1975-09-22
1977-02-01
Frazier, Roy D.
29271, F16B 100
Patent
active
040056295
ABSTRACT:
Fastener elements are provided for use at selected positions or openings in a composite truss system that is to be used in building construction for form work or permanent installation. The combination truss bolt drift pins proposed herein have shanks of constant cross-section for driven interfit with predrilled holes of truss elements to be joined. The shanks of the bolt pass completely through the elements being joined, and threads of lesser diameter than the shank extend outwardly from the joined elements. The fastener nuts for use with the bolts have a recess at the intended interface with the truss elements that undercut the threads thereof and that is of a size to accommodate a step shoulder of the shank thus assuring full contact of the element holes and the shank component. A drift pin extension for the bolts is of tapering contour from a larger diameter corresponding to the shank diameter to a lesser size providing easy introduction into holes intended for mating alignment. Threads in the drift pin extension are also undercut providing full engagement with fewer turns. The tip ends of the drift pin extensions are of a lesser cylindrical shape whereby the tip of one pin may be engaged in a cross hole that passes transversely through any other drift pin to provide a cooperative wrench type usage during application and removal operations. A bolt coupler having similar tapered and undercut thread features is also provided.
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Frazier Roy D.
Holko Thomas J.
Messenger C. B.
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