US3714538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Velocimeter
Assignee: Milacron Inc
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Filing: 1971-09-13
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Granted: 1973-01-30
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Expires: 1991-09-13
Abstract
Abstract A velocimeter being readily adaptable for measuring the magnitude and direction of velocity of a moving element. A transducer is responsive to the moving element and produces an output signal having frequency variations proportional to the transducer velocity. A circuit is provided for measuring the variations in frequency and producing a DC output signal as a function thereof.
Inventors
- 👤 G Albrecht
- 👤 T Nead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
G; G01; G01P; G01P13/00; G01P13/02; G01P13/04; G01P13/045; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
An apparatus for measuring velocity of a movable element, the apparatus comprising: a. means for producing a number of input signals having a predetermined phase relationship; b. a transducer mechanically coupled to the movable element, said transducer having a number of inputs responsive to the input signals and producing a periodic transducer output signal with frequency variations occurring as a function of a velocity of the movable element; c. means responsive to the transducer output signal for producing a control signal synchronized with the beginning of each period of the transducer output signal; d. means responsive to the control signal for producing a reference signal having a time duration equal to one-half of the period of the transducer output signal with the movable eLement at a zero velocity; e. means responsive to the transducer output signal and the reference signal for producing a pulse width modulated signal representing the magnitude and direction of the velocity of the movable element; and f. means responsive to the pulse width modulated signal for producing a DC output signal representing the magnitude and velocity of the movable element.
Claim 2
Independent Claim
184 words
An apparatus for measuring velocity of a movable element, the apparatus comprising: a. means for producing a number of input signals having a predetermined phase relationship; b. a transducer mechanically coupled to the movable element, said transducer having a number of inputs responsive to the input signals and producing a periodic transducer output signal with frequency variations occurring as a function of a velocity of the movable element; c. means responsive to the transducer output signal for producing a control signal synchronized with the beginning of each period of the transducer output signal; d. means responsive to the control signal for producing a reference signal having a time duration equal to one-half of the period of the transducer output signal with the movable eLement at a zero velocity; e. means responsive to the transducer output signal and the reference signal for producing a pulse width modulated signal representing the magnitude and direction of the velocity of the movable element; and f. means responsive to the pulse width modulated signal for producing a DC output signal representing the magnitude and velocity of the movable element.
Claim 3
Independent Claim
184 words
An apparatus for measuring velocity of a movable element, the apparatus comprising: a. means for producing a number of input signals having a predetermined phase relationship; b. a transducer mechanically coupled to the movable element, said transducer having a number of inputs responsive to the input signals and producing a periodic transducer output signal with frequency variations occurring as a function of a velocity of the movable element; c. means responsive to the transducer output signal for producing a control signal synchronized with the beginning of each period of the transducer output signal; d. means responsive to the control signal for producing a reference signal having a time duration equal to one-half of the period of the transducer output signal with the movable eLement at a zero velocity; e. means responsive to the transducer output signal and the reference signal for producing a pulse width modulated signal representing the magnitude and direction of the velocity of the movable element; and f. means responsive to the pulse width modulated signal for producing a DC output signal representing the magnitude and velocity of the movable element.
Claim 4
Independent Claim
184 words
An apparatus for measuring velocity of a movable element, the apparatus comprising: a. means for producing a number of input signals having a predetermined phase relationship; b. a transducer mechanically coupled to the movable element, said transducer having a number of inputs responsive to the input signals and producing a periodic transducer output signal with frequency variations occurring as a function of a velocity of the movable element; c. means responsive to the transducer output signal for producing a control signal synchronized with the beginning of each period of the transducer output signal; d. means responsive to the control signal for producing a reference signal having a time duration equal to one-half of the period of the transducer output signal with the movable eLement at a zero velocity; e. means responsive to the transducer output signal and the reference signal for producing a pulse width modulated signal representing the magnitude and direction of the velocity of the movable element; and f. means responsive to the pulse width modulated signal for producing a DC output signal representing the magnitude and velocity of the movable element.
References Cited (Backward Citations)
US2979623A
Cited
US3276256A
Cited
US3480859A
Cited
US3527986A
Cited
US3560854A
Cited
US3525017A
Cited
US3543110A
Cited
US3622208A
Cited
US3640586A
Cited
US3657601A
Cited
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 |