C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/47
C03B 25/04 (2006.01) C03B 27/044 (2006.01) C03B 29/08 (2006.01) C03B 35/16 (2006.01)
Patent
CA 1069701
ABSTRACT OF THE DISCLOSURE The glass tempering system disclosed includes a furnace having an elongated heating chamber in which a horizon- tal roller conveyor oscillates a sheet glass load between oppo- site ends of the chamber in an end-for-end manner. The glass oscillation shortens the furnace length necessary to heat the glass to its quench temperature while still maintaining a suffi- cient speed to prevent sagging between the conveyor rollers. Preferably, the length of the oscillating movement is longer than the length of the glass load so that no one roller is continuously supporting the glass. A load station at one end of the furnace includes a horizontal roller conveyor driven by the same electric motor drive mechanism as the furnace conveyor during an index cycle so that the furnace receives a sheet glass load to be heated while simultaneously indexing a heated load outwardly through its other end to a horizontal roller conveyor of a quench unit. A second electric motor drive mechanism drives the quench unit conveyor in an oscillating manner so that the glass is tempered in a uniform manner by a quenching air flow. The two electric motor drive mechanisms are electrically coupled during the index cycle so that a tempered sheet glass load is conveyed from the quench unit to a horizontal roller conveyor of an unload station as a heated sheet glass load is conveyed to the quench unit, The conveyor of the unload station is driven by the quench unit drive mechanism during the index cycle to receive the tempered sheet glass load. Each of the conveyors includes a pair of continuous drive chains constantly driven by their associated drive mechanisms and supporting their associated conveyor rollers during the index cycle so as to frictionally drive the rollers. After the index cycle, the rollers of the load and unload station conveyors are lifted off their respective drive chains by hydraulically actuated cam arrangements so as to remain stationary during the glass oscilla- tion and enable operators to unload the glass that has been tempered and also load glass to be tempered,
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