To Reshape Preform By Flame Pressure Or Gravity Patents (Class 65/285)
  • Patent number: 8783064
    Abstract: The method for polishing glass products, comprises the following steps: specifying a contour or form or shape of the glass product; detecting the location or position of the glass product; calculating a path for a laser beam on the basis of the contour of the glass product and the location of the glass product; and scanning the path with the laser beam for polishing the glass product in order to fuse mold joints together or smoothen/polish them.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: July 22, 2014
    Assignee: Zwiesel Kristalliglas AG
    Inventor: Klaus Lesche
  • Patent number: 8701443
    Abstract: A glass molding system and a method of making glass articles using the glass molding system are disclosed. The glass molding system includes an indexing table, a plurality of enclosures arranged along the indexing table, and a plurality of stations defined on the indexing table such that each of the stations is selectively indexable with any one of the enclosures. At least one radiant heater is arranged in at least one of the enclosures. A radiation reflector surface and a radiation emitter body are arranged in the at least one of the enclosures. The radiation emitter body is between the at least one radiant heater and the radiation reflector surface and has a first surface in opposing relation to the at least one radiant heater and a second surface in opposing relation to the radiation reflector surface.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: April 22, 2014
    Assignee: Corning Incorporated
    Inventors: Darrel P Bailey, John Harold Brennan, Michael Joseph Dailey, Jr., Scott Winfield Deming, Karl David Ehemann, Keith Raymond Gaylo, David Joseph Kuhn, Brian Christopher Sheehan, Ljerka Ukrainczyk, Kevin Lee Wasson, Yuriy Yurkovsky
  • Patent number: 7900479
    Abstract: The invention relates to a method for treating the ends of glass rods in which glass rods are inserted into receptacles in a carrier and with the carrier are carried past a burner and at least one rail in an advancing direction, the flame of the burner melting at least one end of the glass rods and the glass rods being lifted by the rail in the receptacles and rolling on the rail so that the glass rods are made to rotate during the melting process.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: March 8, 2011
    Assignee: Schott AG
    Inventors: Johann Piegendorfer, Martin Zoettl
  • Patent number: 7681415
    Abstract: The invention relates to a method for treating the ends of glass rods in which glass rods are inserted into receptacles in a carrier and with the carrier are carried past a burner and at least one rail in an advancing direction, the flame of the burner melting at least one end of the glass rods and the glass rods being lifted by the rail in the receptacles and rolling on the rail so that the glass rods are made to rotate during the melting process.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: March 23, 2010
    Assignee: Schott AG
    Inventors: Johann Piegendorfer, Martin Zöttl
  • Patent number: 6983624
    Abstract: The invention relates to an apparatus for bending glass panels. An upper tier of successive mould carriages (9) defines a number of heating stations, the final one being an actual bending station (4b). A lower tier of successive mould carriages (9) defines a number of cooling stations (5, 6, 7), which are located underneath the heating stations. The mould carriages have an open-structured or otherwise highly heat transmitting floor (10). A pre-bending station (4a) preceding the bending station (4b) and at least the final preheating station (3b) have a floor (15), on top of which are radiation heating elements (16) positioned below a floor (10) of the carriage (9) for speeding up the heating of a bottom glass panel for preventing it from falling behind from the heating of a top glass panel.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: January 10, 2006
    Assignee: Tamglass Ltd. Oy
    Inventor: Erkki Yli-Vakkuri
  • Patent number: 6843074
    Abstract: A glass sheet is heated to a forming temperature in a heating furnace, the heated glass sheet is conveyed along a conveying plane defined by a plurality of rollers of a roller conveyer, and is moved up and down on the rollers according to the position of the glass sheet to curve a part of the conveying plane with respect to the glass sheet conveying direction to bend the glass sheet to have a desired curvature by its own weight. The rollers are curved rollers.
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: January 18, 2005
    Assignee: Asahi Glass Company, Limited
    Inventors: Youichi Nemugaki, Toshimitsu Sato
  • Patent number: 6357263
    Abstract: In bending a glass sheet, the load applied to an intermediate glass sheet can be equalized to improve the quality of a final glass sheet. For this purpose, a forming ring 1 comprises a first forming frame 15 and a second forming frame 16, and the swingable center of each of swingable frames 19, 20, which forms right and left portions of a second forming frame 16, is located at an intermediate position apart from a separation position from each of fixed frames 17, 18. By such arrangement, the intermediate glass sheet can be equally supported when the swingable frames 19, 20 are moved along the intermediate glass sheet and the intermediate glass sheet is transferred from the first forming frame 15 onto the second forming frame 16.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: March 19, 2002
    Assignee: Asahi Glass Company Ltd.
    Inventors: Toshimi Yajima, Masahiro Tsuchiya, Hiroshi Yamakawa, Masahiko Kobayashi, Katsuki Saito
  • Patent number: 6016669
    Abstract: An apparatus for applying heat to a rotatable workpiece is disclosed. A rotating lathe is provided for mounting a workpiece, for example a quartz tube, thereto so as to enable rotation of the workpiece. At least one translatable burner is coupled to a fuel source and an oxygen source for producing a flame. The burner is directed such that flame impinges upon the workpiece mounted on the rotating lathe. A first pulse control valve is coupled to and positioned between the translatable burner and the fuel source. A second pulse control valve is coupled to and positioned between the translatable burners and the oxygen course. The first and second pulse control valves are pulsed at a predetermined frequency to prevent the formation of a steady thermal boundary layer about the workpiece to improve the rate of heat transfer between the flame and the workpiece.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: January 25, 2000
    Assignee: General Electric Company
    Inventors: Sanjay Marc Correa, Alan S. Feitelberg
  • Patent number: 5992180
    Abstract: A glass plate is heated in a heating furnace and is bend-shaped to be a complexly curved glass plate while the glass plate is passed on curved rollers wherein support pads of a pushing mechanism push the complexly curved glass plate from an upstream side to a downstream side of a transferring device in a state that a rear edge of the complexly curved glass plate is supported by the support pads whereby the complexly curved glass plate is delivered to a cooling device side while a turning movement of the complexly curved glass plate is controlled during the transfer.
    Type: Grant
    Filed: August 5, 1998
    Date of Patent: November 30, 1999
    Assignee: Asahi Glass Company Ltd.
    Inventors: Masahiro Tsuchiya, Tsuyoshi Kawaguchi, Ken Nomura, Kohei Yoshino
  • Patent number: 5820650
    Abstract: A glass substrate is positioned between a chamber with a reduced pressure and a chamber filled with a heated helium, and the glass substrate is forcibly bent by the pressure difference and the heated helium gas into a uniform shape. The irradiation of laser light is carried out in this state to compensate the difference of annealing effects due to fine difference of deformation of the respective glass substrates.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: October 13, 1998
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Shunpei Yamazaki
  • Patent number: 5656052
    Abstract: A furnace is provided for the heating of glass sheets to be bent, whereby precise control of the temperature profile across a sheet may be achieved, resulting in improved control over the shape to which the sheet is bent. The furnace has at least one differential heating zone provided with a plurality of main heating elements, and at least one shield for directing heat radiated by said heating elements whereby a controlled differential heating of the glass sheet may be achieved. Transport means, e.g. wheeled boxes, are provided to advance the sheet through the furnace and bending means, e.g. gravity bending ring moulds, may bend the sheet either during, or subsequent to, the heating step.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: August 12, 1997
    Assignee: Pilkington Glass Limited
    Inventors: James Boardman, Ian Nichols Tetlow
  • Patent number: 5573566
    Abstract: A method of making a quartz dome for a reactor chamber from a substantially flat quartz disk. The quartz disk is placed on a graphite ring which is rotated. The quartz disk is heated until the disk is softened slightly and it begins to slump. The softened portion of the disk is drawn by a change in pressure to contact a fixed wiper blade. The wiper blade controls the size and shape of the deformation of the quartz disk to form the dome surface.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: November 12, 1996
    Assignee: Advanced Semiconductor Materials America, Inc.
    Inventors: Dane H. Anderberg, Lewis C. Barnett
  • Patent number: 5472469
    Abstract: A method and a furnace for bending glass sheets. Glass sheets are heated to a bending temperature by supporting them on a mould (11) and carrying them from one heating station to another. In a bending station (4), the glass sheet is heated for effecting a desired bending partially or entirely through the action of gravity. During a bending operation, the temperature distribution of a glass sheet is subjected to the action of convection blasting. By focusing the blast on the mid-section of a glass sheet it is possible to create a progressively curving pocket.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: December 5, 1995
    Assignee: Tamglass Engineering Oy
    Inventors: Erkki Yli-Vakkuri, Arto Kaonpaa, Tapio Salonen, Jukka Nikkanen
  • Patent number: 5437704
    Abstract: The invention relates to a method and a furnace for bending glass sheets. Glass sheets supported on ring molds are heated to a bending temperature and are carried from one heating station to another. In a heating and bending station, the glass sheet is heated for effecting a desired bending partially or entirely through the action of gravity. During a bending operation, the temperature distribution of radiation heat is adjusted. In the heating stations, the glass sheet is subjected to the action of convection blasting.
    Type: Grant
    Filed: October 6, 1993
    Date of Patent: August 1, 1995
    Assignee: Tamglass Engineering Oy
    Inventors: Erkki Yli-Vakkuri, Arto Kaonpaa, Tapio Salonen, Jukka Nikkanen
  • Patent number: 5281249
    Abstract: A method and apparatus for imparting a predetermined contour to an ophthalmic glass lens.The method comprises positioning a forming manifold in the base of a reshaping chamber, the upper surface of the manifold having a surface contour that is the reverse of the bottom contour surface of the reshaped lens, positioning the lens blank in the chamber, heating the lens blank to a temperature at which the blank deforms, and establishing a continuous, lateral flow of gas on the upper surface of the forming manifold whereby the glass is supported while it sags to the desired shape.The apparatus comprises a reshaping chamber, a source of heat to bring a lens blank to its deforming temperature, a forming manifold having an upper surface contour that is the reverse of the desired contour on the lower surface of the reshaped lens blank, and means to supply a continuous, lateral flow of gas on the upper surface of the manifold whereby the glass blank is supported while it deforms to the desired shape.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: January 25, 1994
    Assignee: Corning Incorporated
    Inventors: Leslie E. Hampton, John W. Nelson
  • Patent number: 4869745
    Abstract: The micropipette puller of this invention includes a pair of gripping jaws that pull a length of glass tubing in opposite directions. The source of heat is a laser and a beam is directed into a beam directing means, such as a lens or mirror, to refract or reflect the beam against the glass tubing between the gripping jaws. The mirror or lens may be oscillated at various rates and through selected angles in each direction to move the reflected beam a selected amount and at selected rates along a greater length of the glass tubing.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: September 26, 1989
    Inventor: Dale G. Flaming
  • Patent number: 4867776
    Abstract: Apparatus and method for forming an integral structure, such as a lens, on a fiber, such as an optical fiber, which includes a device which imparts centrifugal force to an end of the fiber while the end of the fiber is being heated. An arc or heat source which heats the end of the fiber can both rotate about the longitudinal axis of the fiber and move laterally with respect to the longitudinal axis of the fiber. The apparatus also includes a device for longitudinally moving the fiber relative to the arc. When a fiber is inserted into the apparatus, centrifugal force is exerted on the end of the fiber as the fiber is heated. The fiber is advanced longitudinally relative to the arc until a sphere of a predetermined size is formed. Then, depending upon the shape or lens desired, the sphere may be allowed to cool and be removed from the apparatus, or other operations are performed.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: September 19, 1989
    Assignee: Compaq Computer Corporation
    Inventor: David P. Sharp
  • Patent number: 4842628
    Abstract: A method of vitrifying a porous cylindrical article made out of glass soot, especially for manufacturing a preliminary blank for optical fibers. The article is heat-treated in a furnace in a vacuum or in an atmosphere that contains helium. The porous article is placed in a horizontal graphite tube in the furnace, is sintered therein for 20 to 40 minutes in a vacuum or in a helium atmosphere with reduced pressure at 1250.degree. to 1400.degree. C., and is subsequently vitrified by heat-treating the sintered article at first in the sintering atmosphere, while slowly rotating it in the hot graphite tube for 20 to 40 minutes at approximately 1450.degree. to 1600.degree. C. and then while rotating it in the graphite tube more rapidly than in the first stage for 10 to 30 minutes at approximately 1650.degree. to 1750.degree. C.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: June 27, 1989
    Assignee: Heraeus Quarzschmelze GmbH
    Inventors: Karl Kreutzer, Fritz Simmat, Anton Steinkohl, Wolfgang Englisch
  • Patent number: 4813995
    Abstract: In an apparatus for manufacturing containers out of glass, a parison is formed from a gob of molten glass and is transferred to a mould having a cavity in the shape of the required container. Instead of the conventional blowing operation, the parison within the mould is heated so that the parison flows to conform to the shape of the cavity. The heating may be by a gas burner and air may be blown on to a neck portion of the parison to cool it during heating of the parison.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: March 21, 1989
    Assignee: Emhart Industries, Inc.
    Inventors: Werner-Dieter Knoth, Hermann H. Nebelung
  • Patent number: 4755204
    Abstract: Curved glass is maufactured by supporting glass on a sag bending mould which is passed through a furnace. During initial heating of the glass on the mould, hot air is directed around the mould beneath the glass to minimize the temperature difference between the mould and the glass.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: July 5, 1988
    Assignee: Pilkington Brothers P.L.C.
    Inventors: James Boardman, Willem Wiechers
  • Patent number: 4705551
    Abstract: A machine for making and painting test tubes by painting open-ended tubes and then fusing and severing them to form individual test tubes.Substitutable paint applicators varying in width, adjustable in location relative to the open-ended tubes, apply paint thereto by means of wiping action caused by rotating said open-ended tubes while in engagement with said paint applicators. The open-ended tubes are then individually fused and severed intermediate their open ends to form, from each open-ended tube, two separate test tubes having painted bands of the desired width and at the desired location, including painted bands which are contiguous with the open ends of the test tubes.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: November 10, 1987
    Assignee: Chase Instruments Corporation
    Inventor: E. Howell Robinson, Jr.
  • Patent number: 4626269
    Abstract: A system for sealing a mount in a cathode-ray tube using first and second tiers of burners includes a first valve in an oxygen supply line and a third valve in a fuel supply line connected to the first tier, and a second valve in the oxygen supply line and a fourth valve in the fuel supply line connected to the second tier for controlling, respectively, the flow of oxygen and fuel therethrough. The system comprises a preignition timing relay responsive to a start signal and coupled to both the first and the third valves for effecting a preignition gas flow period. An ignition timer is responsive to the preignition timing relay and is coupled to both the first and the third valves and to an igniter for effecting an ignition latchup interval at the end of the preignition gas flow period. A first timing relay is responsive to the ignition timer and is coupled to both the first and the third valves for effecting a first-tier gas flow period following the preignition gas flow period.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: December 2, 1986
    Assignee: RCA Corporation
    Inventor: Chester J. Halgas
  • Patent number: 4618355
    Abstract: A method for sealing a mount including a wafer in a neck of a stationary cathode-ray tube comprises positioning a first tier of burner tips completely around the neck such that the burner tips are aimed nonradially along directions tangent to a first circle, the plane of the first circle being aligned along the wafer. The first tier of burner tips is split into at least first and second radial segments, each segment being connected to means for moving the segment toward and away from the neck. The first tier of burner tips, while remaining stationary, provide a vortical pattern of flames around the neck. The radial segments are then removed from around the stationary neck sufficiently to allow the tube to proceed along a conveyor line.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: October 21, 1986
    Assignee: RCA Corporation
    Inventors: Jack F. Otto, Michael A. Colacello
  • Patent number: 4589902
    Abstract: Apparatus for sealing a mount including a wafer into a neck of a cathode-ray tube oriented along an axis comprises two tiers of burner tips. The first tier is disposed completely around the axis at a first distance therefrom and similarly aimed nonradially along directions tangent to a first circle. The second tier of burner tips is disposed completely around the axis below the first tier at a second distance from the axis and similarly aimed nonradially along directions tangent to a second circle. The first distance and the diameter of the first circle are greater, respectively, than the second distance and the diameter of the second circle.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: May 20, 1986
    Assignee: RCA Corporation
    Inventors: Michael A. Colacello, Emil V. Fitzke, Jack F. Otto
  • Patent number: 4530712
    Abstract: A pipette puller is provided for drawing glass or quartz tubing into micropipettes. A fixed clamp and movable clamp are utilized and between the clamps a furnace is provided which has an opposing pair of elongated heating elements. The heating elements are supported by binding posts of high thermal conductivity and relatively large mass, which provides relatively low thermal inertia of the heating elements.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: July 23, 1985
    Inventor: J. David Kopf
  • Patent number: 4502878
    Abstract: An apparatus and method for tubulating a glass barrel including a glass lathe with the tubing in one chuck and a barrel holding device in the other chuck having a pair of spring members to engage the openings of the barrel and hermetically seal the barrel with an air pressure source to induce pressure to the inside of the barrel with the method including heating the end of the tubing and the point on the barrel for attachment, blowing a hole out through the point and welding the tube over the hole while the parts are spinning on the lathe.
    Type: Grant
    Filed: April 5, 1984
    Date of Patent: March 5, 1985
    Inventor: Edwin D. Smith
  • Patent number: 4465501
    Abstract: According to the method of aseptic and antiparticulate opening of a sealed glass ampul, one end of the ampul is submitted to a powerful thermal flux produced by flame tongue generating sources on a very localized zone for a time period sufficient to obtain melting of the glass while maintaining the adjacent portion thereof at lower temperature for preserving its rigidity, such time period being the shorter the smaller that volume of gas contained in the ampul which is quickly brought to an increased temperature and pressure to cause the ampul to be opened up in the considered molten zone.
    Type: Grant
    Filed: November 2, 1982
    Date of Patent: August 14, 1984
    Assignee: Millipore S.A.
    Inventor: Jean Lemonnier
  • Patent number: 4372773
    Abstract: A method is disclosed for making capillary glass liners for use in ink jet writing devices. The capillary glass blanks are suspended within a heating coil which melts the glass locally so that the blank stretches to form two well defined jet liner nozzles. Liners with inlet and outlet orifices and with bent or angled outlet nozzles are also made.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: February 8, 1983
    Assignee: Gould Inc.
    Inventor: Laszlo Halasz
  • Patent number: 4272274
    Abstract: This invention relates to shaping glass sheets and particularly to a mold capable of shaping glass sheets having many different outline shapes but bent to the same radius of curvature. Such molds have dimensions larger than those of a family of windows of a given radius of curvature but different outline shapes. Such molds comprise a solid block of refractory material comprising a plurality of smooth, curved, upwardly facing, elongated shaping members extending continuously across an entire dimension of said mold and separated by transversely extending grooves that extend completely across the entire dimension of the shaping mold and have sufficient width and depth to permit clearance for raising the mold above a horizontal path of glass sheet travel defined by glass conveying elements.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: June 9, 1981
    Assignee: PPG Industries, Inc.
    Inventors: Robert G. Frank, Rudy Canonaco, Richard V. Posney
  • Patent number: 4204854
    Abstract: Apparatus and a method disclosed for use in bending heated sheets of glass (G) transported generally horizontally on a conveyor (16) within a furnace heating chamber incorporate a holder (20) located above the conveyor in a spaced relationship such that a heated sheet of glass can be transported under the holder. Gas such as air is blown upwardly from below the conveyor against the heated sheet of glass such that the sheet is moved upwardly into engagement with the holder. The upwardly blown gas is provided by an array of gas jet pumps (60) positioned below the conveyor. A mold ring (44) is then movable under the holder to receive the glass sheet for bending. Holder (20) is disclosed as including curved and planar surfaces and as including curved and planar rings. A vacuum may be drawn with the holder embodiments having the surfaces so as to assist the upwardly blown gas in lifting the sheet of glass off the conveyor.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: May 27, 1980
    Inventors: Harold A. McMaster, John S. Nitschke, Dean M. Nitschke
  • Patent number: 4203754
    Abstract: An improved glass bending device is disclosed for bending and conveying glass sheets. The glass bending device includes a rod having a curved portion, a rotary tubular member engaged about the rod, and a plurality of rings disposed between the rod and the tubular member. In the improvement, the rotary tubular member has internal threading, a plurality of annular support means having external threading are disposed along spaced locations within the tubular member in mating relation with the internal threading thereof, and each of the rings are affixed within one of the annular support means.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: May 20, 1980
    Assignee: Saint-Gobain Industries
    Inventor: M. Pierre Potier
  • Patent number: 4193785
    Abstract: Apparatus for forming relatively sharp angled bends in a flat sheet of glass including a sectionalized gravity mold supported on a frame having electrically conducting means thereon including a plurality of bus bars mounted on one of the end members of the frame in spaced relation thereto for engagement by electrically conducting probes to deliver electric current to said electrically conducting means. A rigid, unitary, one-piece electrical insulator substantially coextensive with said frame end member is interposed between the bus bars and the frame end member to electrically insulate the latter from said bus bars.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: March 18, 1980
    Assignee: Libbey-Owens-Ford Company
    Inventor: Harold A. Bailey
  • Patent number: 4184864
    Abstract: Apparatus for bending one or more glass sheets to a sharp bend by a combination of overall heating and localized heating using an outline glass sheet bending mold comprising one or more electroconductive heating elements in the form of a ribbon. Means is provided to tension the ribbon so that it does not wrinkle when the ribbon expands thermally due to the application of electrical energy thereacross. The ribbon is tensioned by one or more electrodes. Means is provided to maintain the electrodes attached to the mold in case the ribbon breaks.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: January 22, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Thomas J. Reese
  • Patent number: 4123246
    Abstract: This invention relates to shaping and quenching glass sheets by roll forming to either simple or compound curvatures comprising a longitudinal component of curvature about an axis of bending transverse to a path of movement by a controlled, repeatable program of roll forming without causing the glass sheets to stop their forward movement during their shaping. A series of glass sheets are heated and then rapidly cooled while conveyed along a path defined by a conveyor system comprising longitudinally spaced rotating rolls. The path includes a longitudinally curved portion that imparts a longitudinal component of curvature to the glass sheets after the latter are softened by heat.
    Type: Grant
    Filed: January 26, 1978
    Date of Patent: October 31, 1978
    Assignee: PPG Industries, Inc.
    Inventor: Randall S. Johnson
  • Patent number: 4077791
    Abstract: An apparatus for forming relatively sharp angled bends in a flat sheet of glass including a sectionalized gravity mold structure having electrical conducting means terminating in improved contact assemblies engageable with electrically conducting frit lines or paths formed on a glass sheet. The contact assemblies are mounted on the mold structure for movement along with the glass sheet relative to the mold during bending and offer continuous positive clamping contact with the electro-frit circuitry at all times.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: March 7, 1978
    Assignee: Libbey-Owens-Ford Company
    Inventor: Waldemar W. Oelke
  • Patent number: 4054437
    Abstract: The sheet to be curved, such as glass at a softening temperature, is advanced on a fixed curved bed formed by a series of curved rods having different angles of inclination to form an ascending convex bed with an increasing curvature profile. The sheet is thus gradually raised and simultaneously curved by sagging of the edges. The curved rods have aligned end sections mounted in the same horizontal plane and the inclinations progressively increase. The bed is followed by a bed of constant curvature profile formed by curved rods having the same inclination. Means are provided for independently adjusting the inclination of each rod. Particular ranges of spacing and rate of advance are given.
    Type: Grant
    Filed: May 25, 1976
    Date of Patent: October 18, 1977
    Assignee: Saint-Gobain Industries
    Inventors: Heinz Ueberwolf, Hans-Pieter Siemonsen
  • Patent number: 4054438
    Abstract: The sheet to be curved, such as glass at a softening temperature, is advanced on a fixed curved bed formed by a series of curved rods having angles of inclination which provide the bed with an increasing curvature profile. The edges of the sheet gradually sag as the sheet advances. The curved bed is followed by a bed having a constant profile formed by curved rods having the same inclination. The peaks of the rods advantageously lie in a straight line. Means are provided for simultaneously changing the inclinations of the curved rods when sheets of a different curvature are to be made.
    Type: Grant
    Filed: May 25, 1976
    Date of Patent: October 18, 1977
    Assignee: Saint-Gobain Industries
    Inventor: Claude Presta
  • Patent number: 4028086
    Abstract: An apparatus for bending and tempering heat-softened glass sheets by differentially cooling the opposite surfaces of the sheets to warp or bow the sheets to desired curvatures. The sheets are conveyed through the tempering section by a series of upper and lower conveyor rolls, each of which is formed of a two-piece construction and curved in a manner providing adequate support for the opposite ends thereof and permitting easy access into the inner regions of the tempering section.
    Type: Grant
    Filed: February 25, 1976
    Date of Patent: June 7, 1977
    Assignee: Libbey-Owens-Ford Company
    Inventors: Donald D. Rahrig, Robert G. Revells