US3676819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact-free potentiometer
Assignee: Siemens AG
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Filing: 1969-12-11
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Granted: 1972-07-11
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Expires: 1989-12-11
Abstract
Abstract A stationary elongated armature body and a permanent magnet are connected in a magnetic circuit. A guide plate of non-magnetic material is interposed between the armature body and the magnet. The guide plate is adjacent the armature body and has a recess formed therethrough and a galvanomagnetic resistor is embedded in the recess. The guide plate guides the magnet in gliding relation.
Inventors
- 👤 Werner Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:24
CPC Classifications
H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A contact-free, adjustable semiconductor potentiometer having a plate-shaped, galvanomagnetic semiconductor resistor whose resistance may be determined by shifting a magnetic field in operative proximity therewith, the magnetic field being produced by a magnetic circuit having a permanent magnet and a stationary elongated armature body, said potentiometer comprising a guide plate of non-magnetic material interposed between the magnet and the armature body of the magnetic circuit, said guide plate being adjacent to the armature body and having a recess formed therein and said galvanomagnetic resistor being embedded in said recess, said guide plate guiding the magnet in gliding relation.
Claim 2
Dependent Claim
98 words
A contact-free, adjustable semiconductor potentiometer having a plate-shaped, galvanomagnetic semiconductor resistor whose resistance may be determined by shifting a magnetic field in operative proximity therewith, the magnetic field being produced by a magnetic circuit having a permanent magnet and a stationary elongated armature body, said potentiometer comprising a guide plate of non-magnetic material interposed between the magnet and the armature body of the magnetic circuit, said guide plate being adjacent to the armature body and having a recess formed therein and said galvanomagnetic resistor being embedded in said recess, said guide plate guiding the magnet in gliding relation.
Claim 3
Dependent Claim
33 words
A contact-free potentiometer as claimed in claim 1, wherein said guide plate comprises a U-shaped frame affixed to said armature body and forming a tunnel-like housing therewith enclosing the area of said magnet.
Claim 4
Dependent Claim
23 words
A contact-free potentiometer as claimed in claim 1, wherein said guide plate comprises a brass sheet and is cemented to said armature body.
Claim 5
Dependent Claim
23 words
A contact-free potentiometer as claimed in claim 1, wherein said magnet comprises a permanently magnetic cylindrical rod having a pair of wafer-like poleshoes.
Claim 6
Dependent Claim
26 words
A contact-free potentiometer as claimed in claim 2, wherein said guide plate further comprises a spring bolt mounted between said magnet and abutting against said frame.
Claim 7
Dependent Claim
38 words
A contact-free potentiometer as claimed in claim 2, further comprising a spiral spring in the area enclosed by said frame and abutting an axial end of said magnet whereby the magnet is movable relative to the spiral spring.
Claim 8
Dependent Claim
38 words
A contact-free potentiometer as claimed in claim 6, further comprising a container of substantially hollow cylindrical configuration having a closed bottom base and an open top base and enclosing said potentiometer with said spiral spring adjacent said bottom.
Claim 9
Dependent Claim
41 words
A contact-free potentiometer as claimed in claim 7, further comprising a cover of substantially hollow cylindrical configuration having an open bottom base and a closed top base and adapted to engage said container in a threadlike manner as a micrometer screw.
Claim 10
Dependent Claim
39 words
A contact-free potentiometer as claimed in claim 8, wherein said guide means further comprises a spherical member mounted on the opposite axial end of said magnet between said magnet and said cover and abutting said magnet and said cover.
Claim 11
Dependent Claim
27 words
A contact-free potentiometer as claimed in claim 8, wherein said container has a groove formed therein and said cover has at least one bolt engaging said groove.
Claim 12
Dependent Claim
19 words
A contact-free potentiometer as claimed in claim 8, wherein said cover has a border area on its cylindrical surface.
Claim 13
Dependent Claim
25 words
A contact-free potentiometer as claimed in claim 8, wherein said cover has a recess formed in its top surface adapted to receive an adjusting tool.
Claim 14
Dependent Claim
26 words
A contact-free potentiometer as claimed in claim 8, wherein said cover has a ring shiftably mounted on its cylindrical surface and having a scale division thereon.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |