Constant force strength training resistance source based on spring and implementation method

Abstract

The invention discloses a spring-based constant force strength training resistance source and an implementation method, and is characterized in that the strength training resistance source comprises a rack, a variable-diameter wheel assembly, a guide shaft, a pull rope A, a pull rope B, a spring assembly, a bolt, a bolt fixing plate and a fixed pulley; the guide shaft and the bolt fixing plate are fixedly mounted on the rack; the variable-diameter wheel assembly and the fixed pulley are mounted on the rack and can rotate freely; the spring assembly penetrates through the guide shaft and can move along the guide shaft; the spring assembly comprises a movable pulley, a spring frame, a spring upper fixing pin, a spring, a spring lower pre-tightening pin and a spring fixing block. The spring fixing block is connected with the lower end of the spring through a spring lower pre-tightening pin; the bolt is inserted into the spring fixing block and the bolt fixing plate; the variable-diameter wheel assembly comprises a variable-diameter wheel and a variable-diameter wheel shaft; the variable-diameter wheel is fixedly mounted on the variable-diameter wheel shaft; one end of the pull rope A is fixed at the top end of the rack, and the other end of the pull rope A is fixed on the variable-diameter wheel after penetrating through a movable pulley at the upper part of the spring assembly; one end of the pull rope B is fixed on the reducing wheel, and the other end bypasses the fixed pulley to serve as the output end of the strength training resistance source.

Description

Technical Field

[0001] The invention relates to the field of fitness equipment, in particular to a spring-based constant-force strength training resistance source. Background Art

[0002] Strength training equipment is a common equipment in gyms, fitness centers, and health centers. It is an effective tool for strength training and fitness shaping. At present, the weight of strength training equipment is mostly plug-in type, and the weight during training is adjusted by latches and selector shafts. The characteristic of this kind of weight block is constant resistance. Whether it is exerting force or retracting force, the weight is constant. However, since the size of the resistance is determined by the weight of the iron weight block, the heavier the weight, the higher the cost and the heavier the equipment. In order to improve the bulkiness of the equipment and reduce costs, some strength training products began to choose springs as the source of resistance. However, because the elastic force of the spring is proportional to the deformation, taking the tension spring as an example, the tension of the spring increases linearly with the stretched length of the spring. When the trainer uses this equipment for training, the training effect and experience are not as good as the traditional weight block equipment. In order to solve the problem of uneven resistance of the spring resistance source, we designed a low-cost, spring-based constant force strength training resistance source, which improved the training experience, reduced product costs, and achieved product upgrades. Summary of the invention

[0003] The present invention provides a spring-based constant-force strength training resistance source, characterized in that the strength training resistance source comprises a frame, a variable-diameter wheel assembly, a guide shaft, a pull rope A, a pull rope B, a spring assembly, a latch, a latch fixing plate and a fixed pulley; the guide shaft and the latch fixing plate are fixedly mounted on the frame; the variable-diameter wheel assembly and the fixed pulley are mounted on the frame and can rotate freely; the spring assembly passes through the guide shaft and can move along the guide shaft; the spring assembly comprises a movable pulley, a spring frame, a spring upper fixing pin, a spring, a spring lower preload pin and a spring fixing block; the spring adopts a tension spring; the movable pulley is fixed on the top of the spring frame, and the upper end of the spring is connected to the spring frame by the spring The upper fixing pin is fixed to the upper end of the spring frame, the lower end of the spring is fixed to the lower end of the spring frame through the lower spring preload pin, and the spring fixing block is connected to the lower end of the spring through the lower spring preload pin; the latch is inserted into the spring fixing block and the latch fixing plate; the variable diameter wheel assembly includes a variable diameter wheel and a variable diameter wheel axle; the variable diameter wheel is fixedly mounted on the variable diameter wheel axle; one end of the pull rope A is fixed to the top of the frame, and the other end of the pull rope is fixed to the variable diameter wheel after passing through the movable pulley on the upper part of the spring assembly; one end of the pull rope B is fixed to the variable diameter wheel, and the other end passes around the fixed pulley to serve as the output end of the strength training resistance source.

[0004] One side of the variable-diameter wheel is a cylinder for winding the pull rope A, and the other side is a frustum for winding the pull rope B. On the frustum part of the variable-diameter wheel, there are spiral grooves on the wheel circumference, and the pull rope B winds from the large end to the small end along the grooves. The winding direction of the pull rope A is opposite to that of the pull rope B. The spring in the spring assembly needs to be pre-tightened, and the magnitude of the pre-tightening force is set according to requirements.

[0005] A spring-based constant force strength training resistance source and implementation method, characterized by including the following steps: ① Select the number of springs, the pre-tightening force of a single spring, and the maximum working elastic force according to the resistance size of the resistance source and the grading requirements. Generally, the pre-tightening force is selected to be one-third of the maximum working elastic force. ② Calculate the working length L of the spring according to the elastic coefficient of the spring, that is, the length by which the spring elongates from pre-tightening to the maximum working elastic force of the spring. Then the winding length of the pull rope A wound around the variable-diameter wheel during spring stretching is 2L. Assuming the diameter of the cylindrical part of the variable-diameter wheel around which the pull rope A is wound is D, the number of turns of the pull rope winding is N = 2L / (3.14 * D). For the frustum part of the variable-diameter wheel around which the pull rope B is wound, where the small end diameter is D, the large end diameter is 3D, and the pitch of the spiral groove is P, then the height H of the frustum = P * N. ③ One end of the pull rope A is first fixed to the cylindrical end of the variable-diameter wheel, and then the pull rope A passes through the movable pulley at the upper part of the spring assembly and is fixed to the top of the frame to keep the pull rope A in a tense state. ④ One end of the pull rope B is fixed to the shaft at the large end of the frustum of the variable-diameter wheel, winds from the spiral groove at the large end of the frustum, leads out after winding around the small end of the frustum, and passes through the fixed pulley fixed on the frame as the output end of the strength training resistance source. ⑤ When the pull rope B is input outwards, the pull rope A starts to wind around the cylinder of the variable-diameter wheel, and the spring is stretched. When the pull rope B is retracted, the pull rope A starts to unwind from the cylinder of the variable-diameter wheel, and the spring retracts. ⑥ When the plug is inserted into the spring fixing block and the plug fixing plate, the corresponding spring participates in the work of the resistance source. When the plug is pulled out from the spring fixing block and the plug fixing plate, the corresponding spring does not participate in the work of the resistance source.

[0006] Compared with the prior art, the present invention has the following beneficial effects: 1. Low cost. Compared with the traditional iron breeding block resistance source, the cost of the spring is much lower under the same resistance, and the greater the resistance, the more obvious the cost advantage.

[0007] 2. Stable resistance. The present invention converts the linear change of the spring elastic force into stable and consistent through the variable-diameter wheel, realizes the stable output of the resistance, and at the same time, due to the light weight of the spring, it provides support for the lightweight and miniaturization of the strength training device. Brief Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of the present invention.

[0009] Figure 2 is a schematic structure of the spring assembly of the present invention.

[0010] Figure 3 is a schematic structural diagram of the variable-diameter wheel of the present invention.

[0011] Figure 1 and 2 in Figures 1, 2 and 3: 10 is the frame, 20 is the variable-diameter wheel assembly, 30 is the guide shaft, 40 is the pull rope A, 50 is the pull rope B, 60 is the spring assembly, 70 is the pin, 80 is the pin fixing plate, 90 is the pulley, 21 is the variable-diameter wheel, 22 is the variable-diameter wheel shaft, 61 is the movable pulley, 62 is the spring frame, 63 is the upper spring fixing pin, 64 is the spring, 65 is the lower spring pre-tightening pin, 66 is the spring fixing block. Detailed Embodiment

[0012] To make the objectives, technical solutions and advantages of the present invention clearer, the following further describes a power training device counterweight electric adjustment device proposed by the present invention with reference to the accompanying drawings: Embodiment

[0013] As shown in Figure 1 and Figure 2 and Figure 3As shown in the figure, the present invention provides a spring-based constant force strength training resistance source, which includes a 10-frame, a 20 variable-diameter wheel assembly, a 30 guide shaft, a 40 pull rope A, a 50 pull rope B, a 60 spring assembly, a 70 pin, an 80 pin fixing plate, and a 90 fixed pulley; the 30 guide shaft and the 80 pin fixing plate are fixedly installed on the 10-frame; the 20 variable-diameter wheel assembly and the 90 fixed pulley are installed on the 10-frame and can rotate freely; the 60 spring assembly passes through the 30 guide shaft and can move along the 30 guide shaft; the 60 spring assembly includes a 61 movable pulley, a 62 spring frame, a 63 upper spring fixing pin, a 64 spring, a 65 lower spring pre-tightening pin, and a 66 spring fixing block; the 64 spring is a tension spring; the 61 movable pulley is fixed to the top of the 62 spring frame, the upper end of the 64 spring is fixed to the upper end of the 62 spring frame through the 63 upper spring fixing pin, the lower end of the 64 spring is fixed to the lower end of the 62 spring frame through the 65 lower spring pre-tightening pin, and the 66 spring fixing block is connected to the lower end of the 64 spring through the 65 lower spring pre-tightening pin; the 70 pin is inserted into the 66 spring fixing block and the 80 pin fixing plate; the 20 variable-diameter wheel assembly includes a 21 variable-diameter wheel and a 22 variable-diameter wheel shaft; the 21 variable-diameter wheel is fixedly installed on the 22 variable-diameter wheel shaft; one end of the 40 pull rope A is fixed to the top end of the 10-frame, and after the pull rope passes through the 61 movable pulley at the upper part of the 60 spring assembly, the other end is fixed to the 21 variable-diameter wheel; one end of the 50 pull rope B is fixed to the 21 variable-diameter wheel, and the other end bypasses the 90 fixed pulley and serves as the output end of the strength training resistance source.

[0014] One side of the 21 variable-diameter wheel is a cylinder for winding the 40 pull rope A, and the other side is a frustum for winding the 50 pull rope B; on the frustum part of the 21 variable-diameter wheel, there are spiral grooves on the wheel circumference, and the 50 pull rope B is wound from the large end to the small end along the grooves; the winding direction of the 40 pull rope A is opposite to the winding direction of the 50 pull rope B. The 64 spring in the 60 spring assembly needs to be pre-tightened, and the magnitude of the pre-tightening force is set according to needs.

[0015] A method for realizing a spring-based constant force strength training resistance source, characterized by comprising the following steps: ① Select the number of 64 springs, the pre-tightening force of a single spring, and the maximum working elastic force according to the resistance size and grading requirements of the resistance source. Generally, the pre-tightening force is selected to be one-third of the maximum working elastic force; ② Calculate the working length L of the spring according to the elastic coefficient of the 64 spring, that is, the length by which the 64 spring extends from pre-tightening to the maximum working elastic force of the spring; then the winding length of the 40 drawstring A wound around the variable-diameter wheel during spring stretching is 2L; assuming the diameter of the cylindrical part of the variable-diameter wheel around which the 40 drawstring A is wound is D, the number of turns of the drawstring is N = 2L / (3.14 * D); for the frustum part of the variable-diameter wheel around which the 50 drawstring B is wound, where the small-end diameter is D, the large-end diameter is 3D, and the pitch of the spiral groove is P, then the height H of the frustum is H = P * N; ③ First, one end of the 40 drawstring A is fixed to the cylindrical end of the 21 variable-diameter wheel, and then the 40 drawstring A passes through the 61 movable pulley on the upper part of the 60 spring assembly and is fixed to the top of the 10 frame, keeping the 40 drawstring A in a tensioned state; ④ One end of the 50 drawstring B is fixed to the shaft at the large end of the frustum of the 21 variable-diameter wheel, winds around the spiral groove at the large end of the frustum, leads out after winding around the small end of the frustum, and passes through the 90 fixed pulley fixed on the 10 frame as the output end of the power training resistance source; ⑤ When the 50 drawstring B is input outwards, the 40 drawstring A starts to wind around the cylinder of the 21 variable-diameter wheel, and the 64 spring is stretched; when the 50 drawstring B is retracted, the 40 drawstring A starts to unwind from the cylinder of the 21 variable-diameter wheel, and the 64 spring retracts; ⑥ When the 70 pin is inserted into the 66 spring fixing block and the 80 pin fixing plate, the corresponding 64 spring participates in the work of the resistance source; when the 70 pin is pulled out from the 66 spring fixing block and the 80 pin fixing plate, the corresponding 64 spring does not participate in the work of the resistance source, thereby realizing the adjustment of the resistance size level.

[0016] Using the technical solution of the present invention, those skilled in the art, inspired by the technical solution of the present invention, design similar technical solutions, such as replacing the tension spring in Embodiment 1 with a torque spring and achieving the above technical effects, all fall within the protection scope of the present invention.

Claims

1. The present invention provides a spring-based constant force strength training resistance source and implementation method, characterized in that: The strength training resistance source comprises a frame, a variable diameter wheel assembly, a guide shaft, a pull rope A, a pull rope B, a spring assembly, a latch, a latch fixing plate and a fixed pulley; the guide shaft and the latch fixing plate are fixedly mounted on the frame; the variable diameter wheel assembly and the fixed pulley are mounted on the frame and can rotate freely; the spring assembly passes through the guide shaft and can move along the guide shaft; the spring assembly comprises a movable pulley, a spring frame, an upper spring fixing pin, a spring, a lower spring preload pin and a spring fixing block; the spring adopts a tension spring; the movable pulley is fixed on the top of the spring frame, the upper end of the spring is fixed to the upper end of the spring frame through the upper spring fixing pin, the lower end of the spring is fixed to the lower end of the spring frame through the lower spring preload pin, and the spring fixing block is connected to the lower end of the spring through the lower spring preload pin; the latch is inserted into the spring fixing block and The pin fixing plate; the variable wheel assembly includes a variable wheel and a variable wheel axle; the variable wheel is fixedly installed on the variable wheel axle; the pull rope A is fixed at one end to the top of the frame, and the other end is fixed to the variable wheel after passing through the movable pulley on the upper part of the spring assembly; the pull rope B is fixed to the variable wheel at one end, and the other end is passed around the fixed pulley as the output end of the strength training resistance source; one side of the variable wheel is a cylinder for winding the pull rope A, and the other side is a frustum for winding the pull rope B; the frustum part of the variable wheel has a spiral groove around the wheel, and the pull rope B is wound from the large end to the small end along the groove; the winding direction of the pull rope A is opposite to the winding direction of the pull rope B; the spring in the spring assembly needs to be pre-tightened, and the size of the pre-tightening force is set according to needs; a constant force strength training resistance source based on a spring and an implementation method, characterized in that it includes the following steps: ① According to the resistance size and classification requirements of the resistance source, select the number of springs, the preload force of a single spring and the maximum working elastic force. Generally, the preload force is selected to be one third of the maximum working elastic force; ② According to the elastic coefficient of the spring, calculate the working length L of the spring, that is, the length of the spring extended from pre-tightening to the maximum working elastic force of the spring; then the winding length of the rope A wound on the variable wheel when the spring is stretched is 2L; assuming that the diameter of the cylindrical part of the variable wheel around which the rope A is wound is D, the number of turns of the rope winding is N=2L / (3.14*D); the cone part of the variable wheel around which the rope B is wound, where the small end diameter is D and the large end diameter is 3D, and the pitch of the spiral groove is P, then the height of the cone H=P*N; ③ One end of the pull rope A is first fixed to the cylindrical end of the reducer wheel, and then the pull rope A passes through the movable pulley on the upper part of the spring assembly and is fixed to the top of the frame to keep the pull rope A in a tense state; ④ One end of the pull rope B is fixed to the shaft of the large end of the truncated cone of the variable diameter wheel, and is wound from the spiral groove of the large end of the truncated cone, and is led out after bypassing the small end of the truncated cone, and passes through the fixed pulley fixed on the frame as the output end of the strength training resistance source; ⑤ When the pull rope B is input outward, the pull rope A begins to wrap around the cylinder of the variable diameter wheel, and the spring is stretched; when the pull rope B is retracted, the pull rope A begins to unwind from the cylinder of the variable diameter wheel, and the spring retracts; ⑥ When the latch is inserted into the spring fixing block and the latch fixing plate, the corresponding spring participates in the work of the resistance source, and when the latch is pulled out of the spring fixing block and the latch fixing plate, the corresponding spring does not participate in the work of the resistance source.

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