EXERCISE EQUIPMENT WITH DUAL FANS FOR CHANGING FLUID RESISTANCE
The present invention is to provide an exercise equipment with dual fans for changing fluid resistance, which includes a housing, two fans and two driving members. The housing forms a receiving cavity therein for receiving fluid. Each fan includes a shaft pivotally provided at a central position of the housing and driven by a driven wheel and a plurality of vanes each fixedly provided on the periphery of the shaft and received in the receiving cavity. The driven wheels can drive the corresponding vanes to rotate about the corresponding shafts, thereby causing the fluid in the receiving cavity to form vortices. The driving members are movably provided outside the housing and connected with the corresponding driven wheels respectively by a link assembly. When the driving members are pushed or pulled, the link assemblies drive the corresponding driven wheels respectively and thereby drive the shafts to rotate with the driven wheels.
The present invention relates to an exercise equipment, more particularly to an exercise equipment with dual fans for changing fluid resistance, wherein fluid resistance is changed by convection caused by the two fans.
BACKGROUND OF THE INVENTIONNowadays, muscle training equipment is available in various forms. In addition to the commonly seen weight training apparatuses that employ weight disks, exercise equipment which uses fluid as a source of resistance has been designed and is now in wide use. The fluid resistance-based exercise equipment typically includes driving members such as handles or pedals for driving a single fan to rotate against the fluid in a sealed housing, and the intended exercising effect can be achieved by the user's trying to overcome the resistance of the fluid against the vanes of the fan.
However, the aforesaid exercise equipments have the following three shortcomings that tend to compromise training effect:
1. Low resistance: To prevent leaking, the fluid resistance-based exercise equipment only uses a small amount of fluid, so the resistance provided by the fluid is low. Moreover, as the vortex generated by the fluid flow spins in the same direction as the fan, the inertia of the fluid reduces the resistance applied to the fan. When the resistance is low, only a small number of muscle fibers in the user's active muscle groups are called upon to exert force; in other words, the training effect is poor.
2. Inappropriate intensity: The strength of human muscles varies greatly with the angles of joints across which the muscles span. For example, the strength of the biceps is about 1.4 times as high when the arm is bent at right angle as when the arm is straight. Nevertheless, due to gravity or inertia, the resistance provided by existing exercise equipment tends to decrease rather than increase as the user bends his or her arms to exert more force. Consequently, the user's active muscle groups are not effectively stimulated during exercise. One solution is to set the training intensity at a higher level, which, though effective in stimulating the active muscle groups, can be too stimulative or even harmful to straightened arms.
3. Overly simple motion: In order to activate the maximum number of motor units in the human body, increase energy consumption, and strengthen the brain's control over muscles, a reciprocating motion involving the user's alternate push and pull is typically used, in which the flexor and extensor muscle groups and the rotator muscle groups work in an alternate and coordinated fashion that increases the complexity of muscular movement. However, the fluid or weight disks of the conventional exercise equipment are subject to inertial movement such that, whenever the user stops moving or changes the direction of motion, eccentric muscle contraction takes place instantaneously. As eccentric contraction is correlated to muscle lacerations and muscle strains, the safety of the aforesaid reciprocating motion is not guaranteed, unless muscle groups are trained in one direction at a time. Nonetheless, eccentric contraction is inevitable when the weight disk-based equipment is used.
So far, the shortcomings stated above can only be overcome by using an electromechanical system to control the magnitude and direction of resistance of an exercise equipment. And yet exercise equipment having such electromechanical systems are affordable only to hospitals or research institutions, entail complex installations, are good for exercising one limb at a time, and hence can only serve as rehabilitation or testing equipment.
Therefore, the issue to be addressed by the present invention is to provide a non-electrically driven simple structure that can solve the aforementioned problems effectively.
BRIEF SUMMARY OF THE INVENTIONIn view of the unsatisfactory training effect of the conventional exercise equipment, the inventor of the present invention incorporated years of practical experience into repeated experiments and tests and finally succeeded in developing an exercise equipment with dual fans for changing fluid resistance, as an improvement over the existing exercise equipment in terms of both safety and training effect.
It is an object of the present invention to provide an exercise equipment with dual fans for changing fluid resistance, wherein fluid resistance is changed by convection caused by the two fans. The exercise equipment includes a housing, two fans, and two driving members. The housing forms a receiving cavity therein for receiving fluid (e.g., water). Each fan includes a shaft and a plurality of vanes. The vanes of each fan are fixedly provided on the periphery of the corresponding shaft and are received in the receiving cavity. The shafts are pivotally provided at a central position of the housing and are each provided with a driven wheel. The driven wheels can drive the corresponding vanes to rotate about rotation axes defined respectively by the corresponding shafts, thereby causing the fluid in the receiving cavity to form vortices. The driving members are movably provided outside the housing and can be pushed and pulled reciprocally outside the housing. Each driving member and the corresponding driven wheel are connected by a link assembly. When the driving members are pushed or pulled, the link assemblies drive the corresponding driven wheels respectively and thereby drive the shafts to rotate with the driven wheels.
It is another object of the present invention to provide the foregoing exercise equipment, wherein the exercise equipment is fixed at a specific location (e.g., on an exercise bench), and the driving members, when pushed or pulled by the user with both hands, cause the vanes to generate two opposing or separate vortices in the receiving cavity. As the speed of the vortices depends on the force applied by the user and in turn influences the resistance against vane rotation, the resistance increases with the force applied.
Yet another object of the present invention is to provide the foregoing exercise equipment, wherein the vortices generated by the vanes interact with each other and generate turbulent flows that interrupt inertial flow of the fluid. In addition, directional wheels are provided and configured in such a way that, whether the user pushes or pulls the driving members, the user's active muscles always undergo concentric contraction and are therefore prevented from damage which may otherwise result from eccentric muscle contraction. Further, should the user feel any discomfort or weakness at a certain joint angle, the user is free to stop the exercise or reduce the resistance as needed.
Still another object of the present invention is to provide the foregoing exercise equipment, wherein when the user is engaged in multi joint flexion and extension actions of both left and right limbs, the user's torso rotation muscle groups and stabilizing muscle groups are required to work in concert with the limbs. With the user's body being rotated during limb flexion and extension, a high degree of muscle contraction is achieved. Meanwhile, the instructions given by the user's brain to the muscles are more diversified and more complex than in an exercise which involves flexion and extension of a single muscle group on each side of the body (e.g., in a dumbbell bench press). Therefore, not only can coordination between different muscle groups be substantially improved, but also energy consumption is increased. Moreover, as the present invention uses the opposing vortices to counteract the inertia of the fluid, the aforesaid actions can be carried out in safety.
The structure as well as a preferred mode of use, further objects, and advantages of the present invention will be best understood by referring to the following detailed description of some illustrative embodiments in conjunction with the accompanying drawings, in which:
The present invention provides an exercise equipment with dual fans for changing fluid resistance. In a nutshell, the two fans are configured to disturb fluid and generate a plurality of vortices in the fluid so that a proper resistance against the fans is created by interaction between the vortices. Before the hardware structure of the exercise equipment is disclosed, the technical principle of the present invention is described with reference to
Referring to
Referring to
With reference to
Referring to
In addition to the foregoing configuration, the technical features of the present invention can be embodied by structural variants of the housing, the driving members, and the fans, installed at positions different from those described above. For example, the driving members can be provided to the left and right of the housing respectively. The components of the link assembly may also be modified, and the driven wheels may take other forms, so as to satisfy the needs of different types of exercise equipment. Referring to
The embodiments that follow are provided mainly to illustrate variations of the link assembly, in which components other than the link assembly remain substantially the same in terms of both structure and connection. Therefore, new reference numerals are given only to the link assemblies but not to the other components. Please refer to
As friction between racks and gears tends to produce noise, the foregoing racks can be replaced by cables. In the fourth embodiment of the present invention as shown in
According to the above, once the exercise equipment 3 of the present invention is fixed to an exercise bench 301 as shown in
Aside from the configurations described above, the housing and the vanes may take other shapes according to production needs. For example, in the fifth embodiment of the present invention as shown in
As shown in
Referring again to
The sixth embodiment of the present invention discloses yet another configuration of the link assembly, as shown in
As shown in
While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.
Claims
1. An exercise equipment with dual fans for changing fluid resistance, comprising:
- a housing formed therein with a receiving cavity for receiving fluid;
- two fans provided in the receiving cavity, each said fan comprising a shaft and a plurality of vanes, the vanes of each said fan being distributed around and fixed to a periphery of a corresponding said shaft and being adjacent to one of two opposite lateral sides of the housing, each said shaft being pivotally connected to a central position of one said lateral side of the housing and provided with a driven wheel, each said driven wheel being configured to drive a corresponding said shaft into rotation such that corresponding said vanes are rotated about a rotation axis defined by the shaft, thereby causing the fluid in the receiving cavity to form vortices; and
- two driving members movably provided outside the housing and configured to be pushed and pulled reciprocally outside the housing, there being a link assembly between each said driving member and a corresponding said driven wheel, the link assemblies being configured to drive the driven wheels respectively and thereby cause the shafts to rotate with the driven wheels respectively when the driving members are pushed or pulled.
2. The exercise equipment of claim 1, wherein each said link assembly comprises:
- an axle having a first end and a second end, wherein the first end is connected to a corresponding said driven wheel and configured to drive the driven wheel into rotation, and the second end passes through the housing and is exposed on the housing;
- a driving wheel connected to the second end of the axle and configured to drive the axle into rotation;
- a directional wheel unit connected to the driving wheel and configured to drive the driving wheel into rotation; and
- at least a cable wound around the directional wheel unit and connected to two opposite ends of a corresponding said driving member, wherein the at least a cable is displaced and thereby drives the directional wheel unit into rotation when the driving member is pushed or pulled.
3. The exercise equipment of claim 2, wherein each said directional wheel unit comprises:
- an upper directional wheel wound with a said cable and configured to drive a corresponding said driving wheel into rotation if and only if the upper directional wheel is rotated in a predetermined direction; and
- a lower directional wheel wound with another said cable and configured to drive the driving wheel into rotation if and only if the lower directional wheel is rotated in the predetermined direction.
4. The exercise equipment of claim 1, wherein each said link assembly comprises:
- at least a rack provided on a corresponding said driving member; and
- a driving wheel pivotally connected to the housing at a position adjacent to the driving member and a corresponding said driven wheel and meshing with the at least a rack and the driven wheel respectively, wherein the at least a rack is displaced and thereby drives the driving wheel and hence the driven wheel into rotation when the driving member is pushed or pulled.
5. The exercise equipment of claim 1, wherein each said link assembly comprises:
- at least a rack provided on a corresponding said driving member;
- a belt; and
- a driving wheel pivotally connected to the housing at a position adjacent to the driving member and a corresponding said driven wheel, meshing with the at least a rack, and connected to the driven wheel by the belt, wherein the at least a rack is displaced and thereby drives the driving wheel and hence the driven wheel into rotation when the driving member is pushed or pulled.
6. The exercise equipment of claim 1, wherein each said link assembly comprises:
- a roller installed on a corresponding said driven wheel and configured to drive the driven wheel into rotation; and
- at least a cable having a central section wound around a periphery of the roller and two ends fixed respectively to two ends of a corresponding said driving member, wherein the at least a cable is displaced and thereby drives the roller and hence the driven wheel into rotation when the driving member is pushed or pulled.
7. The exercise equipment of claim 1, wherein each said link assembly comprises:
- a roller installed on a corresponding said driven wheel and configured to drive the driven wheel into rotation; and
- two cables wound around a periphery of the roller, each said cable having an end fixed to the roller and an opposite end fixed to one of two opposite ends of a corresponding said driving member, wherein the cables are displaced and thereby rotate the roller and hence the driven wheel into rotation when the driving member is pushed or pulled.
8. The exercise equipment of claim 1, wherein each said link assembly comprises:
- a plurality of pulleys;
- a first cable provided on a corresponding said driving member and wound around each said pulley;
- a driving wheel around which the first cable is wound, wherein the first cable is displaced to drive each said pulley and thereby drive the driving wheel into rotation when the driving member is pushed or pulled; and
- a second cable wound around the driving wheel and a corresponding said driven wheel, wherein the second cable is displaced and thereby drives the driven wheel into rotation when the driving wheel is rotated.
9. The exercise equipment of claim 1, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
10. The exercise equipment of claim 2, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
11. The exercise equipment of claim 3, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
12. The exercise equipment of claim 4, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
13. The exercise equipment of claim 5, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
14. The exercise equipment of claim 6, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
15. The exercise equipment of claim 7, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
16. The exercise equipment of claim 8, wherein the housing is composed of two housing portions each having a lateral side concavely provided with a fluid action space, each said housing portion being provided therein with an inner casing, each said inner casing having:
- a fluid storage space defined therein;
- a lower side formed with a fluid outlet for bringing the fluid storage space into communication with a corresponding said fluid action space; and
- a lateral side which is distant from a corresponding said housing portion and formed with a fluid inlet for bringing the fluid storage space into communication with the fluid action space, the fluid inlet being located at a higher position than the fluid outlet.
17. The exercise equipment of claim 9, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
18. The exercise equipment of claim 10, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
19. The exercise equipment of claim 11, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
20. The exercise equipment of claim 12, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
21. The exercise equipment of claim 13, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
22. The exercise equipment of claim 14, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
23. The exercise equipment of claim 15, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
24. The exercise equipment of claim 16, further comprising a watertight washer provided in each said fluid storage space, wherein each said watertight washer is flexible, has a surface portion adjacent to an outer rim of the watertight washer and fixed to the housing, and has a surface portion adjacent to a center of the watertight washer and attached to a corresponding said shaft while still allowing the shaft to rotate with a corresponding said driven wheel.
25. The exercise equipment of claim 17, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
26. The exercise equipment of claim 18, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
27. The exercise equipment of claim 19, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
28. The exercise equipment of claim 20, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
29. The exercise equipment of claim 21, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
30. The exercise equipment of claim 22, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
31. The exercise equipment of claim 23, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
32. The exercise equipment of claim 24, further comprising a grip pivotally connected by a pivot to an end of each said driving member, each said grip being rotatable about a rotation axis defined by a corresponding said pivot.
Type: Application
Filed: Apr 20, 2012
Publication Date: Nov 1, 2012
Inventor: Zih-Yuan Lin (New Taipei City)
Application Number: 13/451,676
International Classification: A63B 21/008 (20060101);