US2219688A - Multiglazing - Google Patents

Description

50 air to the building.

vPatented Oct. 29, 1940 2,219,688 MULTIGLAZING Percy E. Knudsen. Pittsburgh, Pa., assignor to Pittsburgh Plate Glass Company, Allegheny County, Pa.,

a corporation of Pennsylvania Application January, 1939, Serial No. 252,916

Claims- The present invention relates to window construction involving a plurality of spaced sheets or panes of glass and it has particular relation to a construction in which one of the sheets or panes 5 is removable to admit of cleaning or othermanipulations of the glass. a

One object of the invention is to provide a multiple glazed window construction which is simple and which admits of removal of one pane to give access to the interior of the construction without disturbing the second pane.

A second object of the invention is to provide a window construction in which there are no metallic parts having exposed surfaces both within and without the building in which the construction is employed.

In order to reduce heat transmission, it has been proposed to employ a plurality of spaced sheets of glass mounted in a frame in such man- 26 ner as to provide an insulative dead air space or chamber. Transmission of heat through the windows is thus greatly reduced. However, in such construction difficulty has been encountered in the provision of an adequate seal about the edges of the glass to exclude moisture from the inner space. Such moisture tended during cold weather to condense and sometimes even left a :permanent film upon the glass. It also tended superficially to attack the glass to produce a haze or bloom which could not conveniently be removed.

.Another development of modern window constructions has involved the provision of metallic sashes, frames and other structural elements. 35 Difliculty has been experienced with them because'of high thermal conductivity. Considerable heat was transferred through them and at the same time objectionable moisture was precipitated upon them.

The present invention involves as one feature the provisionof a window construction including inner and outer panes or plates of glass, the latter of which is clamped independently of the former, and the inner sheet is so secured as to admit of 45 easy removal.

In such construction it is a simple matter to take out the removable inner glass and clean the affected surfaces without disturbing the outer glass, and thus affording access of the external As a further feature, the invention involves the provision of a window construction in which all parts that constitute good conductors of heat are interrupted within the construction, thus chas visitin cold surfaces that would constitute points drawing in which- Figure 1 is a fragmentary elevational view of a window constructed in accordance with the provisions of the invention.

Figure 2 is a fragmentary cross-sectional view taken substantially upon the ure 1.

line 11-11 of Fig- 10 In the drawing like numerals refer to like parts throughout. As shown,

a wall l 0 defines an opening in which is disposed a window construction il, having a 15 ledge portion l2 and a shoulder l3, the latter of which is crowned about its edge with a layer ll of cement constituting a seat for a metallic (iron) structural bar It. The bar is preferably, ap-

proximately of T and includes outer flanges l1, inn and a connecting web- IS. The lower edge or flange I1 is spaced slightly from the shoulder l3 and the space is packed with a suitable caulking material 20, e. g. with asphalt or like bituminous 25 material mixed with a filler such as whiting.

A wooden insulative bar 22 is disposed between flanges l1 and I8 with the upper surface thereof terminating below the upper edge of the former flange. The bar is, also, grooved to receive the upper portion of the second-mentioned flange and is secured in position by means of screws 24 extending through the flange l1 and terminating within the wood. The exposed lower portion of flange I8 is covered by an insulative layer 2| of plaster or other material.-

-like cross-sectional contour, 20

er flanges l8,

Spaced sheets of glass 26 and 21 having an adhesive sealing tape or compound 28 about-the eedges thereof are disposed upon the bar 22, with the edges of the outer sheet (26) engaging the abutment provided by the inner face of the projecting edge of flange II. A spacer bar 29 of wood or other suitable insulative material is disposed between the sheets or plates of glass and constitutesa clamp for plate 26. It is held in position bymeans of bolts 3|, which include heads 32 disposed in suitable sockets in the lower face of bar 22 and stem portions 33 extending upwardly through openings 34 in bar 22.

The opening 36 in spacer bar 29 is offset slightly inwardly with respect to the stem 33 and preferably is downwardly tapered. Head 31 of the bolt is downwardly tapered in such in the nut is screwed into position,

anner that as the bar 36 is forced slightly outwardly in order firmly to grip the edge portions of the sheet or pane 29.

