Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1980-04-08
1987-04-14
Bryant, III, James E.
Pipes and tubular conduits
Flexible
Spirally wound material
138144, 138154, 138174, 138DIG7, F16C 1108
Patent
active
046570497
ABSTRACT:
A reinforced composite tubular body comprises a metallic reinforcement of helical convolutions completely embedded in a tubular body of thermosetting polymer which has a coefficient of elongation at rupture less than 15%. The reinforcement comprises at least one metallic reinforcing strip wound helically around the longitudinal axis of the tubular body so as to form a plurality of successive helical convolutions completely embedded in the wall thickness of the tubular body and separated from one another by the polymeric material. The extent of overlap of adjacent helical convolutions is at least equal to e.multidot..sigma..sub.r /2.tau. where e designates the thickness of the strip, .sigma..sub.r the ultimate breaking strength of the strip and .tau. the shear strength of the metallic strip/polymeric material interface. Fillers may be incorporated in the tubular polymeric material to reduce the amount needed of the more expensive polymeric material and/or to impart other desired properties to the reinforced composite tubular body.
REFERENCES:
patent: 2640501 (1953-06-01), Scott et al.
patent: 3548882 (1970-12-01), Rinker
patent: 3790438 (1974-02-01), Lewis et al.
Anderson Eric
Fourty Georges
Rexer Jurgen
Adams Bruce L.
Bruns Robert F.
Bryant III James E.
Lobato Emmanuel J.
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