Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1974-10-17
1976-12-21
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
425113, 425369, 425396, B29D 2304, B29D 2318
Patent
active
039985792
ABSTRACT:
A device for producing gilled pipes of plastic or other extrudable material, the device comprising two sets of mold jaw halves arranged on an endless line, one set running in a clockwise direction and the other set running in a counterclockwise direction, said mold jaw halves being brought to run close one to the other between a fixed groove shaped guiding rail and a parallel spring-biased guiding rail to define an entrance and an outlet, a nozzle is provided at the entrance and is capable of feeding material to be extruded thereto. A mandrel is positioned between the jaws concentric with the nozzle; the mandrel has an outer end shaped at least along a part of its length substantially as a truncated cone, the diameter of which increases in the direction away from the extrusion nozzle whereby to define with the mold jaws, a channel, the outer walls of the channel being formed by the mold jaws surrounding the mandrel and extending in the longitudinal direction of the mandrel, the inner sides of the mold jaws defining the outer shape of the pipe to be made and being provided with spaced substantially annular grooves. The angle between the generatrix and the longitudinal axis of the truncated cone is acute and less than 45.degree. so that the material by force will be pressed into the grooves by the conical portion of the mandrel head while jaws are passing the mandrel head so that the grooves of the mold jaws will be substantially filled at the same time as the pipe wall with an even inner wall in a longitudinal direction is being formed around the mandrel head.
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patent: 3743456 (1973-07-01), Cini
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patent: 3819778 (1974-06-01), Maroschak
patent: 3891007 (1975-06-01), Kleykamp
Lazarus Richard B.
Rowold Carl
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