US3814949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timing control device
Assignee: Individual
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Filing: 1972-09-18
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Granted: 1974-06-04
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Expires: 1992-09-18
Abstract
Abstract A timing control device which is suitable for use in controlling equipment in a photographic dark room, includes a pair of electronic switches for alternatively activating either of two loads. A timer is provided which utilizes a wire wound potentiometer for setting a precise timing period. The timing circuit, which includes a resistive-capacitive charging circuit, is utilized to generate a ramp voltage which is fed to the anode of a programmable unijunction transistor, the output of the timing control potentiometer being fed to the gate of this transistor to set the program therefor. The programmable unijunction transistor is utilized to provide a keying signal which actuates an electronic switch which in turn controls the switching circuits associated with the loads. Initiation of the timing action is controlled by means of a touch plate which actuates a switching circuit which in turn activates the timing circuit.
Inventors
- 👤 S Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H03K17/292; H03K17/94; H03K17/96; H03K17/962
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
285 words
A timing control device for controlling the application of power from a power source through load means for predetermined periods of time comprising: a timer for generating a timing signal cOrresponding to the end of each of said predetermined periods of time, means for switching power from said power source to said load means, and a power control circuit for controlling the application of power to said timer and actuating said means for switching power, the timing operation of said timer being initiated when power is supplied thereto from said power control circuit, said timer including a resistive-capacitive charge circuit for generating a ramp voltage, a precision potentiometer connected to the output of said power control circuit to provide a selectable voltage and electronic switch means having cathode and anode electrodes and a control gate, said control gate receiving the output of said potentiometer, one of said electrodes receiving said ramp voltage, the timing signal appearing at the other of said electrodes when the ramp voltage goes above the voltage on said control gate, said power control circuit receiving the output of said power source and including voltage regulator circuit means for regulating said power source output and electronic switch means for effectively shunting said regulator circuit at all times except during the timing cycles of said timer, said power control circuit further including manually operable switch means for providing an actuating signal for said electronic switch means to initiate the supply of current from said power control circuit to said timer, the timing signal from said timer being fed to said electronic switch means to actuate said electronic switch means to remove the supply of power to said timer to terminate each timing cycle.
Claim 2
Dependent Claim
285 words
A timing control device for controlling the application of power from a power source through load means for predetermined periods of time comprising: a timer for generating a timing signal cOrresponding to the end of each of said predetermined periods of time, means for switching power from said power source to said load means, and a power control circuit for controlling the application of power to said timer and actuating said means for switching power, the timing operation of said timer being initiated when power is supplied thereto from said power control circuit, said timer including a resistive-capacitive charge circuit for generating a ramp voltage, a precision potentiometer connected to the output of said power control circuit to provide a selectable voltage and electronic switch means having cathode and anode electrodes and a control gate, said control gate receiving the output of said potentiometer, one of said electrodes receiving said ramp voltage, the timing signal appearing at the other of said electrodes when the ramp voltage goes above the voltage on said control gate, said power control circuit receiving the output of said power source and including voltage regulator circuit means for regulating said power source output and electronic switch means for effectively shunting said regulator circuit at all times except during the timing cycles of said timer, said power control circuit further including manually operable switch means for providing an actuating signal for said electronic switch means to initiate the supply of current from said power control circuit to said timer, the timing signal from said timer being fed to said electronic switch means to actuate said electronic switch means to remove the supply of power to said timer to terminate each timing cycle.
Claim 3
Dependent Claim
53 words
The device of claim 1 wherein said electronic switch means comprises a semiconductor switching device having a sensitive gate, said manually operable switch means comprising a touch plate connected to the gate of said switching device whereby the touching of said touch plate provides current to said gate to fire said switching device.
Claim 4
Dependent Claim
33 words
The device of claim 1 wherein said load means comprises first and second loads and switch means responsive to said power control circuit for alternatively activating one or the other of said loads.
Claim 5
Dependent Claim
37 words
The device of claim 1 wherein said voltage regulator circuit means comprises a plurality of series connected zener diodes, said electronic switch means comprising a silicon controlled rectifier connected in shunt across the series connected zener diodes.
Claim 6
Dependent Claim
66 words
The device of claim 1 wherein said means for switching power to said load comprises an electronic switch having a gate control circuit, a photoelective cell in said gate control circuit, lamp means connected in said power control circuit, said lamp means being driven to the illuminated state by said power control circuit to excite said photoelectric cell thereby causing said electronic switch to be actuated.
Claim 7
Dependent Claim
70 words
The device of claim 1 and additionally including electronic switch means connected across the capacitive portion of said charge circuit for discharging said capacitive portion on the completion of each timing cycle, said switch means being activated in response to said timing signal, and means for providing bias to said last mentioned switch means to maintain said switch means in a deactivated state except when actuated by said timing signal.
Claim 8
Dependent Claim
187 words
A timing control device for controlling the application of power from a power source to a load during predetermined time intervals comprising: electronic switch means for interconnecting said power source and said load, power control circuit means for controlling the operation of said electronic switch means, said power control circuit means including manually operable switch means, and timer means for providing a timing control signal for controlling the operation of said power control circuit means, said timer means including a resistive-capacitive charge circuit for generating a ramp voltage, said charge circuit receiver a voltage from said power control circuit means to initiate the charging tHereof in response to an actuation of said manually operable switch means, a potentiometer connected to receive voltage from said power control circuit for selecting a desired voltage and a programmable unijunction transistor, the program gate of said unijunction transistor receiving the output of said potentiometer, the anode of said unijunction transistor receiving said ramp voltage, said timing control signal appearing at the cathode of said unijunction transistor when the ramp voltage at the anode thereof exceeds the voltage at the gate thereof.
Claim 9
Dependent Claim
187 words
A timing control device for controlling the application of power from a power source to a load during predetermined time intervals comprising: electronic switch means for interconnecting said power source and said load, power control circuit means for controlling the operation of said electronic switch means, said power control circuit means including manually operable switch means, and timer means for providing a timing control signal for controlling the operation of said power control circuit means, said timer means including a resistive-capacitive charge circuit for generating a ramp voltage, said charge circuit receiver a voltage from said power control circuit means to initiate the charging tHereof in response to an actuation of said manually operable switch means, a potentiometer connected to receive voltage from said power control circuit for selecting a desired voltage and a programmable unijunction transistor, the program gate of said unijunction transistor receiving the output of said potentiometer, the anode of said unijunction transistor receiving said ramp voltage, said timing control signal appearing at the cathode of said unijunction transistor when the ramp voltage at the anode thereof exceeds the voltage at the gate thereof.
Claim 10
Dependent Claim
37 words
The device of claim 7 wherein said manually operable switch means includes a silicon controlled rectifier having a sensitive gate and a touch plate for providing an actuation signal to said gate when touched by an operator.
Claim 11
Dependent Claim
93 words
The device of claim 7 wherein said power control circuit means includes voltage regulator circuit means comprising a plurality of series connected zener diodes, a silicon controlled rectifier connected in shunt across said zener diodes, said silicon controlled rectifier being activated to effectively shunt out the current supply to said charge circuit and said potentiometer in response to said timing control signal, said silicon controlled rectifier being deactivated in response to said manually operable switch means to remove said shunt and permit the supply of current to said charge circuit and said potentiometer.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |