US4405387A
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Process to produce a reversible two-way shape memory effect in a component made from a material showing a one-way shape memory effect
Assignee: BBC BROWN BOVERI & Co Ltd
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Filing: 1982-07-27
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Granted: 1983-09-20
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Expires: 2002-07-27
Abstract
Abstract A notable two-way effect can be induced in components made of a memory alloy exhibiting only a one-way effect by applying an external force which gives rise to an internal stress opposing the one-way effect. Component made of a memory alloy in the form of a tension, compression bending, or torsion rod (helical spring 2). External force by weight or spring (counter-spring 3).
Inventors
- 👤 Joachim Albrecht
- 👤 Thomas Duerig
- 👤 Walter Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:40
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A process for inducing a reversible two-way shape memory effect in an already existing component made of a shape memory alloy exhibiting a one-way effect comprising first solution treating said component in a temperature range of β-solid solution, subsequently quenching in water, and then deforming said component under operating conditions by subjecting to an external load said load being applied in the form of a counterweight, a spring, or an additional component rigidly joined to and hindering free movement of said shape memory component provoking an internal stress counteracting said one-way effect.
Claim 2
Dependent Claim
92 words
A process for inducing a reversible two-way shape memory effect in an already existing component made of a shape memory alloy exhibiting a one-way effect comprising first solution treating said component in a temperature range of β-solid solution, subsequently quenching in water, and then deforming said component under operating conditions by subjecting to an external load said load being applied in the form of a counterweight, a spring, or an additional component rigidly joined to and hindering free movement of said shape memory component provoking an internal stress counteracting said one-way effect.
Claim 3
Dependent Claim
20 words
The process according to claim 1, wherein the said memory alloy is a Cu-Al-Ni, Cu-Al, Cu-Zn-Al, Ti-V or Ti-Nb, alloy.
Claim 4
Dependent Claim
24 words
The process according to claim 1, wherein the component is a tension rod stressed axially by a load in the form of a counterweight.
Claim 5
Dependent Claim
32 words
The process according to claim 1, wherein the component is a bending element stressed perpendicularly to the longitudinal axis by a static load in the form of a weight or a spring.
Claim 6
Dependent Claim
29 words
The process according to claim 1, wherein the component is a helical spring stressed equiaxially, but in opposition to the one-way effect by a counter-spring impressing a variable load.
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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |