CN113457064B

CN113457064B - Chest expander

Info

Publication number: CN113457064B
Application number: CN202110740619.6A
Authority: CN
Inventors: 王东明; 王宁扬; 王帅
Original assignee: Beijing Kingsmith Technology Co Ltd
Current assignee: Beijing Kingsmith Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2023-05-26
Anticipated expiration: 2041-06-30
Also published as: CN113457064A

Abstract

The utility model discloses a chest expander, which comprises a platform main body, wherein the platform main body is rotationally connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with an outlet which is used for the pull rope to extend out; thus, the platform main body is used for a user to stand, so that the platform main body is fixed, and the wire wheel is pulled out to drive the wire wheel to rotate. The chest expander of the utility model does not need to rely on the large volume of the instrument, and relies on the weight of a user to ensure the stability.

Description

Chest expander

Technical Field

The utility model relates to fitness equipment, in particular to a chest expander.

Background

With the continuous improvement of living standard, people pay more attention to physical exercise, so that more and more fitness equipment is in our life. Especially, home fitness equipment is increasingly popular, and people can be trained to a certain extent in environments with small space such as home or office due to miniaturization of products and simplicity of operation.

The chest expander is an instrument suitable for mass body building and exercise. The user sets different use modes according to the self-training requirement, and mainly trains different muscles of the body. Specifically, chest training, arm training and the like can be performed by using the chest expander, and a good body form is molded, so that the effect of gymnasium body building is achieved.

But the existing chest expander solves the problems that the gravity source depends on the weight stack, the stability of the appliance depends on the large volume of the appliance, and the chest expander does not accord with the requirements of safety of household appliances, small occupied space and flexibility and portability.

Disclosure of Invention

The utility model provides a chest expander, which does not need a large-scale instrument body to ensure stability. The specific technical scheme is as follows:

a chest expander comprises a platform main body, wherein the platform main body is rotationally connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with an outlet which is used for the pull rope to extend out; thus, the platform main body is used for a user to stand, so that the platform main body is fixed, and the wire wheel is pulled out to drive the wire wheel to rotate.

Further, the reel is horizontally disposed in the platform body.

Further, the reel is provided with a rotating member, a resistance device is arranged in the platform main body, and the resistance device adsorbs the rotating member so as to apply resistance to the rotating member and prevent the rotating member from rotating.

Further, the resistance device comprises a first magnetic component and a second magnetic component, the first magnetic component and the second magnetic component are respectively arranged at two axial ends of the rotating piece, and the resistance generated by the first magnetic component and the second magnetic component to the rotating piece is the same.

Further, the resistance device comprises an adsorption block, a hollow cavity is formed in the adsorption block, a magnetic assembly is detachably arranged in the hollow cavity, and the rotation piece and the adsorption block are mutually adsorbed to generate a magnetic field.

Further, one end of the hollow chamber is provided with an opening, and the magnetic component is inserted from the opening and is installed in the hollow chamber.

Further, the magnetic assembly comprises a mounting plate, and a magnet is detachably connected to the mounting plate.

Further, the resistance device comprises a movable magnetic adsorption block, and the magnetic adsorption block moves, so that the distance between the magnetic adsorption block and the rotating piece is changed, and the resistance is adjusted.

Further, the resistance device comprises a sleeve, a screw is connected with the sleeve in a threaded mode, the screw is connected with the platform main body in a rotating mode, and one end of the sleeve is fixed with the magnetic adsorption block.

Further, a reset device is arranged in the platform main body, and the reset device applies a restoring force to the wire wheel.

Further, the resetting device comprises an elastic piece, one end of the elastic piece is fixed with the platform main body, and the other end of the elastic piece is fixed with the wire wheel.

Further, a unidirectional piece is linked between the rotating piece and the wire wheel; when the pull rope is used, the unidirectional piece enables the wire wheel and the rotating piece to be fixed, and the pull force of the pull rope overcomes the restoring force and the resistance to drive the wire wheel to rotate positively; when the rope is wound, the unidirectional piece enables the rotating piece to be connected with the wire wheel in a rotating way, and the restoring force enables the wire wheel to reversely rotate and reset.

Further, one side of the wire outlet is connected with a sliding part in a sliding way, and the sliding part is provided with a wire channel which is used for the pull rope to penetrate; thus, when the pull rope is pulled, the sliding piece slides along the wire outlet along with the pull rope, and after the pull rope is guided by the wire guide channel, the pull rope stretches out of the platform main body from the wire outlet.

Further, the sliding piece is rotatably connected with a movable pulley, and the pull rope bypasses the movable pulley.

Further, one end of the wire outlet is provided with a positioning piece, the positioning piece is provided with a limiting opening, and the pull rope penetrates through the wire outlet after extending out of the limiting opening.

Further, the locating piece is rotationally connected with the fixed pulley, and the stay cord walks around the fixed pulley and enters into the limiting port.

The chest expander has the following technical effects:

1. the user stands on the standing main body, and the standing platform is fixed by using the weight of the user, so that the stability of the large volume of the device is eliminated, and the whole chest expander can be miniaturized and flattened.

2. The chest expander is miniaturized by the horizontal arrangement of the wire wheels, so that the magnetic force resistance device and the resetting device of the elastic piece are adopted, and the chest expander can be stored in the lower space of the furniture such as a sofa.

3. Through the resistance balance in the rotor both sides for the rotor atress of two sides simultaneous stress is even, and the user is difficult to take place deflection at the in-process of pull stay cord.

4. The installation and the dismantlement step of simplifying the magnet are convenient for adjust the magnet, can change magnetic assembly according to user's physical quality variation, satisfy different user's user demand.

5. The distance between the magnet and the rotating piece is changed, and then the distance is converted into a resistance value required by a user, so that the resistance value is accurately adjusted according to the requirement of the user

6. Under the action of the unidirectional piece, when the wire wheel rotates positively, the wire wheel and the rotating piece are fixed, and restoring force and resistance can be transmitted to the wire wheel, so that the movement quantity is improved; when the wire wheel rotates reversely, the rotating piece is connected with the wire wheel in a rotating way, so that the resistance cannot be transmitted to the wire wheel, and the reset force is not blocked by the resistance, thereby ensuring smooth rope winding action.

7. By arranging the slidable sliding part, the movable pulley and the fixed pulley, the contact between the pull rope and the side wall of the appearance opening is reduced by the guiding of the sliding part, so that the abrasion of the pull rope is reduced, and the service life of the pull rope is prolonged; the movable pulley is arranged, so that sliding friction is changed into rolling friction, abrasion of friction force is reduced, and the service life of a pull rope is prolonged; the fixed pulley guides and turns the stay cord, and the stay cord is prevented from being wound in the platform main body after being loosened.

Drawings

FIG. 1 is a schematic view of the external structure of the chest expander according to the present utility model;

FIG. 2 is a schematic view of the internal structure of the chest expander according to the present utility model;

FIG. 3 is a cross-sectional view of the chest expander of the present utility model;

FIG. 4 is a schematic diagram of the structure of an adsorption block according to the present utility model;

FIG. 5 is a schematic view of the mounting plate and magnet assembly structure of the present utility model

FIG. 6 is a cross-sectional view taken along the direction C-C in FIG. 5

FIG. 7 is a cross-sectional view of an adjustment mechanism of the present utility model;

FIG. 8 is a schematic view of an adjusting mechanism according to the present utility model;

FIG. 9 is a schematic diagram of a limiting groove structure in the present utility model;

FIG. 10 is a schematic diagram of the installation structure of the resetting device in the present utility model;

FIG. 11 is an exploded view of the spool and rotor of the present utility model;

FIG. 12 is a schematic view of a one-way bearing structure according to the present utility model;

FIG. 13 is a schematic view of a rotor structure according to the present utility model;

FIG. 14 is a schematic view of a wire wheel structure according to the present utility model;

FIG. 15 is a schematic view of a cover structure according to the present utility model;

FIG. 16 is a schematic diagram of a pull cord routing in accordance with the present utility model;

fig. 17 is an enlarged view of a portion a of fig. 16;

FIG. 18 is a schematic view of a slider structure according to the present utility model;

fig. 19 is a schematic view of a positioning member according to the present utility model.

Description of the drawings:

1. a platform body;

11. a bottom case; 111. a first limit groove; 112. a first shaft hole;

12. a cover body; 121. a wire outlet; 122. the second limit groove; 123. a mounting column; 124. a second shaft hole;

2. a wire wheel;

21. a one-way bearing; 211. an outer groove; 212. an inner tank; 22. positioning holes; 221. an internal key; 23. a second rotating shaft; 231. a radial groove;

3. a pull rope; 31. a handle;

4. a rotating member; 41. a connecting shaft; 411. an external key; 42. a first rotating shaft;

5. a resistance device;

51. an adsorption block; 511. a guide block; 512. a mounting hole; 52. a reinforcing plate; 53. a sleeve; 54. an adjusting mechanism; 541. a screw; 542. a connecting column; 543. an adjustment knob; 55. a mounting plate; 551. a mounting groove; 56. a magnet;

6. a reset device; 61. a coil spring; 62. an assembly groove; 621. a notch; 63. a limit cover;

7. a wire guide device;

71. a slider; 711. a carriage; 712. a movable pulley; 7121. a first recess; 713. a first shaft body; 714. a wire passage; 72. a track; 721. a first side frame; 7211. a first chute; 722. a second side frame; 7221. a second chute; 73. a positioning piece; 731. a fixed pulley; 7311. a second notch; 732. a second shaft body; 733. a limit opening; 74. a fixing frame; 741. a sub-frame; 742. and a side plate.

Detailed Description

For a better understanding of the objects, functions and specific embodiments of the present utility model, a chest expander according to the present utility model will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 3, a chest expander includes a platform main body 1. The platform main body 1 is rotatably connected with a wire wheel 2, and a pull rope 3 is wound on the wire wheel 2. The platform main body 1 is provided with an outlet 121, and the pull rope 3 extends out of the turntable main body from the outlet 121. Therefore, when the chest expander is used, a user stands on the platform main body 1 to fix the platform main body 1, pulls the pull rope 3 out of the wire wheel 2 through the handle 31, and drives the wire wheel 2 to rotate positively, so that the effect of training strength is achieved. Thus, the weight of the docking main body 1 is fixed by the weight of the user, not the weight of the docking main body 1 itself. Further, the use environment of the platform body 1 is not limited at all, and the chest expander may be placed in any place having a flat surface.

The platform body 1 is a shell, and includes a bottom shell 11 and a cover 12. The platform body 1 is also provided with a resistance device 5 and a reset device 6. The resetting device 6 applies a restoring force to the wire wheel 2 to enable the wire wheel 2 to reversely rotate; the reel 2 is provided with a rotating member 4, and the rotating member 4 is typically a turntable. The resistance device 5 applies resistance to the rotation member 4 to hinder the rotation of the rotation member 4. Therefore, the user needs to overcome the action of restoring force and resistance when pulling the pull rope 3, so as to achieve the training purpose.

Moreover, in view of miniaturization and flattening of the docking main body 1, the reel 2 and the rotator 4 are horizontally disposed within the docking main body 1.

As shown in fig. 4 to 6, for the purpose of resistance and miniaturization, resistance is generated using magnetic force. Therefore, the resistance device 5 includes the adsorption block 51 having magnetism, and the adsorption block 51 adsorbs the rotor, thereby generating resistance. And the turntable is made of magnetic metal, such as iron, steel and other materials.

Moreover, the adsorption block 51 is provided with a first magnetic component and a second magnetic component, which are respectively disposed at the two axial ends of the rotating member 4, and the resistance generated by the first magnetic component and the second magnetic component to the two ends of the rotating member 4 is the same. Thereby ensuring that the rotating member 4 is stressed evenly in the axial direction and rotates stably. Therefore, a containing groove is formed between the first magnetic component and the second magnetic component, and the rotary table can rotate in the containing groove.

The adsorption block 51 is formed with a first chamber and a second chamber, which are symmetrically arranged at two sides of the accommodating groove, one ends of the first chamber and the second chamber are provided with openings, and the first magnetic component and the second magnetic component are respectively inserted into the first chamber and the second chamber. Thereby facilitating replacement of the magnetic assembly.

Specifically, the magnetic assembly includes a mounting plate 55, and the shape of the mounting plate 55 is adapted to the shape of the cavity of the suction block 51, so as to perform plugging. The mounting plate 55 is provided with a mounting groove 551, and a magnet 56 is provided in the mounting groove 551. When the magnet 56 is mounted into the mounting groove 551, the magnet 56 protrudes from the mounting groove 551, facilitating the replacement of the magnet 56 by a user.

The number of the installation grooves 551 may be one, two or more, and the number of the magnets 56 may be the same as or different from the number of the installation grooves 551, and may be arbitrarily changed according to the needs of the user.

Wherein, not only the number of the magnets 56 can be increased or decreased according to the needs of the user, but also the magnetism of the single magnets 56 can be replaced according to the needs of the user so as to meet the training needs of different users.

After the user selects the number of magnets 56 and the magnetic force value of the magnet 56 according to the requirement of the current training, one end of the mounting plate 55 is inserted into the opening of the first chamber or the second chamber, and the mounting plate 55 is pushed until the mounting plate 55 is completely inserted into the first chamber or the second chamber, and then the magnetic assembly and the adsorption block 51 are assembled.

The adsorption block 51 is provided with a mounting hole 512 at a side close to the rotor 4, and the mounting position of the mounting hole 512 corresponds to the mounting position of the mounting groove 551 on the mounting plate 55, so that the mounting plate 55 is inserted into the first cavity or the second cavity, and the magnet 56 protruding from the end surface of the mounting plate 55 is matched with the mounting hole 512, so that the magnetic force of the magnet 56 is ensured not to be interfered by the adsorption block 51 serving as a shell.

And along with the body building stage and promotion of the user, the resistance device 5 is required to be adjusted according to the training requirement of the user, so that the resistance is adjusted to meet the use requirements of different users. Therefore, the purpose of adjustable resistance is achieved by changing the contact area of the magnetic field generated by the rotating member 4 and the adsorbing block 51.

As shown in fig. 7 and 8, the resistance device 5 further includes an adjusting mechanism 54, and the adjusting mechanism 54 adjusts the distance between the suction block 51 and the rotating member 4, thereby adjusting the resistance.

Specifically, the adjusting mechanism 54 includes a sleeve 53, the sleeve 53 is fixedly connected to one side of the adsorption block 51, and the sleeve 53 is in threaded connection with a screw 541; thereby rotating the screw 541 and driving the sleeve 53 to move, thereby driving the adsorption block 51 to move, thereby adjusting the magnitude of the resistance. When the sleeve 53 stops rotating, the relative distance between the rotating member 4 and the adsorption block 51 is fixed, so that the resistance is constant; when the pull cord 3 is pulled, a fixed resistance value is generated.

The adjustment knob 543 is rotated to drive the screw 541 to rotate, thereby realizing the movement of the sleeve 53, and further adjusting the movement of the suction block 51 on the bottom case 11.

The adjusting mechanism 54 is arranged on the bottom shell 11, and a through hole is formed in the side wall of the bottom shell 11; one end of the screw 541 is provided with a connection column 542, the connection column 542 penetrates through the through hole, one side of the connection column 542 is provided with an adjusting knob 543, the adjusting knob 543 is arranged on the outer wall of the bottom shell 11, and accordingly a user rotates the adjusting knob 543 to drive relative rotation of the screw 541 and the sleeve 53, and movement between the adsorption block 51 and the turntable is achieved.

The side wall of the sleeve 53 is provided with a reinforcing plate 52, and the reinforcing plate 52 is provided with a weight-reducing hole, so that the sleeve 53 is prevented from being broken during the rotation of the screw 541 in order to increase the strength of the sleeve 53.

Referring to fig. 9, in order to restrict the moving direction of the adsorption block 51, a first limiting groove 111 is formed in a fixing block of the bottom case 11, a second limiting groove 122 is formed in a fixing block of the cover 12, guide blocks 511 are respectively formed at upper and lower end surfaces of the adsorption block 51, and the guide blocks 511 are slidably connected with the limiting grooves, so that the guide blocks 511 move in the first limiting groove 111 and the second limiting groove 122.

In order to adapt to the shape of the turntable, the contact area between the sector-shaped adsorption block 51 and the turntable can be maximized in the process of relative movement of the turntable and the adsorption block 51, so that the sector-shaped adsorption block 51 and the turntable interact with each other, and the contact area between the sector-shaped adsorption block and the circular adsorption block is maximized at a certain same position, so that the generated magnetic force is maximized.

Of course, the shape of the adsorption block 51 may be square, oval, diamond, etc., and the shape of the turntable and the shape of the adsorption block 51 may be adapted at this time, which is not limited herein, and may be set to different shapes according to different requirements.

In summary, the resistance device 5 generates resistance by the magnetic field, rather than gravity, and the limited floor space of the chest expander is reduced. And resistance is adjustable, is convenient for change magnetic component, can adjust to different demands. And the symmetrically arranged magnetic components ensure the stress balance of the rotating piece 4 and improve the handfeel of the pull rope.

As shown in fig. 10, the reset device 6 includes an elastic member having one end fixed to the platform body 1 and the other end fixed to the wire wheel 2, thereby driving the wire wheel 2 to be reset. Specifically, the elastic member is a coil spring 61. The bottom case 11 is fixedly connected with an assembly groove 62, one end of the coil spring 61 is inserted into a notch 621 in the inner wall of the assembly groove 62, and the other end is inserted into a radial groove 231 of the second rotating shaft 23. The coil springs 61 are all installed and fixed by the prior art, and the present embodiment will not be described in detail. And the assembly groove 62 is fixedly connected with a limit cover 63, and the limit cover 63 seals the assembly groove 62 and is provided with a through hole for the second rotating shaft 23 to penetrate. In addition, an elastic member such as a torsion spring may be used in addition to the coil spring 61.

In order to control the sizes of the rotating piece 4 and the wire wheel 2, as shown in fig. 3 and 11, a unidirectional piece is linked between the rotating piece 4 and the wire wheel 2, when a pull rope is used, the wire wheel 2 and the rotating piece 4 are fixed by the unidirectional piece, and the pull force of the pull rope overcomes the restoring force and the resistance to drive the wire wheel 2 to rotate positively; when the rope is wound, the unidirectional piece enables the rotating piece 4 to be rotationally connected with the wire wheel 2, and the restoring force drives the wire wheel 2 to reversely rotate and reset.

In a word, due to the effect of the unidirectional piece, when the wire wheel 2 rotates positively, the wire wheel 2 and the rotating piece 4 are fixed, and the restoring force and the resistance can be transmitted to the wire wheel 2, so that the movement quantity is improved; when the wire wheel 2 rotates reversely, the rotating piece 4 is rotationally connected with the wire wheel 2, so that the resistance cannot be transmitted to the wire wheel 2, and the reset force is not blocked by the resistance, thereby ensuring smooth rope winding action.

The forward rotation and the reverse rotation are required to be performed in the rotation direction. The forward rotation can be clockwise rotation, and the reverse rotation can be anticlockwise rotation; the rotation in the forward direction can be counterclockwise rotation, and the rotation in the reverse direction can be clockwise rotation.

As shown in fig. 11 to 15, the unidirectional member is a unidirectional bearing 21, and the unidirectional bearing 21, the wire wheel 2 and the rotating member 4 are sleeved with each other. Specifically, a positioning hole 22 is formed at one end of the wire wheel 2, and the outer ring of the one-way bearing 21 is sleeved in the positioning hole 22. The rotating member 4 is provided with a connecting shaft 41, and the connecting shaft 41 is sleeved in the inner ring of the one-way bearing 21.

In order to prevent mutual sliding, an inner key 221 is formed on the inner wall of the positioning hole 22, an outer groove 211 is formed on the outer ring of the unidirectional bearing 21, and the inner key 221 is inserted into the outer groove 211, so that the unidirectional bearing 21 and the wire wheel 2 are circumferentially fixed through key connection. The connecting shaft 41 is formed with an outer key 411 on the side surface, the inner ring of the one-way bearing 21 is provided with an inner groove 212, and the outer key 411 is inserted into the inner groove 212, so that the one-way bearing 21 and the rotating member 4 are fixed in the circumferential direction through key connection.

In addition, the one-way member may be a ratchet mechanism or the like, in addition to the one-way bearing 21.

The end of the rotating member 4 far away from the reel 2 is formed with a first rotating shaft 42, the end of the reel 2 far away from the rotating member 4 is formed with a second rotating shaft 23, the cover 12 is formed with a first shaft hole 112 for the first rotating shaft 42 to be sleeved, and the bottom shell 11 is formed with a second shaft hole 124 for the second rotating shaft 23 to be sleeved, so that the rotating member 4 and the reel 2 are installed in the platform main body 1.

In summary, the present embodiment employs the one-way bearing 21 to connect the pulley 2 and the rotating member 4. When the pull rope is pulled, the resistance device 5 and the reset device 6 apply force together, so that the body can be exercised more limitedly; when the rope is wound, the resistance device 5 is separated through the one-way bearing 21, and the reset device 6 applies force to enable the wire wheel 2 to rotate, so that smooth winding is ensured.

As shown in fig. 16 to 19, in order to reduce the wear of the pull cord 3, the wire outlet 121 is provided with a wire guide 7, the wire guide 7 includes a slider 71 slidably coupled to one side of the wire outlet 121, the slider 71 is formed with a wire guide 714, the wire guide 714 is provided to pass through the pull cord 3, so that the slider 71 slides along the wire outlet 121 with the pull cord 3 as the pull cord 3 is pulled, and the pull cord 3 is guided through the wire guide 714 to protrude from the wire outlet 121 out of the platform body 1, thereby preventing friction between the pull cord 3 and the side wall of the wire outlet 121. The wire channel 714 may be a solid or a virtual body, and refers to a path through which the pull cord 3 passes.

The sliding friction may be changed to rolling friction to further reduce friction. Therefore, the movable pulley 712 is rotatably connected to the slider 71, and the rope 3 passes around the movable pulley 712 and extends out of the platform body 1 from the outlet 121. To limit the pull cord 3, the movable pulleys 712 are disposed opposite to each other, and the wire passage 714 is disposed between the movable pulleys 712 on both sides. And the side of the movable pulley 712 is formed with a first notch 7121, the first notch 7121 is circumferentially arranged around the movable pulley 712, and the first notches 7121 on both sides are spliced into the wire passage 714.

The slider 71 includes a carriage 711, the carriage 711 being provided with a first shaft 713, and the movable pulley 712 being mounted on the first shaft 713. Generally, the first shaft body 713 and the sliding frame 711 are rotatably connected, and the movable pulley 712 and the first shaft body 713 are fixed or even integrally provided, but the first shaft body 713 and the sliding frame 711 may be fixedly connected, and the movable pulley 712 is sleeved on the first shaft body 713.

In order to realize the above-described sliding structure, the docking main body 1 is provided with a rail 72 provided along the outlet 121, and the slider 71 is slidably coupled to the rail 72. The guide rail includes a first side frame 721 and a second side frame 722, the first side frame 721 forming a first chute 7211; the second side frame 722 is formed with a second chute 7221, and the first chute 7211 and the second chute 7221 are arranged opposite to each other, and both ends of the fixed sheave 731 are respectively arranged in the first chute 7211 and the second chute 7221.

The first side frame 721 is fixed to the bottom chassis 11 by a screw, and the second side frame 722 is fixed to the first side frame 721 by a screw, thereby forming the track 72.

In order to prevent the pull rope 3 from winding into other devices in the platform body 1, one end of the outlet 121 is provided with a positioning piece 73, the positioning piece 73 is provided with a limiting opening 733, and the pull rope 3 extends out of the limiting opening 733 and then penetrates through the outlet 121 through a wire channel 714.

Similarly, the positioning member 73 is rotatably connected to the fixed pulley 731, and the pulling rope 3 passes around the fixed pulley 731 and enters the limiting opening 733. To limit the pull rope 3, the fixed pulleys 731 are arranged opposite to each other, and the limiting opening 733 is located between the fixed pulleys 731 on both sides. And the side surface of the fixed pulley 731 is provided with a second notch 7311, the second notch 7311 is circumferentially arranged around the fixed pulley 731, and the second notches 7311 on both sides are spliced into the limit opening 733.

Since the wire wheel 2 and the rotating member 4 are horizontally disposed in the platform body 1 and the wire outlet 121 is positioned at the top of the platform body 1, the fixed pulley 731 simultaneously plays a role of reversing, so that the axial direction of the fixed pulley 731 is oriented toward the wire outlet 121, i.e., the fixed pulley 731 and the movable pulley 712 are disposed perpendicular to each other.

Specifically, one end of the outlet 121 is fixedly connected with the fixing frame 74, and the fixed pulley 731 is rotatably connected to the fixing frame 74. The fixed frame 74 is provided with a second shaft 732, and the fixed pulley 731 is mounted on the second shaft 732. Generally, the second shaft 732 is rotatably connected to the fixing frame 74, and the fixed pulley 731 is fixed to the second shaft 732, or even integrally formed therewith, but the second shaft 732 may be fixedly connected to the fixing frame 74, and the fixed pulley 731 is sleeved on the second shaft 732.

In order to realize the structure of the fixing frame 74, the fixing frame 74 includes a sub-frame 741 fixed to the platform body 1, the sub-frame 741 is detachably connected to a side plate 742, and one end of the second shaft 732 is mounted on the side plate 742. Here, the sub-frame 741 may be integrally formed with the first side frame 721 for convenience of processing. And the side plate 742 is detachably connected with the sub-frame 741, so that the fixed pulley 731 and the rotating shaft are conveniently installed and fixed. Typically, side plates 742 are secured to the side of sub-frame 741 adjacent track 72 to limit the position of fixed sheave 731.

In summary, the wire guide device 7 guides the pull rope 3 to adapt to the miniaturized and flattened platform main body 1, and ensure the normal pulling of the pull rope 3.

In addition, in order to enable the user to pull the pull rope 3 by both arms, the wire wheel 2, the pull rope 3, the resistance device 5, the reset device 6 and the wire device 7 in the platform main body 1 are arranged in a mirror image mode, so that both arms can be exercised at the same time without changing hands.

In addition, the cover 12 is provided with a plurality of mounting posts 123, and a plurality of mounting holes 512 are formed in positions corresponding to the mounting posts 123 on the bottom shell 11, and the bottom shell 11 and the cover 12 are fixedly connected through screws, so that the whole assembly of the chest expander is realized.

The utility model has been further described with reference to specific embodiments, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the utility model, but rather as providing those skilled in the art with the benefit of this disclosure with the benefit of their various modifications to the described embodiments.

Claims

1. The chest expander is characterized by comprising a platform main body, wherein the platform main body is rotationally connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with an outlet which is used for the pull rope to extend out;

one side of the outlet is connected with a sliding part in a sliding way, and the sliding part is provided with a wire channel which is used for the stay cord to penetrate; the sliding piece slides along the wire outlet along with the pull rope when the pull rope is pulled, and the pull rope stretches out of the platform main body from the wire outlet after being guided by the wire guide channel;

the platform main body is used for a user to stand so as to fix the platform main body, and the wire wheel is pulled out to drive the wire wheel to rotate.

2. The chest expander of claim 1 wherein the reel is disposed horizontally within the platform body.

3. The chest expander of claim 1 wherein the reel is provided with a rotatable member, and wherein the platform body is provided with a resistance means therein which attracts the rotatable member to apply resistance to the rotatable member to resist rotation of the rotatable member.

4. A chest expander according to claim 3, wherein the resistance means comprises a first magnetic assembly and a second magnetic assembly, the first magnetic assembly and the second magnetic assembly being disposed at respective axial ends of the rotatable member, the first magnetic assembly and the second magnetic assembly providing the same resistance to the rotatable member.

5. A chest expander according to claim 3, wherein the resistance means comprises an adsorption block provided with a hollow chamber in which the magnetic assembly is detachably mounted, the rotation member and the adsorption block being attracted to each other to generate the magnetic field.

6. The chest expander of claim 5 wherein the hollow chamber is provided with an opening at one end, and the magnetic assembly is inserted through the opening and mounted into the hollow chamber.

7. The chest expander of claim 5 wherein the magnetic assembly comprises a mounting plate to which the magnet is removably attached.

8. A chest expander according to claim 3 wherein the resistance means comprises a movable magnetically attractable mass which moves to vary the spacing of the magnetically attractable mass from the rotatable member to adjust the resistance.

9. The tensioner as in claim 8, wherein the resistance means comprises a sleeve threaded with a screw rotatably coupled to the platform body, one end of the sleeve being fixed to the magnetic attraction block.

10. A chest expander according to claim 3 wherein the platform body is provided with a reset means which applies a return force to the reel.

11. The chest expander of claim 10 wherein the return means comprises an elastic member having one end secured to the platform body and the other end secured to the reel.

12. The chest expander of claim 10 wherein a unidirectional member is coupled between the rotatable member and the pulley; when the pull rope is used, the unidirectional piece enables the wire wheel and the rotating piece to be fixed, and the pull force of the pull rope overcomes the restoring force and the resistance to drive the wire wheel to rotate positively; when the rope is wound, the unidirectional piece enables the rotating piece to be connected with the wire wheel in a rotating way, and the restoring force enables the wire wheel to reversely rotate and reset.

13. The chest expander of claim 1 wherein the slider is rotatably coupled to the movable pulley about which the pull cord passes.

14. The chest expander according to claim 1, wherein the positioning member is arranged at one end of the wire outlet, the positioning member is provided with a limiting opening, and the pull rope extends out of the limiting opening and then penetrates the wire outlet through the wire guide channel.

15. The chest expander of claim 14 wherein the positioning member is rotatably coupled to the fixed pulley and the pull cord passes around the fixed pulley and into the limit port.