Sealing joints for automobile body and an extrusion head for extruding such joints

Abstract

Tubular sealing joint mounted along the edge of a closure element of an automobile body. It comprises a tubular member made of flexible extruded material and having a longitudinal sealing face coming in contact with another closure element of the automobile body, in closed condition of the closure elements. It is provided with spaced groups of parallel flexible sealing lips extending along the tubular member and contiguously disposed transversely of the tubular member, the flexible sealing lips being intended to compensate localized flattening of the tubular member and being integral with it. Also disclosed is an extrusion head for extruding the sealing joint, comprising a die having a central core and an outer bored body spacedly surrounding the core to define therebetween a passage for the extrusion of an elongated tubular member. The outer body is formed along a portion of its bore with contiguous lip-forming grooves opening into the extrusion passage. A diaphragm plate is in contact with the outer body and has an inner surface corresponding in shape with the bore portion of the outer body and is formed with like contiguous grooves defining lips therebetween. The diaphragm plate is rocked from a position wherein the lips of the diaphragm plate lie over the grooves of the outer body to obturate them and a position wherein the lips lie away from them to liberate them for the extrusion of flexible lips over a predetermined length of the tubular member.

Dependencies are inferred from the claim text.