Load control unit

Abstract

Provided is a load control unit (1) that is post-installed on a weight stack-type training device (100), the load control unit comprising: a unit case (17) that accommodates a load control mechanism; two grooves (17a, 17b) provided in the unit case so as to respectively face a left guide shaft (105-2) and a right guide shaft (105-3); and flanges (17c) for fixing the unit case to a lower frame (101-4) of the training device.

Description

Load Control Unit

[0001] The present invention relates to a load control unit.

[0002] Patent Document 1 describes a training data measuring device that can be easily retrofitted to an existing training machine.

[0003] Japanese Patent Application Publication No. 2005-198770

[0004] The present disclosure aims to provide a novel configuration that takes into consideration long-term stability and accurate positioning of a device that can be retrofitted onto existing training equipment.

[0005] In order to solve the above-mentioned problems, one aspect of the present invention provides a load control unit that is retrofitted to training equipment, the training equipment comprising: two guide shafts arranged at either end of the weight stack to align the weight stack vertically; a lift shaft that passes vertically through the weight stack to raise and lower the weight stack vertically; and a rectangular frame arranged to surround the weight stack; a load control mechanism including a cable with an attachment device at its end that can be attached to the lift shaft; a unit case that houses the load control mechanism; two opposing grooves that are provided in the unit case so as to face each of the two guide shafts when the load control unit is retrofitted to the training equipment, at least one of which is one of the two grooves into which the opposing guide shaft fits; and a fixing device that is provided in the unit case so as to face a lower frame that constitutes the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

[0006] Another aspect of the present invention is a load control unit that is retrofitted to training equipment, and the training equipment includes a guide shaft arranged on the weight stack to align the weight stack vertically, a lift shaft that passes vertically through the weight stack to raise and lower the weight stack vertically, and a rectangular frame arranged to surround the weight stack, a load control mechanism including a cable with an attachment device at its tip that can be attached to the lift shaft, a unit case that houses the load control mechanism, grooves provided in the unit case so as to face the guide shafts when the load control unit is retrofitted to the training equipment, and into which the opposing guide shafts are fitted, and a fixing device provided in the unit case so as to face a lower frame that constitutes the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

[0007] According to one aspect of the present invention, it is possible to provide a novel configuration that takes into consideration the long-term stability and accurate positioning of a device that is retrofitted to existing training equipment.

[0008] FIG. 1 is a schematic diagram showing the general configuration of a training tool in which a load control unit according to an embodiment of the present invention is disposed; FIG. 2 is a cross-sectional view of the load control unit as seen from the left in the left-right direction; FIG. 3 is an explanatory view for explaining an overview of a procedure for installing the load control unit in the training tool; FIG. 4 is a cross-sectional view of a flange, a pin, and a lower frame in the front-rear direction; FIG. 5 is a schematic diagram showing the general configuration of a unit case, which is a cross-sectional view as seen from the top-bottom direction; and FIG. 6 is a schematic diagram showing the general configuration of a modified example of the unit case, which is a cross-sectional view as seen from the top-bottom direction.

[0009] [Embodiment] (Overall Configuration) FIG. 1 is a schematic diagram showing the overall configuration of a training device 100 in which a load control unit 1 according to an embodiment of the present invention is disposed. The training device 100 employs a weight stack system. For simplicity of illustration, FIG. 1 does not show a seat on which a user of the training device 100 sits, or handles that the user holds with both hands to perform movements appropriate for the training, specifically, movements such as pushing apart or lifting. Also not shown are pedals and footplates used by the user when training their feet. These pedals and footplates are used by the user to push, pull, or step on their feet while seated. The handles, pedals, and footplates are connected to the weight stack via cables.

[0010] The training device 100 is a training device for exercise or rehabilitation aimed at strengthening muscles.

[0011] The training device 100 has a structure in which multiple weight plates are stacked, and the user can select the desired weight by changing the pins. The weight stack system allows the user to quickly and easily adjust the training load. The weight plates are used as load for the training device 100 via cables and pulleys, allowing for a variety of training methods depending on the type of training. This allows the user to perform effective muscle training.

[0012] The training device 100 only allows weight setting for each weight plate, and the user must combine multiple plates to select a specific weight.

[0013] The resistance control unit 1 detects the movement of the weight stack in real time and can add additional resistance to the weight selected by the user. The resistance control unit 1 allows the user to finely adjust the resistance.

[0014] The training device 100 will be described in detail below with reference to Fig. 1. In Fig. 1 and Figs. 2 to 6 described later, this embodiment will be described with reference to the up-down direction, which is the vertical direction, as well as the left-right direction and front-rear direction, which are orthogonal to the up-down direction, shown in each drawing.

[0015] 1 to 4 show specific examples of the present embodiment, but these shapes do not limit the present embodiment. These shapes are merely examples, and other shapes are also included in the technical scope of the present invention.

[0016] As shown in FIG. 1, the training device 100 has a frame (hereinafter referred to as "frame 101") consisting of a right frame 101-1, an upper frame 101-2, a left frame 101-3, and a lower frame 101-4, a cable 102, a pulley group (hereinafter referred to as "pulley group 103") consisting of pulleys 103-1, 103-2, 103-3, and 103-4, a weight stack 104, and a shaft group consisting of a lift shaft 105-1, a left guide shaft 105-2, and a right guide shaft 105-3.

[0017] The frame 101 is a skeleton that supports the weight stack 104. The right frame 101-1 and the left frame 101-3 are arranged in the vertical direction and are connected by an upper frame 101-2 and a lower frame 101-4. The frame 101 is a rectangular frame that has a rectangular shape when viewed from the front-to-rear direction in a plan view.

[0018] The cable 102 is used by the user to apply a load, and one end 102a is connected to a handle that the user holds with his or her hand, while the other end 102b is fixed to the upper frame 101-2. The pulley group 103 is arranged to ensure smooth movement of the cable 102, and each pulley has a rotatable structure.

[0019] The pulley 103-4 is hung on the cable 102 and connected to the tip of the lift shaft 105-1. When one end 102a of the cable 102 is pulled, the pulley 103-4 rises because the other end 102b of the cable 102 is fixed to the upper frame 101-2, and as the pulley 103-4 rises, the lift shaft 105-1 also rises.

[0020] The pulley 103-4 is not essential to the training device 100, but using the pulley 103-4 provides the following effect. That is, the pulley 103-4 functions as a movable pulley, and increases the stroke when the user pulls one end 102a of the cable 102. As a result, the user's stroke is doubled compared to when the pulley 103-4 is not used. Using the pulley 103-4 increases the user's stroke range, allowing for more effective training.

[0021] When the pulley 103-4 is not used, the tip of the lift shaft 105-1 is connected to the other end 102b of the cable 102 fixed to the upper frame 101-2 in FIG.

[0022] When the pulley 103-4 is not used, the tip of the lift shaft 105-1 is connected to the other end 102b of the cable 102 fixed to the upper frame 101-2 in FIG.

[0023] The weight stack 104 has a structure in which multiple weight plates are stacked, and the user can adjust the load by replacing the pin P. The weight stack 104 has multiple weight plates aligned vertically. The lift shaft 105-1 is located in the center of the weight stack 104 and generates training load by rising and falling. The left guide shaft 105-2 and the right guide shaft 105-3 are located at both ends of the weight stack 104, respectively, and complement the lift shaft 105-1 to maintain the overall balance and stability of the weight stack 104.

[0024] The resistance control unit 1 is located directly below the weight stack 104. This location allows the resistance control unit 1 to sense the movement of the weight stack 104 in real time and provide accurate resistance adjustments.

[0025] The load control unit 1 is also designed to be easily retrofitted to training equipment already installed in training facilities. This design allows users to improve the functionality of currently used training equipment without having to completely replace existing facilities. Furthermore, the load control unit 1 is compatible with a variety of training equipment and is cost-effective because it requires no special modifications or additional parts for installation and use. Furthermore, the load control unit 1 is designed to be highly durable and withstand long-term use, allowing it to be easily incorporated into existing training equipment and improve the quality of training.

[0026] Furthermore, the load control unit 1 has a novel configuration that allows for long-term stability and accurate positioning after retrofitting to training equipment. This novel configuration makes the load control unit 1 easy to install and increases compatibility with existing training equipment. Furthermore, the stability of the load control unit 1 is maintained even with long-term use, ensuring consistency in training effects. Furthermore, this configuration allows the load control unit 1 to maintain its precise position, resulting in accurate responses to load and movement during training, allowing users to continue safe and effective training.

[0027] Furthermore, the load control unit 1 may be placed on training equipment before it is installed in a training facility, and may also be applied to newly introduced training equipment.

[0028] (Configuration of Load Control Unit) FIG. 2 is a cross-sectional view of the load control unit 1 as seen from the left side in the left-right direction, showing a cross section along line AA in FIG.

[0029] As shown in FIG. 2, the load control unit 1 includes a reel 11 having a rotating shaft member 11 a , a cable 12 connected to the lift shaft 105 - 1 , a magnetorheological fluid device 14 , and a control device 15 .

[0030] The reel 11 is rotatable around a rotary shaft member 11a as a rotary shaft. A cable 12 is wound around the reel 11, and the cable 12 can be pulled out from the reel 11 as needed.

[0031] Specifically, since the cable 12 is connected to the lift shaft 105-1, when the lift shaft 105-1 rises, the cable 12 is pulled out from the reel 11. Conversely, when the lift shaft 105-1 descends, the cable 12 is wound onto the reel 11. The reel 11 is provided with a spiral spring (not shown) for maintaining an appropriate tension. The spiral spring is disposed on the rotating shaft member 11a of the reel 11, and maintains an appropriate tension when the cable 12 is wound up and pulled out, preventing the cable 12 from sagging. This operation allows the cable 12 to be appropriately managed according to the position of the lift shaft 105-1 in the vertical direction.

[0032] The magnetorheological fluid device 14 contains a magnetorheological fluid whose viscosity changes depending on the strength of a magnetic field. The magnetorheological fluid device 14 applies a braking force to the rotating shaft member 11a by changing the viscosity of the magnetorheological fluid. Specifically, the magnetorheological fluid device 14 has a rotor to which the rotating shaft member 11a is fixed and a coil that applies a magnetic field to the rotor. A magnetic field is generated by passing a current through the coil. This magnetic field changes the viscosity of the magnetorheological fluid. The change in viscosity of the magnetorheological fluid applies a braking force that impedes rotation of the rotor, i.e., rotation of the rotating shaft member 11a. Impeding rotation of the rotating shaft member 11a impedes rotation of the reel 11.

[0033] The control device 15 adjusts the strength of the magnetic field, thereby changing the viscosity of the magnetorheological fluid in the magnetorheological fluid device 14, and thereby adjusting the braking force on the rotating shaft member 11 a in real time. The control device 15 may be, for example, a semiconductor substrate equipped with a microcontroller.

[0034] As described above, the load control unit 1 has a load control mechanism made up of the reel 11, the cable 12, the magnetorheological fluid device 14, and the control device 15, and this mechanism enables precise load adjustment.

[0035] The load control unit 1 also includes a unit case 17 that houses a load control mechanism composed of the reel 11, the cable 12, the magnetorheological fluid device 14, and the control device 15. The load control unit 1 also includes a protective case 18 that houses and protects the control device 15.

[0036] The unit case 17 integrally houses the reel 11 and the magnetorheological fluid device 14, thereby protecting these components from the external environment and protecting them from physical damage and dirt. This extends the life of these components and makes maintenance easier. The unit case 17 also improves the stability of the entire system by fixing these components in place.

[0037] The protective case 18 houses the control device 15 and protects it from external shocks and vibrations. This reduces the risk of failure of the control device 15 and improves the reliability of the system. The protective case 18 may also house a power supply device for driving the control device 15. This protects the power supply device and the control device 15 together, and also prevents damage or failure of the power supply device.

[0038] The unit case 17 and the protective case 18 can be combined into one unit, allowing the load control unit 1 to be housed in a single case. This integration simplifies the overall structure, making it easier to install on the training apparatus 100 and to handle the load control unit 1. The integrated case also improves the durability of the entire load control unit 1, allowing it to maintain stable performance over an extended period of time. Hereinafter, the integrated unit case 17 and protective case 18 will be collectively referred to as the "unit case 17."

[0039] Furthermore, a joint 12b is provided at the tip 12a of the cable 12 for connecting the tip 12a to the lift shaft 105-1. The tip 12a of the cable 12 is tied to the lower part of the joint 12b. The upper part of the joint 12b is inserted into and fixed to a hole provided in the lower end 105-1a of the lift shaft 105-1. For example, a screw thread may be formed at the upper part of the joint 12b (the joint 12b may have a screw such as a screw thread), and the joint 12b may be fixed by screwing the screw into a hole provided in the lower end 105-1a.

[0040] By tying the tip 12a of the cable 12 to the bottom of the joint 12b, the connection between the cable 12 and the joint 12b is strengthened, preventing the connection from coming loose during use. In addition, a screw thread is formed on the top of the joint 12b, and the structure allows it to be screwed onto the lift shaft 105-1 and fixed, making it easy to attach and detach. This makes it easy to maintain and replace parts of the load control unit 1, and simplifies maintenance of the load control unit 1.

[0041] As described above, joint 12b has a structure that allows tip 12a of cable 12 to be securely attached to lift shaft 105-1. Joint 12b also allows tip 12a of cable 12 to be easily detached from lift shaft 105-1 as needed. Therefore, joint 12b functions as an attachment tool that allows cable 12 to be attached to and detached from lift shaft 105-1.

[0042] However, in this embodiment, the attachment device is not limited to the use of the joint 12b. For example, a carabiner may be attached to the tip 12a of the cable 12. A carabiner is a metal ring-shaped device typically used in mountaineering and rock climbing, and is highly strong and reliable. By using a carabiner, the tip 12a of the cable 12 can be quickly and reliably attached to the lift shaft 105-1. In addition, the carabiner has an openable gate, making it easy to attach and detach the cable 12.

[0043] Furthermore, the attachment device is not limited to the joint 12b or the carabiner. In short, any device can be used as long as it can securely attach the tip 12a of the cable 12 to the lift shaft 105-1. Therefore, the attachment device can be flexibly selected according to the needs of the user and the structure of the training device 100.

[0044] (Function of Load Control Unit) The function of the load control unit 1 will be described with reference to Figures 1 and 2. A user of the training device 100 selects multiple weights from the weight stack 104 to determine the total weight to be lifted. When the user grips the handle (not shown) of the training device 100 with both hands and performs a training motion, the lift shaft 105-1 rises, and the selected weight also rises accordingly. The distance the weight moves from its lowest position to its highest position in this manner is called a "stroke."

[0045] When the user starts a training motion, the lift shaft 105-1 rises, and the cable 12 connected to its lower end rises as well. At this time, the cable 12 is pulled out from the reel 11. When the cable 12 is pulled out from the reel 11, the rotating shaft member 11a of the reel 11 rotates. The control device 15 sends a command to the magnetorheological fluid device 14 based on the amount of rotation of the reel 11, and adjusts the strength of the magnetic field applied to the magnetorheological fluid. As a result, the magnetorheological fluid device 14 applies a braking force to the rotating shaft member 11a, generating an additional load.

[0046] (Outline of the procedure for installing the load control unit) Figure 3 is an explanatory diagram for explaining an outline of the procedure for installing the load control unit 1 in the training apparatus 100. The diagram indicated by reference numeral 1001 shows the state before the load control unit 1 is installed in the training apparatus 100. Note that the weight stack 104 has been omitted from the diagram indicated by reference numeral 1001 for ease of viewing. The diagram indicated by reference numeral 1002 shows the state after the load control unit 1 has been installed in the training apparatus 100.

[0047] The procedure for installing the load control unit 1 in the training apparatus 100 will now be described. Grooves 17a and 17b are provided in the unit case 17 of the load control unit 1. Grooves 17a and 17b are U-shaped in a plan view of the unit case 17 viewed from above and below, and open to the front side of the unit case 17. Grooves 17a and 17b correspond to the right guide shaft 105-3 and the left guide shaft 105-2, respectively.

[0048] First, bring the load control unit 1 close to the training apparatus 100 and align the grooves 17a and 17b of the unit case 17 with the right guide shaft 105-3 and left guide shaft 105-2. Then, move the unit case 17 further until the right guide shaft 105-3 and left guide shaft 105-2 are securely fitted into the corresponding grooves 17a and 17b, respectively. At this time, it is important that the unit case 17 is firmly fixed to the right guide shaft 105-3 and left guide shaft 105-2. By fitting the right guide shaft 105-3 and left guide shaft 105-2 into the grooves 17a and 17b, respectively, the right guide shaft 105-3 and left guide shaft 105-2 face the grooves 17a and 17b, respectively.

[0049] Next, joint 12b is tightened to lift shaft 105-1. Here, when installing unit case 17, it may be necessary to lift weight stack 104. In this case, it is necessary to remove as many weight plates as necessary from the weight stack 104. This is to ensure space for properly installing unit case 17. When unit case 17 is placed directly below weight stack 104, right guide shafts 105-3 and 105-2 are fitted into corresponding grooves 17a and 17b, respectively.

[0050] However, in this embodiment, it is not necessary to remove the weight plate. The user can install the unit case 17 without removing the weight plate. In order to ensure the same stroke before and after installing the unit case 17, it is preferable to remove the weight plate by the height of the unit case 17. On the other hand, if the weight plate is not removed, the stroke will be shortened by the height of the unit case 17.

[0051] Finally, the pins are inserted through holes in a flange 17c provided on the unit case 17 and into two holes 101-4h provided in the lower frame 101-4. The flanges 17c extend from the side of the unit case 17 in the same direction as the lower frame 101-4 extends. The flanges 17c are provided on both the left and right sides of the unit case 17, and the two holes 101-4h are provided in positions that correspond to the holes in the flanges 17c when the unit case 17 is placed directly below the weight stack 104. Note that only the right flange 17c is shown in FIG. 3.

[0052] This installation procedure ensures that the unit case 17 is securely fixed to the training device 100, allowing the load control unit 1 to operate stably.

[0053] (Joint) The load control unit 1 is designed to be retrofitted to an already installed training apparatus 100, and is therefore compatible with a variety of training apparatuses 100. For this reason, the joint 12b shown in Figure 2 is highly versatile. Details of this are described below.

[0054] The joint 12b of the load control unit 1 is designed to be adjustable so that it can function reliably with different training apparatus 100. Specifically, as shown in Fig. 2, the diameter R2 of the joint 12b in a cross-sectional view is set to match the diameter R1 of the lower end 105-1a of the lift shaft 105-1. This allows the joint 12b to fit properly and be firmly fixed to the lower end 105-1a.

[0055] The joint 12b can be set to different sizes to accommodate various lift shaft diameters. For example, even if the diameter R1 of the lift shaft 105-1 is different, secure fixation can be achieved by selecting a joint 12b with a corresponding diameter R2.

[0056] Because the joint 12b has the versatility described above, the load control unit 1 can be retrofitted to a variety of training equipment 100, thereby improving the functionality of the training equipment 100 without having to completely replace the existing equipment.

[0057] (Flange and Pin) FIG. 4 is an enlarged view of the portion indicated by the reference symbol A in the diagram indicated by the reference symbol 1002 in FIG. 3, and is a cross-sectional view of the flange 17c, the pin 200, and the lower frame 101-4 in the front-rear direction.

[0058] The pin 200 is inserted into the hole 101-4h provided in the lower frame 101-4 through the hole 17h in the flange 17c provided in the unit case 17. A ball 201 protruding in the left-right direction is provided at the tip 200a of the pin 200, and when the pin 200 passes through the hole 101-4h provided in the lower frame 101-4, more specifically, when it passes through the surface 101-4a of the lower frame 101-4, the ball 201 is pushed into the tip 200a. The pin 200 continues to be inserted in this state, and when the pin 200 reaches the hollow portion 101-4b in the lower frame 101-4, the ball 201 protrudes again, and the pin 200 is securely fixed.

[0059] A spring 202 is disposed between the head portion 203 of the pin 200 and the flange 17c. The tension of the spring 202 applies an upward force to the head portion 203 of the pin 200, but the ball 201 provided at the tip 200a of the pin 200 pops out, preventing the head portion 203 from moving upward. As a result, the tension of the spring 202 presses the flange 17c downward. This force firmly fixes the flange 17c to the lower frame 101-4. Because the flange 17c is pressed against the lower frame 101-4, the unit case 17 is securely fixed to the lower frame 101-4.

[0060] The pins 200 are available in different diameters to accommodate various frame shapes and sizes of the training device 100. This allows the pins 200 to correspond to the hole diameters of various frames and fit appropriately.

[0061] However, this embodiment is not limited to using the pin 200 and the flange 17c. For example, other fixing devices can be used. Possible fixing devices include a screw-type bolt and a clamp that clamps the lower frame 101-4. The screw-type bolt provides strong fixation by being screwed into the lower frame 101-4 and is highly reliable. The clamp fixes the lower frame 101-4 by clamping it, allowing for a firm fixation.

[0062] In short, any fixing device can be used as long as it can securely fix the unit case 17 to the lower frame 101-4. Therefore, the fixing device can be flexibly selected by comprehensively considering the ease of installation, the structure of the training device 100, ease of maintenance, etc.

[0063] (Grooves of the Unit Case) The diagram designated by reference numeral 2001 in Fig. 5 is a schematic diagram showing the general configuration of the unit case 17 shown in Fig. 1, and is a cross-sectional view seen from the top and bottom. The pitch Y between the grooves 17a and 17b of the unit case 17 is designed to match the pitch X between the right guide shaft 105-3 and the left guide shaft 105-2. This design makes it possible for the unit case 17 to accommodate different pitches between the guide shafts of various training devices, making it versatile.

[0064] Here, the right guide shaft 105-3 and the left guide shaft 105-2 have the same diameter when viewed in vertical cross section. However, "same" does not necessarily mean that they are completely the same, and there is no problem if they are substantially the same in terms of guiding the weight stack 104 of the training device 100.

[0065] The cross-sectional shape of groove 17a is U-shaped and open on the front side. Specifically, it is made up of a straight line 17a-1 extending from the opening side toward the rear, a bottom 17a-2 continuing from straight line 17a-1, and a straight line 17a-3 continuing from bottom 17a-2 and extending toward the opening side. In other words, the cross-sectional shape of groove 17a is made up of two parallel straight lines 17a-1 and 17a-3 extending from the opening side of groove 17a toward bottom 17a-2, and bottoms 17a-2 continuing at the ends of straight lines 17a-1 and 17a-3.

[0066] The shape of the bottom 17a-2 of the groove 17a is semicircular to match the cross-sectional shape of the right guide shaft 105-3. This semicircular bottom 17a-2 allows the right guide shaft 105-3 to be firmly fitted into the groove 17a and fixed in a stable state.

[0067] The shape of the groove 17b is the same as that of the groove 17a, and therefore a detailed description thereof will be omitted.

[0068] When attaching the load control unit 1 to the training apparatus 100, the right guide shaft 105-3 is introduced along the gap between the two parallel lines 17a-1 and 17a-3 of the groove 17a toward the bottom 17a-2 and is securely fixed at the bottom 17a-2. Similarly, the left guide shaft 105-2 is introduced along the gap between the two parallel lines 17a-1 and 17a-3 of the groove 17b toward the bottom of the groove 17b and is securely fixed at the bottom.

[0069] This fixation allows the unit case 17 to obtain stable support for the right guide shaft 105-3 and the left guide shaft 105-2.

[0070] However, this embodiment is not limited to a configuration in which both groove 17a and groove 17b have cross-sectional shapes that allow the corresponding right guide shaft 105-3 and left guide shaft 105-2 to be securely fitted in. Specifically, while one of groove 17a and groove 17b has a shape that allows the corresponding guide shaft to be securely fitted in, the other groove may have a shape that only serves the function of receiving the guide shaft into the unit case. In this case, the receiving groove does not necessarily need to firmly fit the guide shaft, as long as it has a shape that assists in positioning and stabilizing the guide shaft.

[0071] As a specific example, the diagram designated by reference numeral 2002 in Fig. 5 is a cross-sectional view of a unit case 27, which is a modified example of the unit case 17 shown in the diagram designated by reference numeral 2001, as viewed from above. Grooves 27a and 27b that open to the front are formed in the unit case 27. Groove 27a has the same shape as groove 17a of unit case 17. The distance between the two straight lines of groove 27a and the diameter of the right guide shaft 105-3 are both m1.

[0072] On the other hand, groove 27b has a different shape from groove 17b of unit case 17. Specifically, the cross-sectional shape of groove 27b is U-shaped and open to the front. It is made up of a straight line 27b-1 extending from the opening side of groove 27b toward the rear, a bottom 27b-2 continuing from straight line 27b-1, and a straight line 27b-3 continuing from bottom 27b-2 and extending toward the opening side. In other words, the cross-sectional shape of groove 27b is made up of two parallel straight lines 27b-1 and 27b-3 extending from the opening side of groove 27b toward bottom 27b-2, and bottom 27b-2 continuing at each end of straight lines 27b-1 and 27b-3.

[0073] Furthermore, the distance m3 between the two straight lines 27b-1 and 27b-3 is the diameter m1 of the left guide shaft 105-2 plus a margin m2 on each side. Therefore, while the groove 27b can reliably receive the left guide shaft 105-2, the left guide shaft 105-2 is not fitted into it and its position is not reliably fixed. The bottom 27b-2 is a straight line that contacts the left guide shaft 105-2 and plays an auxiliary role in stabilizing the position of 105-2.

[0074] In this way, groove 27a is structured to reliably fit right guide shaft 105-3, and groove 27b is structured to receive left guide shaft 105-2, thereby facilitating installation and removal of unit case 27 and improving maintainability. Furthermore, this configuration allows unit case 27 to flexibly accommodate the specifications of various training equipment, making it versatile.

[0075] Furthermore, the shapes of the grooves 17a and 17b of the unit case 17 are not limited to those shown in Fig. 5. For example, the view indicated by reference numeral 3001 in Fig. 6 is a cross-sectional view, viewed from the top and bottom, of a unit case 37, which is a modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 37a and 37b that open to the front side are formed in the unit case 37. Both the grooves 37a and 37b open to the front side, have oblique straight lines that extend in the front-to-rear direction, and are connected at the bottom.

[0076] The view indicated by reference numeral 3002 in Fig. 6 is a cross-sectional view, viewed from the top and bottom, of a unit case 47, which is another modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 47a and 47b that open to the front side are formed in the unit case 47. The grooves 47a and 47b open to the front side and are composed of straight lines that extend obliquely in the front-to-rear direction and curved portions at the bottom.

[0077] The view indicated by reference numeral 3003 in Fig. 6 is a cross-sectional view, viewed from the top and bottom, of a unit case 57, which is yet another modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 57a and 57b that open to the front side are formed in the unit case 57. The grooves 57a and 57b open to the front side and have a straight line that extends obliquely in the front-to-back direction and a straight line that extends in the left-to-right direction at the bottom.

[0078] The view indicated by reference numeral 3004 in Fig. 6 is a cross-sectional view, viewed from above, of a unit case 67, which is yet another modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 67a and 67b that open to the front side are formed in the unit case 67. The grooves 67a and 67b open to the front side and are composed of straight lines that extend vertically in the front-to-rear direction and rectangular bottoms.

[0079] The view indicated by reference numeral 3005 in Fig. 6 is a cross-sectional view, viewed from above and below, of a unit case 77, which is yet another modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 77a and 77b that open to the front side are formed in the unit case 77. The grooves 77a and 77b open to the front side and have a shape in which obliquely extending straight lines join at a slightly sharp point at the bottom.

[0080] The view indicated by reference numeral 3006 in Fig. 6 is a cross-sectional view, viewed from the top and bottom, of a unit case 87, which is yet another modified example of the unit case 17 shown in the view indicated by reference numeral 2001 in Fig. 5. Grooves 87a and 87b that open to the front side are formed in the unit case 87. The grooves 87a and 87b are acutely V-shaped, with straight lines that extend at an angle in the front-to-rear direction intersecting sharply.

[0081] However, the shape of the grooves may be any shape as long as they fulfill the functions of grooves 17a, 17b, 27a, and 27b. For example, it is important that the guide shafts are reliably received and properly fixed as needed, and therefore grooves of various shapes may be designed for this purpose. This allows the unit case to flexibly accommodate the specifications of different training equipment. This flexibility allows the load control unit 1 to be applied to a variety of training equipment, improving versatility and practicality.

[0082] (Scope of Application of the Present Embodiment) The present embodiment is not limited to the weight stack type, but can also be applied to other training equipment. For example, it can be attached to machines other than the weight stack type, such as a plate loading machine.

[0083] Furthermore, this embodiment is not limited to the use of two guide shafts, and can be applied to any shaft equivalent to a guide shaft. For example, it can be applied to a training device with one shaft or three or more shafts. Furthermore, it can be applied to a machine that does not have a shaft that can be called a guide shaft.

[0084] The number, arrangement, and shape of the guide shafts are not limited to a specific structure, so it can be used with a variety of training equipment with one, two, or three or more shafts. The guide shafts can also be arranged in a variety of ways, such as vertically or diagonally, allowing for a high degree of design freedom. This allows the load control unit 1 to flexibly accommodate the specifications of different training equipment.

[0085] [Summary] The load control unit according to aspect 1 of the present invention is a load control unit that is retrofitted to training equipment, the training equipment having two guide shafts arranged at either end of the weight stack to align the weight stack vertically, a lift shaft that passes vertically through the weight stack to raise and lower the weight stack in the vertical direction, and a rectangular frame arranged to surround the weight stack, a load control mechanism including a cable with an attachment device at its end that can be attached to the lift shaft, a unit case that houses the load control mechanism, and two opposing grooves that are provided in the unit case to face each of the two guide shafts when the load control unit is retrofitted to the training equipment, at least one of which is fitted with the opposing guide shaft, and a fixing device that is provided in the unit case to face a lower frame that constitutes the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

[0086] According to the above configuration, the guide shaft that guides the weight stack of the training equipment fits into at least one groove formed in the unit case, and furthermore, a fixing device provided on the unit case is fixed to the frame that supports the weight stack. This provides a novel configuration that takes into consideration the long-term stability and accurate positioning of a device that can be retrofitted to existing training equipment.

[0087] The load control unit of aspect 2 of the present invention is the same as aspect 1 above, in that each of the two grooves opens to the guide shaft side of the unit case in a cross-sectional view of the unit case from the vertical direction, and has a bottom that contacts the introduced guide shaft.

[0088] With the above configuration, when attaching the resistance control unit to the training equipment, the guide shaft is inserted into the groove opening at the front of the unit case and positioned by contacting the bottom of the groove. The guide shaft remains stable within the groove, ensuring accurate and reliable attachment of the resistance control unit. Furthermore, the shape of the groove properly maintains the position of the guide shaft, ensuring stability even during long-term use.

[0089] The load control unit of aspect 3 of the present invention is the same as that of aspect 1 above, in that each of the two grooves, when viewed in cross section from the vertical direction, is composed of two parallel straight lines extending from the opening side of each groove toward the bottom side, and a bottom portion continuous with each end of the two straight lines.

[0090] According to the above configuration, the guide shaft moves stably along two parallel straight lines in a cross-sectional view, and reliably contacts the bottom of the groove.

[0091] A load control unit according to a fourth aspect of the present invention is the load control unit of the third aspect, wherein the bottom portion is semicircular in a cross section of each of the two grooves viewed from the vertical direction.

[0092] According to the above configuration, the bottom of the groove is semicircular in cross section to match the shape of the guide shaft, so the guide shaft is securely fixed to the bottom. This semicircular bottom securely holds the guide shaft within the groove and prevents it from moving or shifting. This ensures accurate and reliable installation of the resistance control unit, improving the long-term stability and reliability of the training device. Furthermore, this structure minimizes misalignment and vibration of the guide shaft during training.

[0093] A load control unit according to aspect 5 of the present invention is, in the above-mentioned aspect 1, such that the fixing device has a flange extending from the side of the unit case in the direction in which the lower frame extends, and a pin passing through a hole in the flange, and the lower frame has a hole in a position corresponding to the hole in the flange, and the pin is inserted through the hole in the flange and the hole in the lower frame to fix the unit case to the lower frame.

[0094] According to the above configuration, the pin passes through the hole in the flange on the unit case and is inserted into the hole in the lower frame, thereby reliably fixing the unit case to the lower frame. This stabilizes the position of the unit case and prevents it from shifting during training. Furthermore, the combination of the flange and pin makes it easy to remove and reinstall the unit case, improving maintainability.

[0095] A sixth aspect of the present invention provides a load control unit according to the first aspect, wherein the fixing device is a clamp, and the clamp clamps the lower frame to fix the unit case to the lower frame.

[0096] According to the above configuration, the clamps on the unit case clamp the frame, thereby reliably fixing the unit case. This stabilizes the position of the unit case and prevents it from shifting during training. Furthermore, the use of clamps makes it easy to remove and reattach the unit case, improving maintainability.

[0097] A load control unit according to aspect 7 of the present invention is the same as that according to aspect 1 above, in which the mounting device is a joint equipped with a screw, and the joint tightens the screw into a threaded hole provided in the lift shaft to connect the cable to the lift shaft.

[0098] According to the above configuration, the cable and the lift shaft are connected via the joint by tightening the screw of the joint to the lift shaft. This connection makes the connection between the cable and the lift shaft strong, and the cable is smoothly pulled out as the lift shaft rises. This action allows for appropriate load control and maximizes the effectiveness of training.

[0099] A load control unit according to aspect 8 of the present invention is a load control unit that is retrofitted to training equipment, the training equipment having a guide shaft arranged on the weight stack to align the weight stack vertically, a lift shaft that passes vertically through the weight stack to raise and lower the weight stack vertically, and a rectangular frame arranged to surround the weight stack, a load control mechanism including a cable with an attachment device at its tip that can be attached to the lift shaft, a unit case that houses the load control mechanism, grooves provided in the unit case so as to face the guide shafts when the load control unit is retrofitted to the training equipment, the grooves into which the opposing guide shafts are fitted, and a fixing device provided in the unit case so as to face a lower frame that constitutes the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

[0100] According to the above configuration, the same effects as those of the first aspect can be achieved.

[0101] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

[0102] 1 Load control unit 12 Cable 12a Tip 12b Joint 17, 27, 37, 47, 57, 67, 77, 87 Unit case 17c Flange 100 Training equipment 101 Frame 101-4 Lower frame 104 Weight stack 105-1 Lift shaft 105-2 Left guide shaft 105-3 Right guide shaft 200 Pin

Claims

1. A load control unit that is retrofitted to training equipment, the training equipment having two guide shafts arranged on either end of the weight stack to align the weight stack vertically, a lift shaft that passes vertically through the weight stack to raise and lower the weight stack in the vertical direction, and a rectangular frame arranged to surround the weight stack; a load control mechanism including a cable with an attachment device at its tip that can be attached to the lift shaft; a unit case that houses the load control mechanism; two opposing grooves that are provided in the unit case to face each of the two guide shafts when the load control unit is retrofitted to the training equipment, at least one of which is fitted with the opposing guide shaft; and a fixing device that is provided in the unit case to face a lower frame that forms the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

2. A load control unit as described in claim 1, wherein each of the two grooves, in a cross-sectional view of the unit case seen from the vertical direction, opens to the guide shaft side of the unit case and has a bottom that contacts the guide shaft when inserted.

3. A load control unit as described in claim 1, wherein each of the two grooves, when viewed in cross section from the vertical direction, is composed of two parallel straight lines extending from the opening side of each groove toward the bottom side, and a bottom portion continuous with each end of the two straight lines.

4. The load control unit according to claim 3, wherein the bottom portion is semicircular in a cross section of each of the two grooves viewed from the vertical direction.

5. A load control unit as described in claim 1, wherein the fixing device has a flange extending from the side of the unit case in the direction in which the lower frame extends, and a pin passing through a hole in the flange, the lower frame has a hole in a position corresponding to the hole in the flange, and the pin is inserted through the hole in the flange and the hole in the lower frame to fix the unit case to the lower frame.

6. The load control unit according to claim 1, wherein the fixing device is a clamp, and the clamp clamps the lower frame to fix the unit case to the lower frame.

7. The load control unit according to claim 1, wherein the mounting device is a joint with a screw, and the joint fastens the screw into a threaded hole provided in the lift shaft to connect the cable to the lift shaft.

8. A load control unit to be retrofitted to training equipment, the training equipment having a guide shaft arranged on the weight stack to align the weight stack in the vertical direction, a lift shaft that passes vertically through the weight stack to raise and lower the weight stack in the vertical direction, and a rectangular frame arranged to surround the weight stack; a load control mechanism including a cable with an attachment device at its tip that can be attached to the lift shaft; a unit case that houses the load control mechanism; grooves provided in the unit case to face the guide shafts when the load control unit is retrofitted to the training equipment, the grooves into which the opposing guide shafts are fitted; and a fixing device provided in the unit case to face a lower frame that constitutes the lower part of the rectangular frame when the load control unit is retrofitted to the training equipment, for fixing the unit case to the lower frame.

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