阅读说明：本技术 阻力机构及拉力器 (Resistance mechanism and chest expander ) 是由 余源泉 于 2021-09-09 设计创作，主要内容包括：本发明提供了一种阻力机构及拉力器,涉及健身设备技术领域,解决了拉力器的阻力大小无法调节的技术问题。该阻力机构包括离合部件、减速装置和磁滞制动器,磁滞制动器的输出轴与减速装置的输入轴传动连接,改变输入磁滞制动器的电流能调节减速装置的输出扭矩；离合部件位于减速装置和绕线轮之间,拉力绳被拉出并带动绕线轮正转时,离合部件将减速装置和绕线轮传动连接,拉力绳回收并带动绕线轮反转时,离合部件使减速装置和绕线轮相脱离。通过改变输入至磁滞制动器的电流大小,能调节磁滞制动器的输出扭矩,即阻力机构能够形成不同大小的防止绕线轮转动的阻力；该阻力可以实现无级调节,使用更加方便。(The invention provides a resistance mechanism and a chest expander, relates to the technical field of fitness equipment, and solves the technical problem that the resistance of the chest expander cannot be adjusted. The resistance mechanism comprises a clutch part, a speed reducer and a hysteresis brake, wherein an output shaft of the hysteresis brake is in transmission connection with an input shaft of the speed reducer, and the output torque of the speed reducer can be adjusted by changing the current input into the hysteresis brake; the clutch component is positioned between the speed reducer and the reel, when the tension rope is pulled out and drives the reel to rotate forwards, the clutch component is used for driving and connecting the speed reducer and the reel, and when the tension rope is recovered and drives the reel to rotate backwards, the clutch component enables the speed reducer and the reel to be separated from each other. The output torque of the hysteresis brake can be adjusted by changing the current input to the hysteresis brake, namely, the resistance mechanism can form different resistance for preventing the reel from rotating; the resistance can realize stepless regulation and is more convenient to use.)

1. A resistance mechanism, set up in the chest expander, characterized in that, includes clutch part, decelerator (2) and hysteresis brake (1), wherein:

the output shaft of the hysteresis brake (1) is in transmission connection with the input shaft of the speed reducer (2), and the output torque of the speed reducer (2) can be adjusted by changing the current input into the hysteresis brake (1);

the clutch component is located between the speed reduction device (2) and the reel (4), when the tension rope (5) is pulled out and drives the reel (4) to rotate forwards, the clutch component is used for connecting the speed reduction device (2) with the reel (4) in a transmission mode, when the tension rope (5) is recovered and drives the reel (4) to rotate backwards, the clutch component enables the speed reduction device (2) and the reel (4) to be separated from each other.

2. The resistance mechanism according to claim 1, wherein the clutch member includes a one-way needle bearing (3), an outer race of the one-way needle bearing (3) is connected to an output shaft of the reduction gear (2), and an inner race of the one-way needle bearing (3) is fixedly connected to the reel (4);

when the tension rope (5) is pulled out and drives the reel (4) to rotate forwards, the inner ring and the outer ring of the one-way needle bearing (3) are static or move synchronously; when the tension rope (5) is recovered and drives the reel (4) to rotate reversely, the inner ring of the one-way needle bearing (3) rotates relative to the outer ring of the one-way needle bearing.

3. The resistance mechanism according to claim 2, characterized in that a hollow shaft (401) is arranged on one side of the reel (4), a shaft sleeve (6) is sleeved on the hollow shaft (401), the shaft sleeve (6) is in interference fit with the outer wall of the hollow shaft (401), and the outer wall of the shaft sleeve (6) is fixedly connected with the inner ring of the one-way needle bearing (3);

a shaft body (11) penetrates through the hollow shaft (401), and the shaft body (11) is rotatably connected with the hollow shaft (401).

4. The resistance mechanism according to claim 1, characterized in that the reduction gear (2) comprises a housing portion (203), the housing portion (203) being fixedly connected to the output shaft of the reduction gear (2);

the inner wall of the shell part (203) is provided with a gear ring (204), an input shaft of the speed reducing device (2) is provided with an input gear (206), the periphery of the input gear (206) is meshed with one or more transmission gears (202), and the transmission gears (202) are in meshed transmission with the gear ring (204) and used for increasing the output torque of the speed reducing device (2).

5. A resistance mechanism according to any of claims 1 to 3, further comprising a power supply assembly and a control unit, wherein:

the power supply assembly is electrically connected with the control unit, and the control unit is electrically connected with the hysteresis brake (1) and used for adjusting the current input to the hysteresis brake (1).

6. The resistance mechanism according to claim 5, wherein the power supply assembly comprises a battery cover (16), a battery (15), the battery cover (16) securing the battery (15) within the chest developer, the battery (15) being electrically connected to the control unit;

the resistance mechanism further comprises a display unit which is electrically connected with the control unit and used for displaying the pulling force of a user on the reel (4).

7. A chest expander, comprising a housing (100), and a drag mechanism according to any one of claims 1 to 6 and a reel (4) located in said housing (100), said reel (4) being rotatably connected to said housing (100), said reel (4) being wound with a tension cord (5).

8. The chest developer according to claim 7, further comprising an end cap (10) and a shaft body (11), wherein the shaft body (11) is rotatably connected with the reel (4), and a shaft shoulder (12) is arranged at the end part of the shaft body (11); the end cover (10) is connected with the reel (4) and is surrounded by an accommodating cavity, and the shaft shoulder (12) is positioned at the end part of the shaft body (11) and abuts against the end cover (10);

the containing cavity is internally provided with an elastic component which is connected with the reel (4) and used for driving the reel (4) to rotate and reset.

9. A spring device according to claim 8, wherein said elastic means comprise a coil spring (9), said coil spring (9) being located in said housing, said coil spring (9) being fixedly connected at its outer end to said reel (4) and at its inner end to said shoulder (12), said coil spring (9) being capable of rotationally resetting said reel (4) under tension.

10. The chest expander according to claim 7, wherein a perforation (103) is provided on the housing (100), the free end of the tensile cord (5) extends out of the housing (100) through the perforation (103), and a cord lock assembly (14) is fixed on the free end of the tensile cord (5).

Technical Field

The invention relates to the technical field of fitness equipment, in particular to a resistance mechanism and a chest expander.

Background

The chest developer is one kind of exerciser suitable for public health exercise. People often use the body-building rope chest expander to build and build body at present.

The body-building rope pulling device in the prior art usually comprises a shell and a pulling rope wound in the shell, and when a user uses the chest expander, the user overcomes the resistance of the pulling rope to pull the chest expander, so that the exercise effect is achieved.

The applicant has found that the prior art has at least the following technical problems:

in the prior chest expander, the tension rope is made of elastic materials, the longer the rope is pulled, the larger the tension is, the tension strength cannot be constant, and the size of the tension is difficult to detect. The magnitude of the pulling force and the calories consumed during each exercise cannot be accurately displayed and scientific exercise guidance cannot be provided.

In another chest expander, the tension rope is made of non-elastic material, and the user needs to overcome the resistance of the tension rope in the shell to pull the tension rope; the pulling force is small, and the exercise effect cannot be achieved.

Disclosure of Invention

The invention aims to provide a resistance mechanism and a chest expander, which aim to solve the technical problem that the resistance of the chest expander cannot be adjusted when a user uses the chest expander in the prior art; the technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a resistance mechanism which is arranged in a chest expander and is characterized by comprising a clutch part, a speed reducer and a hysteresis brake, wherein:

the output shaft of the hysteresis brake is in transmission connection with the input shaft of the speed reducer, and the output torque of the speed reducer can be adjusted by changing the current input into the hysteresis brake;

the clutch component is positioned between the speed reducer and the reel, when the tension rope is pulled out and drives the reel to rotate forwards, the clutch component is used for driving and connecting the speed reducer and the reel, and when the tension rope is recovered and drives the reel to rotate backwards, the clutch component is used for separating the speed reducer from the reel.

Preferably, the clutch component comprises a one-way needle bearing, an outer ring of the one-way needle bearing is connected with an output shaft of the speed reducer, and an inner ring of the one-way needle bearing is fixedly connected with the reel;

when the tension rope is pulled out and drives the reel to rotate positively, the inner ring and the outer ring of the one-way needle bearing both move statically or synchronously; when the tension rope is recovered and drives the reel to rotate reversely, the inner ring of the one-way needle bearing rotates relative to the outer ring of the one-way needle bearing.

Preferably, a hollow shaft is arranged on one side of the reel, a shaft sleeve is sleeved on the hollow shaft, the shaft sleeve is in interference fit with the outer wall of the hollow shaft, and the outer wall of the shaft sleeve is fixedly connected with the inner ring of the one-way needle bearing;

a shaft body penetrates through the hollow shaft, and the shaft body is rotatably connected with the hollow shaft.

Preferably, the speed reducer comprises a shell part, and the shell part is fixedly connected with an output shaft of the speed reducer;

the inner wall of the shell part is provided with a gear ring, an input shaft of the speed reducer is provided with an input gear, the periphery of the input gear is meshed with one or more transmission gears, and the transmission gears are in meshed transmission with the gear ring and used for increasing the output torque of the speed reducer.

Preferably, the resistance mechanism further comprises a power supply assembly and a control unit, wherein:

the power supply assembly is electrically connected with the control unit, and the control unit is electrically connected with the hysteresis brake and used for adjusting the current input to the hysteresis brake.

Preferably, the power supply assembly comprises a battery and a battery cover, the battery cover fixes the battery in the chest expander, and the battery is electrically connected with the control unit;

the resistance mechanism further comprises a display unit, and the display unit is electrically connected with the control unit and used for displaying the pulling force of a user acting on the reel.

This embodiment provides a chest expander, including the casing and be located above-mentioned resistance mechanism and reel in the casing, rotate on the reel connect in the casing, the winding has the stay cord on the reel.

Preferably, the chest expander further comprises an end cover and a shaft body, the shaft body is rotatably connected with the reel, and a shaft shoulder is arranged at the end part of the shaft body; the end cover is connected with the reel, an accommodating cavity is formed in the end cover and the reel in a surrounding mode, and the shaft shoulder is located at the end portion of the shaft body and abuts against the end cover;

the containing cavity is internally provided with an elastic component, and the elastic component is connected with the reel and used for driving the reel to rotate and reset.

Preferably, the elastic component comprises a coil spring, the coil spring is located in the accommodating cavity, the outer end of the coil spring is fixedly connected with the reel, the inner end of the coil spring is fixedly connected with the shaft shoulder, and the coil spring can drive the reel to rotate and reset in a stretching state.

Preferably, a through hole is formed in the shell, the free end of the tensile cord penetrates through the through hole and extends out of the shell, and a cord fastener assembly is fixed to the free end of the tensile cord.

Compared with the prior art, the resistance mechanism and the chest expander provided by the invention have the following beneficial effects:

the output torque of the hysteresis brake can be adjusted by changing the current input to the hysteresis brake, and the output torque of the speed reducer is adjusted; when the tension rope is pulled out and drives the reel to rotate forwards, the clutch component is used for driving and connecting the speed reducer and the reel, so that the output torque of the speed reducer needs to be resisted when the tension rope is pulled, namely, the resistance mechanism can form resistance with different sizes for preventing the reel from rotating; the resistance can realize stepless regulation and is more convenient to use.

The chest expander with the resistance mechanism can adjust the resistance according to the specific requirements of a user, is convenient to use and has wide application range.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the initial state of the chest expander;

FIG. 2 is a schematic view of the chest expander with the tension cord pulled out;

fig. 3 is a schematic sectional view of the chest expander;

figure 4 is an exploded view of the chest developer;

FIG. 5 is a schematic view of the reduction gear unit;

FIG. 6 is a schematic cross-sectional view A-A of FIG. 5;

fig. 7 is a schematic view of a fixing structure of the coil spring.

In the figure 100, a housing; 101. an upper shell; 102. a bottom case; 103. perforating; 1. a hysteresis brake; 2. a reduction gear; 201. a reduction gear output shaft; 202. a transmission gear; 203. a housing portion; 204. a ring gear; 205. a reduction gear input shaft; 206. an input gear; 3. a one-way needle bearing; 4. a reel; 401. a hollow shaft; 5. a tension rope; 6. a shaft sleeve; 7. a bearing; 8. a gasket; 9. a coil spring; 10. an end cap; 11. a shaft body; 12. a shaft shoulder; 13. a PCB board; 14. a cord lock assembly; 15. a battery; 16. a battery cover; 17. a fixed mount; 18. a display screen; 19. an operation panel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the equipment or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The embodiment of the invention provides a resistance mechanism and a chest expander, which can adjust the resistance according to the specific requirements of a user, are convenient to use and have wide application range.

The technical solution provided by the present invention is explained in more detail below with reference to fig. 1 to 7.

Example one

As shown in fig. 1 to 7, the present embodiment provides a resistance mechanism, provided in a spring exerciser, including a clutch part, a reduction gear 2, and a hysteresis brake 1, wherein: the output shaft of the hysteresis brake 1 is in transmission connection with the input shaft of the speed reducer 2, and the output torque of the speed reducer 2 can be adjusted by changing the current input into the hysteresis brake 1; the clutch component is positioned between the speed reducer 2 and the reel 4, when the tension rope 5 is pulled out and drives the reel 4 to rotate forwards, the clutch component connects the speed reducer 2 and the reel 4 in a transmission way, and when the tension rope 5 is recovered and drives the reel 4 to rotate backwards, the clutch component enables the speed reducer 2 and the reel 4 to be separated from each other. The tension cord 5 is wound around the reel 4.

The term "forward direction" and "reverse direction" as used herein mean relative terms, and if clockwise is defined as forward direction, counterclockwise is defined as reverse direction; conversely, if the counterclockwise direction is defined as the forward direction, the clockwise direction is defined as the reverse direction. The hysteresis brake 1 rotates in the same direction as the output shaft of the reduction gear 2, and the rotation direction of the hysteresis brake and the rotation direction of the output shaft of the reduction gear are opposite to the rotation direction of the reel 4 when pulling the rope.

In the present embodiment, the reel 4 is rotated clockwise when pulling the rope, and the hysteresis brake 1 is rotated counterclockwise, but in the present embodiment, the clockwise direction is defined as a forward direction and the counterclockwise direction is defined as a reverse direction.

The hysteresis brake 1 is a conventional mature technology, which generates a certain torque by controlling an input exciting current based on a hysteresis principle, and is a torque control component based on the hysteresis principle. Can be directly purchased from the market, and the structure thereof is not described in detail herein.

Considering that the torque of the hysteresis brake 1 is not yet sufficiently large, the output shaft of the hysteresis brake 1 is connected to the reduction gear input shaft 205, and by inputting the torque of the hysteresis brake 1 to the reduction gear 2, reducing the speed by the reduction gear 2, and increasing the torque of the reduction gear output shaft 201, the user can exercise when pulling the tension rope 5 to rotate the reel 4.

Wherein, the reduction ratio of the reduction gear 2 is n, the torque of the hysteresis brake 1 is increased by n times after passing through the reduction gear 2. The co-operating structure of the reduction gear 2 and the hysteresis brake 1 together provide the resistance that the user needs to overcome when pulling the tensile cord 5.

When the user pulls the tension rope 5, the tension rope 5 is pulled out and drives the reel 4 to rotate forward (see the arrow direction in fig. 3, the tension rope 5 is pulled out and drives the reel 4 to rotate clockwise when looking along the arrow direction), the clutch component is in transmission connection with the speed reducer 2 and the reel 4, and at the moment, the user wants to pull the tension rope 5 and needs to overcome the torque output by the speed reducer 2, so that the exercise effect is achieved. When the user loosens the tension rope 5, the tension rope 5 is recovered and drives the reel 4 to rotate reversely (in the embodiment, in the counterclockwise direction), and the clutch component enables the speed reducer 2 and the reel 4 to be separated from each other, so that the torque output by the speed reducer 2 is not required to be overcome during recovery of the tension rope 5, and the tension rope 5 can be recovered smoothly.

The resistance mechanism of the present embodiment can adjust the output torque of the hysteresis brake 1 and adjust the output torque of the reduction gear 2 by changing the magnitude of the current input to the hysteresis brake 1; since the clutch member drivingly connects the reduction gear 2 and the reel 4 when the tension cord 5 is pulled out and the reel 4 is rotated in the normal direction, it is necessary to oppose the output torque of the reduction gear 2 when the tension cord 5 is pulled, i.e., the resistance mechanism can provide different amounts of resistance against the rotation of the reel 4. And the resistance can realize stepless regulation, and the use is more convenient.

It will be appreciated that the moment is the product of the force and the moment arm, when the user pulls the pull-cord 5 just to overcome the output torque against the reduction gear 2, the pull force at this point being related to the radius of the reel 4, the amount of pull force being able to be calculated knowing the output torque of the reduction gear 2 and the radius of the reel 4.

As an alternative embodiment, the clutch component of the present embodiment includes a one-way needle bearing 3, an outer ring of the one-way needle bearing 3 is connected with the reduction gear output shaft 201, and an inner ring of the one-way needle bearing 3 is fixedly connected with the reel 4; when the tension rope 5 is pulled out and drives the reel 4 to rotate positively, the inner ring and the outer ring of the one-way needle bearing 3 both stand still or move synchronously; when the tension rope 5 is recovered and drives the reel 4 to rotate reversely, the inner ring of the one-way needle bearing 3 rotates relative to the outer ring thereof.

The above-mentioned unidirectional needle bearing 3 is a mature technology in the field, and the structure thereof will not be described herein.

Where it is to be understood that the inner race of the needle bearing 3 can only rotate in one direction relative to the outer race, when connecting the needle bearing 3 to the reel 4 and the reduction gear 2, it is necessary to satisfy: when the tension rope 5 is pulled out and drives the reel 4 to rotate positively, the inner ring of the unidirectional needle bearing 3 cannot rotate relative to the outer ring, and the inner ring and the outer ring of the unidirectional needle bearing 3 are equivalent to a whole; in this way, the transmission connection between the upper reel 4 and the speed reducer 2 can be realized, and when the pulling force applied by the user can overcome the resistance output by the speed reducer 2, the reel 4 drives the one-way needle bearing 3 to rotate, and because the outer ring of the one-way needle bearing 3 is fixedly connected with the output shaft of the speed reducer 2, the speed reducer 2 and the hysteresis brake 1 can be driven to rotate reversely, namely clockwise.

And the one-way needle bearing 3 needs to satisfy simultaneously: when the tension rope 5 is recovered and drives the reel 4 to rotate reversely, the inner ring of the one-way needle bearing 3 rotates relative to the outer ring thereof, namely the inner ring rotates, the outer ring is static, the one-way needle bearing 3 cuts off the transmission connection between the reel 4 and the speed reducing device 2, at this time, the reverse rotation of the reel 4 is not influenced by the speed reducing device 2 any more, and therefore, the tension rope 5 can be recovered smoothly.

The use of the structure of the hysteresis brake 1 in cooperation with the reduction gear 2 also has the obvious effects of: through the size of control current, need overcome 50N pulling force when the user pulls the drag rope 5, after the user's application of force reached 50N, reel 4 drove one-way bearing 3 synchronous clockwise motion this moment, overcome the anticlockwise moment of torsion of decelerator 2 output simultaneously, made decelerator 2 and hysteresis brake 1 motion switching-over, decelerator 2 clockwise rotation, and the cooperation structure of hysteresis brake 1 and decelerator 2 can not destroyed. Meanwhile, when the magnitude of the current flowing into the hysteresis brake 1 is constant, the resistance provided by the engagement structure of the hysteresis brake 1 and the reduction gear 2 is constant.

As an alternative embodiment, referring to fig. 3, one side of the reel 4 is provided with a hollow shaft 401, the hollow shaft 401 is sleeved with a shaft sleeve 6, the shaft sleeve 6 is in interference fit with the outer wall of the hollow shaft 401, and the outer wall of the shaft sleeve 6 is fixedly connected with the inner ring of the one-way needle bearing 3; a shaft body 11 penetrates through the hollow shaft 401, and the shaft body 11 is rotatably connected with the hollow shaft 401.

Above-mentioned axis body 11 sets up in casing 100, hollow shaft 401 passes through bearing 7 to be connected on axis body 11, when the user stimulates the pulling force rope 5, reel 4 can rotate on axis body 11 under the drive of pulling force rope 5, simultaneously because hollow shaft 401 is fixed with axle sleeve 6, reel 4 drives axle sleeve 6 simultaneously and rotates, axle sleeve 6 and one-way bearing 3's inner circle fixed connection, the moment of torsion of decelerator 2 output is applyed on one-way bearing 3, when user's pulling force is enough big, can overcome decelerator 2's output torque, drive reel 4, one-way bearing 3 synchronous revolution, and realize decelerator 2 reversal.

The speed reducer 2 is used for increasing the torque output by the hysteresis brake 1, increasing the resistance to the wire winding wheel 4 and enabling a user to achieve the exercise effect. The reduction means 2 may thus be a gear assembly, the output torque being increased by the gears meshing with each other.

In the present embodiment, a specific implementation of the speed reduction device 2 is provided, and referring to fig. 3 to 6, the speed reduction device 2 includes a casing portion 203, and the casing portion 203 is fixedly connected to an output shaft of the speed reduction device 2; the inner wall of the housing part 203 is provided with a gear ring 204, the input shaft of the speed reduction device 2 is provided with an input gear 206, the periphery of the input gear 206 is meshed with one or more transmission gears 202, and the transmission gears 202 are meshed with the gear ring 204 for transmission, so that the output torque of the speed reduction device 2 is increased.

The gear ring 204 is directly machined and formed on the inner wall of the shell portion 203, the gear ring 204, the input gear 206 and the transmission gear 202 are located in the same plane, referring to fig. 6, the transmission gears 202 in the embodiment include three transmission gears 202 located on the periphery of the input gear 206, all the transmission gears 202 are in meshing transmission with the gear ring 204, the number of teeth of the input gear 206, the transmission gears 202 and the gear ring 204 is sequentially increased, and after power is transmitted to the gear ring 204 through the input gear 206 and the transmission gears 202, the speed is reduced, and the torque is increased; thereby increasing the resistance to the wire winding wheel 4 and enabling the user to achieve the effect of exercise

As an alternative embodiment, referring to fig. 4, the resistance mechanism of this embodiment further includes a power supply assembly and a control unit, wherein: the power supply assembly is electrically connected with the control unit, and the control unit is electrically connected with the hysteresis brake 1 and is used for adjusting the current input to the hysteresis brake 1.

The power supply assembly supplies power to the control unit and can be externally connected with a power supply or a battery 15 and the like. The control unit can be a single chip microcomputer and the like, as shown in fig. 4, a PCB 13 is arranged in the housing 100, the single chip microcomputer is connected to the PCB 13, the hysteresis brake 1 is connected to the output end of the single chip microcomputer, and the magnitude of the current flowing into the hysteresis brake 1 can be adjusted by adjusting the voltage of the output end through presetting a program, so that the torque of the hysteresis brake 1 can be adjusted.

As an alternative embodiment, the power supply assembly shown in fig. 4 comprises a battery 15, a battery cover 16, the battery cover 16 fixes the battery 15 in the chest expander housing 100, the battery 15 is electrically connected with the control unit;

the resistance mechanism also comprises an input module which is electrically connected with the input end of the control unit and used for inputting control signals; referring to fig. 4, the casing 100 is provided with an operation panel 19 for identifying input information.

The resistance mechanism also comprises a display unit which is electrically connected with the control unit and is used for displaying the pulling force of a user acting on the reel 4; referring to fig. 4, the display unit includes a display screen 18, and the display screen 18 is disposed on the housing 100.

Wherein, the principle of the tension display is as follows: knowing the magnitude of the current in the hysteresis brake 1 gives the magnitude of the torque of the hysteresis brake 1 and knowing the reduction ratio of the reduction gear 2 gives the torque of the output of the reduction gear 2, which the user needs to overcome when pulling the tension rope 5 to rotate the reel 4. The moment is the vector product of the force and the moment arm, when the user pulls the tension rope 5 just to overcome the output torque of the anti-deceleration device 2, the tension at this moment is related to the radius of the reel 4, and the tension can be calculated under the condition that the radius of the reel 4 is known. The relationship between the current and the tension is realized through the principle, and the relationship can be displayed on the display screen 18 after being calculated through a program.

Example two

The embodiment provides a chest-expander, as shown in fig. 1-3 and 4, which comprises a housing 100, the resistance mechanism and a reel 4, wherein the resistance mechanism and the reel 4 are positioned in the housing 100, the reel 4 is rotatably connected in the housing 100, and a tension rope 5 is wound on the reel 4. The shell is detachably connected with the bottom shell 102 through the upper shell 101, so that the shell is convenient to mount and dismount; the hysteresis brake 1 is mounted in the housing 100 by means of a fixing frame 17.

The chest expander with the resistance mechanism can adjust the resistance according to the specific requirements of a user, is convenient to use and has wide application range.

After loosening the tension rope 5, the user can retrieve automatically for the convenience of tension rope 5, still include elastomeric element in the chest expander, and elastomeric element is used for pulling reel 4 and resets after taking place elastic deformation, and then realizes the smooth of tension rope 5 and retrieves.

Referring to fig. 3, 4 and 7, the present embodiment provides a fixing structure of an elastic member: the chest developer also comprises an end cover 10 and a shaft body 11, wherein the shaft body 11 is rotatably connected with the reel, and a shaft shoulder 12 is arranged at the end part of the shaft body 11; the end cover 10 is connected with the reel 4, an accommodating cavity is formed by the end cover and the reel 4, and the shaft shoulder 12 is located at the end part of the shaft body 11 and abuts against the end cover 10; the elastic component is arranged in the accommodating cavity and is connected with the reel 4 for driving the reel 4 to rotate and reset. Wherein, the containing cavity formed by the end cover 10 and the reel 4 can contain the elastic component, and the elastic component is prevented from being separated to influence the reset of the reel 4.

As an alternative embodiment, see fig. 3, 4 and 7, the elastic component comprises a coil spring 9, the coil spring 9 is located in the accommodating cavity, the outer end of the coil spring 9 is fixedly connected with the reel 4, the inner end of the coil spring 9 is fixedly connected with the shaft shoulder 12, and the coil spring 9 can drive the reel 4 to rotate and reset in a stretching state.

When mounting, the shaft sleeve 6 is tightly fitted to the hollow shaft 401 inside the right end of the reel 4 (the two are forced not to rotate relatively). The washer 8 (shown in fig. 4), the coil spring 9, the spring plate, the end cap 10, the shaft body 11, and the shoulder 12 are sequentially fitted into the left end of the reel 4 (shown in fig. 4), wherein the shoulder 12, the coil spring 9, and the reel 4 are assembled with reference to fig. 7. Then, the two bearings 7 are inserted into the shaft body 11 from the left end, and the bearings 7 are fixed in the hollow shaft 401 at the left end of the reel 4.

When the tension rope 5 is pulled, referring to fig. 2, the tension rope 5 drives the reel 4 to rotate clockwise, and the outer end of the coil spring 9 is connected with the reel 4, so that the coil spring 9 can be pulled to stretch and generate elastic deformation; at this time, the one-way needle bearing 3 drivingly connects the reel 4 and the reduction gear 2, and when the pulling force of the user is large enough, the output torque of the reduction gear 2 can be overcome to drive the reel 4 and the one-way needle bearing 3 to synchronously rotate, and the reduction gear 2 is reversely rotated.

When the tension rope 5 is loosened, the unidirectional needle bearing 3 cuts off the power connection between the reel 4 and the reduction gear 2, and at the same time, the coil spring 9 pulls the reel 4 to rotate counterclockwise by the elastic restoring force, so that the reel 4 is smoothly restored, as shown in fig. 1.

As an alternative embodiment, referring to fig. 2, a through hole 103 is provided on the casing 100, a free end of the tensile cord 5 extends out of the casing 100 through the through hole 103, and a cord lock assembly 14 is fixed on the free end of the tensile cord 5. The rope fastener assembly 14 facilitates a user to pull the free end of the tension rope 5, and the rope fastener assembly 14 can be located outside the through hole 103, so that the user can pull the tension rope 5 conveniently at any time.

When the switch is turned on, the control unit controls the rechargeable battery 15 to supply current to the hysteresis brake 1, and the hysteresis brake 1 generates a torque with a predetermined magnitude, which is increased by the reduction gear 2, thereby increasing the torque at the output end of the gear box. In use, the switch is turned on and the amount of resistance is displayed on the display screen 18 by selecting the amount of force on the operating panel 19, as shown in figure 2, and pulling on the cord lock assembly 14 will achieve the desired resistance. Because the resistance of the chest expander is constant, the calorie consumption of a single time or the total calorie consumption can be calculated and displayed according to the resistance, so that the basis is improved for scientific and healthy exercise, and the exercise of people is guided. One can select the appropriate amount of resistance exercise, as well as exercise durations of different amounts of resistance.

The particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.