connected to the protruding pin 65. The centrifugal springs 66 each pull the protruding pin 65 toward the center of the centrifugal base 63. As shown in FIG. 17A, in the emergency stop portion 60 in the non-stopped state, an outer end of each protruding pin 65 is positioned further toward the inner side than the outer peripheral surface of the centrifugal base 63 due to the tensile force of the centrifugal springs 66.

As shown in FIGS. 17A, 17B, and 20, the stopper portion 62 includes a support portion 67, a collision portion 68, and a shock absorbing material 69. The support portion 67 is fixed to the base portion 31A, and includes a collision receiving portion 67A along a portion of the outer periphery of the centrifugal base 63. The collision receiving portion 67A is formed having a groove 67b extending along a circumferential direction of the centrifugal base 63. The collision portion 68 and the shock absorbing material 69 are provided on the collision receiving portion 67A side-by-side along the circumferential direction of the centrifugal base 63. The shock absorbing material 69 is made of an elastic body. Therefore, the shock absorbing material 69 is configured to return to the original state even after being deformed by the collision portion 68. A collision pin 68A is fixed to the collision portion 68, and the collision pin 68A is inserted into the groove 67b of the collision receiving portion 67A.

If the user accidentally releases the grip attached to the grip attachment portion 37D, the rope 37 will be wound up by the rope-winding pulley 33 at high speed. The first gear 41, which is fixed to the rope-winding pulley 33 via the first spiral spring case 32A, and the second gear 44 that engages the first gear 41, rotate clockwise in FIG. 12 at high speed. Therefore, the centrifugal base 63 that is fixed to the second gear 44 also rotates clockwise in FIGS. 17A and 17B at high speed. As a result, a centrifugal force that is larger than the tensile force of the centrifugal springs 66 acts on the protruding pins 65, and as shown in FIG. 17B, the protruding pins 65 protrude further toward the outside than the outer peripheral surface of the centrifugal base 63. The protruding pins 65 that have protruded collide with the collision portion 68 of the stopper portion 62. Due to the collision of the protruding pins 65, the collision portion 68 slides toward the shock absorbing material 69 side, and the impact is absorbed by the shock absorbing material 69.

As a result, the rotation of the centrifugal base 63 stops, the rotation of the second gear 44 that is fixed to the centrifugal base 63 stops, the rotation of the first gear 41 that engages the second gear 44 stops, the rotation of the rope-winding pulley 33 stops, and the motion that rewinds the rope 37 stops. By pulling out the rope 37 slightly in a state where the protruding pins 65 are protruding from the centrifugal base 63 and abutting the collision portion 68 of the protruding stopper portion 62, the protruding pins 65 return to the original position due to the force of the centrifugal spring 66.

The muscle training device 101 includes the base portion 31A, the first spiral spring 32 and the second spiral spring 42 provided on the base portion 31A, and the rope 37, which has the first end portion 37A connected to the first spiral spring 32, and the second end portion 37B positioned on the side opposite to the first end portion 37A. When the second end portion 37B is pulled, the first spiral spring 32 and the second spiral spring 42 apply an elastic force that acts against the tensile force, to the rope 37. As a result of such a configuration, the load provided by the muscle training device 101 to the user can be increased by the first spiral spring 32 and the second spiral spring 42.

The muscle training device 101 further includes the load switching portion 50, which is capable of causing only the first spiral spring 32, or the first spiral spring 32 and the second spiral spring 42, to generate the elastic force that acts against the tensile force. The load switching portion 50 includes the switching lever 53 and the switching gear 55. The switching gear 55 is fixed to the second shaft 70, to which the center portion 42A of the second spiral spring 42 is fixed. The switching lever 53 engages the switching gear 55 to make the switching gear 55 the non-rotatable state, making the center portion 42A of the second spiral spring 42 the non-rotatable state, thereby making the second spiral spring 42 a windable state. Furthermore, the switching lever 53 separates from the switching gear 55 to make the switching gear 55 the rotatable state, making the center portion 42A of the second spiral spring 42 and the second shaft 70 the rotatable state, thereby making the second spiral spring 42 a non-windable state.

The muscle training device 101 provides the same effects as the muscle training device 1. Further, as a result of the above configuration related to the switching lever 53 and the switching gear 55, it is possible to switch the load according to the needs of the user, which can improve the usability of the muscle training device 101.

The muscle training device 101 further includes the emergency stop portion 60 that stops the rewinding of the rope 37 when the rope 37, to which a force from the user is not acting, is rewound due to the elastic force generated by the first spiral spring 32 and the second spiral spring 42 being applied to the rope 37. The emergency stop portion 60 includes the rotating portion 61 that rotates due to the elastic force, and the stopper portion 62 that stops the rotation of the rotating portion 61. The rotating portion 61 includes the protruding pins 65 that protrude to the outside of the rotating portion 61 due to the rotation caused by the elastic force. The stopper portion 62 causes the rotation of the rotating portion 61 to stop due to the collision of the protruding pins 65 that have protruded to the outside of the rotating portion 61, and stops the rewinding of the rope 37.

As a result of such a configuration, when the user releases the hands from the grip that is attached to the grip attachment portion 37D, it is possible for the rewinding of the rope 37 to be stopped, which can prevent breakage of the main bodies 130 of the muscle training device 101.

The techniques disclosed herein are not limited to the above embodiments, and can be modified in various forms without departing from the gist of the embodiments, and for example, the following modifications are also possible.

The flat plate 10 may be foldable. Although the main bodies 30 and 130 are provided on the corner portions 15 and 16 of the flat plate 10, they may be provided on locations other than the corner portions 15 and 16, and, for example, may be provided so as to be capable of being attached to, and detached from, a center portion of the flat plate 10 and the like. Although the flat plate 10 is substantially rectangular in plan view, other shapes, such as a trapezoidal shape, are possible. Although two spiral springs 32 and 42 are provided inside the main body 130 according to the second embodiment, it is possible to further increase the number of spiral springs to further increase the load. Although the emergency stop portion 60 is provided on the lower side of the load increasing portion 40, it may be provided on the lower side of the rope-winding pulley 33, or may be provided in the main body 30 of the muscle training device 1 according to the first embodiment.

A configuration is possible in which two main bodies are provided, the flat plate has a side portion extending in a predetermined direction, and the two main bodies are provided to be capable of being attached to, and detached from, both end portions of the side portion, respectively, and a region of the flat plate other than the both ends of the side portion is configured as a region on which a user can board.

A configuration is possible in which the flat plate is provided with an attachment portion to which the main body is attached, the attachment portion includes a first plate that is provided to have a gap with a surface of the flat plate, the main body includes a second plate that is provided on a lower surface side of the base portion to have a gap with the lower surface, and when the main body is made to slide with respect to the attachment portion of the flat plate, the second plate of the main body is configured to enter into a lower side of the first plate to restrict separation of the main body from the attachment portion.

A configuration is possible in which rotation of the main body is configured to cause the second plate of the main body to enter into a lower side of the first plate.

A muscle training device includes: a base portion; two elastic bodies provided on the base portion; and a string having a first end portion attached to one of the two elastic bodies, and a second end portion positioned on a side opposite to the first end portion; wherein the two elastic bodies are configured to apply, to the string, an elastic force that acts against a tensile force when the second end portion is pulled.

A configuration is possible in which the muscle training device further includes a switching portion, the two elastic bodies are a first mainspring and a second mainspring, the switching portion is configured to be capable of switching to generate the elastic force that acts against the tensile force in only the first spiral spring, or in the first spiral spring and the second spiral spring, the switching portion has a switching lever and a switching gear, the switching gear is fixed to a shaft to which a center portion of the second spiral spring is fixed, and the switching lever is configured to engage with the switching gear to make the switching gear a non-rotatable state, making the center portion of the second spiral spring a non-rotatable state, and making the second spiral spring a windable state, or, the switching lever is configured to separate from the switching gear to make the switching gear a rotatable state, making the center portion of the second spiral spring, together with the shaft, a rotatable state, and making the second spiral spring a non-windable state.

A configuration is possible in which the muscle training device further includes an emergency stop portion that is configured to stop the string from being pulled back when the string, to which a force from the user is not acting, is pulled back due to the elastic force generated by the two elastic bodies that is applied to the string. The emergency stop portion is provided with a rotating portion that is configured to rotate due to the elastic force, and a stopper portion that is configured to stop a rotation of the rotating portion, the rotating portion has a protruding pin that is configured to protrude outside the rotating portion due to a rotation caused by the elastic force, and the stopper portion is configured to stop a rotation of the rotating portion due to collision of the protruding pin that has protruded outside the rotating portion, and to stop the string from being pulled back.

	Number	Date	Country
Parent	PCT/JP2023/009907	Mar 2023	WO
Child	18905291		US

MUSCLE TRAINING DEVICE

Information

Publication Number

Date Filed

Date Published

Inventors

Original Assignees

CPC

International Classifications

Abstract

Description

Claims

Priority Claims (1)

CROSS REFERENCE TO RELATED APPLICATIONS

Continuations (1)