CN217854309U

CN217854309U - Strength adjusting mechanism and chest expander

Info

Publication number: CN217854309U
Application number: CN202221419991.3U
Authority: CN
Inventors: 王英梅; 刘翼茜; 刘博朗; 刘翼菲; 陈柳伊
Original assignee: Killer Whale Yongkang Intelligent Technology Co ltd
Current assignee: Killer Whale Yongkang Intelligent Technology Co ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-11-22
Anticipated expiration: 2032-06-08

Abstract

The utility model discloses a strength adjustment mechanism and chest expander, include: the shell comprises a fixed shell and a gear adjusting shell; the pull rope winding device comprises a first shaft, a contraction barrel sleeved on the first shaft, a pull rope and a coil spring wound on the contraction barrel, and a one-way assembly sleeved on the first shaft and synchronously rotating with the contraction barrel; the tension adjusting device comprises a second shaft, a transmission assembly, a pressure spring and a pressing assembly, wherein the transmission assembly is sleeved on the second shaft and connected with the gear adjusting shell, the pressure spring is connected with the transmission assembly, and the pressing assembly is connected with the pressure spring and can restrain the rotation of the one-way assembly. The utility model discloses an one-way subassembly has the synchronous unidirectional rotation of a shrink section of thick bamboo of stay cord with the coiling, and one-way subassembly with compress tightly the subassembly and link to each other to the stay cord receives the restraint of compressing tightly the subassembly when tensile and has certain resistance, and the stay cord then can not order about one-way subassembly and compress tightly the rotation of subassembly when receiving and restoring, consequently the utility model discloses can make the tensile resistance of stay cord adjustable, can not hinder the stay cord again and receive and restore, stability is good.

Description

Strength adjusting mechanism and chest expander

Technical Field

The utility model relates to a body-building apparatus technical field, concretely relates to strength adjustment mechanism and chest expander.

Background

With the development of the times, the chest expander also starts to be a fashionable road. The clumsy chest developer can only be suitable for being used at home, cannot meet the requirements of people for exercising at any time and any place, has poor portability, and has great danger in the using process. The chest expander is safer and convenient to use, and can meet the requirements of people. The portable chest expander gradually forms trend, and more people with still-fitting body-building begin to use the portable chest expander. The chest expander becomes a new favorite which people carry with. The chest developer is an apparatus suitable for mass body building and exercising, and can be divided into common spring chest developers, various chest developers with handles, elastic rope chest developers, pedal chest developers and the like, wherein the common spring chest developers can adjust the tension through replacing springs, and the common spring chest developers especially pay attention to checking whether the hooks and the springs are firm and well hung, so that the springs are prevented from being separated from the hooks during exercising, and the springs are thrown to users, thereby causing danger.

The prior art discloses an adjustable chest expander (with an authorization notice number of CN 214512465U), which comprises a fixing device which can be connected with the outside, a shell which is connected with the fixing device, a pull rope mechanism which is arranged in the shell, and a handheld part which extends out of the shell, wherein the pull rope mechanism at least comprises a first coil spring unit, a second coil spring unit and a sleeve which is used for winding the pull rope, and the center of the sleeve extends to form a left lengthened section; the second coil spring unit comprises a second coil spring sleeved on the left lengthened section and one end of the second coil spring is connected with the left lengthened section, and a first locking mechanism connected with the other end of the second coil spring; when the first locking mechanism locks or unlocks the other end of the second coil spring, the first coil spring and the second coil spring of the first coil spring unit can be used in combination to adjust the force required to pull the pull rope. Above-mentioned the utility model discloses have the design of a plurality of coil spring units to when the user adjusted the pulling force size, need the different coil spring units of stack use, and probably receive the hindrance of coil spring unit when the stay cord replies, tensile or receive compound poor stability.

Disclosure of Invention

The utility model provides a strength adjustment mechanism and chest expander to not enough among the prior art. The utility model discloses an one-way subassembly has the synchronous unidirectional rotation of a shrink section of thick bamboo of stay cord with the coiling, and one-way subassembly with compress tightly the subassembly and link to each other to the stay cord receives the restraint of compressing tightly the subassembly and has certain resistance when tensile, and the stay cord then can not order about one-way subassembly and compress tightly the rotation of subassembly when receiving again, consequently the utility model discloses can make the tensile resistance of stay cord adjustable, can not hinder the stay cord again and receive again, stability is good.

The utility model discloses a following technical scheme can solve:

a force adjustment mechanism comprising: the gear adjusting mechanism comprises a shell, a gear adjusting mechanism and a gear adjusting mechanism, wherein the shell is provided with a hollow cavity and comprises a fixed shell and a gear adjusting shell which is connected with the fixed shell to form the hollow cavity and can rotate relative to the fixed shell;

the pull rope winding device comprises a first shaft positioned in the hollow cavity, a contraction barrel sleeved on the first shaft, a pull rope and a coil spring wound on the contraction barrel, and a one-way assembly sleeved on the first shaft and/or the contraction barrel and synchronously rotating with the contraction barrel;

the tension adjusting device comprises a second shaft, a transmission assembly, a pressure spring and a pressing assembly, wherein the second shaft is located in the hollow cavity and is rotatably connected with one end of the first shaft, the transmission assembly is sleeved on the second shaft and is connected with the gear adjusting shell, the pressure spring is connected with the transmission assembly, and the pressing assembly is connected with the pressure spring and can restrict the rotation of the one-way assembly.

Preferably, the retraction cylinder comprises a first connection structure for the first shaft to pass through, a second connection structure located on the periphery of the first connection structure and used for the pull rope to wind, and a third connection structure located on the side, far away from the one-way component, of the first connection structure and the second connection structure, and the coil spring is wound in the third connection structure;

the first connecting structure and the second connecting structure are separated to form a connecting groove, and part or all of the unidirectional assemblies are connected in the connecting groove.

Preferably, the one-way assembly comprises a one-way bearing sleeved on the periphery of the first connecting structure and a one-way shaft sleeve connected with the one-way bearing; the inner periphery of the first connecting structure is provided with a rotating bearing which is sleeved on the first shaft and has the same axle center with the one-way bearing.

Preferably, the one-way shaft sleeve comprises a first sleeving structure for the first shaft to penetrate through, a second sleeving structure located on the periphery of the first sleeving structure and connected with the compressing assembly, and a third sleeving structure located on the side, far away from the compressing assembly, of the first sleeving structure and the second sleeving structure, and the third sleeving structure is located in the connecting groove and connected with the one-way bearing.

Preferably, the side of the coil spring, which is far away from the one-way shaft sleeve, is provided with a fixing assembly for limiting the displacement of the coil spring;

the fixing assembly comprises a coil spring fixing head sleeved on the first shaft and a coil spring fixing plate sleeved on the coil spring fixing head, the coil spring fixing plate is matched with the third connecting structure and seals a connecting cavity of the coil spring in the third connecting structure, one end of the coil spring fixing head is located in the connecting cavity, and the other end of the coil spring fixing head is connected with the fixing shell.

Preferably, the fixed shell comprises a first fixed sleeve connected with the coil spring fixed head, a pull rope sleeve connected with the first fixed sleeve and arranged corresponding to the pull rope, and a second fixed sleeve connected with the pull rope sleeve and rotationally connected with the gear adjusting shell.

Preferably, the pressing assembly comprises a first pressing member connected with the pressing spring, a second pressing member arranged separately from the first pressing member, and a clamping piece positioned between the first pressing member and the second pressing member and connected with the third sleeving structure; the first pressing component and the second pressing component are sleeved and connected on the second shaft;

when the transmission assembly presses the compression spring, the first pressing member is pressed and displaced towards the direction close to the second pressing member, and the first pressing member and/or the second pressing member are/is connected with the clamping piece in an abutting mode.

Preferably, the first pressing member comprises a first blocking piece abutting against the pressure spring and a first gasket abutting against the side, far away from the pressure spring, of the first blocking piece; the second pressing member comprises a second baffle and a second gasket which is abutted against the side, far away from the pressure spring, of the second baffle; and the first gasket and the second gasket can respectively lean against and rub against the two outer sides of the clamping piece.

Preferably, the inner side of the gear adjusting shell is provided with a first adjusting part connected with the second shaft and a second adjusting part which is positioned on the periphery of the first adjusting part and can drive the transmission assembly to axially move; and a plurality of gear clamping grooves for the transmission assembly to move are formed in the periphery of the second shaft.

A chest developer, comprising: the force adjusting mechanism is provided with at least one pair;

and the two force adjusting mechanisms are respectively arranged on two sides of the supporting structure.

The utility model discloses the main beneficial effect who gains as follows:

the utility model discloses in, when the user need adjust the dynamics of stay cord when tensile, the user need rotate the gear earlier and adjust the shell to impel drive assembly cavity indoor motion towards, and drive assembly inwards extrudees the pressure spring again, and the pressure spring orders about and compresses tightly the subassembly and closely supports to lean on or be connected with one-way subassembly, thereby compresses tightly the frictional force increase between subassembly and the one-way subassembly, hinders the rotation of one-way subassembly. When the user outwards stretches the stay cord, the pulling force of stay cord orders about a shrink section of thick bamboo and rotates, and meanwhile the rotation of a shrink section of thick bamboo will drive the coil spring at a shrink section of thick bamboo internal rotation, and drive the rotation of one-way subassembly in step, according to the principle of the tensile dynamics of aforesaid regulation, learn through adjusting the gear adjusting shell, can be so that compress tightly the frictional force increase between subassembly and the one-way subassembly or reduce, when the frictional force increase, the user is hard when the pulling stay cord, when the frictional force reduces, the user is laborsaving when the pulling stay cord. When the stay cord is inwards recovered, the coil spring can exert the recovery force of the coil spring to drive the contraction cylinder to rotate, so that the stay cord is inwards folded, the one-way assembly cannot be reversely rotated, the one-way assembly cannot be synchronously driven to rotate when the contraction cylinder rotates, the compression assembly cannot block the one-way assembly, the stay cord is free of friction resistance when being recovered, and the recovery of the stay cord is smooth and stable.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic view of an overall structure of a force adjustment mechanism according to an embodiment of the present invention.

Fig. 2 is an exploded schematic view of a force adjustment mechanism according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a force adjustment mechanism according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a retraction cylinder, pull cord and coil spring according to an embodiment of the present invention.

Fig. 5 is another schematic view of a retraction cylinder, pull cord and wrap spring as disclosed in one embodiment of the present invention.

Fig. 6 is a schematic view of a unidirectional assembly according to an embodiment of the present invention.

Fig. 7 is a schematic view of a coil spring fixing head and a coil spring fixing plate according to an embodiment of the present invention.

Fig. 8 is a schematic view of a first pressing member, a second pressing member and a clamping member according to an embodiment of the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention will be combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

As shown in fig. 1-8, as an embodiment of the present invention, a strength adjustment mechanism is disclosed, which is mainly used for body-building people to exercise limbs, and comprises a housing 1, a rope winding device 2 and a tension adjustment device 3, wherein the housing has a hollow chamber 100, the rope winding device 2 and the tension adjustment device 3 are accommodated in the hollow chamber 100, and the housing 1 comprises a fixing shell 11 and a gear adjustment shell 12 connected with the fixing shell 11 to form the hollow chamber 100 and capable of rotating relative to the fixing shell 11, during the actual use, the user can rotate the gear adjustment shell 12 to adjust a suitable resistance gear, and the fixing shell 11 does not rotate relative to the gear adjustment shell 12. The pull rope winding device 2 includes a first shaft 21 located in the hollow chamber 100, a contraction cylinder 22 sleeved on the first shaft 21, a pull rope 23 and a coil spring 24 wound on the contraction cylinder 22, and a one-way component 25 sleeved on the first shaft 21 and/or the contraction cylinder 22 and rotating synchronously with the contraction cylinder 22, in the utility model, the first shaft 21 is arranged along the length direction of the hollow chamber 100 and is used for rotating the contraction cylinder 22 and the one-way component 25, the contraction cylinder 22 is sleeved on the first shaft 21, the pull rope 23 and the coil spring 24 are arranged on the contraction cylinder 22, a user can pull the pull rope 23 or release the pull rope 23 outwards, and the coil spring 24 is a structure capable of continuously providing a larger restoring force in a narrow space, and can return the component to the original position after one stroke of the mechanical component is completed so as to prepare the next stroke and have a strong restoring force, in addition, the one-way component 25 is sleeved on the first shaft 21 or the contraction cylinder 22, it needs to be stated that the one-way component 25 can only rotate in one direction, and can not be reversed, and the one-way component 25 and can be directly connected with the first shaft 21 or the contraction cylinder 22 and can be connected with each other in a part of the contraction cylinder. Therefore, in actual use, when the user pulls the pulling rope 23 outward, the pulling force of the pulling rope 23 drives the retraction cylinder 22 to rotate relative to the first shaft 21, and at the same time, the rotation of the retraction cylinder 22 will drive the coil spring 24 to rotate in the retraction cylinder 24, and simultaneously drive the rotation of the one-way component 25, it should be noted that the coil spring 24 will store a certain retraction force during the rotation, so as to retract the pulling rope 23. In addition, the pulling force adjusting device 3 includes a second shaft 31 located in the hollow chamber 100 and rotatably connected to one end of the first shaft 21, a transmission component 32 sleeved on the second shaft 31 and connected to the shift position adjusting housing 12, a compression spring 33 connected to the transmission component 32, and a compression component 34 connected to the compression spring 33 and capable of restricting rotation of the one-way component 25, in the present invention, the second shaft 31 is disposed along a length direction of the hollow chamber 100, one end of the second shaft 31 is connected to the shift position adjusting housing 12, the other end of the second shaft is connected to the first shaft 21, and the transmission component 32 is also connected to the shift position adjusting housing 12, so that when the shift position adjusting housing 12 is rotated by a user, the transmission component 32 is actuated, the compression spring 33 is connected between the compression component 34 and the transmission component 32, and has functions of buffering and transmitting driving force, and the compression component 34 is also sleeved on the second shaft 31, and is mainly used for restricting rotation of the one-way component 25 and has a restriction force on the one-way component 25, so that when the pulling rope 23 is pulled, the one-way component 25 has resistance due to the compression component 34, and cannot easily pull the pulling rope 23. When the user needs to adjust the tensile force of stay cord 23, the user needs to rotate gear adjusting shell 12 earlier to impel drive assembly 32 to move towards cavity 100, and drive assembly 32 inwards extrudes pressure spring 33 again, and pressure spring 33 drives and compresses tightly subassembly 34 and one-way component 25 and closely supports or is connected, thereby compresses tightly the frictional force increase between subassembly 34 and the one-way component 25, hinders the rotation of one-way component 25. When the user outwards stretches stay cord 23, the pulling force of stay cord 23 orders about shrink section of thick bamboo 22 and rotates, meanwhile shrink section of thick bamboo 22's rotation will drive coil spring 24 at shrink section of thick bamboo 24 internal rotation, and drive the rotation of one-way subassembly 25 in step, according to the principle of the tensile dynamics of the aforesaid regulation, learn to adjust shell 12 through adjusting the gear, can make the frictional force increase or reduce that compresses tightly between subassembly 34 and the one-way subassembly 25, when frictional force increase, the user is hard when pulling stay cord 23, when frictional force reduces, the user is laborsaving when pulling stay cord 23. When the pull rope 23 is retracted inwards, the coil spring 24 exerts the retracting force thereof to drive the retraction cylinder 22 to rotate, so that the pull rope 23 is retracted inwards, the one-way component 25 cannot be reversed, the one-way component 25 cannot be synchronously driven to rotate when the retraction cylinder 22 rotates, the pressing component 34 cannot block the one-way component 25, the pull rope 23 has no friction resistance when retracted, and the retraction of the pull rope is smooth and stable.

As another embodiment of the present invention, the retraction cylinder 22 includes a first connection structure 221 for the first shaft 21 to pass through, a second connection structure 222 located at the periphery of the first connection structure 221 for the pulling rope 23 to wind, and a third connection structure 223 located at the side of the first connection structure 221 and the second connection structure 222 away from the one-way component 25, and the coil spring 24 is wound in the third connection structure 223; in addition, the first connection structure 221 and the second connection structure 222 are separated to form a connection groove 224, and part or all of the unidirectional elements are connected in the connection groove 224. Therefore, in the present invention, the retraction cylinder 22 is connected by the first connection structure 221, the second connection structure 222 and the third connection structure 223 to form an integral structure, and the pull rope 23, the coil spring 24 and the one-way component 25 are respectively connected, so that the structure is not obstructed, and the stability is improved.

As another embodiment of the present invention, the one-way component 25 includes a one-way bearing 251 sleeved on the periphery of the first connecting structure 221, and a one-way shaft sleeve 252 connected to the one-way bearing 251; the inner periphery of the first connecting structure 221 is provided with a rotating bearing which is sleeved on the first shaft 21 and coaxial with the one-way bearing 251. As another embodiment of the present invention, the unidirectional shaft sleeve 252 includes a first sleeve structure 2521 for the first shaft 21 to pass through, a second sleeve structure 2522 located at the periphery of the first sleeve structure 2521 and connected to the pressing component 34, and a third sleeve structure 2523 located at the periphery of the first sleeve structure 2521 and the second sleeve structure 2522 and far away from the pressing component 34, wherein the third sleeve structure 2523 is located in the connecting groove 224 and connected to the unidirectional bearing 251, and therefore, the utility model discloses a third sleeve structure 2523 and the unidirectional bearing 251 are accommodated in the connecting groove 224 and can rotate synchronously with the first sleeve structure 221 again, the structure arrangement is reasonable, the space utilization is high, so that the whole device is small and exquisite, and is convenient for a user to go out for carrying and using.

As another embodiment of the present invention, the side of the coil spring 24 away from the one-way shaft sleeve 252 is provided with a fixing component for limiting the displacement of the coil spring 24; the fixing component comprises a coil spring fixing head 261 sleeved on the first shaft 21 and a coil spring fixing plate 262 sleeved on the coil spring fixing head 261, the coil spring fixing plate 262 is matched with the third connecting structure 223 and seals a connecting cavity of the coil spring 24 positioned in the third connecting structure 223, one end of the coil spring fixing head 261 is positioned in the connecting cavity, and the other end of the coil spring fixing head 261 is connected with the fixing shell 11. As another embodiment of the present invention, the fixing case 11 includes a first fixing sleeve 111 connected to the coil spring fixing head 261, a rope sleeve 112 connected to the first fixing sleeve 111 and arranged in correspondence with the rope 23, and a second fixing sleeve 113 connected to the rope sleeve 112 and rotatably connected to the shift position adjusting case 12.

As another embodiment of the present invention, the pressing assembly 34 includes a first pressing member 341 connected to the pressing spring 24, a second pressing member 342 spaced apart from the first pressing member 341, and a clamping member 343 located between the first pressing member 341 and the second pressing member 342 and connected to the third nesting structure 2523; the first pressing member 341 and the second pressing member 342 are both sleeved on the second shaft 31; in a specific operation process, when the user rotates the shift position adjusting case 12, the transmission assembly 32 is pushed toward the hollow chamber 100, and the transmission assembly 32 presses the compression spring 24, so that the first pressing member 341 is pressed and displaced toward the second pressing member 342, and the first pressing member 341 and/or the second pressing member 342 and the clamping member 343 are tightly abutted against each other, thereby increasing the friction force.

As another embodiment of the present invention, the first pressing member 341 includes a first stopper 3411 abutting against the pressure spring 33, and a first gasket 3412 abutting against the side of the first stopper 3411 away from the pressure spring 33; the second pressing member 342 includes a second stopper 3421, and a second gasket 3422 abutting against the second stopper 3421 on the side away from the pressing spring 33; and the first pad 3412 and the second pad 3422 may respectively rub against the two outer sides of the clamping member 343 to generate a certain friction force to resist the rotation of the clamping member 343. As another embodiment of the present invention, the inner side of the gear adjusting shell 12 is provided with a first adjusting portion connected to the second shaft 31, and a second adjusting portion located at the periphery of the first adjusting portion and driving the transmission assembly 32 to perform axial movement; and the periphery of this second axle 31 is provided with a plurality of gear draw-in grooves that supply transmission assembly 32 motion to the user can rotate gear adjusting shell 12 according to actual need, and the motion of axial driving second regulation portion, in order to match suitable gear draw-in groove.

As another embodiment of the present invention, the present invention discloses a chest expander, including any of the above embodiments, the force adjusting mechanism is provided with at least a pair of, the chest expander further includes a supporting structure, the supporting structure is used for supporting and/or accommodating the force adjusting mechanism, and two force adjusting mechanisms are respectively installed on two sides of the supporting structure, it should be noted that, in some embodiments, the force adjusting mechanism is detachably connected with the supporting structure, so that the user can replace the force adjusting mechanism, and the user can conveniently carry or transport the chest expander.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. A force adjustment mechanism, comprising:

the gear adjusting mechanism comprises a shell, a gear adjusting mechanism and a gear adjusting mechanism, wherein the shell is provided with a hollow chamber and comprises a fixed shell and a gear adjusting shell which is connected with the fixed shell to form the hollow chamber and can rotate relative to the fixed shell;

2. The force adjustment mechanism of claim 1, wherein: the contraction barrel comprises a first connecting structure for the first shaft to penetrate through, a second connecting structure located on the periphery of the first connecting structure and used for the pull rope to wind, and a third connecting structure located on the side, far away from the one-way component, of the first connecting structure and the second connecting structure, and the coil spring is wound in the third connecting structure;

3. The force adjustment mechanism of claim 2, wherein: the one-way assembly comprises a one-way bearing sleeved on the periphery of the first connecting structure and a one-way shaft sleeve connected with the one-way bearing; the inner periphery of the first connecting structure is provided with a rotating bearing which is sleeved on the first shaft and has the same axle center with the one-way bearing.

4. The force adjustment mechanism of claim 3, wherein: the unidirectional shaft sleeve comprises a first sleeving structure for the first shaft to penetrate through, a second sleeving structure located on the periphery of the first sleeving structure and connected with the pressing assembly, and a third sleeving structure located on the side, far away from the pressing assembly, of the first sleeving structure and the second sleeving structure, wherein the third sleeving structure is located in the connecting groove and connected with the unidirectional bearing.

5. The force adjustment mechanism of claim 4, wherein: the side of the coil spring, which is far away from the unidirectional shaft sleeve, is provided with a fixing component for limiting the displacement of the coil spring;

6. The force adjustment mechanism of claim 5, wherein: the fixed shell comprises a first fixed sleeve connected with the coil spring fixing head, a pull rope sleeve connected with the first fixed sleeve and arranged corresponding to the pull rope, and a second fixed sleeve connected with the pull rope sleeve and rotationally connected with the gear adjusting shell.

7. The force adjustment mechanism of any one of claims 1-6, wherein: the pressing assembly comprises a first pressing component connected with the pressure spring, a second pressing component arranged separately from the first pressing component, and a clamping piece located between the first pressing component and the second pressing component and connected with the third sleeving structure; the first pressing component and the second pressing component are sleeved and connected on the second shaft;

8. The force adjustment mechanism of claim 7, wherein: the first pressing member comprises a first blocking piece and a first gasket, wherein the first blocking piece is abutted against the pressure spring, and the first gasket is abutted against the side, far away from the pressure spring, of the first blocking piece; the second pressing member comprises a second blocking piece and a second gasket which is abutted against the side, far away from the pressure spring, of the second blocking piece; and the first gasket and the second gasket can respectively lean against and rub against the two outer sides of the clamping piece.

9. The force adjustment mechanism of claim 8, wherein: the inner side of the gear adjusting shell is provided with a first adjusting part connected with the second shaft and a second adjusting part which is positioned on the periphery of the first adjusting part and can drive the transmission assembly to axially move; and a plurality of gear clamping grooves for the transmission assembly to move are formed in the periphery of the second shaft.

10. A chest expander, comprising:

power regulating mechanism in accordance with one of claims 1-9, provided with at least one pair;