Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-02-11
2001-10-30
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S263000, C188S164000
Reexamination Certificate
active
06310416
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a resistance-effecting mechanism capable of reversing a rotary wheel in motion as soon as the rotary wheel is relieved of an external force exerting thereon. The present invention is based on the principle that the direct current magnetic field has a braking effect on an electrically-conductive body in motion. The present invention is provided with a power source control mechanism capable of digital control of the magnitude of the electric current input so as to enable a user of the present invention to adjust precisely the magnitude of a resistance force and the magnitude of the reaction force of the pulling force. The present invention is further provided with a means for reducing the pulling force so as to enhance the performance of a device on which the present invention is applied.
BACKGROUND OF THE INVENTION
The conventional devices for effecting a resistance are generally provided with a friction means, an oil pressure means, a vortex, a generator, etc. These conventional devices are generally defective in design in that they are capable of effecting a resistance of a limited intensity, and that they are incapable of pulling back an object in motion. As a result, the application of the conventional devices is limited to the exercise machine, such as the exercise bicycle or the like. In other words, the conventional devices can not be used in conjunction with the exercise devices, such as an arm developing device, a rowing device, a chest building device, etc. the conventional exercise devices are generally provided with a lead block as a load. The lead block falls back to its original position as soon as the lead block is releved of the application force. The user of such conventional exercise devices is susceptible to bodily injury which is caused by the reaction force of the lead block. In other words, the lead block is a primitive means for providing an exercise device with a load. Among the conventional devices for effecting a resistance, the most advanced device is provided with an electromagnetic coil as the magnetic field source for effecting the resistance, which can be adjusted in magnitude by the digital or analog device, as shown in FIG.
1
. This prior art device is provided with an electromagnetic core A on which an electromagnetic coil R is wound. The electromagnetic core A is of a U-shaped construction and is provided with a space M in which the rim of a braking wheel is received. When the coil is provided with the electric current, a magnetic field is brought about. In the meantime, the magnetic flux is brought about on the core A. As the braking wheel is actuated to turn, the rim of the braking wheel in motion moves through the space M of the core A, thereby resulting in the production of eddy current which forms a reverse rotation moment serving as a load to the braking wheel. Such a prior art device as described above with reference to
FIG. 1
is defective in design in that the application point of the resistance effected by the device is relatively small, and that the magnetic loop of the prior art device is vulnerable to magnetic leakage. As a result, the braking wheel in motion can not be effectively controlled by the resistance which is brought about by the prior art device.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a resisting and pulling mechanism which is free from the drawbacks of the prior art device described above.
It is another objective of the present invention to provide a resisting and pulling mechanism which is suitable for use in a variety of devices, especially the exercise devices.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by a resisting and pulling mechanism capable of providing a rotary wheel with a strong resistance force such that the rotary wheel in motion is pulled back at the time when the rotary wheel in motion is relieved of an application force exerting thereon. The mechanism of the present invention is thus suitable for use in the exercise devices, such as the arm developing machine, the rowing machine, the chest building machine, etc. The magnitude of the resistance effected by the mechanism of the present invention can be adjusted as desired. For example, when an exerciser releases the pull handles of the arm developing machine or the chest building machine, the mechanism of the present invention prevents the pull handles from moving back suddenly. As a result, the arms or the body of the exerciser can be protected from the reaction force, which is moderated by the mechanism of the present invention.
The important advantage of the present invention is that the application force surface of the resistance is relatively larger, and that the magnetic loop of the present invention is not susceptible to magnetic leakage, and further that the electric current input of the present invention is capable of bringing about a stable magnetic flux which interacts with the eddy current to effect a reverse rotation moment (resistance) of a greater magnitude. The rotation of the rotary wheel can be thus effectively controlled by the present invention. In addition, the resistance effected by the mechanism of the present invention can be transmitted to an external device.
The present invention is further characterized by an excited magnetic disk or cylinder, which is provided with an excited magnetic coil and is coaxially disposed along with a braking wheel such that the exited magnetic disk and the braking wheel are separated from each other by an air gap. As the excited magnetic coil is provided with the electric current, a magnetic field is brought about around the coil. In the meantime, a magnetic flux is brought about on the excited magnetic disk or cylinder. As the excited magnetic disk and the braking wheel turn in relation to each other, the eddy current is induced between the magnetic poles and the braking wheel such that the eddy current interacts with the magnetic flux to effect a rotation moment opposite in direction to the rotation of the braking wheel. The resistance so effected by the present invention is used as a load in a variety of devices, especially the exercise devices. The resistance can be also transmitted externally by means of a pulley or a belted wheel.
In the event that the braking wheel turns without interruption, the eddy current is induced between the braking wheel in motion and the excited magnetic disk. The eddy current interacts with the magnetic flux to bring about a rotation moment. When the excited magnetic disk is exerted on by an external force opposite in direction to the rotation moment, a resistance force is effected. When the excited magnetic disk is relieved of the external force exerting thereon, the excited magnetic disk is acted on by the rotation moment such that the excited magnetic disk is pulled back. In the meantime, the current input is reduced to result in the corresponding reduction in the strength of the rotation moment, thereby causing the pulling force of the excited magnetic disk to become weaker. As a result, the present invention can be used as a moderating mechanism of the arm developing machine, the rowing machine, the chest building machine, etc. In other words, the moderating mechanism of the present invention can avert the bodily injury of an exerciser. The magnitude of the rotation moment is dependent on the relative rotational speed difference and the magnitude of the excited magnetic current. As a result, the rotation moment output can be regulated by the input of the excited magnetic current.
The foregoing objectives, features, functions, and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of two preferred embodiments of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 3824420 (1974-07-01), Stegeman et al.
patent: 4713567 (1987-12-01), Fey et al.
patent: 4780637 (1988
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