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Патент USA US2406939

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‘Sept. 3, V1946.‘
Filed Jan.‘ 27,1942
019/456 H. B01065’.
(Ittornéé _
Patented Sept. 3, 1946
James H. Boicey, Toledo, Ohio, assignor to Libbey
Owens-Ford Glass Company, Toledo, Ohio, at
, corporation of Ohio
Application January 27-, 1942,, Serial ‘No. 428,382
'2 Claims.
( CI. ‘20-56)
The present invention relates to vlaminated
glass glazing units and to ‘the mounting thereof.
shield‘ or window construction comprising two
transparent panels to and l I mounted in edge to
Although the laminated glass glazing units of
edge relation in a supporting frame l2 and se
this ‘invention are not restricted to any particu
lar use, they have been primarily ‘designed for ‘
"and are of especial utility in glazing the wind
cured to one another at their adjacent edges by
shield and/or window openings in airplanes‘and
a glazing bar or post [3. Each transparent panel
Ill and II consists of a laminated glass unit com
prising two sheets of glass It and I5 and a ther
other aircraft.
moplastic interlayer IE5 interposed therebetween
.An object of the‘ invention‘is‘ to provide an
and bonded thereto to provide a unitary struc
improved type of laminated glass glazing unit
and means for mounting two of such units in edge
to edge relation in such a manner that the units
will be e?ectively secured together and at the
The glass sheets l4 and I 5 may consist of ordi
nary plate or window glass and may also be either
fully tempered ‘or semi-tempered or any desired
same time permitted to move or yield relative to
combination of glass sheets may be used. ‘ ‘On
one another without disturbing the connection
the other hand,_‘the plastic interlayer I6 is pref
erably made up of a plurality and, as here shown, '
Another object of the invention is to provide
an improved laminated glass glazing unit includ
ing two sheets or plates of_ glass and an inter
six‘ ‘relatively thin sheets of plastic I‘! to 22, pref
erably formed of a polyvinyl acetal resin.
such resin which has been used is polyvinyl butyr
acetal resin and this resin may be plasticized
with from 15 to 30 parts dibutyl sebaoate per 100
posed layer of thermoplastic adherent thereto,
with the plastic interlayer extending beyorid‘the
edges of thelglass sheets to provide a ?exible
parts of resin by weight. However, different plas
tics varying in‘ thickness and physical character
attaching ?ange, and being further characterized
by the fact that the attaching ?ange is ‘offset
istics may be employed as the invention is not
limited to the use of any particularresin, class
‘of resins‘, cellulosic derivative or the like; Also,
the thickness of the plastic sheets, as well as the
with respect to the center of the ‘plastic inter
layer so that, when two of the glazing units are
associated with one another in edge to edge re
lation, the respective attaching ?anges ‘overlap
‘number employed, will dependupon how thick it
plastic interlayer it.
and plastic, considera
one another in such a way that the outer‘ surfaces
is desired to make the
of the two units will be in alignment or flush with 30 When selecting the glass
one another.
tion should be given to
A further object of the invention is to provide
which the ?nished unit is
the particular use to
to be put, since in some
an improved laminated glass glazing unit ofithe
installations, the unit will be subjected to greater
above character, either ?at or curved, which
l stresses and strains and likewise to greater pres
carries as a, permanent and integral part of its 1,;
whole a metal reinforcing member embedded in
‘ Itlwill be noted that the plastic sheets l1, l8
the extended portion of the plastic interlayer
and projecting inwardly of the edges of the glass
sheets to provide a metal-plastic attaching flange
and LE] terminate flush‘ with the edges of the glass
for receiving therethrough the means for secur- .3
ing two of the units together in edge to edge
Other objects and advantages of the invention
to form a composite metal-plastic attaching
flange A. The metal reinforcing member 23 may
be formed of steel, tin, aluminum, galvanized
In the drawing, wherein like numerals are
employed to designate like parts throughout the
.Fig. .1 is a plan view of two laminated glass
glazing units provided by the invention ‘and
mounted in edge to edge relation;
Fig. 2 is a horizontal section ‘taken substan
tially on line 2—-2 of Fig. 1;
Fig. 3 is a transverse section through an edge ‘ "
portion of one of the units; and
Fig. 4 is a view similar to Fig. 2 but showing a
slightly modi?ed type of unit.
With‘ reference‘ now to the drawing and par
ticularly to Figs. 1 to 3, there is disclosed a wind
sheets M and i5, while the plastic sheets 20 and
22 extend beyond the edges of the glass sheets
as indicated at 20’ and 22’ respectively. Dis
posed between the extended portions 26’ and 22'
of the plastic sheets 20 and 22 is’ a reinforcing
member 23'co-mprising a strip of relatively thin,
preferably ?exible, metal bonded to the plastic
will become more apparent during the course of
the following description, when taken in connec—
tion with the accompanying drawing.
sure diiierentials than the others.
‘metal or the ‘like and, while the thickness thereof
‘mayjvary, it may bementioned, by way of exam
ple, that when using aluminum the thickness
thereof may be approximately .020 to .030 of an
inch. ‘The metal reinforcing member 23 also
preferably projects inwardly of the edges of the
glass sheets I4 and It as shown and, while the
distance the ‘metal extends inwardly mayvary,
P'for‘the aver‘agesize light or pane a ‘distance of
approximately ‘1/4 inch is suggested. Obviously,
the plastic sheet 2| is relatively smaller than the
glass sheets to compensate for the presence of me
60 metal reinforcement 23. With the above de
30, a relatively stronger mounting is provided, in
scribed arrangement, it will be seen that the
metal-plastic attaching ?ange A is offset with
respect to the center of the plastic interlayer 23.
That is to say, the attaching ?ange is closer to
that there is less danger of shearing, tearing or
stretching of the extended plastic when the unit
is subjected to relatively high internal pressures
such as is used in the pressurized cabins of air
one sheet of glass than the other. In other
words, the thickness of the attaching ?ange A is .
one-half the total thickness of the plastic inter
The type of structure shown in Fig. 4
is therefore of vparticular utility for use in glaz~
ing stratosphere planes in which pressurized cab
layer l6 and is disposed immediately adjacent
ins or other compartments are provided to obvi
one of the glass sheets.
In mounting the two glazing units I0 and l I 10 ate the necessity for each occupant of the plane
in edge to edge relation in the supporting frame
having an individual oxygen supply. Another
application for this type of installation is in the
[2, the said units are reversely positioned so that
turrets of airplanes, the installation affording
the attaching ?anges A thereof overlap one an
maximum viewing area and minimum visual in
other as shown in Fig. 2, with the combined thick
ness of the two ?anges equaling the over-all 15 terference.
thickness of the plastic interlayers I6. With such
It is to be understood that the forms of the
an arrangement, the glass sheets of the two units
invention herewith shown and described are to be
taken as illustrative embodiments only of the
will be in alignment and the outer surfaces of
same, and that various changes in the shape, size
the outer glass sheets ?ush with one another.
After the units have been properly associated 20 and arrangement of parts may be resorted to
with one another, the overlapping attaching
without departing from the spirit of the inven
?anges A are secured together by the glazing bar
tion or the scope of the subjoined claims.
or post [3. This bar comprises outer and inner
I claim:
clamping strips 24 and 25 positioned at opposite
1. A laminated glass glazing unit, comprising
sides of the attaching ?anges and secured to 25 two sheets of glass and an interposed layer of
thermoplastic bonded thereto to form a composite
gether. by bolts or other suitable fastening ele
ments 26 which pass through the said ?anges.
structure, said plastic interlayer being of greater
The clamping strips 24 and 25 are received be
area than either of the glass sheets and extend
ing outwardly therebeyond to provide a ?exible
desired, a layer of plastic material 2'! may be dis 30 attaching ?ange that is of lesser thickness than
posed between the outer clamping strip 24 and
and offset from the center of the main body of
the glazing units. A similar layer of plastic 28
the plastic interlayer lying between the two glass
may be disposed between the inner clamping strip
sheets, and a metal reinforcing member carried
25 and glazing units. As illustrated in Fig. 2, the
by the said attaching ?ange, one of said glass
outer clamping strip 24 is arranged ?ush with 35 sheets extending outwardly beyond the edge of
tween the glass sheets of adjacent units and, if
the other glass sheet and terminating inwardly
the outer surfaces of the outer glass sheets of
adjacent units, and this is of especial advantage
in glazing airplanes and other aircraft as it gives
of the outer edge of the said offset attaching
?ange and cooperating with the attaching ?ange
a smooth, unbroken surface and serves to de
crease wind resistance.
With such an arrangement, it will be seen that
the two glazing units [0 and II are ?rmly yet
pair of transparent panels mounted in edge to
edge relation, each panel comprising outer and
inner glass sheets and an interposed layer of
thermoplastic adherent thereto, a portion of the
plastic interlayer of each panel extending beyond
yieldably secured to one another in such a man
ner that they will be permitted to move relative
to one another upon being subjected to strain
and stresses, as well as diiferences in pressure,
without breaking the connection therebetween.
It is also preferred that the plastic interlayer of
each unit In and ll be extended beyond the other
edges of the glass sheets and the extended por
tion only secured in the supporting frame [2 by
to provide a slot therebetween.
2. In a windshield or window construction, a
one edge of the glass sheets to provide a ?exible
attaching ?ange, the thickness of said attaching
?ange being approximately one-half the thick
ness of the plastic interlayer and positioned im
mediately adjacent one of the glass sheets, the
attaching ?anges of the two panels overlapping
means of screws or the like 29 passing there
one another to bring the outer glass sheets in
through. This will give to the mounting a certain
alignment, the inner glass sheets of the abutting
panels extending outwardly beyond the edges of
?exibility or resiliency so that any twisting or
weaving of the plane will be taken up by the ex
tended metal-plastic instead of being transmitted
directly to the glass. Although it is preferred to
provide the metal reinforcing members 23 for the
extended portions of the plastic interlayers, the
use of such metal reinforcement is not essential
in all cases.
In Fig. 4 is illustrated a windshield or window
construction similar to that described above, with
the exception that the inner glass sheets of the
two glazing units l0 and II extend beyond the
' edges of the outer sheets as indicated at B to pro
vide a so-called stepped arrangement. This also
results in the outer clamping strip 30 of glazing
the outer glass sheets to form a slot between one
of said inner glass sheets and its offset interlayer
within which the offset interlayer of the other
panel is received, means for securing the over
lapping attaching ?anges together comprising
clamping strips disposed at opposite sides there
of and fastening means passing through the said
clamping strips and attaching ?anges, the outer
clamping strip being received between the edges
of the outer glass sheets and lying with the‘ outer
surface ?ush with the outer surface of the glass
sheets, and the inner clamping strip being re
ceived between the edges of the inner glass sheets,
and a metal reinforcing member embedded in
bar [3 being relatively wider than the inner ' each attaching ?ange and projecting inwardly of
clamping strip 3|. By making the inner glass 70 the edges of the respective glass sheets.
sheets larger than the outer glass sheets so that
the inner sheets overlap the outer clamping strip
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