GB2508634A

GB2508634A - A pultruded or extruded plastic window sill fascia unit

Info

Publication number: GB2508634A
Application number: GB201221954A
Authority: GB
Inventors: Fredrick J Holme
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-06
Filing date: 2012-12-06
Publication date: 2014-06-11

Abstract

A facia profile for a window sill is manufactured by a plastic extrusion or glass reinforced plastic pultrusion process and has a base platform which is anchored to the wall and a hollow section which rests against the wall and has a hollow protuberance. The base platform comprises a flat platform 1 with a narrow edging strip 2 turned down by 90 degrees and a surface 3 along the other edge turned down by 90 minus X degrees before a further surface 4 turned down by X degrees before it turns at right angle to underlay the sloped surface, whereupon it turns up at a right angle to form an edging strip. Once the profile is cut to size and fitted with end plates (8 Figure 3), the base platform is laid upon a course of bricks in a wall to allow the profile to rest against the external surface of the wall and form a trapezium shaped casement protrusion. The flat portion may have orifices along its upper surface, these holes allow mortar to penetrate and embed the platform in the wall.

Description

A LIGHTWEIGHT AND LOW CARBON FOOTPRINT PULTRUDED OR

EXTRUDED WINDOW SILL FASCIA UNIT

THE iNVENTION The present invention relates to sills for use in the construction industry, particularly but not exclusively to sills used at the base of window cavities to provide a sound base for window frames, to shed rainwater away from the underlying wall structure and to enhance the aesthetic properties of the construction.

BACKGROUND

Traditionally, window frames have been installed in brick walls above window sills fabricated from materials such as stone, concrete or wood built into brick walls by replacing a brick course, or two, the width of the window frame and protruding from the wall to form a ledge The purpose of such traditional window sills is to a) providc a stable base on which to mount the window frame, b) to guide rainwater away from the wall and c) improve the, aesthetic appearance of the wall. However, window sills fabricated from traditional materials possess several drawbacks. They are generally heavy, difficult to transport and require medhanical assistance. With the exception of wood they must be manufactured off-site to a range of different sizes required to match the different window sizes to be built into the construction and are not suitable to be cut to size on-site. Finally, traditional sill materials possess relatively high carbon footprints.

The present invention seeks to overcome these drawbacks and provide enhanced aesthetic opportunities by creating a novel product suitable for manufacture in Glass Reinforced Plastic (GRP) composites by a pultrusion process or by extrusion of thermoplastics, such as Polyvinyl Chloride (PVC) or engineering plastics, such as ABS. These processes are particularly useful for the manufacture of products based on extended longitudinal profiles which substantially describes the present invention.

BRTEF DESCRIPTION OF THE INVENTION

The present invention is an overlap sill formed from a longitudinal profile with a flat section which hooks securely over the outer course of bricks in a wall to provide a platform on which to mount a window frame with a profile, overlapping the wall and hanging pendant over the external wall surface to form a casement or protruding facia attached along one edge of the flat section. The other edge of the flat section is turned down through ninety degrees to hang parallel to the casement serves to guide the sill into position and hold it in position while the fixative, e.g. mortar, sets.

The window sill facia profile of the invention may be manufactured in lengths from one to twelve metres and may be cut to size and fitted on site by an installer working alone. Once cut to size end-caps are added to the casement profile to strengthen it and prevent water ingress.

The protruding facia may be exploited to change the aesthetic properties of the wall by virtue of the wide range of colours it is possible to imbue the selected materials of construction with and the range of sculpted patterns possible, i.e. compatible with longitudinal profiles, with the selected manufacture methods.

DETAILED DESCRIPTION OF THE INVENTION

The invention will now be described in detail with reference to drawings 1 to 3. It should be noted that the invention is designed to be manufactured by a pultrusion or an extrusion process, using materials such as fibre-glass or basalt rovings and matting impregnated with fire-retardant polyester or polyurethane resins and engineering plastics, and as such longitudinal measurements are of no relevance, other than to the specification of an individual processing site. Unless otherwise stated, all measurements provided in this document refer to the shape of the profile and not the length, which is limited only by the characteristics of the manufacturing process employed.

DRAWING 1 Drawing I shows an isometric representation of the profile and shows a fir st surface that forms a platform (1) bound along one edge by a first edging strip (2) of from 10 mm to 40 mm, preferably 15 mm to 25 mm turned down at a right angle from the platform and along the other edge by a second surface (3), which forms the top of a protuberance, angled down from the platform (1) by less than ninety degrees (90 -degrees). The second surface extends from 80mm to 160 mm, preferably 55 mm to 110 mm, before turning down to form a third surface (4) which hangs at a right angle to the first surface ( degrees from the second surface) and extends from 85 mm to 185 mm, preferablylO0 mm to 124 mm, before bending at right angles to itself toward the wall to form a fourth surface (5). The fourth surface continues until a point directly under the junction of the first (1) and second (3) surfaces when it again turns up at a right angle to itself to form a second edging short strip (6) of from 5 mm to 30 mm, preferably 10 mm to 20 mm in width.

A ckip groove (9) is formed in the underside of the fourth surface (5) close to its junction with the third surface (4). The first surface is provided with orifices (7) of 20 mm to 45 mm in diameter, preferably from 30 mm to 40 mm in diameter at intervals of from 100mm to 175 nun, preferably 130mm to 160 mm, along its length. When pressed into the mortar layer on top of a course of bricks, the mortar rises through the orifices and together with the edging strip (2) fixes the location of the profile when the mortar sets.

DRAWING 2 Drawing 2 shows a cross-section of the profile which is substantially of uniform thickness in the range from 2mm to 6 mm, preferably from 3.5 mm to 4.5 mm. The second surface (3), third surface (4) and fourth surface (5) form an empty trapezium when the first surface (1) is placed in position on top of a course of bricks in a wall and the second strip (6) is resting against the external wall. The angle made by the second surface (3) rclative to the platform (1) and the detailed profiling of the third surface (4) may be varied to alter the extent of the protrusion from the wall and its aesthetic appearance, provided the profiling of the third surface (4) is longitudinal in nature and compatible with the pultrusion or extrusion manufacturing process.

DRAWING 3 Figure 3 is an isometric representation of the profile from the rear showing the end- caps (8) attached to the cut ends of the profile once it has been cut to size. These end-caps may be fabricated from any convenient thermoplastic material by an injection moulding tecbnique and maybe attached by way of lugs moulded onto the inside face to guide and hold the end-cap (8) in position while conventional adhesive sets

MODE OF USE

In a first embodiment the overlap sill of the present invention is used as a base plate for a window frame inserted in a wall. In use the sill and facia profile is cut to a length appropriate to the width of the window frame to be inserted in the wall and fined with end caps. It is pressed into a layer of mortar on top of a course of bricks in the external wall in the position that the window frame is to occupy with the facia protuberance resting against the external surface of lower courses of bricks in the wall. Positioning of the sill and facia profile is assisted by the first edging strip (2) which hooks over the brick course and the second edging strip (6) which rests securely against the external wall. The window frame is mounted and fixed above the sill and facia unit by normal procedures known to those versed in the art.

In a second embodiment the overlap sill of the present invention may be used in lengths up to 6 meter to interrupt the surface of a wall for purely aesthetic purposes.

In this embodiment the sill and facia profile is incorporated into an exterior wall between two courses of brick or other building materials as in the first embodiment with the protuberance forming an aesthetic feature stretching horizontally across the external surface of the wall. In this embodiment the use of end caps may be restricted to the end of facia runs.

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