Apparatus for producing the insulating layer of a coaxial cable
AssigneeSumitomo Electric Industries, Ltd.
InventorYasunori Saito
Life of this patent
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Abstract
A spiral insulation rib between the inner and outer conductors of a coaxial cable is provided having a rectangular cross section by pointing the extrusion slit approximately in the direction of the spiral winding and by providing side surfaces of the extrusion slit which are concave so that the width of the slit is smallest at the center thereof and gradually increased toward either end.
Claims6
In an apparatus for forming a spiral rib of an insulating material between the inner and outer conductors of a coaxial cable, said apparatus including a cross head and a rotation nozzle disposed in the cross head and rotated at a predetermined rotational speed about the axis of said inner conductor and having an extrusion slit in an extrusion surface thereof for extruding a spiral rib of molten plastic insulating material onto the inner conductor as the latter runs through said nozzle at a predetermined longitudinal speed, the improvement comprising:
- said extrusion surface of said rotation nozzle being inclined with respect to a center axis of the inner conductor so that the extruded spiral rib is carried away from said slit by said inner conductor in in a direction substantially perpendicular to said extruding surface.
Dependencies are inferred from the claim text.