US3825908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state switch structure
Assignee: Illinois Tool Works Inc
•
Filing: 1973-02-02
•
Granted: 1974-07-23
•
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 saturable magnetic cores. The cores are saturated in the presence of a magnetic field of given strength. A drive wire passes through both cores, and a pair of sense wires pass through both cores but are wound thereabout in opposite directions. The saturation of one of the magnetic cores causes an output signal from one sense wire of one polarity and an output from the other sense wire of the opposite polarity. Moving the magnet from adjacent one saturable magnetic core to adjacent the other saturable core reverses the polarity of the output signals at the sense wires. While moving the magnet between saturable magnetic cores a point is reached whereupon no output signal is sensed at either sense wire.
Inventors
- 👤 K Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:19
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/45; H03K17/00; H03K17/94; H03K17/965; H03K17/97; H03K2017/9706
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 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, first and second sense windings passing through both said first and said second magnetic cores 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 at a minimum magnitude and said first and second cores are both unsaturated when said magnetic means is positioned at a predetermined intermediate location, said first and said second sense windings providing output signals of a controlled magnitude which have opposite polarities when said first magnetic core is saturated to a controlled degree less than full saturation and output signals of a controlled magnitude which have opposite polarities when said second magnetic core is saturated to a controlled degree less than full saturation wherein said signals produced when said second magnetic core is partially saturated are the inverse with respect to polarity of the corresponding signals produced when said first magnetic core is partially saturated.
Claim 2
Dependent Claim
221 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, first and second sense windings passing through both said first and said second magnetic cores 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 at a minimum magnitude and said first and second cores are both unsaturated when said magnetic means is positioned at a predetermined intermediate location, said first and said second sense windings providing output signals of a controlled magnitude which have opposite polarities when said first magnetic core is saturated to a controlled degree less than full saturation and output signals of a controlled magnitude which have opposite polarities when said second magnetic core is saturated to a controlled degree less than full saturation wherein said signals produced when said second magnetic core is partially saturated are the inverse with respect to polarity of the corresponding signals produced when said first magnetic core is partially saturated.
Claim 3
Dependent Claim
106 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 both said first and said second magnetic cores and said second sense winding is wound in a second direction which is opposite to said first direction through both said first and said second magnetic cores.
Claim 4
Dependent Claim
41 words
The switch of claim 2 further comprising bistable means wherein said first sense winding is coupled to the set input terminal of said bistable means and said second sense winding is coupled to the reset input terminal of said bistable means.
Claim 5
Dependent Claim
106 words
The switch of claim 3 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 both said first and said second magnetic cores and said second sense winding is wound in a second direction which is opposite to said first direction through both said first and said second magnetic cores.
References Cited (Backward Citations)
US3175199A
Cited
US3698531A
Cited
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 |