US3578950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heat sequence control
Assignee: Eaton Corp
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Filing: 1969-07-07
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Granted: 1971-05-18
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Expires: 1989-07-07
Abstract
Abstract When the thermostat calls for heat the motor starts and rotates the cam bank to start the fan first and then place the heaters on the line in sequence. After all heaters are on the line the motor circuit is transferred to control by the cold contact of the SPDT thermostat so the motor will stop and keep all heaters on the line until the thermostat is satisfied at which time the heaters are taken off the line in sequence. Once the sequence starts it must be completed notwithstanding changes in the thermostat condition. The only exception is limit switch opening or power failure causing deenergization of the solenoid allowing the spring biased lever to open all heater circuits and require homing the control at its starting point before heaters can be put back on the line.
Inventors
- 👤 Clyde C Moratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:01
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/10; H01H43/12; H01H43/125; F; F24; F24C; F24C7/00; F24C7/08; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1912; G05D23/275; H01H19/00; H01H19/54; H01H19/60; H01H19/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A sequence control for electric heating comprising, a cam bank, a motor driving the cam bank, a thermostat controlling the motor, a plurality of heater switches controlled by cams on the cam bank to be closed in sequence as the cam bank is rotated, means for normally interrupting the rotation of the cam bank only after all the heater switches are closed and then only if the thermostat still calls for heat, the motor driving the cam bank upon satisfaction of the thermostat to open the heater switches in sequence and to interrupt the power supply to the motor after all the heater switches have been opened.
Claim 2
Dependent Claim
107 words
A sequence control for electric heating comprising, a cam bank, a motor driving the cam bank, a thermostat controlling the motor, a plurality of heater switches controlled by cams on the cam bank to be closed in sequence as the cam bank is rotated, means for normally interrupting the rotation of the cam bank only after all the heater switches are closed and then only if the thermostat still calls for heat, the motor driving the cam bank upon satisfaction of the thermostat to open the heater switches in sequence and to interrupt the power supply to the motor after all the heater switches have been opened.
Claim 3
Dependent Claim
60 words
A control according to claim 1 in which the interrupting means comprises a switch operated by the cam bank and connected to the motor and the room thermostat to transfer from the call-for-heat circuit to the heat-satisfied circuit of the thermostat after all the heater switches are closed whereby the motor operation is not resumed until the thermostat is satisfied.
Claim 4
Dependent Claim
50 words
A control according to claim 1 including means responsive to an abnormal condition to open all said switches and keep them open until the condition has been corrected and the cam bank has been returned to the position in which all the switches would be opened by the cam bank.
Claim 5
Dependent Claim
61 words
A control according to claim 3 in which the means responsive to an abnormal condition includes a solenoid in circuit with a limit switch, a lever actuated by the solenoid and engaging the heater switches upon deenergization of the solenoid in response to opening the limit switch or to power failure, a spring biasing the lever in the switch opening direction.
Claim 6
Dependent Claim
41 words
A control according to claim 4 in which the lever operates on the cam operated motor control switch to insure supply of power to the motor upon correction of the abnormal condition without regard for the operating state of the thermostat.
Claim 7
Dependent Claim
25 words
A control according to claim 5 including a fan switch operated by the cam bank to be closed first and opened last in any sequence.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |