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US3932812A
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US
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Motor speed indicator
Assignee: PERIPHERAL EQUIPMENT CORP
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Filing: 1974-03-20
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Granted: 1976-01-13
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Expires: 1994-03-20
Abstract
Abstract Apparatus for indicating when a change has taken place in a desired operating condition of a device using retriggerable multivibrators which are adjusted to represent particular periods with respect to the desired operating rate of the device. In the case of a motor, the multivibrators indicate when the motor is operating at, below or above a desired operating speed.
Inventors
- 👤 Lee J. Milligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:35
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/56; G01P3/60; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/106; G01R; G01R31/00; G01R31/34; G01R31/343
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
Apparatus for indicating whether a motor is operating out of speed, comprising: a slow speed detector; a high speed detector; and an indicator unit; said slow speed detector including a first retriggerable multivibrator having a time period greater than the desired operating speed, and a second retriggerable multivibrator having a time period greater than that of said first multivibrator to provide a slow speed indicator signal for said indicator unit; and said high speed detector including a third retriggerable multivibrator having a time period less than said desired operating speed, a fourth retriggerable multivibrator coupled to said third multivibrator and having a time period greater than said desired operating speed, and a fifth multivibrator coupled to said fourth multivibrator and having a time period greater than that of said fourth multivibrator to provide a high speed indicator signal for said indicator unit.
Claim 2
Dependent Claim
142 words
Apparatus for indicating whether a motor is operating out of speed, comprising: a slow speed detector; a high speed detector; and an indicator unit; said slow speed detector including a first retriggerable multivibrator having a time period greater than the desired operating speed, and a second retriggerable multivibrator having a time period greater than that of said first multivibrator to provide a slow speed indicator signal for said indicator unit; and said high speed detector including a third retriggerable multivibrator having a time period less than said desired operating speed, a fourth retriggerable multivibrator coupled to said third multivibrator and having a time period greater than said desired operating speed, and a fifth multivibrator coupled to said fourth multivibrator and having a time period greater than that of said fourth multivibrator to provide a high speed indicator signal for said indicator unit.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the retriggerable multivibrators are formed by integrated circuits.
Claim 4
Dependent Claim
19 words
Apparatus as defined in claim 2 wherein the first and second multivibrators are formed on a single integrated circuit.
Claim 5
Dependent Claim
20 words
Apparatus as defined in claim 3 wherein the second multivibrator is connected to said indicator unit by an inverting amplifier.
Claim 6
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the time constants of the multivibrators are adjustable.
Claim 7
Dependent Claim
21 words
Apparatus as defined in claim 5 wherein the time constants of the first and second multivibrators are controlled by adjustable resistors.
Claim 8
Dependent Claim
18 words
Apparatus as defined in claim 1 wherein said indicator unit includes separate slow speed and high speed indicators.
Claim 9
Dependent Claim
29 words
Apparatus as defined in claim 1 wherein said slow speed detector and said high speed detector are jointly connected to an out of speed indicator through an OR gate.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |