US3230062A - Method and apparatus for bending glass sheets - Google Patents

Method and apparatus for bending glass sheets Download PDF

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Publication number
US3230062A
US3230062A US140324A US14032461A US3230062A US 3230062 A US3230062 A US 3230062A US 140324 A US140324 A US 140324A US 14032461 A US14032461 A US 14032461A US 3230062 A US3230062 A US 3230062A
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US
United States
Prior art keywords
sheets
edges
bending
mold
unsupported
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
US140324A
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English (en)
Inventor
Jr Herbert A Leflet
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.)
Libbey Owens Ford Glass Co
Original Assignee
Libbey Owens Ford 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
Priority to NL133439D priority Critical patent/NL133439C/xx
Priority to NL283383D priority patent/NL283383A/xx
Application filed by Libbey Owens Ford Glass Co filed Critical Libbey Owens Ford Glass Co
Priority to US140324A priority patent/US3230062A/en
Priority to GB33791/62A priority patent/GB942736A/en
Priority to DEL42946A priority patent/DE1225347B/de
Priority to FR909552A priority patent/FR1333583A/fr
Priority to BE622523D priority patent/BE622523A/fr
Priority to ES280923A priority patent/ES280923A1/es
Priority to LU42386D priority patent/LU42386A1/xx
Application granted granted Critical
Publication of US3230062A publication Critical patent/US3230062A/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
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C03B23/027—Re-forming glass sheets by bending by gravity with moulds having at least two upward pivotable mould sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B32B17/10889—Making laminated safety glass or glazing; Apparatus therefor shaping the sheets, e.g. by using a mould

Definitions

  • the instant invention is based upon such discovery, that retarding the heating of the unsupported edges of the superimposed sheets during the initial period of the bending operation, together with shielding these edges during such period to prevent entry therein of foreign materials completely eliminates or at least greatly reduces the occurrence of pitting.
  • one rnethod or means which has been found to be especially effective in greatly reducing the pitting problem is the employment of a thin, flexible curtain or screen, e.g. of metal or glass cloth or other similar material, which may be carried by the bending apparatus and is positioned so as to extend or project downwardly over and in contact with the unsupported edges of the sheets during the initial heating period.
  • Another object of the invention is the provision of a novel method and apparatus for eliminating, or at least greatly reducing, the pitting of a plurality of glass sheets disposed in superimposed contacting relationship during the simultaneous heating and bending thereof.
  • a further object of the invention is to provide a method and apparatus for retarding the heating of the unsupported corresponding edges of a plurality of superimposed glass sheets during the initial heating period of a bending operation.
  • a still further object of the invention is to provide a novel bending mold including a flexible, interwoven meshed screen or curtain which is carried by the mold in a manner to project downwardly over and in contact with at least the unsupported edges of glass sheets positioned thereon when the sheets are in the relatively flat, unbent condition.
  • FIG. 1 is a longitudinal, cross sectional view of a bending apparatus in accordance with the present invention, and shown in its open position;
  • FIG. 2 is a longitudinal, cross sectional view of the mold shown in FIG. 1 when in its closed position;
  • FIG. 3 is a front elevational view of the mold in accordance with the invention, when in its open position;
  • FIG. 4 is a partial transverse, cross sectional view taken along the line 44 of FIG. 1;
  • FIG. 5 is a partial transverse, cross sectional view similar to FIG. 4 but illustrating a modified form of the invention.
  • the present invention provides a method for preventing the marring or pitting of the contacting surfaces of a plurality of glass sheets disposed in superimposed relationship by the steps of retarding the heating of the unsupported edges of the sheets during the initial heating period of the bending operation, and simultaneously preventing the entry of foreign matter present in the bending furnace atmosphere into the space between the contacting surfaces of the sheets caused by the bowing thereof.
  • the apparatus comprises a bending mold including a shaping surface which defines the curvature of the marginal area of the sheets to be bent thereon and is adapted to support a plurality of unbent flat sheets in stacked superimposed relationship.
  • the novel mold includes a support which extends above the shaping surface thereof, and particularly above the shaping surface portions which are not disposed in contact with the lowermost glass sheet when in the unbent condition.
  • the support in turn carries a thin curtain or shield member, for example, of metal cloth or an imperforate sheet material which projects downwardly over and in contact with those portions of the glass sheet edges which are initially unsupported by the mold shaping surfaces. In this manner then, the shield member acts to both retard the heating of the unsupported edge portions of the sheets as well as to effectively prevent the entry of foreign matter in the furnace atmosphere into the gap between the sheets as caused by the bowing thereof.
  • FIG. 1 an improved glass bending apparatus designated generally by the numeral 11.
  • the bending apparatus 11 for purposes of illustrating the present in vention, may suitably comprise a substantially rectangular mold 12 of the concave, hinged type which is used to simultaneously bend a plurality of glass sheets 13 and 14 supported in superimposed stacked relationship thereon to the complex curvatures required by present-day automobile Windshields and aircraft canopies.
  • the bending apparatus 11 also includes a supporting rack indicated generally at 15 which is substantially rectangular in shape and comprises spaced, longitudinal side rails 16 rigidly connected to one another at their opposite ends by end rails 17. As a means of guiding the rack through the glass bending furnace, a pair of spaced guide rails 18 are secured to the underside of the side rails 16 and may be associated with the conveyor rolls used in most bending furnaces.
  • the mold 12 is carried by or supported on the rack 15 by uprights or posts 19 spaced slightly inwardly from each of the opposite ends of the side rails 16 and rigidly secured to the upper surfaces thereof.
  • braces 20 are also employed and fixed to both the uprights 19 and the side rails 16.
  • the mold is of the general type commonly termed an outline or skeleton mold and comprises a movable center section 21 and opposite end sections 22 movably connected at their inner ends to the center section.
  • Each of the end sections and the center section have a portion of a shaping surface 23 formed thereon which conforms in both elevation and outline to the desired curvature of the glass sheets to be bent thereon.
  • the mold end sections 22 are pivotally connected to the center section 21 by hinges 24 and the entire mold 12 is carried on the rack 15 by transverse rods 25 secured to the end sections 22 and swingably supported at their ends in links 26.
  • the links 26 are also swingably connected at their upper ends to pins 27 that are fixed in the uprights or posts 19.
  • the end mold sections 22 are adapted to be moved from a closed position such as shown in FIG. 2 to an open position such as shown in FIG. 1.
  • the mold supports two or more fiat glass sheets 13 and 14 in a horizontal position prior to the bending thereof.
  • the sheets become softened upon reaching a temperature of about 1100 F. and tend to sag.
  • the mold end sections swing up wardly and inwardly and thus assist in bending the sheets into conformity with the shaping surfaces on the central and end mold sections.
  • a pair of support rods 30 are provided and extend longitudinally of the mold 12, one on either side thereof.
  • the rods 30 are positioned above the longitudinal extending shaping surface portions of the center and end mold sections by means of struts 31.
  • the struts 31 are secured at one end to the uprights or posts 19 and at their other end to generally U-shaped brackets 32 into which the ends of the rods 30 are inserted. Additional support is provided by the bars 33 which extend between and are fixed to the posts 19 and struts 31.
