Patent US3794901A successfully refreshed from Google Patents.
US3794901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for imparting an alternating rotary motion to a body, about a mechanical axis
Assignee: Thales SA
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Filing: 1972-09-08
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Granted: 1974-02-26
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Expires: 1992-09-08
Abstract
Abstract To a body, imparted in alternating rotary motion about a mechanical axis attached to a fixed support, by a motor, there are fixed the ends of springs whose respective other ends are connected to said fixed support. The springs restore, in the form of kinetic energy, the stored potential energy; the energy to be supplied by the motor in order to sustain the motion, is limited to that required to compensate for friction losses. An angle detector supplies a control signal from a negative feedback loop in the motor supply, the motor supply also comprising an ordinary feedback or reaction loop.
Inventors
- 👤 R Gendreu
- 👤 S Platel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:45
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/02; H01Q3/04; H01Q3/06; G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1445
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A device for imparting an alternating rotary motion to a body about a mechanical axis attached to a fixed support, said device comprising means including a motor for driving said body, a device coupling said motor to said body and a motor control circuit, means for converting potential energy into kinetic energy and vice-versa, said means being connected between said body and said fixed support, and means for sustaining and controlling said motion which comprise a first detector for detecting the angular velocity of said body, a feedback loop in the motor control circuit and coupled to said velocity detector, a second detector for detecting the angular position of said body, a negative feedback loop in the motor control circuit coupled to said position detector and to said velocity detector, and safety means shunted across said feedback loop and coupled to said position detector.
Claim 2
Independent Claim
144 words
A device for imparting an alternating rotary motion to a body about a mechanical axis attached to a fixed support, said device comprising means including a motor for driving said body, a device coupling said motor to said body and a motor control circuit, means for converting potential energy into kinetic energy and vice-versa, said means being connected between said body and said fixed support, and means for sustaining and controlling said motion which comprise a first detector for detecting the angular velocity of said body, a feedback loop in the motor control circuit and coupled to said velocity detector, a second detector for detecting the angular position of said body, a negative feedback loop in the motor control circuit coupled to said position detector and to said velocity detector, and safety means shunted across said feedback loop and coupled to said position detector.
Claim 3
Dependent Claim
63 words
A device as claimed in claim 1 wherein said negative feedback loop comprises a field-effect transistor (Q1) and a negative voltage source, said field-effect transistor being used as a variable resistor, the resistance of which is a function of its bias, said field-effect transistor being coupled by its gate electrode to said negative voltage source and to the output of said position detector.
Claim 4
Dependent Claim
35 words
A device as claimed in claim 1, wherein said safety means comprises a transistor (Q2) utilized as a controlled resistor, said transistor shunted across said feedback loop, its base being coupled to said position detector.
Claim 5
Dependent Claim
52 words
A device as claimed in claim 3, wherein a circuit controlling the starting or stopping of the motion of said body, comprises means for applying to the base of the transistor (Q2) either a pulse blocking said transistor for purpose of starting or a direct voltage which causes said transistor to conduct.
Claim 6
Dependent Claim
37 words
A device as claimed in claim 4, wherein said circuit comprises a direct voltage source, a resistor (R8) and a diode (D) coupled in series between the base of the transistor (Q2) and said direct voltage source.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |