Apparatus for injection-molding a liner onto a metal spool

Details Apparatus for injection-molding a liner onto a metal spool Apparatus for injection-molding a liner onto a metal spool

1982-04-14

1983-09-13

Czaja, Donald E.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Female mold type means

264269, 2643289, 26432812, 425572, 425573, B29F 110

Patent

active

044039336

ABSTRACT:
An apparatus 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 liner cavity to evenly fill this cavity as well as the boss cavities without creating weld lines therein.

REFERENCES:
patent: 2330369 (1943-09-01), Marsh
patent: 2524858 (1950-10-01), Thomas
patent: 2914800 (1959-12-01), Morin
patent: 3989436 (1976-11-01), McNeely et al.
patent: 4091057 (1978-05-01), Weber
patent: 4115505 (1978-09-01), Metabi
patent: 4284591 (1981-08-01), Neefe

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