Joint connection-system for planar or three-dimensional trusses

Abstract

In order to lower the number of individual components in joint connection-systems of planar or three-dimensional trusses of members and joints and further to reduce the frictional surfaces when implementing a member connection and to make possible a controlled prestressing force, the pipe members 10 comprise member-endpieces 14 with a borehole 16 passing a tap bolt 12 followed inward by a threaded borehole 17 into which is rotated a prestressing muff 18 with an outer thread. When the tap bolt 12 is screwed into a threaded borehole 13 of a joint-adapter 11, the inside end face of the member-endpieces 14 forms a stop for the head 26 of the tap bolt 12. A non-circular segment 23 with flats 25 to seat a corresponding rotating tool is provided to rotate the tap bolt 12 into a threaded borehole 13 of a joint-adapter 11. The prestressing muff 18 passing the tap bolt 12 through its axial borehole 21 is rotated out of the particular member-endpiece 14 and is moved to rest against the joint-adapter 11 to prestress the tap bolts 12. Further rotation in the same direction implements the prestressing of the bolt shank.

Dependencies are inferred from the claim text.