Window sill and sash construction

Sept. 13, 1966

F. L. DUNSMOOR ET AL WINDOW SILL AND SASH CONSTRUCTION

Filed April 22, 1964

3,271,902

<img file="US3271902A_D0001.tif" />

3,271,902

Patented Sept. 13, 1966

United States Patent Office

3,271,902

WINDOW SILL AND SASH CONSTRUCTION Forrest L. Dansmoor, Oskaloosa, aod Herman S. Kuyper, Pella, Iowa, assizors to Rohcreen Company, Pella, Iowa, a corporation of Iowa

Filed Apr. 22, 19*4, Ser. No. 361,659

Claims. (0.49—483)

This invention relates to a window sill and sash construction of improved design having superior weatherstop characteristics.

One object of the invention is to provide a sill and sash construction in which a sloping sill member and a support leg therefor are so constructed and arranged that the lower surface of the outside edge of the sill member and the lower surface of the support leg are in the same horizontal plane whereby they may be directly mounted on the lower member of a window opening without the necessity of using blocking, triangular shims or the like to adequately support the sill at the proper angle with respect to the window opening.

Another object is to provide the support leg having a portion projecting above the top surface of the sill member so as to provide a barrier against water infiltration.

Still another object is to provide the lower sash of the window with a rabbeted portion receiving the upper . outside corner of the projecting portion of the supporting leg to agument the barrier characteristics of the sill construction.

A further object is to provide further augmentation of the barrier characteristics in the form of a weatherstop bar along the projecting portion which has an upstanding flange, the sash having a groove receiving this flange and being provided with a channel-shaped pile strip therein enclosing the upper marginal edge of the flange.

Still a further object is to provide a tongue and groove connection between the inside edge of the sill and the support leg for accurate location of the leg relative to the sill.

An additional object is to provide a separate sill nose piece which has a tongue and groove connection with the outside edge of the sill member and which in multiple window installations may be continuous along all the sill members thereby providing full support across a plurality of windows and eliminating on the outside of the building the usual space between adjacent sill members or the joint that would be required causing a vertical crack.

Another additional object is to provide a construction in which the stool for the window, instead of serving as a stop strip for the inside lower edge of the lower sash, is accurately located by a tongue and groove connection with the support leg.

With these and other objects in view, our invention consists in the construction, arrangement and combination of the various parts of our window sill and sash construction, whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in our claims and illustrated in detail on the accompanying drawing, wherein:

FIG. 1 is a vertical sectional view through a window sill and sash construction embodying our invention;

FIG. 2 is an enlargement of a portion of FIG. 1;

FIG. 3 is a perspective view of a section of the sill construction, and

FIG. 4 is a sectional view similar to a portion of FIG. 1 showing a modified form of construction.

On the accompanying drawing we have used the reference number 10 to indicate a sill member which has the usual sloping upper and lower surfaces 12 and 14, respectively. The sill member also has a level portion 16.

A sill support leg 20 extends along the inside edge of the sill member, having a tongue and groove connection 18-22 therewith for accuracy of location of one relative to the other. The support leg 20 has a lower surface 24 located in the same plane as the surface 16 5 of the sill member so that these two surfaces may be mounted directly on the lower member 21 of a window opening without the necessity of providing triangular blocking or the like. Furthermore, such blocking is usually provided at two or three points along the window IQ sill whereas the support leg 20 extends throughout the full length of the window sill so as to give full support for both the outside and inside edges of the sill. A construction of this character eliminates the possibility of mounting the sill at the wrong angle or providing in15 adequate support because of the wrong size of blocking or the shifting thereof after installation. In contrast, conventional double hung windows have a sloping sill requiring triangular blocking or shimming to set the window in the opening and provide solid bearing beneath the sill.

Also, the joint between the sill support leg and the sill itself is of the tongue and groove type which may be glued and nailed for weather tightness, accurate relationship and rigidity.