  • a thin, flexible curtain 34 which, for example, may be composed of interwoven glass fibers to provide a mesh size smaller than approximately 200, is aflixed to the rod and extends or hangs downwardly therefrom along substantially the entire length of the rod, i.e. between the inner facing surfaces of the brackets 32.
  • the flexible curtain member 34 is of a height which enables it to project downwardly past the longitudinal edges of the glass sheets when such are disposed in their unbent condition on the open mold, i.e. when only the transverse edges of the sheets are supported on the shaping surface.
  • the struts 31 preferably extend inwardly to a point such that the rods 30 mounted in the brackets 32 are disposed slightly inwardly of the longitudinal edges of the sheets as carried by the mold 12, i.e. are within the projected periphery of the shaping surfaces or at least the projected periphery of the glass sheet edges.
  • This positioning of the rods 30 assures that the flexible curtain 34 will hang in contact with the longitudinal edges of the sheets prior to movement of the mold sections into the closed position, such as shown in FIG. 2.
  • the curtain 34 effectively blocks off and prevents entry of foreign matter into the gap 29 produced by the bowing of the sheets 13 and 14 when same are initially heated and the mold 12 is in the open position.
  • the curtain 34 will prevent entry of dust particles or the like from the atmosphere into the gap 29, it does not physically prevent small particles of glass spalled ofi from the outermost, opposed inner surfaces of the longitudinal sheet edges from entering into the gap.
  • the provision of the curtain 34 in some manner effectively prevents this edge spalling, at least to any substantial or harmful degree, and it is believed that such is due to the much greater surface area presented by the curtain 34 than by the sheet edges.
  • spalling which to a great extent is caused by the initial rapid heating of the sheet edges, is substantially inhibited and the pitting problem, to any significant extent, eliminated.
  • the support rods 30 be positioned so that the hanging portion of the sheet 35 forming the curtain lies substantially entirely in essentially the same vertical plane as the edges of the glass sheets. This is necessary in the case of a rigid material to assure that the sheet 35 is contiguous with the edges of all of the superimposed glass sheets.
  • the mold 12 is first swung to the open position of FIG. 1 and a plurality of glass sheets, for example, the pair indicated at 13 and 14, are placed in superimposed stacked relationship thereon so that the transverse edges of the sheets are directly supported on the shaping surface portions 28 of the end sections 22, with the lowermost sheet 14 actually contacting these portions.
  • the sheets act as strut members to hold the mold in the open position.
  • the rods 30, together with the curtains 34 afiixed thereto, are then inserted into the brackets 32 so that the curtains hang downwardly over and in contact with the unsupported longitudinal edges of the sheets.
  • the mold is then ready to be passed through a conventional bending furnace.
  • the sheets Upon entry of the mold 12 and supported glass sheets 13 and 14 into the furnace, the sheets are exposed to radiant heat and in many instances, particularly where rather severe bends are required in certain portions thereof, to direct flames from gas burners suitably positioned in the furnace. Due to the shield members or curtains 34, however, the heating of the unsupported edges of the sheets at their outrnost portions is retarded. At the same time, of course, the curtains 34 being in contact with the unsupported edges effectively prevent the entry of dust particles and the like in the furnace atmosphere from being blown into the gap or opening 29 produced between these edges, -due to the bowing of the sheets during this initial heating period. The curtains remain in contact with the longitudinal edges until the sheets become softened to the point where they tend to sag.
  • a rack a mold carried by said rack, said mold including a shaping surface conforming in curvature to that of the sheets when bent and adapted to receive said sheets and support a portion of the edges thereof when the sheets are in a fiat unbent condition, a support carried by said rack so as to extend above said shaping surface, and a thin curtain of heat absorbing material fixed to said support, said curtain projecting downwardly from said support over and in contact with those portions of the glass sheet edges which are unsupported by said shaping surface when said sheets are in said unbent condition.
  • a rack a mold carried by said rack, said mold including a shaping surface conforming in curvature to that of the sheets when bent and adapted to receive said sheets and support a portion of the edges thereof when the sheets are in a fiat unbent condition, a support carried by said rack so as to extend above said shaping surface, and a thin, small mesh, flexible screen of heat absorbing material fixed to said support, said screen projecting downwardly from said support over and in contact with those portions of the glass sheet edges which are unsupported by said shaping surface when said sheets are in said unbent condition.
  • a sectionalized bending mold comprising -a plurality of mold sections each having shaping surfaces formed thereon, means mounting said mold sections for movement between an open position wherein said shaping surfaces are adapted to support only portions of the edges of the superimposed fiat glass sheets to be bent and a closed position in which said shaping surfaces form substantial continuations of each other and define the curvature to which the fiat sheets are to be bent, a plurality of.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Joining Of Glass To Other Materials (AREA)
US140324A 1961-09-25 1961-09-25 Method and apparatus for bending glass sheets Expired - Lifetime US3230062A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL133439D NL133439C (ko) 1961-09-25
NL283383D NL283383A (ko) 1961-09-25
US140324A US3230062A (en) 1961-09-25 1961-09-25 Method and apparatus for bending glass sheets
GB33791/62A GB942736A (en) 1961-09-25 1962-09-04 Method and apparatus for bending glass sheets
DEL42946A DE1225347B (de) 1961-09-25 1962-09-12 Verfahren und Vorrichtung zum gleichzeitigen Biegen einer Mehrzahl von im wesentlichen rechteckigen Glasplatten
FR909552A FR1333583A (fr) 1961-09-25 1962-09-14 Procédé et appareil pour cintrer des feuilles de verre
BE622523D BE622523A (ko) 1961-09-25 1962-09-17
ES280923A ES280923A1 (es) 1961-09-25 1962-09-19 Método y aparato para curvar simultáneamente una pluralidad de láminas de vidrio apiladas y superpuestas
LU42386D LU42386A1 (ko) 1961-09-25 1962-09-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US140324A US3230062A (en) 1961-09-25 1961-09-25 Method and apparatus for bending glass sheets

Publications (1)

Publication Number Publication Date
US3230062A true US3230062A (en) 1966-01-18

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ID=22490728

Family Applications (1)

Application Number Title Priority Date Filing Date
US140324A Expired - Lifetime US3230062A (en) 1961-09-25 1961-09-25 Method and apparatus for bending glass sheets

Country Status (8)

Country Link
US (1) US3230062A (ko)
BE (1) BE622523A (ko)
DE (1) DE1225347B (ko)
ES (1) ES280923A1 (ko)
FR (1) FR1333583A (ko)
GB (1) GB942736A (ko)
LU (1) LU42386A1 (ko)
NL (2) NL133439C (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103172254A (zh) * 2011-12-22 2013-06-26 太阳能公司 热调节玻璃弯曲装置以及方法
CN111776301A (zh) * 2020-06-02 2020-10-16 安徽巢湖南方膜业有限责任公司 一种玻璃钢化包装膜的贴合工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008095455A1 (de) * 2007-02-11 2008-08-14 Dieter Pfaltz Gebogenes und mittels giessharz laminiertes sicherheitsglas und das verfahren zur herstellung dieses sicherheitsglases

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US782967A (en) * 1904-10-22 1905-02-21 Victor Kinon Process of bending plate-glass.
US2608030A (en) * 1947-10-09 1952-08-26 Libbey Owens Ford Glass Co Mold for bending glass plates
US2872755A (en) * 1954-01-25 1959-02-10 Pittsburgh Plate Glass Co Apparatus for bending glass
US3069878A (en) * 1957-09-26 1962-12-25 Libbey Owens Ford Glass Co Method and apparatus for bending glass sheets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US782967A (en) * 1904-10-22 1905-02-21 Victor Kinon Process of bending plate-glass.
US2608030A (en) * 1947-10-09 1952-08-26 Libbey Owens Ford Glass Co Mold for bending glass plates
US2872755A (en) * 1954-01-25 1959-02-10 Pittsburgh Plate Glass Co Apparatus for bending glass
US3069878A (en) * 1957-09-26 1962-12-25 Libbey Owens Ford Glass Co Method and apparatus for bending glass sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103172254A (zh) * 2011-12-22 2013-06-26 太阳能公司 热调节玻璃弯曲装置以及方法
EP2794498A4 (en) * 2011-12-22 2015-07-29 Sunpower Corp HEAT REGULATING DEVICE FOR BENDING GLASS AND METHOD THEREFOR
CN111776301A (zh) * 2020-06-02 2020-10-16 安徽巢湖南方膜业有限责任公司 一种玻璃钢化包装膜的贴合工艺

Also Published As

Publication number Publication date
NL133439C (ko)
DE1225347B (de) 1966-09-22
GB942736A (en) 1963-11-27
ES280923A1 (es) 1963-01-16
FR1333583A (fr) 1963-07-26
LU42386A1 (ko) 1964-03-19
BE622523A (ko) 1963-03-18
NL283383A (ko)

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