US3854916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System using motor driven control device
Assignee: General Electric Co
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Filing: 1973-06-29
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Granted: 1974-12-17
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Expires: 1993-06-29
Abstract
Abstract Refrigeration system includes a timer particularly adapted for controlling the defrost cycle of a refrigerator, and an electric motor that may be used, e.g., to drive an evaporator or condenser cooling fan. Control device and motor detachably secured and magnetically coupled to one another. Speed reducing gear train is mechanically driven from the control device input member and a switch actuator cam cyclically causes selective opening and closing of switch contacts. Control device may be enclosed to prevent the admission of foreign matter. Unit bearing type of motor includes a polarized magnetic body that forms part of the rotor assembly and is rotatable within a lubricant reservoir of the motor. Oil reservoir cover is formed of nonferromagnetic material. The polarized magnetic body establishes a magnetic field that extends beyond the confines of the motor and causes similar movement of a polarized magnetic body in the control device. When control device is stalled torque body is alternately supplied by and received by the motor.
Inventors
- 👤 R Dochterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/002; F25D21/004; H; H02; H02K; H02K7/00; H02K7/10; H02K7/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A refrigeration system including refrigeration heat transfer means comprising condenser and evaporator coils, a motor driven compressor interconnected with the condenser and evaporator coils, an electric fan motor drivingly coupled with fan means for forcing air past at least some of the coils, and a control device including switching means for selectively providing excitation voltage for the compressor motor; said fan motor including a magnetic power output member and said control device including a magnetic power input member, said fan motor and control device being magnetically coupled through the output and input members so that the control device is driven by the fan motor during normal operation of the system and so that fAn motor operation is not adversely affected during excitation of the compressor motor by malfunctions of the control device.
Claim 2
Dependent Claim
132 words
A refrigeration system including refrigeration heat transfer means comprising condenser and evaporator coils, a motor driven compressor interconnected with the condenser and evaporator coils, an electric fan motor drivingly coupled with fan means for forcing air past at least some of the coils, and a control device including switching means for selectively providing excitation voltage for the compressor motor; said fan motor including a magnetic power output member and said control device including a magnetic power input member, said fan motor and control device being magnetically coupled through the output and input members so that the control device is driven by the fan motor during normal operation of the system and so that fAn motor operation is not adversely affected during excitation of the compressor motor by malfunctions of the control device.
Claim 3
Dependent Claim
37 words
The refrigeration system of claim 1 wherein the fan motor and control device are separate modules assembled together with the magnetic power output member and magnetic power input members positioned in torque transmitting relationship to one another.
Claim 4
Dependent Claim
121 words
A refrigeration system including refrigeration heat transfer means comprising condenser and evaporator coils, a motor driven compressor interconnected with the condenser and evaporator coils, an electric fan motor drivingly coupled with fan means for forcing air past at least some of the coils, and a control device including switching means for selectively providing excitation voltage for the compressor motor; said fan motor and control device being interconnected with torque transmission means for continuously supplying driving torque to the control device from the fan motor during normal operation of the control device and for alternately applying driving torque to and receiving driving torque from the control device during operation of the fan motor when the control device is in a stalled condition.
Claim 5
Dependent Claim
121 words
A refrigeration system including refrigeration heat transfer means comprising condenser and evaporator coils, a motor driven compressor interconnected with the condenser and evaporator coils, an electric fan motor drivingly coupled with fan means for forcing air past at least some of the coils, and a control device including switching means for selectively providing excitation voltage for the compressor motor; said fan motor and control device being interconnected with torque transmission means for continuously supplying driving torque to the control device from the fan motor during normal operation of the control device and for alternately applying driving torque to and receiving driving torque from the control device during operation of the fan motor when the control device is in a stalled condition.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |