Swage coupling including disposable shape memory alloy actuator
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United States of America Patent
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-
Sep 2, 1997
Grant Date -
N/A
app pub date -
Nov 13, 1995
filing date -
Nov 13, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A threadless self-swaging coupling for joining or capping pipe. The coupling includes a coupling member and an actuating member of a heat shrinkable polymer material or a shape memory alloy material which undergoes a change in shape when heated from a martensitic state to an austenitic state. The coupling includes an inner sleeve and an outer ring surrounding the inner sleeve. The outer ring is movable with respect to the inner sleeve such that the inner surface of the inner sleeve is deformed radially inwardly and swaged to a pipe fitted therein when the outer ring is moved with respect to the inner sleeve. The outer ring is engaged with the actuating member such that the outer ring can be rotated with respect to the inner sleeve when the actuating member is heated into the austenitic state. The actuating member can be left in place or removed from the coupling.
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