Hollow flexible tubular body, process and apparatus for making the same

US4019539A · kind A · utility

Assignees

• Societe Anonyme des Hauts Fourneaux de la Chiers · FR
• Coflexip · FR
• Institut Francais du Petrole des Carburants et Lubricants et Enterprise de Recherches et d'Activities Petroliers Elf · FR

Inventors

• Daniel Hoffmann · Bonn, DE
• Remi Reynard · Montesson, FR

Key dates

• Filing date: Jun 9, 1975
• Grant date: Apr 26, 1977
• Expiry date: Jun 9, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L58/16
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hollow flexible tubular body which comprises at least one tubular layer. The layer is formed by adjacent helical windings having hooked edges and substantially flat sections. The turns of the helix do not show any spontaneous tendency to increase in diameter.