GB2136484A

GB2136484A - Draught reducing methods

Info

Publication number: GB2136484A
Application number: GB08306871A
Authority: GB
Inventors: Leighton John Michael Hall; Robert William Tunnicliffe
Original assignee: Ventrolla Ltd
Current assignee: Ventrolla Ltd
Priority date: 1983-03-12
Filing date: 1983-03-12
Publication date: 1984-09-19
Also published as: GB2136484B; GB8306871D0

Abstract

A weatherseal 21 for a wooden window is installed by cutting an angled groove 16 in the rebate 13 in the main frame. The groove is cut at an angle so that it is directed away from the outer edges of the rebate so preventing damage to and splintering of the frame and providing a secure attachment for the sealing strip. The rebate surface is cut away at 17 so that the sealing strip can lie below the level of the original rebate surface. The method can also be used on doors. <IMAGE>

Description

SPECIFICATION Draught reducing methods The invention relates to the reduction of draughts between a closure such as a casement or a door and a frame in which the closure is received in a corresponding rebate in the frame.

Because of manufacturing tolerances and shrinkage and warping which can occur in wooden windows, for example, there is generally a substantial gap between the casement and the window frame. This allows cold air to enter a property including such a window and this can increase the heat required from any heating system within the property to maintain a particular temperature. In addition, such air causes draughts which chill persons within the property leading to discomfort. In addition, such air currents can convey dust and dirt into the property. Further, water may pass through the gaps and into the property. For these reasons, the existence of such gaps is undesirable.

According to the invention, there is provided a method of reducing draughts between a closure and a wooden frame in which the closure is received in a corresponding rebate in the frame, the method comprising cutting a continuous groove in one rebate surface, the groove extending both along the rebate surface and being angled towards the pane of the other rebate surface, and then inserting into said groove a root of a continuous sealing strip for sealing engagement with the casement.

The method may comprise locating the entrance to the groove adjacent the insersection of the rebate surfaces.

In addition, the method may also comprise cutting away the groove containing surface of the rebate so that at least a part of the sealing strip lies beneath the level of the original surface.

The method may comprise cutting a groove around the whole periphery of the frame.

Where the rebate surfaces lie in planes normal and parallel respectively to the plane of the frame, the method preferably comprises cutting the groove and inserting the sealing strip in that rebate surface which is parallel to the plane of the window.

The following is a more detailed description of an embodiment of the invention, by way of example, reference being made to the accompanying drawings in which: Figure 1 is a section through part of a wooden window, Figure 2 is a view of a part of the window of Fig. 1, to a larger scale, showing a casement receiving rebate, and Figure 3 is a similar view to Fig. 2 but showing a sealing strip fitted in the rebate.

Referring first to Fig. 1, a wooden window comprises a frame 10 and a glazed casement 11 which is received in a corresponding rebate 12 provided around the window frame 10. The casement 11 may be square or rectangular or any other shape or may be top or side hung. The rebate 12 is formed of two mutually perpendicular surfaces 13, 14, one 13 of which is parallel to the plane 15 of the window frame (shown in chain dotted line in Fig. 1) and the other 14 of which is normal to said plane.

Referring next to Figs. 2 and 3, draughts are reduced or eliminated in the following way. First, a groove 16 is cut in that surface 13 of the rebate 12 which is parallel to the plane 15 of the window frame. This may be done by using a rotary cutter (not shown) carried on a framework which holds the cutter at the correct angle and which uses the window frame as a guide. The groove 16 extends all around the window opening defined by the rebate 12. The entrance to the groove is adjacent the junction between the two rebate surfaces 13, 14 and extends at an angle to the surface 13, in which which it is formed; the inclination being towards and through the plane of the other rebate surface 14 (see Fig.

2).

In this way, the groove 16 is formed in the most solid part of the window frame 10 and the possibility of the edges of a frame being splintered is reduced to a minimum. Although a groove 16 is shown which is generally rectangular in cross-section, a groove of any convenient shape may be cut.

Next, the surface of the rebate adjacent the groove is cut away, as shown in broken line at 17 in Fig. 2. This cut-away portion includes the corner between the rebate surface and the adjacent frame surface 18. A small portion of the original surface 13 is left adjacent the join with the other rebate surface 14 and an inclined cut-away section 19 leads from this original surface to the entrance to the groove 16.

A sealing strip is then inserted into the groove 16. The sealing strip comprises a body portion 21 joined to an upwardly and outwardly extending end portion 23. A portion 23. A root 24 depends from the body portion 21 at an angle. The end of the body portion opposite the root 24 carries an abutment 25 and a sealing flange 26 which overlies the body portion 21. The sealing strip is extruded from any suitable plastics, rubber or thermo plastic rubber material.

The root 24 is inserted in the groove 16 and is retained therein by fins or similar mouldings (not shown) formed on the root.

The end portion 23 covers the inclined cut away section 19 between the groove 16 and the remaining original rebate surface 13, while the body portion 21 overlies the cut away surface 17. The abutment 25 includes a rebate 27 into which the edge between the cut-away surface 17 and the outer frame surface 18 fits, so preventing this edge splintering.

In this way, the sealing flange 26 is positioned to engage the casement 11 as the casement 11 closes, with the abutment 25 providing a limiting stop on final closure of the casement 11. Because the groove 16 is angled, the insertion of the root 24 does not weaken the frame 10. Since the surface 17 is cut away, the body 21 of the sealing strip lies below the original level of the rebate surface 17 thus providing a recess into which the flange 26 can be received if the casement 11 is a very tight fit in the rebate 12. In view of the position of the flange 26, air passing between the casement and the frame pushes the flange 26 into contact with the casement 11, so improving the seal.

It will be appreciated, that the sealing strip could be mounted in the surface normal to the plane 15 of the window frame 10. It will also be appreciated that sealing strips other than that described above with reference to the drawings could equally well be used. The rebate surface need not be cut away, benefits could be derived from the use of the angled groove by itself.

While the specific embodiment described above with reference to the drawings relates to a window, it will be appreciated that a similar technique could be used in a doorway where a door is received in a rebate in a wooden frame or where any closure is received in a rebated frame.

It will also be appreciated that the method described above is well suited to windows and doors that are already installed. Since the groove is cut in the frame rebate, this can be done from the interior of the property in which the window or door is fitted thus obviating the need for the use of ladders.

Claims

1. A method of reducing draughts between a closure and a wooden frame in which the closure is received in a corresponding rebate in the frame, the method comprising cutting a continuous groove along one rebate surface, the groove being angled relative to the plane of said one rebate surface so that the groove extends towards or through the plane of the other rebate surface, and then inserting into said groove a root of a continuous sealing strip for sealing engagement with the casement.

2. A method according to claim 1 and comprising locating the entrance to the groove adjacent the intersection of the rebate surfaces.

3. A method according to claim 1 or claim 2 and comprising cutting away the groove containing surface of the rebate so that at least a part of the sealing strip lies beneath the level of the original surface.

4. A method according to any one of claims 1 to 3 and comprising cutting a groove around the whole periphery of the frame.

5. A method according to any one of claims 1 to 4 and in which the rebate surfaces lie in planes respectively normal and parallel to the plane of the frame, the method comprising cutting the groove and inserting the sealing strip in that rebate surface which is parallel to the plane of the window.

6. A method of reducing draughts substantially as hereinbefore described with reference to the accompanying drawings.

7. A window or door having a closure and a frame in which the closure is received in a corresponding rebate of the frame, the frame being sealed against draughts by the method of any one of claims 1 to 6.

8. A draught-sealed window or door substantially as hereinbefore described with reference to the accompanying drawings.