KR20230054088A - Strength exercise apparatus based on eddy current and flywheel - Google Patents

Abstract

Muscular exercise device based on eddy current and flywheel includes a frame, a rotational shaft rotatably provided on the frame, a flywheel provided on the rotational shaft and generating a moment of inertia according to the rotation of the rotational shaft, and winding on the rotational shaft by pulling or releasing operation A strap that is released or wound to rotate the rotating shaft, and a brake provided on the rotating shaft to provide rotational resistance of the rotating shaft, wherein the strap is provided between the flywheel and the brake, and the brake comprises the rotating shaft. It may include a rotating conductor member, and a magnetic member that generates magnetic force and is disposed adjacent to the conductor member to decelerate the torque of the conductor member by eddy current when the conductor member rotates.

Description

Muscular exercise device based on eddy current and flywheel {STRENGTH EXERCISE APPARATUS BASED ON EDDY CURRENT AND FLYWHEEL}

The present invention relates to a muscle strength exercise device using eddy current and a flywheel.

In general, strength training devices are designed to be suitable for training specific muscles. Therefore, in order to strengthen muscles of the upper body, lower body, and various parts, a large number of strength training devices should be provided.

A conventional muscular exercise device includes a rotating shaft, a strap that is unwound or wound around the rotating shaft by a user's pulling or unwinding operation, and rotates the rotating shaft, and a flywheel provided on the rotating shaft. At this time, during the user's pulling operation Concentric contraction occurs, and eccentric contraction occurs when the user releases the pull. Here, the concentric contraction is muscle strength generated as the length of the muscle is shortened, and the eccentric contraction is muscle strength generated as the length of the muscle is lengthened.

The flywheel generates a moment of inertia according to the rotation of the rotating shaft. Therefore, when the rotary shaft rotates positively by the user's pulling motion, the moment of inertia of the rotary shaft increases by the flywheel, thereby making forward rotation of the rotary shaft easier, and a small resistance is applied to the user's concentric contraction. On the other hand, when the rotating shaft reversely rotates by the user's pull-release operation, the moment of inertia of the rotating shaft by the flywheel decreases, and as a result, the reverse rotation of the rotating shaft becomes difficult, so that a large resistance is applied to the user's eccentric contraction. all.

That is, in the conventional muscle exercise device, a small resistance is applied to the concentric contraction during the user's pulling operation by the flywheel, but a large resistance is applied to the eccentric contraction during the user's pulling-release operation, so due to this deviation, the user's injury There was a problem caused by this.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide resistance to the user's concentric contraction during the user's pulling operation and resistance to the user's eccentric contraction during the user's pulling-release operation. It is an object of the present invention to provide a strength training device capable of preventing a user's injury by reducing the deviation between the liver.

A muscle strength exercise device according to an embodiment of the present invention includes a frame; a rotation shaft rotatably provided to the frame; a flywheel provided on the rotating shaft and generating a moment of inertia according to rotation of the rotating shaft; a strap that is unwound or wound around the rotational shaft by a pulling or unwinding operation to rotate the rotational shaft; and a brake provided on the rotating shaft to provide rotational resistance of the rotating shaft.

In addition, the strap may be provided between the flywheel and the brake.

In addition, the brake includes a conductor member provided on the rotating shaft and rotating; and a magnetic member that generates magnetic force and is disposed adjacent to the conductor member to decelerate the torque of the conductor member by eddy current when the conductor member rotates. can include

In addition, the magnetic member may include one or more permanent magnets.

In addition, the magnetic member may include one or more electromagnets.

In addition, the thickness measuring unit for measuring the winding thickness of the strap on the rotating shaft; and a power supply unit for applying a current to the electromagnet when the measured value of the thickness measuring unit decreases or not applying a current to the electromagnet when the measured value of the thickness measuring unit increases.

In addition, when the measured value of the thickness measuring unit decreases, the power applying unit may adjust the strength of applying the current to the electromagnet.

In addition, a bobbin provided on the rotating shaft, on which the strap is wound or unwound; a flywheel cover through which one side of the rotating shaft passes and covers the flywheel; a flywheel auxiliary cover through which one side of the rotating shaft passes and coupled to the flywheel cover with the flywheel interposed therebetween; a conductor member cover through which the other side of the rotating shaft passes, covering the conductor member; and a conductor member auxiliary cover through which the other side of the rotating shaft passes and coupled to the conductor member cover with the conductor member interposed therebetween, wherein the magnetic member may be coupled to the conductor member cover or the conductor member auxiliary cover. .

In addition, a first reinforcing member made of steel provided on the opposite surface of the flywheel cover facing the strap; and a second reinforcing member made of steel provided on an opposite surface of the conductor member cover facing the strap.

In addition, a first mounter inserted into one end of the rotating shaft and supporting the flywheel; a first spring that surrounds an outer circumferential surface of the first mounter and generates an elastic force that presses the first mounter; a second mounter inserted into the other end of the rotating shaft and supporting the conductor member; and a second spring that surrounds an outer circumferential surface of the second mounter and generates an elastic force pressing the second mounter.

In addition, a torque calculation unit for calculating the torque of the rotating shaft according to the measured value measured by the thickness measuring unit; a communication module for transmitting the torque data calculated by the torque calculator to a user terminal; a user terminal for storing data transmitted from the communication module; and artificial intelligence that performs deep learning on the data stored in the user terminal, compares the concentric contraction torque value by the user's pulling motion and the eccentric contraction torque value by the user's pulling-release motion, and calculates the muscle strength for each exercise posture of the user. An intelligent neural network may be further included.

In addition, a handle coupled to the distal end of the strap may be further included.

A muscle exercise device according to an embodiment of the present invention reduces the deviation between resistance generated in concentric contraction during a user's pulling operation and resistance generated in eccentric contraction during a user's pulling-release operation, thereby preventing injury to the user. There are effects that can be done.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a perspective view showing a strength exercise device according to an embodiment of the present invention.
2 is an exploded perspective view showing a flywheel cover, a flywheel, and a flywheel auxiliary cover of a strength training device according to an embodiment of the present invention.
3 is an exploded perspective view showing a conductor member cover, a brake, and an auxiliary conductor member cover of a muscle strength exercise device according to an embodiment of the present invention.
4 is a cross-sectional view showing a strength exercise device according to an embodiment of the present invention.
5 and 6 are schematic diagrams showing concentric contraction and eccentric contraction using the muscle strength exercise device according to an embodiment of the present invention.
7 to 8 are internal views showing the thickness measuring unit of the strength exercise device according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only these embodiments are intended to complete the disclosure of the present invention, and are common in the art to which the present invention belongs. It is provided to fully inform the person skilled in the art of the scope of the invention, and the invention is only defined by the scope of the claims.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, the singular form is specifically used in a phrase.

Also includes plural unless otherwise stated. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements. Like reference numerals throughout the specification refer to like elements, and “and/or” includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

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

1 is a perspective view showing a strength exercise device according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a flywheel cover, a flywheel, and a flywheel auxiliary cover of the strength exercise device according to an embodiment of the present invention, FIG. is an exploded perspective view showing a conductor member cover, a brake, and a conductor member auxiliary cover of a muscle strength exercise device according to an embodiment of the present invention, Figure 4 is a cross-sectional view showing a strength exercise device according to an embodiment of the present invention, Figure 5 to FIG. 6 are schematic diagrams showing concentric contraction and eccentric contraction using the strength training apparatus according to an embodiment of the present invention.

As shown in Figures 1 to 4, the strength exercise device according to an embodiment of the present invention includes a frame 200, a rotating shaft 300, a flywheel 400, a strap 500 and a brake 600. .

The frame 200 serves to form the basic body of the present invention. The frame 200 may be formed in a disk shape as a whole.

A flywheel cover 220 and a flywheel auxiliary cover 230 may be provided on one side of the frame 200 along a direction away from the center of the frame 200 . Subsequently, a conductor member cover 240 and an auxiliary conductor member cover 250 may be provided on the other side of the frame 200 along a direction away from the center of the frame 200 . The frame 200 may be accommodated in the base 100 .

The base 100 may have a pair of footrests. Therefore, the user can hold the handle 700 with both hands, pull or release the strap 500, and perform strength training while supporting both feet on a pair of footrests of the base 100 in a sitting position. there is. In addition, in a standing position, the user holds the handle 700 with both hands, pulls or releases the strap 500, and performs strength training in a state where both feet are placed on a pair of footrests of the base 100. can

A flywheel 400 to be described later is accommodated between the flywheel cover 220 and the flywheel auxiliary cover 230.

One side of the rotation shaft 300 passes through the flywheel cover 220 and covers one side of the flywheel 400 . A first bearing 280 may be provided between the inner circumferential surface of the flywheel cover 220 and the outer circumferential surface of the rotary shaft 300 to smoothly rotate the rotary shaft 300 .

The flywheel cover 220 may be disposed adjacent to one side of the bobbin 301. At this time, the flywheel cover 220 may be worn due to friction with the strap 500 wound or unwound on the bobbin 301. can To prevent this, a first reinforcing member 260 made of steel may be provided on the opposite surface of the flywheel cover 220 facing the strap 500 .

The first reinforcing member 260 may be formed to cover only a partial area where friction with the strap 500 may occur on the opposite surface of the flywheel cover 220 facing the strap 500 . For example, the first reinforcing member 260 may be formed in a fan shape.

The flywheel auxiliary cover 230 has one side of the rotating shaft 300 penetrated, is coupled to the flywheel cover 220 with the flywheel 400 therebetween, and covers the other side of the flywheel 400.

A first mounter 910 and a first spring 920 may be provided between the inner circumferential surface of the flywheel auxiliary cover 230 and the outer circumferential surface of the rotating shaft 300, which will be described later.

A conductor member 610 to be described later is accommodated between the conductor member cover 240 and the conductor member auxiliary cover 250 . In addition, a magnetic member 620 to be described later may be coupled to the conductor member cover 240 or the conductor member auxiliary cover 250 .

The other side of the rotating shaft 300 passes through the conductor member cover 240 and covers one side of the conductor member 610 . A second bearing 290 may be provided between the inner circumferential surface of the conductor member cover 240 and the outer circumferential surface of the rotary shaft 300 to smoothly rotate the rotary shaft 300 .

The conductor member cover 240 may be disposed adjacent to the other side of the bobbin 301, and wear may occur on the conductor member cover 240 due to friction with the strap 500 wound or unwound on the bobbin 301. there is. To prevent this, a second reinforcing member 270 made of steel may be provided on the opposite surface of the conductor member cover 240 facing the strap 500.

The second reinforcing member 270 may be formed to cover only a partial area where friction with the strap 500 may occur on the opposite surface of the conductor member cover 240 facing the strap 500 . For example, the second reinforcing member 270 may be formed in a fan shape.

The conductor member auxiliary cover 250 has the other side of the rotating shaft 300 penetrated, is coupled to the conductor member cover 240 with the conductor member 610 therebetween, and covers the other side of the conductor member 610.

A second mounter 940 and a second spring 950 may be provided between the inner circumferential surface of the conductor member auxiliary cover 250 and the outer circumferential surface of the rotating shaft 300, which will be described later.

Meanwhile, the flywheel auxiliary cover 230, the flywheel cover 220, the first reinforcing member 260, the second reinforcing member 270, the conductor member cover 240, and the conductor member auxiliary cover 250 are connectors 210 It can be mutually detachably coupled by. Specifically, the connector 210 includes a flywheel auxiliary cover 230, a flywheel cover 220, a first reinforcing member 260, a second reinforcing member 270, a conductor member cover 240, and a conductor member auxiliary cover 250 ) can be sequentially penetrated, respectively.

The rotating shaft 300 is rotatably provided on the frame 200 . The rotating shaft 300 is attached to the flywheel auxiliary cover 230, the flywheel cover 220, the first reinforcing member 260, the second reinforcing member 270, the conductor member cover 240, and the conductor member auxiliary cover 250. can be passed sequentially.

A bobbin 301 on which the strap 500 is unwound or wound may be provided at the center of the rotating shaft 300 . When the bobbin 301 is rotated by unwinding or winding the strap 500, the rotating shaft 300 may also be rotated. The bobbin 301 may be formed in the shape of a long ball having a central diameter smaller than both end diameters.

The flywheel 400 is provided on one side of the rotating shaft 300 and generates a moment of inertia according to the rotation of the rotating shaft 300 .

The flywheel 400 is fixed to one side of the rotation shaft 300, and when the rotation shaft 300 rotates, the flywheel 400 may also rotate. For example, a polygonal first fixing hole 410 is provided in the flywheel 400, and a first fixing bar 310 corresponding to the first fixing hole 410 is formed on one side of the rotating shaft 300. As the first fixing bar 310 of the rotating shaft 300 is fixed to the first fixing hole 410 of the flywheel 400, the flywheel 400 can also rotate when the rotating shaft 300 rotates.

As described above, the flywheel 400 is accommodated between the flywheel cover 220 and the flywheel auxiliary cover 230 that are detachably coupled to each other. Therefore, by simply separating the flywheel cover 220 and the flywheel auxiliary cover 230, the flywheel 400 can be easily replaced. Therefore, the user can easily apply and replace flywheels 400 of various diameters and sizes.

The strap 500 may be unwound or wound around the rotational shaft 300 by a user's pulling or unwinding operation, thereby rotating the rotational shaft 300 .

One end of the strap 500 may be coupled to the bobbin 301 , and the other end of the strap 500 may be coupled to the handle 700 . Here, the handle 700 may be formed in a bar shape, and the other end of the strap 500 may be coupled to the center of the handle 700 .

The strap 500 may be provided between the flywheel 400 and the brake 600, and may be wound around the bobbin 301 between the flywheel 400 and the brake 600, for example.

On the other hand, when the user pulls the strap 500, as shown in FIG. 5, concentric contraction, which is muscle strength generated as the length of the user's muscles shortens, may occur.

In addition, when the user's strap 500 is pulled apart, as shown in FIG. 6 , eccentric contraction, which is muscle strength generated as the length of the user's muscles increases, may occur.

The brake 600 is provided on the rotating shaft 300 and serves to provide rotational resistance of the rotating shaft 300 . Therefore, when the rotary shaft 300 is rotated positively by the user's pulling motion of the strap 500, the moment of inertia of the rotary shaft 300 is increased by the flywheel 400, thereby making forward rotation of the rotary shaft 300 easy. However, as the brake 600 provides rotational resistance to the rotating shaft 300, great resistance may be applied to the user's concentric contraction.

In addition, when the rotating shaft 300 rotates reversely by the user's pulling release operation of the strap 500, the brake 600 provides a very small rotational resistance to the rotating shaft 300, but the rotational shaft ( 300) decreases, and as a result, reverse rotation of the rotating shaft 300 becomes difficult, and a large resistance is applied to the extensibility contraction of the user.

As a result, the user's injury can be prevented by reducing the deviation between the resistance generated in concentric contraction during the user's pulling operation and the resistance generated in the eccentric contraction during the user's pulling-release operation.

Hereinafter, the brake 600 will be described in detail.

The brake 600 may include a conductor member 610 and a magnetic member 620.

The conductor member 610 may be provided on the other side of the rotating shaft 300 and rotate.

The conductor member 610 is fixed to the other side of the rotation shaft 300, and when the rotation shaft 300 rotates, the conductor member 610 may also rotate. For example, a polygonal second fixing hole 611 is provided in the conductor member 610, and a second fixing bar 320 corresponding to the second fixing hole 611 is formed on the other side of the rotating shaft 300. And, as the second fixing bar 320 of the rotary shaft 300 is fixed to the second fixing hole 611 of the conductor member 610, when the rotary shaft 300 rotates, the conductor member 610 also rotates. can

As described above, the conductor member 610 is accommodated between the conductor member cover 240 and the conductor member auxiliary cover 250 that are detachably coupled to each other. Therefore, by simply separating the conductor member cover 240 and the auxiliary conductor member cover 250, the conductor member 610 can be easily replaced. Therefore, the user can easily apply and replace the conductor member 610 of various diameters and sizes.

The magnetic member 620 generates magnetic force and is disposed adjacent to the conductor member 610 to reduce the torque of the conductor member 610 by eddy current when the conductor member 610 rotates. Specifically, the magnetic member 620 may form a magnetic field, and the magnetic field may form eddy currents in the conductor member 610 . At this time, as the magnetic flux generated by the magnetic member 620 and the magnetic flux generated by the conductor member 610 are in opposite directions according to Lenz's law, when the conductor member 610 rotates, the conductor member 610 of torque can be reduced. Meanwhile, if the torque of the conductor member 610 is reduced, the torque of the rotating shaft 300 coupled with the conductor member 610 will also be reduced.

The magnetic member 620 may be coupled to the conductor member cover 240 or the conductor member auxiliary cover 250 .

For example, the magnetic member 620 may include one or more permanent magnets.

Here, as the number of permanent magnets is installed, the intensity of eddy current formed in the conductor member 610 by the permanent magnets increases, and thus the torque deceleration effect of the conductor member 610 may increase. In addition, as the number of permanent magnets installed decreases, the intensity of eddy current formed in the conductor member 610 by the permanent magnets decreases, and thus the torque deceleration effect of the conductor member 610 may decrease.

As another example, the magnetic member 620 may include one or more electromagnets.

Here, as the strength of the current applied to the electromagnet increases, the strength of the eddy current formed in the conductor member 610 by the electromagnet increases, and thus the torque deceleration effect of the conductor member 610 may increase. In addition, as the intensity of the current applied to the electromagnet decreases and the intensity of the eddy current formed in the conductor member 610 by the electromagnet decreases, the torque deceleration effect of the conductor member 610 may decrease.

Here, the strength of the current applied to the electromagnet may be determined by the thickness measurement unit 800 and the power supply unit to be described later.

7 to 8 are internal views showing the thickness measuring unit 800 of the strength exercise device according to an embodiment of the present invention.

As shown in FIGS. 7 to 8 , the thickness measurement unit 800 measures the winding thickness of the strap 500 on the rotation shaft 300 . Here, when the measured value of the thickness measurement unit 800 decreases, as shown in FIG. 7 , the rotation shaft 300 is rotated forward by the user's pulling operation of the strap 500, and the strap 500 is moved along the rotation shaft. This is the case where winding is released at 300. In addition, when the measured value of the thickness measurement unit 800 increases, as shown in FIG. 8 , the rotation shaft 300 reversely rotates by the user's release of the strap 500, and the strap 500 rotates the rotation shaft. This is the case when it is wound around (300).

The thickness measuring unit 800 may be an optical sensor provided on the conductor member cover 240, and the present invention is not particularly limited thereto.

The power application unit (not shown) may apply current to the electromagnet when the measured value of the thickness measuring unit 800 decreases, or may not apply current to the electromagnet when the measured value of the thickness measuring unit 800 increases.

In other words, when the measured value of the thickness measurement unit 800 decreases, when the power supply unit applies a current to the electromagnet, the conductor member 610 and the rotating shaft 300 are formed by the eddy current formed in the conductor member 610 by the electromagnet. As the torque of is reduced, rotational resistance may be applied to the rotating shaft 300 .

In addition, when the measured value of the thickness measurement unit 800 decreases, if the power supply unit does not apply current to the electromagnet, the torque between the conductor member 610 and the rotating shaft 300 is maintained, and the rotational resistance of the rotating shaft 300 this will not be affected.

On the other hand, when the measured value of the thickness measuring unit 800 decreases, the power applying unit may adjust the strength of applying the current to the electromagnet.

For example, the power applying unit may increase the strength of applying current to the electromagnet as the measured value of the thickness measurement unit 800 decreases. In this case, as the length at which the strap 500 is unwound from the rotating shaft 300 increases, the strength of the eddy current formed by the electromagnet in the conductor member 610 increases, so the rotational resistance applied to the rotating shaft 300 by the electromagnet increases. It gets bigger. As a result, as the length of the strap 500 being unwound from the rotating shaft 300 becomes longer, the user must pull the strap 500 with a relatively greater force so that the strap 500 can be unwound from the rotating shaft 300. .

Meanwhile, the strength exercise device according to an embodiment of the present invention may further include a first mounter 910, a first spring 920, a second mounter 940, and a second spring 950.

The first mounter 910 is fitted to one end of the rotating shaft 300 and supports the flywheel 400. The first mounter 910 may be formed in a cylindrical shape.

Meanwhile, the first mounter 910 may pass through the flywheel auxiliary cover 230 . Here, a first cap 930 may be provided on an outer circumferential surface of the first mounter 910 . The outer circumferential surface of the first cap 930 may be knurled. Here, the first cap 930 may be used as a knob for a user to rotate the rotary shaft 210 .

The first spring 920 surrounds the outer circumferential surface of the first mounter 910 and can press the first mounter 910 . Accordingly, separation of the first mounter 910 from the rotation shaft 300 can be prevented by the elastic force of the first spring 920 . For example, a wave type wave spring may be used as the first spring 920, but the present invention is not limited thereto.

The second mounter 940 is inserted into the other end of the rotating shaft 300 and supports the flywheel 400. The second mounter 940 may be formed in a cylindrical shape.

Meanwhile, the second mounter 940 may pass through the conductor member auxiliary cover 250 . Here, a second cap 960 may be provided on an outer circumferential surface of the second mounter 940 . The outer circumferential surface of the second cap 960 may be knurled. Here, the second cap 960 may also be used as a knob for a user to rotate the rotary shaft 210 .

The second spring 950 surrounds the outer circumferential surface of the second mounter 940 and can pressurize the second mounter 940 . Accordingly, separation of the second mounter 940 from the rotation shaft 300 can be prevented by the elastic force of the second spring 950 . For example, a wave type wave spring may be used as the second spring 950, but the present invention is not limited thereto.

Meanwhile, the muscle strength exercise device according to an embodiment of the present invention may further include a torque calculator (not shown), a communication module (not shown), and an artificial intelligence neural network (not shown).

The torque calculation unit may calculate the torque of the rotating shaft 300 according to the measured value measured by the thickness measuring unit 800, that is, the rate of change of the winding thickness of the strap 500 on the rotating shaft 300. For example, a microcomputer may be used as the torque calculator.

The communication module may transmit the data calculated by the torque calculation unit to the user terminal. This communication module can transmit the data calculated by the torque calculation unit to the user terminal in a Bluetooth, IOT module, or WIFI method.

The user terminal stores data transmitted from the communication module.

The artificial intelligence neural network can be provided as a hardware or application in a user terminal, and deep-learns data stored in the user terminal, and through this, the contraction torque value of contraction by the user's pulling motion and the extensibility by the user's pulling-release motion The contraction torque values may be compared, and muscle strength for each exercise posture of the user may be calculated, and transmitted to the user's terminal through the communication module. Here, the user will be able to share the user's muscle strength data for each exercise posture through the user terminal through the SNS.

Although not shown in the drawing, the frame 200 may be provided with a self-generated generator that self-generates by the rotation of the rotating shaft 300 and a portable battery that stores self-generated power by the self-generator.

Hereinafter, an operation example of the present invention will be described.

First, as shown in FIGS. 5 and 7 , the user pulls the strap 500 . At this time, when the user pulls the strap 500, concentric contraction occurs in the user's muscles.

Next, as the strap 500 is unwound from the rotating shaft 300 by the user pulling the strap 500, the rotating shaft 300 rotates in the forward direction. At this time, as the moment of inertia of the rotation shaft 300 of the flywheel 400 increases, forward rotation of the rotation shaft 300 can be facilitated. However, the brake 600 provides rotational resistance to the rotating shaft 300 . For example, when the brake 600 is composed of a permanent magnet and a conductor member 610, as the permanent magnet forms an eddy current in the conductor member 610, the rotational resistance to the rotating shaft 300 connected to the conductor member 610 can provide. As another example, when the brake 600 is composed of an electromagnet and a conductor member 610, as the electromagnet to which power is applied by the power supply unit forms an eddy current in the conductor member 610, the conductor member 610 and the connected Rotation resistance may be provided to the rotation shaft 300 . As a result of the brake 600 providing rotational resistance of the rotating shaft 300, a large resistance is applied to the user's concentric contraction during the user's pulling operation.

Then, as shown in FIGS. 6 and 8 , the user pulls off the strap 500 . At this time, when the user releases the pull, elastic contraction occurs in the user's muscles.

Next, as the strap 500 is wound around the rotating shaft 300 by pulling off the strap 500 by the user, the rotating shaft 300 rotates in the reverse direction. At this time, as the flywheel 400 reduces the moment of inertia of the rotating shaft 300, reverse rotation of the rotating shaft 300 becomes difficult. As a result of this difficulty in reverse rotation of the rotating shaft 300, a large resistance is applied to the user's concentric contraction during the user's pulling-release operation.

As a result, the muscle strength exercise device according to an embodiment of the present invention reduces the deviation between the resistance generated in the concentric contraction during the user's pulling operation and the resistance generated in the eccentric contraction during the user's pulling-release operation, thereby injuring the user. has the effect of preventing

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: base
200: frame
210: connector
220: flywheel cover
230: flywheel auxiliary cover
240: conductor member cover
250: conductor member auxiliary cover
260: first reinforcing member
270: second reinforcing member
280: first bearing
290: second bearing
300: axis of rotation
301: bobbin
310: first fixing bar
320: second fixing bar
400: flywheel
410: first fixing hole
500: strap
600: brake
610: conductor member
611: second fixing hole
620: magnetic member
700: handle
800: thickness measuring unit
910: first mounter
920: first spring
930: first cap
940: second mounter
950: second spring
960: second cap

Claims (1)

frame;
a rotation shaft rotatably provided to the frame;
a flywheel provided on the rotating shaft and generating a moment of inertia according to rotation of the rotating shaft;
a strap that is unwound or wound around the rotational shaft by a pulling or unwinding operation to rotate the rotational shaft; and
A brake provided on the rotating shaft to provide rotational resistance of the rotating shaft;
The strap is provided between the flywheel and the brake,
the brake,
a conductor member provided on the rotating shaft to rotate; and
A magnetic member generating magnetic force and disposed adjacent to the conductor member to decelerate the torque of the conductor member by an eddy current when the conductor member rotates, wherein the magnetic member includes one or more permanent magnets. and a strength training device based on a flywheel.

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