MUSCLE STRENGTH AID DEVICE

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to Korean Patent Application No. 10-2024-0163475, filed in the Korean Intellectual Property Office on Nov. 15, 2024, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a muscle strength aid device.

BACKGROUND

One example of a device that aids muscle strength of a person during his or her operation of a muscle is an upper arm muscle strength aid device that is installed on an arm to aid muscle strength. In the case of an upper arm muscle strength aid device, a mechanism that forms a torque for assisting a load due to the weight of the arm and the weight of an object that the arm is supporting is mounted. For example, in the case of the upper arm muscle strength aid device, a different magnitude of torque is generated depending on the rotation angle of the device, which has a functional relationship in which the magnitude of the torque is determined by the rotation angle. This functional relationship is called a torque profile.

Meanwhile, the magnitude of the torque required for the muscle strength aid device is different depending on the type of an operation that the person performs. For example, even when the rotation angle of the upper arm muscle strength aid device is the same, a degree of the load applied to the person varies depending on the type of an operation that the person performs. Therefore, when the type of the operation performed by the person is changed, a torque profile required for the upper arm muscle strength aid device also needs to be changed.

Accordingly, the need for a muscle strength aid device that may easily manipulate the torque profile and fix the torque profile depending on the user or the user's operation type is increasing.

SUMMARY

The present disclosure has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact.

An aspect of the present disclosure provides a muscle strength aid device that may easily change and fix a torque profile.

The technical problems to be solved by the present disclosure are not limited to the aforementioned problems, and any other technical problems not mentioned herein will be clearly understood from the following description by those skilled in the art to which the present disclosure pertains.

According to an aspect of the present disclosure, a muscle strength aid device includes a multi-link part including one or more links, an elastic force providing part coupled to one side of the multi-link part, and that provides an elastic force to the multi-link part, a profile adjusting part coupled to an opposite side of the multi-link part, and a portion of which is configured to be rotatable, a rotation guide part connected to the profile adjusting part, and configured to rotate the profile adjusting part, and a power providing part connected to the rotation guide part, and that operates the rotation guide part, and the power providing part includes a wire pulley that is rotatable, and a wire connecting the wire pulley and the rotation guide part, and that operates the rotation guide part as the wire pulley is rotated.

The rotation guide part may include a connection member connected to the profile adjusting part, a movable member engaged with the connection member, and configured to slide the connection member, and a rotary member fixing the wire, and configured to rotate the movable member by using the wire.

The movable member may include a lead screw.

The rotary member may include a wire recess extending along a circumference of the rotary member, and accommodating the wire.

The wire pulley may include a pulley recess formed at a circumference of the wire pulley, and accommodating the wire.

The rotation guide part may further include a guide housing accommodating the connection member and the movable member.

The wire pulley may be mounted on the guide housing to be rotatable.

The power providing part may further include a pulley shaft configured to rotate the wire pulley, coupled to the guide housing to be rotatable, and fixed to the wire pulley.

When a side, on which the wire pulley faces the guide housing, is defined as one side, the wire pulley may include a guide hole formed on one surface facing an opposite side.

A plurality of guide holes may be provided, and the plurality of guide holes may be disposed to surround the pulley shaft around the pulley shaft.

The muscle strength aid device may further include a body frame accommodating the multi-link part, the elastic force providing part, and the profile adjusting part, and the guide housing may be coupled to the body frame.

The profile adjusting part may include a profile disk connected to the connection member to be rotatable, the profile disk may include a disk area configured to be rotatable, and a stop boss protruding from the disk area in a direction being perpendicular to the disk area, and the connection member may include a stop hole, into which the stop boss is inserted.

The guide housing may include a slot extending in a direction, in which the connection member is slid, and the movable member may include a slider inserted into the slot and exposed to an outside.

The multi-link part may include a first link, one side of which is coupled to the profile adjusting part, and when the profile adjusting part is rotated, the one side of the first link may be configured to be revolved about a rotation center of the profile adjusting part so that the elastic force applied to the multi-link part by the elastic force providing part is changed.

The multi-link part may further include a second link, one side of which is coupled to the elastic force providing part, and when the profile adjusting part is rotated, the one side of the second link may be configured to be moved, so that the force applied to the multi-link part by the elastic force providing part is changed.

The multi-link part may further include a third link coupled to an opposite side of the first link to be rotatable, and coupled to an opposite side of the second link to be rotatable.

The muscle strength aid device may further include a body frame accommodating the multi-link part, the elastic force providing part, and the profile adjusting part, and the multi-link part may further include a fourth link, one side of which is fixed to the body frame, and an opposite side of which is coupled to the third link to be rotatable.

According to an aspect of the present disclosure, a muscle strength aid device includes a multi-link part including one or more links, an elastic force providing part coupled to one side of the multi-link part, and that provides an elastic force to the multi-link part, a profile adjusting part coupled to an opposite side of the multi-link part, and a portion of which is configured to be rotatable, a rotation guide part connected to the profile adjusting part, and configured to rotate the profile adjusting part and a power providing part connected to the rotation guide part, and that operates the rotation guide part.

The power providing part may include a wire pulley that is rotatable, and a wire connecting the wire pulley and the rotation guide part, and that operates the rotation guide part as the wire pulley is rotated.

According to an aspect of the present disclosure, a muscle strength aid device includes a multi-link part including one or more links, an elastic force providing part coupled to one side of the multi-link part, and that provides an elastic force to the multi-link part, a profile adjusting part coupled to an opposite side of the multi-link part, and a portion of which is configured to be rotatable, a rotation guide part connected to the profile adjusting part, and configured to rotate the profile adjusting part and a power providing part connected to the rotation guide part, and that operates the rotation guide part. The power providing part may include a wire pulley that is rotatable and a wire connecting the wire pulley and the rotation guide part, and that operates the rotation guide part as the wire pulley is rotated and a body frame accommodating the multi-link part, the elastic force providing part, and the profile adjusting part.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings:

FIG. 1 is a view illustrating an internal structure of a muscle strength aid device according to an embodiment of the present disclosure;

FIG. 2 is an enlarged view of a muscle strength aid device according to an embodiment of the present disclosure;

FIG. 3 is a bottom view of a muscle strength aid device according to an embodiment of the present disclosure;

FIG. 4 is a view illustrating an internal structure of a muscle strength aid device when a connection member is located at an arbitrary initial position according to an embodiment of the present disclosure;

FIG. 5 is a view illustrating an internal structure of a muscle strength aid device when a connection member is moved compared to FIG. 4 according to an embodiment of the present disclosure;

FIG. 6 is a graph illustrating examples of a functional relationship of various types of rotational angles and rotational forces that may be formed by a muscle strength aid device according to an embodiment of the present disclosure; and

FIG. 7 is a graph depicting a rotational angle of a profile disk according to a displacement of a stop boss of a muscle strength aid device in direction “A” and a displacement of a connection member in direction “B” according to a rotational displacement of a rotary member according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals will be used throughout to designate the same or equivalent components. Furthermore, in describing the embodiments of the present disclosure, detailed descriptions associated with well-known functions or configurations will be omitted if they may make subject matters of the present disclosure unnecessarily obscure.

In describing components of embodiments of the present disclosure, the terms first, second, A, B, (a), (b), and the like may be used herein. These terms are only used to distinguish one element from another element, and do not limit the corresponding elements irrespective of the nature, order, or priority of the corresponding elements. Furthermore, unless otherwise defined, all terms including technical and scientific terms used herein are to be interpreted as is customary in the art to which the present disclosure belongs. Such terms as those defined in a generally used dictionary are to be interpreted as having meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted as having ideal or excessively formal meanings unless clearly defined as having such in the present application.

FIG. 1 is a view illustrating an internal structure of a muscle strength aid device according to an embodiment of the present disclosure.

Referring to FIG. 1, a muscle strength aid device 100 according to the present disclosure may include a body frame 110, a profile adjusting part 200, multi-link parts 220, 230, 240, 250, and 260, an elastic force providing part 300, an end link part 400, and a rotation guide part 500.

The muscle strength aid device 100 may further include a base part (not illustrated) that is connected to the user's body and is located to correspond to an upper end of an upper arm of the user. The muscle strength aid device 100 may be configured to be rotatable in a counterclockwise direction from a first direction D1 toward a second direction D2 on a plane of FIG. 1, or a clockwise direction from the second direction D2 toward the first direction D1 with respect to one point of the base part while the profile adjusting part 200, the multi-link parts 220, 230, 240, 250, and 260, the elastic force providing part 300, the end link part 400, and the rotation guide part 500 are coupled to the body frame 110.

While the elastic force providing part 300 of the muscle strength aid device 100 is coupled to the body frame 110, a rotational torque that varies with respect to a point of the base part may occur. The body frame 110 may form a profile of a rotational torque that varies depending on an angle with respect to the base part.

The base part and the body frame 110 may have rotational torques in opposite directions. The rotational torque of the body frame 110 may be expressed as an outer product value of a distance from a point of the base part and a magnitude of a force that the muscle strength aid device has to support.

The body frame 110 may be formed such that the first direction D1 becomes a lengthwise direction. The body frame 110 may define a space that is defined by the second direction D2 that is perpendicular to the first direction D1, a third direction D3 (see FIG. 2) that is perpendicular to both of the first direction D1 and the second direction D2, and the first direction D1.

The profile adjusting part 200, the multi-link parts 220, 230, 240, 250, and 260, the elastic force providing part 300, and the end link part 400 may be accommodated in an interior of the body frame 110. The profile adjusting part 200 may be mounted on the body frame 110 to be rotatable.

The profile adjusting part 200 may be connected to the multi-link parts 220, 230, 240, 250, and 260 to operate the multi-link parts 220, 230, 240, 250, and 260. The multi-link parts 220, 230, 240, 250, and 260 may guide the operation of the elastic force providing part 300.

The rotation guide part 500 may be mounted on the outside the body frame 110. The rotation guide part 500 may be connected to the profile adjusting part 200 and may operate the profile adjusting part 200.

The multi-link parts 220, 230, 240, 250, and 260 may include one or more links. The elastic force providing part 300 may be coupled to sides of the multi-link parts 220, 230, 240, 250, and 260, and may provide a force by elastic force to the multi-link parts 220, 230, 240, 250, and 260. The profile adjusting part 200 may be coupled to opposite sides of the multi-link parts 220, 230, 240, 250, and 260, and some of them may be configured to be rotatable with respect to a profile axis PA (see FIG. 2).

The profile adjusting part 200 may include a profile disk 210, an interference area 213, and a stopper 214. The profile disk 210 may be configured to be rotatable with respect to a profile axis PA. One side of the profile disk 210 may be coupled to the multi-link parts 220, 230, 240, 250, and 260. The interference area 213 is coupled to the profile disk 210, and may be rotated together with the profile disk 210 and may interfere with the stopper 214. When the interference area 213 is interfered by the stopper 214, rotation of the profile disk 210 may be limited.

The multi-link parts 220, 230, 240, 250, and 260 may include one or more links. The multi-link parts 220, 230, 240, 250, and 260 may include a plurality of links. More preferably, the multi-link parts 220, 230, 240, 250, and 260 may have a linkage structure, in which a plurality of links are connected to each other to be rotatable. As an example, the plurality of links provided in the multi-link parts 220, 230, 240, 250, and 260 may be connected to each other to be rotatable on the same plane.

When the profile disk 210 is rotated about the profile axis PA, sides of the multi-link parts 220, 230, 240, 250, and 260 may be fixedly coupled to one component of the profile adjusting part 200 so that the sides of the multi-link parts 220, 230, 240, 250, and 260 may be revolved around the profile axis PA.

The multi-link parts 220, 230, 240, 250, and 260 may include a first link 220, a second link 230, a third link 240, a fourth link 250, and a fifth link 260.

One side of the first link 220 may be coupled to the profile adjusting part 200, and an opposite side thereof may be coupled to the third link 240. The first link 220 may be coupled to the profile disk 210 to be rotatable. When the profile adjusting part 200 is rotated, one side of the first link 220 is configured to be revolved around a rotation center of the profile adjusting part 200, and thus a force applied by the elastic force providing part 300 to the multi-link parts 220, 230, 240, 250, and 260 may be changed.

One side of the second link 230 may be coupled to the elastic force providing part 300, and an opposite side thereof may be coupled to the third link 240. The second link 230 may be coupled to the elastic force providing part 300. The second link 230 may be coupled to the third link 240 to be rotatable. When the profile adjusting part 200 is rotated, one side of the second link 230 is configured to be moved, and thus, the force applied by the elastic force providing part 300 to the multi-link parts 220, 230, 240, 250, and 260 may be changed.

The third link 240 may be coupled to an opposite side of the first link 220 to be rotatable, and may be coupled to an opposite side of the second link 230 to be rotatable. The third link 240 may interwork with the rotation of the first link 220 to guide the rotation of the second link 230.

One side of the fourth link 250 may be fixed to the body frame 110, and an opposite side thereof may be coupled to the first link 220 and the third link 240 to be rotatable. One side of the fifth link 260 may be fixed to the body frame 110, and an opposite side thereof may be coupled to the third link 240 to be rotatable. The fourth link 250 and the fifth link 260 may guide the movement of the third link 240 so that the third link 240 may be rotatable in the body frame 110.

The elastic force providing part 300 may be coupled to sides of the multi-link parts 220, 230, 240, 250, and 260, and may provide a force by elastic force to the multi-link parts 220, 230, 240, 250, and 260. The elastic force providing part 300 may include a spring 310 and a spring support plate 320. The elastic force providing part 300 may include a plurality of springs 310. Sides of the plurality of springs 310 may be coupled to an opposite side of the second link 230. The spring support plate 320 may be coupled to the second link 230 at two points.

The muscle strength aid device 100 may serve to aid muscle strength required by the user. The muscle strength aid device 100 may aid muscle strength of the user by using an elastic force of the plurality of springs 310.

One side of the end link part 400 may be coupled to be rotatable with respect to the body frame 110, and an opposite side thereof may be coupled to the elastic force providing part 300. The end link part 400 may be connected to opposite sides of the plurality of springs 310.

According to the above-described principle, as the profile disk 210 is rotated, the elastic force providing part 300 may aid the user with the muscle strength.

Meanwhile, the rotation guide part 500 may be provided as a configuration for guiding the rotation of the profile disk 210. The rotation guide part 500 is connected to the profile adjusting part 200, and may be configured to rotate the profile adjusting part 200. The rotation guide part 500 may be operated by a power providing part 600 (see FIG. 2) to rotate the profile adjusting part 200.

The rotation guide part 500 may include a connection member 510 that is connected to the profile adjusting part 200, a movable member 520 that is engaged with the connection member 510 to slide the connection member 510, and a rotary member 530 that is configured to rotate the movable member 520.

The movable member 520 may be formed as a lead screw. With this structure, as the rotary member 530 is rotated, the movable member 520 may be rotated together, and the connection member 510 may be slid as the movable member 520 is rotated. As the connection member 510 is moved, the profile disk 210 may be rotated.

The rotation guide part 500 may further include a support member 540 and a guide housing 550. The guide housing 550 may accommodate the connection member 510 and the movable member 520. One end of the movable member 520 may be coupled by the rotary member 530, and an opposite end of the movable member 520 may be supported by the support member 540. The guide housing 550 may accommodate the rotary member 530 and the movable member 520. The guide housing 550 may be coupled to the body frame 110.

Opposite ends of the guide housing 550 may be formed to be opened with respect to a lengthwise direction of the guide housing 550. The rotary member 530 may be seated at one end of the guide housing 550 to be rotatable, and the support member 540 may be provided at an opposite end of the guide housing 550.

Meanwhile, the profile disk 210 may be connected to the connection member 510. The profile disk 210 may be configured to be rotated by the connection member 510. The profile disk 210 may include a stop boss 211 and a disk area 212. The disk area 212 may be configured to be rotated. The stop boss 211 may protrude from the disk area 212 in a direction that is perpendicular to the disk area 212. The stop boss 211 may protrude from the disk area 212 in the third direction D3.

The connection member 510 may include a stop hole 511, into which the stop boss 211 is inserted. The stop hole 511 may extend in a movement direction of the stop boss 211 on an imaginary plane that is perpendicular to the third direction D3.

FIG. 2 is an enlarged view of a muscle strength aid device according to an embodiment of the present disclosure. FIG. 3 is a bottom view of a muscle strength aid device according to an embodiment of the present disclosure.

Referring to FIGS. 2 and 3, the muscle strength aid device 100 may include a rotation guide part 500 and a power providing part 600. The power providing part 600 may be connected to the rotation guide part 500 to operate the rotation guide part 500.

The guide housing 550 of the rotation guide part 500 may be coupled to the body frame 110. The slot 551 may be included such that a portion of the connection member 510 (see FIG. 1) is exposed. The slot 551 may be formed on an opposite side that faces an opposite direction to the one side that faces the profile disk 210 of the guide housing 550. The slot 551 may extend in a direction, in which the connection member 510 is slid.

The connection member 510 may include a slider 512 that defines a stop hole 511 on one side and is inserted into the slot 551 on an opposite side to be exposed to the outside. The connection member 510 may protrude from the guide housing 550 on one side to be connected to the profile disk 210, and may be inserted into the slot 551 on an opposite side to be exposed to the outside. A scale that may be identified by the user may be engraved on an area that is parallel to the slot 551 of the guide housing 550.

According to this structure, the user may identify the displacement of the slider 512 and identify the position of the connection member 510 to estimate the magnitude of the elastic force which the muscle strength aid device 100 may aid.

The rotary member 530 may be formed in a cylindrical shape. The rotary member 530 may include a portion that protrudes to the outside of the guide housing 550. The rotary member 530 may include a wire recess 531 that extends along a circumference of the rotary member 530.

The power providing part 600 may include a wire pulley 610 and a wire 630 that is wound around the wire pulley 610. The wire pulley 610 may be mounted on the guide housing 550 to be rotatable. The wire 630 may connect the wire pulley 610 to the rotary member 530. One end of the wire 630 may be fixed to the wire pulley 610, and an opposite end of the wire 630 may be fixed to the rotary member 530. The wire 630 may be coupled to the wire pulley 610 and the rotary member 530.

The power providing part 600 may include a pulley shaft (not illustrated) that is configured to rotate the wire pulley 610 and is coupled to an interior of the guide housing 550 to be rotatable, and is fixed to the wire pulley 610.

Although not illustrated in the drawings, the pulley shaft is coupled to the guide housing 550 to be rotated, and may be rotated together with the wire pulley 610. The pulley shaft may extend in an extension direction of the profile axis PA.

The wire pulley 610 may be rotated around the profile axis PA. The wire 630 may operate a rotation guide part 500 as the wire pulley 610 is rotated. In other words, the rotary member 530 may rotate the movable member 520 by using the wire 630.

The wire pulley 610 may include a pulley recess 611 that is formed around the wire pulley 610 in the circumferential direction, and accommodates the wire 630. In this way, one end portion of the wire 630 may be accommodated in the pulley recess 611, and an opposite end portion of the wire 630 may be accommodated in the wire recess 531. The wire recess 531 may extend continuously along a circumference of the rotary member 530.

The wire pulley 610 may include a guide hole 620 that helps rotate the wire pulley 610. The guide hole 620 may be formed on one surface of the wire pulley 610, which faces an opposite side to an opposite side to one side that faces the guide housing 550.

A plurality of guide holes 620 may be formed. The plurality of guide holes 620 may be disposed to surround the pulley shaft. The plurality of guide holes 620 may be spaced apart from each other along a specific interval in the circumferential direction of the wire pulley 610.

According to this structure, because the user's finger may be inserted into the guide hole 620, rotation of the wire pulley 610 may be relatively easy. Accordingly, because the user may rotate the wire pulley 610 by using the hand, an elastic force that may be aided by the muscle strength aid device 100 may be more finely adjusted.

FIG. 4 is a view illustrating an internal structure of a muscle strength aid device when a connection member is located at an arbitrary initial position according to an embodiment of the present disclosure. FIG. 5 is a view illustrating an internal structure of a muscle strength aid device when a connection member is moved compared to FIG. 4 according to an embodiment of the present disclosure. FIG. 6 is a graph illustrating examples of a functional relationship of various types of rotational angles and rotational forces that may be formed by a muscle strength aid device according to an embodiment of the present disclosure. FIG. 7 is a graph depicting a rotational angle of a profile disk according to a displacement of a stop boss of a muscle strength aid device in direction “A” and a displacement of a connection member in direction “B” according to a rotational displacement of a rotary member according to an embodiment of the present disclosure.

Referring to FIGS. 4 to 7, the connection member 510 of the muscle strength aid device 100 may be slid in the direction “B”. In more detail, as the wire pulley 610 (see FIG. 2) is rotated, the rotary member 530 and the movable member 520 may be rotated, and the profile disk 210 may be rotate as the movable member 520 is rotated.

With this structure, when the movable member 520 is displaced in direction “B”, a displacement of the stop boss 211 in direction “A” occurs, and the profile disk 210 may be rotated clockwise or counterclockwise. When the profile disk 210 is rotated, the multi-link parts 220, 230, 240, 250, and 260 are rotated to change the length of “L”, and thus, the elastic force that may be applied by the elastic force providing part 300 is changed.

However, in the muscle strength aid device 100 of the present disclosure, the wire pulley 610 may rotate the profile disk 210 through the rotation guide part 500 without simply rotating the profile disk 210 directly. That is, in the muscle strength aid device 100 of the present disclosure, the rotational displacement of the wire pulley 610 may be converted into a sliding displacement of the connection member 510 and then converted back into a rotational displacement of the profile disk 210.

With this structure, an angle, at which the profile disk 210 is rotated, may be adjusted more finely than an angle at which the wire pulley 610 is rotated. That is, the change in the “L” value according to the rotational displacement of the wire pulley 610 may be minimized. Here, the “L” value may be a length from a point, at which the first link 220 and the third and fourth links 240 and 250 meet each other, to the end link part 400.

With this structure, a torque of the rotation guide part 500 for rotating the profile disk 210 may be minimized, so that the user may more easily rotate the wire pulley 610.

Furthermore, even when an elastic force is applied to the profile disk 210 by the elastic force providing part 300, the profile disk 210 may be fixed in a position by the rotation guide part 500 without a separate latch structure. The separate latch structure may have a high failure rate due to the concentrated load, or it may be difficult to be operated due to the load, but unlike this, the muscle strength aid device 100 of the present disclosure may lock the rotation position of the profile disk 210 without a separate latch structure, so it may be easily operated while improving durability.

Referring to FIGS. 4 and 6, the “x” axis of FIG. 6 may be understood as the angle between the imaginary line extending from one point the base part in the first direction D1 and the extending imaginary line of the body frame 110 (i.e., the angle from the user's shoulder to the point at which the rotational torque is required), and the “y” axis may be the value of the rotational torque that is provided to the user by the muscle strength aid device 100.

Referring to the graph illustrated in FIG. 6, when the profile disk 210 is not rotated (for example, FIG. 4), the rotational torque of the muscle strength aid device 100 may be changed along a solid line graph. Unlike this, when the profile disk 210 is rotated at a specific angle, the rotational torque of the muscle strength aid device 100 may be switched as in a dotted line graph.

For example, in the solid line graph, when the angle between the imaginary line that extends from one point of the base part in the first direction D1 and the extending imaginary line of the body frame 110 is between 60 and 80 degrees, the muscle strength aid device 100 may support the user with the maximum rotational torque.

Unlike this, in the dotted line graph, when the angle between the imaginary line that extends from one point of the base part in the first direction D1 and the extending imaginary line is about 120 degrees, the muscle strength aid device 100 may support the user with a maximum rotational torque.

Accordingly, an angle of the maximum rotational torque that may aid the user may be adjusted through a degree of rotation of the profile disk 210 by the muscle strength aid device 100 of the present disclosure.

A maximum torque required may be different depending on the user's posture, and the muscle strength aid device 100 of the present disclosure may adjust an angle at which the muscle strength aid device 100 may support the maximum rotational torque to the user, and may be adjusted depending on an amount of rotation of the profile disk 210, and, thus, convenience of the user may be improved.

Referring to FIGS. 5 and 7, a relationship between the rotation guide part 500 and the profile adjusting part 200 may be identified. The first graph represents a rotation angle of the profile disk 210 depending a displacement of the stop boss 211 in direction “A”. The second graph represents a sliding displacement of the rotary member 530 in direction “B” depending on a rotation angle of the rotary member 530.

Referring to the two graphs, it may be identified that when the rotary member 530 is rotated, the connection member 510 is slid in direction “B”, and accordingly, the stop boss 211 may be displaced in direction “A”, so that the profile disk 210 may be rotated in the clockwise or counterclockwise direction.

According to the present technology, because the angle at which the muscle strength aid device may support the maximum rotational torque to the user may be adjusted depending on to the rotation amount of the profile disk, convenience of the user may be improved.

In addition, according to the present technology, because the torque profile of the muscle strength aid device may be changed by using the user's finger, convenience of the user may be improved.

In addition, according to the present technology, because the wire pulley is mounted on the outside of the accommodation frame, the user may more easily change the torque profile of the muscle strength aid device.

In addition, according to the present technology, because the rotational force of the wire pulley is transmitted to the profile adjusting part through the rotation guide part, an operation change in the torque profile may be possible.

In addition, according to the technology, because the slider of the movable member is exposed to the outside through the slot, the user may identify the degree of change in the torque profile through the movable member.

Besides, a variety of effects directly or indirectly understood through the present disclosure may be provided.

The above description is merely an example of the technical idea of the present disclosure, and various modifications and variations may be made by one skilled in the art without departing from the essential characteristic of the present disclosure.

Accordingly, embodiments of the present disclosure are intended not to limit but to explain the technical idea of the present disclosure, and the scope and spirit of the present disclosure is not limited by the above embodiments. The scope of protection of the present disclosure should be construed by the attached claims, and all equivalents thereof should be construed as being included within the scope of the present disclosure.