US2262670A - Storm sash - Google Patents

Description

Nov. 11, 1941. A. A. ENSMINGER STORM SASH Filed Aug. 4, 1958 I5 Sheets-Sheet l flyer .m *n Y mf -Y NA m Z wr M w t 3 r l H Nov. 11, 1941. A. A. ENSMINGER STORM SASH 3 Sheets-Sheet 2 Filed Aug. 4, 1938 INVENTOR th rf?. E .5min er' gr u n g AT'TORNEY Nov. 11, 1941. A. A. ENsMlNGER 2,262,570

STORM SASH Filed Aug. 4, 1958 5 Sheets-Sheet 3 F1'. ,E3 .7 ATTORNEY Patented Nov. 1l, 1941l UNITED STATES PATENT AOFFICE:

I sr'ggsn I 'Applicluoll'Alll'lllt 4, 1938, Smil N0. 223,088

(ci. 18s- 64) 13 Claims.

This invention relates to combination storm and screen sashes and more particularly to an adjustable all-year sash with seasonably interchangeable panels.

An object of the present invention is to imf I dated September 10, 1935.

Another object is to provide a sash that is adapted for fitting snugly into building apertures that are not of accurate dimensions and that have become slightly deformed or out of true from the settling of the building and the weathering, warping, and the like, of the wood of which the aperture casing is made.

-A further object is to provide an adjustable seal that makes slidingy engagement with the frame oi an article in an aperture and that may be drawn tightly against both the aperture casing and the frame of the article that is mounted in the aperture casing to form a wind arresting storm seal with both.

Another object is to provide a sash frame that contains a thermally insulating normally dead air space substantially throughout its length.

Another object is to provide a storm sash installation for windows and the like that minimizes the decay of the window sill by minimizing the retention of water therebetween and the development of condensation on the inner side.

Another object is to provide a glass panel wherein the glass is protected'from strain, and where preferred, a panel wherein the glass may be simply and easily replaced when broken.

A further object is to provide a glass panel deflector packing that defiects the water and the rubber blade of a window cleaning tool past the junction of the glass with the packing, and that may protectingly cover adjoining parts where desired.

A further object is to provide an `improved panel keeper that may bothvlift and fasten a sash in the frame.

Another object is to provide a seal that is adjustable on an article frame bothtoward and away from the article and, if desiredI longi- 4 tudinally o! "the seal.

Another object is to provide a simplyconstructed screen frame that has butt welded corners.

Other objects are to provide a sash assembly that embodies various renements and modiilcations that have beenfound by experience to be of practical advantage in both manufacturing and to the trade.

' wherein:

With the above and other objectsl in view' that will. be apparent to those who are familiar with the art to which the present invention pertains, illustrative embodiments of the invention are disclosed in the accompanying drawings,

Fig. 1 is an elevation from indoors of a combination storm and screen sash mounted in a building aperture: e

Fig. 2 is an enlarged fragmentary section taken along the line 2-2 of Fig. 1;

Fig. 3 is an elevation from outdoors of the broken away lower part of the sashV that is shown in Fig. 1; r

Fig. 4 is an enlargedelevationot abroken away comer oi the sash trame with its adjustable sliding seal shown against the sash frame in full lines and adjusted awayfrom the sash trame to completely ll the building aperture in which the sash is mounted in dot and dash lines:

Fig. 5 is an enlarged sectionof Vthe side frame, slidingseal, panel and keeper, taken along the' line 5,-! of Fig. 1;

Fig. 6 is an enlarged view that is partly broken gays, of the panel keeper that is shown in Fig. 7 is an enlarged elevation of the keeper engaging portionof the sash frame;

Fig. 8 is an enlarged fragmentary view o! a glass panel of the type that has a screw securing removable portion in its frame for glass re'- placement;

. Fig. 9 is a section taken along the line 9--9 or Fig. s;

Fig. 10 is an enlarged view oi' a corner of a removable screen panel; v

Fig. 11 is a screen panel section taken along 'the line |I`|l oi! Fig. 10; 1

Fig. 12 is a section of a modied screenf panel that has an enclosing surfaced frame;

Fig. 13 is a section of a sash side portion of lthe frame, sliding seal, and panel assembly that shows a glass panel that has a deilector yframe construction;

Fig. 14 is a section of an `installed sash i side member that is secured together along its panel supporting flange;

Fig. 15 is a multiple sectionedaxially telescoping sash frame seal that permits a limited elongation or shortening adjustment as well as a lateral adjustment of the 4seal on the sash frame;

Fig. 16 is a section of an extended water deecting lower edge of a glass panel, as applied bar of the sashfram Fig. "-`i's"a plan view' of a glass panel that may be removably installed in a sash frame;

K taken n l)along the 'line Fig. 21 is an enlarged section of the bottorli"v cross bar of the sash frame,A taken line 2I-2l of Fig. 17; Fig. 22 is an enlarged secti'onkif one of the along thethat is'shown in Fig. 15 may be used. In this structure the inner telescoping seal 85 slides longitudinally into the outer telescoping seal 86. The division is preferably substantially midway between the ends of theassembled seal.

n 'I'he sliding seal members are secured in the building aperture at -desired locations by suitable means, such as by ,the.,screws I4 that enter vthe building aperture blind stop vI5 'and that draw the sashframe contacting-preferably inclined, free edges I6 of the seal members'into close clamping engagement with the contacted 1 parts V of the sash frame. The sash frame screw sash frame side bars and panel keeper, taken along the `line 22-22 of Fig. 17;

Fig. 23 is a view, partly in section, of the panel I keeper that is shown in Fig. 22A;

Fig. 24 is an enlarged section of the middle bar 'of the -sash'frama takenialong the line 24-24v holes, rit will be noted, are preferably, altho not necessarily, offset slightly with respect .to each other so that vthe screws I4 have sulllcient slant to draw the seal tightly against the casing of the building aperture.'`-"Where the mold strip struc- Fig. 25-is an enlargedsection'oi a modified' middle bar fora'sash frame;`- f w Fig. 26 is fan enlargedv broken away outdoor elevation of an upper corner of the sash frame that is shown in Fig. 1'7; and

Fig. 27 is an enlarged broken away outdoorz elevation of a lower corner of'thesash frame that is showninFig. 17.v

The combination storml and screen sash as-` sembly that embodies anl illustrative part of the presentinvention, comprises a sash frame that is 'made up of a pair of hollow side members I,

l 'a top cross bar'l2, a middle cross bar 3, and a bottom cross lbar 4, `that are -secured together at 'their junctions in any appropriate manner; as byfwelding, rivets, or the like.

The individual sash frame members, including i the cross bar portions, l are preferably hollow and are made of shapedVsuitable sheet material that may have its edges secured together in any desired manner, as by-welding or, the like, and that may have a weld strip .portion v5 forming a part thereof, if desired. Where the Aweld strip structure is adopted, the weld strip may occupy an edge.- or it may be disposed between the edges, as shown in Fig. 13, or it may occupy if weldedv together at all, may be welded along` its'panel receiving outdoor flange 1.

4The sash frame is mounted lin a building apertureA with preferably a sliding seal in adjustably secured contact with the sash frame.

Inthe .structure shown, a pair of seal side` 3 members 8 `closely abut the building aperture side casings 9the sliding seal ,topv member Illl abutsv the head casing II, and the sliding seal bottom memberpIZ rests ony thesill I3. Each of these sliding sealtmembers may be adjusted toward or away from apart of the sash frame, as

` shown in dot and dash lines 8a in Fig. 4, or lon' gitudinall thereof, soythaty n -o objectionable crack vappears between the' 'scala/nd the'buildin'g aperturecasing.

The sliding seal shown in Fig. 5; is of substanwalls extending -ifrom a base portion. -Where desired-,f the modiiidztelescoping. seal member- `tially channel shape, with a plurality of side 5 ture isused, the weld strip 5 is cut away. as at I1, to provide ample clearance for the proper positioning of the screws.

The bottom seal member I2 has a desired number of drainage and breather apertures I8.` in the indoor side thereof for permitting a limited air circulation through the sash. It also .has a fluid drainage aperturev I9 that is'oiset andfnot in alignment with theapertures I8 and which permits the escape of any wind-borne water or thelike that is carried intothe interior chamber of the hollow frame bottom bar 4 through the `ventilation .louvers 20 that are disposed in the outdoor side of the bottom -bar 4,

and that ilows into the seal ybottom' member through the drain aperture 2| in the sashframe bottom bar 4.

Ample areas of f and the sill I3 arek preferably exposed to the dryling action of air tominimize the retention .of

water therebetween. This end is accomplished in the disclosed structure by the edge 1engagement of the lower; face of the seal bottom member I2 with the inclined sill I3, ,l

The screws I4 are preferably drawn suiliciently tight so that the side members of the seal substantially support the bulk 4of the weight of the sash assembly to provide substantially a iioating sash and to minimize the settling of the sash assembly on the building aperture sill. The weld strip 5 on the sash frame bottom bar 4 may, if desired, be disposed on the-indoor side of the lower face of the frame bottom bar to shorten the moment arm in the force distribution of the weight from the sash assembly through the seal bottom member I2 to the sill I3.

Suitable means is provided for permitting the passage `of air through the sash on pleasant winter days, such as the shutter 22 that is provided with the hand grip 23 and that is'opened in any desired manner, as byl causing its rotation 4on the pin 24. The stop 25, or the like, arrests the shutter 22 in its closed position.l

, Thezbottom cross bar 4 receives a panel frame, such as the frame 26 'of the glass panel that is shown in the lower panel aperture, in a suitable upwardly opening channelysuch as that formed by the outdoor panel receiving-flange 21 and the indoor flange 28 that may be inclined or-not, as'

preferred and the cross brace 21a that forms the base of the channel. YSuitable sash frame packing 29 may be interposed between the panel frame and a part of the panel receiving channel, if dea sired.

l'Ihe' middle cross bar 3 of the rsash frame'has a downwardly openingchannel of` ample depth to permit the easy clearing of the bottom bar indoor,-

the seal bottom member l2v flange 23 on the introduction of the panel into the lower panel aperture. as by positioning the brace member 40 above the middle of the cross bar, or by similar provision.

The middle cross bar lower ange portion of the indoor strip 3| is preferably, vtho not necessarily, of sullicient length to support a panel in the lower-panel aperture when the lower bar of the lpanel frame is seated in the upwardly opening channel of the bottom cross bar.

The middle cross bar has an upwardly opening panel frame receiving channel of which the brace 3D, or similar panel supporting means, forms the base or bottom and the upper flange portions of the indoor strip 3| and of the outdoor portion of the middle cross barv 3 forms the sides.

The top cross bar 2 oi' the sash frame opens downwardly in a panel frame receiving channel of ample depth so that the bottom bar portion of the panel frame may clear the upper ilange edge of the middle bar inside strip 3|. l The top cross bar brace 32 imparts strength and firmness to the top bar by being positioned preferably rather low in the top bar and by be ing secured, as by a weld, or the like, to both the outdoor part of the top bar and to the indoor portion 33.

During the Winter months glass panels are positioned in the panel receiving apertures in the panel frame. The glass panel frame 26 preferably extends along the periphery of the glass 34 to provide a uniform thickness for the edge of the panel and to permit the handling of the panel without danger of hand injury from an exposed glass edge.

A desired packing material 35 may be interposed between the glass and the frame, if preferred, as shown in Fig. 5. The packing material, if soft and resilient, prolongs the life of the glass by its absorption of shocks or torque to which the panel frame may be subjected.

The packing 35 is shown in Figs. 13 and 16, as having the deflector portion 36 that extends along the glass beyond the frame and that imparts an atractively finished appearance to the panel. The deflector portion 36 simplifies the cleaning of the window panels by deflecting the water and the rubber strips of a window cleaning tool beyond the junction of the glass and the packing without the deposit of objectionable water at the edge of the glass.

The deilector portion 36 may also protectively overlie the edge of the glass panel frame and, if desired, extend continuously beyond the sash frame packing 29 andthe edge of a sash frame panel receiving channel, as the -strip 31 that is shown in Fig. 16, to protectively deflect the flow of water thereacross, where the packing 35 is of waterproof material, such as rubber or the like.

The glass panel frame 26 is secured together at the corners in any suitable manner, as by having its overlapping parts welded together, as shown in the lower corner of Fig. 8-, where the frame is of metal, or the like.

The glass panel frame may be adapted for the replacement of glass therein, if desired. In the structure that is shown in Fig. 8, one or more sections 38 of the frame, with its packing 35, may

be removably secured to the remainder of the frame by suitable means, such as by the screws 39. A portion of the glassmay be removed to provide clearance for the screw, as where the corner is cut away at 40, or the like.

During the summer months the glass panels are kept in storage and screening panels are in use in the sash.

The screen wire 4| in the screen panel is mounted on thescreen frame in any suitable manner, as by having its edge secured by welding, or otherwise, where the core is of metal or the like, to the screen frame core 42, that may be solid bar stock, as shown, or hollow to decrease the weight of the panel, as preferred.

For the present use it has been found that ample strength is imparted to the corners of the screen panel where the core 42 is abutted and spot welded deeply at the line of abutment, as at 43, on the face and the outer edge of the core 42.

- A finished appearance is imparted to the screen panel frame in any suitable manner, as where sheet material 44 is applied to overlie the contact between the screen wire 4| and the core 42, or where a desired sheet material 45 substantially incloses the frame core 42.

The panels are preferably secured in the panel receiving apertures of the sash frame by suitable means, such as the keepers 46, that are operatively interposed between the panel and the sash frame in any preferred manner.

In the illustrated structure shown, the keeper 46 is rotatably mounted on a panel frame by suitable means, such as by the rivet 4l. The keeper is provided with a suitable hand operating means, such as the ring d8 that is advantageous in that it may be folded back against the sash frame so that it is not objectionably visible from the outdoor side of the sash.

The sash frame engaging end of the keeper contacts the sash frame in any desired manner to firmly secure the panel within the sash frame.

In the structure shown, the sash frame is apertured, as at 49, for the reception of the sash frame engaging endof the keeper. The sash frame aperture may, if desired, terminate on a level with an edge of the keeper, as at 56, so that leverage is available to lift the panel up out of the channel ln which the lower part of its frame' rests, or to press the panel frame down into its channel, as desired.

Where desired, an edge 5| of the aperture in the sash frame may be inclined suiliciently so that, as the sash frame-engaging end of the keeper is operated against it,.the panel frame is pressed toward and is secured closely against the sash frame packing 29.

The modified storm sash and screen assembly that is shown in Figs. 17-2'7 inclusive of the drawings comprises a plurality of sash frame members that are preferably shaped from single strips of material. The sash frame comprises a pair of hollow side members 52 that are provided with outdoor panel supporting flanges 53 against which panels are removably *positioned` The top bar 54 of the sash frame comprises hollow portions above and below a partition element or strengthening brace 55. 'I'he outdoor flange 56 is spaced from the indoor flange 51 suiliciently so that the indoor flange may yieldingly permit the insertion of the frame of a removable panel therebetween.

The bottom cross bar 58 of the sash frame is hollow and terminates upwardly in a panel-re ceiving channel 59. .Provision for permitting ventilation through the bottom ba-r is made by suitable means such as the rain-deileeting and air-admitting, downwardly opening louvers 60 in the outdoor face of the bottom bar, and a shutter 6| that is movable, as by being mounted on the pin 62 or the like, and that is operated by suitable means, such as the handle 63. A rest for in any desired manner, as by being clamped between parts thereof as shown. It may be welded in place or not, as desired, and serves to sub-.. stantially close the junction between the sash frame and the sill I3 on which the sash frame rests. Suitable apertures 88 in the bottom bar permit the draining away of any wind borne water that may enter the bottom cross bar thru the louvers 60.

'Ihe sash frame is adjustably mounted in the building aperture casing in a desired manner, as by being adjustably interposed between the blind stop I5 and -a sealing strip 81 that is secured in place by suitable means, such as the screws 88. The sealing strip 81 is drawn into close pressing engagement against the frame ofthe sash and serves to close against the admission of wind, any crack that may exist between the sash frame and the building aperture side casings 9 or the head casing I I.

elements one of which is inclined at an acutev angle to the plane of the panel, as shown. The downwardlydepending spring flange 1I is disposed on the indoor side of the middle bar and is spaced from the stiif outdoor part of the bar so that the upper edge of the removable panel may be inserted `therebetween. The brace or partition element 12 extends across the middle bar 88 and assists in imparting rigidity lthereto.

A modified middle cross bar 13 is shown in Fig. 25 of the drawings, wherein a double .thickness of metal, as in the middle bar 69, .forms the outdoor side of the bar and extends toward the indoor side thereof to provide the brace portion 1l, from which it divides into the more resilient single thicknesses of metal and provides the upwardly and downwardly extending spring indoor panel gripping flanges 15. The upwardly andthe downwardly opening channels that are so positined yieldingly receive upper and lower panel frames thereinto.

The parts of the sash frame are preferably secured together by suitable overlap structures, such as those that are shown in Figs. 26 and 27 f oi the drawings, and may be welded, riveted,

'aneaevo handle 8| the bottom edge of the sash panel is.

pressed down into thel groove into which it seats. The reverse action is accomplished where the keeper lower edge is level with the lower edge of the aperture 80.

Removable panels are inserted and secured in the sash frame from preferably the inside of the building. The panels may be of sheet metal during such time as the building is unoccupied, glass for winter, and screen for summer.

'Ihe combination of the resiliently yielding top,

bottom and side sealing members 8, I8 and I2 provides a supporting frame that may be used in window openings of considerable variation in size and shape and receive a standard size and shape of window assembly that is secured in place by the yielding pressure of the contacting edge portions of the sealing members. 'I'his edge contact is of sufliciently small varea. to minimize thev heat transfer between the metal surfaces. The yielding contact removes all strain incident to expansion and contraction of the building or of the window parts from one another, so that there is no warping or objectionable strains imposed upon the window assembly. This floating or free moving -action of the window assembly prevents the development of objectionable cracks or openings and maintains adequate seal between the window assembly and the window casing during all weather conditions.

The formation of the dead air spaces or cells, by reason of the hollow sheet metal construction of these parts, and the small area of contact between metal surfaces, minimizes the transfer of heat through the assembled unit. The dead air spacesor cells are so divided bythe structural formation of the metal part's that there is a minimum circulation of airv within the structure and a minimum replacement of the air conflned within the structure.

The dead air space or air cell formed bythe sealing members 8, I0 and I2 overlap the dead air space or cell formed within the window frame,

' the only contactV between the metal in the side tively enclosed in a frame of suitable material,

such as the metal 11 that may be replaced where desired, by rubber, a plastic, a fabric or the like, to minimize the breaking of the glass and to prevent cuts and injuries to the hands of anyone handling the panels, and also to insure a panel edge of uniform thickness thruout its length.

Suitable means may be used, if preferred, for

rigidly securing the panels in the sash frame.

'I'he form of securing device that is shown in the Figs. 22 and 23, comprises a J-shaped keeper 18 that is made of metal or the like, and that is movably mounted on the panel frame 11 by suitable means, such as the rivet 19. The tip of the longer arm of the keeper 18 enters an aperture 88 in the side sash frame 52 to lock the panel in position. The aperture 88 in the side sash frame wall of the sealing members and the window frame being at the inner edge portions of thesealing -members that engage the side wall of the sash frame. l

For the purpose of further minimizing the transfer of heat and providing additional heat insulating properties to the structure, the metal parts are given an internal and external surface finish of a'bright reflecting metallic paint or coating, such as aluminum paint, chrome plating or other radiant heat reflecting material.

It is to be understood that the particular constructions of sash frame members, seals `and panels that are shown and described herein are presented for the purposes of illustration and explanation and that various modifications in the particular shapes, constructions and applications I may be made without departing from the invention as defined by the appended claims.

What I claim is:

l. A storm sash for mounting in a window aperture of a building comprising, a metallic panel receiving frame having rigidly connected side and transverse bars, side and transverse sealing members mounted on side and transverse bars of said frame for sealing the spaces between edges of the said panel receiving frame and the walls of a building aperture, each sealing member extending substantially the full length of the frame bar upon which it is mounted and being slidably mounted upon its frame bar for sidewise bodily movement and for tilting movements in the plane of said frame, each sealing member being adjustable independently of the others, whereby said sealing members are adapted to seat upon side and transverse walls of building apertures which vary in spacing and angularity, and means for securing said sealing members to the Walls of the building aperture and for securing said panel receiving frame in iixed position with respect to the sealing members.

2. A storm sash for mounting in a window aperture of a building comprising, a metallic panel receiving frame having rigidly connected side and transverse bars, side and transverse sealing members mounted on side and transverse bars oi said frame for sealing the spaces between edges of the said panel receiving f a e and the walls of a building aperture, each aling member being in the form of a channel bar andv extending the full length of the frame bar'orvwhich it is mounted and having inwardly extending iianges slidably engaging opposite side faces of the frame bar, the side and transverse sealing members having slidably interiitting end portions and each sealing member being movable independently of the others in the plane of the panel receiving frame to seat upon side and transverse walls of a building aperture, and means for securing said sealing members to the Walls of the building aperture and for clamping said panel receiving frame between the iianges of the sealing members.

3. A storm sash for mounting in a window aperture of a building comprising, a panel receiving frame having rigidly connected side and transverse hollow metal bars provided with dat inner and outer side faces, side and transverse sealing members mounted on side and transverse bars of said frame, each sealing member being formed of sheet metal and of channel shape, having a base portion adapted to engage a wall of a building aperture and resilient iianges having inturned edge portions slidably engaging the inner and outer flat faces of the frame bars, each sealing member extending the full length of the frame bar upon which it is mounted, one sealing member slidably receiving the end of another at corners of the frame, whereby the sealing members are independently adjustable sidewise and angularly in the plane of the panel receiving frame to seat upon the Walls of a building aperture, and means for holding said sealing members in place against the Walls of the window aperture and for rapplying a clamping pressure to the flanges of the sealing members to hold the panel receiving frame in xed position with respect to the sealing members.

4. An auxiliary window for use with a permanent one, including an outer member attachable to the permanent window, said outer member being composed of sides and ends each of channel formation having their channels facing inwardly, the sides and ends being free of connection with each other to provide for adjustability in attachment and for expansion' and contraction, a paneled inner member having sides and ends receivable in the channels of the outer member, the sides and ends of the inner member being disposed with free space between same and the corresponding sides and ends of the outer member, whereby to provide for traotability of the yieldable means to seal the outer portions of the channels against the ingress of air into the spaces aforesaid between the two members.

5. An auxiliary window in accordancey with claim 4, wherein the inner member has slotted parts which extend toward the normal bottoms outer member and through the slots of the slotted y parts to simultaneously connect the members to the casing of the permanent window.

7. An auxiliary window in accordance with claim 4, wherein the yieldable sealing means is provided by forming the free edge portions of inner member relative to the outer member, and

the outer member with a part which projects inwardly at an angle toward, and frictionally contacts with, the adjacent portions of the inner member.

8. A building aperture sash, comprising in combination, a sash frame substantially rigid throughout its length, and a sash frame gripping seal that closely abuts the surface of the periphery of said building aperture and that is slidable both longitudinally of and toward and away from said sash frame in being mounted on said sash frame in adjustable tilting relation with the edge thereof.

9. A building aperture sash, comprisingl in combination, a sash frame for mounting in the casing forming the periphery of the building aperture, a three sided hollow seal having a pair of spaced edges in compressed adjustably tiltable vengagement against opposite sides of said sash frame,I and a screw entering said casing and having a head portion engaging one side of said seal and adjustably clamping both edges of said seal against said frame.

10. A structure of the character described for mounting across a building aperture comprising a panel receiving frame including rigidly connected side and transverse frame members, channel shaped sealing members embracing portions of the frame members and having spaced flanges slidable over opposite faces of the frame members for tilting and bodily movement of the sealing members relative to the frame members in adjusting the structure to apertures of difierent sizes and shapes, and means extending through the flanges of the sealing members for securing the structure in place and for drawing the ilanges together to clamp the frame members therebetween.

1l. A structure of the character described for mounting across a building aperture comprising a panel receiving frame including rigidly connected side and transverse frame members, channel shaped sealing members of thin metal embracing portions of the frame members and having spaced flanges slidable over opposite'faces of the frame members for tilting and bodily movement of the sealing members relative to the frame members' in adjusting the structure to apertures of different sizes and shapes, and means for drawing the flanges together to clamp the frame members therebetween and hold the structure in addustment.

12. A structure of the character described for mounting across a building aperture ycomprising a panel receiving frame including rigidly connected side and transverse frame members having inside and outside faces, sealing members of channel form embracing portions of the frame members and engaging the faces thereof. said sealing members being individually slidable on the frame members for bodily movement relative to the frame members to embrace larger or smaller portions thereof and for tilting movement relative to the frame-members in the plane of the latter, and means for securing the stxucture across a building aperture. Y

13. A structure of the character described for mounting across a building aperture vcomprising a panel receiving frame rigidly connected side and vtransverse -frame' members,

channel shaped sealing members of thin metal embracing portions of the frame members and having spaced anges slidable over opposite faces of the frame members for tilting and bodily movement of the sealing members relative to the frame members in adjusting thestructure to apertures of diiferent sizes and shapes, and means for drawing the anges together to clamp the frame members therebetween and hold the structure in adjustment, the marginal edge whereby said edges of thin metal are forced against and make line contacts with the frame members.

AR'I'HURAENSLCNGER l'

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