Patent US3742759A successfully refreshed from Google Patents.
US3742759A
Expired / Lapsed
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Mechanical stress detecting device
Assignee: Meidensha Corp
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Filing: 1970-11-13
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Granted: 1973-07-03
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Expires: 1990-11-13
Abstract
Abstract A device for detecting a mechanical stress which comprises a stock of closely laminated magnetic plates, a pair of nonmagneitc retaining plates securely mounted on both ends of the stack of the magnetic plates by means of bolts so as to form a core, four apertures extending through the core an exciting coil passing through a first pair of the apertures and a detecting coil through a second pair of the apertures, the planes of the coils being normal to each other and wherein the core has a monoaxial magnetic anisotropy established by energizing a magnetizing coil passed through said first pair of apertures while the temperature of the stack decreases from the Curie point of the magnetic material.
Inventors
- 👤 K Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:34
CPC Classifications
G; G01; G01N; G01N3/00; G01B; G01B7/00; G01B7/16; G01B7/24; G01L; G01L1/00; G01L1/12; G01L1/125; G01L1/127; G01N3/28; G01N2203/00; G01N2203/02; G01N2203/022; G01N2203/0222; Y; Y10; Y10S; Y10S73/00; Y10S73/02; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
In a device for converting a mechanical stress to an electric quantity, the device including a stack of plates of magnetic material, two retaining plates on the first and last plate of said stack, elongated fastening members fixedly fastening said stack between said retaining plates, whereby said retaining plates and said plates of magnetic material constitute a continuous core, said core being formed with two pairs of openings extending therethrough in a direction from one retaining plate to the other retaining plate, each pair defining a plane intersecting the plane defined by the other pair at right angles, an exciting coil in the openings of one pair, and a detecting coil in the openings of the other pair and intersecting said exciting coil, said stack having monoaxial magnetIc anisotropy, the improvement which comprises two load sharing members having each a thickness substantially greater than the thickness of each of said plates of magnetic material and interposed between said stack and said retaining plates respectively, said plates of magnetic material being in the fully annealed condition and substantially free from internal stresses.
Claim 2
Dependent Claim
181 words
In a device for converting a mechanical stress to an electric quantity, the device including a stack of plates of magnetic material, two retaining plates on the first and last plate of said stack, elongated fastening members fixedly fastening said stack between said retaining plates, whereby said retaining plates and said plates of magnetic material constitute a continuous core, said core being formed with two pairs of openings extending therethrough in a direction from one retaining plate to the other retaining plate, each pair defining a plane intersecting the plane defined by the other pair at right angles, an exciting coil in the openings of one pair, and a detecting coil in the openings of the other pair and intersecting said exciting coil, said stack having monoaxial magnetIc anisotropy, the improvement which comprises two load sharing members having each a thickness substantially greater than the thickness of each of said plates of magnetic material and interposed between said stack and said retaining plates respectively, said plates of magnetic material being in the fully annealed condition and substantially free from internal stresses.
Claim 3
Dependent Claim
43 words
In a device as set forth in claim 1, said load sharing members each consisting of a plurality of plate members superposed in said direction, said plates of magnetic material and said plate members being of the same configuration transverse of said direction.
Claim 4
Dependent Claim
17 words
In a device as set forth in claim 1, said load sharing members consisting of non-magnetic material.
Claim 5
Dependent Claim
38 words
In a device as set forth in claim 1, said stack having two exposed faces parallel to each other and to said direction, and said retaining plates having each two edge faces flush with said exposed faces respectively.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |