US3087317A - Apparatus for bending glass sheets - Google Patents

Apparatus for bending glass sheets Download PDF

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Publication number
US3087317A
US3087317A US743920A US74392058A US3087317A US 3087317 A US3087317 A US 3087317A US 743920 A US743920 A US 743920A US 74392058 A US74392058 A US 74392058A US 3087317 A US3087317 A US 3087317A
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US
United States
Prior art keywords
sheet
shaping
mold
sections
bending
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
US743920A
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English (en)
Inventor
Frank J Carson
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 LU37289D priority Critical patent/LU37289A1/xx
Application filed by Libbey Owens Ford Glass Co filed Critical Libbey Owens Ford Glass Co
Priority to US743920A priority patent/US3087317A/en
Priority to BE579359A priority patent/BE579359A/fr
Priority to DEL33448A priority patent/DE1107376B/de
Priority to ES0250270A priority patent/ES250270A1/es
Priority to FR798217A priority patent/FR1227869A/fr
Application granted granted Critical
Publication of US3087317A publication Critical patent/US3087317A/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

Definitions

  • the present invention relates generally to apparatus for bending glass sheets or plates, and more particularly to an improved bending mold.
  • the shaping rail is substantially rectangular in plan view and a heat retaining member or strain bar having its periphery contoured to the desired outline for the pattern cut sheet, but somewhat smaller as compared thereto, is located within the rectangular shaping rail and spaced downwardly therefrom.
  • the residual heat within the heat retaining member prevents the portion of the sheet thereabove from cooling at the same rate as intermediate portions of the sheet outwardly therefrom between the periphery of the strain bar and the shaping rail which causes the intermediate sheet portions to set in compression.
  • the scoring tool is moved over the glass along a path through the sheet portion set in compression so that the resultant pattern cut sheet will have its peripheral edge in compression.
  • a glass bending mold adapted to produce a bent glass sheet having a desirable stress pattern therein and also adapted to support the sheet intermediate the ends thereof without inducing undesirable stress patterns in the sheet.
  • Another object of the invention is to provide an improved glass bending mold adapted to form a desired stress pattern in the sheet and also to support the sheet intermediate the ends thereof prior to and during bending.
  • a further object of the invention is to provide a glass bending mold adapted to form a desired stress pattern in the sheet and to support the sheet intermediate the ends thereof and to accomplish both of the above results through use of a minimum amount of metal adjacent the glass.
  • FIG. 1 is a plan view of an improved bending mold provided by the present invention in the open position
  • FIG. 2 is a transverse section taken along line 22 of FIG. 1;
  • FIG. 3 is a fragmentary plan view of the improved bending mold provided by the present invention in the closed position
  • FIG. 4 is a longitudinal section taken along line 4-4 of FIG. 1;
  • FIG. 5 is an enlarged fragmentary perspective view of the improved sheet support and stress forming member of the invention.
  • FIGS. 1 to 4 there is shown a glass bending apparatus 10 constructed in accordance with the invention and comprising a substantially rectangular rack or support frame 11 having vertical support posts 12 extending upwardly from each of the four corners thereof for pivotally supporting the bending mold proper.
  • This mold 13 is of the skeleton type and includes a center section 14 and a pair of oppositely disposed movable end sections 15 immediately adjacent the opposite ends of the center section 14 and forming substantially continuations thereof.
  • Each of the mold end sections 15 comprises a substantially triangular or V-shaped shaping rail 16 formed as an inverted T and having a relatively narrow upper surface for receiving the bent glass sheet in contact therewith.
  • the center mold section 14 comprises a pair of spaced, substantially straight parallel shaping rails 17 having a relatively shallow curvature and of the same configuration aligned with the innermost ends of the substantially V-shaped end section rails 16 and preferably connected thereto by hinges 18.
  • a heat retaining member Carried within the confines of the shaping rail sections forming the mold center section and mold end sections is a heat retaining member in the form of a strain bar 19 of substantially greater width than the relatively narrow upper surface of the respective shaping rail.
  • the strain bar 19 is normally disposed below the sheet contacting surfaces of the shaping rails and has its outermost edges shaped to conform to the outline of the pattern to be cut from the bent sheet but somewhat smaller.
  • the strain bar 19 comprises a triangular or substantially V-shaped end section 20 rigidly secured to each triangular shaped end rail section 16 by transverse rods 21 or in some other suitable manner.
  • each of the end sections 20 has its upper relatively wide surface 22 spaced from the mold shaping surface a substantially equal distance throughout its entire length and also has the upper surface 22 contoured to a configuration which is substantially identical with the end section shaping rails 16.
  • the portion of the strain bar 19 carried by the mold center section 1- 1 includes a pair of fixed spaced substantially parallel portions 23 and intermediate movable substantially parallel portions 24 which, as will be later set forth in detail, comprise an important feature of the present invention.
  • the fixed portions 23 are located bea neath the shaping rails 17 at the opposite ends thereof and are carried by rods 21 which extend between the shaping rails.
  • the relatively Wide or flat upper surface of the fixed portions are contoured to conform to the shaping surface of the center section rail 17.
  • Each center or intermediate portion 24 is supported for movement from an elevated position wherein a flat glass sheet is placed on the mold to a lowered position when the sheet is bent, which lowered position places the intermediate portions in alignment with the fixed spaced portions 23 to form substantially continuations thereof.
  • the adjacent ends of the respective strain bar sections 23 and 24 are beveled in such a manner as to provide a substantially continuous strain bar when the mold is closed.
  • a pair of curved elongated arms 25 having their outermost ends secured to the transversely extending pivot rods 26 of the end section which are swingably carried by the corner posts 12 and their innermost ends pivotally carrying downwardly disposed links '27 having their lowermost ends pivotally secured to rods 28 depending from the opposite ends of the bar section 24-.
  • the intermediate bar sections 24 Carried by the intermediate bar sections 24 .are a plurality of sheet support blocks 29 preferably formed of a refractory material which will not fuse to the glass sheet. As shown in FIG. 4 the support blocks 29 adjacent the center of the intermediate bar section 24 have a greater height .as compared to the blocks 29 carried at the opposite ends of the intermediate bar section 24 so that the upper surface of the plurality of blocks lie in a horizontal support plane which is defined by the upper surfaces of the triangular shaping rail sections 16 at the apices thereof. Thus when the mold is in the position of FiG. 4 the glass sheet or sheets 30 are supported at their opposite ends upon the rail sections 16 and intermediate their ends upon the plurality of blocks 29.
  • the blocks 29 are secured to the edges of the bar sections 24 toward the shaping rails 17 when in their mounted position upon the bar sections 24. Due to this arrangement the intermediate bar sections 24 present an unbroken width substantially equal in Width to the fixed sections 23 exposed to the glass sheet as shown in FIG. 1. There is thus presented to the unders'urface of the glass sheet a substantially continuous strain bar of substantially equal width along its entire closed length and thus as will be later set forth .a stress pattern is formed in the glass sheet 30 through the action of the strain bar.
  • the movable sections 24 of the strain bar 19 are relatively wider than fixed sections and 23 and project outwardly thereof toward the shaping rails.
  • the blocks 29 are fitted over the outer projecting edges of the bar sections and for this purpose the blocks are provided with slots in which the bar sections are received.
  • the bar sections 24 may be notched along the edges toward the rails 17 to prevent movement of the blocks 29 along the bar sections in a direction which is substantially parallel to the longitudinal axis of the mold 13.
  • the mold sections are swung to the open position of FIGS. 1, 2 and 4 and a sheet placed upon the mold.
  • the arms lower the intermediate bars 24 downwardly thus lowering the central portion of the sheet 30 and depositing said sheet onto the center mold section.
  • the blocks 29 are lowered below the shaping surface of the center section shaping rails 17 while the intermediate bars 24- are carried into Contact and alignment with the stationary bars 23.
  • the residual heat remaining in the shaping rail sections and the strain bar 19 causes the portion of the glass sheet immediately thereabove to cool at a decreased rate as compared to an intermediate sheet portion therebetween thus setting the enclosed sheet portion in compression.
  • the block size sheet After the block size sheet has been cooled it is removed from the mold and out along a surface line between the shaping rail sections and the strain bars through the area of the glass sheet set in compression thus providing a pattern cut sheet having its peripheral edge in compression which is more shock resistant.
  • Apparatus for bending blank size glass sheets which are to be subsequently cut to a pattern outline a frame having supporting members extending upwardly therefrom, a link member swingably carried by each of said supporting members, a bending mold including a pair of end sections and an intermediate section mounted for movement from an open position to a closed position on said link members, heat retaining means including spaced fixed members and spaced movable members positioned within said pattern outline, said fixed members being rigidly secured to said end sections, spaced legs extending downwardly from said spaced movable members, arms secured to said pivot members and extending above the lowermost ends of said legs, links swingably connected to said arms and said legs whereby said movable members will be moved above said intermediate section when said movable mold sections move to said open position, and a plurality of spaced sheet engaging members secured to said movable members to support the glass sheets when the mold is in the open position.
  • Apparatus for bending blank size glass sheets as claimed in claim 1 wherein the spaced movable members have substantially greater width than the spaced fixed members whereby the width of the exposed portion of said movable member adjacent the sheet engaging members is substantially equal to the Width of the fixed members.
  • a skeleton-type mold including a substantially continuous shaping rail made up of a plurality of sections and having a shaping surface thereon, a substantially continuous skeleton-type heat retaining member located inwardly of said shaping rail and comprising a plurality of separate portions arranged in end to end relation, means mounting one of said portions in fixed relation to and below the shaping surface of an adjacent section of said shaping rail, and means mounting another of said portions for movement relative to said shaping rail between a lower position below the shaping surface .and an upper sheet supporting position above the shaping surface of an adjacent section of said shaping rail.
  • said shaping rail includes end sections and an intermediate section together with means mounting said end sections for movement between the open and closed positions of the mold
  • said heat retaining member includes a portion adjacent each of said end sections that is fixedly mounted relative thereto.
  • said shaping rail includes end sections and an intermediate section together with means mounting said end sections for movement between the open and closed positions of the mold, the movable portion of said heat retaining member is located adjacent and is movable relative to said intermediate section of the shaping rail, and means are provided between said movable portion of said heat retaining member and an end section for moving the former into sheet supporting position upon movement of the latter between said open and closed positions.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US743920A 1958-06-23 1958-06-23 Apparatus for bending glass sheets Expired - Lifetime US3087317A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
LU37289D LU37289A1 (enrdf_load_stackoverflow) 1958-06-23
US743920A US3087317A (en) 1958-06-23 1958-06-23 Apparatus for bending glass sheets
BE579359A BE579359A (fr) 1958-06-23 1959-06-04 Appareils pour courber des lames de verre
DEL33448A DE1107376B (de) 1958-06-23 1959-06-15 Vorrichtung zum Biegen von Glasscheiben
ES0250270A ES250270A1 (es) 1958-06-23 1959-06-20 Aparato para curvar hojas de vidrio
FR798217A FR1227869A (fr) 1958-06-23 1959-06-22 Appareil pour cintrer des feuilles de verre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US743920A US3087317A (en) 1958-06-23 1958-06-23 Apparatus for bending glass sheets

Publications (1)

Publication Number Publication Date
US3087317A true US3087317A (en) 1963-04-30

Family

ID=24990713

Family Applications (1)

Application Number Title Priority Date Filing Date
US743920A Expired - Lifetime US3087317A (en) 1958-06-23 1958-06-23 Apparatus for bending glass sheets

Country Status (6)

Country Link
US (1) US3087317A (enrdf_load_stackoverflow)
BE (1) BE579359A (enrdf_load_stackoverflow)
DE (1) DE1107376B (enrdf_load_stackoverflow)
ES (1) ES250270A1 (enrdf_load_stackoverflow)
FR (1) FR1227869A (enrdf_load_stackoverflow)
LU (1) LU37289A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5974834A (en) * 1995-12-22 1999-11-02 Saint-Gobain Vitrage Method for bending and/or tempering sheet glass and bending frame therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11157857A (ja) * 1997-11-19 1999-06-15 Asahi Glass Co Ltd ガラス板の曲げ成形方法および装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2240349A (en) * 1938-10-14 1941-04-29 Frank W Preston Method of and apparatus for making structural glass
US2348278A (en) * 1940-12-26 1944-05-09 Johnston Glass Co Inc Apparatus for forming combination curved and straight glass
US2646647A (en) * 1948-09-10 1953-07-28 Libbey Owens Ford Glass Co Process and apparatus for bending and tempering glass
FR1097088A (fr) * 1953-03-12 1955-06-29 Libbey Owens Ford Glass Co Cintrage des feuilles de verre
US2720729A (en) * 1952-10-03 1955-10-18 Ford Motor Co Glass bending fixture
GB745992A (en) * 1953-03-12 1956-03-07 Libbey Owens Ford Glass Co Glass bending apparatus
FR1124919A (fr) * 1954-04-07 1956-10-22 Libbey Owens Ford Glass Co Appareil de cintrage de feuilles de verre
FR1128601A (fr) * 1954-07-16 1957-01-08 Libbey Owens Ford Glass Co Dispositif de cintrage de feuilles de verre
GB768982A (en) * 1954-06-21 1957-02-27 Pittsburgh Plate Glass Co Improvements in or relating to glass bending molds

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2240349A (en) * 1938-10-14 1941-04-29 Frank W Preston Method of and apparatus for making structural glass
US2348278A (en) * 1940-12-26 1944-05-09 Johnston Glass Co Inc Apparatus for forming combination curved and straight glass
US2646647A (en) * 1948-09-10 1953-07-28 Libbey Owens Ford Glass Co Process and apparatus for bending and tempering glass
US2720729A (en) * 1952-10-03 1955-10-18 Ford Motor Co Glass bending fixture
FR1097088A (fr) * 1953-03-12 1955-06-29 Libbey Owens Ford Glass Co Cintrage des feuilles de verre
GB745992A (en) * 1953-03-12 1956-03-07 Libbey Owens Ford Glass Co Glass bending apparatus
FR1124919A (fr) * 1954-04-07 1956-10-22 Libbey Owens Ford Glass Co Appareil de cintrage de feuilles de verre
GB764448A (en) * 1954-04-07 1956-12-28 Libbey Owens Ford Glass Co Apparatus for producing bent glass sheets
GB768982A (en) * 1954-06-21 1957-02-27 Pittsburgh Plate Glass Co Improvements in or relating to glass bending molds
FR1128601A (fr) * 1954-07-16 1957-01-08 Libbey Owens Ford Glass Co Dispositif de cintrage de feuilles de verre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5974834A (en) * 1995-12-22 1999-11-02 Saint-Gobain Vitrage Method for bending and/or tempering sheet glass and bending frame therefor

Also Published As

Publication number Publication date
DE1107376B (de) 1961-05-25
ES250270A1 (es) 1959-12-16
BE579359A (fr) 1959-12-04
FR1227869A (fr) 1960-08-24
LU37289A1 (enrdf_load_stackoverflow)

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