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US 5,803,671 AGranted
Hollow bars and method of manufacture
OwnerPeter Andrew Grayinventor
Life of this patent
Estimating the term…
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).
Claims10
A method of manufacturing a rock bolt or a drill rod having an axially extending bore, the method comprising the steps of:
- (a) forming by a method selected from the group consisting of rolling and die drawing two or more elongate members, each of which forms a lengthwise extending segment of the rock bolt or the drill rod and comprises an internal wall and an external wall;
- and
- (b) connecting the members together along the longitudinal edges thereof by gluing or welding to form the rock bolt or the drill rod with the internal walls of the members defining the axially extending bore.
Dependencies are inferred from the claim text.