CN113457064A

CN113457064A - Chest expander

Info

Publication number: CN113457064A
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: 2021-10-01
Anticipated expiration: 2041-06-30
Also published as: CN113457064B

Abstract

The invention discloses a chest expander which comprises a platform main body, wherein the platform main body is rotatably connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with a wire outlet for the stretching rope to extend out; therefore, 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 provided by the invention does not need to depend on the large size of the appliance, and the stability is ensured by depending on the weight of a user.

Description

Chest expander

Technical Field

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

Background

With the continuous improvement of living standard, people pay more and more attention to physical exercise, so more and more fitness equipment appears in our lives. Especially, home fitness equipment is gradually favored by people, and people can be trained to a certain extent in environments with small space such as home or office based on miniaturization of products and simplification of operation.

The chest developer is an appliance suitable for mass body building and exercising. The user sets different use modes according to the training requirements of the user, and mainly trains different muscles of the body. Particularly, the chest developer can be used for chest training, arm training and the like, and good body shape is shaped, so that the effect of body building in a gymnasium is achieved.

But current chest expander, the source of solving gravity relies on the counter weight piece, and the large-scale volume of apparatus itself is relied on to apparatus stability, does not conform to domestic appliance safety, and occupation space is little, nimble portable's demand.

Disclosure of Invention

The invention provides a chest expander, which does not need large-scale stability of an apparatus body. The specific technical scheme is as follows:

a chest expander comprises a platform main body, wherein the platform main body is rotatably connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with a wire outlet for the stretching rope to extend out; therefore, 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 wire wheel is horizontally arranged in the platform main body.

Further, be equipped with on the line wheel and rotate the piece, be equipped with resistance device in the platform main part, resistance device adsorbs and rotates the piece to exert the resistance to rotating the piece, hinder to rotate a rotation.

Furthermore, the resistance device comprises a first magnetic assembly and a second magnetic assembly, the first magnetic assembly and the second magnetic assembly are respectively arranged at two axial ends of the rotating piece, and the resistance of the first magnetic assembly and the resistance of the second magnetic assembly to the rotating piece are the same.

Furthermore, resistance device is provided with well plenum chamber including adsorbing the piece on adsorbing the piece, and the detachable installs magnetic component in the well plenum chamber, rotates the piece and adsorbs the piece and adsorb each other and produce the magnetic field.

Furthermore, one end of the hollow cavity is provided with an opening, and the magnetic assembly is inserted from the opening and is installed in the hollow cavity.

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 as to change the distance between the magnetic adsorption block and the rotating piece and adjust the resistance.

Further, resistance device includes the sleeve, and sleeve threaded connection has the screw rod, and screw rod and platform main part rotate to be connected, and sleeve one end and magnetic adsorption piece are fixed.

Furthermore, a reset device is arranged in the platform main body and exerts restoring force on the wire wheel.

Further, resetting means includes the elastic component, and elastic component one end and platform main part are fixed, and the other end is fixed with the line wheel.

Furthermore, a one-way piece is linked between the rotating piece and the wire wheel; when pulling the rope, the unidirectional component fixes the wire wheel and the rotating component, and the pulling force of the pulling rope overcomes the restoring force and the resistance force to drive the wire wheel to rotate in the positive direction; when the rope is collected, the one-way piece enables the rotating piece to be rotationally connected with the wire wheel, and the restoring force enables the wire wheel to reversely rotate and reset.

Furthermore, one side of the wire outlet is connected with a sliding piece in a sliding manner, the sliding piece is provided with a wire channel, and the wire channel is used for the stay cord to penetrate through; therefore, the sliding piece slides along the wire outlet along with the pulling rope when the pulling rope is pulled, and the pulling rope extends out of the platform main body from the wire outlet after being guided by the wire guide channel.

Furthermore, the sliding part is rotatably connected with a movable pulley, and the pull rope is wound around the movable pulley.

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

Furthermore, the positioning piece is rotatably connected with a fixed pulley, and the pull rope bypasses the fixed pulley and enters the limiting opening.

The chest developer has the following technical effects:

1. stand on the main part of standing through the user, utilize the fixed platform of standing of user's weight to abandon the stability of relying on the large-scale volume of apparatus itself, can be with whole chest expander miniaturization, flattening.

2. The line wheel is horizontally arranged, so that the magnetic resistance device and the resetting device of the elastic piece are adopted, the chest expander can be miniaturized, and the chest expander can be accommodated in the lower space of a home bottom such as a sofa.

3. Through the resistance balance of rotating the both sides for the rotation piece atress of both sides simultaneous atress is even, and the user is at the in-process commentaries on classics piece of pull stay cord and is difficult to take place to deflect.

4. Simplify the installation and the dismantlement step of magnet, be convenient for adjust the magnet, can be according to user's health quality diverse, change magnetic component, satisfy different users' user demand.

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

6. Under the action of the one-way piece, when the wire wheel rotates in the positive direction, the wire wheel and the rotating piece are fixed, and both restoring force and resistance can be transmitted to the wire wheel, so that the amount of exercise is improved; when the wire wheel rotates reversely, the rotating piece is connected with the wire wheel in a rotating mode, so that resistance cannot be transmitted to the wire wheel, and therefore the reset force is not hindered by the resistance, and smooth rope winding can be guaranteed.

7. By arranging the sliding piece, the movable pulley and the fixed pulley, the contact between the pull rope and the side wall of the opening is reduced by the guiding of the sliding piece, 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, sliding friction is changed into rolling friction, so that the exploration of friction force is reduced, and the service life of the pull rope is prolonged; the fixed pulley guides and turns to the stay cord, prevents that the stay cord from loosening the back, twines in the platform main part.

Drawings

Fig. 1 is a schematic view of the external structure of the chest expander in the present invention;

fig. 2 is a schematic view of the internal structure of the chest expander in the present invention;

fig. 3 is a cross-sectional view of the chest expander of the present invention;

FIG. 4 is a schematic view of the adsorption block structure of the present invention;

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

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

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

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

FIG. 9 is a schematic view of a spacing groove structure according to the present invention;

FIG. 10 is a schematic view of the mounting structure of the resetting device in the present invention;

FIG. 11 is an exploded view of the reel and rotor of the present invention;

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

FIG. 13 is a schematic view of a rotating member according to the present invention;

FIG. 14 is a schematic view of the construction of the reel of the present invention;

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

FIG. 16 is a schematic view of a pull cord routing in accordance with the present invention;

FIG. 17 is an enlarged view of portion A of FIG. 16;

FIG. 18 is a schematic view of a slider according to the present invention;

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

Description of the drawings:

1. a platform main body;

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

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

2. a wire wheel;

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

3. pulling a rope; 31. a handle;

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

5. a resistance device;

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

6. a resetting device; 61. a coil spring; 62. assembling a groove; 621. a recess; 63. a limiting cover;

7. a wire guide device;

71. a slider; 711. a carriage; 712. a movable pulley; 7121. a first notch; 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 member; 731. a fixed pulley; 7311. a second recess; 732. A second shaft body; 733. a limiting port; 74. a fixed mount; 741. a sub-frame; 742. side plates.

Detailed Description

For a better understanding of the objects, functions, and details of the design of the chest developer of the present invention, reference will now be made in detail to the chest developer of the present invention, which is illustrated in the accompanying drawings.

As shown in fig. 1 to 3, a chest expander includes a platform 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 body 1 is provided with a wire outlet 121, and the pull rope 3 extends out of the turntable body from the wire 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, the pull rope 3 is pulled out of the wire wheel 2 through the handle 31 to drive the wire wheel 2 to rotate positively, and the effect of training strength is achieved. Thus, the weight of the platform body 1 is fixed, not the weight of the platform body 1 itself, by the user's gravity. Further, the usage environment of the platform body 1 is not limited at all, and the chest developer can be placed anywhere with a flat surface.

The platform body 1 is a housing including a bottom case 11 and a cover 12. The platform body 1 is also provided with a resistance device 5 and a return device 6. The resetting device 6 applies restoring force to the wire wheel 2 to enable the wire wheel 2 to rotate reversely; the wire wheel 2 is provided with a rotating part 4, and the rotating part 4 is generally a rotating disc. The resistance device 5 applies resistance to the rotation member 4, and blocks the rotation member 4 from rotating. So that the user needs to overcome the restoring force and the resistance when pulling the pull rope 3 to achieve the purpose of training.

In addition, the reel 2 and the rotor 4 are horizontally disposed in the platform main body 1 in view of miniaturization and flattening of the platform 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 rotation body, thereby generating resistance. And the rotating disk is made of magnetic metal, such as iron, steel and the like.

Furthermore, the adsorption block 51 is provided with 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 member 4, and the resistances of the first magnetic component and the second magnetic component to the two ends of the rotating member 4 are the same. Thereby ensuring that the rotating part 4 is stressed evenly in the axial direction and rotates stably. Therefore, a containing groove is formed between the first magnetic assembly and the second magnetic assembly, and the rotary disc can rotate in the containing groove.

The adsorption block 51 is formed with a first chamber and a second chamber, the first chamber and the second chamber are symmetrically arranged at two sides of the accommodating groove, one end of the first chamber and one end of the second chamber are provided with openings, and the first magnetic assembly and the second magnetic assembly 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 adsorption block 51, so as to perform plugging. The mounting plate 55 is provided with a mounting groove 551, and the magnet 56 is provided in the mounting groove 551. When the magnet 56 is mounted in the mounting groove 551, the magnet 56 is protruded from the mounting groove 551, so that the user can replace the magnet 56.

The number of the mounting grooves 551 may be one, two or more, and is not limited specifically herein, the number of the magnets 56 may be one, two or more, the number of the magnets 56 may be the same as or different from the number of the mounting grooves 551, and the magnets may be replaced arbitrarily according to the user's requirement.

Wherein, not only the quantity of magnet 56 can be increased or decreased according to user's demand, the magnetism of single magnet 56 can also be changed according to user's demand to satisfy different user's training demand.

After the user selects the number of the magnets 56 and the magnetic force value of the single magnets 56 according to the requirement of the training, one end of the mounting plate 55 is inserted into the opening of the first chamber or the second chamber, the mounting plate 55 is pushed until the mounting plate 55 is completely inserted into the first chamber or the second chamber, and at this time, the assembly of the magnetic assembly and the adsorption block 51 is completed.

The adsorption block 51 is provided with a mounting hole 512 at one side close to the rotating body 4, the mounting hole 512 is arranged at a position corresponding to the mounting groove 551 on the mounting plate 55, so that the mounting plate 55 is inserted into the first chamber or the second chamber, the magnet 56 protruding out of the end surface of the mounting plate 55 is matched with the mounting hole 512, and the magnetic force of the magnet 56 is ensured not to be interfered by the adsorption block 51 as a housing.

And the resistance device 5 is required to be adjusted according to the training requirements of the user along with the body-building stage and promotion of the user, so that the resistance is adjusted to meet the use requirements of different users. Therefore, the contact area of the rotating member 4 and the absorption block 51 generating the magnetic field is changed to achieve the purpose of adjusting the resistance.

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 absorption block 51 and the rotation member 4, thereby adjusting the magnitude of 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 absorption block 51 to move and further adjusting the resistance. When the sleeve 53 stops rotating, the relative distance between the rotating part 4 and the absorption block 51 is fixed, so that the resistance is constant; when the pull cord 3 is pulled, a fixed resistance value is generated.

The adjusting knob 543 is rotated to drive the screw 541 to rotate, so that the sleeve 53 moves, and the adsorbing block 51 moves on the bottom shell 11.

The adjusting mechanism 54 is installed 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 connecting column 542, the connecting column 542 penetrates through the through hole, one side of the connecting column 542 is provided with an adjusting knob 543, the adjusting knob 543 is arranged on the outer wall of the bottom shell 11, so that the user rotates the adjusting knob 543 to drive the screw 541 and the sleeve 53 to rotate relatively, and the adsorption block 51 and the turntable are moved.

The side wall of the sleeve 53 is provided with a reinforcing plate 52, and the reinforcing plate 52 is provided with a lightening hole, so that the strength of the sleeve 53 is increased, and the sleeve 53 is prevented from being broken in the process of rotating the screw 541.

Referring to fig. 9, in order to restrict the moving direction of the adsorption block 51, a first limiting groove 111 is disposed on the fixing block of the bottom case 11, a second limiting groove 122 is disposed on the fixing block of the cover 12, guide blocks 511 are disposed on 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.

Furthermore, in order to adapt to the shape of the turntable, the sector-shaped adsorption blocks 51 and the turntable can maximize the contact area between the turntable and the adsorption blocks 51 during the relative movement, so that the two interact with each other, and at a certain same position, the sector-shaped and circular contact area is the largest, and the generated magnetic force is the largest.

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

In conclusion, the resistance device 5 generates resistance through the magnetic field instead of gravity, and the floor area of the chest developer is limited and small. And the resistance is adjustable, is convenient for change magnetic component, can adjust to different demands. And the magnetic components which are symmetrically arranged ensure that the stress of the rotating part 4 is balanced, and the hand feeling of the pull rope is improved to a limited extent.

As shown in fig. 10, the resetting device 6 includes an elastic member, one end of the elastic member is fixed to the platform main body 1, and the other end of the elastic member is fixed to the reel 2, so as to drive the reel 2 to reset. Specifically, the elastic member is a coil spring 61. The bottom case 11 is fixedly coupled with a fitting groove 62, and one end of the coil spring 61 is inserted into a recess 621 formed in an inner wall of the fitting groove 62, and the other end thereof is inserted into the radial groove 231 of the second rotating shaft 23. The coil spring 61 is fixed and installed by the prior art, and the detailed description is omitted. And the assembling groove 62 is further fixedly connected with a limiting cover 63, and the limiting cover 63 closes the assembling groove 62 and is provided with a through hole for the second rotating shaft 23 to penetrate through. In addition, instead of the coil spring 61, an elastic member such as a torsion spring may be used.

In order to control the sizes of the rotating piece 4 and the wire wheel 2, as shown in fig. 3 and fig. 11, a one-way piece is linked between the rotating piece 4 and the wire wheel 2, when pulling a rope, the one-way piece fixes the wire wheel 2 and the rotating piece 4, and the pulling force of the pulling rope overcomes the restoring force and the resistance force to drive the wire wheel 2 to rotate positively; when the rope is collected, the one-way 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, under the action of the one-way piece, when the wire wheel 2 rotates in the positive direction, the wire wheel 2 and the rotating piece 4 are fixed, and both restoring force and resistance can be transmitted to the wire wheel 2, so that the amount of exercise is improved; when the reel 2 rotates reversely, the rotating piece 4 is connected with the reel 2 in a rotating way, so that the resistance cannot be transmitted to the reel 2, and the restoring force is not hindered by the resistance, thereby ensuring that the rope winding action is smoothly carried out.

Wherein, the rotation direction can be achieved by the forward rotation and the reverse rotation. The forward rotation can be clockwise rotation, and the reverse rotation can be anticlockwise rotation; the rotation can be clockwise in the forward direction and clockwise in the reverse direction.

Referring to fig. 11 to 15, the one-way element is a one-way bearing 21, and the one-way bearing 21, the pulley 2 and the rotating element 4 are sleeved with each other. Specifically, one end of the reel 2 is formed with a positioning hole 22, 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 one-way bearing 21, and the inner key 221 is inserted into the outer groove 211, so that the one-way bearing 21 and the reel 2 are circumferentially fixed through key connection. The side of the connecting shaft 41 is formed with an outer key 411, the inner ring of the one-way bearing 21 is opened with an inner groove 212, the outer key 411 is inserted in the inner groove 212, thereby circumferentially fixing the one-way bearing 21 and the rotating member 4 through the key connection.

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

One end of the rotating member 4, which is far away from the reel 2, is formed with a first rotating shaft 42, one end of the reel 2, which is 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 rotor 4. When the 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 taken up, the unidirectional bearing 21, the separation resistance device 5 and the reset device 6 apply force to make the wire wheel 2 rotate, so that the smooth take-up is ensured.

As shown in fig. 16 to 19, in order to reduce the wear of the pull rope 3, the outlet 121 is provided with a wire guiding device 7, the wire guiding device 7 includes a sliding member 71 slidably connected to one side of the outlet 121, the sliding member 71 is formed with a wire guiding channel 714, the wire guiding channel 714 is used for the pull rope 3 to pass through, so that when the pull rope 3 is pulled, the sliding member 71 slides along the outlet 121 along with the pull rope 3, and after the pull rope 3 is guided by the wire guiding channel 714, the platform body 1 extends out of the outlet 121, thereby preventing the friction between the pull rope 3 and the side wall of the outlet 121. The wire passage 714 may be a solid body or a virtual body, and refers to a path through which the pull rope 3 passes.

Sliding friction may be changed to rolling friction to further reduce friction. Therefore, the slider 71 is rotatably connected to the movable pulley 712, and the rope 3 is passed around the movable pulley 712 and is drawn out of the platform body 1 through the outlet 121. To limit the pulling rope 3, the movable pulleys 712 are disposed opposite to each other, and the wire passage 714 is provided 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 arranged around the circumference of the movable pulley 712, and the first notches 7121 at both sides are spliced to form the wire channel 714.

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

In order to realize the above sliding structure, the platform 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 runner 7211; the second side frame 722 is formed with a second sliding groove 7221, the first sliding groove 7211 and the second sliding groove 7221 are oppositely disposed, and both ends of the fixed pulley 731 are respectively erected in the first sliding groove 7211 and the second sliding groove 7221.

The first side frame 721 is fixed to the bottom case 11 by screws, and the second side frame 722 is fixed to the first side frame 721 by screws, thereby forming the rail 72.

In order to prevent the pull rope 3 from winding in the platform main body 1 and entering other devices, a positioning member 73 is disposed at one end of the wire outlet 121, a limiting opening 733 is disposed on the positioning member 73, and the pull rope 3 extends out of the limiting opening 733 and then penetrates through the wire outlet 121 through the wire channel 714.

Similarly, the positioning member 73 is rotatably connected with a fixed pulley 731, and the pulling rope 3 passes around the fixed pulley 731 and enters the limiting opening 733. In order to limit the pulling rope 3, the fixed pulleys 731 are arranged oppositely, and the limiting opening 733 is located between the fixed pulleys 731 on the two sides. And a second notch 7311 is formed on the side surface of the fixed pulley 731, the second notch 7311 is circumferentially arranged around the fixed pulley 731, and the second notches 7311 on both sides are spliced to form the limiting opening 733.

Since the pulley 2 and the rotating member 4 are horizontally disposed in the platform main body 1 and the outlet 121 is located at the top of the platform main body 1, the fixed pulley 731 also performs a reversing function, so that the axial direction of the fixed pulley 731 is directed toward the outlet 121, that is, 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 to the fixing frame 74, and the fixed pulley 731 is rotatably connected to the fixing frame 74. The second shaft 732 is mounted on the fixing frame 74, and the fixed pulley 731 is attached to the second shaft 732. Generally, the second shaft 732 is rotatably connected to the fixed frame 74, and the fixed pulley 731 and the second shaft 732 are fixed or even integrally disposed, but the second shaft 732 may also be fixedly connected to the fixed frame 74, and the fixed pulley 731 is sleeved on the second shaft 732.

In order to realize the above-mentioned structure of the fixing frame 74, the fixing frame 74 includes a sub-frame 741 fixed to the platform main 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. The sub-frame 741 may be integrally formed with the first side frame 721 for convenience of processing. The side plate 742 is detachably connected with the sub-frame 741, so that the fixed pulley 731 and the rotating shaft can be conveniently installed and fixed. Generally, side plate 742 is fixed to sub-frame 741 on the side closer to rail 72 to regulate the position of fixed pulley 731.

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

In addition, in order to enable both arms of a user to pull the pull rope 3, 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 simultaneously without changing hands.

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

The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.

Claims

1. A chest expander is characterized by comprising a platform main body, wherein the platform main body is rotatably connected with a wire wheel, and a pull rope is wound on the wire wheel; the platform main body is provided with a wire outlet for the stretching rope to extend out; therefore, 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.

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

3. The tension device as claimed in claim 1, wherein the reel is provided with a rotary member, and the platform body is provided with a resistance device which attracts the rotary member to apply resistance to the rotary member to hinder the rotary member from rotating.

4. A chest expander as claimed in claim 3 wherein the resistance means comprises first and second magnetic members disposed at respective axial ends of the rotatable member, the first and second magnetic members providing the same resistance to the rotatable member.

5. A chest expander as claimed in claim 3, wherein the resistance means comprises an adsorption block having a hollow chamber, a magnetic member is detachably mounted in the hollow chamber, and the rotary member and the adsorption block are attracted to each other to generate a magnetic field.

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

7. The chest expander of claim 5 wherein the magnet assembly comprises a mounting plate having a magnet removably attached thereto.

8. A chest expander as claimed in claim 3 wherein the resistance means comprises a movable magnetically attractive piece which moves to vary the spacing between the magnetically attractive piece and the rotatable member to adjust the resistance.

9. The chest expander of claim 8 wherein the resistance means comprises a sleeve having a threaded rod in threaded engagement, the threaded rod being rotatably connected to the platform body, one end of the sleeve being secured to the magnetically attractable piece.

10. A chest expander as claimed in claim 3, wherein return means are provided in the docking station body, the return means applying a return force to the wire wheel.

11. The chest expander of claim 10 wherein the return means comprises a resilient 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 one-way member is linked between the rotary member and the pulley; when pulling the rope, the unidirectional component fixes the wire wheel and the rotating component, and the pulling force of the pulling rope overcomes the restoring force and the resistance force to drive the wire wheel to rotate in the positive direction; when the rope is collected, the one-way piece enables the rotating piece to be rotationally connected with the wire wheel, and the restoring force enables the wire wheel to reversely rotate and reset.

13. The chest expander as claimed in claim 1, wherein a sliding member is slidably connected to one side of the outlet, the sliding member forming a wire passage through which the pulling rope passes; therefore, the sliding piece slides along the wire outlet along with the pulling rope when the pulling rope is pulled, and the pulling rope extends out of the platform main body from the wire outlet after being guided by the wire guide channel.

14. A chest expander as claimed in claim 13 wherein the slider member is rotatably connected to a movable pulley and the pull cord is passed around the movable pulley.

15. The chest expander as claimed in claim 13, wherein the outlet is provided at one end thereof with a positioning member, the positioning member is provided with a limiting opening, and the pull cord extends from the limiting opening and then passes through the outlet via the wire passage.

16. A chest expander as claimed in claim 15 wherein the retainer is pivotally connected to a fixed pulley and the pull cord passes around the fixed pulley and into the restraint opening.