Leg bending and stretching all-in-one machine

Abstract

The utility model provides a leg flexion and extension all-in-one machine which comprises a body and a swing mechanism, a counterweight assembly is arranged on the body, and the counterweight assembly is in operable linkage with the swing mechanism; the counterweight assembly comprises a connecting arm rotationally connected to the body, a guide part is arranged on the connecting arm in the length direction, a counterweight arm is installed on the guide part, and the counterweight arm can slide along the guide part in a reciprocating mode and can rotate relative to the guide part; the connecting arm is provided with a plurality of first clamping parts, the counterweight arm is provided with second clamping parts matched with the first clamping parts, and the reverse torque of the counterweight arm is dynamically adjusted by utilizing the lever principle, so that continuous switching of different resistance strengths is realized, and a user can accurately adjust the training resistance without increasing or decreasing counterweight sheets; multi-gear fixed adjustment is achieved through the clamping structure between the counterweight arm and the connecting arm, a user can rapidly unlock / lock the device only by rotating the counterweight arm, operation is convenient and fast, stability is high, accidental sliding in the movement process is avoided, and the training efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, specifically to a leg flexion and extension machine. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, fitness equipment has been widely used in daily life; however, existing fitness equipment, such as leg kick machines, has some shortcomings in its weight system.

[0003] Existing technologies, such as US Patent Nos. 7,691,038 and 5,484,365, both propose fitness equipment related to leg flexion and extension exercises. However, the above-mentioned technical solutions all have some drawbacks: users need to purchase various sizes of weights to meet different intensity requirements, resulting in high operating costs and inconvenient storage. Weight adjustment relies on disassembling or stacking fixed weights, which is cumbersome and laborious. Furthermore, weight adjustment can only be achieved by changing the weight setting of the weights, which is inflexible and cannot achieve continuous or fine resistance adjustment, thus affecting training adaptability and efficiency.

[0004] Therefore, it is necessary to propose a new type of integrated leg flexion and extension machine to solve the problems mentioned above. Utility Model Content

[0005] This invention provides a leg flexion and extension integrated machine to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0007] A leg flexion and extension machine includes a main body and a swing mechanism. The main body is provided with a counterweight assembly, which is operablely linked with the swing mechanism. The counterweight assembly includes a connecting arm rotatably connected to the main body. The connecting arm is provided with a guide portion along its length. The counterweight arm is mounted on the guide portion and can slide back and forth along the guide portion and rotate relative to the guide portion. The connecting arm is provided with a plurality of first engaging portions, and the counterweight arm is provided with a second engaging portion that cooperates with the first engaging portions. The second engaging portion can selectively engage with any of the first engaging portions to restrict the sliding of the counterweight arm.

[0008] Preferably, the plurality of first snap-fit ​​parts are snap-fit ​​grooves arranged along the length direction of the connecting arm, and the second snap-fit ​​part is a snap-fit ​​post arranged on the counterweight arm, and the snap-fit ​​post and the snap-fit ​​groove can be snapped together separately.

[0009] Preferably, the guide part is a guide slide rod, and the counterweight arm is slidably connected to the guide slide rod.

[0010] Preferably, the counterweight arm has a first rotation direction and a second rotation direction. When the counterweight arm rotates relative to the guide slide rod in the first rotation direction, the locking pin disengages from the locking groove, and the counterweight arm can slide back and forth along the length of the guide slide rod.

[0011] When the counterweight arm rotates relative to the guide slide in the second rotation direction, the locking pin approaches the locking groove and engages with one of the locking grooves, restricting the counterweight arm from sliding along the length of the guide slide.

[0012] The first rotation direction and the second rotation direction are opposite to each other.

[0013] Preferably, the swing mechanism includes a swing crossbar, a first link and a second link. The first link and the second link are rotatably connected at one end and pivotally connected to the body. The other end of the second link is rotatably connected to the swing crossbar.

[0014] Preferably, a first adjusting mechanism is provided between the first link and the second link for adjusting the included angle between the first link and the second link; and / or

[0015] A second adjustment mechanism is provided between the swing crossbar and the second link to adjust the angle between them.

[0016] Preferably, the first adjustment structure includes a first adjustment disc disposed on the first connecting rod and a first stop lever disposed on the second connecting rod. The first adjustment disc has a plurality of first insertion holes, which are evenly distributed around the circumference of the first adjustment disc. The first stop lever and the first insertion holes can be detachably inserted.

[0017] The second adjustment mechanism includes a second adjustment disc mounted on a swing crossbar and a second stop lever mounted on a second connecting rod. The second adjustment disc has multiple second insertion holes distributed circumferentially along the second adjustment disc, and the second stop lever and the second insertion holes can be detachably inserted.

[0018] Preferably, the first stop lever can be inserted into any of the first insertion holes to restrict the rotation of the first link relative to the second link;

[0019] The second position lever can be inserted into any of the second insertion holes to restrict the rotation of the swing crossbar relative to the second link.

[0020] Preferably, a traction rod is also provided between the connecting arm and the first connecting rod, with one end of the traction rod rotatably connected to the connecting arm and the other end rotatably connected to the first connecting rod.

[0021] This utility model also provides a leg flexion and extension integrated machine, including a main body and a swing mechanism. The main body is provided with a counterweight assembly, which is operablely linked with the swing mechanism. The counterweight assembly includes a connecting arm rotatably connected to the main body. The connecting arm is provided with a guide part along its length direction. The counterweight arm is installed on the guide part. The counterweight arm can slide back and forth along the guide part and can rotate around the guide part. The main body is also pivotally connected with a seat cushion and a backrest cushion. When the backrest cushion rotates, it can drive the seat cushion to rotate. The backrest cushion also includes a bracket and a pad body installed on the bracket. The pad body can reciprocate relative to the bracket.

[0022] Preferably, a sliding rod and a positioning element are installed on the side of the pad near the bracket, and the positioning element has multiple second locking holes along its length; a mounting seat is provided on the bracket, the sliding rod is installed in the mounting seat and can reciprocate along the mounting seat, thereby changing the position of the pad; the bracket is also provided with a second locking pin, which can be selectively and detachably inserted into any of the second locking holes, so that the pad is in an unlocked state or a locked state.

[0023] Preferably, the bottom of the cushion is provided with a guide part, which includes an arc-shaped guide surface, a positioning groove and a connecting rod. The bottom of the backrest is provided with a lever part, which is provided with a lever that rotates with the backrest. A stop member is also rotatably connected to the body, and a pressure block is provided at one end of the stop member near the guide part.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a guide slide on the connecting arm, the counterweight arm can slide back and forth along the guide slide, and the reverse torque of the counterweight arm can be dynamically adjusted by utilizing the lever principle. When the counterweight arm is away from the rotating connection end of the connecting arm and the main body, the reverse torque is the largest, and it gradually decreases, thereby realizing the continuous switching of different resistance intensities. Users can accurately adjust the training resistance without adding or removing counterweight plates. The locking structure between the counterweight arm and the connecting arm realizes multi-level fixed adjustment. Users only need to rotate the counterweight arm to quickly unlock / lock, which is convenient to operate and highly stable, avoiding accidental slippage during exercise and improving training efficiency. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0028] Figure 3 This is a structural schematic diagram of the counterweight component of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the swing assembly of this utility model;

[0030] Figure 5 This is a schematic diagram of the adjustment mechanism of this utility model;

[0031] Figure 6 This is a schematic diagram of the seated leg flexion and extension state of this utility model;

[0032] Figure 7 This is a schematic diagram of the linkage between the seat cushion and the backrest of this utility model;

[0033] Figure 8 This is a schematic diagram of the prone leg flexion and extension state of this utility model;

[0034] Figure 9 This is a schematic diagram of another embodiment of the counterweight component of this utility model;

[0035] Figure 10 This is a structural schematic diagram of another embodiment of the backrest of this utility model;

[0036] Figure 11 This is a schematic diagram of another embodiment of the backrest of this utility model;

[0037] Figure 12 This is a front view of another embodiment of the present invention;

[0038] Figure 13 This is a rear view of another embodiment of the present invention;

[0039] Figure 14 This is a top view of another embodiment of the present invention;

[0040] Figure 15 This is a bottom view of another embodiment of the present invention;

[0041] Figure 16 This is a left view of another embodiment of the present invention;

[0042] Figure 17 This is a right view of another embodiment of the present invention;

[0043] Figure 18 This is an isometric drawing of another embodiment of the present invention.

[0044] Reference numerals: Body (100); Connecting arm (200); Guide slide rod (201); Snap-fit ​​groove (202); Counterweight arm (210); Snap-fit ​​post (211); First connecting rod (300); First adjusting plate (301); First insertion hole (3011); Second connecting rod (310); First gear lever (311); Second gear lever (312); Swing crossbar (320); Second adjusting plate (321); Second insertion hole (3211); Traction rod (400); Seat cushion (500); Guide part (510); Arc Shaped guide surface (511); positioning groove (512); connecting rod (513); cushion (600); lever part (610); lever (611); first locking pin (612); pad body (620); slide rod (621); positioning part (622); second locking hole (623); bracket (630); mounting base (631); second locking pin (640); stop part (700); pressure block (710); first locking piece (800); first locking hole (810); through groove (900); locking part (910). Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is illustrative in nature and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary rather than limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] like Figures 1 to 8 As shown, a leg flexion and extension integrated machine includes a main body 100 and a swing mechanism. The main body 100 is provided with a counterweight assembly, which is operablely linked with the swing mechanism. The counterweight assembly includes a connecting arm 200 rotatably connected to the main body 100. The connecting arm 200 is provided with a guide portion along its length direction. A counterweight arm 210 is mounted on the guide portion. The counterweight arm 210 can slide back and forth along the guide portion and can rotate relative to the guide portion. The connecting arm 200 is provided with a plurality of first engaging portions. The counterweight arm 210 is provided with a second engaging portion that cooperates with the first engaging portions. The second engaging portion can selectively engage with any of the first engaging portions to restrict the sliding of the counterweight arm 210.

[0049] Please see Figures 1 to 3 As shown, in this embodiment, the counterweight arm 210 generates a reverse torque due to gravity. The reverse torque is changed by adjusting the position of the counterweight arm 210. The reverse torque is greatest when the counterweight arm 210 is far away from the end of the connecting arm 200 that is rotatably connected to the body 100. The reverse torque gradually decreases when the counterweight arm 210 gradually moves closer to the end of the connecting arm 200 that is rotatably connected to the body 100. By dynamically adjusting the reverse torque of the counterweight arm 210 using the lever principle, continuous switching of different resistance intensities can be achieved without adding or removing counterweight plates.

[0050] Please see Figure 3As shown, in this embodiment, multiple first engaging portions are engaging slots 202 spaced apart along the length of the connecting arm 200, and at least two first engaging portions are at different distances from the rotation point of the swing mechanism relative to the body 100. The number of engaging slots 202 is not specifically limited and can be set according to actual needs; in this embodiment, there are three. The second engaging portion is a engaging post 211 disposed on the counterweight arm 210, and the engaging post 211 can be detachably engaged with the engaging slot 202. When the user or automatic mechanism needs to adjust the position of the counterweight arm 210, the engaging post 211 can quickly separate from the engaging slot 202, allowing the counterweight arm 210 to slide along the guide portion. When a new preset position is reached, the engaging post 211 can be inserted back into the corresponding engaging slot 202 for engagement, thereby locking the counterweight arm 210. Please refer to [link to relevant documentation]. Figures 1 to 3 As shown, in this embodiment, the guide part is a guide slide rod 201, which is fixedly connected to the connecting arm 200. The counterweight arm 210 is slidably connected to the guide slide rod 201, allowing the counterweight arm 210 to reciprocate along the guide slide rod 201. To facilitate the disengagement of the locking pin 211 from the locking groove 202, the counterweight arm 210 can also rotate relative to the guide slide rod 201 within a certain range around its axial direction. The counterweight arm 210 has a first rotation direction and a second rotation direction, which are opposite to each other. The first rotation direction is the direction in which the counterweight arm 210 rotates. The counterweight arm 210 rotates upwards, and the second rotation direction is downwards. When the counterweight arm 210 rotates relative to the guide slide rod 201 in the first rotation direction, the locking pin 211 disengages from the locking groove 202, and the counterweight arm 210 can slide back and forth along the length of the guide slide rod 201, thereby adjusting the reverse torque of the counterweight arm 210. When the counterweight arm 210 rotates relative to the guide slide rod 201 in the second rotation direction, the locking pin 211 approaches the locking groove 202, and the locking pin 211 inserts into the corresponding locking groove 202, forming a locking again and fixing it to the required position, thereby restricting the sliding of the counterweight arm 210.

[0051] Please see Figure 9As shown, in another embodiment of this utility model, the first snap-fit ​​part is a through groove 900 provided along the length direction of the connecting arm 200, and the second snap-fit ​​part includes a snap-fit ​​post 211 and a locking member 910. One end of the snap-fit ​​post 211 is connected to the counterweight arm 210, and the other end passes through the through groove 900. The snap-fit ​​post 211 can slide back and forth in the through groove 900 and can provide guidance for the counterweight arm 210 to make its sliding smoother. The locking member 910 is movably sleeved on the end of the snap-fit ​​post 211 away from the counterweight arm 210. The locking member 910 can be rotatably connected to the snap-fit ​​post 211 by means of threaded connection or snap-fit, etc., to lock. The locking element 910 rotates to engage or disengage with the inner wall of the through groove 900 on the side away from the counterweight arm 210. When the locking pin 211 slides along the length of the through groove 900 to a predetermined position, rotating the locking element 910 causes it to fit tightly against the inner wall of the through groove 900 on the side away from the counterweight arm 210, preventing the counterweight arm 210 from sliding and thus achieving a stable lock on the counterweight arm 210. Conversely, when it is necessary to adjust or reset the position of the counterweight arm, simply rotate the locking element 910 in the opposite direction to disengage it from the inner wall of the through groove 900, thereby releasing the locking state of the locking pin 211. At this time, the locking pin 211 can slide freely within the through groove 900, making it easy for the user to adjust it to a new predetermined position. Then, rotating the locking element 910 again allows it to fit tightly against the inner wall of the through groove 900 on the side away from the counterweight arm 210 to relock it.

[0052] In other embodiments (not shown in the figures), the connection between the guide and the counterweight arm 210 can also be designed as a groove structure, a gear structure, or a screw structure, etc. When a groove structure is used, the guide is set as a groove, and the counterweight arm 210 is installed in the groove, which can also achieve a sliding connection. When a gear structure is used, the guide is set as a spur rack, a gear is set on the counterweight arm 210, and the snap-fit ​​structure is eliminated. The position of the counterweight arm 210 is adjusted by rotating the gear. When a screw structure is used, the guide is set as a screw, a screw nut is set on the counterweight arm 210, and the position of the counterweight arm 210 is adjusted by rotating the screw.

[0053] Please see Figures 1 to 3As shown, in this embodiment, when the position of the counterweight arm 210 needs to be adjusted, the user only needs to rotate the counterweight arm 210 upwards, causing the locking pin 211 to disengage from the current locking slot 202. At this time, the locking state of the counterweight arm 210 is released. With the locking pin 211 disengaged from the locking slot 202, the counterweight arm 210 can freely slide back and forth along the guide slide rod 201, thereby changing the magnitude of the counterweight arm 210's reverse torque. The user can push or pull the counterweight arm 210 to slide it to the desired position. When the counterweight arm 210 slides to the new target position, the user only needs to put down the counterweight arm 210. Under the action of gravity, the counterweight arm 210 will automatically fall, causing the locking pin 211 to re-engage into the corresponding locking slot 202. At this time, the counterweight arm 210 is re-locked to restrict sliding and fixed in the new position.

[0054] Please see Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment, the swing mechanism includes a swing crossbar 320, a first connecting rod 300, and a second connecting rod 310. One end of the first connecting rod 300 and the second connecting rod 310 are rotatably connected and pivotally connected to the body 100. The other end of the second connecting rod 310 is rotatably connected to the swing crossbar 320. Through the cooperation of multiple connecting rods and pivot points, the linkage of leg flexion and extension movements during training is realized. A first adjustment mechanism is provided between the first connecting rod 300 and the second connecting rod 310, and the angle between the first connecting rod 300 and the second connecting rod 310 is adjusted by the first adjustment mechanism. A second adjustment mechanism is provided between the swing crossbar 320 and the second connecting rod 310, and the angle between the swing crossbar 320 and the second connecting rod 310 is adjusted by the second adjustment mechanism. Users can adjust the angle between the first connecting rod 300 and the second connecting rod 310, as well as the angle between the swing crossbar 320 and the second connecting rod 310, according to training needs, to achieve the angle settings required for different movements and to meet the personalized training needs of users with different body types.

[0055] Please see Figure 4 and Figure 5As shown, in this embodiment, the first adjustment structure includes a first adjustment disk 301 disposed on the first connecting rod 300 and a first stop lever 311 disposed on the second connecting rod 310. The first adjustment disk 301 has a plurality of first insertion holes 3011, which are evenly distributed circumferentially along the first adjustment disk 301. The first stop lever 311 and the first insertion holes 3011 are detachably inserted to adjust the angle between the first connecting rod 300 and the second connecting rod 310. The second adjustment mechanism includes a second adjustment disk 321 disposed on the swing crossbar 320 and a second stop lever 312 disposed on the second connecting rod 310. The second adjustment disc 321 has multiple second insertion holes 3211, which are evenly distributed around the circumference of the second adjustment disc 321. The second gear lever 312 and the second insertion holes 3211 can be detachably inserted. By selecting different positions of the second insertion holes 3211, the angle between the swing crossbar 320 and the second connecting rod 310 can be adjusted. Through the flexible adjustment of the insertion structure, the user can quickly adjust the angle according to different training movements and needs to adapt to different training requirements. There is no specific limit to the number of the first insertion holes 3011 and the second insertion holes 3211. They can be designed according to actual needs. In this embodiment, there are 7 of them.

[0056] Please see Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment, the first gear lever 311 can be inserted into any of the first insertion holes 3011 to restrict the rotation of the first connecting rod 300 relative to the second connecting rod 310; the second gear lever 312 can be inserted into any of the second insertion holes 3211 to restrict the rotation of the swing crossbar 320 relative to the second connecting rod 310. By restricting their relative rotation, a fixed angle is ensured and a linkage is formed; at this time, the first connecting rod 300, the second connecting rod 310 and the swing crossbar 320 form a linkage mechanism. When the user lifts the swing crossbar 320 upward, the second connecting rod 310 drives the first connecting rod 300 to rotate around the pivot. The point swings upward relative to the main body 100; a traction rod 400 is also provided between the connecting arm 200 and the first link 300. One end of the traction rod 400 is rotatably connected to the connecting arm 200, and the other end is rotatably connected to the first link 300. The traction rod 400 drives the connecting arm 200 to rotate upward relative to the main body 100. The user needs to overcome the reverse torque generated by the counterweight arm 210 due to gravity to complete the action; when the user completes the action and relaxes, the counterweight arm 210 drives the connecting arm 200 to fall under the action of gravity, and the traction arm will drive the swing mechanism to return to its original position, thus completing the automatic reset after the training action.

[0057] Please refer to 6 to Figure 8As shown, in this embodiment, a seat cushion 500 and a backrest cushion 600 are pivotally connected to the main body 100, allowing users to easily adjust their sitting or lying posture and providing a more comfortable training experience. The bottom of the seat cushion 500 is provided with a guide portion 510, which includes an arc-shaped guide surface 511, a positioning groove 512, and a connecting rod 513. The bottom of the backrest cushion 600 is provided with a lever portion 610, which has a lever 611 that rotates with the backrest cushion 600. A stop member 700 is also rotatably connected to the main body 100. The end of the stop member 700 near the guide portion is provided with a pressure block 710. A return spring is also connected between the stop member 700 and the main body 100. One end of the return spring is connected to the main body 100, and the other end is connected to the end of the stop member 700 near the pressure block 710.

[0058] Please see Figure 7 and Figure 8 As shown, in this embodiment, a first locking pin 612 is provided at the end of the lever 610 away from the lever 611, and a first locking piece 800 is provided on the body 100. The first locking piece 800 has first locking holes 810 at both ends. The first locking pin 612 can be detachably inserted into one of the first locking holes 810 to switch the angle of the backrest 600. When the backrest 600 is rotated to the side away from the seat point, the lever 611 rotates upward and abuts against the arc-shaped guide surface 511, slides along the arc-shaped guide surface 511 and enters the positioning groove 512. This process will push the seat cushion 500 to rotate. When the lever 611 rotates downward, the lever 611 disengages from the positioning groove 512 and abuts against the stop member 700, and drives the stop member 700 to rotate, and makes the pressure block 710 approach the connecting rod 513. The seat cushion 500 returns to its original position under the action of gravity, and the pressure block 710 abuts against the connecting rod to restrict the rotation of the seat cushion 500.

[0059] Please see Figure 10 and Figure 11As shown, in this embodiment, the backrest 600 includes a cushion 620 and a support 630. A slide rod 621 and a positioning element 622 are mounted on the side of the cushion 620 near the support 630. The positioning element 622 has multiple second locking holes 523 along its length. A mounting base 631 is provided on the support 630. The slide rod 621 is sleeved within the mounting base 631 and can reciprocate within the mounting base 631, causing the cushion 620 to move relative to the support 630, thereby changing the position of the cushion 620. A second locking pin 640 is also provided on one side of the support 630. The second locking pin 640 can selectively engage with any of the second locking holes 623. The separate plug-in design restricts the movement of the pad 620. When the user needs to adjust the position of the pad 620, they only need to pull the second locking pin 640 out of the second locking hole 623. At this time, the pad 620 is in the unlocked state. When the pad 620 moves to the desired position, the second locking pin 640 is inserted into the corresponding second locking hole 623 to securely lock the pad 620, thereby preventing accidental slippage during training. Users can quickly adjust the position of the pad 620 in the seated leg extension mode according to their height, body type and training experience to optimize the leg force angle and improve the user's training comfort and exercise effect.

[0060] Please see Figures 6 to 8As shown, in this embodiment, the leg extension machine has two training modes: seated leg extension and prone leg extension. When the leg extension machine is in the seated leg extension state, the backrest 600 is inserted into the first locking hole 810 at the upper end of the first locking plate 800 through the first locking pin 612, thereby restricting the rotation of the backrest 600 and preventing instability caused by the movement of the backrest 600 during training. At this time, the lever 611 abuts against the stop 700, the return spring is stretched, and the pressure block 710 presses tightly against the connecting rod 513, which can effectively prevent unnecessary rotation of the seat 500 during use, ensuring that the seat 500 always maintains the predetermined angle during training and ensuring the safety of the user. When it is necessary to switch to the prone leg extension state, first pull the first locking pin 612 out of the first locking hole 810 to unlock the backrest 600. At this time, the backrest 600 can rotate. When the lever 600 rotates away from the seat cushion 500, the lever 611 gradually approaches and abuts against the arc-shaped guide surface 511, and slides along the arc-shaped guide surface 511 until it enters the positioning groove 512. During this process, under the action of the return spring, the pressure block 710 gradually moves away from the connecting rod 513, so that when the lever 611 slides along the arc-shaped guide surface 511, it can drive the seat cushion 500 to gradually rotate upward, adjusting the angle of the seat cushion 500. After the lever 611 is engaged in the positioning groove 512, the first locking pin 612 is inserted into the first locking hole 810 near the lower end of the first locking piece 800, restricting the rotation of the backrest 600 and ensuring that the backrest 600 remains stable during prone training. In addition, after the lever 611 is engaged in the positioning groove 512, due to its restriction on the rotation of the seat cushion 500, the angle of the entire seat cushion 500 is also fixed at the preset position, thus keeping it in a stable state during training.

[0061] In summary, as can be seen from the above description, this utility model achieves the following technical effects: By setting a guide slide 201 on the connecting arm 200, the counterweight arm 210 can slide back and forth along the guide slide 201. The reverse torque of the counterweight arm 210 is dynamically adjusted using the lever principle. When the counterweight arm 210 moves away from the connecting arm 200 and the rotating connection end of the body 100, the reverse torque is at its maximum, and it gradually decreases when it moves away from the connecting arm 200. This allows for continuous switching of different resistance intensities, and users can accurately adjust the training resistance without adding or removing counterweight plates. The locking structure between the counterweight arm 210 and the connecting arm 200 enables multi-position fixed adjustment. Users only need to rotate the counterweight arm 210 to quickly unlock / lock, making the operation convenient and highly stable, avoiding accidental slippage during exercise, and improving training efficiency.

[0062] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0065] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leg flexion and extension integrated machine, comprising a main body (100) and a swing mechanism, characterized in that: The main body (100) is provided with a counterweight assembly, which is operablely linked with the swing mechanism; The counterweight assembly includes a connecting arm (200) rotatably connected to the body (100). The connecting arm (200) has a guide portion along its length direction. A counterweight arm (210) is mounted on the guide portion. The counterweight arm (210) can slide back and forth along the guide portion and can rotate around the guide portion. The connecting arm (200) is provided with a plurality of first locking parts, and the counterweight arm (210) is provided with a second locking part that cooperates with the first locking parts. The second locking part can selectively engage with any of the first locking parts to restrict the sliding of the counterweight arm (210).

2. The leg flexion and extension integrated machine according to claim 1, characterized in that: The first snap-fit ​​portion is a snap-fit ​​groove (202) arranged along the length direction of the connecting arm (200), and the second snap-fit ​​portion is a snap-fit ​​post (211) arranged on the counterweight arm (210), and the snap-fit ​​post (211) and the snap-fit ​​groove (202) can be snapped together separately.

3. The leg flexion and extension integrated machine according to claim 2, characterized in that: The guide part is a guide slide rod (201), and the counterweight arm (210) is slidably connected to the guide slide rod (201).

4. The leg flexion and extension integrated machine according to claim 3, characterized in that: The counterweight arm (210) has a first rotation direction and a second rotation direction. When the counterweight arm (210) rotates relative to the guide slide rod (201) in the first rotation direction, the locking post (211) disengages from the locking groove (202), and the counterweight arm (210) can slide back and forth along the length direction of the guide slide rod (201). When the counterweight arm (210) rotates relative to the guide slide (201) in the second rotation direction, the locking post (211) approaches the locking groove (202) and engages with one of the locking grooves (202), restricting the counterweight arm (210) from sliding along the length direction of the guide slide (201); Wherein, the first rotation direction and the second rotation direction are opposite to each other.

5. The leg flexion and extension integrated machine according to claim 1, characterized in that: The swing mechanism includes a swing crossbar (320), a first connecting rod (300), and a second connecting rod (310). The first connecting rod (300) is rotatably connected to one end of the second connecting rod (310) and pivotally connected to the body (100). The other end of the second connecting rod (310) is rotatably connected to the swing crossbar (320).

6. The leg flexion and extension integrated machine according to claim 5, characterized in that: A first adjustment mechanism is provided between the first link (300) and the second link (310) for adjusting the included angle between the first link (300) and the second link (310); and / or A second adjustment mechanism is provided between the swing crossbar (320) and the second connecting rod (310) for adjusting the angle between the swing crossbar (320) and the second connecting rod (310).

7. The leg flexion and extension integrated machine according to claim 5, characterized in that: A traction rod (400) is also provided between the connecting arm (200) and the first connecting rod (300). One end of the traction rod (400) is rotatably connected to the connecting arm (200), and the other end is rotatably connected to the first connecting rod (300).

8. A leg flexion and extension integrated machine, comprising a body (100) and a swing mechanism, characterized in that: The main body (100) is provided with a counterweight assembly, which is operablely linked with the swing mechanism; The counterweight assembly includes a connecting arm (200) rotatably connected to the body (100). The connecting arm (200) has a guide portion along its length direction. A counterweight arm (210) is mounted on the guide portion. The counterweight arm (210) can slide back and forth along the guide portion and can rotate around the guide portion. The main body (100) is also pivotally connected to a seat cushion (500) and a backrest cushion (600). When the backrest cushion (600) rotates, it can drive the seat cushion (500) to rotate. The cushion (600) also includes a support (630) and a pad (620) mounted on the support (630), the pad (620) being reciprocating relative to the support (630).

9. The leg flexion and extension integrated machine according to claim 8, characterized in that: The pad (620) is equipped with a slide rod (621) and a positioning member (622) on the side near the bracket (630). The positioning member (622) has a plurality of second locking holes (623) along its length. The bracket (630) is provided with a mounting base (631), and the slide rod (621) is installed in the mounting base (631) and can reciprocate along the mounting base (631) to change the position of the pad (620); The bracket (630) is also provided with a second locking pin (640), which can be selectively and detachably inserted into any of the second locking holes (623) to put the pad (620) in an unlocked or locked state.

10. The leg flexion and extension integrated machine according to claim 8, characterized in that: The bottom of the cushion (500) is provided with a guide part (510), the guide part (510) includes an arc-shaped guide surface (511), a positioning groove (512) and a connecting rod (513). The bottom of the backrest (600) is provided with a lever part (610), the lever part (610) is provided with a lever (611), the lever (611) rotates with the backrest (600), and a stop member (700) is rotatably connected to the body (100), the end of the stop member (700) near the guide part is provided with a pressure block (710).

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