US3755767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductance device
Assignee: Motors Liquidation Co
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Filing: 1972-12-15
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Granted: 1973-08-28
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Expires: 1992-12-15
Abstract
Abstract In an electronic fuel injection system, a transducer for converting a variable pressure signal to a variable inductance comprises an inductive coil surrounding an axially reciprocable, magnetically permeable plunger. Two opposing sides of one end of the plunger are asymmetrically tapered; and a magnetically permeable flux member attached to the coil has portions adjacent the untapered end of the plunger and both sides of the tapered end of the plunger to create parallel flux paths through the plunger, each of which has a gap defined by one of the tapered sides and has a reluctance which varies with axial movement of the plunger. The portion of the flux member adjacent one side of the tapered end is transversely movable with respect to the plunger by a torque arm and adjusting screw so as to vary the slope of the inductance-plunger position curve.
Inventors
- 👤 R Hendrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01F1/383; F; F02; F02D; F02D41/00; F02D41/30; G01L; G01L9/00; G01L9/0041; G01L9/007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable in the hole, one end of the plunger being tapered on at least one side thereof; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having a first portion adjacent the tapered end of the plunger and a second portion adjacent the other end of the plunger whereby a magnetic flux path is created through the flux member and plunger which varies the inductance of the coil with the axial position of the plunger, the flux member also having a third portion, which third portion comprises a torque arm projecting from the first portion of the flux member, the torque aRm being effective, when biased in one direction, to deform the flux member so that the first portion moves transversely with respect to the plunger to further vary the inductance of the coil; and a member adjustable with respect to the coil, the adjustable member being engageable with the torque arm and effective, when adjusted, to bias the torque arm in the one direction.
Claim 2
Dependent Claim
193 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable in the hole, one end of the plunger being tapered on at least one side thereof; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having a first portion adjacent the tapered end of the plunger and a second portion adjacent the other end of the plunger whereby a magnetic flux path is created through the flux member and plunger which varies the inductance of the coil with the axial position of the plunger, the flux member also having a third portion, which third portion comprises a torque arm projecting from the first portion of the flux member, the torque aRm being effective, when biased in one direction, to deform the flux member so that the first portion moves transversely with respect to the plunger to further vary the inductance of the coil; and a member adjustable with respect to the coil, the adjustable member being engageable with the torque arm and effective, when adjusted, to bias the torque arm in the one direction.
Claim 3
Dependent Claim
115 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable in the hole, one end of the plunger being asymmetrically tapered on two or more sides thereof; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having one portion adjacent each of the tapered sides of the tapered end of the plunger and a further portion adjacent the other end of the plunger whereby a pair of parallel flux paths are created through the plunger and the separate portions of the flux member to vary the inductance of the coil with axial movement of the plunger.
Claim 4
Dependent Claim
115 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable in the hole, one end of the plunger being asymmetrically tapered on two or more sides thereof; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having one portion adjacent each of the tapered sides of the tapered end of the plunger and a further portion adjacent the other end of the plunger whereby a pair of parallel flux paths are created through the plunger and the separate portions of the flux member to vary the inductance of the coil with axial movement of the plunger.
Claim 5
Dependent Claim
33 words
The variable inductance device of claim 2 wherein the one end of the plunger has a taper on one side that is both longer and deeper than the taper on the other side.
Claim 6
Dependent Claim
260 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable within the hole, one end of the plunger being asymmetrically tapered on opposing sides thereof, the taper on one side being longer and deeper than the taper on the other side; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having a first portion adjacent the one side of the tapered end of the plunger, a second portion adjacent the other side of the tapered end of the plunger and a third portion adjacent the other end of the plunger whereby parallel flux paths are created, one including the first portion of the flux member and the other including the second portion of the flux member, each of the flux paths being dominant in determining the rate of change of inductance of the coil over a different range of axial positions of the plunger, the flux member also having a fourth portion projecting from the second portion thereof, which fourth portion comprises a torque arm effective, when biased in one direction, to deform the flux member so that the second portion moves transversely with respect to the plunger to further vary the inductance of the coil in the range of axial plunger positions in which the second portion is dominant; and a member adjustable with respect to the coil, the adjustable member being engageable with the torque arm and effective, when adjusted, to bias the torque arm in the one direction.
Claim 7
Dependent Claim
260 words
A variable inductance device comprising, in combination: an inductive coil with a central axial hole therethrough; a magnetically permeable plunger axially reciprocable within the hole, one end of the plunger being asymmetrically tapered on opposing sides thereof, the taper on one side being longer and deeper than the taper on the other side; a magnetically permeable flux member fixed to the coil on the outside thereof, the flux member having a first portion adjacent the one side of the tapered end of the plunger, a second portion adjacent the other side of the tapered end of the plunger and a third portion adjacent the other end of the plunger whereby parallel flux paths are created, one including the first portion of the flux member and the other including the second portion of the flux member, each of the flux paths being dominant in determining the rate of change of inductance of the coil over a different range of axial positions of the plunger, the flux member also having a fourth portion projecting from the second portion thereof, which fourth portion comprises a torque arm effective, when biased in one direction, to deform the flux member so that the second portion moves transversely with respect to the plunger to further vary the inductance of the coil in the range of axial plunger positions in which the second portion is dominant; and a member adjustable with respect to the coil, the adjustable member being engageable with the torque arm and effective, when adjusted, to bias the torque arm in the one direction.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |