Patent ID: 7866186
Filing Date: 2011-01-11
Classification: C03B

Abstract:
1. A device for producing a gas cushion for supporting a preheated glass sheet, comprising a chamber connected to a source of compressed gas, the chamber including an upper wall having an external surface dimensioned to the outline of the glass sheet and having a plurality of apertures for the passage of gas, wherein the apertures are designed as nozzles, each having an entry bore as well as a progressively widening exit hole and each being in fluid communication with the source of compressed gas so that the compressed gas passes first through the entry bore and then through the exit hole to produce the gas cushion which supports the preheated glass sheet above the external surface of the upper wall of the chamber, and that the external surface of the upper wall of the chamber has a greater degree of perforation (sum of exit areas of the exit holes in relation to total area) in edge zones of the external surface of the upper wall than in a central zone of the external surface of the upper wall which is completely surrounded by the edge zones.