Muscle training apparatus

Abstract

To provide a muscle training apparatus that allows a user to do muscle training easily.SOLUTION: A muscle training apparatus 1 includes a flat plate 10 for a user to get on and a body 30 that can be attached to / detached from the flat plate. The body includes a base part, an elastic body provided in the base part, and a string having a first end part connected to the elastic body and a second end part positioned on a side opposite to the first end part. The elastic body is constituted so that when the second end part is pulled, elastic force against tensile force is imparted to the string.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This disclosure relates to a muscle training device.

Background Art

[0002] Patent Document 1 discloses a force generating device configured such that a rotating member winds up a string-like member by rotation, and a tension device, which is an elastic body such as a coil, a spring, or a spring, pulls the string-like member in a direction to pull it out from the rotating member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the force generating device of Patent Document 1, in order to be used as a training device, it needs to be combined with transmission means and a frame, so the device becomes large and muscle training cannot be easily performed.

[0005] The present invention has been made based on the above circumstances, and an object thereof is to provide a muscle training device that allows a user to easily perform muscle training.

Means for Solving the Problems

[0006] A muscle training device according to one embodiment of the present disclosure includes a flat plate for a user to mount on, and a main body that can be attached to and detached from the flat plate. The main body has a base portion, an elastic body provided on the base portion, a string having a first end portion connected to the elastic body and a second end portion located on the opposite side of the first end portion, and the elastic body is configured to apply an elastic force that resists a tensile force to the string when the second end portion is pulled.

[0007] The aforementioned body is provided in two parts, the flat plate having a side portion extending in a predetermined direction, the two bodies being attached to and detachably from both ends of the side portion, and the area of ​​the flat plate other than both ends of the side portion may be configured as an area on which a user can stand.

[0008] The flat plate has a mounting portion to which the main body is attached, the mounting portion has a first plate provided with a gap between it and the surface of the flat plate, and the main body has a second plate provided on the lower surface side of the base portion with a gap between it and the lower surface, and the main body may be configured such that by sliding the main body relative to the mounting portion of the flat plate, the second plate of the main body moves under the first plate, thereby restricting the main body from separating from the mounting portion.

[0009] The main body may be configured such that, by rotating it, the second plate of the main body fits under the first plate.

[0010] A muscle training device according to one embodiment of the present disclosure comprises a base portion, two elastic bodies provided on the base portion, and a string having a first end attached to one of the two elastic bodies and a second end located on the opposite side of the first end, wherein the two elastic bodies are configured to impart an elastic force to the string that resists tensile force when the second end is pulled.

[0011] The two elastic bodies are a first mainspring and a second mainspring, and the device further includes a switching unit that can be switched to generate the elastic force resisting the tensile force in only the first mainspring, or in both the first and second mainsprings, wherein the switching unit has a switching lever and a switching gear, and the switching gear is fixed to a shaft to which the center of the second mainspring is fixed, and the switching lever engages with the switching gear to make the switching gear non-rotatable, making the center of the second mainspring non-rotatable and allowing the second mainspring to be wound up, or the switching lever disengages from the switching gear to make the switching gear rotatable, making the center of the second mainspring rotatable with the shaft and allowing the second mainspring to be wound up.

[0012] The present invention further includes an emergency stop unit that prevents the string from being pulled back when the string is pulled back by the elastic force generated in the two elastic bodies and applied to the string, and the emergency stop unit comprises a rotating part that rotates due to the elastic force and a stopper part that stops the rotation of the rotating part, the rotating part having a protruding pin that protrudes outward from the rotating part due to the rotation due to the elastic force, and the stopper part may be configured to stop the rotation of the rotating part by colliding with the protruding pin that protrudes outward from the rotating part, thereby preventing the string from being pulled back. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a muscle training device that allows users to easily perform muscle training. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a muscle training device according to an embodiment of the present disclosure. [Figure 2] Figure 1 is a perspective view showing the main body removed from the first corner of the flat plate. [Figure 3]It is a plan view of the attachment portion of the first corner of the flat plate shown in FIG. 2. [Figure 4] It is a perspective view of the main body shown in FIG. 2 as viewed from below. [Figure 5] It is a perspective view showing the internal structure of the main body shown in FIG. 1. [Figure 6] It is a plan view of the internal structure of the main body shown in FIG. 5. [Figure 7] It is an explanatory view of the fixing portion shown in FIGS. 5 and 6. [Figure 8] (a) is a perspective view showing a state where the main body shown in FIG. 2 is brought into contact with the first corner of the flat plate, and (b) is a view showing the positional relationship between the first plate and the second plate in the main body and the flat plate of (a). [Figure 9] (a) is a view showing a state where the main body shown in FIG. 8(a) is rotated to fix it to the flat plate, and (b) is a view showing the positional relationship between the first plate and the second plate in the main body and the flat plate of (a). [Figure 10] It is a view showing a state where the second plate is located below the first plate in the positional relationship between the first plate and the second plate in FIG. 9(b). [Figure 11] It is a perspective view showing the internal structure of a main body different from the form shown in FIG. 5. [Figure 12] It is a plan view of the internal structure of the main body shown in FIG. 11. [Figure 13] It is an external perspective view of the load increasing portion, the switching gear of the load switching portion, and the emergency stop portion shown in FIG. 11. [Figure 14] It is a view showing the internal structure of the main body shown in FIGS. 11 and 12, which is a perspective view omitting the load increasing portion and the emergency stop portion [Figure 15] It is a plan view of the load switching portion shown in FIG. 14. [Figure 16] (a) is an upper perspective view of the load switching portion shown in FIG. 14, and FIG. 16(b) is a lower perspective view of the load switching portion shown in FIG. 14. [Figure 17] It is the emergency stop portion shown in FIG. 13. (a) is a plan view of the emergency stop portion in the non-stop state, and (b) is a plan view of the emergency stop portion in the stop state. [Figure 18] It is a perspective view of the rotating part shown in FIG. 17. [Figure 19] It is a partial cross-sectional view of the rotating part shown in FIG. 18. [Figure 20] It is a perspective view of the stopper part shown in FIG. 17.

Mode for Carrying Out the Invention

[0015] Hereinafter, the muscle training device according to the embodiment of the present disclosure will be described with reference to the drawings. However, the present invention is not limited only to the embodiments described in the drawings.

[0016] <First Embodiment> The muscle training device according to the first embodiment of the present disclosure will be described. FIG. 1 is a perspective view of the device. The muscle training device 1 has a flat plate 10 for the user to lie on and two main bodies 30.

[0017] The flat plate 10 is substantially rectangular in plan view. The flat plate 10 has a first side portion 11 and a second side portion 12 extending in the X direction (predetermined direction), and a third side portion 13 and a fourth side portion 14 extending in the Y direction orthogonal to the X direction. The flat plate 10 further has a first corner portion 15 and a second corner portion 16 where both ends of the first side portion 11 are connected to the third side portion 13 and the fourth side portion 14, and a third corner portion 17 and a fourth corner portion 18 where both ends of the second side portion 12 are connected to the third side portion 13 and the fourth side portion 14. In the flat plate 10, a pin insertion hole 10a (FIG. 2) is formed at the first corner portion 15.

[0018] The two main bodies 30 are respectively provided so as to be attachable and detachable to the first corner portion 15 and the second corner portion 16. That is, the two main bodies 30 are respectively provided so as to be attachable and detachable to both ends of the first side portion 11. In the flat plate 10, the regions other than the first corner portion 15 and the second corner portion 16 where the two main bodies 30 are attached are regions where the user can lie. A handle 19 for the user to lift the flat plate 10 placed on the floor surface is provided on the outer edge of the third corner portion 17. <00001

[0019] Figure 2 is a perspective view of the flat plate 10 shown in Figure 1 with the main body 30 removed from the first corner 15. Figure 3 is a plan view of the mounting portion 20 of the first corner 15 of the flat plate 10 shown in Figure 2. The first corner 15 of the flat plate 10 is provided with a mounting portion 20 for attaching the main body 30. The mounting portion 20 has a fixing portion 21 and three first plates 22. The fixing portion 21 is annular and fixed to the first corner 15. The three first plates 22 are plate-shaped pieces and are provided at equal intervals along the circumferential direction at the upper end of the inner circumference of the fixing portion 21, so as to protrude inward. Each first plate 22 has a gap 22a between it and the upper surface 10B of the flat plate 10 (see Figure 10).

[0020] Figure 4 is a perspective view of the main body 30 shown in Figure 2, viewed from below. As shown in Figures 2 and 4, the main body 30 includes a housing 31. The housing 31 has a base portion 31A (see also Figures 5 and 6) and a roughly dome-shaped cover portion 31B.

[0021] As shown in Figure 4, the base portion 31A is roughly disc-shaped (see also Figure 6), and three second plates 31D are provided on its lower surface 31C. Each second plate 31D is a plate-like piece, connected to each other in the center of the base portion 31A, forming a roughly 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. Each second plate 31D has a gap 31e between it and the lower surface 31C of the base portion 31A (see Figure 10).

[0022] The cover portion 31B is provided so as to cover the base portion 31A and has an opening at the bottom. The outer periphery of the base portion 31A is supported by the lower portion of the cover portion 31B, and the portion other than the outer edge is exposed through the opening at the bottom of the cover portion 31B. Therefore, the three second plates 31D provided on the base portion 31A are exposed to the outside.

[0023] Figure 5 is a perspective view showing the internal structure of the main body 30 shown in Figure 1. Figure 6 is a plan view of the internal structure of the main body 30 shown in Figure 5. In Figure 6, the opening 31F and the connecting part 37C are not shown. The main body 30 contains, within the housing 31 (Figure 1), a first 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 part 38.

[0024] The first mainspring 32 is housed within the first mainspring case 32A. The first mainspring case 32A is rotatable with respect to a first shaft 32B that extends vertically and is located at its center. The central part 32C of the first mainspring 32 is fixed to the first shaft 32B. The outer end 32D of the first mainspring 32 is fixed to the first mainspring case 32A. The rope winding pulley 33 is located below the first mainspring case 32A. The first mainspring 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 rotatable together with the first mainspring case 32A. A helical groove 33a is formed on the outer circumferential surface of the rope winding pulley 33. Three arc-shaped walls 33B are provided on the outer circumferential surface of the rope winding pulley 33, enclosing a portion of it. The three walls 33B prevent the rope 37 from bending when it is rewound.

[0025] The two guide rollers 34 are rotatably mounted by roller shafts 34A extending in the vertical direction. The height of each guide roller 34 is approximately equal to the height of the rope winding pulley 33. The pull-out pulley 35 is rotatably mounted around an axis extending in the horizontal direction. The pull-out pulley 35 changes the direction of the rope 37 from approximately horizontal to approximately vertical. Two of the three pull-out rollers 36A to 36C, the pull-out rollers 36A and 36B, are located above the pull-out pulley 35, and their axes of rotation are arranged side by side parallel to each other. The remaining pull-out roller 36C is located above the two pull-out rollers 36A and 36B, and is rotatably mounted in the opening 31F of the cover portion 31B around an axis of rotation perpendicular to the axes of rotation of the two pull-out rollers 36A and 36B.

[0026] The rope 37 has a portion wound around the groove 33a of the rope winding pulley 33, and a portion that passes from the rope winding pulley 33 between two guide rollers 34, a pull-out pulley 35, and two pull-out rollers 36A and 36B, and exits to the outside through the opening 31F of the cover portion 31B. The first end 37A of the rope 37 is fixed to the top of the groove 33a. Thus, the first end 37A is connected to the outer end 32D of the first mainspring 32 via the rope winding pulley 33 and the first mainspring case 32A. The second end 37B, located on the opposite side of the first end 37A, is located outside the opening 31F. The second end 37B is connected to a grip mounting portion 37D and a connecting portion 37C to which a user-held grip (not shown) is attached.

[0027] Figure 7 is an explanatory diagram of the fixing part 38 shown in Figures 5 and 6. In Figure 7, only a part of the cover part 31B is shown. The fixing part 38 comprises a lock switch 38A, a lock pin 38B (Figure 4), and a lock spring 38C. The lock switch 38A is supported by the cover part 31B so as to be able to move up and down. The lock pin 38B is connected to the part of the lock switch 38A located inside the cover part 31B, extends downward, and the tip of the lock pin 38B can protrude below the cover part 31B (Figure 4). The lock spring 38C is provided on the lower side of the opening 31F and contacts a part of the lock switch 38A, constantly biasing the lock switch 38A and the lock pin 38B downward. When the lock switch 38A is not operated, the lock spring 38C causes the lock pin 38B to protrude below the cover part 31B (Figure 4).

[0028] Next, we will explain how to attach and detach the main unit 30 from the flat plate 10.

[0029] Figure 8(a) is a perspective view showing the main body 30 shown in Figure 2 in contact with the first corner 15 of the flat plate 10, and Figure 8(b) is a diagram showing the positional state of the first plate 22 and the second plate 31D on the main body 30 and flat plate 10 as shown in Figure 8(a). Figure 9(a) shows the main body 30 shown in Figure 8(a) rotated to fix it to the flat plate 10, and Figure 9(b) is a diagram showing the positional state of the first plate 22 and the second plate 31D on the main body 30 and flat plate 10 as shown in Figure 9(a). Figure 10 is a diagram showing the positional state of the first plate 22 and the second plate 31D as shown in Figure 9(b), with the second plate 31D positioned below the first plate 22.

[0030] As shown in Figure 8(a), when the main body 30 is in contact with the first corner 15, as shown in Figure 8(b), the three second plates 31D are positioned between the three first plates 22, so as not to 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 Figure 9(b), the three second plates 31D and the three first plates 22 overlap each other. That is, as shown in Figure 10, the second plates 31D are positioned below the first plates 22. This restricts the main body 30 from moving away from the mounting portion 20. As a result, the main body 30 is attached to the flat plate 10.

[0031] In the rotational position of the main body 30 shown in Figure 9(a), the pin insertion hole 10a is located below the fixing part 38, so the lock pin 38B (Figure 4) enters the pin insertion hole 10a by the lock spring 38C. This restricts the rotation of the main body 30 relative to the mounting part 20.

[0032] In the main body 30 shown in Figure 9(a), the lock switch 38A is pulled up and the lock pin 38B (Figure 4) is removed from the pin insertion hole 10a, and the main body 30 is rotated in the opposite direction to arrow A. The three second plates 31D shown in Figure 8(b) are each placed between the three first plates 22, and when they are in a position where they do not interfere with each other, the main body 30 is lifted up and removed from the flat plate 10.

[0033] In the muscle training device 1 shown in Figure 1, when a user stands on the flat plate 10 and grasps and pulls the grip attached to the grip mounting part 37D (Figure 11), the rope 37 is pulled and the rope winding pulley 33 rotates. As a result, the first spring case 32A, to which the rope winding pulley 33 is fixed, rotates, and the first spring 32, whose outer end 32D is fixed to the first spring case 32A, is tightened. As a result, a force (elastic force) is generated in the first spring 32 that tries to return it to its original state. This elastic force is applied to the rope 37 via the first spring case 32A and the rope winding pulley 33. Therefore, a load is placed on the muscles of the user who grasps the grip (Figure 11), and the user's muscles can be trained. In this way, the device is configured so that when the second end 37B of the rope 37 to which the elastic first spring 32 is connected is pulled, an elastic force that resists the tensile force is applied to the rope 37.

[0034] The muscle training device 1 comprises a flat plate 10 on which the user stands, and a main body 30 that can be attached to and detached from the flat plate 10. The main body 30 has a base portion 31A, a first spring 32 provided on the base portion 31A, and a rope 37 having a first end portion 37A connected to the first spring 32 and a second end portion 37B located on the opposite side of the first end portion 37A. The first spring 32 is configured to impart an elastic force to the rope 37 that resists tensile force when the second end portion 37B is pulled.

[0035] With this configuration, users can easily perform muscle training simply by attaching the main unit 30 to the flat plate 10 on which they stand. By removing the main unit 30 from the flat plate 10, the weight can be distributed when carrying the device, making it easier to transport the muscle training device 1. This also improves the storage capacity of the muscle training device 1.

[0036] The two main bodies 30 are attached to and detachably from both ends (first corner 15 and second corner 16) of the first side 11 of the flat plate 10, respectively. The area of ​​the flat plate 10 other than both ends of the first side 11 is configured as an area on which a user can stand. This allows for miniaturization of the flat plate 10, and consequently, miniaturization of the muscle training device 1.

[0037] By sliding the main body 30 against the mounting portion 20 of the flat plate 10, the second plate 31D of the main body 30 enters below the first plate 22, thereby restricting the main body 30 from separating from the mounting portion 20. In this way, by sliding the main body 30 against the mounting portion 20 of the flat plate 10, the main body 30 can be easily attached to and detached from the flat plate 10.

[0038] Since the main body 30 is configured to rotate so that the second plate 31D fits under the first plate 22, the attachment and detachment of the main body 30 to the flat plate 10 can be made even easier.

[0039] <Second Embodiment> Next, a muscle training device 101 (see Figure 1) according to a second embodiment of this disclosure will be described. Components identical to those in the muscle training device 1 of the first embodiment will be given the same reference numerals and their descriptions will be omitted. A description will focus on the configurations that differ from those in the muscle training device 1 of the first embodiment.

[0040] As shown in Figure 1, the muscle training device 101 of this embodiment has a flat plate 10 on which the user stands and two main bodies 130. The two main bodies 130 are attached to and detachably at the first corner 15 and the second corner 16, respectively. That is, the two main bodies 130 are attached to and detachably at both ends of the first side 11, respectively. The internal structure of the main body 130 differs from the internal structure of the main body 30 of the first embodiment.

[0041] Figure 11 is a perspective view showing the internal structure of the main body 130 according to the second embodiment. Figure 12 is a plan view of the internal structure of the main body 130 shown in Figure 11. In Figure 12, the opening 31F and the pull-out roller 36C are not shown. Figure 13 is an external perspective view of the load increasing section 40, the switching gear 55 of the load switching section 50, and the emergency stop section 60 shown in Figure 11.

