Heat-expandable multi-passage pipe having parts for intended bre

Details Heat-expandable multi-passage pipe having parts for intended bre Heat-expandable multi-passage pipe having parts for intended bre

1979-11-20

1981-09-15

Stephan, Steven L.

Pipes and tubular conduits

Plural duct

Longitudinally extending common wall

60322, 60323, 138 37, 165 81, 220 89A, 285 4, 285187, 428 43, 428167, D03D 1300, F01N 700, F28F 700, B65D 6528

Patent

active

042891698

ABSTRACT:
A heat-expandable tube-like component includes a tubular wall having a length dimension and defining an inner space; and a septum attached to the tubular wall and dividing the inner space into separate, longitudinally extending passages. The septum has a weakened portion which includes first and second groove-like recesses in opposite faces of the septum. The first recess extends substantially parallel to the length dimension (axial dimension) of the tubular wall. The second groove-like recess extends slightly offset from and parallel to the first groove-like recess. Further, portions of the septum flanked by the first and second recesses are sufficiently weak to break under the effect of forces derived from heat-caused expansion of the component. Also, the recesses are so arranged with respect to one another that upon breakage of the septum portions flanked by the recesses the septum halves obtained by the breakage are adapted to glide past one another.

REFERENCES:
patent: 3798903 (1974-03-01), Mitchell et al.
patent: 3864909 (1975-02-01), Kern
patent: 4097071 (1978-06-01), Crawford et al.
patent: 4188784 (1980-02-01), Hall

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