发明名称 FLEXIBLE CORROSION-RESISTANT CONDUIT AND METHOD
摘要 <p>FLEXIBLE CORROSION-RESISTANT CONDUIT AND METHOD A flexible non-metallic, corrosion-resistant conduit for a cable assembly which includes an extruded tubular synthetic plastic liner portion having on is outer surface a plurality of circumferentially spaced helical strengthening ribs, and an extruded tubular synthetic plastic sleeve portion extending concentrically about the liner portion. According to the method of the present invention, as the liner portion is extruded via a first die, it is longitudinally pulled and rotatably twisted about its longitudinal axis to impart the desired helical configuration to the ribs. In one embodiment, the sleeve portion is extruded by a second die concentrically about the liner, thereby to fill the spaces between the ribs, and in a second embodiment, the sleeve portion is simultaneously formed by the first die integrally with the tips of the ribs, thereby to define helical passages between the ribs. According to a third embodiment, an intermediate synthetic plastic layer is extruded on the liner prior to the formation of the sleeve, and in a fourth embodiment, at least one reinforcing filament layer is wound on the liner prior to the formation of the intermediate layer.</p>
申请公布号 CA2032535(A1) 申请公布日期 1991.07.06
申请号 CA19902032535 申请日期 1990.12.18
申请人 ORSCHELN CO. 发明人 HEIMANN, ROBERT L.;SOUCIE, WAYNE L.;WEBB, DAVID R.
分类号 B29C47/02;B29C47/06;B29C63/18;B29C65/64;B29K105/08;F16C1/26;(IPC1-7):F16C1/26 主分类号 B29C47/02
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