Device for tightening coarse thread connections

A device for applying tension to a threaded stud piece, the stud piece being used to interconnect two connectable pieces and having a threaded end portion protruding from one of the connectable pieces, said device comprising:

• a pressure element having an open end, an axially-extending hollow portion extending inwardly from the open end, and a wedge receiving groove formed in an end portion of said pressure element opposite said open end and extending transversely to the axis of the hollow portion, the open end of the pressure element being positionable adjacent a surface of one of the connectable pieces so that the threaded end portion of the stud piece is received in the hollow portion of said pressure element;
• a tension element having a connecting piece extending into the hollow portion engageable with the threaded end portion of the stud piece, and a wedge groove alignable with the wedge receiving groove of said pressure element;
• a power wedge positionable in said wedge groove and said wedge receiving groove so that movement of said power wedge in a given direction urges said tension element away from the threaded end portion of the stud piece thereby applying tension to said threaded stud;
• and
• means carried by said pressure element for moving said power wedge in said given direction.

A device for tightening coarse thread connections formed in openings of two connectable pieces comprising:

• a threaded part positionable in openings of two connectable pieces and having a free end projecting from one of the connectable pieces;
• a nut screwed onto the free end of said threaded part so that a portion of the free end protrudes from the nut;
• a pressure element having a hollow body and resting on the one of the connectable pieces and receiving said free end of said threaded part;
• a tension element with a wedge groove located in the hollow body of said pressure element and fastened to the portion of the free end of the threaded part protruding from the nut;
• a power wedge with a screw drive positioned in the wedge groove of said tension element for acting upon said pressure element to produce tensioning of the threaded part, a shank portion of said tension element being positioned in the hollow body of the pressure element;
• a connecting piece mounted for rotation about its axis on said shrank portion, drillings being provided on an outer surface of said connecting piece, and an axial threaded bore formed in said connecting piece and adapted for screwing said connecting piece onto the portion of said end of the threaded part protruding from the nut;
• apertures provided in said pressure element opposite the portion of said connecting piece located at the end of the threaded part;
• and
• through bores provided in said pressure element in alignment with said wedge groove so that walls of said pressure element forming said through bores define a guide for a working surface of the power wedge.