US2308918A - Double window - Google Patents

Description

Jan. 19, 1943. H. HERTEL ET A1,. 2,308,918

DOUBLE WINDOW Filed neo. 5, 1940 /I /f I f ,//f i\\grl///////////////////// Patented Jan. 19, 1943 DOUBLE WINDOW Heinrich Hertel and Justus Muttray, Dessau, Germany; vested in the Alien Prope'` ty Custodian Application December 5, 1940, Serial No. 368,558 In Germany September 28, 1939 1 Claim.

This invention relates to improvements in double windows, and refers particularly to a double window construction intended for use on airplanes and especially on those intended .to fly at high altitudes.

Vehicles have already been equipped with double windows having a gas tight space enclosed between them which could be heated. Dry gas was injected and heated therein to prevent condensation on the panes. Such windows, however, when applied ,to airplanes are open to the objection that it is necessary to employ very thick glass because of the differences between the air pressures exerted upon the panes and the pressure of the gas exerted upon the latter, .thereby materially increasing the weight oi the windows. Spacing members have also been employed to reinforce the panes and permit the use of thinner glass but such an arrangement produces interrupted vision, and the spacing members are difficult to fasten satisfactorily.

Double windows 'have also been utilized Where the 'panes were subjected to only slight differences in air pressure and were made of special thin glass of high tensile strength and high elasticity to withstand such slight differences; but

when such windows are employed in airplanes flying at high altitudes so much deformation occurs, due to variation in air pressures, that vision is so distorted as to render it unsafe to use them for cockpits. Double windows having a gas tight seal between the panes and means for substantially equali'zing the pressure of the gas and that of the air exerted on both panes, which in that instance is the same, have been employed on ground vehicles.

This invention aims to provide a double window which is light in lweight, and which adords good insulation and unhindered vision without distortion.

Another object of the invention is to provide' a double window consisting of a thicker outer pane to resist stresses caused by differences in air pressure inside and out, and a thinner inner pane yieldingly mounted relative to .the outer pane whereby the pressure of gas sealed in the chamber between the panes is automatically equalized with the air pressure exerted against the oppo site side o! the inner pane.

A further object of .the invention is to provide a double window having an outer pane thick enough to protect the inner pane from all stresses resulting from differences in air pressure, thereby permitting the use of a very thin inner pane which requires no reinforcement which would v around the outer pane so that gas tight seal is positively maintained at all times between the panes.

Having thus enumerated some of the major objects and advantages of the invention we will now proceed to describe a preferred embodiment of the double window'with the aid of the drawing wherein a sectional view thereof is shown.

Referring to the drawing, I designates an outer frame having a relatively .thin inwardly directed ange 5 formed substantially flush with its outer face, and secured to the inner face of the said outer frame is an .inner frame 6 all the sides of which project inwardly beyond the sides of the outer frame 5. Mounted in the latter .is a thick outer plane having an annular recess la formed around its outer edge to receive the annular flange 5 so that the outer faces of the frame 4, the flange 5 and the pane i are all substantially in alignment. The inner side of the outer pane I is marginally supported by the inner frame 6.

One extremity of an annular bellows-like resilient mounting. I6 is held between the nange 5 and the recessed portion la. of the outer pane. This mounting is flexed and. supported both between the peripheral margin of the pane l and .the adjacent portion of the frame 4, and between the inner face of the said outer pane and the adjacent face of the inner framed The rearwardly intermediate portion of the mounting I8 is folded outwardly towards the wall of the opening through the inner frame 8 and ter minates in an inwardly folded extremity to which an inner pane, which is relatively quite thin, is marginally secured to form a gas tight chamber I between the panes l and 2.

From the foregoing it will be readily seen that due to the resilience oi the bellows-like mounting IB the pane 2 is automatically moved to equalize the gas pressure within the chamber 3 with the air pressure acting upon the inner face of .the inner pane 2, thereby increasing or decreasing the volume of the said chamber. Again due to the mounting of the outer pane I in the folded outer portion of the mounting I8 so that a joint is made between the latter and the inner face of the outer pane the folded intermediate portion of the mounting is in no way dependent upon the wall opening of the inner frame to Seal the chamber and may be or such size as to be clear of .the said wall at ail positions of the inner pane 2,

While in the oregoing the preferred arrangement of the invention has been described and shown, it is understood that the construction is susceptible to such alterations and modifications as fall within the scope of the appended claim.

What we claim is:

A double window construction comprising an outer frame having a ledge along one side ot its inner periphery, an inner frame in juxtaposition with said outer frame and forming with said other margin of said resilient mounting 'being secured to the outer tace or the inner pane.

HEINRICH HERTEL. JUSTUS MU'I'IRAY.

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