Patent US4825968A successfully refreshed from Google Patents.
US4825968A
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US
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Balance based on the principle of the electromagnetic compensation of force with optical position sensor
Assignee: Sartorius AG
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Filing: 1987-12-22
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Granted: 1989-05-02
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Expires: 2007-12-22
Abstract
Abstract There is disclosed a balance based on the principle of the electromagnetic compensation of force with a cylindrical permanent magnet system, with a magnet cover and with a coil for generating the counteracting force that an emitter and a receiver of the optical position sensor be housed inside the magnet cover. The slit diaphragm of the optical position sensor, which extends from below into the area between emitter and receiver, then forms a compact unit with a carrier, e.g., the end of a translation lever, and with a coil and mutual shifts at temperature changes and temperature gradients occur only to a minimal extent.
Inventors
- 👤 Gunther Maaz
- 👤 Udo Wedeken
- 👤 Eduard Bierich
- 👤 Eberhard Stadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:18
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/48; G01G7/00; G01G7/02; G01G7/04; Y; Y10; Y10S; Y10S177/00; Y10S177/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
In a balance on the principle of electromagnetic compensation of force with a cylindrical permanent magnet system having an air gap, a magnet cover which consists at least partially of a material with a high permeability and has the function of magnetically screening the permanent magnet system, a coil in the air gap of the permanent magnet system for generating a load-dependent counteracting force, an optical position sensor coupled to an automatic gain control amplifier for regulating current through the coil, an emitter and a receiver of the optical position sensor being separately mounted and housed inside the magnet cover, and fastening means for securement and adjustment of the optical position sensor in the magnet cover.
Claim 2
Dependent Claim
116 words
In a balance on the principle of electromagnetic compensation of force with a cylindrical permanent magnet system having an air gap, a magnet cover which consists at least partially of a material with a high permeability and has the function of magnetically screening the permanent magnet system, a coil in the air gap of the permanent magnet system for generating a load-dependent counteracting force, an optical position sensor coupled to an automatic gain control amplifier for regulating current through the coil, an emitter and a receiver of the optical position sensor being separately mounted and housed inside the magnet cover, and fastening means for securement and adjustment of the optical position sensor in the magnet cover.
Claim 3
Dependent Claim
13 words
Balance according to claim 1, wherein the magnet cover comprises a central perforation.
Claim 4
Dependent Claim
28 words
Balance according to claim 2, wherein the magnet cover additionally comprises a slit along a diameter or offset so slightly laterally that it still meets the central perforation.
Claim 5
Dependent Claim
40 words
Balance according to claim 1, wherein the magnet cover comprises a slit approximately along a diameter and that this slit is sunk so deeply in the center of the magnet cover that a through opening is produced at this point.
Claim 6
Dependent Claim
30 words
Balance according to claim 1, wherein the magnet cover comprises a central perforation and two radial bores which run from opposite points of the outer edge to the central perforation.
Claim 7
Dependent Claim
46 words
Balance according to claim 1, wherein the magnet cover comprises a central perforation, a slit along a diameter or offset so slightly laterally that it still meets the central perforation and comprises a radial bore vertical to the slit which bore terminates in the central perforation.
Claim 8
Dependent Claim
33 words
Balance according to claim 6, wherein the radial bore does not run in the middle of the magnet cover but rather is offset in the direction of the upper or lower limiting plane.
Claim 9
Dependent Claim
17 words
Balance according to claim 7, wherein the radial bore cuts the upper or the lower limiting plane.
Claim 10
Dependent Claim
17 words
Balance according to claim 8, wherein the magnet cover consists entirely of a material with high permeability.
Claim 11
Dependent Claim
29 words
Balance according to claim 8, wherein the magnet cover consists of any material desired and carries a layer of a material with high permeability on the one limiting plane.
Claim 12
Dependent Claim
45 words
Balance according to claim 10, wherein a carrier extends approximately along a diameter at least partially through the permanent magnet system and carries the coil on its top or its bottom and carries the slit diaphragm of the optical position sensor on the opposite side.
Claim 13
Dependent Claim
38 words
Balance according to claim 11, wherein the carrier is designed as a bent punch part with U-shaped cross section, whereby the slit diaphragm of the optical position sensor is formed by the prolongation of one of the shanks.
Claim 14
Dependent Claim
11 words
Balance according to claim 11, wherein the carrier consists of ceramics.
Claim 15
Dependent Claim
79 words
Balance according to claim 1, wherein the optical position sensor is disposed and mounted in a part having an outer cylindrical surface adjacent to an opening in the magnet cover, two spatially disposed plate bars in the part for supporting the emitter and the receiver, the part having the cylindrical surface fitting into a corresponding mating and receiving perforation in the magnet cover, and the fastening means providing for securement and adjustment of the part in the magnet cover.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |