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Патент USA US3087321

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April 30, 1963
Filed June 23, 1958
2 Sheets-Sheet 1
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April 30, 1963
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Filed June 25, 1958
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BY ?zzugdafyea, 6.
Patented Apr. 30, 1963
stress pattern in the sheet and also to support the sheet
Frank J. Carson and Herbert A. Leflet, In, Toledo, Ohio,
assignors to Lihhey-tJwens-Ford Glass Company,
Toledo, Ohio, a corporation of Ohio
Filed dune 23, 1958, Ser. No. ‘743,92ii
11 Claims. (til. 65-238)
The present invention relates generally to apparatus for
bending glass sheets or plates, and more particularly to an
improved bending mold.
In the bending of glass sheets to form bent sheets hav
ing their peripheral edges in compression, thus providing
a more shock resistance sheet, there have been two gen
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 re
sults through use of a minimum amount of metal adja
cent the glass.
Other objects and advantages of the invention will be
come more apparent during the course of the following
description when taken in connection with the accom
panying drawings.
In the drawings, wherein like numerals are employed
to designate like parts throughout the same:
FIG. 1 is a plan view of an improved bending mold
erally accepted types of bending molds used. One of these 15 provided by the present invention in the open position;
molds, upon which a pattern cut sheet is bent, is provided
FIG. 2 is a transverse section taken along line 2—2
with a shaping rail or surface of such a size that when the
FIG. 1;
glass sheet is bent into conformity therewith the marginal
FIG. 3 is a fragmentary plan view of the improved bend
periphery of the sheet overhangs the rail and, therefore,
ing mold provided by the present invention in the closed
cools without being materially affected by the residual heat 20
within the rail and thus sets in compression.
FIG. 4 is ‘a longitudinal section taken along line 4-4
In the other type of mold, which is used for bending
FIG. 1; and
blank or block size glass sheets which are cut to pattern
FIG. 5 is an enlarged fragmentary perspective view of
outline after being bent, the shaping rail is substantially
the improved sheet support and stress forming member
rectangular in plan view and a heat retaining member 25
of the invention.
or strain bar having its periphery contoured to the desired
With reference now to the drawings and particularly
outline for the pattern cut sheet, but somewhat smaller
to FIGS. 1 to 4 there is shown a glass bending appara
as compared thereto, is located within the rectangular
tus 10 constructed in accordance with the invention and
shaping rail and spaced downwardly therefrom. After the
comprising a substantially rectangular rack or support
glass sheet is bent into contact with the shaping rail,
frame 11 having vertical support posts 12 extending up
and while the mold is passing through the furnace anneal
wardly from each of the four corners thereof for pivot
ing zone, the residual heat within the heat retaining mem
ally supporting the bending mold proper. This mold 13
ber prevents the portion of the sheet thereabove from cool
is of the skeleton type and includes a center section 14 and
ing at the same rate as intermediate portions of the sheet
a pair of oppositely disposed movable end sections 15
outwardly therefrom between the periphery of the strain 35 immediately adjacent the opposite ends of the center sec
bar and the shaping rail which causes the intermediate
tion 14 and forming substantially continuations thereof.
sheet portions to set in compression. In cutting a sheet
bent in such a manner to form a patterned sheet, 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 com
Such a mold and a procedure for bending block size
sheets for subsequent cutting to pattern shape was dis
Each of the mold end sections 15 comprises a substan
tially triangular or V-shaped shaping rail 16 formed as
an inverted T and having a relatively narrow upper sur
face for receiving the bent glass sheet in contact there
with. The center mold section 14 comprises ‘a pair of
spaced, substantially straight parallel shaping rails 17 hav
ing a relatively shallow ‘curvature and of the same con
?guration aligned with the innermost ends of the substan
closed in our earlier application Serial No. 574,329, ?led 45 tially V-shaped end section rails 16 and preferably con
March 27, 1956, now Patent No. 2,893,170, issued July
nected thereto by hinges 18.
Carried within the con?nes of the shaping rail sections
7, 1959.
As explained in the earlier case, when relatively long
forming the mold center section and mold end sections is
glass sheets are to be bent in a mold of the last mentioned
a heat retaining member in the form of a strain bar 19
type, it is also desirable to support the sheet intermediate
the ends thereof to prevent excessive de?ection of the
sheet when supported on the mold prior to the bending
thereof. Various types of intermediate supports for the
sheet have been used with varying degrees of success, and
which usually comprised auxiliary movable arms or pivots 55
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.
As best shown in FIGS. 1 and 2 the strain bar 19
comprises a triangular or substantially V-shaped end sec
tion 20 rigidly secured to each triangular shaped end rail
which extend upwardly from the mold and engaged the
glass sheet. However, the excessive use of metal in the
areas of the glass sheet adjacent the mold is not desirable
section 16 by transverse rods 21 or in some other suitable
since the mass of the metal adversely affects the proper
heating of the sheet and may set-up undesirable stress 60 manner. As shown in FIG. 1 each of the end sections
20 has its upper relatively wide surface 22 spaced from
patterns in the sheet during the cooling thereof. In ac
mold shaping surface a substantially equal distance
cordance with the present invention, there is provided a
throughout its entire length and also has the upper sur
glass bending mold adapted to produce a bent glass sheet
face 22 contoured to a con?guration which is substan
having a desirable stress pattern therein and also adapted
65 tially identical with the end section shaping rails 16.
to support the sheet intermediate the ends thereof without
The portion of the strain bar 19 carried by the mold
inducing undesirable stress patterns in the sheet.
center section 1-41 includes a pair of ?xed spaced substan
‘It is, therefore, an important object of the invention to
provide a novel and improved bending mold for bending
glass sheets and particularly sheets of substantial length.
Another object of the invention is to provide an im
proved glass bending mold adapted to form a desired
tially parallel portions 23 and intermediate movable sub
stantially parallel portions 24 which, as will be later set
forth in detail, comprise an important feature of the
present invention. The ?xed portions 23 are located be
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 ?xed portions are contoured to conform to the shap
ing 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
intermediate bars 24 downwardly thus lowering the
central portion of the sheet 30 and depositing said sheet
onto the center mold section. During the remaining small
increment of closing movement 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.
After the sheet has been bent and is being annealed the
residual heat remaining in the shaping rail sections and
alignment with the ?xed spaced portions 23 to form sub 10 the strain bar 19 causes the portion of the glass sheet
stantially continuations thereof.
As shown‘ in FIG. 4 the adjacent ends of the respective
immediately thereabove to cool at a decreased rate as
compared to an intermediate sheet portion therebetween
strain bar sections 23 and 24 are beveled in such a manner
as to provide a substantially continuous strain bar when
thus setting the enclosed sheet portion in compression.
position shown in FIG. 3. When the mold sections move
from the open to the closed position the arms 25 are ro
terns in the sheet.
It is to be understood that the forms of the invention
30 herewith shown and described is to be taken as a preferred
After'the block size sheet has been cooled it is removed
the mold is closed. To support the elongated intermedi 15 from the mold and out along a surface line between the
ate or center bar portion 24 for movement from the ele
shaping rail sections and the strain bars through the area
vated to the lowered position there is provided a pair of
of the glass sheet set in compression thus providing a pat
curved elongated arms 25 having their outermost ends
tern cut sheet having its peripheral edge in compression
secured to the transversely extending pivot rods 26 of the
which is more shock resistant.
end section 15 which are swingably carried by the corner
From the description of the improved bending mold of
posts 12 and their innermost ends pivotally carrying down
the present invention it will be apparent that not only is
wardly disposed links '27 having their lowermost ends
there provided apparatus for supporting a glass sheet
pivotally secured to rods 28 depending from the opposite
intermediate its ends but also apparatus for producing the
ends of the bar section 24-. When the mold is in the open
desired stress pattern in the glass sheet, both of such
position the various parts assume the position shown in 25 objects being accomplished with a minimum amount of
FIGS. 1, 2 and 4 and when the mold moves from the
metal in the mold that is in close proximity to the glass
open to the closed position the various parts assume the
thus minimizing the formation of undesirable stress pat
tated downwardly thus carrying the intermediate bar sec
tions 24 therewith and into alignment With the strain bar
sections 23.
embodiment of the same, and that various changes may be
be resorted to without departing from the spirit of the in
Carried by the intermediate bar sections 24 .are a plu
vention or the scope of the subjoined claims.
rality of sheet support blocks 29 preferably formed of a
We claim:
refractory material which will not fuse to the glass sheet.
1. Apparatus for bending blank size glass sheets which
As shown in FIG. 4 the support blocks 29 adjacent the
are to be subsequently cut to a pattern outline, a frame
center of the intermediate bar section 24 have a greater
having supporting members extending upwardly there
height .as compared to the blocks 29 carried at the op
from, a link member swingably carried by each of said
posite ends of the intermediate bar section 24 so that the
supporting members, a bending mold including a pair of
upper surface of the plurality of blocks lie in a horizontal 40 end sections and an intermediate section mounted for
support plane which is de?ned by the upper surfaces of the
movement from an open position to a closed position on
triangular shaping rail sections 16 at the apices thereof.
said link members, heat retaining means including spaced
Thus when the mold is in the position of FiG. 4 the glass
?xed members and spaced movable members positioned
sheet or sheets 30 are supported at their opposite ends
within said pattern outline, said ?xed members being
upon the rail sections 16 and intermediate their ends 45 rigidly secured to said end sections, spaced legs extend
upon the plurality of blocks 29.
ing downwardly from said spaced movable members,
As shown in FIGS. 1 and 3 the blocks 29 are secured
‘arms secured to said pivot members and extending above
to the edges of the bar sections 24 toward the shaping rails
the lowermost ends of said legs, links swingably connected
17 when in their mounted position upon the bar sections
to said arms and said legs whereby said movable mem
24. Due to this arrangement the intermediate bar sections
bers will be moved above said intermediate section when
24 present an unbroken width substantially equal in
said movable mold sections move to said open position,
Width to the ?xed sections 23 exposed to the glass sheet as
and a plurality of spaced sheet engaging members secured
shown in FIG. 1. There is thus presented to the under
to said movable members to support the glass sheets when
s'urface of the glass sheet a substantially continuous strain
the mold is in the open position.
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.
As Will be seen in FIG. 1, the movable sections 24 of
2. Apparatus for bending blank size glass sheets as
claimed in claim 1, wherein the sheet engaging members
are secured to the movable members along the outermost
edges thereof.
3. Apparatus for bending blank size glass sheets as
the strain bar 19 are relatively wider than ?xed sections 60 claimed in claim 1, wherein the sheet engaging members
20 and 23 and project outwardly thereof toward the
extend upwardly from the movable members in varying
shaping rails. The blocks 29 are ?tted over the outer
distances whereby the uppermost surfaces of the sheet
projecting edges of the bar sections and for this purpose
engaging members lie in the same plane.
the blocks are provided with slots in which the bar sections
4. Apparatus for bending blank size glass sheets as
are received. If desired the bar sections 24 may be 65 claimed in claim 1, wherein the sheet engaging members
notched along the edges toward the rails 17 to prevent
are formed of a refractory material which Will not fuse
movement of the blocks 29 ‘along the bar sections in a
to the glass sheets.
direction which is substantially parallel to the longitudinal
5. Apparatus for bending blank size glass sheets as
axis of the mold 13.
claimed in claim 1, wherein the spaced movable members
In bending a glass sheet or pair of sheets upon the
have substantially greater width than the spaced ?xed
novel mold of the present invention the mold sections are
whereby the width of the exposed portion of
swung to the open position of FIGS. 1, 2 and 4 and a
member adjacent the sheet engaging mem
sheet placed upon the mold. During the bending of the
bers is substantially equal to the Width of the ?xed mem
sheet and while the sections are moving from the open
to the closed position of FIG. 3 the arms 25 lower the 75
6. Apparatus for bending glass sheets, 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 ar
ranged in end to end relation, means mounting one of
said portions in ?xed relation to and below the shap
ing surface of an adjacent section of said shaping
rail, and means mounting another of said portions for
and said heat retaining member includes a portion ad
jacent each of said end sections that is ?xedly mounted
relative thereto.
11. Apparatus as de?ned in claim 6 wherein said shap
ing rail includes end sections and an intermediate section
together with means mounting said end sections for move
ment 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 inter
section of the shaping rail, and means are pro
movement relative to said shaping rail between a lower 10
vided between said movable portion of said heat retaining
position below the shaping surface .and an upper sheet
member and an end section for moving the former into
supporting position above the shaping surface of an ad
sheet supporting position upon movement of the latter
jacent section of said shaping rail.
said open and closed positions.
7. An apparatus as de?ned in claim 6 vand wherein
said movable portion of the heat retaining member has an 15
References Cited in the ?le of this patent
area wider than an adjacent ?xed portion of said heat
retaining member to provide a lateral extension on said
movable portion ‘and sheet supporting members are car
Preston ______________ __ Apr. 29, 1941
ried on .and con?ned to said lateral extension.
Boyles et a1 ____________ __ May 9, 1944
8. Apparatus as de?ned in claim 7 wherein said heat
Bamford et a1. ________ __ July 28, 1953
retaining member is of metal and said sheet supporting
members of a refractory material.
9. Apparatus as de?ned in claim 6 wherein the ad
jacent ends of the separate portions of said heat retaining
member are beveled to overlap in one position of said 25
movable portion and provide substantial continuity to said
skeleton-type heat retaining member.
10. Apparatus as de?ned in claim 6 wherein said shap
ing rail includes end sections and an intermediate section
together with means mounting said end sections for move 30
ment between the open and closed positions of the mold,
Rugg ________________ __ Oct. 18, 1955
France _______________ __ Feb. 9,
France _______________ __ July 9,
France ______________ __ Aug. 27,
Great Britain _________ _._ Mar. 7,
Great Britain _________ __ Dec. 28,
Great Britain _________ __ Feb. 27,
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