The inner sheet of glass is releasably maintained in position by means of a finish strip 38, approximately of inverted L -shaped cross-sectional outline and including a vertical branch 39, horizontal flange 4| and a downwardly-directed lip 42, the latter of which engages the margin of the glass 21. Member 28 is held in position upon the bar 22 and actuated toward the glass 21 by means of screws 43 which are threaded through the leg or branch 39 into suitable bushings 44 disposed in openings in bar 22. It will be manifest that the inner sheet of glass 21 may be replaced by two or more spaced sheets or plates secured together by metallic marginal channels or like means to provide a unit that can be installed in the same manner as a single late. p The mode of operation of the invention is practically self-evident from the foregoing description. It will be assumed that the metal bar I6 is disposed in position in the opening in the wall l0 and that the bar 22 is secured thereupon by means of screws 24. Sheet or plate 26 is then pressed into position against the flange l1 and is secured from displacement by means of bar 29. Plate or sheet 21 is then slid into the opening with the margins thereof engaging the inner face of said bar. Subsequently the finish strips 38 are mounted in position with the lip 42 engaging the glass and the 'screws 43 are driven home in order to exert firm pressure against the edges.

An important advantage of the construction resides in the fact that frame elements l6 can be directly mounted in the window opening during or after the erection of the building walls. Subsequently the bars 22 can be disposed. in position thereupon. Both sheet 29 and bar 29 can 1 then be mounted from the interior of the building. This constitutes a substantial advantage where the sheets are large and at considerable height above the ground.

It will be observed that in the foregoing con-.-

45 struction. there are no metal parts extending from the exterior of the wall to the interior thereof.

This is an advantage because metal parts constitutes excellent conductors of heat and therefore in cold weather the inner faces of metal parts when exposed become chilled and are subject to condensation of moisture. Such moisture of course causes rust of the parts, andvit isunsightly and is otherwise objectionable. It will also be noted that the outer sheet or pane 26 is clamped by bar 29 independently of pane 21 in such manner that the latter can be removed by simple release of finish strip 38 in order to admit of cleaning of the interior surfaces.

The form of invention herein shown and described constitutes a preferred form. However,

it is given primarily for purposes of illustration, and it will be apparent that numerous modifications may be made therein without departure from the spirit of the invention or the scope ofthe appended claims.

What I claim is:

l. A building construction embodying a wall having a window opening formed therein, metallic members providing a channel upon the marginal portions of the opening, said channel having a wide outer flange and a narrow inner flange, both flanges being vertically disposed, the

outer of the flanges projecting upwardly to provide an abutment for the margins of the outer sheet of glass, a bar of insulative material formed to flll the space between the flanges and being provided with a portion fitting over the inner flange, an outer sheet of glass having marginal portions disposed upon the bar and abutting against the upwardly-projecting margin of the outer flange, an inner sheet of glass disposed upon the bar, a spacing member'disposed between the two sheets, a clamping plate of approxi- .glass to clamp the latter in position independently of the inner sheet of glass.

3. A construction as defined in claim 1 in which the spacing bar is provided with means actuating it outwardly toward the first-mentioned sheet of glass to clamp the latter in position independently of the inner sheet of glass, said means comprising screws disposed in openings formed in the spacing bar in eccentric relation with re spect to the screw and a nut having a tapered head screwed upon the bolt.,

4. A window construction comprising an outer frame provided witlf a flange projecting inwardly, a sheet of glass engaging at its margin with the flange, gripping means positively securedto the frame'and maintaining the glass in position, a second sheet of glass secured in the frame in spaced relation to the first. to provide a dead the conically tapered opening and a nut having a downwardly tapered head upon the screw.

5. A window construction comprising an outer frame provided with a vertically disposed flange. a sheet of glass in the frame and engaging the flange and an approximately rectangular spacing bar directly secured to the frame, means for moving the bar upon the frame to press the glass into position against the frame, said means being operable to increase or reduce the pressure of the bar against the glass without releasing the latter, a second sheet of glass disposed in the frame and engaging the bar upon the side opposite to the first-mentioned glass and means se cured to the frame and actuating the secondmentioned sheet of glass against said bar, both of said means being operable independently of each other.

PERCY E. KNUDSEN.

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