Flexible corrugated tube
OwnerEmil Siegwartinventor
Life of this patent
Estimating the term…
Abstract
A flexible corrugated tube comprising a succession of convolutions of spirally coiled thin metal strip having the overlapping corrugations of adjacent convolutions locked together by a plurality of spaced apart detents about the circumference of at least one of the sets of overlapping corrugations. Apparatus for forming the tube comprises a grooved roller in which at least one of the grooves comprises ridges extending a limited distance from the groove base toward the roller surface.
Claims6
A flexible corrugated tube comprising a succession of axially displaced convolutions of spirally coiled thin metal strip having longitudinally extending corrugations, the corrugations being of wave form having alternating arcuate axially spaced crests and troughs, the borders of successive tube convolutions overlapping each other with at least one corrugation in the overlying border portion of one convolution fitting into one corrugation of the underlying border portion of an adjoining convolution, characterized in that a plurality of detents are provided in the crests of said interfitting corrugations, said detents are circumferentially spaced apart and positioned about said interfitting corrugations, portions of said interfitting corrugations having said wave form extend between said detents, and each detent forms a generally S-shaped crimp on each side of said interfitting corrugations overlying the adjacent trough and locks together said interfitting corrugations and said border portions of said overlapping convolutions.
Dependencies are inferred from the claim text.