US3944790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic digital timer for an electronic range
Assignee: Toshiba Corp
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Filing: 1974-04-12
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Granted: 1976-03-16
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Expires: 1994-04-12
Abstract
Abstract An electronic digital timer for an electronic range wherein the desired time of cooking is determined by a time setter; the time of cooking thus set is indicated in a digital fashion; a counter counts the number of pulses generated when the electronic range commences heating; and the heating operation is brought to an end when coincidence takes place between the number of counts made by the counter and a number determined corresponding to the preset time.
Inventors
- 👤 Motokazu Tamano
- 👤 Masanobu Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:34
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0225; G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/10; G05B19/102; G05B19/106
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
253 words
An electronic digital timer for an electronic range which comprises a time-setting section for defining a desired length of time; a pulse generator for sending forth pulses at a prescribed interval; a counter section for commencing the counting of pulses given forth by the pulse generator as soon as the electronic range begins heating; a time detection section for producing an output when a prescribed relationship arises between the counts made by the counter section and a length of time previously set by the time-setting section; a control device for stopping heating by the electronic range according to an output from the time detection section; the time detection section having a gate circuit for producing an output when a length of time set by the time-setting section is zero; the control device includes a reset switch; a first SCR whose gate electrode is selectively supplied with outputs from said reset switch, time detection section and gate circuit; a cooking stop switch; a second SCR whose gate electrode is supplied with an output from said cooking stop switch; a cooking start switch; means for forcefully bringing the first and second SCR's into the OFF state upon the closure of the cooking start switch; a transistor rendered operative upon the actuation of the first SCR; a thyristor put into operation upon the energization of said transistor; an electromagnetic switch energized upon the operation of said thyristor; and means for actuating the power supply circuit of the electronic range upon the actuation of said electromagnetic switch.
Claim 2
Dependent Claim
253 words
An electronic digital timer for an electronic range which comprises a time-setting section for defining a desired length of time; a pulse generator for sending forth pulses at a prescribed interval; a counter section for commencing the counting of pulses given forth by the pulse generator as soon as the electronic range begins heating; a time detection section for producing an output when a prescribed relationship arises between the counts made by the counter section and a length of time previously set by the time-setting section; a control device for stopping heating by the electronic range according to an output from the time detection section; the time detection section having a gate circuit for producing an output when a length of time set by the time-setting section is zero; the control device includes a reset switch; a first SCR whose gate electrode is selectively supplied with outputs from said reset switch, time detection section and gate circuit; a cooking stop switch; a second SCR whose gate electrode is supplied with an output from said cooking stop switch; a cooking start switch; means for forcefully bringing the first and second SCR's into the OFF state upon the closure of the cooking start switch; a transistor rendered operative upon the actuation of the first SCR; a thyristor put into operation upon the energization of said transistor; an electromagnetic switch energized upon the operation of said thyristor; and means for actuating the power supply circuit of the electronic range upon the actuation of said electromagnetic switch.
Claim 3
Dependent Claim
220 words
An electronic range with an electronic digital timer comprising: a time-setting section for defining a desired length of time; a pulse generator for generating pulses at a prescribed interval; a counter section for commencing the counting of pulses generated by the pulse generator as soon as the electronic range begins a heating operation; a time detection section for generating an output when a prescribed relationship arises between the number of pulses counted by the counter section and a length of time previously set by the time-setting section; a control device for stopping the heating operation of the electronic range in accordance with an output from the time detection section; display means for indicating in the form of digits the length of time previously set by the time-setting section and the number of pulses counted by the counter section; the counter section being set at a value corresponding to the length of time set by the time-setting section to, when supplied with a signal instructing the commencement of the heating operation of the electronic range, count down the number of pulses generated by the pulse generator; the control device having a switch rendered inoperative by an output signal from the time detection section; means for controlling a power supply to a high frequency generator of the electronic range through the switch.
Claim 4
Dependent Claim
220 words
An electronic range with an electronic digital timer comprising: a time-setting section for defining a desired length of time; a pulse generator for generating pulses at a prescribed interval; a counter section for commencing the counting of pulses generated by the pulse generator as soon as the electronic range begins a heating operation; a time detection section for generating an output when a prescribed relationship arises between the number of pulses counted by the counter section and a length of time previously set by the time-setting section; a control device for stopping the heating operation of the electronic range in accordance with an output from the time detection section; display means for indicating in the form of digits the length of time previously set by the time-setting section and the number of pulses counted by the counter section; the counter section being set at a value corresponding to the length of time set by the time-setting section to, when supplied with a signal instructing the commencement of the heating operation of the electronic range, count down the number of pulses generated by the pulse generator; the control device having a switch rendered inoperative by an output signal from the time detection section; means for controlling a power supply to a high frequency generator of the electronic range through the switch.
Claim 5
Dependent Claim
63 words
An electronic range according to claim 2 wherein the time-setting section comprises at least one rotary switch for setting time by the decimal system and a decimal numeral-binary code conversion circuit for converting a decimal output from said rotary switch into binary code signals; and the counter section includes binary up-down counters set by an output from said decimal numeral-binary code conversion circuit.
Claim 6
Dependent Claim
44 words
An electronic range according to claim 2 which further comprises a light-emitting indication element actuated by pulses delivered from the pulse-generating section to the counter section upon commencement of heating by the electronic range, thereby indicating the progress of heating by the electronic range.
Claim 7
Dependent Claim
48 words
An electronic range according to claim 2 wherein the counter section has at least one down-counter; and the time detection section has a gate circuit for generating an output when the counts made by the down-counter are brought to zero upon the passage of the previously set time.
Claim 8
Dependent Claim
156 words
An electronic range according to claim 2 wherein the time detection section has a gate circuit for producing an output when a length of time set by the time-setting section is zero; and the control device includes a reset switch; a first SCR whose gate electrode is selectively supplied with outputs from said reset switch, time detection section and gate circuit; a cooking stop switch; a second SCR whose gate electrode is supplied with an output from said cooking stop switch; a cooking start switch; means for forcefully bringing the first and second SCR's into OFF state upon the closure of the cooking start switch; a transistor rendered operative upon the actuation of the first SCR; a thyristor put into operation upon the energization of said transistor; an electromagnetic switch energized upon the operation of said thyristor; and means for actuating the power supply circuit of the electronic range upon the actuation of said electromagnetic switch.
Claim 9
Dependent Claim
21 words
An electronic range according to claim 2 wherein the display device has a plurality of display segments formed of light-emitting diodes.
Claim 10
Dependent Claim
21 words
An electronic range according to claim 7 wherein the display device further includes a display segment for presenting a decimal point.
Claim 11
Dependent Claim
53 words
An electronic range according to claim 2 wherein the pulse-generating section comprises a first time constant circuit including a first variable resistor; a second time constant circuit including a second variable resistor; and a first switch for changing over the connection of the first and second time constant circuit with said pulse-generating section.
Claim 12
Dependent Claim
54 words
An electronic range according to claim 7 which further comprises at least two display devices for indicating a length of time set by the time-setting section including a decimal point; and a second switch for changing over the indication of a decimal point between the display devices in interlocking operation with the first switch.
Claim 13
Dependent Claim
131 words
An electronic range according to claim 2 wherein the pulse-generating section includes first and second time constant circuits connected in series; a short circuit of said second time constant circuit; and a switch provided with a first contact for closing said short circuit and a second contact for connecting the first and second time constant circuits to the pulse-generating section, and there are further provided at least two display devices including a first display device for indicating a length of time previously set by the time-setting section with a decimal point included and a second display device for indicating a digit of lower order than that indicated by the first display device; and means for causing the first display device to indicate a decimal point when said second contact is closed.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |