Apparatus including a shape memory actuating element made from t

Details Apparatus including a shape memory actuating element made from t Apparatus including a shape memory actuating element made from t

1992-04-06

1993-07-13

Yee, Deborah

Metal treatment

Stock

Mechanical memory

148908, C22F 100

Patent

active

052269795

ABSTRACT:
The present invention relates to hollow elements prepared from alloys having shape memory characteristics and techniques for heating the elements to effect the martensite (or R-phase) to austenite transformation. In its most preferred embodiment, the invention relates to the use of shape memory alloys to prepare hollow springs or tubular beams, bending and torsional, and the preferred methods of heating the elements include passing an insulated resistance heating wire through the core thereof and applying a current, or applying two layers of coating to the inside or outside of the tube, one of which is insulating and the other of which is electrically conductive. In the latter example, application of current to the conductive coating will heat the element. It is also envisioned that hot fluid may be passed through the element as the heating technique.

REFERENCES:
patent: 4412872 (1983-11-01), Albrecht et al.
patent: 4518444 (1985-05-01), Albrecht et al.
patent: 4565589 (1986-06-01), Harrison
patent: 4881981 (1989-11-01), Thoma et al.
patent: 4884557 (1989-12-01), Takehana et al.

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