Title: Apparatus for producing blown hollow glass objects

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Abstract: A blown hollow glass object having an optical inner wall structure is produced by pressing a plunger against a heated glass blank which has been inserted into a hollow mold cavity. The plunger is configured to taper toward a narrower end in the direction in which the plunger is introduced into the mold cavity. After formation of the optical inner wall structure by pressing of the plunger against the glass blank, the plunger is longitudinally withdrawn. The optical inner wall of the glass object is formed as a result of a generally helically shaped molding pattern defined about the exterior surface of the plunger. The molding pattern is configured in such a way as to prevent deformation of the optical inner wall structure when the plunger is withdrawn. More specifically, the helically shaped molding pattern on the exterior of the plunger is formed to comprise a main pattern surface and a secondary pattern surface extending at a predetermined angle relative to each other or relative to the diameter of the plunger so that withdrawal of the plunger may be appropriately effected.


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