US3714536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump stroke rate and motor control
Assignee: Gorman Rupp Co
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Filing: 1971-06-17
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Granted: 1973-01-30
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Expires: 1991-06-17
Abstract
Abstract The repetition rate of the stroke of a positive displacement pump is regulated by controlling the current to a ramp generator in the form of a Schmitt trigger. The ramp generator energizes a flip flop which, through a triac, allows the AC motor of the pump to make one revolution whereupon a reed switch closes, changing the state of the flip flop and imposing a short burst of DC on the motor, effectively braking the same.
Inventors
- 👤 A Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:33
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
An electronic control for a motor comprising power means, means generating a ramp signal, control means providing a selective portion of a signal from said power means to said means generating a ramp signal thereby controlling the rate of generation of the ramp signal, bistable circuit means triggered by said means generating a ramp signal, switch means operative upon the triggering of said bistable circuit means and allowing said power means to operate the motor, and means to reset said bistable circuit means in response to a predetermined position of the motor so that said switch means removes said power means from the motor.
Claim 2
Dependent Claim
104 words
An electronic control for a motor comprising power means, means generating a ramp signal, control means providing a selective portion of a signal from said power means to said means generating a ramp signal thereby controlling the rate of generation of the ramp signal, bistable circuit means triggered by said means generating a ramp signal, switch means operative upon the triggering of said bistable circuit means and allowing said power means to operate the motor, and means to reset said bistable circuit means in response to a predetermined position of the motor so that said switch means removes said power means from the motor.
Claim 3
Dependent Claim
104 words
An electronic control for a motor comprising power means, means generating a ramp signal, control means providing a selective portion of a signal from said power means to said means generating a ramp signal thereby controlling the rate of generation of the ramp signal, bistable circuit means triggered by said means generating a ramp signal, switch means operative upon the triggering of said bistable circuit means and allowing said power means to operate the motor, and means to reset said bistable circuit means in response to a predetermined position of the motor so that said switch means removes said power means from the motor.
Claim 4
Dependent Claim
104 words
An electronic control for a motor comprising power means, means generating a ramp signal, control means providing a selective portion of a signal from said power means to said means generating a ramp signal thereby controlling the rate of generation of the ramp signal, bistable circuit means triggered by said means generating a ramp signal, switch means operative upon the triggering of said bistable circuit means and allowing said power means to operate the motor, and means to reset said bistable circuit means in response to a predetermined position of the motor so that said switch means removes said power means from the motor.
Claim 5
Dependent Claim
21 words
An electronic control according to claim 1 further comprising means to brake the motor at a predetermined position of the motor.
Claim 6
Dependent Claim
28 words
An electronic control according to claim 2 further comprising buffer circuitry means isolating said bistable circuit means from said switch means and said means to brake the motor.
Claim 7
Dependent Claim
38 words
An electronic control according to claim 1 wherein said power means includes a source of alternating current to operate the motor and means to rectify said source of alternating current to supply a signal to said control means.
Claim 8
Dependent Claim
15 words
An electronic control according to claim 1 wherein said control means is a variable resistor.
Claim 9
Dependent Claim
31 words
An electronic control according to claim 1 wherein a capacitor is charged by said control means, and said means generating a ramp signal includes a Schmitt trigger fired by said capacitor.
Claim 10
Dependent Claim
16 words
An electronic control according to claim 1 wherein said bistable circuit means is a flip flop.
Claim 11
Dependent Claim
14 words
An electronic control according to claim 1 wherein said switch means is a triac.
Claim 12
Dependent Claim
59 words
An electronic control according to claim 1 wherein said means to reset said bistable circuit includes a second switch means, means located at a predetermined position of the motor to close said second switch means, and a capacitor which is discharged by the closing of said second switch means, the discharging of said capacitor resetting said bistable circuit means.
Claim 13
Dependent Claim
84 words
An electronic control according to claim 2 wherein said means to brake the motor includes a second switch means in parallel with said switch means allowing a rectified portion of the signal from said power means to be imposed on the motor, and a capacitor, said capacitor being charged by a signal from said bistable circuit means after said bistable circuit means has been reset and having a time constant which dictates the duration of the application of said power means to the motor.
Claim 14
Dependent Claim
32 words
An electronic control according to claim 10 wherein said second switch means is an SCR which will only allow a direct current to be imposed on the motor thereby braking the motor.
Claim 15
Dependent Claim
43 words
An electronic motor control according to claim 6 wherein the firing level of said Schmitt trigger is regulated by fluctuations in said power means so as to compensate for changes in the rate of rise of the ramp signal of said Schmitt trigger.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |