Device for selectively tensioning and clamping studs mounted on

Details Device for selectively tensioning and clamping studs mounted on Device for selectively tensioning and clamping studs mounted on

1995-03-13

1996-11-05

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

81 5738, E21B 1900

Patent

active

055708714

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.

REFERENCES:
patent: 3039741 (1962-06-01), De Mart
patent: 3664213 (1972-05-01), Anati
patent: 3844533 (1974-10-01), Markiewicz et al.
patent: 4315446 (1982-02-01), Orban
patent: 4433828 (1984-02-01), Spiegelmann et al.
patent: 4535656 (1985-08-01), Orban
patent: 4708036 (1987-11-01), Vossbrink
patent: 5271297 (1993-12-01), Heiermann
patent: 5330159 (1994-07-01), Heiermann

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