Extendible-contractible, flexible, helical conduit and coupling

Details Extendible-contractible, flexible, helical conduit and coupling Extendible-contractible, flexible, helical conduit and coupling

1991-03-15

1992-07-28

Reese, Randolph A.

Pipe joints or couplings

Flexible joint, rigid members

Bellows

285280, 285302, 285424, 285903, F16L 1100, F16L 2700

Patent

active

051335794

ABSTRACT:
A flexible duct assembly having a thin peripheral wall formed with helical, i.e., sprial, ribs and adjacent grooves or valleys, the apex of each rib and valley advancing helically with axial extension of the duct, and a rotary joint on at least one end of the duct to relieve the torque otherwise resulting from the helical advancement.

REFERENCES:
patent: 2095702 (1937-10-01), Johnson
patent: 3435852 (1969-04-01), Trihey
patent: 3621884 (1971-11-01), Trihey
patent: 3727949 (1973-04-01), Kleykamp et al.
patent: 4152014 (1979-05-01), Soeffker
patent: 4345805 (1982-08-01), Finley et al.
patent: 4486260 (1984-12-01), Schaefer
patent: 4598692 (1986-07-01), Hitch
patent: 4625998 (1986-12-01), Draudt et al.

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