E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 21/00 (2006.01) B21K 1/70 (2006.01) E02D 5/74 (2006.01) F16B 13/00 (2006.01) F16B 13/14 (2006.01)
Patent
CA 2072852
A threaded fastener and method of fabrication thereof wherein the fastener or nut includes a first portion having external, wrench-engaging surfaces and a central, through bore, internally threaded for at least a portion of its length from a base surface. A wall portion extends integrally from the end of the first portion opposite the base surface, concentrically surrounding and spaced radially outwardly from the end of the bore. The first end wall portions are formed as a metal casting with the wall portion in two segments separated by longitudinally extending, V-shaped notches. The free edges of the wall segments, which initially lie in a plane normal to the axis of the bore, are deformed by a die, moving radially inward so that the wall segments are in a domed configuration with the free edges defining a substantially oval opening having a major axis with a length about equal to the diameter of the bore and a minor axis about 4/5 that of the major axis. A method of supporting a mine roof using such a threaded fastener with a bearing plate, resin cartridge and elongated rod having threads mating with the internal threads of the bore is also disclosed.
Clark Carl A.
Wright Raymond L.
Eastern Company (the)
Macrae & Co.
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