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US2251160A - Apparatus for casehardening glass plates - Google Patents

Apparatus for casehardening glass plates Download PDF

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Publication number
US2251160A
US2251160A US234988A US23498838A US2251160A US 2251160 A US2251160 A US 2251160A US 234988 A US234988 A US 234988A US 23498838 A US23498838 A US 23498838A US 2251160 A US2251160 A US 2251160A
Authority
US
United States
Prior art keywords
glass
flights
screens
sheets
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US234988A
Other languages
English (en)
Inventor
Owen William
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pittsburgh Plate Glass Co filed Critical Pittsburgh Plate Glass Co
Priority to US234988A priority Critical patent/US2251160A/en
Priority to GB27603/39A priority patent/GB533115A/en
Priority to FR860837D priority patent/FR860837A/fr
Application granted granted Critical
Publication of US2251160A publication Critical patent/US2251160A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/052—Tempering or quenching glass products using gas for flat or bent glass sheets being in a vertical position
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/20—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames
    • C03B35/202—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames by supporting frames
    • C03B35/205—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames by supporting frames the glass sheets being in a vertical position

Definitions

  • the invention relates to apparatus for case hardening glass sheets and is particularly adapted for use with thin glass although capable of use with sheets of any thickness.
  • One of the objects of the invention is the provision of a simple compact apparatus which will permit the treatment of the glass to case harden it without marring the surfaces and with a minimum of breakage.
  • an apparatus which has a large capacity and whose use requires a of hand labor, the work of the single operator being restricted to the feeding of the sheets to the apparatus and the control of the motor which provides the step by step feed of the sheets through the heating and chilling zones.
  • Figure 1 is a vertical section through an apparatus.
  • Fig. 2 is a side elevation.
  • Fig. 3 is a detail perspective view showing the method of supporting the glass sheets on the screens.
  • Fig. 4 is a perspective view showing a modification.
  • Fig. 5 is a detail sectional view through one of the plates for supporting the glass sheets as employed in the Fig. 4 construction.
  • 6 are vertical I-beams constituting the framework of the ap-' paratus, such I-beams being anchored to the floor, as indicated at I in Fig. 1 and having their upper ends supported on the horizontal I-beams 8 carried by the superstructure of the-buildin in which the apparatus is housed.
  • a vertical furnace 9 Slotted at its upper and lower ends and provided with suitable heating means for bringing the temperature of the furnace to the desired point.
  • Any suitable heating means may be employed, the one shown being electrical resistance elements I0 located in the walls of the furnace, such resistance elements being supplied with current from the terminals H and I2.
  • Mounted beneath the furnace and in alinement therewith are the cooling means for chilling the glass sheets treated in the apparatus.
  • This means comprises a'pair of headers l3, 13 having distributed over their front sides the outlet nozzles I4. These headers are supplied with air under pressurefrom the pipes l5, l5.
  • Each header is supported at its ends upon a pair of eccentricslB, l6 carried by shafts I], ll, such shafts being mounted in suit--
  • a further object is the provision of sheets.
  • the endless screen 23 passes at its upper and lower ends around the drums 21 and 28, such drums being mounted on the shafts 29 and 30.
  • the shaft 29 is carried by suitable bearings 3
  • the screen 23 passes at its upper and lower ends around the drums 33 and 36, the drum 33 being mounted upon a shaft 35 carried by fixed bearings 36 securedto the posts 6, while the drum 34 is mount.- ed upon a shaft 31 carried by bearings 38 slidable on the flanges of the I-beams 6 so that the screen is tensioned by the weight of the drum 34 and shaft 37.
  • the drums 21 and 33 are driven from the motor 33 by means of the chain 40 passing around a sprocket on the shaft of the motor and over the sprockets 4
  • the upright contiguous flights of the conveyor screens are thus moved together or synchronously as a unit through the heating chamber of the furnace 3.
  • Theglass sheets 43 which are carried through the furnace and past the chilling means by the screens, are fed to the apparatus just above the drum 33 by the operator. Such sheets are supported against downward movement with respect to the screens during theirdownward travel by the means shown most.
  • Such means comprises a plate 44 of heat resisting metal provided with the teeth 45 and are attached to the screen 23 by means of suitable pins or bolts 46.
  • the purpose of the teeth is to give a minimum of contact between the edge of, the glass sheet and the supporting plate, and a cush ioning effect is preferably provided for by the use of small bodies a of asbestos wool cemented to the teeth 45.
  • the plate 44 is preferably slotted, as indicated at 46a to reduce any tendency to warp under the heat conditions encountered in the furnace.
  • the plates 44 are distributed along the screen 23 at suitable intervals, as indicated in Fig. 1, so that while one sheet of glass is being heated in the furnace, the next sheet below is in position for cooling between the chilling devices.
  • An arm 48a pivoted at 48b on the post 6 carries a roll 480 which serves to hold the glass sheet against the screen 23 until the lower edge of such sheet is closely adjacent the horizontal conveyor 41, later described.
  • a horizontal conveyor is provided in the form of an endless belt 41 which extends laterally and passes around pulleys, such as 48, at the ends of the device, the conveyor being driven by suitable means which are not shown.
  • the pulley 48 is mounted upon a shaft 49 which is carried by extensions projecting from the lower ends of the bearing members 32 so that the end of the conveyor 41 is maintained in fixed relation with respect to the lower end of the endless screen 23.
  • the adjacent vertical flights of the screens 23 and 24 are given a step by step movement downward through the furnace 9 and past the headers I3, l3 by starting and stopping the motor 39 at will.
  • a sheet of glass is heated to the softening point in the furnace 9 and at the same time the sheet of glass carried by the screens below it is chilled by the air blasts from the nozzles M.
  • the movement of the screens to shift the heated plate to chilling position between nozzles is relatively fast so that the chilling of the glass sheet occurs very quickly after the heating step has been completed.
  • the opposing flights of the screens 23 and 24 press upon opposing surfaces of the glass sheets as they pass through the furnace and past the chillin means so that such faces are maintained in true vertical planes during the treatment.
  • the screen employed may be of widely varying mesh and construction, but is in all cases relatively light in weight and is preferably of heat resisting material, such as nickel chromium.
  • Figs. 4 and 5 illustrate a modification which differs from that of Figs. 1 to 3 only in the character of the supporting screen.
  • the s pporting screen consists entirely of vertical strands 50 which are suitably spaced and pass around drums at their upper and lower edges as in the construction heretofore described, only the upper drums 5
  • the spacing of the wires 50 is maintained by means of the transverse plates 53, 53 of heat resisting metal, such as stainless steel, which are welded to the wires.
  • These plates 53, 53 act as the supports for the glass sheets and are similar in construction to the plates 44 heretofore described in connection with the apparatus of Figs. 1 to 3.
  • the plates 53 are preferably provided on their rear sides with the spikes 54 shown in Fig. 5.
  • the drums in all types of construction are preferably covered with asbestos fabric so that the spikes 54 penetratethe material and provide the necessary driving contact.
  • the wires 50 in conjunction with the cross members 53 constitute in effect a coarse screen, and it will be understood that the term screen as used in defining the invention is of relatively broad scope.
  • endless conveyor screens having upright flights disposed in substantially parallel contiguous relation for engaging opposite sides of the glass sheet, means connected to the screens for driving them synchronously, means for supporting the glass sheet between said flights, heating means receiving said flights for travel therethrough, air blast directing means on opposite sides of the flights for directing chilling air blasts through said flights from opposite directions after they have passed through the heating means, and means for supporting said heating means and .said air blast directing means in juxtaposed relation.
  • endless conveyor screens having upright flights disposed in substantially parallel contiguous relation for engaging opposite sides of the glass sheet, means connected to the screens for driving them synchronously, means for supporting the glass sheet-between said flights, heating means receiving said flights for travel therethrough, air blast directing means on opposite sides of the flights for directing chilling air blasts through said flights from opposite directions after they have passed through the heating means, means for supporting said heating means and said air blast directing means in juxtaposed relation, and discharging means disposed in coacting relation with said flights for feeding the glass sheet therefrom to a glass transporting means.
  • endless conveyor screens having upright flights disposed in substantially parallel contiguous relation for engaging opposite sides of the glass sheet, means connected to the screens for driving them synchronously, one of said screens having supporting means upon which the glass sheet rests as it is held in an upright position between said flights, heating means receiving said flights for travel therethrough, air blast directing means on opposite sides of the flights for directing chilling air blasts through said flights from opposite directions after they have passed through the heating means, and means for supporting said heating means and said air blast directing means in juxtaposed relation.
  • heating means for reducing the glass sheets to softening temperature sets of air blast directing means disposed in opposed relation at horizontally spaced locations and in juxtaposed relation to the heating means, endless conveyor screens having uprightsubstantially parallel contiguous flights passing through the heating means and between the sets of air blast directing means,
  • one of said screens having thereon spaced elements to determine the position of the glass sheets in spaced relation according to the spacing between the heating means and the air blast directing means whereby when one glass sheet is sheets to softening temperature, sets 01' air blast V directing means disposed in opposed relation at horizontally spaced locations and in juxtaposed relation to the heating means, endless conveyor screens having upright substantially parallel contiguous flights ,passing through th heating means and between the sets of air blast directing means, transverse groups of glass supporting pointed elementsspaced longitudinally upon said 1 screens to determine the position of the glass v sheets in spaced relation according to the spacing between the heating means and the air blast directing means whereby when one glass sheet is disposed in the heating means, the next adjacent contiguous relation for engaging oppositesides of.
  • drums receiving the upper extremities of the conveyor screens and carrying the latter in vertically suspended relation, means for rotatably supporting the drums horizontally, means connected tothe' drums to drive them synchronously, a floating drum suspended in the lower extremity of each endless screen and constituting a tensioning weight for such screen,
  • heating means including vertically slidable bearing supports rotatably connected to each lower-floating drum, heating means receiving said upright flights for travel therethrough, air blast directing means on opposite sides of the flights for directing chilling air blasts through said flights from opposite directions after they have passed through the heating means, and means for supporting said heating means and said air blast directing means in juxtaposed relation.
  • upright endless conveyor screens having upright flights, disposed in substantially parallel contiguous relation for engaging opposite sides of the glass sheet, drums receiving the upper extremities of the conveyor screens and carrying the latter in vertically suspended relation, means for rotatably supporting the drums horizontally, one of said drums having its axislspaced vertically from the axis of the other drum, means connected to the drums to drive them synchronously, a rotatably supported drum receiving the lower extremity of each endless screen, heating means receiving said upright flights for travel therethrough, air blast directing means on opposites'ides of-theflights for directing chilling air blasts through said flights from opposite directions after they have passed through the heating 'means, and means for suppbrting said heating means and said air blast directing means in juxtaposed relation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
US234988A 1938-10-14 1938-10-14 Apparatus for casehardening glass plates Expired - Lifetime US2251160A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US234988A US2251160A (en) 1938-10-14 1938-10-14 Apparatus for casehardening glass plates
GB27603/39A GB533115A (en) 1938-10-14 1939-10-10 Improvements in apparatus for tempering glass sheets
FR860837D FR860837A (fr) 1938-10-14 1939-10-13 Procédé et appareil pour la trempe des feuilles de verre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US234988A US2251160A (en) 1938-10-14 1938-10-14 Apparatus for casehardening glass plates

Publications (1)

Publication Number Publication Date
US2251160A true US2251160A (en) 1941-07-29

Family

ID=22883596

Family Applications (1)

Application Number Title Priority Date Filing Date
US234988A Expired - Lifetime US2251160A (en) 1938-10-14 1938-10-14 Apparatus for casehardening glass plates

Country Status (3)

Country Link
US (1) US2251160A (fr)
FR (1) FR860837A (fr)
GB (1) GB533115A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866299A (en) * 1955-02-14 1958-12-30 Cie Reunies Glaces Et Verres Method for the manufacture of tempered safety glass especially intended for use in automobiles
US3119680A (en) * 1952-06-10 1964-01-28 Saint Gobain Apparatus for tempering glass
FR2327966A1 (fr) * 1975-10-15 1977-05-13 Libbey Owens Ford Co Appareil et procede de manipulation de feuilles relativement rigides

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2129704B2 (de) * 1970-06-22 1974-02-21 Saratowskij Filial Gosudarstwennowo Nautschno-Issledowatelskowo Instituta Stekla, Saratow (Sowjetunion) Verfahren zum Härten von Tafelglas und Vorrichtung zur Durchführung des Verfahrens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119680A (en) * 1952-06-10 1964-01-28 Saint Gobain Apparatus for tempering glass
US2866299A (en) * 1955-02-14 1958-12-30 Cie Reunies Glaces Et Verres Method for the manufacture of tempered safety glass especially intended for use in automobiles
FR2327966A1 (fr) * 1975-10-15 1977-05-13 Libbey Owens Ford Co Appareil et procede de manipulation de feuilles relativement rigides

Also Published As

Publication number Publication date
GB533115A (en) 1941-02-06
FR860837A (fr) 1941-01-24

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