Ppg Industries, Inc.

Jack A Bricker

Earl L May

James Gary Anderson

Gerald E Kunkle

William R Siskos

Donald P Michelotti

DeWitt W Lampman

Raymond J Mouly

John R Dahlberg

John P Durci

James J Oravitz, Jr

Selected portions of a glass sheet are heated to elevated temperatures and offset, i.e. reformed, relative to the remaining portions of the glass sheet while maintaining the optical properties of the remaining portions of the glass sheet. The reformed area can be used as a structure to which guide brackets are other hardware can be secured or as an integral glass ledge to guide the up and down movement of the glass sheet within a vehicle door frame.

Shaping glass sheets

Flame seaming a glass sheet of irregular outline using a ring-type burner having an apertured inner wall aligned with the central portion of the glass sheet edge develops an edge of more uniform appearance when the application of a fuel mixture to a portion of said apertured wall facing the glass edge is different for curved portions of the wall facing curved portions of the glass sheet outline than to straight line portions of the wall facing straight portions of the glass sheet outline. Further reduction of non-uniformity of glass edge appearance may result from providing orbital motion between said glass sheet outline and an apertured inner wall of said ring-type burner.

Method and apparatus for glass edge finishing

A glass sheet is cut while at a temperature at about its annealing point temperature by scoring the glass sheet along a line of cut and imparting a bending moment to the glass along the scored line to open the glass. The glass sheet remains at its elevated temperature throughout the cutting operation to reduce or eliminate additional heating required for subsequent processing.

Method for cutting hot glass

Glass shapes and sheets are cut directly from a heated glass ribbon while maintaining the optical quality of the cut glass. A float glass ribbon is removed from a glass forming chamber and prior to annealing, a line of cut is heated to its softening temperature. A blade arrangement thereafter penetrates the glass along the heated line of cut to sever the glass. During the line heating and cutting operation, the overall glass temperature is maintained above the strain point of the glass.

Discrete glass sheet cutting

A float glass forming chamber is cooled by circulation of molten metal through passages separate from the molten metal pool upon which the glass is supported.

Method and apparatus for cooling in a float glass forming operation

An apparatus and method for tempering glass is described. Glass sheets are passed through a tempering furnace along a predetermined generally horizontal path. The temperature of the sheets is measured by a pivoting pyrometer above the sheets and the furnace is regulated to achieve a zero temperature profile across the plates.

Position selectable glass surface temperature scanner

Monitoring the temperature profile of a series of glass sheets heated while conveyed through a furnace where they are heated preparatory to their rapid cooling required for tempering. Representative temperatures are taken at selected portions of the upper and lower surfaces of selected sheets to determine the temperature difference between the top and bottom surfaces and an indication of the temperature profile transverse to the direction of glass sheet movement. The temperature monitoring system may also include an additional temperature measuring station at a suitable position in a quenching zone where the heated glass sheets are rapidly cooled.

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Tarentum, PA, United States of America

Jack A Bricker