Patent US3825909A successfully refreshed from Google Patents.
US3825909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state switch structure
Assignee: Illinois Tool Works Inc
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Filing: 1973-02-02
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Granted: 1974-07-23
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Expires: 1993-02-02
Abstract
Abstract The embodiment of the invention disclosed herein is directed to a solid state switch structure which includes first and second spaced apart closed magnetic core structures. The cores are saturated in the presence of a magnetic field of given field strength. Drive wire means pass through the cores and a pair of sense wires pass through both cores to receive pulse signal information from the drive wire when one or both of the cores is in an unsaturated condition. The saturation of one core provides an output signal from one sense wire and no output signal from the other sense wire while saturation of the other core reverses the output signals from the different sense wire. Movement of the magnetic member from registry with one core to registry with another core will provide mechanically hysteresis. This is accomplished by positioning the magnet and cores in such a manner that a finite movement of the magnet is at all times required between the on and off conditions of the switch.
Inventors
- 👤 K Engstrom
- 👤 V Bernin
- 👤 G Bury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/97
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
232 words
An electrical switch comprising first and second spaced-apart saturable magnetic cores, a drive winding passing through said first and said second magnetic cores for receiving a single polarity input signal, a first sense winding passing through said first magnetic core, a second sense winding passing through said second magnetic core and magnetic means movable adjacent said first and second magnetic cores which is capable of saturating either said first magnetic core or said second magnetic core to a controlled degree according to its proximity thereto, said drive winding and said first and second sense windings being wound so that the signals induced in the said first and second sense windings are both at a minimum magnitude and said first and second cores are both saturated when said magnetic means is positioned at a predetermined intermediate location, said first sense winding provides output signals of a controlled magnitude which have a given polarity when said first magnetic core is saturated to a controlled degree less than full saturation and said second sense winding provides output signals of a controlled magnitude which are of said given polarity when said second magnetic core is saturated to a controlled degree less than full saturation and bistable means having set and reset input terminals, said first sense winding being coupled to its set input terminal and said second sense winding being coupled to its reset input terminal.
Claim 2
Dependent Claim
232 words
An electrical switch comprising first and second spaced-apart saturable magnetic cores, a drive winding passing through said first and said second magnetic cores for receiving a single polarity input signal, a first sense winding passing through said first magnetic core, a second sense winding passing through said second magnetic core and magnetic means movable adjacent said first and second magnetic cores which is capable of saturating either said first magnetic core or said second magnetic core to a controlled degree according to its proximity thereto, said drive winding and said first and second sense windings being wound so that the signals induced in the said first and second sense windings are both at a minimum magnitude and said first and second cores are both saturated when said magnetic means is positioned at a predetermined intermediate location, said first sense winding provides output signals of a controlled magnitude which have a given polarity when said first magnetic core is saturated to a controlled degree less than full saturation and said second sense winding provides output signals of a controlled magnitude which are of said given polarity when said second magnetic core is saturated to a controlled degree less than full saturation and bistable means having set and reset input terminals, said first sense winding being coupled to its set input terminal and said second sense winding being coupled to its reset input terminal.
Claim 3
Dependent Claim
98 words
The switch of claim 1 wherein said magnetic means is a permanent magnet having north and south poles with its north pole facing said first magnetic core and its south pole facing said second magnetic core, said drive winding is wound in a first direction through said first magnetic core and in an opposite direction through said second magnetic core, said first sense winding is wound in a first direction through said first magnetic core and said second sense winding is wound in a second direction which is opposite to said first direction through said second magnetic core.
Claim 4
Dependent Claim
89 words
The switch of claim 1 wherein said magnetic means comprise first and second permanent magnets and said electrical switch comprises a toggle lever having first and second arms and a pivot point located intermediate said arms, each of said permanent magnets being secured to one of said arms so that the proximity of said first magnet to said first core increases from said intermediate location as the proximity of said second magnet to said second core decreases, and vice versa, in accordance with the position of said toggle lever.
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |