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Патент USA US2064530

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Dec. 15, 1936.
Filedl March 21, 1934
Patented Dec. l5, 1936 »
2,064,530 l
Frederick Gelstharp and Joseph Carl Parkinson,
Tarentum, Pa., assignors to Pittsburgh Plate
Glass Company, a corporation of Pennsylvania
Application March 21, 1934, Serial No. 716,636
2 Claims.
(Cl. 2li-56.5)
' The invention relates to a double glazed window
curely held in position and'act as an anchoring
construction for use in buildings and refrigerator means for the member 3. In order to prevent
c'ase structures. It has for its principal objects, -condensation, and eñlorescence upon the inner
(l) the provision of improved means for hermeti
faces of the glass sheets, the space between the
5 cally sealing off the space between the glass sheets two sheets is supplied with dry air when the con- 5
from the outer atmosphere; (2) the provision of struction is installed. This may be done -by any
a construction applicable to ordinary wood sash ,suitable means whereby dry air is forced through
which permits the Vready removal of the sheets one of the tubes I0, and is evacuated through the
for cleaning or replacement; and <3) the pro
other tubes until the air which fills the space
10 vision of a construction having improved means
between the glass sheets is completely dry. The .10l
permitting the filling of the space between the
glass sheets with dry air in order to _avoid con
densation and prevent or limit the formation of
an alkaline clouding film on the vinner surfaces
15 of the sheets. Certain embodiments of the in
` vention are illustratedin the accompanying draw
ing, wherein:
Figure 1 is a front elevation of the construc
tion. Fig. 2 is a section on the line II-II of
Fig. 3 .is a detail perspective view >of the
sealing member. Fig. 4 is a detail view partially
in section of 'the sealing member. And Figs. 5
and 6 are sectional views illustrating modifica
Referring to the construction of Figs. 1 to 4,
lis a sash which is in this instance of wood;
2, 2 are sheets of glass; 3 is a packing or sealing
member placed between the glass sheets; and> il is
a clamping plate which engages the outer face
' 30 of one of the glass sheets, such plate being held
in place by the screws 5 and being of wood in
-the present instance. The sash l is provided
with a Seating abutment or shoulder 6 whose
outer portions act as seating ledges for the edges>
35 of the glass sheets and is also provided with a
shoulder 'l in opposition to the outer face of one
of the glass sheets 2.
The sealing member is preferably in the form
outer ends of .the tubes are then sealed by means .
of the screws Il, li which are threaded into Ithe
Fig. 5 illustrates a modification in which the
sash i2 is of metal instead of wood and in which 15
two clamping plates i3', I3 are employed, such
plates being held in place by means of the ma
chine screws I4. In this instance, the trans
parent plates l5, l5 are of safety glass; that is,
each plate consists of a pair `of sheets of thin 2U
plate glass with an interposed sheet of reinforc
ing vmaterial to which the glass sheets are ce
mented. In this construction,«the sealing mem
ber I6 is integral with the sash instead of being
separate therefrom and is provided on its sides 25
with sealing strips of rubber, similar to the strips
8 and 9 heretofore described.
Fig. 6 illustrates another modification in which
the sash I'l is of metal and the glass sheets I8,
I8 are held in position by means of the single
metal plate i9 secured by the screws 20. In this
case, the sealing member 2l is of the same con
struction as in Figs. 1 to 4.
When safety glass is used in the construction,
as shown in Fig. 5, it is highly desirable that 35
a special form of such glass be used, in order that
the transparency of the window shall be un
impaired after a long period of service. The
of an integral rectangular frame of metal which ,cellulose plastic reinforcing between the sheets
40 ñts vsnugly into the sash andis provided on `‘its tends to become yellow and brittle in the course 40
opposite faces with the rubber sealing strips 3 and ' of time, due to the decomposing action of ultra- l
violet light, and in order to counteract this tend
3. `When the parts are positioned, as indicated ency, the outer glass sheet of each pane is made
in Figs. 1 and 2, and the‘plate 4 is clamped in with a small content of an oxide, such as iron
'9 which are preferably cemented to the member
_position by means of the‘screws 5, the rubber
strips 8 and 9 are placed under compression so
v that they are thinned and widened, as indicated
_in Fig. "2, and form a very secure seal/for the
’ space between the two glass sheets.
oxide, which acts as an ultraviolet ray cut-01T 45
medium. An amount of from .35 to 1.00 per
cent of iron oxide serves to cut 01T the major
portion of the damaging ultraviolet rays, and
at the same time, adds only a slight tinge of
color to the glass. The inner sheet of each >50
vIn order to provide for the application of dry
air to the space between the sheets 2, 2, the tubes l pane of glass is »also vpreferably` made from a
I0, l0 are provided, such tubes extending through special batch in order to avoid the phenomenon
the sash and through the member 3, as indicated known as “eñ‘lorescence”. 'I'his is a deposit of
in Figs.j2 and 4, the inner ends ofthe tubes being white alkaline dust which occurs upon glass and
55 screwed into the member 3 so that they are se
becomes noticeable in a double glazed structure 55
_because the inner surfaces of the glass sheets are
not accessible for wiping. With dry air in the
insulating space, this deposit'is reduced to a
minimum, but in order to further guard against
this defect, the inner sheets of glass are made
from a batch containing from 2 to 10 percent
of potassium oxide. This has been found to
reduce eñ‘lorescence to a negligible amount. The
window, as thus constructed, therefore main
tains its original appearance through a period
of service in .which a window employing ordinary
safety glass would become so discolored and
clouded as to require replacement. Oxides other
than iron oxide may be used in the glass as ultra
15 violet cut-off ingredients, such as cerium, tita
nium, nickel, and chromium, and both the inner
and outer sheets may have a content of both iron
oxide or its equivalent, and potassium oxide, but
this involves much greater cost with no added
What we claim is z’
1. In combination with a sash having seating
shoulders on the sash projecting inward past the
seating ledges and engaging the outer faces of
the glass sheets, one of which is removable and
provided with clamping screws, a removable seal
ing strip of hard material lying in opposition to
the shoulders between the glass sheets having
yielding packing material along its side edges
engaging -the inner faces of the glass sheets,
means for supplying dry air between the glass
sheets and for anchoring the sealing strip in 10
position comprising metal tubes extending
through the sash and sealing strip, and threaded
into the strip at their inner ends, and closure
means for the tubes.
2. A non-condensing glazing panel comprising 15
va spacer frame composed of rails of relatively
non~compressib1e material secured rigidly to
gether at their junctures, strips of flexible elastic
material carried by and extending from the lat
eral faces of said rails, plates of glass sealed to 20
said respective strips of elastic material, and
an anhydrous fluid provided between said plates
ledges for the glass sheets with surfaces for en- ‘ of glass.
gaging the edges of the sheets extending at
25 right angles to the plane of such sheets, a pair
of parallel glass sheets in the 'sash„ a pair of
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