US3678773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed drive
Assignee: FITNESS IND Inc
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Filing: 1970-12-22
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Granted: 1972-07-25
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Expires: 1990-12-22
Abstract
Abstract A variable speed drive comprising a drive motor mounted in a frame for pivotal movement by means of a reversible motor and screw drive unit operatively connected to the drive motor. A shaft to be driven is mounted parallel to the shaft of the drive motor and power is transmitted from the drive motor to the shaft to be driven through a belt and variable speed pulley, preferably of the type in which the diameter of the pulley decreases as the motor shaft is moved away from the shaft to be driven, and vice versa.
Inventors
- 👤 Royal E Rohrbach
- 👤 Royce W Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:10
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
216 words
In a variable speed drive, a. a drive motor having an output shaft, b. a shaft to be driven mounted for rotation and spaced from the motor and generally parallel to the shaft of the motor, c. a shaft parallel to the shaft of the drive motor oN which the drive motor is mounted, d. means mounting the shaft on which the motor is mounted for rocking movement whereby the motor shaft may be moved toward and from the shaft to be driven, e. a reversible motor and screw drive unit operatively connected to the drive motor for rocking it so as to move its shaft toward and from the shaft to be driven, f. a second shaft on which the reversible motor and drive screw unit is mounted, said second shaft being rotatably mounted and parallel to the shaft on which the drive motor is mounted and being located between the shaft supporting the drive motor and the shaft to be driven, and g. a variable diameter driving connection between the drive motor shaft and the shaft to be driven, whereby moving the drive motor shaft toward the shaft to be driven increases the diameter of the driving connection and hence increases the speed of rotation to the shaft to be driven, and vice versa.
Claim 2
Dependent Claim
216 words
In a variable speed drive, a. a drive motor having an output shaft, b. a shaft to be driven mounted for rotation and spaced from the motor and generally parallel to the shaft of the motor, c. a shaft parallel to the shaft of the drive motor oN which the drive motor is mounted, d. means mounting the shaft on which the motor is mounted for rocking movement whereby the motor shaft may be moved toward and from the shaft to be driven, e. a reversible motor and screw drive unit operatively connected to the drive motor for rocking it so as to move its shaft toward and from the shaft to be driven, f. a second shaft on which the reversible motor and drive screw unit is mounted, said second shaft being rotatably mounted and parallel to the shaft on which the drive motor is mounted and being located between the shaft supporting the drive motor and the shaft to be driven, and g. a variable diameter driving connection between the drive motor shaft and the shaft to be driven, whereby moving the drive motor shaft toward the shaft to be driven increases the diameter of the driving connection and hence increases the speed of rotation to the shaft to be driven, and vice versa.
Claim 3
Dependent Claim
83 words
Apparatus as defined in claim 1 in which the drive motor is mounted on a base, said base being mounted on said shaft which mounts the motor, said base having a forwardly extending portion, and a threaded driving connection for the screw of the screw drive unit connected to the forward extension of the motor base, whereby as the screw rotates the extension is moved up and down, thereby to rock the drive motor shaft toward and from the shaft to be driven.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |