Patent ID: 9738557
Date: 2017-08-22
CPC Classifications: C03B

Claim:
1. An apparatus for manufacturing front glass for a display of an electronic device, the front glass being formed by a mold assembly comprising an upper mold and a lower mold and having at least partially a curved surface shape, the apparatus comprising: an inner tube of a specific length, the inner tube having an entrance portion for allowing the mold assembly for heat treatment to enter the inner tube and an exit portion for allowing the mold assembly after the heat treatment to exit; a conveyer belt for feeding a plurality of mold assemblies thereon, at specific speed, to pass through the inner tube; a chamber surrounding the inner tube between the entrance portion and exit portion of the inner tube, and having a heat source for forming a temperature atmosphere for plastic deformation of the front glass fed within the inner tube; a plurality of nitrogen supply ports installed in the entrance portion and exit portion of the inner tube, respectively, for supplying nitrogen continuously to the inner tube when the apparatus operates; an emergency nitrogen supply port installed at least on one side of the entrance portion and the exit portion close to the chamber, for supplying nitrogen to the inner tube when density of oxygen within the inner tube is higher than a reference value; a frame for supporting the inner tube and the chamber from a ground at a predetermined height; and a support bar installed in the frame, for supporting a bottom surface of the inner tube which is thermally expanded in a length direction due to heat from the chamber, the support bar installed at least on one side of the entrance portion and exit portion of the inner tube, wherein the support bar is supported through bearings with respect to the frame and comes into rolling contact with the bottom surface of the inner tube outward moved by thermal expansion.