US3594785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic indicator having asymmetrically poled stator
Assignee: Veeder Industries Inc
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Filing: 1969-10-01
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Granted: 1971-07-20
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Expires: 1989-10-01
Abstract
Abstract An indicator is disclosed having a rotor which is able to turn promptly to 180* opposed positions to permit the successive display of diametrically opposed symbols carried on a drum. The position of the rotor drum is governed by a stator having poles projecting inwardly from an annular core. Windings on the poles are arranged to permit the stator to establish any one of a number of differently oriented magnetic fields. The rotor has a permanent magnet which rotates about an axis at the geometric center of the annular core to align itself with the stator''s magnetic field. The poles of the stator are arranged on the annular core in pairs which are not diametrically opposed but are aligned to cause the vector representing the stator''s field to be parallel to and offset from the aligned position taken by the permanent magnet.
Inventors
- 👤 Louis L Orenbuch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:29
CPC Classifications
G; G09; G09F; G09F11/00; G09F11/23
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
In an electromagnetic indicator of the type utilizing a stator having a plurality of poles protruding inwardly from an annular ferromagnetic core, the stator having windings arranged about the poles whereby the stator is capable of establishing any one of a plurality of discretely oriented magnetic fields by selective electrical energization of the windings, and a rotor having a magnet secured to a drum, the rotor being mounted to cause the magnet to pivot about an axis at the geometric center of the annular core whereby the magnet is constrained by the stator''s field to turn to a station providing the path of least reluctance between two poles of the stator, the improvement for assuring the presence of a turning force on the magnet whenever the rotor is required to turn to a 180* opposite station, the improvement residing in the arrangement of poles on the stator wherein the plurality of inwardly protruding poles are disposed in aligned pairs, and each pair of aligned poles extends inwardly from the annular core parallel to and offset from a diametral line.
Claim 2
Dependent Claim
179 words
In an electromagnetic indicator of the type utilizing a stator having a plurality of poles protruding inwardly from an annular ferromagnetic core, the stator having windings arranged about the poles whereby the stator is capable of establishing any one of a plurality of discretely oriented magnetic fields by selective electrical energization of the windings, and a rotor having a magnet secured to a drum, the rotor being mounted to cause the magnet to pivot about an axis at the geometric center of the annular core whereby the magnet is constrained by the stator''s field to turn to a station providing the path of least reluctance between two poles of the stator, the improvement for assuring the presence of a turning force on the magnet whenever the rotor is required to turn to a 180* opposite station, the improvement residing in the arrangement of poles on the stator wherein the plurality of inwardly protruding poles are disposed in aligned pairs, and each pair of aligned poles extends inwardly from the annular core parallel to and offset from a diametral line.
Claim 3
Dependent Claim
71 words
In an electromagnetic indicator of the type according to claim 1 which is further characterized in that each inwardly protruding pole of the stator is surrounded by a winding that can be individually electrically energized, and the rotor magnet has diametrically opposed magnetic poles, which are equidistant from the axis of rotation the improvement according to claim 1, whErein the inward protrusion of the poles of an aligned pair are equal.
Claim 4
Dependent Claim
44 words
In an electromagnetic indicator having the improvement according to claim 1, the improvement further residing in disposing the aligned pole pairs about the annular stator whereby the diametral lines to which the pole pairs are parallel are uniformly angularly spaced around a full circle.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |