US3569890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bistable magnetic latching relay
Assignee: Individual
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Filing: 1968-12-26
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Granted: 1971-03-09
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Expires: 1988-12-26
Abstract
Abstract A magnetic-latching relay in which an armature is movable between a closed position engaging one end face of a core and an open position spaced from this end face and in which two windings are provided about the core, one of which provides, when energized, a magnetic field moving the armature to closed position and the other, when energized, moving the armature to open position. The relay includes further an annular permanent magnet, surrounding the end portion of the core on which the end face cooperating with the armature is provided, to keep the armature, when brought to the closed position by energizing the one winding, in said closed position even after the one winding is deenergized.
Inventors
- 👤 Ezio Barateili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:35
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/22; H01H51/2236
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A magnetic-latching relay which is maintained stable in closed as well as in open position and comprising a core having an end face and being formed from magnetizable material; an armature located adjacent said end face movable between an open position spaced from said one end face and a closed position engaging the same; a main winding about said core for generating, when energized, a magnetic field which moves said armature to said closed position; an auxiliary winding about said core for generating, when energized, a magnetic field opposite to the field generated by said main winding, said core having at said one end face an end portion projecting beyond said windings; and a ring-shaped permanent magnet surrounding said end face of said core radially spaced therefrom to define an annular gap between said core and said permanent magnet, said permanent magnet producing a magnetic field in the same direction as the main winding so that said armature, after being moved by energizing said main winding to said closed position, will be direcTly attracted by said permanent magnet and stay in said close position after said main winding is deenergized until said auxiliary winding is energized.
Claim 2
Dependent Claim
196 words
A magnetic-latching relay which is maintained stable in closed as well as in open position and comprising a core having an end face and being formed from magnetizable material; an armature located adjacent said end face movable between an open position spaced from said one end face and a closed position engaging the same; a main winding about said core for generating, when energized, a magnetic field which moves said armature to said closed position; an auxiliary winding about said core for generating, when energized, a magnetic field opposite to the field generated by said main winding, said core having at said one end face an end portion projecting beyond said windings; and a ring-shaped permanent magnet surrounding said end face of said core radially spaced therefrom to define an annular gap between said core and said permanent magnet, said permanent magnet producing a magnetic field in the same direction as the main winding so that said armature, after being moved by energizing said main winding to said closed position, will be direcTly attracted by said permanent magnet and stay in said close position after said main winding is deenergized until said auxiliary winding is energized.
Claim 3
Dependent Claim
19 words
A relay as defined in claim 1, and including a ring of nonmagnetic material substantially filling said annular gap.
Claim 4
Dependent Claim
69 words
A relay as defined in claim 1, and including biassing means for biassing said armature to said open position, and wherein said core is formed of a material apt to keep a notable residual magnetism which, however, alone is not sufficient to keep said armature in said closed position against the force of said biasing means, but will do so in combination with the force of said permanent magnet.
Claim 5
Dependent Claim
90 words
A relay as defined in claim 3, and including an L-shaped member of magnetizable material having a short arm in magnetic contact with the other end face of said core, said armature being in the form of a two-arm lever having one arm facing said one end face and being pivotally mounted intermediate its ends on the end of the other arm of said L-shaped member, said biasing means comprising a leaf-spring carrying a movable contact of said relay, said leaf-spring cooperating with the other arm of said two-arm lever.
Claim 6
Dependent Claim
17 words
A relay as defined in claim 1, wherein said permanent magnet is made from plastic bonded ferrites.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |