Method and apparatus for prestressing fastener holes
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United States of America Patent
Stats
-
Sep 18, 1984
Grant Date -
N/A
app pub date -
Feb 10, 1982
filing date -
Feb 10, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pull gun (10) is used for pulling a mandrel (12, 150, 180) through an expandable sleeve (74, 144, 180) positioned in a fastener hole. The mandrel expands the sleeve as it moves therethrough causing the sleeve to put the metal which surrounds the hole in a state of compression. The pull gun has alternative extensions or sleeve retainers having general appearances of collet chucks and they are adapted to be positioned adjacent holes being prestressed. The retainers are of relatively small diameter for operation through a drill fixture and in small spaces on a workpiece.
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