Patent US3731174A successfully refreshed from Google Patents.
US3731174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition control device and system
Assignee: Individual
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Filing: 1972-08-24
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Granted: 1973-05-01
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Expires: 1992-08-24
Abstract
Abstract A timing device controls a group of electric heaters, turning them on in sequence in response to call for heat by a thermostat and turning them off in sequence when the call for heat is satisfied. The timer has two stopping points, one with the heaters off and the other with the heaters on. A single switch controls the timer motor and is opened by a timer cam at the off and on positions. The switch is held open at the off position by an off latch and at the on position by an on latch. These latches are released by a solenoid controlled by the room thermostat. The latches are also controlled by a timer cam, the off latch being held released when the timer is in the on position, and the on latch being held out at the off position. The load switches for the heaters are also opened instantly by a second solenoid responding to an unfavorable condition. This same action releases the on latch to cause the timer to return to the off position.
Inventors
- 👤 J Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:39
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/10; H01H43/12; H01H43/125; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1951
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
217 words
In a condition changing system having a plurality of condition changers, a cam shaft, load switches actuated in sequence by the cam shaft and connected to said condition changers, a motor arranged to drive said cam shaft, said cam shaft having a standby position in which the condition changers are off and a run position in which the condition changers are on, the condition changers being energized in sequence as the cam shaft is driven from the standby position to the run position, and being deenergized in sequence as the cam shaft is driven from the run position to the standby position, a switch connected to the motor, operating means for the switch arranged to maintain the motor in operation when the cam shaft is between the run and standby positions and to stop the motor when the cam shaft is either in the run or standby positions, said operating means including cam means on the shaft for opening the switch at the standby position and at the run position, a standby latch for holding the switch open in the standby position, a run latch for holding the switch open in the run position, an electro-magnet arranged to selectively release one or the other of said latches, and a condition responsive device arranged to control said electro-magnet.
Claim 2
Dependent Claim
217 words
In a condition changing system having a plurality of condition changers, a cam shaft, load switches actuated in sequence by the cam shaft and connected to said condition changers, a motor arranged to drive said cam shaft, said cam shaft having a standby position in which the condition changers are off and a run position in which the condition changers are on, the condition changers being energized in sequence as the cam shaft is driven from the standby position to the run position, and being deenergized in sequence as the cam shaft is driven from the run position to the standby position, a switch connected to the motor, operating means for the switch arranged to maintain the motor in operation when the cam shaft is between the run and standby positions and to stop the motor when the cam shaft is either in the run or standby positions, said operating means including cam means on the shaft for opening the switch at the standby position and at the run position, a standby latch for holding the switch open in the standby position, a run latch for holding the switch open in the run position, an electro-magnet arranged to selectively release one or the other of said latches, and a condition responsive device arranged to control said electro-magnet.
Claim 3
Dependent Claim
44 words
A control system as defined in claim 1 in which means on the cam shaft holds the run latch released when the shaft is in the standby position and holds the standby latch in released position when the shaft is in the run position.
Claim 4
Dependent Claim
54 words
A control system as defined in claim 1 having a second electro-magnet arranged to actuate the load switches simultaneously for stopping the condition changers in response to an unfavorable condition, said second electro-magnet also being arranged to release the run latch for causing the cam shaft to be driven back to the standby position.
Claim 5
Dependent Claim
218 words
In a control system for a power operated device, the combination of, a power source for energizing said device, a load switch for controlling the power to said device, a timer motor, means including a single throw type timer motor switch for stopping and starting the timer motor, an electro-magnet arranged to mechanically operate said timer motor switch, closing the same upon movement of the electro-magnet in one direction, control means connected to the electro-magnet for controlling the same and arranged to selectively energize and deenergize said electro-magnet, causing it to move in said one direction or the opposite direction, said timer motor switch and timer motor being connected across a source of power independently of said control means thereby causing operation of the timer motor at any time when the timer motor switch is closed, independently of said control means, means operated by the timer motor for causing closure of the load switch after a predetermined closure of the timer motor switch, means opening the timer motor switch to stop the timer motor after closure of the load switch, means operated by movement of the electro-magnet in said opposite direction for reclosing said timer motor switch, and means operated by the timer motor for reopening the timer motor switch after a period of time of closure thereof.
Claim 6
Dependent Claim
218 words
In a control system for a power operated device, the combination of, a power source for energizing said device, a load switch for controlling the power to said device, a timer motor, means including a single throw type timer motor switch for stopping and starting the timer motor, an electro-magnet arranged to mechanically operate said timer motor switch, closing the same upon movement of the electro-magnet in one direction, control means connected to the electro-magnet for controlling the same and arranged to selectively energize and deenergize said electro-magnet, causing it to move in said one direction or the opposite direction, said timer motor switch and timer motor being connected across a source of power independently of said control means thereby causing operation of the timer motor at any time when the timer motor switch is closed, independently of said control means, means operated by the timer motor for causing closure of the load switch after a predetermined closure of the timer motor switch, means opening the timer motor switch to stop the timer motor after closure of the load switch, means operated by movement of the electro-magnet in said opposite direction for reclosing said timer motor switch, and means operated by the timer motor for reopening the timer motor switch after a period of time of closure thereof.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |