US3568008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic switching device utilizing stray magnetic flux
Assignee: Omron Corp
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Filing: 1969-04-25
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Granted: 1971-03-02
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Expires: 1989-04-25
Abstract
Abstract This invention relates to electromagnetic devices for driving electric switches or various mechanical means such as a ratchet or a valve. The electromagnetic device of the present invention comprises at least one winding for generating magnetic flux, one stator core magnetically coupled with the said winding, and a movable armature which is attracted to the core when the magnetic flux is generated; and is characterized in that at least one magnetically responsive switching means for controlling the said magnetic flux upon receiving stray magnetic flux is provided in a position where the said switching means receives the stray magnetic flux developed by existence of a gap or gaps between the armature and the stator core. The electromagnetic device of the present invention can be made considerably smaller in size as well as requiring a smaller driving current than conventional devices, and has higher reliability. A delayed set operation is easily obtainable in the electromagnetic device of this invention.
Inventors
- 👤 Shigeru Tanimura
- 👤 Kenzo Kamei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:24
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01F7/16; H01F7/1607; H01F7/18; H01F7/1805; H01F7/1833; H01H43/00; H01H43/02; H01H43/04; H01H50/00; H01H50/54; H01H50/541; H01H51/00; H01H51/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
An electromagnetic device comprising at least one winding for generating a magnetic flux in response to a current applied through a circuit from an energizing source thereto, a stator core magnetically coupled with the said winding, a movable armature which is attracted to the core when a maximum level of magnetic flux is generated and held in contact with said core when a minimum level of magnetic flux is generated, at least one magnetically responsive means connected with the circuit supplying current from said source to said winding and responsive to said magnetic flux for switchably controlling the current applied to said winding to adjust said magnetic flux from a minimum level to a maximum level, said switching means being positioned to receive the stray magnetic flux developed by existence of a gap between the armature and the stator core.
Claim 2
Dependent Claim
140 words
An electromagnetic device comprising at least one winding for generating a magnetic flux in response to a current applied through a circuit from an energizing source thereto, a stator core magnetically coupled with the said winding, a movable armature which is attracted to the core when a maximum level of magnetic flux is generated and held in contact with said core when a minimum level of magnetic flux is generated, at least one magnetically responsive means connected with the circuit supplying current from said source to said winding and responsive to said magnetic flux for switchably controlling the current applied to said winding to adjust said magnetic flux from a minimum level to a maximum level, said switching means being positioned to receive the stray magnetic flux developed by existence of a gap between the armature and the stator core.
Claim 3
Dependent Claim
70 words
An electromagnetic device as defined in claim 1, wherein the said magnetically responsive switching means is in series with said winding and comprises at least one pair of reed contacts of magnetic metal, of which at least one is resilient so as to enable it to be attracted by and contact the other reed contact when a magnetic flux surrounds them, and an airtight enclosure for enclosing the reed contacts.
Claim 4
Dependent Claim
34 words
An electromagnetic device as defined in claim 2, wherein an arc-suppressing circuit consisting of at least one resistor and at least one capacitor is connected across the contacts of said magnetically responsive switching means.
Claim 5
Dependent Claim
18 words
An electromagnetic device as defined in claim 2, wherein the airtight enclosure is filled with a viscous fluid.
Claim 6
Dependent Claim
38 words
An electromagnetic device as defined in claim 2 wherein a second winding capable of generating only said minimum level of magnetic flux is connected across the series combination of said one winding and said magnetically responsive switching means.
Claim 7
Dependent Claim
23 words
An electromagnetic device as defined in claim 2 wherein a current-limiting resistor is connected across the contacts of said magnetic responsive switching means.
Claim 8
Dependent Claim
108 words
An electromagnetic device as defined in claim 1, wherein the stator core and the armature form a plunger-type electromagnetic device, and the said magnetically responsive switching means is placed in a hollow formed in a wall of a housing which encloses the said core, said armature and said winding, said switching means being connected in series with said winding and comprising at least one pair of reed contacts of magnetic metal of which at least one is resilient so as to enable it to be attracted by and contact the other reed contact when a magnetic flux surrounds them, and an airtight enclosure for enclosing the reed contacts.
Claim 9
Dependent Claim
34 words
An electromagnetic device as defined in claim 7, wherein an arc-suppressing circuit consisting of at least one resistor and at least one capacitor is connected across the contacts of the magnetically responsive switching means.
Claim 10
Dependent Claim
27 words
An electromagnetic device as defined in claim 1, wherein the said magnetically responsive switching means is placed in a hollow formed in a spool of the winding.
Claim 11
Dependent Claim
49 words
An electromagnetic device as defined in claim 1, wherein the stator core and the armature form a plunger-type electromagnetic device and the said magnetically responsive switching means is placed in a hollow formed in a wall of a housing which encloses the said core, said armature and said winding.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |