A force arm adjustment mechanism for fitness equipment and use method thereof

Abstract

The present invention relates to a force arm adjustment mechanism for fitness equipment and a method for using the mechanism. The mechanism comprises a frame, an operating frame hinged on the frame, and a swing frame hinged on the operating frame. The swing frame is equipped with a load, and the operating frame is provided with an operating part. The mechanism also comprises a pull rod, one end of the pull rod is hinged to the swing frame, and the other end of the pull rod is hinged to the frame. By setting the pull rod, when the operating frame rotates, the swing frame rotates a certain angle relative to the operating frame, thereby changing the force arm length of the load relative to the hinge point of the frame and the operating frame; by changing the force arm length of the load, the magnitude of the push-pull force in the push-pull stroke is changed, so that different exercise effects can be achieved for different exercise movements. The mechanism can be applicable to a variety of fitness equipment, has a simple structure, and is very suitable for various professional fitness equipment.

Description

Technical Field

[0001] The invention relates to the technical field of fitness equipment, and in particular to a force arm adjustment mechanism for fitness equipment and a use method thereof. Background Art

[0002] The development of China's fitness equipment industry began in the late 1980s. With China's accession to the WTO and the success of Beijing's bid for the Olympic Games, favorable conditions and development opportunities have been provided for the development of the fitness equipment industry. The continuous expansion of the fitness team has brought strong business opportunities to fitness equipment manufacturers. Currently, the commonly used fitness equipment overcomes the gravity of the load through push or pull force, thereby achieving a corresponding training effect on the force-generating muscle groups. As the push and pull action stroke changes, the push and pull force is usually constant or changes evenly. In order to achieve better and more professional training effects, the load force should be changed according to the change of the push and pull action stroke, so as to adapt to the training force of the muscles in different postures.

[0003] For example, in the chest press movement, at the start of the chest press, the forearm and upper arm are almost vertical. At this time, the hand is farthest from the chest, and pushing is more difficult. At this time, the load force should be minimized to facilitate the start of the chest press. In the later stage of the chest press movement, since the arms are almost straight, the distance between the hands and the chest becomes smaller. At this time, the load force should be increased rapidly to achieve a better exercise effect. If the load force still maintains the starting state or increases less than the starting state at this time, the best exercise effect cannot be achieved. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a force arm adjustment mechanism for fitness equipment and a use method thereof, which can change the magnitude of the thrust according to the use status.

[0005] The present invention is achieved through the following technical scheme, which provides a force arm adjustment mechanism for fitness equipment, including a frame, an operating frame hinged on the frame, and a swing frame hinged on the operating frame, wherein a load is mounted on the swing frame, an operating part is provided on the operating frame, and a pull rod is also included, one end of the pull rod is hinged to the swing frame, and the other end of the pull rod is hinged to the frame.

[0006] The load in this solution is installed on the swing frame, and the operator pushes and pulls the operating part to rotate the operating part, and exercises by overcoming the load force provided by the load; when the operating frame rotates, the hinge point between the swing frame and the operating frame makes a circular motion around the hinge point between the operating frame and the frame, and the hinge point between the pull rod and the swing frame makes a circular motion around the hinge point between the pull rod and the frame, so that the swing frame rotates a certain angle relative to the operating frame, thereby changing the lever arm length of the load relative to the hinge point between the frame and the operating frame; by changing the lever arm length of the load, the size of the push-pull force in the push-pull stroke is changed, so that different exercise effects can be achieved for different exercise movements.

[0007] As an optimization, the projection of the hinge of the operating frame and the frame on the operating frame movement plane is point A, the projection of the hinge of the operating frame and the swing frame on the operating frame movement plane is point B, the projection of the hinge of the pull rod and the swing frame on the operating frame movement plane is point C, and the projection of the hinge of the pull rod and the frame on the operating frame movement plane is point D. Point A, point B, point C and point D are connected end to end in sequence to form a convex quadrilateral. In this solution, point A, point B, point C and point D are connected end to end in sequence to form a convex quadrilateral. Since the connecting line AD remains unchanged, as the connecting line AB swings toward the connecting line CD, the angle DAB becomes smaller and the angle ABC becomes larger, so that the load swings in the direction away from point A, thereby increasing the load's force arm length, so that the push-pull force can increase with the increase of the push-pull stroke.

[0008] As an optimization, the projection of the hinge of the operating frame and the frame on the operating frame motion plane is point A, the projection of the hinge of the operating frame and the swing frame on the operating frame motion plane is point B, the projection of the hinge of the pull rod and the swing frame on the operating frame motion plane is point C, the projection of the hinge of the pull rod and the frame on the operating frame motion plane is point D, and the connecting line AB and the connecting line CD are arranged crosswise. In this scheme, the connecting line AB and the connecting line CD are arranged crosswise, because the connecting line AD remains unchanged, as the connecting line AB swings toward the direction of point C, the angle DAB becomes larger and the angle ABC becomes smaller, so that the load swings in the direction close to point A, thereby reducing the load's force arm length, so that the push-pull force can be reduced as the push-pull stroke increases.

[0009] As an optimization, the load includes a barbell shaft fixedly connected to the swing frame, and a barbell plate is mounted on the barbell shaft. The load in this solution includes a barbell shaft, and the size of the load can be adjusted by adjusting the barbell plate on the barbell shaft.

[0010] As an optimization, the pull rod is connected to the swing frame through a ball joint, and the pull rod is connected to the frame through a ball joint. In this solution, the pull rod is connected to the swing frame through a ball joint, and the pull rod is connected to the frame through a ball joint, so that the hinge axis of the operating frame and the frame can be arranged crosswise with the hinge axis of the operating frame and the swing frame, so as to facilitate adaptation to various equipment.

[0011] As an optimization, the load is set at one end of the swing frame away from the hinge of the swing frame and the operating frame. In this solution, the load is set at one end of the swing frame away from the hinge of the swing frame and the operating frame, thereby increasing the distance between the load and the hinge, and when the swing frame swings a certain angle, the movement distance of the load lever arm is larger.

[0012] As an optimization, two operating frames are hinged on the frame, and the two operating frames are symmetrically arranged. The two operating frames arranged in this solution correspond to the exercise of both hands or both legs, and can adapt to more equipment.

[0013] A method for using a force arm adjustment mechanism for fitness equipment comprises the following steps:

[0014] a. The load is mounted on the swing frame, and the operator pushes and pulls the operating part to rotate it, exercising by overcoming the load force provided by the load;

[0015] b. When the operating frame rotates, the hinge point between the swing frame and the operating frame moves in a circle around the hinge point between the operating frame and the frame, and the hinge point between the pull rod and the swing frame moves in a circle around the hinge point between the pull rod and the frame, so that the swing frame rotates a certain angle relative to the operating frame, thereby changing the length of the force arm of the load relative to the hinge point between the frame and the operating frame;

[0016] c. By changing the length of the load arm, the magnitude of the push-pull force in the push-pull stroke can be changed, so that different exercise effects can be achieved for different exercise movements.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a force arm adjustment mechanism for fitness equipment and a method of using the same, by setting a pull rod, so that when the operating frame rotates, the swing frame rotates a certain angle relative to the operating frame, thereby changing the force arm length of the load relative to the hinge point between the frame and the operating frame; by changing the force arm length of the load, the magnitude of the push-pull force in the push-pull stroke is changed, so that different exercise effects can be achieved for different exercise movements. The mechanism can be applicable to a variety of fitness equipment, has a simple structure, and is very suitable for various professional fitness equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of another state of Embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of another state of Embodiment 2 of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the embodiment 1 of the present invention applied to a chest press training machine;

[0023] Figure 6 It is a front view of the embodiment 1 of the present invention applied to the chest press training machine;

[0024] Figure 7 It is a side view of the embodiment 1 of the present invention applied to the chest press training machine;

[0025] As shown in the figure:

[0026] 1. Frame, 2. Operating frame, 3. Swing frame, 4. Pull rod, 5. Load, 6. Operating part, 7. Seat, 8. Backrest. DETAILED DESCRIPTION

[0027] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0028] The push and pull forces described in the present invention include but are not limited to various forces during fitness, such as push force, pull force, rotation force, etc.

[0029] Embodiment 1:

[0030] like Figures 1 to 7 As shown, a force arm adjustment mechanism for fitness equipment of the present invention comprises a frame 1, an operating frame 2 hinged on the frame 1, and a swing frame 3 hinged on the operating frame 2. The frame 1 is a fixed frame on the fitness equipment, and the operating frame 2 is vertically arranged and the upper end is hinged to the frame 1.

[0031] Two operating frames 2 are hinged on the frame 1, and the two operating frames 2 are symmetrically arranged on the left and right.

[0032] The swing frame 3 is arranged horizontally, and one end of the swing frame 3 is hinged to the middle position of the operating frame 2. The hinge axis between the swing frame 3 and the operating frame 2 can be parallel to the hinge axis between the operating frame 2 and the frame 1, or there can be a certain angle between them.

[0033] The load 5 is arranged at one end of the swing frame 3 away from the hinged connection between the swing frame 3 and the operating frame 2 .

[0034] The load 5 can be fixed on the swing frame 3 or a pull rope connected to the swing frame 3, and the other end of the pull rope is equipped with a counterweight. The vertical distance from the hinge axis of the operating frame 2 and the frame 1 to the load force is the load arm.

[0035] The load 5 comprises a barbell shaft fixedly connected to the swing frame 3, and a barbell plate is mounted on the barbell shaft.

[0036] The operating frame 2 is provided with an operating portion 6 , which in this embodiment is an operating handle. The operating portion 6 is disposed at the lower end of the operating frame 2 .

[0037] It also includes a pull rod 4, one end of which is hinged to the swing frame 3 through a ball joint, and the other end of the pull rod 4 is hinged to the frame 1 through a ball joint. The pull rod 4 is connected to the end of the swing frame 3 close to the load 5, and a spiral sleeve is installed in the middle of the pull rod 4 to adjust the length of the pull rod 4. Both ends of the pull rod 4 are joint bearings.

[0038] The projection of the hinge between the operating frame 2 and the frame 1 on the movement plane of the operating frame 2 is point A, the projection of the hinge between the operating frame 2 and the swing frame 3 on the movement plane of the operating frame 2 is point B, the projection of the hinge between the pull rod 4 and the swing frame 3 on the movement plane of the operating frame 2 is point C, and the projection of the hinge between the pull rod 4 and the frame 1 on the movement plane of the operating frame 2 is point D. Point A, point B, point C and point D are connected end to end in sequence to form a convex quadrilateral.

[0039] The following is an explanation using a seated chest press training machine equipped with the present lever arm adjustment mechanism as an example.

[0040] like Figures 5 to 7 As shown, the seated chest press training machine includes a lever arm adjustment mechanism, on which two operating frames 2 are mounted, and the two operating frames 2 are symmetrically arranged.

[0041] The frame 1 of the lever arm adjustment mechanism is the frame of the seated chest press training machine. The frame 1 is provided with a seat 7 located between two operating frames 2, and a backrest 8 is provided behind the seat. The operating part 6 here is a transversely arranged operating handle, and the operating handle is covered with a non-slip rubber sleeve. When exercising, the exerciser sits on the seat 7 and leans his back against the backrest.

[0042] like Figure 6 As shown, the swing frame 3, the load 5 and the pull rod 4 are all arranged in front of the operating frame 2, and the load 5 is arranged at the front end of the swing frame 3. During exercise, the operator holds the operating handle with both hands. At this time, the upper arm is parallel to the body, and the forearm is nearly perpendicular to the upper arm and faces forward. At this time, the load force is the smallest, which is convenient for the operator to start.

[0043] When the operator pushes the operating handle to swing the operating frame 2 forward, the operating frame 2 changes from vertical to horizontal, which will increase the force arm of the load. However, the increase in thrust cannot meet the requirement.

[0044] When the operating frame 2 swings forward, the pull rod 4 pushes the swing frame 3, causing the swing frame 3 to rotate relative to the operating frame 2 toward the operating handle, thereby further increasing the load arm length; increasing the degree of thrust increase until the arm is straightened, at which time the arm thrust is maximum.

[0045] A method for using a force arm adjustment mechanism for fitness equipment:

[0046] The load is mounted on the swing frame 3, and the operator pushes and pulls the operating part 6 to rotate the operating part, and exercises by overcoming the load force provided by the load;

[0047] When the operating frame 2 rotates, the hinge point between the swing frame 3 and the operating frame 2 moves in a circle around the hinge point between the operating frame 2 and the frame 1, and the hinge point between the pull rod 4 and the swing frame 3 moves in a circle around the hinge point between the pull rod 4 and the frame 1, so that the swing frame 3 rotates a certain angle relative to the operating frame 2, thereby changing the length of the force arm of the load relative to the hinge point between the frame 1 and the operating frame 2;

[0048] By changing the length of the load arm, the magnitude of the push and pull force of the exerciser can be changed, so that different exercise effects can be achieved for different exercise movements.

[0049] Embodiment 2:

[0050] The difference between this embodiment and embodiment 1 is that:

[0051] The line AB and the line CD are set to cross each other.

[0052] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A force arm adjustment mechanism for fitness equipment, characterized in that: The invention comprises a frame (1), an operating frame (2) hinged on the frame (1), and a swing frame (3) hinged on the operating frame (2); a load (5) is mounted on the swing frame (3); an operating unit (6) is provided on the operating frame (2); and a pull rod (4); one end of the pull rod (4) is hinged to the swing frame (3), and the other end of the pull rod (4) is hinged to the frame (1); the pull rod (4) is connected to the swing frame (3) via a ball joint, and the pull rod (4) is connected to the frame (1) via a ball joint; The projection of the hinge point between the operating frame (2) and the frame (1) on the motion plane of the operating frame (2) is point A, the projection of the hinge point between the operating frame (2) and the swing frame (3) on the motion plane of the operating frame (2) is point B, the projection of the hinge point between the pull rod (4) and the swing frame (3) on the motion plane of the operating frame (2) is point C, and the projection of the hinge point between the pull rod (4) and the frame (1) on the motion plane of the operating frame (2) is point D. Points A, B, C and D are connected end to end in sequence to form a convex quadrilateral; As the line AB swings toward the line CD, the angle DAB becomes smaller and the angle ABC becomes larger, causing the load to swing away from point A, thereby increasing the load's lever arm length and allowing the push-pull force to increase as the push-pull stroke increases.

2. The force arm adjustment mechanism for fitness equipment according to claim 1, characterized in that: The load (5) comprises a barbell shaft fixedly connected to the swing frame (3), and a barbell plate is mounted on the barbell shaft.

3. The force arm adjustment mechanism for fitness equipment according to claim 1, characterized in that: The load (5) is arranged at one end of the swing frame (3) away from the hinged connection between the swing frame (3) and the operating frame (2).

4. The force arm adjustment mechanism for fitness equipment according to claim 1, characterized in that: Two operating frames (2) are hingedly connected to the frame (1), and the two operating frames (2) are symmetrically arranged on the left and right.

5. A method for using the force arm adjustment mechanism for fitness equipment according to claim 1, characterized in that: The steps include: a. The load is mounted on the swing frame (3), and the operator pushes and pulls the operating part (6) to rotate the operating part, thereby exercising by overcoming the load force provided by the load; b. When the operating frame (2) rotates, the hinge point between the swing frame (3) and the operating frame (2) moves in a circle around the hinge point between the operating frame (2) and the frame (1), and the hinge point between the pull rod (4) and the swing frame (3) moves in a circle around the hinge point between the pull rod (4) and the frame (1), so that the swing frame (3) rotates at a certain angle relative to the operating frame (2), thereby changing the length of the force arm of the load relative to the hinge point between the frame (1) and the operating frame (2); c. By changing the length of the load arm, the push and pull force of the exerciser can be changed, so that different exercise effects can be achieved for different exercise movements.

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