Shape memory alloy actuator

Details Shape memory alloy actuator Shape memory alloy actuator

2006-04-04

2006-04-04

Nguyen, Hoang (Department: 3748)

Power plants

Motor operated by expansion and/or contraction of a unit of...

Mass is a solid

C060S528000

Reexamination Certificate

active

07021055

ABSTRACT:
Actuators that employs a shape memory alloy component as the driving element include linear and rotational devices. An Intrinsic Return Means (IRM) may be imparted to the SMA actuator, thereby reducing the use of a spring return mechanism. The rotational actuator may include a cylindrical bobbin with a helical groove to receive an SMA wire. A number of turns may be placed in a small length of bobbin to amplify the rotational excursion. In another rotational actuator, a plurality of narrow, coaxial rings are provided, the rings being nested in close concentric fit or stacked in side-by-side fashion. Each ring is provided with a groove extending thereabout to receive an SMA wire and contraction of the wire causes each ring to rotate with respect to the adjacent ring. In an embodiment for linear actuation, the invention provides a bar-like component having SMA wires joined between bars. The invention includes a lost motion coupling to join two counter-acting SMA stroke amplification devices, whether linear or rotational.

REFERENCES:
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patent: 5994816 (1999-11-01), Dhuler et al.
patent: 6326707 (2001-12-01), Gummin et al.
patent: 6574958 (2003-06-01), MacGregor
patent: 6762515 (2004-07-01), Gummin et al.
patent: 6832477 (2004-12-01), Gummin et al.

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