Patent US3883839A successfully refreshed from Google Patents.
US3883839A
Expired / Lapsed
US
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Positioning device
Assignee: Bankers Trust Co
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Filing: 1973-10-29
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Granted: 1975-05-13
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Expires: 1993-10-29
Abstract
Abstract An electromagnetic positioning device comprises an armature or actuator movably mounted on a shaft and having a frusto-conical end conforming to a frusto-conical recess in a magnetic pole structure. A coil encompasses the pole structure to draw the armature toward the pole when the coil is energized. A rotatable output shaft is driven by a link connecting it to the actuator and a rotary potentiometer is likewise connected to be driven by the actuator so as to provide means for deriving an electrical signal representative of the angular position of the output shaft.
Inventors
- 👤 William J Barrett
- 👤 Hal G Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
233 words
A positioning device comprising a base formed of magnetizable material having an end portion provided with an opening in the center thereof and a central cup portion extending from said end portion having an interior surface tapering from its free end toward said end portion, a coil housing of magnetizable material extending from said end portion and having a central opening at its end remote from said end portion, an annular actuating coil supported between said end portion and said end of said coil housing remote from said end portion, an actuator shaft mounted in said opening in said end with its longitudinal center line passing through the center line of said central cup Interior and said central opening in said coil housing, a hollow actuator of magnetizable material encompassing said actuator shaft and tapered at one end whereby its outer surface at said one end conforms to the interior surface of said central cup, a first bushing mounted in said actuator at said tapered end and having rolling bearings engaging said actuator shaft, a second bushing mounted in said actuator at its other end and having rolling bearings engaging said actuator shaft, a spring exerting a force on said actuator to urge said actuator away from said end portion of said base whereby the actuator is variably positioned along the actuator shaft as a function of the energization state of said coil.
Claim 2
Dependent Claim
233 words
A positioning device comprising a base formed of magnetizable material having an end portion provided with an opening in the center thereof and a central cup portion extending from said end portion having an interior surface tapering from its free end toward said end portion, a coil housing of magnetizable material extending from said end portion and having a central opening at its end remote from said end portion, an annular actuating coil supported between said end portion and said end of said coil housing remote from said end portion, an actuator shaft mounted in said opening in said end with its longitudinal center line passing through the center line of said central cup Interior and said central opening in said coil housing, a hollow actuator of magnetizable material encompassing said actuator shaft and tapered at one end whereby its outer surface at said one end conforms to the interior surface of said central cup, a first bushing mounted in said actuator at said tapered end and having rolling bearings engaging said actuator shaft, a second bushing mounted in said actuator at its other end and having rolling bearings engaging said actuator shaft, a spring exerting a force on said actuator to urge said actuator away from said end portion of said base whereby the actuator is variably positioned along the actuator shaft as a function of the energization state of said coil.
Claim 3
Dependent Claim
53 words
A positioning device as set forth in claim 1, including a rotatable output shaft and a link acting between said output shaft and said actuator adjacent its said other end whereby movement of said actuator on said actuator shaft upon a change in energization of said coil causes the output shaft to rotate.
Claim 4
Dependent Claim
23 words
A positioning device as set forth in claim 1, including means for deriving a signal representative of a variable controlled by said device.
Claim 5
Dependent Claim
58 words
A positioning device as set forth in claim 1, including a potentiometer having a rotatable input shaft, an arm acting between said input shaft and said actuator adjacent its said other end whereby movement of said actuator upon a change in energization of said coil causes said input shaft to rotate to vary the resistance of said potentiometer.
Claim 6
Dependent Claim
72 words
A positioning device as set forth in claim 1, including a housing open at one end encompassing said base and said coil housing with its closed end covering said base, a housing cover having an open end confronting said open end of said housing, a closed end, said closed end of said housing cover provided with a central recess and wherein one end of said actuator shaft is received in said recess.
Claim 7
Dependent Claim
52 words
A positioning device as set forth in claim 5, including a rotatable output shaft and a link acting between said output shaft and said actuator adjacent its said other end whereby movement of said actuator on said actuator shaft upon a change in energization of said coil causes the shaft to rotate.
Claim 8
Dependent Claim
58 words
A positioning device as set forth in claim 6, including a potentiometer having a rotatable input shaft, an arm acting between said input shaft and said actuator adjacent its said other end whereby movement of said actuator upon a change in energization of said coil causes said input shaft to rotate to vary the resistance of said potentiometer.
Claim 9
Dependent Claim
62 words
A positioning device as set forth in claim 7, whereby said output shaft is rotatably mounted in said housing cover on one side thereof and is spaced from the longitudinal center line of said actuator shaft and wherein said potentiometer is mounted in said housing cover on another side thereof and is spaced from the longitudinal center line of said actuator shaft.
Claim 10
Dependent Claim
57 words
A positioning device as set forth in claim 8, wherein said housing cover is releasably attached to said housing so as to permit it to be mounted in any one of a plurality of positions whereby said output shaft may extend transversely to the longitudinal axis of said actuator shaft in any of a plurality of directions.
Claim 11
Dependent Claim
26 words
A positioning device as set forth in claim 9, including an electrical connection housing whereby electrical connections may be made to the interior of the housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |