US5317223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device in magnetostrictive motion systems
Assignee: Dynamotive Corp
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Filing: 1990-12-10
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Granted: 1994-05-31
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Expires: 2010-12-10
Abstract
Abstract Method and device for making a first body (8), having a magnetostrictive properties, and a second body (6), against which said first body is in bearing contact with a certain grip between the contact surfaces, to move with respect to each other while substantially maintaining said grip. According to the invention a magnetic field is made to sequentially influence only one of adjacent partial sections of said magnetostrictive body (8), starting from the front end of the body as seen in the intended direction of movement. The magnetic field is adjusted so that the respective partial section under the influence of the magnetic field undergoes an increase in length, at the same time being subject to a contraction in the transverse direction which is big enough in order to decrease, preferably eliminate the grip between the bodies. The device includes a rod (8) of magnetostrictive material, which is clamped within a tubular body (6), one end of which being attached to a rigid supporting structure. The magnetostrictive rod (8) is connected to a bar, a link etc. having its opposite end connected to the element to be actuated by the movement of the rod in the tubular body (6).
Inventors
- 👤 Lothar E. Kiesewetter
- 👤 Fredy Olsson
- 👤 Carl H. Tyren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:17
CPC Classifications
H; H10; H10N; H10N35/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
Method of making a first body (1, 8) having magnetostrictive properties and a second body (2, 6), against which said first body is in bearing contact with a certain grip between the contact surfaces, to move with respect to each other while substantially maintaining said grip, characterized in that a magnetic field is made to influence sequentially only one of adjacent partial sections (1a-1e) of said first body (1, 8), starting with the front end of the body as seen in the intended direction of movement, said magnetic field being adjusted so that under the influence of the magnetic field the respective partial section undergoes an increase in length and simultaneously a contraction in the transverse direction, the magnitude of which being great enough in order to decrease, preferably eliminate the grip between said bodies.
Claim 2
Dependent Claim
135 words
Method of making a first body (1, 8) having magnetostrictive properties and a second body (2, 6), against which said first body is in bearing contact with a certain grip between the contact surfaces, to move with respect to each other while substantially maintaining said grip, characterized in that a magnetic field is made to influence sequentially only one of adjacent partial sections (1a-1e) of said first body (1, 8), starting with the front end of the body as seen in the intended direction of movement, said magnetic field being adjusted so that under the influence of the magnetic field the respective partial section undergoes an increase in length and simultaneously a contraction in the transverse direction, the magnitude of which being great enough in order to decrease, preferably eliminate the grip between said bodies.
Claim 3
Dependent Claim
53 words
Method as claimed in claim 1, characterized in that said first body (1, 8) is shaped as a rod and said secondary body as a hollow body (2, 6), said rod being clamped within the hollow body between the walls thereof with a predetermined clamping grip in the transverse direction of the rod.
Claim 4
Dependent Claim
52 words
Method as claimed in claim 1, characterized in that said first body (1, 8) is shaped as a hollow body and said secondary body (2, 6) as a rod, said hollow body encircling the rod and being clamped against the rod in the transverse direction thereof and with a predetermined clamping grip.
Claim 5
Dependent Claim
37 words
Method as claimed in claim 1, characterized in that said first body (1, 8) of a material having magnetostrictive properties is mechanically pre-stressed, said pre-stressing being directed opposite the increase in length caused by the magnetic field.
Claim 6
Dependent Claim
142 words
Device for carrying out the method according to claim 1, characterized by a first body (1, 8) of a material having magnetostrictive properties, and a second body (2, 6), preferably from non-magnetic material, said both bodies being arranged in bearing contact with each other with a certain grip between the contact surfaces, means (3, 9) for generating a magnetic field and for causing the magnetic field to sequentially influence only one partial section of said first body (1, 8), starting from the front end of the body as seen in the intended direction of movement, and for adjusting the magnetic field so that the respective partial section under the influence of the magnetic field undergoes an increase in length and simultaneously a contraction in the transverse direction of a magnitude sufficient in order to decrease, preferably eliminate the grip between said bodies.
Claim 7
Dependent Claim
60 words
Device as claimed in claim 5, characterized in that said means for generating a magnetic field includes a number of magnet coils (3, 9) disposed adjacent each other, said magnet coils surrounding said first and said second bodies which are arranged in contact with each other, each magnet coil (3, 9) being separately connectable to an electric source of current.
Claim 8
Dependent Claim
44 words
Device as claimed in claim 5, characterized in that said first body (1, 8) consists of a rod of magnetostrictive material, which is clamped within a tubular body (2, 6) with a certain clamping grip between the rod the inside of the tube walls.
Claim 9
Dependent Claim
62 words
Device as claimed in claim 7, characterized in that said tubular body (6) is attached to a rigid supporting structure, said magnetostrictive rod which is clamped within the tubular body being connected to a rod, a link etc., the opposite end of which being connected with the element to be actuated when the rod is made to move within the tubular body.
Claim 10
Dependent Claim
59 words
Device as claimed in claim 5, characterized in that said first body (1, 8) consists of a hollow body and said second body (2, 6) of a rod, said hollow body of magnetostrictive material surrounding said rod and being clamped against the latter with a certain clamping grip between the contact surfaces between the hollow body and the rod.
Claim 11
Dependent Claim
55 words
Device as claimed in claim 5, characterized in that said first body (1, 8) having magnetostrictive properties includes at least one plane surface by means of which the body is in bearing contact against a supporting surface and is pressed against the supporting surface so that a certain grip is obtained between the contact surfaces.
Claim 12
Dependent Claim
38 words
Device as claimed in claim 10, characterized in that said first body (1, 8) includes two plane parallel surfaces and is clamped between two plane parallel plates so that a certain grip is obtained between the contact surfaces.
Claim 13
Dependent Claim
48 words
Device as claimed in claim 1, characterized in that said first body (1, 8) having magnetostrictive properties is pre-stressed with a compressive stress acting in a direction opposite the direction of the increase in length to which the body is subject under the influence of said magnetic field.
Claim 14
Dependent Claim
66 words
Device as claimed in claim 1, characterized in that said first body (1, 8) includes a plurality of partial sections (8a) and partial pieces (11) disposed on opposite sides of each partial section, a pre-stressing bar (10), e.g. a pre-stressing wire, extending axially through all partial pieces (11) and partial sections (8a) and being attached in pre-stressed condition to each one of said partial pieces (11).
Claim 15
Dependent Claim
57 words
Device as claimed in claim 1, characterized in that said first body (1, 8) includes a number of sheets of magnetostrictive material extending in the longitudinal direction of the body, said sheets being attached to each other by means of gluing via intermediate fibre layers under simultaneous pre-stressing by compressing the sheets in the longitudinal direction thereof.
Claim 16
Dependent Claim
55 words
Device as claimed in claim 1, characterized in that said first body (1, 8) includes a number of sheets of magnetostrictive material extending in the longitudinal direction of the body, said sheets being laminated and glued together with intermediate fibre layers, said fibres being subject to a tractional force before and during the gluing operation.
Claim 17
Dependent Claim
62 words
Device as claimed in claim 1, characterized in that said first body (1, 8) having magnetostrictive properties completely or partially is made of a giant magnetostrictive material, i.e. of an alloy between rare earth metals, such as samarium (Sm), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), tulium (Tm) and magnetic transition metals such as iron (Fe), cobalt (Co) and nickel (Ni).
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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) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |