Patent US3745448A successfully refreshed from Google Patents.
US3745448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal magnetoelastic transducer for measuring mechanical forces
Assignee: Yaskawa Electric Corp
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Filing: 1972-03-30
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Granted: 1973-07-10
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Expires: 1992-03-30
Abstract
Abstract A device for measuring rather heavy compressive loads applied axially on the annular flat surfaces of a wound type magnetic core, comprising, in addition to the wound type magnetic core, at least one active coil wound in a plane perpendicular to the axis of the magnetic core through a corresponding number of first holes bored radially in the magnetic core, at least one compensating coil wound in a plane parallel to the axis of the magnetic core through a corresponding number of second holes bored radially in the magnetic core at positions sufficiently separated from the first holes, means for applying a constant voltage to each of said active coils and compensating coils, and means for measuring a difference, caused by the application of a load to the magnetic core, between the currents flowing through the active and compensating coils.
Inventors
- 👤 Y Goto
- 👤 Y Ogata
- 👤 M Ono
- 👤 K Hiwatashi
- 👤 T Mizoguchi
- 👤 M Hiratsuka
- 👤 J Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:46
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/12; G01L1/127; G01L1/125
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
A load measuring device comprising a magnetic core formed by winding a belt of magnetic material in clockspring fashion into a toroidal shape with a central axis, at least one active coil wound in a plane perpendicular to said axis through a corresponding number of first holes bored radially in the magnetic core, at least one compensating coil wound in a plane parallel to the axis through a corresponding number of second holes bored radially in the magnetic core at positions circumferentially spaced from the first holes, means for applying a constant voltage to each of said coils thereby to cause a current to flow therethrough and means for measuring a difference, caused by an application of a load to the magnetic core, between the currents flowing through the active and compensating coils.
Claim 2
Dependent Claim
133 words
A load measuring device comprising a magnetic core formed by winding a belt of magnetic material in clockspring fashion into a toroidal shape with a central axis, at least one active coil wound in a plane perpendicular to said axis through a corresponding number of first holes bored radially in the magnetic core, at least one compensating coil wound in a plane parallel to the axis through a corresponding number of second holes bored radially in the magnetic core at positions circumferentially spaced from the first holes, means for applying a constant voltage to each of said coils thereby to cause a current to flow therethrough and means for measuring a difference, caused by an application of a load to the magnetic core, between the currents flowing through the active and compensating coils.
Claim 3
Dependent Claim
84 words
A load measuring device as set forth in claim 1 wherein there are a plurality of active coils and a plurality of compensating coils and wherein said active coils are connected in series to form one group of active coils and said compensating coils are connected in series to form one group of compensating coils, and a difference between the voltages obtained across the group of series connected active coils and the group of series connected compensating coils is measured by the measuring means.
Claim 4
Dependent Claim
84 words
A load measuring device as set forth in claim 1 wherein there are a plurality of active coils and a plurality of compensating coils and wherein said active coils are connected in parallel to form one group of active coils and said compensating coils are connected in parallel to form one group of compensating coils, and a difference between the voltages obtained across the group of parallel connected active coils and the group of parallel connected compensating coils is measured by the measuring means.
Claim 5
Dependent Claim
47 words
A load measuring device as set forth in claim 1 wherein there are a plurality of active coils and a plurality of compensating coils and wherein several of the active coils and the same number of compensating coils are connected in opposite arms of a bridge circuit.
Claim 6
Dependent Claim
49 words
A load measuring device as set forth in claim 1 wherein there are a plurality of active coils and a plurality of compensating coils and wherein said active coils are arranged in pairs and said compensating coils are arranged in pairs the pairs being circumferentially spaced from one another.
Claim 7
Dependent Claim
152 words
A load measuring device comprising a magnetic core formed by winding a belt of magnetic material in clockspring fashion into a toroidal shape with a central axis, at least one pair of transformer coupled active coils wound in a plane perpendicular to said axis through a corresponding number of first holes bored radially in the magnetic core, at least one pair of transformer coupled compensating coils wound in a plane parallel to the axis through a corresponding number of second holes bored radially in the magnetic core at positions circumferentially spaced from the first holes, means for applying a constant voltage to the primary winding of each of said coil pairs thereby to cause a current to flow therethrough and means for measuring a difference, caused by an application of a load to the magnetic core, between the currents flowing through the secondary winding of each of said active and compensating coils.
Claim 8
Dependent Claim
152 words
A load measuring device comprising a magnetic core formed by winding a belt of magnetic material in clockspring fashion into a toroidal shape with a central axis, at least one pair of transformer coupled active coils wound in a plane perpendicular to said axis through a corresponding number of first holes bored radially in the magnetic core, at least one pair of transformer coupled compensating coils wound in a plane parallel to the axis through a corresponding number of second holes bored radially in the magnetic core at positions circumferentially spaced from the first holes, means for applying a constant voltage to the primary winding of each of said coil pairs thereby to cause a current to flow therethrough and means for measuring a difference, caused by an application of a load to the magnetic core, between the currents flowing through the secondary winding of each of said active and compensating coils.
Claim 9
Dependent Claim
26 words
A load measuring device as set fortH in claim 1 wherein supporting rings are provided on the inner and outer peripheral surfaces of said magnetic core.
Claim 10
Dependent Claim
27 words
A load measuring device as set forth in claim 7 wherein pressure receiving rings are also provided on the top and bottom surfaces of said magnetic core.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |