US3595331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic balance
Assignee: Sartorius Werke GmbH
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Filing: 1968-12-04
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Granted: 1971-07-27
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Expires: 1988-12-04
Abstract
Abstract A balance beam adapted to carry a load is mounted on a balance beam support for pivotal deflection on a balance beam aXis from a no-load position in response to said load. Inductive indicating and magnetic compensating means for indicating said load and for an automatic compensation of said pivotal deflection comprise a pair of rotary moving coils secured to said balance beam on opposite sides of said balance beam axis. A pair of stationary permanent magnets, which are carried by said support and each of which is associated with one of said rotary moving coils, and a pair of identical, stationary, framelike field coils carried by said support and adapted to be fed with alternating current. The field coils are each disposed beside and slightly spaced from one of the rotary moving coils associated therewith. Said field coils are symmetrically disposed with respect to said balance beam axis and symmetrically disposed with respect to a reference plane which in said no-load position of said balance beam extends through said balance beam axis and parallel to said balance beam. Said field coils extends transversely to said reference plane.
Inventors
- 👤 Theodor Reinhard Gast
- 👤 Horst Hertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:44
CPC Classifications
G; G01; G01G; G01G7/00; G01G7/02; G01G7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
An electronic balance, which comprises a balance beam support, a balance beam adapted to carry a load and mounted on said support for pivotal deflection on a balance beam axis from a no-load position in response to said load, and inductive indicating and magnetic compensating means for indicating said load and for an automatic compensation of said pivotal deflection, said means comprising at least one pair of moving coils secured to said balance beam and disposed on both sides of said balance beam axis, stationary permanent magnets carried by said support and associated each with one of said moving coils, and at least one pair of identical, stationary, framelike field coils carried by said support and adapted to be fed with alternating current, said field coils being each associated with one of said moving coils and disposed beside and slightly spaced from the moving coil associated therewith, said field coils being symmetrically disposed with respect to said balance beam axis and with respect to a reference plane which in said no-load position of said balance beam extends through said balance beam axis and parallel to said balance beam, said field coils extending transversely to said reference plane.
Claim 2
Dependent Claim
197 words
An electronic balance, which comprises a balance beam support, a balance beam adapted to carry a load and mounted on said support for pivotal deflection on a balance beam axis from a no-load position in response to said load, and inductive indicating and magnetic compensating means for indicating said load and for an automatic compensation of said pivotal deflection, said means comprising at least one pair of moving coils secured to said balance beam and disposed on both sides of said balance beam axis, stationary permanent magnets carried by said support and associated each with one of said moving coils, and at least one pair of identical, stationary, framelike field coils carried by said support and adapted to be fed with alternating current, said field coils being each associated with one of said moving coils and disposed beside and slightly spaced from the moving coil associated therewith, said field coils being symmetrically disposed with respect to said balance beam axis and with respect to a reference plane which in said no-load position of said balance beam extends through said balance beam axis and parallel to said balance beam, said field coils extending transversely to said reference plane.
Claim 3
Dependent Claim
24 words
An electronic balance as set forth in claim 1, in which said moving coils are symmetrically disposed with respect to said balance beam axis.
Claim 4
Dependent Claim
40 words
An electronic balance as set forth in claim 1, in which said balance beam comprises a substantially horizontally extending framework having two spars and rungs connecting said spars, and said moving coils are disposed between and secured to said spars.
Claim 5
Dependent Claim
33 words
An electronic balance as set forth in claim 3, in which said field coils are disposed adjacent to one of said spars on the outside thereof and are curved around said one spar.
Claim 6
Dependent Claim
81 words
An electronic balance as set forth in claim 1, in which said permanent magnets are E-shaped and comprise each two outer legs and an intermediate leg, said outer legs of each of said permanent magnets form like poles, said intermediate leg of each of said permanent magnets forms a pole which is unlike that of said outer legs of the same magnet, said legs are upwardly directed and each of said moving coils surrounds said intermediate leg of the associated magnet.
Claim 7
Dependent Claim
48 words
An electronic balance as set forth in claim 5, in which corresponding legs of both said magnets form like poles, said moving coils are adapted to be fed with direct current in opposite senses, and said field coils are fed with said alternating current in the same sense.
Claim 8
Dependent Claim
48 words
An electronic balance as set forth in claim 5, in which corresponding legs of both said magnets form unlike poles, said moving coils are adapted to be fed with direct current in the same sense, and said field coils are fed with said alternating current in opposite senses.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |