Device for selectively tensioning and clamping studs mounted on a pressure vessel to permit nuts to be tightened or loosened
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United States of America Patent
Stats
-
Nov 5, 1996
Grant Date -
N/A
app pub date -
Mar 13, 1995
filing date -
Mar 16, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for tightening and releasing nuts on screw-threaded studs to fit or release a cover on a pressure vessel employs several devices each for subjecting a respective one of the studs to tension to clamp the stud whilst the nut is rotated thereon. Each device employs a coupling mechanism for clamping a rod-like extension piece in end-to-end relationship to one of the studs to apply tension force thereto from a hydraulic piston and cylinder unit. The coupling mechanism takes the form of a sleeve containing several arcuate coupling segments guided for displacement radially of the stud and its extension piece. Cam surfaces on the coupling segments and the sleeve inter-engage as the sleeve is rotated to effect the displacement of the coupling segments between open and closed positions.
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