US3894283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic locator including sensors mounted in longitudinal grooves of a tubular support
Assignee: Schonstedt Instrument Co LLC
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Filing: 1972-11-03
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Granted: 1975-07-08
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Expires: 1992-11-03
Abstract
Abstract A magnetic locator in which flux-gate sensors are mounted in longitudinal notches or grooves at the ends of a tubular support to form an assembly which is inserted into a tubular housing, the sensors being press-fitted into the notches and the tubular support being provided with spaced bushings of material which is compressed when inserted into the housing. A stiff hairpin excitation conductor extends through the sensors and through the tubular support, being preassembled with one of the sensors. A simplified electrical circuit is employed which produces a beat frequency signal when a magnetic object is located and which avoids the need for a voltage to frequency converter.
Inventors
- 👤 Erick O Schonstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:15
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/081; G01R; G01R33/00; G01R33/02; G01R33/04; G01V3/15
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
Magnetic detecting apparatus comprising a tubular support of substantially circular cross-section having each end cut awAy along longitudinal and transverse planes at a side thereof, respectively, to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, each groove having substantially parallel longitudinal edges in said longitudinal plane terminating at said transverse plane, and a substantially cylindrical magnetic sensor mounted in each groove, the cross-dimensions of the sensors being correlated with the cross-dimensions of the associated grooves, so that each sensor has a snap-fit in the associated groove and is held snugly therein by the frictional embrace of the groove.
Claim 2
Dependent Claim
104 words
Magnetic detecting apparatus comprising a tubular support of substantially circular cross-section having each end cut awAy along longitudinal and transverse planes at a side thereof, respectively, to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, each groove having substantially parallel longitudinal edges in said longitudinal plane terminating at said transverse plane, and a substantially cylindrical magnetic sensor mounted in each groove, the cross-dimensions of the sensors being correlated with the cross-dimensions of the associated grooves, so that each sensor has a snap-fit in the associated groove and is held snugly therein by the frictional embrace of the groove.
Claim 3
Dependent Claim
16 words
Apparatus in accordance with claim 1, wherein said tubular support is received within a tubular housing.
Claim 4
Dependent Claim
21 words
Apparatus in accordance with claim 2, wherein the tubular support is spaced from the tubular housing by a plurality of bushings.
Claim 5
Dependent Claim
20 words
Apparatus in accordance with claim 3, wherein each bushing comprises a strip of foam material wrapped around said tubular support.
Claim 6
Dependent Claim
108 words
A magnetic detector sub-assembly comprising an elongated non-magnetic tube of substantially circular cross-section having each end cut away along longitudinal and transverse planes at a side thereof, respectively, to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, each groove having substantially parallel longitudinal edges in said longitudinal plane terminating at said transverse plane, the depth of each groove being slightly greater than the inner radius of said tube, whereby a substantially cylindrical magnetic sensor having cross-dimensions correlated with the cross-dimensions of the associated groove may be snapped into the associated groove and held snugly therein by the frictional embrace of the groove.
Claim 7
Dependent Claim
108 words
A magnetic detector sub-assembly comprising an elongated non-magnetic tube of substantially circular cross-section having each end cut away along longitudinal and transverse planes at a side thereof, respectively, to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, each groove having substantially parallel longitudinal edges in said longitudinal plane terminating at said transverse plane, the depth of each groove being slightly greater than the inner radius of said tube, whereby a substantially cylindrical magnetic sensor having cross-dimensions correlated with the cross-dimensions of the associated groove may be snapped into the associated groove and held snugly therein by the frictional embrace of the groove.
Claim 8
Dependent Claim
78 words
A magnetic detector sub-assembly comprising an elongated non-magnetic tube having each end cut away at a side thereof to form longitudinal grooves at each end of the tube, the grooves being substantially semi-circular in cross-section for receiving and holding substantially cylindrical magnetic sensors therein, one of the grooves being open at one side of the support and the other of the grooves being open at the opposite side of the support, thereby to equalize stresses in the support.
Claim 9
Dependent Claim
78 words
A magnetic detector sub-assembly comprising an elongated non-magnetic tube having each end cut away at a side thereof to form longitudinal grooves at each end of the tube, the grooves being substantially semi-circular in cross-section for receiving and holding substantially cylindrical magnetic sensors therein, one of the grooves being open at one side of the support and the other of the grooves being open at the opposite side of the support, thereby to equalize stresses in the support.
Claim 10
Dependent Claim
83 words
Magnetic detecting apparatus comprising a tubular support of substantially circular cross-section having each end cut away at a side thereof to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, and a substantially cylindrical magnetic sensor mounted in each groove and embraced snugly by the groove, one of the grooves being open at one side of the support and the other groove being open at the opposite side of the support, thereby to equalize stresses in the support.
Claim 11
Dependent Claim
83 words
Magnetic detecting apparatus comprising a tubular support of substantially circular cross-section having each end cut away at a side thereof to form a longitudinal groove of substantially semi-circular cross-section at each end of the support, and a substantially cylindrical magnetic sensor mounted in each groove and embraced snugly by the groove, one of the grooves being open at one side of the support and the other groove being open at the opposite side of the support, thereby to equalize stresses in the support.
Claim 12
Dependent Claim
58 words
Magnetic detecting apparatus comprising a tubular support having each end cut away at a side thereof to form a longitudinal groove at each end of the support, a magnetic sensor mounted in each groove, and a magnetic field excitation wire extending in sequence through one sensor, through said support, through the other sensor, and reversely along said support.
Claim 13
Dependent Claim
58 words
Magnetic detecting apparatus comprising a tubular support having each end cut away at a side thereof to form a longitudinal groove at each end of the support, a magnetic sensor mounted in each groove, and a magnetic field excitation wire extending in sequence through one sensor, through said support, through the other sensor, and reversely along said support.
Claim 14
Dependent Claim
20 words
Apparatus in accordance with claim 8, wherein said sensors have signal conductors extending along the outside of said tubular support.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |