Hollow bars and method of manufacture
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United States of America Patent
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-
Sep 8, 1998
Grant Date -
N/A
app pub date -
Dec 21, 1994
filing date -
Sep 25, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hollow bar (3) and a method of manufacturing the hollow bar are disclosed. Typically, the hollow bar is a threaded rock bolt or a drill rod. The hollow bar (3) comprises two or more elongate members (21a, 21b) connected together along the longitudinal edges (41) of the members (21a, 21b). The method comprises rolling the members (21a, 21b) and welding or gluing the members (21a, 21b) together along the longitudinal edges (41) of the members (21a, 21b).
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