Patent US4181089A successfully refreshed from Google Patents.
Patent US3700914A successfully refreshed from Google Patents.
US3700914A
Expired / Lapsed
US
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Control apparatus for air conditioning and like systems
Assignee: MERCANTILE TEXAS CREDIT Corp
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Filing: 1970-11-20
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Granted: 1972-10-24
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Expires: 1990-11-20
Abstract
Abstract Control equipment for power-operated mechanism, such as an airconditioning system including circuitry for preventing the operation or re-operation of the compressor or other load until the expiration of a substantial predetermined interval of time after the compressor or load has been released. This equipment will prevent the frequent intermittent operation of the motor of a compressor if, for example, the thermostat or a switch or any other control element were jiggled or moved erratically. This equipment also prevents the operation of the compressor or other load unless, within a second predetermined time interval, the pressure in the supply line feeding fluid to the compressor or load has reached a desired or predetermined pressure. If the predetermined pressure has not been attained, the circuitry will release the compressor motor or load.
Inventors
- 👤 George John Granieri
- 👤 Edward Herbert Lefkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:48
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; H; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
150 words
A regulating system including the combination of a source of power, a load, a switch interconnecting said source with said load to operate said load, means responsive to the operation of said switch to delay the interconnection of said source to said load to operate said load after a predetermined time interval which is sufficiently long as to prevent random intermittent operation of the load, means to prevent the interconnection of said source to said load to re-operate said load while said switch is re-operated during said time interval, and means to prevent the reactivation of said load in response to an interruption of the interconnected circuit during said predetermined time interval, said delay means including a normally non-conductive device to which two D. C. voltages are supplied which rise in magnitudes at different rates to render said device conductive when the D. C. voltage difference reaches a predetermined value.
Claim 2
Dependent Claim
150 words
A regulating system including the combination of a source of power, a load, a switch interconnecting said source with said load to operate said load, means responsive to the operation of said switch to delay the interconnection of said source to said load to operate said load after a predetermined time interval which is sufficiently long as to prevent random intermittent operation of the load, means to prevent the interconnection of said source to said load to re-operate said load while said switch is re-operated during said time interval, and means to prevent the reactivation of said load in response to an interruption of the interconnected circuit during said predetermined time interval, said delay means including a normally non-conductive device to which two D. C. voltages are supplied which rise in magnitudes at different rates to render said device conductive when the D. C. voltage difference reaches a predetermined value.
Claim 3
Dependent Claim
30 words
A regulating network according to claim 1 in which said switch and said delay means also includes a feedback path feeding additional voltage to said device supplied with D.C. voltages.
Claim 4
Dependent Claim
48 words
A regulating network according to claim 1 in which the delay means for said switch includes means to render the delay network responsive over a wide temperature range, said means including a feedback path feeding D.C. voltage between the two electrodes to which the D.C. voltages are applied.
Claim 5
Dependent Claim
131 words
The combination of a source of power a load, switch mechanism interconnecting said source with said load, means responsive to the operation of said switch mechanism to prevent the operation of said load by power from said source during a predetermined time interval after said switch mechanism has been operated, said means including means to prevent the reactivation of said load in response to an inadvertent interruption of the interconnecting circuit during said predetermined time interval, said means including a device which receives two D. C. voltages which rise in magnitudes at different rates and activate the device when the difference between said two D. C. voltages reaches a predeterMined value, said switching mechanism including means for substantially reducing the effect of noise currents on the operation of said switch mechanism.
Claim 6
Dependent Claim
131 words
The combination of a source of power a load, switch mechanism interconnecting said source with said load, means responsive to the operation of said switch mechanism to prevent the operation of said load by power from said source during a predetermined time interval after said switch mechanism has been operated, said means including means to prevent the reactivation of said load in response to an inadvertent interruption of the interconnecting circuit during said predetermined time interval, said means including a device which receives two D. C. voltages which rise in magnitudes at different rates and activate the device when the difference between said two D. C. voltages reaches a predeterMined value, said switching mechanism including means for substantially reducing the effect of noise currents on the operation of said switch mechanism.
Claim 7
Dependent Claim
13 words
The combination of claim 4 in which the switch mechanism includes a thermostat.
Claim 8
Dependent Claim
27 words
The combination of claim 4 in which the noise reducing means comprises a Zener diode in parallel with a resistor for feeding D.C. voltage to the device.
Claim 9
Dependent Claim
120 words
Apparatus for protecting a motor against random start and stop operations after said motor has been connected to its source of power, comprising means including a delay circuit coupling said motor to said source of power to introduce a delay of a predetermined time interval in the operation of said motor, said delay circuit means having means for developing two D.C. voltages which rise in magnitudes at different rates and introduce the delay interval when the difference between said D.C. voltages reaches a predetermined magnitude, means responsive to any interruption of said interconnected circuit to de-activate said motor, and means to prevent the re-activation of said motor if there is any interruption of said interconnected circuit during said predetermined interval.
Claim 10
Dependent Claim
120 words
Apparatus for protecting a motor against random start and stop operations after said motor has been connected to its source of power, comprising means including a delay circuit coupling said motor to said source of power to introduce a delay of a predetermined time interval in the operation of said motor, said delay circuit means having means for developing two D.C. voltages which rise in magnitudes at different rates and introduce the delay interval when the difference between said D.C. voltages reaches a predetermined magnitude, means responsive to any interruption of said interconnected circuit to de-activate said motor, and means to prevent the re-activation of said motor if there is any interruption of said interconnected circuit during said predetermined interval.
Claim 11
Dependent Claim
17 words
Apparatus according to claim 7 in which the apparatus includes a thermostat for responding to temperature variations.
Claim 12
Dependent Claim
79 words
Apparatus for rendering a transistor substantially independent of wide temperature variations, the transistor including first, second and third electrodes, comprising means for applying between the first and second electrodes respective D.C. voltages which rise in magnitudes at different rates, said transistor being rendered conductive when the voltage difference between the first and second electrodes reaches a predetermined value, an output circuit connected between the first and third electrodes, and means for feeding a negative voltage to the second electrode.
Claim 13
Dependent Claim
79 words
Apparatus for rendering a transistor substantially independent of wide temperature variations, the transistor including first, second and third electrodes, comprising means for applying between the first and second electrodes respective D.C. voltages which rise in magnitudes at different rates, said transistor being rendered conductive when the voltage difference between the first and second electrodes reaches a predetermined value, an output circuit connected between the first and third electrodes, and means for feeding a negative voltage to the second electrode.
Claim 14
Dependent Claim
79 words
A delay circuit for introducing delay in the operation of a load, comprising a transistor having first, second and third electrodes, means for applying to the first and second electrodes, respectively, pulses of D.C. current which vary at different rates, the load being connected to a second device, and means for rendering the operation of said delay circuit substantially independent of wide temperature variations, said means including a feedback path for applying a negative voltage to the second electrode.
Claim 15
Dependent Claim
79 words
A delay circuit for introducing delay in the operation of a load, comprising a transistor having first, second and third electrodes, means for applying to the first and second electrodes, respectively, pulses of D.C. current which vary at different rates, the load being connected to a second device, and means for rendering the operation of said delay circuit substantially independent of wide temperature variations, said means including a feedback path for applying a negative voltage to the second electrode.
Claim 16
Dependent Claim
47 words
A delay circuit according to claim 10 including means for rendering the transistor conductive when the voltage applied to the first electrode exceeds that applied to the second electrode by a predetermined amount and for rendering the transistor non-conductive when said voltage is below said predetermined voltage.
Claim 17
Dependent Claim
185 words
A regulating system for an air-conditioner having a compressor to which refrigerating fluid is transmitted and a motor for operating the compressor, comprising switch mechanism interconnecting said motor to its source of power, means responsive to the operation of said switch mechanism to delay the interconnection of said motor to its source of power and thereby to delay the operation of said motor until the expiration of a first predetermined time interval which is sufficiently long so as to prevent random intermittent operation of said motor, said responsive means including a normally non-conductive device to which are supplied two D.C. voltages which rise in magnitudes and which becomes conductive when the difference between the D.C. voltages reaches a predetermined magnitude, and means to prevent the operation of said motor in response to the operation of said switch mechanism during a second predetermined time interval to allow the pressure of the fluid supplied to the compressor to reach a predetermined magnitude and to prevent the connection of said motor to said load in the absence of the pressure of said fluid reaching the said predetermined magnitude.
Claim 18
Dependent Claim
185 words
A regulating system for an air-conditioner having a compressor to which refrigerating fluid is transmitted and a motor for operating the compressor, comprising switch mechanism interconnecting said motor to its source of power, means responsive to the operation of said switch mechanism to delay the interconnection of said motor to its source of power and thereby to delay the operation of said motor until the expiration of a first predetermined time interval which is sufficiently long so as to prevent random intermittent operation of said motor, said responsive means including a normally non-conductive device to which are supplied two D.C. voltages which rise in magnitudes and which becomes conductive when the difference between the D.C. voltages reaches a predetermined magnitude, and means to prevent the operation of said motor in response to the operation of said switch mechanism during a second predetermined time interval to allow the pressure of the fluid supplied to the compressor to reach a predetermined magnitude and to prevent the connection of said motor to said load in the absence of the pressure of said fluid reaching the said predetermined magnitude.
Claim 19
Dependent Claim
39 words
A regulating system according to claim 12 in which each means for introducing a delay of a predetermineD time interval in the operation of said motor includes means to render said delay networks responsive over a wide temperature range.
Claim 20
Dependent Claim
15 words
A regulating system according to claim 12 in which the switch mechanism includes a thermostat.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |