Patent ID: 7690221

Claim:
An improved apparatus for forming sheet glass, wherein the apparatus includes an inflow pipe for delivering molten glass, a trough for receiving molten glass that has sides attached to a wedged shaped sheet forming block that has downwardly sloping sides converging at the bottom of the wedge such that a glass sheet is formed when molten glass flows over the sides of the trough, down the downwardly sloping sides of the wedged shaped sheet forming block and meets at the bottom of the wedge, wherein the improvement comprises: a) a first inflow end compression block inserted into a first cavity at an inflow end of the forming block; and b) a second far end compression block inserted into a second cavity at a far end of the forming block; such that a longitudinal compressive force is applied to a bottom of the first cavity and a bottom of the second cavity to counteract a thermal creep effect of a gravitational force from a weight of the forming block.