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

1994-04-22

1995-09-26

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

254 29A, B25B 2902

Patent

active

054526299

ABSTRACT:
Apparatus for tightening and releasing nuts on screw-threaded studs to fit or release a cover on a pressure vessel employs several devices for subjecting each of the studs to tension to clamp the stud whilst the nut is rotated thereon. Each device has a passage for receiving one of the studs and a threaded sleeve engaged thereon. An hydraulic piston and cylinder unit subjects the sleeve to tensile force and likewise the stud coupled thereto. Also in the passage there is a sensor which has spring biased relatively movable components for engaging on a head of the stud and on a system of rods providing a reference. The sensor is suspended in the passage and provides an indication of the strain imposed on the stud by the hydraulic unit.

REFERENCES:
patent: 3844533 (1974-10-01), Markiewicz et al.
patent: 4773146 (1988-09-01), Bunyan
patent: 5271297 (1993-12-01), Heiermann et al.
patent: 5330159 (1994-07-01), Heiermann et al.

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