[0042] The main body 130, within the housing 31, includes, in addition to the components 32-38 of the first embodiment, a load increasing unit 40, a load switching unit 50, an emergency stop unit 60, and a second shaft 70. The load increasing unit 40, load switching unit 50, emergency stop unit 60, and second shaft 70 are provided adjacent to the first spring case 32A and the rope winding pulley 33. As shown in Figure 13, the centrifugal base 63 of the emergency stop unit 60 is provided below the second spring case 43 of the load increasing unit 40, and the switching gear 55 of the load switching unit 50 is provided below the centrifugal base 63. The second shaft 70, which extends in the vertical direction, passes through the second spring case 43, the centrifugal base 63, and the switching gear 55. The second shaft 70 is configured to be switchable or immobile around its axis by the load switching unit 50.

[0043] As shown in Figures 11-13, the load increasing section 40 includes a first gear 41, a second mainspring 42, a second mainspring case 43, and a second gear 44. The first gear 41 is fixed to the outer circumference of the first mainspring case 32A and rotates integrally with the first mainspring case 32A.

[0044] The second mainspring 42 is housed within the second mainspring case 43. The second mainspring case 43 is rotatable with respect to a second shaft 70 that passes through its center. The central part 42A of the second mainspring 42 is fixed to the second shaft 70. The outer end 42B of the second mainspring 42 is fixed to the second mainspring case 43. The second gear 44 is fixed to the outer circumference of the first mainspring case 32A and rotates integrally with the first mainspring case 32A. The second gear 44 meshes with the first gear 41. When the rope 37 is pulled, the first mainspring case 32A rotates clockwise in Figure 12, and the second mainspring case 43 rotates counterclockwise in Figure 12. Conversely, when the rope 37 is unwound, the first mainspring case 32A rotates counterclockwise in Figure 12, and the second mainspring case 43 rotates clockwise in Figure 12.

[0045] Figure 14 is a perspective view showing the internal structure of the main body 130 shown in Figures 11 and 12, with the load increasing section 40 and the emergency stop section 60 omitted. Figure 15 is a plan view of the load switching section 50 shown in Figure 14. In Figure 15, the push latch 51 is not shown. Figure 16(a) is an upper perspective view of the load switching section 50 shown in Figure 14, and Figure 16(b) is a lower perspective view of the load switching section 50 shown in Figure 14. The load switching section 50 includes a push latch 51, a link plate 52, a switching lever 53, a switching spring 54, and a switching gear 55.

[0046] The push latch 51 comprises a support base 51A, a latch case 51B, and a pressing and moving part 51C. The support base 51A is fixed to the base portion 31A. The latch case 51B has an opening and is fixed on the base portion 31A. The pressing and moving part 51C is inserted into the opening of the latch case 51B and is supported so as to be slidable relative to the latch case 51B. Each time the pressing and moving part 51C is pressed, the pressing and moving part 51C is configured to switch between a protruding state in which its tip protrudes from the opening of the latch case 51B and a pressed state in which most of it is pushed into the latch case 51B.

[0047] The link plate 52 is located below the pressing and moving part 51C and the latch case 51B, and one end is connected to the pressing and moving part 51C via a shaft (not shown). Therefore, the link plate 52 moves in conjunction with the movement of the pressing and moving part 51C. For example, the link plate 52 moves along the vertical direction in Figure 15. The switching lever 53 is located below the link plate 52 and is rotatably mounted on the base part 31A around the rotation axis 53A. A groove 53b is formed at the end of the switching lever 53 opposite to the rotation axis 53A. A shaft 52A extending from the lower surface of the other end of the link plate 52 is inserted into the groove 53b. A projection 53C is provided on the end face of the switching lever 53 on the side of the switching gear 55.

[0048] The switching spring 54 is located in the groove 53b of the switching lever 53. When the pressing movement part 51C is in the pressed position, the switching spring 54 is pushed by the shaft 52A of the link plate 52, biasing the switching lever 53 toward the switching gear 55 and the second shaft 70. The switching gear 55 is fixed to the lower end of the second shaft 70.

[0049] Next, a method for switching the load in the muscle training device 101 of this embodiment will be described.

[0050] When the user presses the push-in mechanism 51C, the switching spring 54 is pushed against 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 projection 53C of the switching lever 53 engages with the switching gear 55. When the switching gear 55 attempts to rotate counterclockwise in Figure 15, the positional relationship between the contact surface of the projection 53C and the switching gear 55 and the rotation axis 53A causes the switching lever 53 to experience a force that attempts to rotate it clockwise around the rotation axis 53A. Therefore, the switching lever 53 does not rotate, and the engagement between the projection 53C and the switching gear 55 does not disengage, thus restricting the rotation of the switching gear 55. In other words, the switching gear 55 becomes unable to rotate counterclockwise, and the second shaft 70 also becomes unable to rotate counterclockwise. In this state, when the user grasps and pulls the grip (the grip mounting portion 37D is pulled), the rope 37 is pulled and the rope winding pulley 33 rotates. As a result, the first mainspring case 32A fixed to the rope winding pulley 33 rotates clockwise, and the first mainspring 32, whose outer end 32D is fixed to the first mainspring case 32A, is wound up.

[0051] The rotation of the first spring case 32A causes the second spring case 43 to rotate counterclockwise via the first gear 41 and the second gear 44. Since the switching gear 55 and the second shaft 70 do not rotate, and the center 42A of the second spring 42 is fixed to the second shaft 70, the second spring 42, whose outer end 42B is fixed to the second spring case 43, is tightened. As a result, a force (elastic force) is generated in the first spring 32 and the second spring 42 that tries to return them to their original state, and the elastic force of the first spring 32 and the second spring 42 is applied to the rope 37. In this way, both the first spring 32 and the second spring 42 are tightened, and elastic force is generated in the two elastic bodies, so the load can be increased.

[0052] On the other hand, when the user presses the press-movement part 51C to make it protrude, the link plate 52 is pulled toward the latch case 51B, and the switching lever 53 rotates toward the latch case 51B. As a result, the projection 53C separates from the switching gear 55, and the switching gear 55 becomes rotatable. In this state, when the user grasps and pulls the grip, the rope 37 is pulled and the rope winding pulley 33 rotates. As a result, the first mainspring case 32A fixed to the rope winding pulley 33 rotates clockwise, and the first mainspring 32, whose outer end 32D is fixed to the first mainspring case 32A, is wound up.

[0053] The rotation of the first spring case 32A causes the second spring case 43 to rotate counterclockwise via the first gear 41 and the second gear 44. Even though the second spring case 43 rotates, the switching gear 55 and the second shaft 70 remain rotatable, so the entire second spring 42 rotates, and the second spring 42 is not tightened. Therefore, the elastic force of only the first spring 32 is applied to the rope 37 via the first spring case 32A and the rope winding pulley 33. In this way, the load can be switched by making the switching gear 55 either non-rotatable or rotatable using the load switching unit 50.

[0054] The link plate 52 and the selector lever 53 are connected via a selector spring 54. When the projection 53C is engaged with the selector gear 55 to make the selector gear 55 and the second shaft 70 unable to rotate, there is play in the connection between the link plate 52 and the selector lever 53, but the selector spring 54 ensures that the projection 53C is always engaged with the selector gear 55.

[0055] When the switching gear 55 is made immobile, even if the projection 53C and the switching gear 55 ride up on each other, the play described above can absorb this riding up state, and the biasing force of the switching spring 54 causes the switching gear 55 to rotate slightly, so that the projection 53C properly engages with the switching gear 55.

[0056] As described above, when the projection 53C is engaged with the switching gear 55 and the switching gear 55 attempts to rotate counterclockwise in Figure 15, the switching lever 53 receives a force that attempts to rotate clockwise around the rotation axis 53A due to the positional relationship between the contact surface between the switching gear 55 and the projection 53C and the rotation axis 53A. Therefore, the engagement between the projection 53C and the switching gear 55 does not disengage, and the counterclockwise rotation of the switching gear 55 is restricted. On the other hand, when the switching gear 55 is in a rotatable state and the rope 37 is pulled out, and the load switching unit 50 switches the switching gear 55 from a rotatable state to a non-rotatable state, so that the rope 37 is wound onto the rope winding pulley 33 by the biasing force of the first mainspring 32, the second mainspring case 43 rotates clockwise, and therefore the switching gear 55 also rotates clockwise in Figure 15.

[0057] As a result, the second mainspring 42 will be wound in the reverse direction, and the second mainspring 42 may be damaged. When the switching gear 55 rotates clockwise in Figure 15, the projection 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 it counterclockwise around the rotation axis 53A. When the switching lever 53 receives a force that tries to rotate it counterclockwise around the rotation axis 53A, the play in the connection between the link plate 52 and the switching lever 53 and the switching spring 54 cause it to disengage from the switching gear 55. In other words, the switching gear 55 is configured to function as a one-way gear. As a result, the second mainspring 42 is prevented from being wound in the reverse direction, and damage to the second mainspring 42 can be prevented.

[0058] Figure 17 shows the emergency stop unit 60 shown in Figure 13, where (a) is a plan view of the emergency stop unit 60 in a non-stopping state and (b) is a plan view of the emergency stop unit 60 in a stopped state. Figure 18 is a perspective view of the rotating unit 61 shown in Figure 17. Figure 19 is a partial cross-sectional view of the rotating unit 61 shown in Figure 18. Figure 20 is a perspective view of the stopper unit 62 shown in Figure 17. As shown in Figure 13, the emergency stop unit 60 is provided below the load increasing unit 40.

[0059] As shown in Figure 17, the emergency stop unit 60 comprises a rotating unit 61 and a stopper unit 62. As shown in Figures 17 and 18, the rotating unit 61 has a centrifugal base 63, two guide pins 64, two protruding pins 65, and two centrifugal springs 66. The centrifugal base 63 is substantially disc-shaped and fixed to the lower side of the second gear 44. The centrifugal base 63 rotates integrally with the second gear 44. The second shaft 70 passes through the center of the centrifugal base 63. Slits 63a are formed in the centrifugal base 63 at positions opposite each other with respect to the center. Cylindrical guide pins 64 are provided in each slit 63a so as to protrude outward.

[0060] Each projection pin 65 is made of metal, has a cylindrical shape, and is slidably mounted on the outer circumference of the guide pin 64. As shown in Figures 18 and 19, the projection pins 65 are covered with resin. Each centrifugal spring 66 has one end connected to the centrifugal base 63 and the other end connected to the guide pin 64. Each centrifugal spring 66 pulls the guide pin 64 toward the center of the centrifugal base 63. As shown in Figure 17(a), in the non-stopping emergency stop section 60, the outer end of each projection pin 65 is located inward from the outer surface of the centrifugal base 63 due to the tensile force of each centrifugal spring 66.

[0061] As shown in Figures 17 and 20, the stopper portion 62 has a support portion 67, an impact portion 68, and an impact absorbing material 69. The support portion 67 is fixed to the base portion 31A and has an impacted portion 67A that runs along a part of the outer circumference of the centrifugal base 63. The impacted portion 67A has a groove 67b that extends along the circumferential direction of the centrifugal base 63. The impact portion 68 and the impact absorbing material 69 are provided on the impacted portion 67A, aligned along the circumferential direction of the centrifugal base 63. The impact absorbing material 69 is made of an elastic material. Therefore, the impact absorbing material 69 is configured to return to its original shape even if it is crushed by the impact portion 68. An impact pin 68A is fixed to the impact portion 68, and the impact pin 68A is inserted into the groove 67b of the impacted portion 67A.

[0062] If the user accidentally releases the grip attached to the grip mounting portion 37D, the rope 37 is wound onto the rope winding pulley 33 at high speed. The first gear 41, fixed to the rope winding pulley 33 via the first spring case 32A, and the second gear 44, which meshes with the first gear 41, rotate clockwise at high speed in Figure 12. Consequently, the centrifugal base 63 fixed to the second gear 44 also rotates clockwise at high speed in Figure 17. As a result, a centrifugal force greater than the tensile force of each centrifugal spring 66 acts on each protruding pin 65, and each protruding pin 65 protrudes outward from the outer surface of the centrifugal base 63, as shown in Figure 17(b). The protruding pins 65 collide with the collision portion 68 of the stopper portion 62. The collision of the protruding pins 65 causes the collision portion 68 to slide toward the shock absorber 69, and the shock absorber 69 absorbs the impact.

[0063] As a result, the rotation of the centrifugal base 63 stops, the rotation of the second gear 44 to which the centrifugal base 63 is fixed stops, the rotation of the first gear 41 which meshes with the second gear 44 stops, the rotation of the rope winding pulley 33 stops, and the action of pulling back the rope 37 stops. With the protruding pin 65 protruding from the centrifugal base 63 and in contact with the collision portion 68 of the stopper portion 62, pulling out the rope 37 slightly causes the protruding pin 65 to return to its original position by the force of the centrifugal spring 66.

[0064] The muscle training device 101 comprises a base portion 31A, a first spring 32 and a second spring 42 provided on the base portion 31A, and a rope 37 having a first end 37A connected to the first spring 32 and a second end 37B located on the opposite side of the first end 37A. The first spring 32 and the second spring 42 are configured to impart an elastic force to the rope 37 that resists tensile force when the second end 37B is pulled. With this configuration, the load on the user in the muscle training device 101 can be increased by the first spring 32 and the second spring 42.

[0065] The muscle training device 101 further includes a load switching unit 50 that can be switched to generate an elastic force that resists tensile force in either the first mainspring 32 only, or in both the first mainspring 32 and the second mainspring 42. The load switching unit 50 has a switching lever 53 and a switching gear 55. The switching gear 55 is fixed to the second shaft 70 to which the center 42A of the second mainspring 42 is fixed. When the switching lever 53 engages with the switching gear 55, the switching gear 55 becomes immobile, and the center 42A of the second mainspring 42 becomes immobile, making the second mainspring 42 able to be wound up. Alternatively, when the switching lever 53 disengages from the switching gear 55, the switching gear 55 becomes rotatable, and the center 42A of the second mainspring 42 becomes rotatable together with the second shaft 70, making the second mainspring 42 unable to be wound up.

[0066] The muscle training device 101 has the same effect as the muscle training device 1. Furthermore, the above configuration of the switching lever 53 and switching gear 55 allows the load to be switched according to the user's needs, improving the usability of the muscle training device 101.

[0067] The muscle training device 101 further includes an emergency stop unit 60 that stops the rope 37 from being pulled back when the rope 37 is pulled back by the elastic force generated in the first spring 32 and the second spring 42 and applied to the rope 37, even when no user force is acting on it. The emergency stop unit 60 includes a rotating unit 61 that rotates by elastic force and a stopper unit 62 that stops the rotation of the rotating unit 61. The rotating unit 61 has a protruding pin 65 that protrudes outward from the rotating unit 61 due to rotation by elastic force. The stopper unit 62 is configured to stop the rotation of the rotating unit 61 and prevent the rope 37 from being pulled back by the protruding pin 65 that protrudes outward from the rotating unit 61 colliding with it.

[0068] This configuration allows the rope 37 to stop being wound up when the user releases their hand from the grip attached to the grip mounting part 37D, thereby preventing damage to the main body 130 of the muscle training device 101.

[0069] The technologies disclosed herein are not limited to the embodiments described above and can be modified in various forms without departing from their essence, for example, the following modifications are possible.

[0070] The flat plate 10 may be foldable. The main bodies 30 and 130 are provided at the corners 15 and 16 of the flat plate 10, but they may also be provided in a location other than the corners 15 and 16, for example, in the center of the flat plate 10, so as to be attachable and detachable. The flat plate 10 was substantially rectangular in plan view, but it may have other shapes, such as a trapezoid. In the second embodiment, two spring coils 32 and 42 were provided inside the main body 130, but the number of spring coils may be increased to create a configuration with even higher load. The emergency stop unit 60 was provided below the load increase unit 40, but it may also be provided below the rope winding pulley 33, or it may be provided on the main body 30 of the muscle training device 1 in the first embodiment. [Explanation of Symbols]

[0071] 1.101 Muscle Training Device 10 flat plate 10a Pin insertion hole, 10B Top surface 11 First side, 12 Second side, 13 Third side, 14 Fourth side 15 1st corner, 16 2nd corner, 17 3rd corner, 18 4th corner 19 Handle 20 Mounting part 21 Fixing part, 22, First plate, 22a Gap 30, 130 main unit 31 cabinets 31A Base section, 31B Cover section, 31C Bottom surface, 31D Second plate 31e Gap, 31F Opening 32. First mainspring 32A Mainspring case, 32B First shaft, 32C Center 32D outer end 33 Pulley 33a groove, 33B wall 34 Guide rollers 34A Roller Shaft 35. Pull-out pulley 36A, 36B, 36C Drawer Rollers 37 Rope 37A First end, 37B Second end, 37C Connection part, 37D Grip mounting section 38 Fixed part 38A Lock switch, 38B Lock pin, 38C Lock spring 40 Load increase section 41 First Gear 42. Second mainspring 42A center, 42B outer edge 42. Second mainspring 43. Second spring case 44. Second gear 50 Load switching section 51 Push latch 51A Support base, 51B Latch case, 51C Pressing and moving part 52 Link Board 52A Shaft 53. Switching lever 53A Rotating shaft, 53b Groove, 53C Projection 54 Switching spring 55 gear selection 60 Emergency stop section 61 Rotating part 63 Centrifugal base, 63a Slit, 64 Guide pin, 65 Projection pin 62 Stopper part 67 Support part 67A Collision area, 67b Groove 68 Collision part 68A Collision pin 69 Shock absorber 70 Second shaft

Claims

1. 1. A muscle training device comprising: a flat plate on which a user stands; a body that is attachable to and detachable from the flat plate; The body includes: A base portion; An elastic body provided on the base portion; a string having a first end connected to the elastic body and a second end located opposite the first end, The elastic body is configured to impart an elastic force to the string that resists a tensile force when the second end is pulled, The main body is provided in two pieces, The flat plate has a side portion extending in a predetermined direction, A muscle training device in which the two main bodies are attached and detachably provided at both ends of the side portion, respectively, and the area of ​​the flat plate other than the both ends of the side portion is an area on which a user can stand.

2. the flat plate includes a mounting portion to which the main body is attached, the mounting portion has a first plate provided with a gap between it and a surface of the flat plate, the main body has a second plate provided on a lower surface side of the base portion with a gap between the second plate and the lower surface, 2. The muscle training device of claim 1, wherein the second plate of the body is inserted under the first plate by sliding the body relative to the mounting portion of the flat plate, thereby preventing the body from moving away from the mounting portion.

3. The muscle training device of claim 2 , wherein the second plate of the body is configured to slide under the first plate by rotating the body.

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