B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/757, 18/772
B29C 47/28 (2006.01) B29C 47/02 (2006.01) B29C 47/20 (2006.01)
Patent
CA 1036765
ABSTRACT OF THE DISCLOSURE The present invention provides a method for embedding a preformed helically wound reinforcing wire substantially inter- mediately within the sized walls of a molded thermoplastic cylinder comprising providing a source of thermoplastic material, feeding said thermoplastic material flowingly into a sized run constituted of a continuous rectilinear path of annular cross- section having inner and outer boundaries for travel of said material therealong, providing a helically wound wire of less inside and outside diameter than the respective inside and outside diameters of said sized run inside and outside boundaries, providing rotating means substantially axially concentric with said sized run but terminating spacedly therefrom for externally carrying said helical wire toward said sized run for unsupportedly delivering and feeding to the transverse central portion of said sized run that portion of the wire to be embedded within the thermoplastic material during and concurrently with the feeding of the thermoplastic material to said sized run whereby said reinforcing wire will be located in substantially equally spaced distance from the inner and outer boundaries of the molded thermoplastic cylinder. The present invention also provides a device for embedding an elongated helically shaped reinforcing element within a molded thermoplastic body of annular cross section comprising an extrusion head having a forward portion and a rearward portion, a source of thermoplastic material, said extrusion head rearward portion having a feed duct with an inlet communicating with said source of thermoplastic material, said duct extending through said extrusion head and opening through the forward portion of the inner face thereof providing a feed duct outlet. said extrusion head forward portion embodying a longitudinally extending, annular sizing run having a rearward end communicating with said feed duct outlet, means provided ternally of said extrusion head rearward por- tion, rearwardly of said sizing run and said feed duct outlet, defining an anular passage coaxial with said sizing run, but having a cross section less than that of said sizing run, said annular passage having a forward outlet end communicating with the rearward end of said sizing run substantially at the con- fluence of the latter with said feed duct outlet, means provided rearwardly of said annular passage and communicating with same at its rearward outlet carrying a supply of said reinforcing element, and means for advancing said supply carrying means whereby said reinforcing element is introduced into said passage, forced therethrough, and thence forced into said sizing run whereby in view of the coaxiality of said annular passage and said sizing run said reinforcing element is centered within said sizing run.
196229
Tamborini Ariberto
Tamborini Giancarlo
Na
Tamborini Ariberto
Tamborini Giancarlo
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