Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1994-10-21
1996-06-18
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264322, B29C 5704
Patent
active
055275036
ABSTRACT:
A unitary molded tubular connector and method for forming the connector is described. The connector has an end cap of first internal diameter, a tubular segment of diameter equal to that of the end cap, a threaded fastening means, and a belled tubular end having a larger internal diameter and outer diameter, but of the same thickness as the tubular segment. The connector is prepared by the steps which include (1) placing an end of the tubular connector partially on a projecting mandril emanating from a male die, the male die including a cup-shaped recess from which the mandril projects axially and concentrically; (2) heating some of the tubular connector projecting from a female die sufficiently to make such projecting portion pliable enough to form; (3) forming the heated portion of the tubular connector into the end cap by the cooperating recesses of the male and female dies; (4) inserting the internally-threaded nut onto the tubular connector; and (5) repeating the initial processing steps with a second male die which includes an annulus-shaped recess which increases from a first internal diameter to a second internal diameter and correspondingly increases from a first outer diameter to a second outer diameter so as to maintain the connector wall thickness constant.
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