The lower sash of the window indicated at 28 is rab25 beted along the lower right comer· as shown in FIG. 1 to fit over the portion 26 of the support leg 20 which projects above the sill member 10 as shown at 26» in FIG. 3. This type of construction provides an effective weatherstop seal against infiltration of water and wind without 30 depending on the usual stool mounted on top of the inner inside marginal edge of the sill to serve as a stop for the sash and which introduces a crack between the stool and the sill which may be penetrated by water or wind.

To further augment the weatherstop characteristics of 35 the sill and sash construction, we provide a weatherstop bar 30 in the form of an aluminum extrusion or the like having an upstanding flange 32 projecting above the upwardly projecting portion 26 of the support leg 20. This bar is characterized by an L-shaped portion 34-36 hav40 ing terminal flanges 38 and 40 extending toward the adjacent surfaces of the support leg 20 and which surfaces are grooved as indicated at 42 and 44 to slidably receive the flanges 38 and 40 as shown in FIG. 3. Thus, the weatherstop bar 30 may be slid longitudinally into 45 position as shown by the arrow a in FIG. 3 and requires no further fastening means.

The lower rail 28 of the lower sash is grooved as indicated at 48 to receive the flange 32 and the groove is preferably lined with a channel-shaped pile strip 48 50 which encloses the upper marginal edge of the flange 32 in the closed position of the sash as shown in FIGS. 1 and 2. Thus, the portions 32 and 34 of the weatherstop bar 30 serve as a dam of considerable height against water infiltration and the coaction of the pile strip 48 55 with the flange 32 provides a positive seal against any possibility of water or wind passing up around the flange 32 and finding its way into the room under the inner lower marginal edge of the sash.

We also provide a sill nose piece 50 having a tongue 60 and groove connection 52-56 with the outside edge of the sill member 10 instead of the members 10 and 50 being integral according to conventional construction. This arrangement permits the sill nose piece to be continuous across two or more windows when installed 65 side-by-side and eliminates any butt joint between adjacent sills in such an installation thereby enhancing the appearance of the installation and eliminating joints that have to be caulked on the outside of the building. Likewise the weatherstop bar 30 may extend throughout the 70 length of two or more support legs 20 thus cooperating with the sill nose piece 50 in rigidifying installation of the several window frames. The sill nose piece is pref3,271,00½ erably provided with the usual drip bead 51. The sash rail 28 is also preferably provided with a drip bead 29 as shown in FIG. 1.

In FIG. 1 we show a stool 58 having a tongue and groove connection 60-62 with the support leg 2*. This is a further improvement in a window sill and sash constraction of the kind disclosed. Usually the stool is mounted on top of the inside marginal edge of the sill. The tongue and groove connection accurately locates the stool, and this type of construction also lends itself to the use of an extension mold such as shown at 64 in FIG. 4 and inside trim 66 to “picture frame” the window if this is desirable in place of using the stool 58 of FIG. 1.

From the foregoing specification it will be obvious that we have provided a sill construction which is unique in that it does not depend on a stool to act as a weatherstop. By incorporating a sill support leg on the room side of the window, triangular blocking or shimming to set the window in the opening and provide solid bearing beneath the sill is eliminated due to our construction wherein the surfaces 16 and 24 may be set squarely on the upper surface of the window frame member 21.

A very effective weatherstop connection is provided between the sill and the sash in the area illustrated in FIG. 2 and our construction has further features of superiority with respect to conventional windows in use of the sill nose piece 50 and the tongue and groove connection between the stool 58 and the sill construction.

In addition to providing an excellent weather barrier, the weatherstop bar 30 also makes a convenient transi- ₃₀tion point between the interior and exterior finishes of the window. When the lower sash rail 28 is in the closed position the double pile strip 48 grips both sides of the flanges 32 giving maximum protection against water and wind infiltration. ₃By providing a sill nose piece 50 with a tongue and groove fit with respect to the sill member 10, where several window units are jointed together the sill nose piece is continuous thus providing a superior multiple-window installation. The member 20 besides serving as a sill 40 support leg also serves as a weatherstop thus eliminating the necessity of having a stool serve this purpose as in conventional windows.

Some changes may be made in the construction and arrangement of the parts of our window sill and sash 45 . ₄ construction without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims any modified forms of structure or use of mechanical equivalents which may reasonably be included within their scope.