(57) @ A temperature actuated traction device comprises an element (30) of a heat responsive
memory material, to respective ends of which are connected two relatively movable
parts (13, 16). One part (13) is connected to a load which is to be displaced relatively
to the other part (16) to cause a change in shape of the ductile element (30) when
cold. Heating means is provided to cause heating of the element (30) to restore it
to its original shape whereby a restoring force is applied to the displaced load,
and a spring (20) is provided to allow yielding of the other part (16) under traction
applied to the load when the element (30) is hot.
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