Frame-type leg lifting machine with steady pedaling and swinging

Abstract

A frame-type leg lifting machine includes a main frame unit for mounting two driving leg swing arm assemblies, two pedals, a swinging assembly, a magnetic resistance mechanism, and a speed ratio adjustment mechanism. The speed ratio adjustment mechanism is linked between the swinging assembly and the magnetic resistance mechanism. Each of the driving leg swing arm assemblies includes a main leg swing arm and an auxiliary leg swing arm. Upper ends of the main leg swing arm and the auxiliary leg swing arm are pivotally mounted on the main frame unit to serve as pivoting fulcrums, so that the driving leg swing arm assemblies swing within the main frame unit. Each of the pedals has a front section and a rear section pivotally connected with lower ends of the auxiliary leg swing arm and the main leg swing arm.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] The present invention is a continuation-in-part (C.I.P.) application of the co-pending U.S. Ser. No. 18 / 626,446.BACKGROUND OF THE INVENTIONField of the Invention

[0002] The present invention relates to an exercising machine and, more particularly, to a frame-type leg lifting (or raise or extension) machine with steady pedaling and swinging.Description of the Related Art

[0003] A conventional frame-type leg lift machine was disclosed in the U.S. Patent Publication No. 2025 / 0312639, and comprises a main frame unit at least provided with two driving leg swing arms, two handlebar swing arms, a swinging assembly, and a magnetic resistance mechanism. Each of the driving leg swing arms is separately disposed on two sides of the main frame unit, and has a lower end pivotally connected to one of two pedals and an upper end pivotally connected to each of the handlebar swing arms via a transverse driven rod. The upper ends of the two driving leg swing arms are simultaneously linked downward to pivotally connect to the swinging assembly. The swinging assembly links the magnetic resistance mechanism, and the magnetic resistance mechanism simultaneously feeds resistance back inversely in sequence to the two driving leg swing arms and the two handlebar swing arms. Thus, an exerciser can perform a movement of interactive leg lifting swinging with forward and backward limited positions in an arcuate trajectory, and obtain practical effects of magnetic resistance, stable actuation swinging, and improved safety.

[0004] However, the conventional frame-type leg lift machine has the following disadvantages:

[0005] 1. Each of the driving leg swing arms is mounted on the middle section of each of the two pedals, so that when a user steps onto the pedals with their feet, each of the pedals is very prone to tilting or wobbling back and forth, and the user's feet easily slip forward or backward off the pedals and cause ankle sprains, resulting in danger during use.

[0006] 2. When the user's feet step safely onto the pedals and perform interactive leg lifting swinging, at this time, with the forward and backward swinging of the driving leg swing arms and the user's corresponding stepping on the pedals, each of the pedals is even more prone to tilting or wobbling back and forth, and the user's feet are more likely to slip forward or backward off the pedal, causing the whole person to fall off the leg lift machine and sustain injury, or even possibly causing the head to hit various components on the leg lift machine, resulting in greater and unimaginable danger during use.BRIEF SUMMARY OF THE INVENTION

[0007] In view of the lack of safety in the foot pedaling swinging design of the conventional frame-type leg lifting machine, the pedals are very prone to tilting or wobbling back and forth, and the user's feet easily slip forward or backward off the pedals, causing ankle sprains, or the whole person will fall off the leg lifting machine and sustain injury, or even possibly causing the head to suffer an impact.

[0008] The primary objective of the present invention is to provide a frame-type leg lifting machine with steady pedaling and swinging, wherein two stable and sturdy leg swing arm assemblies cooperate with two pedals and a speed ratio adjustment mechanism, allowing a user to pedal safely and stably and perform interactive leg lifting fitness exercises.

[0009] In accordance with the present invention, there is provided a leg lifting machine comprising a main frame unit, two driving leg swing arm assemblies, two pedals, a swinging assembly, a magnetic resistance mechanism, and a speed ratio adjustment mechanism. The main frame unit includes a lower base frame, two side supporting frames, two front upright frames, and two rear upright frames. The two front upright frames and the two rear upright frames are respectively connected between two sides of the lower base frame and front and rear sections each of the two side supporting frames. A front fixing frame is transversely connected to a front section of the lower base frame. A rear fixing frame is transversely connected to a rear section of the lower base frame. A first pivot frame and a second pivot frame are longitudinally connected between a front end of the lower base frame and the front fixing frame. The first pivot frame and the second pivot frame are spaced from each other. Each of the two driving leg swing arm assemblies includes a main leg swing arm and an auxiliary leg swing arm. Upper ends of the main leg swing arm and the auxiliary leg swing arm are respectively and pivotally mounted on each of the two rear upright frames and each of the two side supporting frames to serve as pivoting fulcrums, and swing in alternating forward and backward arcuate trajectories within the main frame unit. A pivotal connection portion extends from the upper end of the main leg swing arm. The pivotal connection portion is pivotally connected downward to an upper end of a first driven member. The first driven member has a lower end pivotally connected to a first end of a rear swing member. The rear swing member is pivotally mounted on each of the two rear upright frames. Each of the two pedals has a front section pivotally connected with a lower end of the auxiliary leg swing arm and a rear section pivotally connected with a lower end of the main leg swing arm. The swinging assembly at least includes a transverse swing base, two linking members, two bottom rods, two front swing members, and a rotating spindle. The transverse swing base is swingably and pivotally mounted on the rear fixing frame. The transverse swing base has two ends respectively and pivotally connected to a first end of each of the two linking members. Each of the two linking members has a second end pivotally connected to the rear swing member. Each of the two bottom rods has a rear end respectively and pivotally connected to a second end of the rear swing member. Each of the two bottom rods has a front end pivotally connected to a first end of one of the two front swing members. Each of the two front swing members has a second end axially and pivotally dispose the rotating spindle. The magnetic resistance mechanism is assembled at the front section of the lower base frame and provides resistance to the swinging assembly. The magnetic resistance mechanism at least includes a rotatable magnetic resistance wheel. The magnetic resistance wheel has an axis provided with a pivot wheel. The speed ratio adjustment mechanism is assembled at the front section of the lower base frame and linked between the swinging assembly and the magnetic resistance mechanism, to adjust a ratio of resistance rotational speed. The speed ratio adjustment mechanism includes a first transmission module, a second transmission module, and a third transmission belt. The first transmission module includes a rotatable first pulley and a first transmission belt. The first pulley has an axis provided with a first pivot wheel. The first pulley and the first pivot wheel are respectively and pivotally mounted on two different sides of the first pivot frame. The second transmission module includes a rotatable second pulley and a second transmission belt. The second pulley has an axis provided with a second pivot wheel. The second pulley and the second pivot wheel are respectively and pivotally mounted on two different sides of the second pivot frame. The first transmission belt is commonly wound around the pivot wheel of the magnetic resistance wheel and the first pulley. The second transmission belt is commonly wound around the first pivot wheel and the second pulley. The third transmission belt is commonly wound around the second pivot wheel and one end of the rotating spindle.

[0010] According to the primary advantages of the present invention, the auxiliary leg swing arm and the main leg swing arm are respectively and pivotally mounted at the front section position and the rear section position of each of the two pedals, so that when an exerciser uses the machine and steps onto the two pedals with both feet to perform interactive leg lifting swinging, the two pedals will not produce tilting or wobbling back and forth. Thus, the user's feet can step firmly and safely on the two pedals without slipping off the two pedals and causing ankle sprains, or causing the whole person to fall off the leg lifting machine and sustain injury, or even causing the head to hit various components on the leg lifting machine, thereby providing the exerciser with high safety during use.

[0011] Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

[0012] FIG. 1 is a perspective view of a leg lifting machine in accordance with a first preferred embodiment of the present invention.

[0013] FIG. 2 is a partial exploded perspective view of the leg lifting machine in accordance with the first preferred embodiment of the present invention.

[0014] FIG. 3 is a bottom perspective view of the leg lifting machine in accordance with the first preferred embodiment of the present invention.

[0015] FIG. 4 is another partial exploded perspective view of the leg lifting machine in accordance with the preferred embodiment of the present invention.

[0016] FIG. 5 is another partial exploded perspective view of the leg lifting machine in accordance with the preferred embodiment of the present invention.

[0017] FIG. 6 is a partial perspective view of the leg lifting machine in accordance with the first preferred embodiment of the present invention.

[0018] FIG. 7 is a partial exploded perspective view of the leg lifting machine as shown in FIG. 6.

[0019] FIG. 8 is a schematic side operational view of the leg lifting machine in accordance with the first preferred embodiment of the present invention.

[0020] FIG. 9 is a perspective view of a leg lifting machine in accordance with a second preferred embodiment of the present invention.

[0021] FIG. 10 is a partial exploded perspective view of the leg lifting machine in accordance with the second preferred embodiment of the present invention.

[0022] FIG. 11 is a partial perspective view of the leg lifting machine in accordance with the second preferred embodiment of the present invention.

[0023] FIG. 12 is another partial exploded perspective view of the leg lifting machine in accordance with the second preferred embodiment of the present invention.

[0024] FIG. 13 is a locally enlarged perspective view showing a magnetic resistance mechanism of the leg lifting machine in accordance with the present invention.

[0025] FIG. 14 is another locally enlarged perspective view showing a magnetic resistance mechanism of the leg lifting machine in accordance with the present invention.

[0026] FIG. 15 is a partial perspective view of a leg lifting machine in accordance with a third preferred embodiment of the present invention.DETAILED DESCRIPTION OF THE INVENTION

[0027] Referring to the drawings and initially to FIGS. 1-8, 13, and 14, a frame-type leg lifting machine with steady pedaling and swinging in accordance with the preferred embodiment of the present invention comprises a main frame unit 10, two driving leg swing arm assemblies 20, two pedals 30, a swinging assembly (or mechanism) 50, a magnetic (or magnetically controlled) resistance mechanism 70, and a speed ratio adjustment mechanism 60.

[0028] The main frame unit 10 includes a lower base frame (or bottom frame) 11, two side supporting frames (or side brackets) 12, two front upright frames 13, and two rear upright frames 14. The two front upright frames 13 and the two rear upright frames 14 are respectively connected between two sides of the lower base frame 11 and front and rear sections each of the two side supporting frames 12. A front fixing frame (or support strut) 112 is transversely connected to a front section of the lower base frame 11. A rear fixing frame (or support strut) 111 is transversely connected to a rear section of the lower base frame 11. A first pivot frame 115 and a second pivot frame 116 are longitudinally connected between a front end of the lower base frame 11 and the front fixing frame 112. The first pivot frame 115 and the second pivot frame 116 are spaced from each other.

[0029] Each of the two driving leg swing arm assemblies 20 includes a main leg swing arm (or main drive lever) 21 and an auxiliary leg swing arm (or auxiliary drive lever) 22. Upper ends of the main leg swing arm 21 and the auxiliary leg swing arm 22 are respectively and pivotally mounted on each of the two rear upright frames 14 and each of the two side supporting frames 12 to serve as pivoting fulcrums, and swing in alternating forward and backward arcuate trajectories within the main frame unit 10. Thus, the two driving leg swing arm assemblies 20 are pivoted relative to the main frame unit 10 to reciprocally (or alternatingly) swing forward and backward, and to move along a curved trajectory (or track).

[0030] A pivotal connection portion 211 extends from the upper end of the main leg swing arm 21. The pivotal connection portion 211 is pivotally connected downward to an upper end of a first driven member 42. The first driven member 42 has a lower end pivotally connected to a first end of a rear swing member 43. The rear swing member 43 is pivotally mounted on each of the two rear upright frames 14.

[0031] Each of the two pedals 30 has a front section pivotally connected with a lower end of the auxiliary leg swing arm 22 and a rear section pivotally connected with a lower end of the main leg swing arm 21.

[0032] The swinging assembly 50 at least includes a transverse swing base 51, two linking members 52, two bottom rods (or levers) 53, two front swing members 54, and a rotating spindle (or rotation shaft) 55.

[0033] The transverse swing base 51 is swingably and pivotally mounted on the rear fixing frame 111. The transverse swing base 51 has two ends respectively and pivotally connected to a first end of each of the two linking members 52. Each of the two linking members 52 has a second end pivotally connected to the rear swing member 43. Each of the two bottom rods 53 has a rear end respectively and pivotally connected to a second end of the rear swing member 43. Each of the two bottom rods 53 has a front end pivotally connected to a first end of one of the two front swing members 54. Each of the two front swing members 54 has a second end axially and pivotally dispose the rotating spindle 55.

[0034] The magnetic resistance mechanism 70 is assembled at the front section of the lower base frame 11 and provides resistance to the swinging assembly 50. The magnetic resistance mechanism 70 at least includes a rotatable magnetic resistance wheel 72. The magnetic resistance wheel 72 has an axis provided with a pivot (or rotation) wheel 721.

[0035] The speed ratio adjustment mechanism 60 is assembled at the front section of the lower base frame 11 and linked between the swinging assembly 50 and the magnetic resistance mechanism 70, to adjust a ratio of resistance rotational speed. The speed ratio adjustment mechanism 60 includes a first transmission module 61, a second transmission module 62, and a third transmission belt 63.

[0036] The first transmission module 61 includes a rotatable first pulley (or belt wheel) 611 and a first transmission belt 612. The first pulley 611 has an axis provided with a first pivot wheel 613. The first pulley 611 and the first pivot wheel 613 are respectively and pivotally mounted on two different sides of the first pivot frame 115.

[0037] The second transmission module 62 includes a rotatable second pulley (or belt wheel) 621 and a second transmission belt 622. The second pulley 621 has an axis provided with a second pivot wheel 623. The second pulley 621 and the second pivot wheel 623 are respectively and pivotally mounted on two different sides of the second pivot frame 116.

[0038] The first transmission belt 612 is commonly wound (or looped) around the pivot wheel 721 of the magnetic resistance wheel 72 and the first pulley 611. The second transmission belt 622 is commonly wound (or looped) around the first pivot wheel 613 and the second pulley 621. The third transmission belt 63 is commonly wound (or looped) around the second pivot wheel 623 and one end of the rotating spindle 55.

[0039] In the preferred embodiment of the present invention, the main frame unit 10 further includes a front bracket (or support) 15 connected between the front sections of the two side supporting frames 12, a placement rack 16 mounted on the front bracket 15, and two handlebar frames (or hand grips) 17 mounted on the two side supporting frames 12 respectively.

[0040] In the preferred embodiment of the present invention, the upper end of the first driven member 42 is pivotally connected to a first pivotal connection member 44, and the lower end of the first driven member 42 is pivotally connected to a second pivotal connection member 45. The first pivotal connection member 44 is pivotally connected to the pivotal connection portion 211 of the main leg swing arm 21. The second pivotal connection member 45 is pivotally connected to the first end of the rear swing member 43.

[0041] In the preferred embodiment of the present invention, the first driven member 42 is a lever or rod or link as shown in FIG. 6.

[0042] In the preferred embodiment of the present invention, the front fixing frame 112 is provided with two pivot ears 113 that are parallel with each other. The two pivot ears 113 and the two front swing members 54 axially and pivotally dispose the rotating spindle 55. In assembly, the rotating spindle 55 is pivotally (or rotatably) mounted on the two pivot ears 113, and the two front swing members 54 are mounted (or secured) on the rotating spindle 55. Thus, when the two front swing members 54 are moved, the rotating spindle 55 is driven and rotated. Preferably, a one-way (or unidirectional or single direction) bearing is mounted between each of the two front swinging members 54 and the rotation mandrel 55 so that when the two front swinging members 54 are pivoted respectively, the rotation mandrel 55 is rotated in one way.

[0043] In the preferred embodiment of the present invention, the main frame unit 10 further includes a front cover plate 18 covering the magnetic resistance mechanism 70, a rear cover plate 19 covering the swinging assembly 50, and two second covering members 141 respectively covering the two rear upright frames 14. The front cover plate 18 and the rear cover plate 19 are mounted on the lower base frame 11. The two second covering members 141 are also used to cover the pivotal connection portion 211, the first pivotal connection member 44, the first driven member 42, and the second pivotal connection member 45.

[0044] In the preferred embodiment of the present invention, the frame-type leg lifting machine further comprises a swingable lifting frame 80 pivotally connected to a bottom of the lower base frame 11, and a lifting mechanism 90 connected between the lower base frame 11 and the lifting frame 80. In practice, the lifting mechanism 90 links and drives the lifting frame 80 to swing, thereby causing the lower base frame 11 to change different inclination angles.

[0045] Operation of the first preferred embodiment of the present invention is described as follows.

[0046] 1. When in use, the exerciser's two feet step on the two pedals 30, so that the two pedals 30 alternately drive and move the two driving leg swing arm assemblies 20, so that the two driving leg swing arm assemblies 20 are driven to swing along an arcuate trajectory in an alternating forward and backward limited manner. Therefore, the user can raise and extend two legs to achieve an exercising effect.

[0047] 2. When the two driving leg swing arm assemblies 20 swing, each of the two driving leg swing arm assemblies 20 sequentially links and drives the first pivotal connection member 44, the first driven member 42, the second pivotal connection member 45, and the rear swing member 43, and synchronously pulls each of the two bottom rods 53 to drive each of the two front swing members 54 to swing, thereby driving and rotating the rotating spindle 55.

[0048] 3. As shown in FIGS. 13 and 14, when the rotating spindle 55 is rotated, transmission is conducted from the third transmission belt 63 via the speed ratio adjustment mechanism 60 to the magnetic resistance wheel 72 of the magnetic resistance mechanism 70 so that the magnetic resistance wheel 72 is rotated. When the magnetic resistance wheel 72 rotates, resistance is simultaneously fed back inversely in sequence to the two driving leg swing arm assemblies 20. Preferably, when the magnetic resistance wheel 72 is rotated relative to a magnetic bracket, the magnetic bracket provides a magnetic resistance to the magnetic resistance wheel 72 and to apply a damping force to the two driving leg swing arm assemblies 20, so that the user has to overcome the damping force to enhance the exercising effect.

[0049] Referring to FIGS. 9-12, according to the second preferred embodiment of the present invention, the frame-type leg lifting machine further comprises two handlebar swing arms 40 mounted on two sides of the lower base frame 11, and two transverse driven rods (or levers) 41 connected with the two handlebar swing arms 40 respectively. Each of the two handlebar swing arms 40 has a lower end pivotally mounted on the lower base frame 11. Each of the two transverse driven rods 41 has a first end pivotally connected to a middle section of one of the two handlebar swing arms 40 and a second end pivotally connected to the pivotal connection portion 211 of the main leg swing arm 21. The main frame unit 10 further includes two first covering members 122 mounted on the two side supporting frames 12 respectively and covering the two transverse driven rods 41 respectively. Each of the two first covering members 122 is longitudinally formed with a slot 121 allowing passage and swinging of each of the two handlebar swing arms 40.

[0050] Operation of the second preferred embodiment of the present invention is described as follows.

[0051] 1. When in use, the exerciser's two feet step on the two pedals 30, so that the two pedals 30 alternately drive and move the two driving leg swing arm assemblies 20, so that the two driving leg swing arm assemblies 20 are driven to swing along an arcuate trajectory in an alternating forward and backward limited manner. At the same time, when the exerciser's two hands hold the handlebar swing arms 40, the two transverse driven rods 41 are driven by the two driving leg swing arm assemblies 20, to move the handlebar swing arms 40, so that the two handlebar swing arms 40 will reciprocally (or alternatingly) swing forward and backward.

[0052] 2. When the two driving leg swing arm assemblies 20 swing, each of the two driving leg swing arm assemblies 20 sequentially links and drives the first pivotal connection member 44, the first driven member 42, the second pivotal connection member 45, and the rear swing member 43, and synchronously pulls each of the two bottom rods 53 to drive each of the two front swing members 54 to swing, thereby driving and rotating the rotating spindle 55.

[0053] 3. As shown in FIGS. 13 and 14, when the rotating spindle 55 is rotated, transmission is conducted from the third transmission belt 63 via the speed ratio adjustment mechanism 60 to the magnetic resistance wheel 72 of the magnetic resistance mechanism 70 so that the magnetic resistance wheel 72 is rotated. When the magnetic resistance wheel 72 rotates, resistance is simultaneously fed back inversely in sequence to the two driving leg swing arm assemblies 20 and the two handlebar swing arms 40.

[0054] Referring to FIG. 15, the first driven member 42 is a cable.

[0055] Accordingly, the frame-type leg lifting machine of the present invention has the following advantages:

[0056] 1. The auxiliary leg swing arm 22 and the main leg swing arm 21 are pivotally mounted at the front section position and the rear section position of each of the two pedals 30. Thus, when the exerciser uses the machine and steps onto the two pedals 30 with both feet, tilting or wobbling back and forth will not occur. In addition, the user's two feet can step firmly and safely on the two pedals 30 without slipping off and causing ankle sprains.

[0057] 2. As shown in FIG. 8, when the user's two feet step on the two pedals 30 to perform alternating leg lifting and swinging actions, the two pedals 30 will always maintain a horizontal state to swing with the two driving leg swing arm assemblies 20, without tilting or wobbling back and forth, so that the user's two feet can step firmly and safely on the two pedals 30, preventing the user from falling off the machine and sustaining injury, or even preventing the user's head from hitting various components on the machine, thereby providing the user with high safety during use.

[0058] 3. The speed ratio adjustment mechanism 60 is installed between the swinging assembly 50 and the magnetic resistance mechanism 70 to adjust a ratio of resistance and rotational speed. Thus, through the combination of different resistances of the magnetic resistance wheel 72 of the magnetic resistance mechanism 70 and the speed ratio adjustment mechanism 60, different training effects are achieved, and the user is allowed to pedal more smoothly, steadily, and comfortably.

[0059] 4. The user can step on the two pedals 30 firmly and safely to perform exercise of alternating leg lifting and swinging, and to achieve different training effects by cooperation of the magnetic resistance mechanism 70 and the speed ratio adjustment mechanism 60.

[0060] Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the scope of the invention.

Claims

1. A leg lifting machine comprising:a main frame unit, two driving leg swing arm assemblies, two pedals, a swinging assembly, a magnetic resistance mechanism, and a speed ratio adjustment mechanism;wherein:the main frame unit includes a lower base frame, two side supporting frames, two front upright frames, and two rear upright frames;the two front upright frames and the two rear upright frames are respectively connected between two sides of the lower base frame and front and rear sections each of the two side supporting frames;a front fixing frame is transversely connected to a front section of the lower base frame;a rear fixing frame is transversely connected to a rear section of the lower base frame;a first pivot frame and a second pivot frame are longitudinally connected between a front end of the lower base frame and the front fixing frame;the first pivot frame and the second pivot frame are spaced from each other;each of the two driving leg swing arm assemblies includes a main leg swing arm and an auxiliary leg swing arm;upper ends of the main leg swing arm and the auxiliary leg swing arm are respectively and pivotally mounted on each of the two rear upright frames and each of the two side supporting frames to serve as pivoting fulcrums, and swing in alternating forward and backward arcuate trajectories within the main frame unit;a pivotal connection portion extends from the upper end of the main leg swing arm;the pivotal connection portion is pivotally connected downward to an upper end of a first driven member;the first driven member has a lower end pivotally connected to a first end of a rear swing member;the rear swing member is pivotally mounted on each of the two rear upright frames;each of the two pedals has a front section pivotally connected with a lower end of the auxiliary leg swing arm and a rear section pivotally connected with a lower end of the main leg swing arm;the swinging assembly at least includes a transverse swing base, two linking members, two bottom rods, two front swing members, and a rotating spindle;the transverse swing base is swingably and pivotally mounted on the rear fixing frame;the transverse swing base has two ends respectively and pivotally connected to a first end of each of the two linking members;each of the two linking members has a second end pivotally connected to the rear swing member;each of the two bottom rods has a rear end respectively and pivotally connected to a second end of the rear swing member;each of the two bottom rods has a front end pivotally connected to a first end of one of the two front swing members;each of the two front swing members has a second end axially and pivotally dispose the rotating spindle;the magnetic resistance mechanism is assembled at the front section of the lower base frame and provides resistance to the swinging assembly;the magnetic resistance mechanism at least includes a rotatable magnetic resistance wheel;the magnetic resistance wheel has an axis provided with a pivot wheel;the speed ratio adjustment mechanism is assembled at the front section of the lower base frame and linked between the swinging assembly and the magnetic resistance mechanism, to adjust a ratio of resistance rotational speed;the speed ratio adjustment mechanism includes a first transmission module, a second transmission module, and a third transmission belt;the first transmission module includes a rotatable first pulley and a first transmission belt;the first pulley has an axis provided with a first pivot wheel;the first pulley and the first pivot wheel are respectively and pivotally mounted on two different sides of the first pivot frame;the second transmission module includes a rotatable second pulley and a second transmission belt;the second pulley has an axis provided with a second pivot wheel;the second pulley and the second pivot wheel are respectively and pivotally mounted on two different sides of the second pivot frame;the first transmission belt is commonly wound around the pivot wheel of the magnetic resistance wheel and the first pulley;the second transmission belt is commonly wound around the first pivot wheel and the second pulley; andthe third transmission belt is commonly wound around the second pivot wheel and one end of the rotating spindle.

2. The leg lifting machine as claimed in claim 1, wherein the main frame unit further includes a front bracket connected between the front sections of the two side supporting frames, a placement rack mounted on the front bracket, and two handlebar frames mounted on the two side supporting frames respectively.

3. The leg lifting machine as claimed in claim 1, further comprising:two handlebar swing arms mounted on two sides of the lower base frame; andtwo transverse driven rods connected with the two handlebar swing arms respectively;wherein:each of the two handlebar swing arms has a lower end pivotally mounted on the lower base frame;each of the two transverse driven rods has a first end pivotally connected to a middle section of one of the two handlebar swing arms and a second end pivotally connected to the pivotal connection portion of the main leg swing arm;the main frame unit further includes two first covering members mounted on the two side supporting frames respectively and covering the two transverse driven rods respectively; andeach of the two first covering members is longitudinally formed with a slot allowing passage and swinging of each of the two handlebar swing arms.

4. The leg lifting machine as claimed in claim 1, wherein:the upper end of the first driven member is pivotally connected to a first pivotal connection member;the lower end of the first driven member is pivotally connected to a second pivotal connection member;the first pivotal connection member is pivotally connected to the pivotal connection portion of the main leg swing arm; andthe second pivotal connection member is pivotally connected to the first end of the rear swing member.

5. The leg lifting machine as claimed in claim 1, wherein the first driven member is a rod.

6. The leg lifting machine as claimed in claim 1, wherein the first driven member is a cable.

7. The leg lifting machine as claimed in claim 1, wherein the front fixing frame is provided with two pivot ears, and the two pivot ears and the two front swing members pivotally dispose the rotating spindle.

8. The leg lifting machine as claimed in claim 1, wherein the main frame unit further includes a front cover plate covering the magnetic resistance mechanism, a rear cover plate covering the swinging assembly, and two second covering members respectively covering the two rear upright frames, and the front cover plate and the rear cover plate are mounted on the lower base frame.

9. The leg lifting machine as claimed in claim 1, further comprising:a swingable lifting frame pivotally connected to a bottom of the lower base frame; anda lifting mechanism connected between the lower base frame and the lifting frame;wherein the lifting mechanism links and drives the lifting frame to swing, thereby causing the lower base frame to change different inclination angles.

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