Controllable stiffness duct

Details Controllable stiffness duct Controllable stiffness duct

1981-06-25

1983-12-27

Askin, Laramie E.

Electricity: conductors and insulators

Combined fluid conduit and electrical conductor

138111, 138122, 138131, 138136, F16L 1111, F16L 1112, F16L 1116

Patent

active

044232837

ABSTRACT:
A controllable stiffness duct having a spirally wound metallic strip with a spiral turns interlock to define a flexible product carrying or delivering conduit. Disposed in the spiral turns interlock is a pressure line inflatable to stiffen the conduit and resist collapse. The pressure line may be used to convey fluid through the duct to power a device at a remote end of the duct. The pressure line may include imbedded electrically conductive materials to provide electrical power to the remote end of the duct. An insulating layer and a protective wire rope sheath cover the conduit to form the controllable stiffness duct.

REFERENCES:
patent: 805825 (1905-11-01), Sussman et al.
patent: 1651022 (1927-11-01), Fulton
patent: 3047026 (1962-07-01), Kahn
patent: 3110922 (1963-11-01), Senne
patent: 3117596 (1964-01-01), Kahn
patent: 3928715 (1975-12-01), Holden
patent: 4336798 (1982-06-01), Beran
patent: 4368088 (1983-01-01), Asakura et al.

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