Joints and connections – Branched – Three or more radiating members
Patent
1993-06-28
1995-03-21
Look, Edward K.
Joints and connections
Branched
Three or more radiating members
403176, 526552, 446126, E04H 1200
Patent
active
053990439
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.
REFERENCES:
patent: 3789562 (1974-02-01), De Chicchis et al.
patent: 3890022 (1975-06-01), Moon
patent: 4313687 (1982-02-01), Martinez Apeztgui et al.
patent: 4915533 (1990-04-01), de la Haye
Larson James A.
Look Edward K.
MERO-Raumstruktur GmbH & Co.
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