B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/683
B29C 45/14 (2006.01) G01F 1/58 (2006.01)
Patent
CA 1219418
ABSTRACT The invention is a technique for injection-molding an insulating liner onto the surface of a metal spool to be included in an electromagnetic flowmeter in which the fluid to be metered is conducted through the lined spool. The spool is composed of a cylindrical body having end flanges and a pair of diametrically-opposed circular bosses disposed midway between the flanges to receive the meter electrodes. To carry out injection-molding, the spool is supported within a mold which defines a liner cavity conforming to the inner surface of the cylindrical body and to the faces of the end flanges, the liner cavity communicating with cavities conforming to the inner surface of the electrode bosses. The molding material is injected into a sprue in the mold which runs along the longitudinal axis of the spool toward the hub of a runner extending radially toward an axisymmetric ring gate opening into the liner cavity at a point adjacent the boss cavities. The molding material passing through the ring gate then flows in opposite directions in the linear cavity to evenly fill this cavity as well as the boss cavities without creating weld lines therein. Among the advantages arising from use of this technique is the avoidance of weld lines that weaken the liner structure.
425782
Davis James W.
Mannherz Elmer D.
Fischer & Porter Company
Smart & Biggar
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