A force training device with a force converter
By designing a force converter with direct and double force transmission modes, the problem of output power limitation of resistance motors is solved, enabling safe and reliable switching of resistance motors under different training modes, meeting various training needs and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DONGGUAN YIYI SUGAR MANAGEMENT CO LTD
- Filing Date
- 2023-05-16
- Publication Date
- 2026-06-05
AI Technical Summary
In existing resistance training devices, the maximum output power limitation of the resistance motor restricts the applicability of low-strength training, and the pulley transmission method is prone to safety accidents, failing to meet the training requirements of high weight speed and low weight speed.
Design a tension converter with two working modes: direct tension transmission and double tension transmission. The tension multiplier can be adjusted by switching the traction rope between different rope holes. The converter includes a traction rope channel, a free rope hole, and a locking rope hole, and can switch between the two working modes.
While keeping the resistance motor power constant, it meets the training needs of heavy weights at slow speeds and light weights at fast speeds, improving training effectiveness while reducing safety hazards and manufacturing costs.
Smart Images
Figure CN116570879B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a force converter, and more particularly to a force converter for a strength trainer that has two working modes: direct force transmission and double force transmission, and can freely switch between the two working modes. Background Technology
[0002] As we all know, physical exercise is the best way to maintain good health, and regular muscle training is the best way to maintain health, shape the body, and promote well-being. To facilitate muscle training, various fitness equipment are now widely used.
[0003] like Figure 1 As shown, resistance trainers are currently the most widely used fitness equipment. The working principle of resistance trainers is as follows: a tension device 2 is set at one end of the traction rope 1. The tension device 2 can be a handle, a lever, a push rod, etc. Correspondingly, a resistance device 3 is set at the other end of the traction rope 1. The resistance device 3 can be a counterweight, a resistance motor, etc. When working, the resistance device 3 generates resistance, which is transmitted to the tension device 2 through the traction rope 1. The tension device 2 acts on the human body to achieve the purpose of training human muscles.
[0004] like Figure 2 As shown, in order to change the direction of resistance transmission and make it easier for people to use, some fixed pulleys 4 are often installed in practice to achieve this purpose. In practice, various home strength training equipment utilizes this principle, such as leg press machines, chest press machines, etc.
[0005] Generally, resistance devices 3 in public gyms are mostly weight plates. However, in order to reduce weight and floor space, resistance devices 3 in home fitness equipment are mostly resistance motors.
[0006] like Figures 2 to 4 As shown, when the resistance device 3 is a resistance motor 31, there are generally two resistance transmission methods.
[0007] like Figure 2 As shown, this is a fixed pulley transmission method. The main advantage of this transmission method is that the force is transmitted directly, and the resistance can be directly transmitted to the tension device 2 through the traction rope 1.
[0008] Its main drawback is that, limited by the maximum output power of the resistance motor 31, this transmission method can only meet the needs of light-weight muscle training, thus limiting its applicability. For example, if the resistance motor 31 can only output a maximum resistance of 60 kg, then it can only meet the training requirements for weights below 60 kg. To meet the training requirements for heavy weights, the maximum output power of the resistance motor 31 needs to be doubled, but this would not only significantly increase the cost of the motor but also create some safety hazards.
[0009] like Figure 3 , Figure 4 As shown, under the rated maximum output power of the resistance motor 31, a movable pulley transmission method is used in order to increase the training weight.
[0010] The main advantage of this transmission method is that, by utilizing the mechanical principle of the movable pulley, the training weight can be doubled even when the maximum output power of the resistance motor 31 is at its rated value.
[0011] However, its main drawback is that it is extremely easy for the rope to get tangled, which can lead to safety accidents.
[0012] The specific causes of the safety accident are described below. When people conduct strength training, there are two training methods: Method 1 is heavy weight slow speed training, and Method 2 is light weight fast speed training.
[0013] like Figure 3 As shown, under Method 1, the aforementioned pulley transmission method can generally meet the training requirements. In this case, the output power of the resistance motor 31 is relatively large, and the resistance it generates is also relatively large. Since the large resistance acts on the human body, the human body can only complete the load-bearing task by reducing the speed of movement.
[0014] For example, the resistance motor 31 outputs a resistance of 60 kg. Through the movable pulley 5, the resistance at the position of the pulling device 2 will reach 120 kg. Under this load condition, the human body can only overcome the resistance and complete the load training by moving slowly.
[0015] The traction rope 1 is wound around the rotating output shaft of the resistance motor 31. In mode one, when the human body performs training movements, the resistance motor 31 rotates and slowly releases the traction rope 1. When the human body performs recovery movements, the resistance motor 31 rotates and slowly winds back the traction rope 1.
[0016] In Method 1, the resistance motor 31 can work with the slow movement training of the human body at a low speed, and the speed of the resistance motor 31 can match its action of releasing and retracting the traction rope 1.
[0017] like Figure 4 As shown, however, in the case of method two, the above-mentioned movable pulley transmission method cannot meet the training requirements.
[0018] In the second scenario, the output power of the resistance motor 31 is relatively small, and the resistance it generates is also relatively small. Due to the smaller resistance, the speed of human movement will inevitably increase, and the frequency of reciprocating movement will also inevitably increase.
[0019] For example, the resistance motor 31 outputs 1 kg of resistance. Through the action of the movable pulley 5, the resistance at the position of the pulling device 2 is 2 kg. Under such light load conditions, the human body can easily overcome the resistance to complete the training movement. Therefore, the speed of the human body's movement will inevitably increase, and the frequency of reciprocating movement will also inevitably increase.
[0020] In this situation, the resistance motor 31 needs to rotate twice as fast as in method one to complete the winding and retrieving of the traction rope 1. However, in practice, the performance of the resistance motor 31 often fails to meet the above requirements, which inevitably leads to the resistance motor 31 not "retrieving" the rope in time. Once this happens, the traction rope 1 will inevitably become "slack" or "entangled" at the position of the movable pulley 5, which may lead to a safety accident.
[0021] As mentioned above, these are the main drawbacks of the existing technology. Summary of the Invention
[0022] The technical solution adopted in this invention is as follows: a force converter (100a) for a strength training device, characterized in that: the force converter (100a) includes a traction rope channel (110a), a free rope hole (111a), a locking rope hole (112a), and a connecting end fixing position (113a), wherein the free rope hole (111a) and the locking rope hole (112a) are respectively located at the two ends of the traction rope channel (110a).
[0023] The traction rope (30) is simultaneously threaded through the traction rope channel (110a), the free rope hole (111a), and the locking rope hole (112a). The traction rope (30) has a winding end (31) and a connecting end (32). The winding end (31) is wound around the rotating output shaft of the resistance motor (20), and the connecting end (32) is movably connected to the tension converter (100a).
[0024] The force converter (100a) is connected to the force generator (40).
[0025] The force converter (100a) has two working modes: direct force transmission and double force transmission. In the direct force transmission mode, the connecting end (32) of the traction rope (30) is fixed at the locking rope hole (112a). The force (F) generated by the resistance motor (20) is directly transmitted to the tensioner (40) through the traction rope (30) and the force converter (100a).
[0026] In this double-force transmission mode, the connecting end (32) of the traction rope (30) is fixed in the connecting end fixing position (113a), the force converter (100a) is located between the winding end (31) of the traction rope (30) and the connecting end (32) of the traction rope (30), and the traction rope (30) forms a first traction rope tension portion (12) between the force converter (100a) and the connecting end fixing position (113a). 1a) The traction rope (30) forms a second traction rope tension portion (122a) between the tension converter (100a) and the winding end (31). The tension (F) generated by the resistance motor (20) is transmitted to the traction rope (30). The tension converter (100a) converts the tension (F) into the double tension (Fa). The double tension (Fa) is transmitted to the tensioner (40) through the tension converter (100a).
[0027] The beneficial effects of this invention are as follows: This invention includes a force converter with two operating modes: direct force transmission and double force transmission. In the direct force transmission mode, the force converter directly transmits the force generated by the resistance motor to the resistance band. In the double force transmission mode, the force converter converts the force generated by the resistance motor into double the force, and then transmits this double force to the resistance band. Furthermore, the force converter can switch between these two operating modes. When the invention operates in the direct force transmission mode, it meets the requirements for high-speed training with light weights; when it operates in the direct force transmission mode, it meets the requirements for slow-speed training with heavy weights. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of an existing resistance training device.
[0029] Figure 2 A schematic diagram illustrating the principle of adding a fixed pulley to an existing resistance training device.
[0030] Figure 3 This is a schematic diagram of the motion of performing heavy weight, slow speed training with a resistance trainer in the prior art.
[0031] Figure 4 This is a schematic diagram of the motion for performing light weight, high speed training with a resistance trainer in the prior art.
[0032] Figure 5 This is a schematic diagram illustrating the two working modes of this invention: direct force transmission and force transmission at multiple levels.
[0033] Figure 6 This is a three-dimensional structural diagram of the present invention.
[0034] Figure 7 This is a schematic diagram illustrating the operation of the present invention.
[0035] Figure 8 This is a schematic diagram of the force converter of the present invention in the mode of directly transmitting tensile force.
[0036] Figure 9 This is a schematic diagram of the force converter of the present invention in the mode of double force transmission.
[0037] Figure 10 This is a schematic diagram of the tension converter in Embodiment 1 of the present invention.
[0038] Figure 11 This is a schematic diagram illustrating the switching between two working modes of the force converter in Embodiment 1 of the present invention: direct force transmission and double force transmission.
[0039] Figure 12 This is a schematic diagram of the force converter in the direct force transmission mode of Embodiment 1 of the present invention.
[0040] Figure 13 This is a schematic diagram of the force converter in the double-force transmission mode in Embodiment 1 of the present invention.
[0041] Figure 14 This is a schematic diagram of the tension converter traction rope channel, free rope hole, and locking rope hole in Embodiment 1 of the present invention.
[0042] Figure 15 This is an exploded view of the structure of Embodiment 1 of the present invention.
[0043] Figure 16 This is a schematic diagram illustrating the working principle of the card head in Embodiment 1 of the present invention.
[0044] Figure 17 This is a schematic diagram of the card head structure in Embodiment 1 of the present invention.
[0045] Figure 18 This is a schematic diagram of the mutual sensing between the first sensor and the second sensor in Embodiment 1 of the present invention.
[0046] Figure 19This is a schematic diagram of the card head being inserted into the fixing hole in Embodiment 1 of the present invention.
[0047] Figure 20 This is a schematic diagram of the traction rope guide in Embodiment 1 of the present invention. Detailed Implementation
[0048] like Figures 5 to 9 As shown, this invention provides an applicable scenario for a force converter used in a strength trainer, particularly as follows: Figure 5 As shown, the force converter (100) of the present invention is applicable to a strength training device, which includes a body, a resistance motor (20) and a traction rope (30), wherein the resistance motor (20) is fixedly disposed in the body.
[0049] The traction rope (30) has a winding end (31) and a connecting end (32), wherein the winding end (31) is wound around the rotating output shaft of the resistance motor (20), and the connecting end (32) is located outside the machine body and is movably connected in the tension converter (100).
[0050] The force converter (100) is connected to a force generator (40).
[0051] In practice, the tensioner (40) can be a tension handle, a load bar, or other tensioning device.
[0052] When in use, firstly, the resistance motor (20) works and generates a pulling force (F). Then, the pulling force (F) is transmitted to the force converter (100) through the traction rope (30). Finally, the force converter (100) transmits the pulling force (F) to the tensioner (40). At this moment, the tensioner (40) applies the pulling force (F) to the human body to bear weight and thus achieve the effect of exercising muscles.
[0053] In practical applications, when the resistance band (40) is a pull handle, the user can pull the pull handle to achieve the purpose of training the upper limb muscles, such as training the biceps, pectoralis major, latissimus dorsi, etc.
[0054] When the resistance band (40) is used as a weight bar, the user can carry the weight bar on their shoulder to train the muscles of the lower limbs, such as leg muscles and hip muscles.
[0055] The resistance motor (20) is able to generate a pulling force (F), which is transmitted to the tensioner (40) through the traction rope (30) and the tension converter (100).
[0056] The force converter (100) has two working modes: direct force transmission and force transmission in multiple stages.
[0057] In this direct force transmission mode, the force converter (100) can directly transmit the force (F) to the force generator (40).
[0058] In this multi-level tensile force transmission mode, the tensile force converter (100) can convert the tensile force (F) into a multi-level tensile force (Fs), and then transmit the multi-level tensile force (Fs) to the tensioner (40).
[0059] The force converter (100) can switch between two operating modes: direct force transmission and multiplier force transmission.
[0060] For ease of understanding, the following example is given. For instance, the pulling force (F) generated by the resistance motor (20) is 60 kg. In the direct transmission of pulling force working mode, the force converter (100) can directly transmit the 60 kg pulling force (F) to the tensioner (40). In this case, the force converter (100) can be a simple hook connector.
[0061] In the operation mode of transmitting tension in multiple stages, the tension converter (100) can convert the tension (F) of 60 kg into a multiple-stage tension (Fs) of two or three times the tension (F), and then transmit the multiple-stage tension (Fs) to the tensioner (40). At this time, the tension on the tensioner (40) is 120 kg or 180 kg. In this case, the tension converter (100) can be a movable pulley or a pulley block.
[0062] In practical applications, since the product of this invention is used for training human muscles, and the human body has limited load capacity, in practice, in the working mode of transmitting tensile force at multiple levels, it is sufficient to provide double the tensile force to fully meet the needs of the human body's load capacity limit. Moreover, when providing double the tensile force, the product has a simpler structural design and relatively lower manufacturing cost, as described in detail below.
[0063] like Figures 6 to 9 As shown, this invention provides a force converter for a strength trainer in a scenario where double the force is applied. The force converter (100) of this invention is applicable to a strength trainer, which includes a body (10), a resistance motor (20), and a traction rope (30), wherein the resistance motor (20) is fixedly installed in the body (10).
[0064] The traction rope (30) has a winding end (31) and a connecting end (32), wherein the winding end (31) is wound around the rotating output shaft of the resistance motor (20), and the connecting end (32) is located outside the body (10) and is movably connected to the tension converter (100).
[0065] The force converter (100) is connected to a force generator (40).
[0066] The resistance motor (20) is able to generate a pulling force (F), which is transmitted to the tensioner (40) through the traction rope (30) and the tension converter (100).
[0067] The force converter (100) has two working modes: direct force transmission and double force transmission.
[0068] like Figure 8 As shown, in this direct force transmission mode, the force converter (100) can directly transmit the force (F) to the force generator (40).
[0069] like Figure 9 As shown, in this double-transmission tension mode, the tension converter (100) can convert the tension (F) into double tension (Fa), and then transmit the double tension (Fa) to the tensioner (40).
[0070] The force converter (100) can switch between two operating modes: direct force transmission and double force transmission.
[0071] Since the product of this invention is used for training human muscles, and the human body has a limited load capacity, in practice, the double-transmission tension working method can fully meet the needs of the human body's load capacity limit. Moreover, the double-transmission tension working method is relatively simple in terms of structural design and relatively inexpensive to manufacture.
[0072] When the force converter (100) has two working modes, namely direct force transmission and double force transmission, there are several preferred implementation methods, as described below.
[0073] like Figures 10 to 20 As shown, implementation method one, especially as Figures 10 to 11 As shown, the tension converter (100a) includes a traction rope channel (110a), a free rope hole (111a), a locking rope hole (112a), and a connecting end fixing position (113a).
[0074] The free rope hole (111a) and the locking rope hole (112a) are located at the two ends of the traction rope channel (110a), respectively.
[0075] The connection end fixing position (113a) can be set on the body (10) or outside the body (10).
[0076] The traction rope (30) is simultaneously threaded through the traction rope channel (110a), the free rope hole (111a), and the locking rope hole (112a).
[0077] In practice, the traction rope channel (110a) can be either a closed channel or an open channel.
[0078] like Figure 12 As shown, in the direct transmission of tension mode, the tensioner (40) is connected to the tension converter (100a), and the connecting end (32) of the traction rope (30) is fixed at the locking rope hole (112a).
[0079] The pulling force (F) generated by the resistance motor (20) is directly transmitted to the tensioner (40) through the traction rope (30) and the tension converter (100a).
[0080] At this moment, the training force (Fc) generated on the resistance device (40) is equal to the pulling force (F) generated by the resistance motor (20), thereby meeting the requirements of the method two small weight fast speed training described in the background art.
[0081] like Figure 13 As shown, in the double-transmission tension mode, the tensioner (40) is connected to the tension converter (100a), and the connecting end (32) of the traction rope (30) is fixed in the connecting end fixing position (113a).
[0082] The tension converter (100a) is located between the winding end (31) of the traction rope (30) and the connecting end (32) of the traction rope (30).
[0083] The traction rope (30) forms a first traction rope tension portion (121a) between the tension converter (100a) and the connection end fixing position (113a).
[0084] The traction rope (30) forms a second traction rope tension portion (122a) between the tension converter (100a) and the winding end (31).
[0085] The tension (F) generated by the resistance motor (20) is transmitted to the traction rope (30), and the tension converter (100a) converts the tension (F) into the double tension (Fa), which is then transmitted to the tensioner (40) through the tension converter (100a).
[0086] At this moment, the training force (Fc) generated on the resistance band (40) is equal to the double pulling force (Fa). The training force (Fc) generated on the resistance band (40) is twice the pulling force (F) generated by the resistance motor (20), thereby meeting the requirements of heavy weight slow speed training as described in the background art.
[0087] like Figure 11 As shown, by fixing the connecting end (32) at the locking rope hole (112a) or in the connecting end fixing position (113a), the switching between the two working modes of direct transmission of tension and double transmission of tension can be realized.
[0088] In other words, when the connecting end (32) is fixed in the locking rope hole (112a), people can perform single-force, low-weight, high-speed training. When the connecting end (32) is fixed in the connecting end fixing position (113a), people can perform double-force, high-weight, slow-speed training. This achieves the goal of doubling the training force (Fc) while keeping the power of the resistance motor (20) constant, and the switching method is simple and reliable.
[0089] In specific implementation, such as Figure 14 As shown, the tension converter (100a) includes a wheel (130a) and a wheel housing (140a). The wheel (130a) is rotatably disposed in the wheel housing (140a). The traction rope channel (110a) is located between the wheel (130a) and the wheel housing (140a). The free rope hole (111a) and the locking rope hole (112a) are disposed on the wheel housing (140a). The free rope hole (111a) and the locking rope hole (112a) are respectively connected to the traction rope channel (110a).
[0090] In practice, the free rope hole (111a) is located below the wheel housing (140a), and the locking rope hole (112a) is located on one side of the wheel housing (140a) to facilitate the insertion of the traction rope (30) and to facilitate the switching of working modes.
[0091] In practice, the wheel (130a) is provided with a rope groove to facilitate the positioning of the traction rope (30).
[0092] In specific implementation, such as Figure 15 As shown, the wheel housing (140a) includes a cover (141a), a bracket (142a), and a pivot (143a), wherein the pivot (143a) is inserted into the wheel (130a), and both ends of the pivot (143a) pass through the cover (141a) and are pivotally connected to the bracket (142a).
[0093] In practice, the cover (141a) includes a first cover (144a) and a second cover (145a), which are fastened together to form the cover (141a).
[0094] In practice, the hanger (142a) includes a first cap (146a), a second cap (147a), and a hook (148a).
[0095] The first cap (146a) and the second cap (147a) are respectively placed on both sides of the cover (141a).
[0096] The hook (148a) is connected to a connector (149a) for easy connection to the tensioner (40).
[0097] In specific implementation, such as Figure 16 As shown, the connecting end (32) of the traction rope (30) is provided with a clip (150a). The clip (150a) allows the connecting end (32) to be easily fixed in the locking rope hole (112a) or in the connecting end fixing position (113a), so as to facilitate switching between the two working modes of direct transmission of tension and double transmission of tension.
[0098] like Figure 17 As shown, in practice, the card head (150a) includes a fixing part (151a) and a snap-fit part (152a), wherein the fixing part (151a) is used to fix the connecting end (32).
[0099] The snap-fit part (152a) is used to fix the connecting end (32) in the locking rope hole (112a) or in the connecting end fixing position (113a).
[0100] In practice, the fixing part (151a) is the inner cavity of the card head (150a), and the connecting end (32) is fixed in the inner cavity of the card head (150a).
[0101] A retaining ring (153a) can be fitted onto the connecting end (32) for easy fixing.
[0102] In practice, the snap-fit part (152a) includes a tube body and a snap ring, wherein the snap ring protrudes from the end of the tube body.
[0103] In specific implementation, such as Figure 15 As shown, the tension converter (100a) also includes a traction rope guide (160a).
[0104] The traction rope (30) is threaded through the traction rope guide (160a), which is used to change the direction of the tension transmission of the traction rope (30).
[0105] The traction rope guide (160a) is equipped with a fixed pulley block, through which the traction rope (30) passes.
[0106] In practice, the traction rope guide (160a) is pivotally connected to the body (10).
[0107] The pulley assembly includes a main pulley (161a) and a secondary pulley (162a), with the traction rope (30) threaded between the main pulley (161a) and the secondary pulley (162a).
[0108] The above structure allows the path of the traction rope (30) to be changed at any time during training, making it convenient for people to use.
[0109] In practice, the connection end fixing position (113a) can be implemented in various ways to achieve its function. A preferred implementation is described below.
[0110] like Figure 18 As shown, a first sensor (171a) is provided in the fixed position (113a) of the connection end, and a second sensor (172a) is provided on the connection end (32) of the traction rope (30) corresponding to the first sensor (171a).
[0111] When the connecting end (32) is fixed in the connecting end fixing position (113a) under the double tensile force transmission mode, the first sensor (171a) and the second sensor (172a) sense each other and generate a sensing signal.
[0112] In this direct force transmission mode, no sensing signal is generated between the first sensor (171a) and the second sensor (172a).
[0113] In practice, the sensing signal can be transmitted to the user in the form of sound, image or other forms so that the user can know the working status of the resistance training system. In practice, the sensing signal can be an alarm sound or an image warning icon on the display screen of the resistance training system.
[0114] In practice, the first sensor (171a) can be a magnetic sensor, and the second sensor (172a) can be a magnetic block.
[0115] In specific implementation, such as Figure 19As shown, the connecting end fixing position (113a) includes a fixing hole (181a) and a card cover (182a). Corresponding to the fixing hole (181a), a card head (150a) is provided on the connecting end (32).
[0116] like Figure 13 As shown, in the double-transmitting tensile force working mode, the card head (150a) is inserted into the fixing hole (181a), and the card cover (182a) is snapped onto the card head (150a), thereby fixing the card head (150a) in the fixing hole (181a).
[0117] like Figure 12 As shown, in the direct transmission of tension mode, the cover (182a) is opened, the clip (150a) is pulled out from the fixing hole (181a), and the clip (150a) is engaged with the locking rope hole (112a) of the tension converter (100a).
[0118] like Figure 17 , 18 As shown, in a specific implementation, the first sensor (171a) is disposed in the fixing hole (181a), and the second sensor (172a) is disposed in the card head (150a).
[0119] In specific implementation, such as Figure 19 As shown, the connecting end fixing position (113a) is located on the traction rope guide (160a). The cover (182a) is a push-pull cover.
Claims
1. A resistance converter (100a) for a strength training device, characterized in that: The tension converter (100a) includes a traction rope channel (110a), a free rope hole (111a), a locking rope hole (112a), and a connecting end fixing position (113a). The free rope hole (111a) and the locking rope hole (112a) are located at the two ends of the traction rope channel (110a), respectively. The traction rope (30) is simultaneously threaded through the traction rope channel (110a), the free rope hole (111a), and the locking rope hole (112a). The traction rope (30) has a winding end (31) and a connecting end (32), wherein the winding end (31) is wound around the rotating output shaft of the resistance motor (20), and the connecting end (32) is movably connected to the force converter (100a). The force converter (100a) is connected to the force generator (40). This force converter (100a) has two operating modes: direct force transmission and double force transmission. In the direct tension transmission mode, the connecting end (32) of the traction rope (30) is fixed at the locking rope hole (112a). The pulling force (F) generated by the resistance motor (20) is directly transmitted to the tensioner (40) through the traction rope (30) and the tension converter (100a). In this double-force transmission mode, the connecting end (32) of the traction rope (30) is fixed in the connecting end fixing position (113a). The force converter (100a) is located between the winding end (31) of the traction rope (30) and the connecting end (32) of the traction rope (30). The traction rope (30) forms a first traction rope tension portion (121a) between the tension converter (100a) and the connecting end fixing position (113a). The traction rope (30) forms a second traction rope tension portion (122a) between the tension converter (100a) and the winding end (31). The tension (F) generated by the resistance motor (20) is transmitted to the traction rope (30), and the tension converter (100a) converts the tension (F) into the double tension (Fa), which is then transmitted to the tensioner (40) through the tension converter (100a).
2. The resistance converter for a strength trainer as described in claim 1, characterized in that: By fixing the connecting end (32) at the locking rope hole (112a) or in the connecting end fixing position (113a), the switching between the two working modes of direct tensile force transmission and double tensile force transmission can be realized.
3. The resistance converter for a strength trainer as described in claim 1, characterized in that: The tension converter (100a) includes a wheel (130a) and a wheel housing (140a). The wheel (130a) is rotatably disposed in the wheel housing (140a). The traction rope channel (110a) is located between the wheel (130a) and the wheel housing (140a). The free rope hole (111a) and the locking rope hole (112a) are disposed on the wheel housing (140a). The free rope hole (111a) and the locking rope hole (112a) are respectively connected to the traction rope channel (110a).
4. The resistance converter for a strength trainer as described in claim 3, characterized in that: The wheel housing (140a) includes a cover (141a), a bracket (142a), and a pivot (143a), wherein the pivot (143a) is inserted into the wheel (130a), and both ends of the pivot (143a) pass through the cover (141a) and are pivotally connected to the bracket (142a).
5. A resistance converter for a strength training device as described in claim 1, characterized in that: The connecting end (32) of the traction rope (30) is provided with a locking head (150a), which can be used to fix the connecting end (32) in the locking rope hole (112a) or in the connecting end fixing position (113a).
6. The resistance converter for a strength trainer as described in claim 5, characterized in that: The clip (150a) includes a fixing part (151a) and a snap-fit part (152a), wherein the fixing part (151a) is used to fix the connecting end (32). The snap-fit part (152a) is used to fix the connecting end (32) in the locking rope hole (112a) or in the connecting end fixing position (113a).
7. A resistance converter for a strength trainer as described in claim 1, characterized in that: The tension converter (100a) also includes a traction rope guide (160a) through which the traction rope (30) passes, and the traction rope guide (160a) is used to change the direction of tension transmission of the traction rope (30).
8. A resistance converter for a strength training device as described in claim 1, characterized in that: A first sensor (171a) is provided in the fixed position (113a) of the connection end, and a second sensor (172a) is provided on the connection end (32) of the traction rope (30) corresponding to the first sensor (171a). In this double-force transmission mode, when the connecting end (32) is fixed in the connecting end fixing position (113a), the first sensor (171a) and the second sensor (172a) sense each other and generate a sensing signal. In this direct force transmission mode, no sensing signal is generated between the first sensor (171a) and the second sensor (172a).
9. A resistance converter for a strength training device as described in claim 1, characterized in that: The connecting end fixing position (113a) includes a fixing hole (181a) and a clip cover (182a). Corresponding to the fixing hole (181a), a clip head (150a) is provided on the connecting end (32). In this double-force transmission mode, the clip (150a) is inserted into the fixing hole (181a), and the cover (182a) is snapped onto the clip (150a), thereby fixing the clip (150a) in the fixing hole (181a). In this direct force transmission mode, the cover (182a) opens, the clip (150a) is pulled out from the fixing hole (181a), and the clip (150a) engages with the locking rope hole (112a) of the force converter (100a).
10. A resistance converter for a strength trainer as described in claim 9, characterized in that: The first sensor (171a) is disposed in the fixing hole (181a), and the second sensor (172a) is disposed in the card head (150a). In the double-force transmission mode, the first sensor (171a) and the second sensor (172a) sense each other and generate a sensing signal. In the direct-force transmission mode, the first sensor (171a) and the second sensor (172a) do not generate such a sensing signal.