US4750738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Physical exercise apparatus for isokinetic and eccentric training
Assignee: Individual
•
Filing: 1987-02-26
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Granted: 1988-06-14
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Expires: 2007-02-26
Abstract
Abstract A physical exercise apparatus for isokinetic and eccentric training which employs a permanent magnet electric motor/generator as the means for generating positive and negative loads. An electrical braking circuit which employs zener diodes governs the speed of a permanent magnet electric generator by providing a sharp increase of resisting torque with increasing rotation speed when the rotation speed reaches a predetermined value.
Inventors
- 👤 Chi H. Dang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:46
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/15; A63B21/151; A63B21/005; A63B21/0053; A63B21/157
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a single direction rotary clutching means connecting the drive shaft of the motor armature to the user input means in an arrangement such that the user input means is free to rotate relative to the motor armature shaft in the recoiling direction; (d) a recoiling means applying a torque to the user input means in the recoiling direction; (e) a power supply means supplying electrical power to the electric motor, generating a torque in the recoiling direction, which is substantially greater than the torque generated by the recoiling means; (f) a means to detect the most contracted state of the muscles under training and to activate the power supply means when the most contracted state is detected; (g) a means to detect the most extended state of the muscles under training and to deactivate the power supply means when the most extended state is detected.
Claim 2
Dependent Claim
189 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a single direction rotary clutching means connecting the drive shaft of the motor armature to the user input means in an arrangement such that the user input means is free to rotate relative to the motor armature shaft in the recoiling direction; (d) a recoiling means applying a torque to the user input means in the recoiling direction; (e) a power supply means supplying electrical power to the electric motor, generating a torque in the recoiling direction, which is substantially greater than the torque generated by the recoiling means; (f) a means to detect the most contracted state of the muscles under training and to activate the power supply means when the most contracted state is detected; (g) a means to detect the most extended state of the muscles under training and to deactivate the power supply means when the most extended state is detected.
Claim 3
Dependent Claim
22 words
The physical exercise apparatus of claim 1 wherein said power supply means includes means for adjusting electrical voltage and current output limits.
Claim 4
Dependent Claim
231 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a speed reducing means, the high speed input shaft of said speed reducing means is connected to the drive shaft of the motor armature; (d) a single direction rotary clutching means connecting the low speed input shaft of the speed reducing means to the user input means in an arrangement such that the user input means is free to rotate relative to the low speed input shaft of the speed reducing means in the recoiling direction; (e) a recoiling means applying a torque to the user input means in the recoiling direction; (f) a power supply means supplying electrical power to the electric motor, generating a torque that rotates the user input means in the recoiling direction, this generated torque is substantially greater than the torque generated by the recoiling means; (g) a means to detect the most contracted state of the muscles under training and to activate the power supply means when the most contracted state is detected; (h) a means to detect the most extended state of the muscles under training and to deactivate the power supply means when the most extended state is detected.
Claim 5
Dependent Claim
231 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a speed reducing means, the high speed input shaft of said speed reducing means is connected to the drive shaft of the motor armature; (d) a single direction rotary clutching means connecting the low speed input shaft of the speed reducing means to the user input means in an arrangement such that the user input means is free to rotate relative to the low speed input shaft of the speed reducing means in the recoiling direction; (e) a recoiling means applying a torque to the user input means in the recoiling direction; (f) a power supply means supplying electrical power to the electric motor, generating a torque that rotates the user input means in the recoiling direction, this generated torque is substantially greater than the torque generated by the recoiling means; (g) a means to detect the most contracted state of the muscles under training and to activate the power supply means when the most contracted state is detected; (h) a means to detect the most extended state of the muscles under training and to deactivate the power supply means when the most extended state is detected.
Claim 6
Dependent Claim
22 words
The physical exercise apparatus of claim 3 wherein said power supply means includes means for adjusting electrical voltage and current output limits.
Claim 7
Dependent Claim
248 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a speed reducing means, the high speed input shaft of said speed reducing means is connected to the drive shaft of the motor armature; (d) a single direction rotary clutching means connecting the low speed input shaft of the speed reducing means to the user input means in an arrangement such that the user input means is free to rotate relative to the low speed input shaft of the speed reducing means in the recoiling direction; (e) a recoiling means applying a torque to the user input means in the recoiling direction; (f) a power supply means supplying electrical power to the electric motor, generating a torque that rotates the user input means in the recoiling direction, this generated torque is substantially greater than the torque generated by the recoiling means; (g) a means to detect the most extended state of the muscles under training, to deactivate the power supply means when the most extended state is detected, and to activate the power supply means after a time delay interval since the detection of the exiting from the most extended state, the time delay interval must be sufficient for bringing the muscles under training from the most extended state to the most contracted state.
Claim 8
Dependent Claim
248 words
A physical exercise apparatus which comprises: (a) a user input means rotated in a direction referred as recoiling direction when the muscles under training extend and in a direction referred as unwinding direction when the muscles under training contract; (b) an electric motor; (c) a speed reducing means, the high speed input shaft of said speed reducing means is connected to the drive shaft of the motor armature; (d) a single direction rotary clutching means connecting the low speed input shaft of the speed reducing means to the user input means in an arrangement such that the user input means is free to rotate relative to the low speed input shaft of the speed reducing means in the recoiling direction; (e) a recoiling means applying a torque to the user input means in the recoiling direction; (f) a power supply means supplying electrical power to the electric motor, generating a torque that rotates the user input means in the recoiling direction, this generated torque is substantially greater than the torque generated by the recoiling means; (g) a means to detect the most extended state of the muscles under training, to deactivate the power supply means when the most extended state is detected, and to activate the power supply means after a time delay interval since the detection of the exiting from the most extended state, the time delay interval must be sufficient for bringing the muscles under training from the most extended state to the most contracted state.
Claim 9
Dependent Claim
22 words
The physical exercise apparatus of claim 5 wherein said power supply means includes means for adjusting electrical voltage and current output limits.
References Cited (Backward Citations)
US3572700A
Cited
US4261562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |