Handling: hand and hoist-line implements – Grapple – Load shifting
Patent
1991-10-23
1994-05-17
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Load shifting
60528, 294 8224, 294 823, B25J 1500, F03G 706
Patent
active
053121520
ABSTRACT:
A shape memory alloy (SMA) actuator predeformed in tension actuates a separation device mechanism. A segmented nut, which engages a threaded bolt to be held and released, is held together by a nut retainer that is movable with respect to the nut and is affixed to the SMA element. The SMA element is heated by an electrical resistance heater to cause it to return to its undeformed state, thereby moving the retainer relative to the nut segments. When the retainer disengages from the segments, the segments are free to move outwardly thereby releasing the bolt 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. Embodiments of the separation nut also include a plunger arrangement for urging the nut segments to move apart when released by the nut retainer and an ejector for pushing the released bolt or other item out of the separation device housing.
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Hi-Shear Corp/Ordnance Division, Product Line Data Sheets SL1016, SL1010, SL1013, SL1022, SN9400 series, SN700 series, SP series (No date).
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DeAngelis Dominick A.
Woebkenberg, Jr. William H.
Berard Jr. Clement A.
Cherry Johnny D.
Martin Marietta Corporation
Meise William H.
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