Fan blade resistance adjustment method

Abstract

This invention provides a method for adjusting the resistance of a fan blade, comprising: fixing a fan blade seat on a rotating shaft; slidably fitting a sliding seat onto the rotating shaft, and arranging a plurality of fan blades together around the rotating shaft; driving the rotating shaft to rotate by an external force, causing the fan blades to rotate synchronously around the rotating shaft in a fluid, thereby obtaining a rotational resistance; driving the sliding seat to move upward in an axis by an adjusting force, causing the fan blades to swing about a pivot end as a fulcrum, changing an opening angle between the fan blades and the rotating shaft, so that a radius of rotation of the fan blades changes with the opening angle, thereby changing the magnitude of the rotational resistance. In this way, the rotational resistance can be adjusted steplessly according to the degree of opening of the fan blades.

Description

Technical Field

[0001] This invention relates to a method for adjusting the resistance of fan blades, and more particularly to a method for adjusting the resistance of fan blades in fitness equipment. Background Technology

[0002] Rowing machines are a common type of fitness equipment. They typically use a combination of fan blades and a pull rope. When the operator pulls the rope, the pull rope drives the fan blades to rotate, which in turn causes the fan blades to beat against fluids such as air or water, thus providing resistance.

[0003] For example, Chinese Patent Publication No. CN217448885U provides a water paddle structure and a water tank for a rowing machine. This water paddle structure includes paddle blades and a shaft body that drives the paddle blades to rotate synchronously. A paddle blade angle adjustment mechanism is provided between each paddle blade and the shaft body. This mechanism changes the water resistance when the paddle blades rotate synchronously by adjusting the angle of each paddle blade.

[0004] Taiwan Patent Publication No. TWM594479 discloses a water resistance rowing exercise device, which includes a frame, water resistance device, fan blades, a strap, and a seat. The fan blades in the aforementioned patent can be added along the spindle to increase resistance. Furthermore, as long as the length of the water tank does not exceed the length of the seat post, increasing the number of fan blades avoids increasing the overall width to increase resistance, thus achieving the effect of increasing resistance without increasing the space occupied.

[0005] Regarding the adjustment of resistance, the aforementioned patent CN217448885U adjusts the tilt angle of the fan blades, while the aforementioned Taiwan patent TWM594479 adjusts the number of fan blades. Neither patent can adjust the degree of opening and closing of the fan blades, and the resistance adjustment of the two patents is relatively limited. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a method for adjusting the resistance of a fan blade.

[0007] This invention provides a method for adjusting the resistance of a fan blade, characterized by comprising:

[0008] A blade holder is fixed on a rotating shaft extending along an axis, so that the blade holder rotates with the rotation of the shaft;

[0009] A sliding seat is slidably fitted on the rotating shaft along the axial direction, and a plurality of fan blades are arranged around the rotating shaft, such that a pivot end of each fan blade is pivotally connected to the fan blade seat, and a pivot part of each fan blade is pivotally connected to the sliding seat via a plurality of connecting members.

[0010] An external force drives the shaft to rotate, causing the fan blades to rotate synchronously around the shaft in a fluid, thereby generating rotational resistance.

[0011] The sliding seat is driven to move upward in the axis by an adjustment force, and the fan blade swings with the pivot end as the fulcrum, changing the opening and closing angle between a baseline of the fan blade and an axis of the rotating shaft, so that the rotation radius of the fan blade changes with the opening and closing angle, thereby changing the magnitude of the rotational resistance.

[0012] The radius of rotation is the vertical distance from the outermost edge of the free end of the fan blade away from the pivot end to the axis on the baseline, and each fan blade extends along the baseline between the pivot end and the free end.

[0013] Furthermore, each blade includes a blade and a blade connector. The blade is fixed to one end of the blade connector, and the other end of the blade connector is pivotally connected to the blade seat. The pivot is located on the blade connector.

[0014] Furthermore, the pivot portion is a first through hole, each connector has a second through hole, and a plurality of screws pass through the first through hole and the second through hole respectively to pivot each connector to the pivot portion, and the diameter of the second through hole is substantially larger than the outer diameter of the screw.

[0015] The fluid is a gas.

[0016] Furthermore, there is a cover, in which the rotating shaft, the fan blade seat, the fan blade, and the sliding seat are all disposed, and the rotating shaft is rotatably fixed to the cover. The cover contains the fluid, which is a gas or a liquid.

[0017] The sliding seat extends out of the cover, and a cap is provided at the end of the sliding seat away from the fan blade seat. A bearing is provided between the cap and the sliding seat. The cover has a recessed receiving groove corresponding to the cap. When the sliding seat moves upward in the axial direction, the cap enters or leaves the receiving groove.

[0018] Furthermore, there is a force-applying component for receiving the external force, which is connected to the rotating shaft via a force-transmitting component to drive the rotating shaft to rotate, and an adjusting component for receiving the adjusting force, which is connected to the sliding seat via an adjusting component.

[0019] Furthermore, the adjustment transmission member has a plurality of connection points connected to the sliding seat, the connection points surrounding the rotating shaft, engaging a base frame of the rotating shaft, and having at least one through hole through which the adjustment transmission member passes.

[0020] Furthermore, an elastic element is disposed on the side of the sliding seat away from the fan blade seat. One end of the elastic element abuts against the base frame, and the other end of the elastic element abuts against the sliding seat. When the adjusting force drives the sliding seat away from the fan blade seat in the axial direction, the sliding seat and the base frame compress the elastic element, and the elastic element stores a first elastic potential energy. When the adjusting force is removed or applied in the opposite direction, the elastic element releases the first elastic potential energy, and the elastic element drives the sliding seat to move in the axial direction to reset or approach the fan blade seat.

[0021] Furthermore, the force transmission component is fixedly wound on a drum, and a spiral spring connects the drum and the shaft. When the external force drives the shaft to rotate via the force transmission component, the force transmission component causes the drum to twist the spiral spring, and the spiral spring stores a second elastic potential energy. When the external force is removed, the spiral spring releases the second elastic potential energy, and the spiral spring causes the drum to rotate relative to the shaft, thereby resetting the force transmission component.

[0022] Based on the above technical features, the following effects can be preferably achieved:

[0023] 1. By adjusting the sliding seat to move axially, the opening and closing degree of the fan blades can be adjusted, and the rotational resistance can be adjusted steplessly.

[0024] 2. In addition to being a combination of blades and blade connectors, fan blades can also be large-area blades to increase the contact area with the fluid.

[0025] 3. By using a second through hole with a diameter substantially larger than the outer diameter of the screw, the connector can move more smoothly when driving the fan blades to swing.

[0026] 4. The fluid can be gas, or it can be selected as gas or liquid after being fitted with a cover, depending on the application requirements.

[0027] 5. The cover is recessed with a receiving groove to provide sliding space for the sliding seat part, and the distance of the rotating shaft can be further shortened, thereby reducing the overall volume.

[0028] 6. The adjustment mechanism has multiple connection points to the sliding seat, which, together with the through holes on the base frame, makes the movement of the sliding seat more stable and smooth.

[0029] 7. The elastic element and the spiral spring can be used to assist in the reset of the sliding seat and the force transmission element, respectively, so as to facilitate the next operation. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating an embodiment of the present invention.

[0031] Figure 2 This is the three-dimensional appearance of the first embodiment of the present invention. Figure 1This illustrates the resistance adjustment mechanism of the fan blades.

[0032] Figure 3 This is a partially enlarged view of the first embodiment of the present invention.

[0033] Figure 4 This is a cross-sectional view of the first embodiment of the present invention. Figure 1 .

[0034] Figure 5 This is a partially exploded view of the first embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the first embodiment of the present invention. Figure 1 This indicates that the opening angle is 90 degrees.

[0036] Figure 7 This is a cross-sectional view of the first embodiment of the present invention. Figure 2 This indicates that when the opening angle is 90 degrees, the elastic element has not yet been compressed.

[0037] Figure 8 This is a schematic diagram of the first embodiment of the present invention. Figure 2 The opening angle is indicated as 45 degrees.

[0038] Figure 9 This is a cross-sectional view of the first embodiment of the present invention. Figure 3 This illustrates that when the opening angle is 45 degrees, the elastic element is compressed.

[0039] Figure 10 This is the three-dimensional appearance of the first embodiment of the present invention. Figure 2 This indicates fitness equipment.

[0040] Figure 11 This is a side view of the second embodiment of the present invention.

[0041] Figure reference numerals: 100: Fitness equipment; 1: Resistance adjustment structure of fan blades; 11: Rotating shaft; 12: Fan blade seat; 121: First notch; 122: First ring; 13, 13a: Fan blades; 131: Free end; 132: Pivot end; 133, 133a: Pivot part; 134, 134a: Blades; 135: Blade connector; 14: Sliding seat; 141: Cap body; 142: Second notch; 143: Second ring; 1 5, 15a: Connector; 151: Second through hole; 152: Threaded part; 16: Covering part; 161: Receiving groove; 17: Bearing; 2: Base frame; 21: Through hole; 3: Force application part; 4: Force transmission part; 5: Adjusting part; 6: Adjustment transmission part; 61: Connection point; 7: Vortex spring; 8: Drum; 9: Elastic part; A1, A2: Opening angle; D: Axial direction; L1: Axis; L2: Baseline; R1, R2: Rotation radius. Detailed Implementation

[0042] Based on the above technical features, the main effects of the fan blade resistance adjustment method of the present invention will be clearly demonstrated in the following embodiments.

[0043] Please see Figures 1 to 3 This discloses a resistance adjustment structure 1 for a single blade in the first embodiment, which can be configured as a fitness device 100, such as... Figure 10 As shown, the method for adjusting the resistance of a blade according to the present invention is implemented. In actual implementation, the fitness equipment 100 can be a rowing machine, rock climbing machine, pedal bike, or other equipment that requires resistance adjustment, and the present invention does not limit it.

[0044] The resistance adjustment mechanism 1 of the fan blade is disposed on a base frame 2 of the fitness equipment 100, and the resistance adjustment mechanism 1 of the fan blade includes:

[0045] A rotating shaft 11 extends along an axis D, and an axis L1 passes through the center of the rotating shaft 11 and extends along the axis D, as shown below. Figure 6 As shown.

[0046] A blade holder 12 is fixed to the rotating shaft 11, and the blade holder 12 can rotate with the rotation of the rotating shaft 11.

[0047] A plurality of fan blades 13 together surround the rotating shaft 11.

[0048] Please see Figures 3 to 6 Each blade 13 includes a free end 131 and a pivot end 132, the pivot end 132 being pivotally connected to the blade seat 12. Each blade 13 extends along a baseline L2 between the pivot end 132 and the free end 131, and each blade 13 has a pivot portion 133 between the pivot end 132 and the free end 131. Preferably, the pivot portion 133 is a first through hole.

[0049] Each blade 13 also includes a blade 134 and a blade connector 135. The blade 134 is fixed to one end of the blade connector 135, and the other end of the blade connector 135 is pivotally connected to the blade seat 12. The pivot part 133 is located on the blade connector 135.

[0050] A sliding seat 14 is slidably fitted onto the rotating shaft 11 along the axis D.

[0051] A plurality of connectors 15, one end of each connector 15 is pivotally connected to the sliding seat 14, and the other end of each connector 15 is pivotally connected to the pivot portion 133 corresponding to each fan blade 13.

[0052] Each connector 15 has a second through hole 151, and a plurality of screws 152 pass through the pivot portion 133 and the second through hole 151 respectively to pivot each connector 15 to the pivot portion 133. The diameter of the second through hole 151 is substantially larger than the outer diameter of the screw 152, so that the connector 15 can drive the fan blade 13 to swing more smoothly.

[0053] A cover 16 is provided in which the rotating shaft 11, the fan blade seat 12, the fan blade 13, and the sliding seat 14 are all disposed, and the rotating shaft 11 is rotatably fixed to the cover 16. The cover 16 contains a fluid, which is a gas or a liquid.

[0054] Preferably, the sliding seat 14 extends beyond the cover 16, and a cap 141 is provided at the end of the sliding seat 14 away from the blade seat 12. The cover 16 has a recessed receiving groove 161 corresponding to the cap 141. When the sliding seat 14 moves along the axial direction D, the cap 141 enters or leaves the receiving groove 161. Since the receiving groove 161 provides sliding space for part of the sliding seat 14, the required length of the rotating shaft 11 outside the cover 16 can be shortened, thereby reducing the overall volume.

[0055] In actual implementation, the covering 16 may be omitted, allowing the fluid to be a gas such as air, so that the user can choose according to actual needs.

[0056] Preferably, the friction problem exists between the pivot 11 and the base frame 2, between the cap 141 and the sliding seat 14, and even in parts of the fitness equipment 100 where friction is present [the fitness equipment 100 should be paired with...]. Figure 10 Each of the components can be provided with a bearing 17, so that when the rotating shaft 11 and the sliding seat 14 rotate, the base frame 2 and the cap body 141 will not rotate together, while the cap body 141 can move synchronously with the sliding seat 14 along the axis D via the bearing 17.

[0057] Please see Figure 2 , Figure 3 and Figure 10 In addition to the resistance adjustment structure 1 of the fan blade and the base frame 2, the fitness equipment 100 also includes:

[0058] A force-applying component 3 is movably attached to the base frame 2.

[0059] A force transmission component 4 is provided, one end of which is connected to the force application component 3, and the other end of which is connected to the rotating shaft 11 to drive the rotating shaft 11 to rotate.

[0060] An adjusting component 5 is connected to the sliding seat 14.

[0061] In a preferred embodiment of the present invention, the adjusting member 5 is connected to the sliding seat 14 via an adjusting transmission member 6, and the adjusting transmission member 6 has a plurality of connection points 61 connected to the sliding seat 14, the connection points 61 surrounding the rotating shaft 11, and the base frame 2 has at least one through hole 21 for the adjusting transmission member 6 to pass through.

[0062] More specifically, the adjustment transmission component 6 can be three steel cables, each connected to the sliding seat 14 at three connection points 61. The three steel cables are then combined into one and connected to the adjustment component 5. The adjustment component 5 can be a knob, or it can be a pin or other means to receive an adjustment force.

[0063] The force transmission component 4 is fixedly wound around a drum 8, and a spiral spring 7 connects the drum 8 and the shaft 11.

[0064] Please see Figure 5 In a preferred embodiment of the present invention, the pivoting method of the connector 15 is that the fan blade seat 12 is provided with a plurality of first notches 121 and a first ring 122, and the sliding seat 14 is provided with a plurality of second notches 142 and a second ring 143. The two ends of the connector 15 are respectively passed through the first ring 122 and the second ring 143, so that the connector 15 can pivot in the first notches 121 and the second notches 142. In actual implementation, it is not limited to this.

[0065] Please see Figure 4 In addition, an elastic element 9 is disposed on the side of the sliding seat 14 away from the fan blade seat 12. One end of the elastic element 9 abuts against the base frame 2, and the other end of the elastic element 9 abuts against the sliding seat 14.

[0066] Please see Figure 3 , Figure 6 and Figure 7 And please match Figure 1 To begin using this fitness equipment 100, please use [this fitness equipment 100 should be paired with...] Figure 10 First, the adjusting member 5 can be adjusted so that the sliding seat 14 is closest to the fan blade seat 12. At this time, the opening and closing angle A1 between the axis L1 and the reference line L2 is 90 degrees. In actual implementation, the opening and closing angle A1 can be set to 90 degrees when the adjusting member 5 has not yet received the adjusting force, by using the length of the elastic member 9.

[0067] If the vertical distance from the outermost edge of the free end 131 on the baseline L2 to the axis L1 is defined as a rotation radius R1, then when the opening angle A1 is 90 degrees, the fan blade 13 has the maximum rotation radius R1.

[0068] Please see Figure 2 , Figure 6 and Figure 7 And please match Figure 1 Taking a rowing machine as an example, the user holds the force-applying component 3 by extending their arm and applying an external force to pull the force-applying component 3 toward themselves. This external force will drive the rotating shaft 11 to rotate through the force-transmitting component 4, so that the fan blades 13 will rotate synchronously around the rotating shaft 11 in the fluid. The user will feel the greatest rotational resistance.

[0069] At this time, the force transmission component 4 drives the drum 8 to twist the spiral spring 7, and the spiral spring 7 stores a second elastic potential energy.

[0070] When the user bends their arm and pulls the force-applying component 3 as close to themselves as possible, they hold the force-applying component 3 and stop applying the external force. The spiral spring 7 releases the second elastic potential energy. The spiral spring 7 drives the drum 8 to rotate relative to the rotating shaft 11, thereby resetting the force transmission component 4. The force-applying component 3 will also be driven away from the user and reset by the force transmission component 4, allowing the user's arm to straighten again.

[0071] The user applies the external force again, pulling the force-applying component 3 towards the user, and then stops applying the external force. This process is repeated to simulate rowing training movements.

[0072] Please see Figure 3 , Figure 8 and Figure 9 And please match Figure 1 When users think Figure 6 When the rotational resistance is too high at the opening angle A1 of 90 degrees, the adjusting member 5 can be operated to apply the adjusting force to the adjusting transmission member 6.

[0073] If from Figure 6 When the opening angle A1 is 90 degrees, the adjustment force will drive the sliding seat 14 to move away from the fan blade seat 12 along the axis D. The sliding seat 14 will then drive the fan blade 13 via the connector 15, causing the fan blade 13 to swing toward the sliding seat 14 with the pivot end 132 as the fulcrum.

[0074] Since the adjustment transmission component 6 has multiple connection points 61 connected to the sliding seat 14, and in conjunction with the through holes 21 on the base frame 2, the movement of the sliding seat 14 can be more stable and smooth.

[0075] As the user operates the adjustment component 5, the opening angle A2 will gradually decrease. Figure 8 Taking an adjustment to 45 degrees as an example, the radius of rotation R2 will also decrease as the opening angle A2 decreases, thereby reducing the magnitude of the rotational resistance.

[0076] At this time, the sliding seat 14 and the base frame 2 together compress the elastic member 9, and the elastic member 9 stores a first elastic potential energy.

[0077] Once the user deems the rotational resistance appropriate, they can stop operating the adjusting component 5, allowing the sliding seat 14 to be positioned, and continue operating... Figure 2 The force-applying component 3 is used for training.

[0078] When the user believes that the rotational resistance is too small, the adjusting member 5 is rotated in the opposite direction, so that the adjusting force is applied in the opposite direction. The elastic member 9 gradually releases the first elastic potential energy, and the elastic member 9 drives the sliding seat 14 to approach the fan blade seat 12 in the axial direction D.

[0079] In practical implementation, the adjusting member 5 can also be equipped with a one-button release function. For example, by pressing the button, the adjusting transmission member 6 can be released directly, so that the elastic member 9 can fully release the first elastic potential energy and return to its original length, thereby causing the sliding seat 14 to directly reset to its original position. Figure 6 This is the state to prepare for the next operation.

[0080] Please see Figure 11 This discloses the resistance adjustment structure of the fan blade in the second embodiment, which differs from the first embodiment in that: in the first embodiment, only a small portion of the fan blade 13 near the free end 131 is the blade 134, such as... Figure 5 As shown; in this embodiment, the fan blade 13a is mostly the blade 134a, which can greatly increase the contact area with the fluid.

[0081] The pivot 133a is located on the blade 134a and can also be connected to the connector 15a, so that the connector 15a can drive the fan blade 13a to swing.

[0082] In this embodiment, the resistance adjustment structure of the fan blade, the configured fitness equipment, and the resistance adjustment method of the fan blade are all the same as those in the first embodiment, and will not be repeated here.

[0083] Please refer to the following: Figure 6 and Figure 8 By using the adjusting force to drive the sliding seat 14 to move along the axis D, the opening and closing angles A1 and A2 of the fan blade 13 can be adjusted steplessly, thereby adjusting the magnitude of the rotational resistance to meet the user's training needs.

[0084] Based on the above description of the embodiments, it should be fully understood that the operation, use and effects of the present invention are as follows. The above embodiments are only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Simple equivalent changes and modifications made according to the content of the present invention are all within the scope of the present invention.

Claims

1. A method for adjusting the resistance of a fan blade, characterized in that, Include: A blade holder is fixed on a rotating shaft extending along an axis, so that the blade holder rotates with the rotation of the shaft; A sliding seat is slidably fitted on the rotating shaft along the axial direction, and a plurality of fan blades are arranged around the rotating shaft, such that a pivot end of each fan blade is pivotally connected to the fan blade seat, and a pivot part of each fan blade is pivotally connected to the sliding seat via a plurality of connecting members. An external force drives the shaft to rotate, causing the fan blades to rotate synchronously around the shaft in a fluid, thereby generating rotational resistance. The sliding seat is driven to move upward in the axis by an adjustment force, and the fan blade swings with the pivot end as the fulcrum, changing the opening and closing angle between a baseline of the fan blade and an axis of the rotating shaft, so that the rotation radius of the fan blade changes with the opening and closing angle, thereby changing the magnitude of the rotational resistance. The radius of rotation is the vertical distance from the outermost edge of the free end of the fan blade away from the pivot end to the axis on the baseline, and each fan blade extends along the baseline between the pivot end and the free end.

2. The fan blade resistance adjustment method as described in claim 1, characterized in that: Each blade includes a blade and a blade connector. The blade is fixed to one end of the blade connector, and the other end of the blade connector is pivotally connected to the blade seat. The pivot is located on the blade connector.

3. The fan blade resistance adjustment method as described in claim 2, characterized in that: The pivot portion is a first through hole, each connector has a second through hole, and a plurality of screws pass through the first through hole and the second through hole respectively to pivot each connector to the pivot portion, and the diameter of the second through hole is larger than the outer diameter of the screw.

4. The fan blade resistance adjustment method as described in claim 1, characterized in that, The fluid is a gas.

5. The fan blade resistance adjustment method as described in claim 1, characterized in that: There is a cover, in which the rotating shaft, the blade seat, the blade, and the sliding seat are all disposed, and the rotating shaft is rotatably fixed to the cover. The cover contains the fluid, which is a gas or a liquid.

6. The fan blade resistance adjustment method as described in claim 5, characterized in that, The sliding seat extends out of the cover, and a cap is provided at the end of the sliding seat away from the fan blade seat. A bearing is provided between the cap and the sliding seat. The cover has a recessed receiving groove corresponding to the cap. When the sliding seat moves upward in the axial direction, the cap enters or leaves the receiving groove.

7. The method for adjusting the resistance of fan blades as described in claim 1, characterized in that: There is a force-applying component for receiving the external force, which is connected to the rotating shaft via a force-transmitting component to drive the rotating shaft to rotate, and an adjusting component for receiving the adjusting force, which is connected to the sliding seat via an adjusting component.

8. The method for adjusting the resistance of fan blades as described in claim 7, characterized in that: The adjustment transmission element has a plurality of connection points connected to the sliding seat, the connection points surrounding the pivot and engaging a base frame of the pivot, and having at least one through hole through which the adjustment transmission element passes.

9. The method for adjusting the resistance of fan blades as described in claim 8, characterized in that: An elastic element is disposed on the side of the sliding seat away from the fan blade seat. One end of the elastic element abuts against the base frame, and the other end of the elastic element abuts against the sliding seat. When the adjusting force drives the sliding seat away from the fan blade seat in the axial direction, the sliding seat and the base frame compress the elastic element, and the elastic element stores a first elastic potential energy. When the adjusting force is removed or applied in the opposite direction, the elastic element releases the first elastic potential energy, and the elastic element drives the sliding seat to move in the axial direction to reset or approach the fan blade seat.

10. The method for adjusting the resistance of fan blades as described in claim 7, characterized in that: The force transmission component is fixedly wound on a drum, and a spiral spring connects the drum and the shaft. When the external force drives the shaft to rotate via the force transmission component, the force transmission component causes the drum to twist the spiral spring, and the spiral spring stores a second elastic potential energy. When the external force is removed, the spiral spring releases the second elastic potential energy, and the spiral spring causes the drum to rotate relative to the shaft, thereby resetting the force transmission component.

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