Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1979-07-09
1981-04-21
Bryant, III, James E.
Pipes and tubular conduits
Flexible
Spirally wound material
138125, 138126, 138127, 138137, 156149, 156187, F16L 1108
Patent
active
042627044
ABSTRACT:
Hydraulic circuits having flexible hydraulic hoses forming part of the circuits are currently being operated at pressures in excess of 3,000 psi, and such circuits are often limited in their operating pressure by the burst strength of the hydraulic hose. By constructing a hollow core structure that forms the conduit and which serves as the foundation upon which the reinforcing is applied, with a two-layer tape composed of a layer of fabric and a layer of elastomer, which tape is then wound on a mandrel in a helically overlapping relationship with the fabric on the outside, an improved hose can be obtained after the reinforcing is applied. An increase in burst strength can be obtained in such a hose where wire cable is employed as the reinforcing in place of monofilament wire reinforcing, when the cable is formed (twisted) as it is applied, to achieve a more uniform tension on each of the strands forming the cable encircling the core structure.
REFERENCES:
patent: 3212528 (1965-10-01), Haas
patent: 3357456 (1967-12-01), Grawley et al.
patent: 3603719 (1971-09-01), Lejeune
patent: 3604461 (1971-09-01), Mathews
patent: 3729028 (1973-04-01), Horvath et al.
patent: 3791898 (1974-02-01), Remi
Bryant III James E.
Caterpillar Tractor Co.
Grant John W.
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