US4039057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor with fluid operated clutch
Assignee: Coal Industry Patents Ltd
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Filing: 1975-12-19
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Granted: 1977-08-02
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Expires: 1995-12-19
Abstract
Abstract A current transformer is provided in the terminal box of the conveyor drive motor to sense the operational mode of the motor and to actuate a solenoid in response to the sensed mode, the solenoid, in turn, actuating a hydraulic valve to control the operation of the clutch.
Inventors
- 👤 Harry Monks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:31
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
133 words
Control means for controlling a hydraulically actuated clutch drivably connectable intermediate an electrical drive assembly and a driven assembly, comprising sensor means mountable on the electric drive assembly for sensing if electrical current is being supplied to the drive assembly, solenoid means energized in response to an output from the sensor means, hydraulic valve means mechanically linked to the solenoid means and thereby actuated in response to the solenoid means being energized by said output of the sensor means, relay control means hydraulically linked to the hydraulic valve means and thereby actuated in response to actuation of the hydraulic valve means, and hydraulic pump means driven by the electrical drive assembly to supply hydraulic fluid for actuating the clutch and being hydraulically connected thereto by the relay control means when it is actuated.
Claim 2
Dependent Claim
133 words
Control means for controlling a hydraulically actuated clutch drivably connectable intermediate an electrical drive assembly and a driven assembly, comprising sensor means mountable on the electric drive assembly for sensing if electrical current is being supplied to the drive assembly, solenoid means energized in response to an output from the sensor means, hydraulic valve means mechanically linked to the solenoid means and thereby actuated in response to the solenoid means being energized by said output of the sensor means, relay control means hydraulically linked to the hydraulic valve means and thereby actuated in response to actuation of the hydraulic valve means, and hydraulic pump means driven by the electrical drive assembly to supply hydraulic fluid for actuating the clutch and being hydraulically connected thereto by the relay control means when it is actuated.
Claim 3
Dependent Claim
29 words
Control means as claimed in claim 1, in which the sensor means comprises a transformer adapted to give an output when current is received from an electrical supply source.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |