Patent US4371798A successfully refreshed from Google Patents.
US4371798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic cylinder
Assignee: Individual
•
Filing: 1980-03-18
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Granted: 1983-02-01
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Expires: 2000-03-18
Abstract
Abstract A magnetic cylinder has at least one magnet unit on the movable side and at least one magnet unit on the stationary side. Each unit on any such side consists of a plurality of magnets as are set to result in the positive and negative magnetic poles to alternate equiangularly in the peripheral direction of the cylinder. A piston rod and a maneuvering mechanism are operatively connected to the at least one magnet unit on the movable side in such a manner that the at least one magnet unit on the movable side may be rotationally rocked by means of the maneuvering mechanism so that by the thusly shifted attracting or repelling action between both the said magnet units the piston rod is caused to reciprocatingly move to and for in the axial direction of the cylinder.
Inventors
- 👤 Takeshi Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K7/00; H02K7/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A piston assembly comprising: a slidably mounted piston rod; a first magnetic unit mounted to said piston rod so as to be axially movable therewith, said magnetic unit including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod; means for rotationally moving said first magnetic unit with respect to the axis of said piston rod; and a second fixedly mounted magnetic unit, said second magnetic unit opposing said first magnetic unit and including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod, said first and second magnetic units disposed such that they will attract or repel each other, thereby causing linear movement of said piston rod, when said first magnetic unit is rotated into a selected position.
Claim 2
Dependent Claim
137 words
A piston assembly comprising: a slidably mounted piston rod; a first magnetic unit mounted to said piston rod so as to be axially movable therewith, said magnetic unit including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod; means for rotationally moving said first magnetic unit with respect to the axis of said piston rod; and a second fixedly mounted magnetic unit, said second magnetic unit opposing said first magnetic unit and including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod, said first and second magnetic units disposed such that they will attract or repel each other, thereby causing linear movement of said piston rod, when said first magnetic unit is rotated into a selected position.
Claim 3
Dependent Claim
65 words
A piston assembly as defined in claim 1 including a third fixedly mounted magnetic unit, said first, second, and third mounted units being mounted along the same axis, said first magnetic unit being positioned between said second and third magnetic units, said third magnetic unit including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod.
Claim 4
Dependent Claim
85 words
A magnetic cylinder as defined in claim 2 further including a tubular body bridging said second and third magnetic units and in sealing gas-tight contact therewith; first and second ports communicating with the interior of said tubular body on opposite sides, respectively, of said first magnetic unit; pipe means interconnecting said ports; and a flow regulation valve positioned within said pipe means, said flow regulation valve capable of controlling the speed of said piston rod by adjusting the fluid flow rate through said pipe means.
Claim 5
Dependent Claim
86 words
A magnetic cylinder as defined in claims 1, 2 or 3 wherein said means for rotationally moving said first magnetic unit comprises a shaft positioned within an axial center bore defined in said piston rod, said shaft being slidable and rotationally movable therein; a peripheral groove defined in said piston rod; and a pin passing through said peripheral groove, one end of said pin engaging said first magnetic unit, the other end of said pin fitted within an axially extending key groove defined in said shaft.
Claim 6
Dependent Claim
19 words
A magnetic cylinder as defined in claim 3 wherein said tubular body is filled with a substantially incompressible fluid.
Claim 7
Dependent Claim
18 words
A magnetic cylinder as defined in claim 3 wherein said tubular body is filled with a compressible fluid.
Claim 8
Dependent Claim
72 words
A magnetic cylinder as defined in claim 1 wherein said first magnetic unit includes a pair of doughnut-shaped magnets separated by a disc, each of said magnets including a plurality of magnet segments of alternating polarity in the direction of rotation about the axis of said piston rod, the magnet segments of one of said pair of magnets opposing magnet segments of opposite polarity of the other of said pair of magnets.
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |