Patent ID: 6564853
Filing Date: 2003-05-20
Classification: B22D

Abstract:
The method of pressure casting a plurality of battery terminals parts while inhibiting the formation of cracks and tears comprising the steps of:evacuating a plurality of battery terminal cavities to remove air therefrom; directing a first charge of molten lead into a first runner; injecting a second charge of molten lead under pressure into a plurality of runners each of which extend into a battery terminal cavity while an inlet to each of the battery terminal cavities is closed off; simultaneously opening the inlet to each of the battery terminal cavities to allow the second charge of molten lead to flow therein; and simultaneously extending a retractable piston into the second charge of molten lead in each of the battery terminal cavities to reduce volume of the second charge of molten lead before the second charge of molten lead solidifies thereby inhibiting the formation of cracks and tears in the battery terminal formed therein.