Metal treatment – Stock – Mechanical memory
Patent
1991-10-23
1994-09-06
Dean, Richard
Metal treatment
Stock
Mechanical memory
83 18, 83 19, 83523, 83580, 294264, 294265, 30 92, 30277, 30278, B21F 1100
Patent
active
053445066
ABSTRACT:
A shape memory alloy (SMA) actuator predeformed in compression actuates a cable cutter mechanism. A cable or other item to be cut is placed between an anvil and a movable blade affixed to the SMA element. The SMA element is heated by an electrical resistance heater to cause it to return to its undeformed elongated state, thereby moving the blade against the anvil to compress and sever the cable or other item. Ones of the shape memory alloy actuator have a plurality of parallelly arranged SMA elements, every other one of which is predeformed in compression and intermediate ones of which are predeformed in tension. The elements are coupled end-to-end so that, when they are heated to cause them to return to their undeformed states, their respective elongations and shrinkages combine at the output to produce an actuation that is the cumulation in the same direction of the changes of all the elements. The plurality of elements may be in a side-by-side or concentric arrangement.
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Berard Jr. Clement A.
Dean Richard
Ip Sikyin
Martin Marietta Corporation
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