| 摘要 |
A reinforced hose is disclosed having an overlapping spiral tube of reinforcing fabric embedded between inner and outer layers of extruded material in which the fabric is fully extended and tensioned during the manufacturing process and a good bond is obtained between the layers through the openings in the fabric. Also disclosed is a dual feed extrusion head for manufacturing such hose in which an outer nozzle assembly includes two annular plates bolted together and separable for easy cleaning. Such outer nozzle assembly is adjustably mounted on the forward end of the extruder head frame. A tubular inner nozzle assembly is provided with a nozzle at the exit end thereof located within the outer nozzle assembly and spaced therefrom. A fabric guide is positioned around the inner nozzle assembly and establishes the spiral configuration of the reinforcing fabric which in turn feeds in between the inner and outer nozzles. The inner nozzle is axially adjustable with respect to the outer nozzle. The extrusion head is constructed so that substantial access in clearance is provided around the inner nozzle assembly to provide an open feed path for the fabric as it approaches the fabric guide. A central pin which is axially adjustable within the inner nozzle assembly constitutes part of the nozzle and also provides means to expand the inner layer to extend the fabric and insure good bonding contact between the two layers of the hose.
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