Ppg Industries, Inc.

Ppg Industries Ohio, Inc.

Rudolph A Karlo

George R Claassen

Irvin A Wilson

Jeffrey L Marietti

Robert G Frank

David B Rayburn

Mark M Savka

John L McLaughlin

John J Ewing

DeWitt W Lampman

William B Zimmerman

Richard V Posney

W Jason Skeen

Steven M Horcicak

George B Claassen

Lawrence S Letzkus

Michael Zibert

Samuel E Behanna

The present invention is directed to an apparatus for thermal treatment of glass and method and thermally treated glass therefrom. The apparatus is capable of supporting the glass during thermal treatment such as tempering, annealing, bending, and/or shaping which can include any cooling or quenching to remove heat or any combination of these. The apparatus is a support member like a ring or outline mold with a horizontal surface suitable for contacting the glass. The support member has at least a surface with or without a coating for contact with the glass of one or more metals having a thermal conductivity such that the glass heated for shaping cools at a rate not much slower than the cooling rate of unsupported sections of the glass. Suitable metals include those with a thermal conductivity of greater than around 16 BTU/(hour&times;feet&times;&deg; F.). When a coating covers at least a portion of the support, the coating can give the support member more heat resistance and/or anti-corrosiveness and/or abrasion resistance to improve durability. Also the support member can be the shaping rail of a windshield or backlite shaping iron.

Apparatus for thermal treatment of glass and method and thermally treated glass therefrom

The invention provides an articulated bending mold for shaping heat softened substrates, e.g., glass sheets, into curved shapes. The bending mold has a central portion with at least one, and preferably two, pivoting end sections. A biasing assembly is mounted on the side of the mold between the end section pivot points, preferably outboard of the end section pivot points and in proximity to an outer side of the end section. The biasing assembly includes a weight arm with a linkage assembly mounted on one end of the weight arm and connected to the end section, preferably at or near an outer corner of the end section.

Bending mold having side mounted weight assemblies and method of use

The present invention discloses a method and apparatus for shaping glass sheets to deeply sagged configurations using a lower outline mold and an upper shaping mold while minimizing marking of the sheets by shaping molds. The outline mold includes a support rail which generally corresponds to the desired curvature of a peripheral portion of the sheets to be shaped and supports the glass sheets as they are heated and sagged by gravity to a preliminary shape. The outline mold and the upper mold are then moved relative to each other to position the molds either in close proximity to each other or to press the upper mold against the glass sheets. Pressurized gas is then directed from the mold to at least the unsupported central portions of the preliminarily shaped sheets, to urge these unsupported portions downward and shape the sheets to a desired configuration.

Pressure forming of glass sheets

The present invention discloses a method for shaping glass sheets to deeply sagged configurations using a lower outline mold and an upper shaping mold while minimizing marking of the sheets by shaping molds. The outline mold includes a support rail which generally corresponding to the desired curvature of a peripheral portion of the sheets to be shaped and supports the glass sheets as they are heated and sagged by gravity to a preliminary shape. The outline mold and the upper mold are then moved relative to each other to position the molds either in close proximity to each other or to press the upper mold against the glass sheets. Pressurized gas is then directed from the mold to at least the unsupported central portions of the preliminarily shaped sheets, to urge these unsupported portions downward and shape the sheets to a desired configuration.

A flexible shaping ring for shaping heat softened glass sheets lifts a heat softened glass sheet and presses it against the shaping surface of an upper mold. As the shaping ring presses the marginal edge portion of the sheet against the upper mold, its shaping surface deforms to generally conform to a corresponding portion of the upper mold. A press ring subsequently contacts the shaping ring and presses it against the upper mold to further shape the marginal edge portion of the glass sheet and ensure the marginal edge completely conforms to the shape of the upper mold.

Combination flexible/rigid ring mold

Apparatus for handling a hot glass sheet during conveyance from a hot atmosphere to a cold atmosphere comprising a ring-like member having an upper surface engaging a glass sheet outline that consists essentially of a phenolic resin reinforced with fibers composed of an aromatic polyamid composition and a support ring attached to the ring-like member in facing relation to the ring-like member and sufficiently smaller in the dimensions than those of the ring-like member to permit the ring-like member to interpose between the support ring and a supported edge of a glass sheet so as to provide thermal insulation as well as shielding between the metal support rings and the edge of the glass sheet.

Tempering ring design

An extended surface pressing mold for a horizontal press bending arrangement. The lower mold provides a glass sheet engaging surface having a first portion which complements and generally parallels a first portion of an upper sheet engaging surface of an aligned upper mold, a wing portion which extends from the first portion of lower mold and is nonparallel to a corresponding second aligned portion of the sheet engaging surface of the upper mold, and a ring portion positioned outwardly from the wing portion and generally complementing a third aligned portion of the upper sheet engaging surface of the upper mold near a portion of the perimeter of the glass sheet. The ring portion moves from the first position wherein the ring portion is in a non-engaging position relative to the heat softened glass sheet to a second position wherein the ring portion contacts and engages a perimeter portion of the heat softened glass sheet to press the perimeter portion against the third portion of the upper mold.

Extended surface pressing mold and method of sheet shaping

A ring-like member for use in lifting a glass sheet from a given path to the vicinity of a vacuum holder at a shaping station has its movement coordinated mechanically with stop means that engages the leading edge of a glass sheet at an edge locating position when said ring-like member is below said given path and mechanically retracts from said edge locating position in unison with said ring-like member when said ring-like member moves in the direction of the thickness of said glass sheet to engage and lift said glass sheet. This mechanical coordination of movements avoids rubbing the glass sheet edge in the direction of the glass sheet thickness during its lifting without requiring complicated and expensive coordinating equipment.

Growing community of inventors

Creighton, PA, United States of America

Rudolph A Karlo