Self-erecting spiral metal tube with one textured side

Details Self-erecting spiral metal tube with one textured side Self-erecting spiral metal tube with one textured side

1990-02-27

1991-11-12

Sewell, Paul T.

Pipes and tubular conduits

Spirally seamed

138129, 138134, 138145, 138150, F16L 916

Patent

active

050639692

ABSTRACT:
A self-erecting, coiled metal tube comprises a helically wound ribbon of spring material having an inside surface and an outside surface, the ribbon having adjacent turns stressed to coil in tight overlapping and telescoping engagement, and a textured surface formed on the outside surface of the ribbon so that when the ribbon is extended, the textured surface of an underlapped turn of ribbon bears against the inner surface of an overlapped turn of ribbon to create friction between the adjacent turns of ribbon and control the length of extension of the ribbon tube and strengthen the tube.

REFERENCES:
patent: 3007239 (1961-11-01), Lermont
patent: 3448939 (1969-06-01), Bieber
patent: 3467329 (1969-09-01), Giltner
patent: 3587658 (1971-06-01), Giltner
patent: 3635156 (1972-01-01), Krebs et al.
patent: 3743267 (1973-07-01), Guerster et al.
patent: 3860041 (1975-01-01), Leiter
patent: 3863405 (1975-02-01), Leiter
patent: 3888283 (1975-06-01), Cauffiel
patent: 4869704 (1989-09-01), Fisher

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