Apparatus for screwing in and out studs or bolts of large dimens

Details Apparatus for screwing in and out studs or bolts of large dimens Apparatus for screwing in and out studs or bolts of large dimens

1988-05-26

1992-04-07

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5724, 81 5738, B25B 2900

Patent

active

051016940

ABSTRACT:
The apparatus for screwing in and out studs (3) of large dimensions, particularly for fastening a cover (2) of a vessel (2) provided with threaded holes, comprises a system (13) which serves to balance the weight of the stud and is force pilot operated by an oleohydraulic means by electrohydraulic feedback control based on accurate measurement of the hydraulic pressure detected at the oleohydraulic means or the balancing load to be exerted by said oleohydraulic means in order to limit the contact pressure between the stud and the threaded hole, and which axially drives, over an adequate path, a mechanism rotationally driving the stud and a means for gripping said stud.

REFERENCES:
patent: 4047456 (1977-09-01), Scholz
patent: 4295393 (1981-10-01), Adcock
patent: 4380181 (1983-04-01), Bunyan
patent: 4498545 (1985-02-01), Grassi et al.

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