US3728654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid operated plunger device
Assignee: Hosiden Electronics Co Ltd
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Filing: 1971-09-20
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Granted: 1973-04-17
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Expires: 1991-09-20
Abstract
Abstract Within a cylindrical yoke of magnetic material are disposed first and second axially spaced coils in concentric relationship therewith. A first permanent magnet is arranged inside the first coil in abutting relation with one of the end plates of the yoke, and a second permanent magnet is arranged inside the second coil in abutting relation with the other end plate. A movable magnetic body is located inside the first and second coils for movement between the first and second permanent magnets. A plunger extends from one end of the movable magnetic body through a permanent magnet and the yoke to the exterior thereof. A current pulse supplied to the first coil causes the movable body to be attracted to the first permanent magnet, and a current pulse supplied to the second coil causes the movable body to be attracted to the second permanent magnet.
Inventors
- 👤 K Tada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:12
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607; H01F7/1615; H01F7/134; H01F7/121; H01F7/122
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
283 words
Solenoid operated plunger device comprising first and second permanent magnets disposed on opposite sides of a movable magnetic body and spaced therefrom in alignment with the direction of movement thereof, a magnetic yoke disposed externally of the magnets and connecting them to each other, a first solenoid coil within the yoke and extending across the first magnet and the movable magnetic body at a position external of both, a second solenoid coil within the yoke and extending across the second magnet and the movable magnetic body at a position external of both, and a plunger mounted on at least one end of the movable magnetic body and extending through an associated one of the magnets and the yoke to the exterior thereof, said permanent magnets, movable magnetic body, coils, and magnetic yoke being so disposed relative to one another that the flux path of the first permanent magnet, the flux path of the second permanent magnet, the path of flux produced upon energization of the first coil, and the path of flux produced upon energization of the second coil all extend in common along a single magnetic path which passes in succession from one of said permanent magnets through said movable body, then through the other of said permanent magnets, and then through said magnetic yoke to said one of said permanent magnets, said movable magnetic body being moved from a position where it is held attracted to one of the permanent magnets to a position adjacent the other permanent magnet by so energizing the coil associated with said other permanent magnet as to produce a flux which cancels the flux from said one permanent magnet and which demagnetizes said one permanent magnet.
Claim 2
Dependent Claim
283 words
Solenoid operated plunger device comprising first and second permanent magnets disposed on opposite sides of a movable magnetic body and spaced therefrom in alignment with the direction of movement thereof, a magnetic yoke disposed externally of the magnets and connecting them to each other, a first solenoid coil within the yoke and extending across the first magnet and the movable magnetic body at a position external of both, a second solenoid coil within the yoke and extending across the second magnet and the movable magnetic body at a position external of both, and a plunger mounted on at least one end of the movable magnetic body and extending through an associated one of the magnets and the yoke to the exterior thereof, said permanent magnets, movable magnetic body, coils, and magnetic yoke being so disposed relative to one another that the flux path of the first permanent magnet, the flux path of the second permanent magnet, the path of flux produced upon energization of the first coil, and the path of flux produced upon energization of the second coil all extend in common along a single magnetic path which passes in succession from one of said permanent magnets through said movable body, then through the other of said permanent magnets, and then through said magnetic yoke to said one of said permanent magnets, said movable magnetic body being moved from a position where it is held attracted to one of the permanent magnets to a position adjacent the other permanent magnet by so energizing the coil associated with said other permanent magnet as to produce a flux which cancels the flux from said one permanent magnet and which demagnetizes said one permanent magnet.
Claim 3
Dependent Claim
196 words
Solenoid operated plunger device comprising a cylindrical magnetic yoke having its opposite ends closed, a first coil concentrically disposed within the yoke and along the inner periphery thereof within substantially one-half of the axial length of the yoke, a second coil concentrically disposed within the other half of the yoke and along the inner periphery thereof, a first permanent magnet located inside the first coil in contact with one of the end plates of the yoke, a second permanent magnet located inside the second coil in contact with the other end plate of the yoke, a movable magnetic body arranged for movement within the first and second coils between the first and second magnets, and a plunger mounted on one end of the movable magnetic body and extending through the first permanent magnet and one of the end plates to the exterior thereof, the space between said first and second coils being constituted entirely by non-magnetic material, whereby the energization of either of said coils produces a flux which passes through both of said permanent magnets, through said movable magnetic body and through said yoke without extending into the space between said first and second coils.
Claim 4
Dependent Claim
196 words
Solenoid operated plunger device comprising a cylindrical magnetic yoke having its opposite ends closed, a first coil concentrically disposed within the yoke and along the inner periphery thereof within substantially one-half of the axial length of the yoke, a second coil concentrically disposed within the other half of the yoke and along the inner periphery thereof, a first permanent magnet located inside the first coil in contact with one of the end plates of the yoke, a second permanent magnet located inside the second coil in contact with the other end plate of the yoke, a movable magnetic body arranged for movement within the first and second coils between the first and second magnets, and a plunger mounted on one end of the movable magnetic body and extending through the first permanent magnet and one of the end plates to the exterior thereof, the space between said first and second coils being constituted entirely by non-magnetic material, whereby the energization of either of said coils produces a flux which passes through both of said permanent magnets, through said movable magnetic body and through said yoke without extending into the space between said first and second coils.
Claim 5
Dependent Claim
87 words
Solenoid operated plunger device according to claim 2 further including means for supplying the first and second coils with a drive current separately, and wherein the direction of winding of the first and second coils and the polarity of the drive current are chosen such that the direction of magnetization of the first and second magnets caused by a current supplied to the first coil is opposite to the direction of magnetization of the first and second magnets caused by a current supplied to the second coil.
Claim 6
Dependent Claim
38 words
Solenoid operated plunger device according to claim 2, further including a second plunger mounted on the other end of the movable magnetic body and extending through the second magnet and the other end plate to the exterior thereof.
Claim 7
Dependent Claim
76 words
Solenoid operated plunger device according to claim 2, in which the magnetic yoke is in the form of a hollow cylinder and has a bobbin concentrically disposed therein, the first and second coils being wound on one-half and the other half of the bobbin, respectively, the first and second magnets being fitted into the opposite ends of the bobbin, the movable magnetic body being arranged within the bobbin for movement between the first and second magnets.
Claim 8
Dependent Claim
52 words
Solenoid operated plunger device according to claim 5, further including cylindrical spacer means of nonmagnetic material interposed between the inner periphery of the bobbin and the magnets for maintaining a given spacing between the first and second magnets, the movable magnetic body being arranged within the spacer means for axial movement therein.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |