KR102456663B1 - Strength training device with reduced resistance deviation - Google Patents

Abstract

The present invention relates to a strength training device with reduced resistance deviation, which comprises: a frame; a rotating shaft rotatably provided to the frame; a flywheel provided on the rotating shaft to generate a moment of inertia according to rotation of the rotating shaft; a brake provided on the rotating shaft to provide rotational resistance of the rotating shaft; a base made of an elastic material and unwound or wound around the rotating shaft by a pulling or unwinding motion to rotate the rotating shaft; and a strap having a lower modulus of elasticity than that of the base and including a plurality of directional members formed at regular intervals from the surface of the base toward the winding direction of the rotating shaft. According to the present invention, since a speed difference caused by a difference in resistance during unwinding and winding of the strap can be offset through the brake and the directional member formed on the surface of the strap, resistance deviation between concentric contraction occurring during a user's pulling motion and elongation occurring during the unwinding motion is reduced, thereby providing an effect of preventing injuries occurring due to rapid eccentric contractions.

Description

Strength training device with reduced resistance deviation

The present invention relates to a muscle strength exercise device in which the resistance deviation is alleviated, and more particularly, by the resistance deviation between the uniaxial contraction and the extensibility contraction that occurs according to the difference in winding / unwinding speed that may occur when using the exercise device. It relates to a strength training device that can minimize the risk of injury to the user that may occur.

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

The conventional muscle strength exercise device includes a rotation shaft, a strap that is unwound or wound on a rotation shaft by a user's pulling or pulling operation, and a strap for rotating the rotation shaft, and a flywheel provided on the rotation shaft. Sexual contraction occurs, and stretch contraction occurs when the user releases the pull. Here, the uniaxial contraction is a type of dynamic contraction occurring as the length of the muscle is shortened, and the extensible contraction is a type of dynamic contraction occurring as the length of the muscle is increased.

As an example of such a strength exercise device, Korean Patent Publication No. 10-2021-0096994 discloses an 'upper body exercise device'.

The invention is a body portion provided with a seat so that the user can be seated; an operation unit having one end of an arm pivotally coupled to the main body through a hinge shaft, and a handle provided at the other end of the arm to be gripped by a user; and an exercise load generating unit that is connected to the arm and the strap via a strap and is provided with a flywheel so as to add an exercise load due to rotational inertia to the arm. It relates to an upper body exercise device that can use a load for muscle growth or rehabilitation exercise in the upper chest area.

The flywheel included in such an exercise device generates a moment of inertia according to the rotation of the rotating shaft. Therefore, when the rotating shaft rotates forward (the strap is unwound from the rotating shaft) by the user's pulling action, the moment of inertia of the rotating shaft increases by the flywheel. In other words, as the rotational shaft rotates forward faster by the user's pulling motion, the rotational speed of the flywheel also increases, and the increased rotational speed increases the energy stored in the flywheel faster and more.

On the other hand, when the rotating shaft is reversely rotated (the strap is wound around the rotating shaft) by the user's pulling release operation, the moment of inertia of the rotating shaft by the flywheel is reduced, that is, the energy stored in the flywheel may be quickly consumed.

At this time, when the user performs a pulling operation, that is, during the pulling operation, the rotation shaft rotates by the force applied by the user to the rotation shaft during the user's pulling operation, and energy is stored in the flywheel, but when the pulling operation is released, the energy stored in the flywheel is As it is rapidly consumed, the reverse rotation speed of the rotating shaft rapidly increases.

Therefore, a deviation may occur in the resistance applied between the uniaxial contraction, which is a dynamic contraction that occurs when the user performs a pulling operation, and the extensible contraction, which is generated during the pulling-off operation, thereby increasing the risk of injury to the user. There was an increase in problems.

In order to solve this problem, it is possible to develop a new and advanced strength training device that can minimize the user's risk of injury that may occur depending on the deviation between the uniaxial contraction and the extensibility contraction that may occur when using the exercise device. This is the time when the need arises.

Korean Patent Publication No. 10-2021-0096994

The main purpose of the present invention is to prevent injuries by reducing the deviation between the resistance generated in the uniaxial contraction during the user's pulling operation and the resistance occurring in the extensible contraction during the user's pulling-off operation when using the strength training device. do.

Another object of the present invention is to enhance the effect of preventing injury by adjusting the deviation between resistances through differential adjustment of elasticity.

Another object of the present invention is to provide a composition of a novel additive for elasticity control.

In order to achieve the above object, a muscle strength exercise device with reduced resistance deviation according to the present invention, a frame; a rotating shaft rotatably provided on the frame; a flywheel provided on the rotating shaft to generate a moment of inertia according to the rotation of the rotating shaft; a brake provided on the rotation shaft to provide rotation resistance of the rotation shaft; As to rotate the rotation shaft by being unwound or wound on the rotation shaft by a pulling or unwinding operation, a base made of an elastic material, and a modulus of elasticity lower than that of the base, from the surface of the base toward the winding direction of the rotation shaft at a predetermined interval and a strap including a directional member formed in plurality.

Furthermore, the directional member is characterized in that it has a 'V' shape.

In addition, the directional member includes a first member having a first elastic modulus lower than the elastic modulus of the base, and a first member located outside the first member in a circumferential portion in the winding direction, a first elastic modulus lower than the first elastic modulus and a second member having a modulus of elasticity of 2;

The directional member may include a third member positioned at a peripheral portion in the unwinding direction opposite to the second member and having a third modulus of elasticity higher than that of the base.

According to the muscle strength exercise device in which the resistance deviation of the present invention is alleviated,

1) Through the directional member formed on the surface of the brake and the strap, it is possible to offset the speed difference caused by the difference in resistance during unwinding and winding of the strap, so that the uniaxial contraction and release operation that occurs during the user's pulling operation By alleviating the resistance deviation between the extensible contractions occurring, it is possible to prevent injuries that may occur due to rapid stretch contractions,

2) By including the directional member of the double structure and furthermore the triple structure, the energy offset effect in the unwinding direction is strengthened to prevent rapid stretchable contraction from occurring, and at the same time, it is effective for repeated contraction/stretching of the directional member. Minimize permanent deformation

3) The effect of strengthening the effect of minimizing permanent deformation due to repeated contraction/elongation through the third member composition containing the deformation inhibitor, and at the same time allowing the physical properties to be maintained for a long time even after repeated use or contact with body fluids there is

1 is a perspective view showing a strength exercise device of the present invention.
Figure 2 is an exploded perspective view showing the flywheel cover, flywheel and flywheel auxiliary cover of the muscle strength exercise device of the present invention.
3 is an exploded perspective view showing a conductor member cover, a brake, and a conductor member auxiliary cover of the strength training device of the strength training device of the present invention.
Figure 4 is a conceptual view showing a state in which the strap is wound on the rotating shaft.
5 is a conceptual diagram showing an example of use of the strength exercise device of the present invention.
6 is a conceptual diagram of a strap of the present invention.
7 is a conceptual diagram illustrating an enlarged view of the directional member;
Figure 8 is a flow chart showing the steps for preparing the anti-deformation agent.
9 is a flowchart showing the steps of preparing a physical property maintenance agent.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each figure refer to like components.

1 is a perspective view showing a strength exercise device of the present invention, FIG. 2 is an exploded perspective view showing a flywheel cover, a flywheel, and a flywheel auxiliary cover of the strength exercise device of the present invention, and FIG. It is an exploded perspective view showing the conductor member cover, the brake, and the conductor member auxiliary cover of the device, and FIG. 4 is a conceptual view showing the state in which the strap is wound around the rotating shaft.

Referring to FIGS. 1 to 4 , the strength exercise device with reduced resistance deviation of the present invention includes a frame 200 , a rotation shaft 300 , a flywheel 400 , a brake 600 , and a strap 500 . characterized.

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 in a direction away from the center of the frame 200 . Subsequently, the conductive member cover 240 and the conductive member auxiliary cover 250 may be provided on the other side of the frame 200 in a direction away from the center of the frame 200 . The frame 200 may be accommodated in the housing 100 .

The housing 100 may have a pair of footrests. Therefore, in a sitting position, the user can hold the handle 700 with both hands, pull or release the strap 500, and perform strength exercise in a state where both feet are supported on a pair of footrests of the housing 100. have. In addition, in a standing posture, the user holds the handle 700 with both hands, pulls or releases the strap 500, and performs muscle strength exercise while holding both feet on a pair of footrests of the housing 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 flywheel cover 220 passes through the rotation shaft 300 , and covers one side of the flywheel 400 . A first bearing 280 for smooth rotation of the rotary shaft 300 may be provided between the inner circumferential surface of the flywheel cover 220 and the outer circumferential surface of 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 suffer wear due to friction with the strap 500 wound around or unwound on the bobbin 301 . can In order to prevent this, the 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 sector shape.

The flywheel auxiliary cover 230 passes through one side of the rotation shaft 300 , is coupled to the flywheel cover 220 with the flywheel 400 interposed therebetween, and covers the other side of the flywheel 400 .

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

The conductive member cover 240 passes through the other side of the rotation shaft 300 , and covers one side of the conductive member 610 . A second bearing 290 for smooth rotation of the rotary shaft 300 may be provided between the inner circumferential surface of the conductive member cover 240 and the outer circumferential surface of the rotary shaft 300 .

The conductive member cover 240 may be disposed adjacent to the other side of the bobbin 301, and the conductive member cover 240 may be worn due to friction with the strap 500 wound around or unwound on the bobbin 301. have. To prevent this, the second reinforcing member 270 made of steel may be provided on the opposite surface of the conductive 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 conductive member cover 240 facing the strap 500 . For example, the second reinforcing member 270 may be formed in a sector shape.

The conductive member auxiliary cover 250 passes through the other side of the rotating shaft 300 , is coupled to the conductive member cover 240 with the conductive member 610 interposed therebetween, and covers the other side of the conductive member 610 .

Meanwhile, the flywheel auxiliary cover 230 , the flywheel cover 220 , the first reinforcing member 260 , the second reinforcing member 270 , the conductive member cover 240 and the conductive member auxiliary cover 250 are the connectors 210 . can be releasably coupled to each other by Specifically, the connector 210 includes the flywheel auxiliary cover 230 , the flywheel cover 220 , the first reinforcing member 260 , the second reinforcing member 270 , the conductive member cover 240 , and the conductive member auxiliary cover 250 . ) may be sequentially penetrated.

The rotating shaft 300 is rotatably provided on the frame 200 . The rotation 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 conductive member cover 240 and the conductive member auxiliary cover 250 . It can be passed through sequentially.

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

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

The flywheel 400 is fixed to one side of the rotation shaft 300 , and when the rotation shaft 300 is rotated, the flywheel 400 may also be rotated. For example, a first fixing hole 410 of a polygonal shape 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 rotation shaft 300 , , as the first fixing bar 310 of the rotation shaft 300 is fixed to the first fixing hole 410 of the flywheel 400, when the rotation shaft 300 is rotated, the flywheel 400 may also be rotated.

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 , it is possible to easily replace the flywheel 400 . Accordingly, the user can easily apply and replace the flywheel 400 of various diameters and sizes.

5 is a conceptual diagram showing an example of use of the strength exercise device of the present invention.

If the structure of the strap 500 and the brake 600 included in the strength training device and the example of use of the strength training device are described in more detail with reference to FIGS. 1 to 4 and 5 described above, the strap 500 is the user's It is unwound or wound on the rotating shaft 300 by pulling or pulling off operation, so that the rotating shaft 300 can be rotated. In this case, the strap 500 is preferably made of a material having elasticity, that is, an elastic material, so that it may not be easily broken even during repeated winding and unwinding. The material constituting the strap 500 is not limited, but preferably the strap 500 is a thermoplastic elastomer (TPE), nitrile-butadiene rubber (NBR), polyvinyl chloride (Polyvinyl chloride). , PVC), and may be made of a material containing at least one of ethylene vinyl acetate (EVA).

The strap 500 may be formed in the same shape as a conventional string, or may have a circular longitudinal cross-section, and there is no limitation on the thickness or shape of the longitudinal cross-section.

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

On the other hand, during the user's pulling operation of the strap 500, uniaxial contraction, which is a muscle strength generated as the length of the user's muscle is shortened, may occur. In addition, when the user's strap 500 pull-releasing operation, the length of the user's muscle lengthening may occur, which is a muscle strength, elongational contraction.

The brake 600 is provided on the rotation shaft 300 , and serves to provide rotation resistance of the rotation shaft 300 , and the brake 600 may include a conductor member 610 and a magnetic member 620 . Preferably, the conductor member 610 may be provided on the other side of the rotation shaft 300 to rotate.

The conductive member 610 is fixed to the other side of the rotation shaft 300 , and when the rotation shaft 300 is rotated, the conductive member 610 may also be rotated. For example, the second fixing hole 611 having a polygonal shape is provided in the conductor member 610 , and the second fixing bar 320 corresponding to the second fixing hole 611 is formed on the other side of the rotation shaft 300 . As the second fixing bar 320 of the rotation shaft 300 is fixed to the second fixing hole 611 of the conductive member 610, when the rotation shaft 300 rotates, the conductive member 610 is also rotated. can

The conductive member 610 is accommodated between the conductive member cover 240 and the conductive member auxiliary cover 250 that are detachably coupled to each other. Therefore, by simply separating the conductive member cover 240 and the conductive member auxiliary cover 250 , it is possible to easily replace the conductive member 610 . Accordingly, the user can easily apply and replace the conductor member 610 of various diameters and sizes.

The magnetic member 620 generates a magnetic force and is disposed adjacent to the conductor member 610 , and when the conductor member 610 rotates, the torque of the conductor member 610 may be reduced by eddy currents. Specifically, the magnetic member 620 may form a magnetic field, and the magnetic field may form an eddy current 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 conductive member 610 rotates, the Torque can be decelerated. On the other hand, if the torque of the conductor member 610 is reduced, the torque of the rotating shaft 300 coupled to the conductor member 610 will also be reduced.

The magnetic member 620 may be coupled to the conductive member cover 240 or the conductive 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 increased, the torque deceleration effect of the conductor member 610 may be increased as the intensity of the eddy current formed by the permanent magnet in the conductor member 610 increases. In addition, as the number of permanent magnets is decreased, the strength of the eddy current formed by the permanent magnets in the conductor member 610 decreases, so that the torque deceleration effect of the conductor member 610 may be decreased.

As another example, the magnetic member 620 may include one or more electromagnets. Here, as the intensity of the current applied to the electromagnet increases, the torque deceleration effect of the conductor member 610 may increase as the intensity of the eddy current formed by the electromagnet in the conductor member 610 increases. In addition, as the intensity of the current applied to the electromagnet decreases, the torque deceleration effect of the conductor member 610 may decrease as the intensity of the eddy current formed by the electromagnet in the conductor member 610 decreases.

Therefore, when the rotation shaft 300 is rotated forward by the pulling operation of the strap 500 of the user, the moment of inertia of the rotation shaft 300 is increased by the flywheel 400, and therefore, the forward rotation of the rotation shaft 300 is easy However, as the brake 600 provides rotational resistance to the rotational shaft 300 , a large resistance may be applied to the user's uniaxial contraction.

In addition, when the rotation shaft 300 is reversely rotated by the user's pulling release operation of the strap 500 of the user, the brake 600 provides a very small rotational resistance to the rotation shaft 300, but by the flywheel 400, the rotation shaft ( The moment of inertia of 300 is reduced, and thus, as the reverse rotation of the rotating shaft 300 becomes difficult, a large resistance is applied to the user's extensibility contraction.

As a result, by reducing the deviation between the resistance generated in the uniaxial contraction during the user's pulling operation and the resistance occurring in the extensible contraction during the user's pulling-off operation, injury to the user can be prevented.

6 is a conceptual diagram of a strap of the present invention.

Referring further to FIG. 6 , the surface of the strap 500 includes a plurality of directional members 510 formed at regular intervals. In the above description, the strap 500 is made of an elastic material so that it may not be easily broken even during repeated unwinding and rewinding. It is characterized by a low modulus of elasticity.

In other words, the strap 500 may be composed of a base 501 made of an elastic material and a directional member 510 . At this time, the base 501 may be a basic configuration of the strap 500 , The basic elastic material constituting the 500 may be referred to as the base 501 .

Furthermore, the directional member 510 is based on a lower elastic modulus than the base 501 , and is formed on the surface of the base 501 in the winding direction of the rotation shaft 300 . In this case, the directional member 510 preferably has a 'V' shape, so the directional member 510 having a 'V' shape may point in a specific direction like an arrow.

At this time, preferably, in other words, since the directional member 510 has a 'V' shape, the ends of the directional member 510 are directed toward the winding direction of the rotation shaft 300 , rather than both ends of the two forked ends.

Furthermore, a plurality of directional members 510 are formed at regular intervals on the surface of the base 501 , that is, the directional members 510 may be patterned at regular intervals on the surface of the base 501 .

To this end, the directional member 510, such as a block made of an elastic material, is placed on the surface of the base 501 and thermocompression-bonded so that the directional member 510 is flatly attached to the base 501 and The height difference of the directional member 510 may be minimized and the base 501 and the directional member 510 may be formed on the same surface. Alternatively, it is also possible to pattern the resin in the shape of the directional member 510 on the surface of the base 501, or after forming a through hole according to the shape of the directional member 510 on the surface of the base 501, It goes without saying that the directional member 510 may be filled with a resin.

Therefore, since the wedge-shaped directional member 510 facing the winding direction has a lower elastic modulus than the base 501, it has a shape that is easily stretched by the user's pulling operation. can be different. In other words, the force is gathered at the center of the directional member 510 having a wedge shape, and the center of the directional member 510, which is stretched due to the force gathered during the pulling operation (unwinding), is reduced during the pulling (unwinding) and absorbs the force. and then consume it.

This occurs in the entire strap 500 made of an elastic material, but in the case of the directional member 510 , which has a lower elastic modulus than the base 501 , which is elastically deformed more easily, the strain rate that is stretched during the pulling operation and then reduced by the pulling release It is also higher than the base 501, and through this, the energy emitted by the flywheel 400 when the pulling is released is partially offset, thereby preventing rapid stretch contraction from occurring.

Furthermore, in an exercise device that is generally gripped with both arms or held with one arm and moved, there is a high possibility that the force is concentrated on the central part, which is also the center through the shape of the directional member 510 having the ends gathered in the wedge direction. The force driven by the directional member 510 can be canceled through the elastic deformation at the gathered end of the directional member 510, so that when the winding is released by the pulling operation, the flywheel partially offsets through the directional member 510 toward the winding direction By preventing excessive energy from being stored in 400 and reducing the amount of energy emitted by the flywheel 400 through it, it is possible to once more prevent rapid stretch contraction from occurring.

The strength exercise device of the present invention as described above is capable of offsetting the speed difference between unwinding and winding of the strap 500 through the directional member 510 formed on the surface of the strap 500 as well as the brake 600 . , by controlling the speed difference between the uniaxial contraction that occurs during the user's pulling operation and the stretchable contraction that occurs during the releasing operation of the user, it has the effect of preventing injuries that may occur due to the rapid stretching contraction.

7 is a conceptual diagram illustrating an enlarged directional member.

Further, looking at the directional member in an enlarged view, the directional member 510 of the present invention may be made of the same material, but has a dual structure including the first member 511 and the second member 512, or the first member ( 511 ), the second member 512 , and the third member 513 may have a triple structure.

As an embodiment, a directional member having a dual structure including the first and second members 511 and 512 will be described with FIG. has This is the same as the structure of the basic directional member 510, and it can be said that the shape of the directional member 510 is also the same.

A second member 512 may be included in the outer side of the first member 511 , that is, in the circumferential portion in the winding direction, wherein the second member has a lower first elastic modulus than the first elastic modulus of the first member 511 , It is characterized in that it has a modulus of elasticity of 2.

Therefore, according to the directional member 510 of such a double structure, more elastic deformation is made in the circumferential portion in the winding direction, thereby strengthening the effect that the strap 500 absorbs energy during the pulling and releasing operation, The effect of preventing the instantaneous strong energy from being emitted from the flywheel 400 is enhanced.

Furthermore, according to this structure, since elastic deformation in the circumferential portion of the directional member 510 in the winding direction is strengthened, the energy offset effect in the direction indicated by the vector sum of the directional member 510 having a wedge shape, that is, the unwinding direction. can be strengthened Therefore, it is of course possible to further enhance the effect of preventing excessive energy from being stored in the flywheel 400 by partially offsetting through the directional member 510 facing the winding direction when unwinding by the pulling operation.

Furthermore, referring to FIG. 7(b) , the directional member 510 further includes a third member 513 located on the opposite side of the above-described second member 512, that is, at a peripheral portion in the unwinding direction. can do.

In this case, the third member has a third modulus of elasticity higher than that of the base 501, and through this, it is possible to prevent the directional member 510 included in the strap 500 from being excessively elastically deformed during the pulling operation, and the directional member Of course, it is possible to minimize permanent deformation due to repeated contraction/extension of the 510 .

Further, the directional member 510 including the first, second, and third members 511, 512, and 513 is a thermoplastic elastomer (TPE), nitrile-butadiene rubber, like the basic material of the strap 500 described above. NBR), polyvinyl chloride (PVC), may be made of a material containing at least one of ethylene vinyl acetate (EVA), and in this case, elasticity through the addition of additives or control of the number average molecular weight The coefficient may be raised or lowered.

Therefore, according to the directional member 510 of the double structure, furthermore, the triple structure, the effect of strengthening the energy offset effect in the unwinding direction to prevent the rapid stretch contraction from occurring, and at the same time, the repeated contraction / contraction of the directional member Of course, it is possible to minimize permanent deformation due to elongation.

In addition, the above-described third member 513 is said to have a higher elastic modulus than the base 501, thereby preventing excessive elastic deformation and minimizing permanent deformation that may occur due to repeated elastic deformation.

The material constituting the third member 513 may preferably be a mixture of 85 to 99 parts by weight of the elastic base and 1 to 15 parts by weight of the deformation preventing agent.

At this time, as described above, the elastic base is made of thermoplastic elastomer (TPE), nitrile-butadiene rubber (NBR), polyvinyl chloride (PVC), and ethylene vinyl acetate (EVA). Of course, an elastic material that includes at least one, but not mentioned, may also be employed as an elastic base.

The anti-deformation agent includes chlorosulphonated polyethylene as an active ingredient. Chlorosulfonated polyethylene is a type of rubber having a chlorine group (-Cl) as a functional group. It has the effect of increasing the modulus of elasticity.

Accordingly, the elastic modulus of the third member 513 is increased according to the addition of the anti-deformation agent, thereby preventing an excessive level of elastic deformation and minimizing permanent deformation that may occur due to repeated elastic deformation.

In this case, more preferably, the anti-deformation agent may further include an additional composition in addition to the chlorosulfonated polyethylene, and the anti-deformation agent may be prepared by the following method.

8 is a flowchart showing the steps of preparing the anti-deformation agent.

Referring to FIG. 8 , the anti-deformation agent of the present invention is to be manufactured through the steps of preparing a primary material (S11), preparing a secondary material (S12), and completing the anti-deformation agent (S13). can

(S11) step of preparing the primary material

First, 20 to 35 parts by weight of chlorosulfonated polyethylene, 3 to 10 parts by weight of sodium azide, 50 to 80 parts by weight of tetrahydrofuran, and 70 to 130 ℃ for 1 to 3 hours The primary material is prepared by stirring.

Chlorosulfonated polyethylene is said to have excellent mechanical properties and high elasticity as described above, and tetrahydrofuran is an amphoteric solvent with excellent solubility in both polar and non-polar materials. For dissolving chlorosulfonated polyethylene and sodium azide, is added

Sodium azide serves to provide an azide group to the chlorosulfonated polyethylene so that some chlorine groups contained in the chlorosulfonated polyethylene can be substituted with an azide group. Furthermore, heating and stirring are performed to induce a substitution reaction of such an azide group.

The primary material prepared through this is tetrahydrofuran mixed with chlorosulfonated polyethylene, and furthermore, some chlorine groups of chlorosulfonated polyethylene are substituted with azide groups to show a composite resin composition, thereby strengthening elastic restoring force and mechanical properties. .

(S12) preparing a secondary material

Then, 75 to 90 parts by weight of the primary material, 1 to 10 parts by weight of Formaldehyde/Melamine/Tosylamide Copolymer, and 5 to 15 parts by weight of tin oxide powder are mixed to form 2 manufactures tea material.

The formaldehyde-melamine-tosylamide copolymer added at this time is a kind of film-forming agent, which promotes curing of the composition of the third member 513 to which the deformation inhibitor is added, prevents cracks and cracks, and further increases the surface strength. It has the function of strengthening the deformation prevention effect.

Tin oxide powder is a granular material prepared by pulverizing tin oxide, and tin (II) oxide and tin (IV) oxide exist, and the tin oxide of the present invention may preferably be tin (IV) oxide. It serves as an inorganic filler to increase the anti-deformation effect by improving the surface strength, and at the same time increase the corrosion resistance of the composition of the third member 513 containing the anti-deformation agent and lower the electrical conductivity to suppress the generation of static electricity on the surface, It performs a function to prevent corrosion even when it is used repeatedly and in contact with body fluids.

(S13) step of completing the anti-deformation agent

Finally, 90 to 99 parts by weight of the secondary material, 1 to 5 parts by weight of tetraethylammonium hydroxide, and 1 to 5 parts by weight of a physical property retaining agent comprising polymethylsilsesquioxane Mix to complete the anti-strain agent.

Tetraethylammonium hydroxide is a substance added to increase the mutual repulsion force between particles so that various substances included in the deformation inhibitor, especially granular tin oxide powder, can be stably dispersed in the liquid deformation inhibitor without agglomeration or sinking. to be.

Furthermore, polymethylsilsesquioxane, an active ingredient of the physical property maintenance agent, is a high molecular compound having a main skeleton by siloxane bonds, and is a material having water repellency and waterproof properties, and weather resistance and chemical resistance, and the strength exercise device of the present invention is used. In the present invention, even if the body fluid such as sweat generated by the user repeatedly contacts the third member 513, the body fluid is prevented from penetrating therein, and furthermore, the third member 513 is formed due to the body fluid containing the salt. It performs a function to prevent deterioration of physical properties.

Therefore, in the case of the third member 513 including such a deformation inhibitor, it exhibits a high level of mechanical strength and elasticity, prevents excessive deformation, and minimizes permanent deformation that may occur due to repeated contraction/extension, and further Such physical properties have characteristics that allow them to be maintained for a long time even when used repeatedly or in contact with body fluids.

In order to explain the function of the anti-deformation agent of the present invention, the evaluation results of Examples 1 and 2 and Comparative Examples will be compared and described.

Examples 1 and 2 consist of preferred Examples 1 and 2 containing the deformation inhibitor of the present invention, and Comparative Examples are conventional resins.

<Example 1>

30 g of chlorosulfonated polyethylene, 5 g of sodium azide, and 65 g of tetrahydrofuran were mixed and stirred at 100° C. for 2 hours to prepare 100 g of a primary material.

85 g of the prepared primary material, 5 g of formaldehyde/melamine/tosylamide copolymer, and 10 g of tin oxide powder were mixed to prepare 100 g of a secondary material.

95 g of the prepared secondary material, 2 g of tetraethylammonium hydroxide, and 3 g of polymethylsilsesquioxane were mixed to prepare 100 g of an anti-deformation agent.

A resin composition containing 10% by weight of the deformation inhibitor was prepared by mixing the deformation inhibitor prepared in the polyvinyl chloride resin, and this was molded into a pad shape having a width of 10 cm, a length of 10 cm, and a thickness of 1 cm.

<Example 2>

100 g of chlorosulfonated polyethylene was prepared as a deformation inhibitor.

A resin composition containing 10% by weight of the deformation inhibitor was prepared by mixing the deformation inhibitor prepared in the polyvinyl chloride resin, and this was molded into a pad shape having a width of 10 cm, a length of 10 cm, and a thickness of 1 cm.

<Comparative example>

A conventional polyvinyl chloride resin was molded into a pad shape having a width of 10 cm, a length of 10 cm, and a thickness of 1 cm.

In this case, the composition ratios of Examples 1 to 2 and Comparative Examples described above are shown in Table 1 below. Here, the unit of each value is % by weight.

Example 1 Example 2 comparative example Chlorosulfonated Polyethylene 2.42 10.00 - sodium azide 0.40 - - tetrahydrofuran 5.25 - - Formaldehyde/melamine/tosylamide copolymer 0.48 - - tin oxide powder 0.95 - - tetraethylammonium hydroxide 0.20 - - Polymethylsilsesquioxane 0.30 - - polyvinyl chloride resin 90.00 90.00 100.00

Tests were performed on the prepared pads of Examples 1 and 2 and the polyvinyl chloride pads of Comparative Examples.

1. Mechanical properties: To measure mechanical properties, the tensile strength at break was measured according to ASTM D638 (50 mm/min).

2. Tear strength: According to ASTM D624, tear strength was measured using the Trouser method among "Tear Strength - ASTM D624 Plastic Test Standard".

3. Hardness: The hardness was measured using a Shore hardness tester (TELCLOCK Type A) in accordance with ASTM D2240.

4. Restoration rate: After applying a force of 10N using a UTM (Universal Testing Machine), the restoration rate was measured using the thickness recovered within 10 seconds.

5. Rebound resilience: In order to measure the property of returning to the original shape, the average value of 5 repeated tests in accordance with KS M ISO 8307 was measured.

6. Permanent compression set rate: In order to measure the degree of not returning to the original shape, the compression set rate was measured according to KS M 6518.

Table 2 is a table showing the test results of mechanical properties, tear strength, hardness, recovery rate, rebound elasticity, and permanent compression set. Example 1 Example 2 comparative example Tensile strength (psi) 1862 1854 1824 tear strength (pli) 269 262 242 Hardness (Shore A Type) 90 88 80 Restoration rate (%) 96 90 84 Rebound elasticity (%) 82 75 67 Permanent compression set (%) One 3 10

As can be seen from Table 1, it can be seen that Examples 1 and 2 of the present invention are generally superior in tensile strength, tear strength, hardness, recovery rate, rebound elasticity, and permanent compression set reduction compared to Comparative Examples.

Further, through comparison between Example 1 and Example 2, Example 1, which was made of a mixture composition of a variety of materials than Example 2 using chlorosulfonated polyethylene alone, had tensile strength, tear strength, hardness, recovery rate, and rebound elasticity. , it can be confirmed that the physical properties including the permanent compression set are more excellent.

In addition, the above-described physical property retaining agent may further include an additional composition in addition to polymethylsilsesquioxane, and a method for preparing such a physical property retaining agent will be described with the drawings as follows.

9 is a flowchart showing the steps of preparing a physical property maintenance agent.

Referring to FIG. 9 , the physical property maintenance agent of the present invention comprises a step of preparing a first material (S21), a step of preparing a second material (S22), and a step of completing the physical property maintenance agent (S23). can be manufactured.

(S21) preparing a first material

15 to 25 parts by weight of polymethylsilsesquioxane, 5 to 15 parts by weight of Zerumbone, and 50 to 80 parts by weight of ethanol are mixed at 60 to 70° C. to prepare a first material.

Here, as in the above description, polymethylsilsesquioxane is a high molecular compound having a main skeleton by a siloxane bond, and is a material having water repellency and waterproof properties, and weather resistance and chemical resistance, and ethanol is a solvent of the first material. is added

Xerumbon is one of the sesquiterpene ketones and is a substance present in the essential oil of the rhizome of the ginger family. It can be dissolved using ethanol as a solvent, but the solubility is not high, and it is known that the melting point is 60° C. or higher, so a slight heating, that is, heating of 60 to 70° C., may be accompanied for dissolution of xerumbone.

This Xerumbon exhibits an effect as a strong antioxidant, and thus performs a function of preventing oxidation of the composition of the third member 513 to which the deformation inhibitor is added, and furthermore, the deformation inhibitor is added.

(S22) preparing a second material

Then, 80 to 95 parts by weight of the first material, 5 to 15 parts by weight of sodium polyacrylate, and 1 to 5 parts by weight of chitosan propylsulfonate are mixed to prepare a second material.

Sodium polyacrylate is a kind of food additive for increasing the adhesion and viscosity of food, enhancing emulsion stability, and improving the physical properties and feel of food. It is a substance added to offset the

Chitosan propyl sulfonate is a type of surfactant, and is added to enhance the mixability between various compositions included in the physical property maintenance agent and furthermore the deformation inhibitor to help stabilize it.

(S23) Step of completing the physical property maintenance agent

Finally, 90 to 99 parts by weight of the second material, 0.5 to 3 parts by weight of 8-Oxo Deoxyguanosine, and 1 to 5 parts by weight of Astragalin are mixed to complete a physical property maintenance agent do.

8-oxo deoxyguanosine takes a form in which one more monoatomic oxygen is combined with deoxyguanosine.

Astragalin is a natural substance extracted from persimmon leaves, mulberry leaves, red grapes, and bracken, and is a glycoside in which glucose is bound to kaempferol, a kind of polyphenol. It is known to have an antioxidant effect, so it can support the antioxidant effect of 8-oxo deoxyguanosine, thereby maximizing the effect of maintaining physical properties.

According to such a physical property retaining agent, it is possible to strongly prevent oxidation of the surface of the composition of the third member 513 that is not easily in contact with body fluids, including a large number of strong antioxidants, and at the same time to prevent a decrease in viscosity due to the addition of the physical property retaining agent. In addition, it is possible to provide a complex function that can provide water repellency and weather resistance at the same time.

As described so far, the configuration and action of the muscle strength exercise device in which the resistance deviation according to the present invention is alleviated is expressed in the above description and drawings, but this is merely an example and the spirit of the present invention is not limited to the above description and drawings. It goes without saying that various changes and modifications are possible within the scope without departing from the technical spirit of the present invention.

100: housing 200: frame
210: connector 220: flywheel cover
230: flywheel auxiliary cover 240: conductor member cover
250: conductive member auxiliary cover 260: first reinforcing member
270: second reinforcing member 280: first bearing
290: second bearing 300: rotation shaft
301: bobbin 310: first fixing bar
320: second fixing bar 400: flywheel
410: first fixing hole 500: strap
510: directional member 511: first member
512: second member 513: third member
600: brake 610: conductor member
611: second fixing hole 620: magnetic member
700: handle

Claims (6)

As a strength exercise device with reduced resistance variation,
frame;
a rotating shaft rotatably provided on the frame;
a flywheel provided on the rotating shaft to generate a moment of inertia according to the rotation of the rotating shaft;
a brake provided on the rotation shaft to provide rotation resistance of the rotation shaft;
As to rotate the rotation shaft by being unwound or wound on the rotation shaft by a pulling or unwinding operation, a base made of an elastic material, and a modulus of elasticity lower than that of the base, from the surface of the base toward the winding direction of the rotation shaft at a predetermined interval A strap including a 'V'-shaped directional member formed in plurality with a
The directional member,
A first member having a first modulus of elasticity lower than the modulus of elasticity of the base, and a second member positioned outside the first member in a circumferential portion in the winding direction and having a second modulus of elasticity lower than the first modulus of elasticity and a third member positioned at a circumferential portion of the unwinding direction opposite to the second member and having a third modulus of elasticity higher than that of the base,
The third member is
Containing a deformation inhibitor comprising chlorosulfonated polyethylene (chlorosulphonated polyethylene),
The anti-deformation agent,
20 to 35 parts by weight of the chlorosulfonated polyethylene, 3 to 10 parts by weight of sodium azide, and 50 to 80 parts by weight of tetrahydrofuran are mixed and stirred at 70 to 130° C. for 1 to 3 hours. preparing a primary material;
75 to 90 parts by weight of the primary material, 1 to 10 parts by weight of formaldehyde/melamine/tosylamide copolymer, and 5 to 15 parts by weight of tin oxide powder preparing a material;
90 to 99 parts by weight of the secondary material, 1 to 5 parts by weight of tetraethylammonium hydroxide, and 1 to 5 parts by weight of a physical property retaining agent comprising polymethylsilsesquioxane Completing the anti-strain agent; characterized in that manufactured through, strength exercise device. The method of claim 1,
The physical property maintenance agent,
Preparing a first material by mixing 15 to 25 parts by weight of the polymethylsilsesquioxane, 5 to 15 parts by weight of Zerumbone, and 50 to 80 parts by weight of ethanol at 60 to 70° C.;
80 to 95 parts by weight of the first material, 5 to 15 parts by weight of sodium polyacrylate, and 1 to 5 parts by weight of chitosan propylsulfonate to prepare a second material;
Completing the physical property maintenance agent by mixing 90 to 99 parts by weight of the second material, 0.5 to 3 parts by weight of 8-Oxo Deoxyguanosine, and 1 to 5 parts by weight of Astragalin ; Characterized in that manufactured through, strength exercise device. delete delete delete delete

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