Duro-test Corporation

Donald G Trutner

Luke Thorington

Raymond P Fontana

David Kovacs

A hollow glass article having an improved optical finish which is formed by placing a molten material in the original article while it is constrained in a mold. The molten material softens the glass and produces a hydrostatic pressure which reforms the article into the finished shape by expanding the original glass article to the shape of the mold.

Hollow glass article with improved optical finish

A method and apparatus for reworking hollow workpieces, illustratively glass lamp bulbs, to a desired dimensional accuracy and optical finish. In the method, a workpiece is placed within a mold having a cavity which defines the desired dimensions. Molten metal, preferably tin, of temperature sufficient to soften the workpiece is introduced into the hollow interior of the workpiece. The static pressure of the molten metal forces the softened workpiece into contact with the interior surface of the mold thereby imparting to the workpiece the desired dimensions. Molten metal of lower temperature is then introduced into the workpiece from a lower interior portion thereof, displacing the molten metal of high temperature out of the workpiece. The newly introduced molten metal cools the workpiece so that it may be handled without deforming. The molten metal is then removed from the interior of the workpiece and the workpiece is removed from the mold. The method may advantageously be employed in a nonoxidizing environment, such as one of nitrogen gas. In the apparatus, first and second mold portions have interior portions which align to define a mold cavity. The mold portions are laterally separated to receive a workpiece within the mold cavity. A reservoir supplies heated fluid to the interior of the hollow workpiece. The mold portions and contained workpiece are downwardly rotated to decant fluid from the interior of the workpiece.

Method and apparatus for reworking a hollow workpiece

An incandescent electric lamp having an envelope with a portion through which a pair of lead-in studs are brought out, the filament leads being connected to the studs. The lamp is sealed off in the area where the studs are located and an adaptor is provided to make contact with the portions of the studs extending through the envelope so that the lamp can be mounted in a socket.

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Chatham, NJ, United States of America

Donald G Trutner