Sealing or guiding strip, window frame assembly, and method of making window frame assembly

Abstract: A window frame carried on the door of a vehicle is in the form of an aluminium extrusion (20) having a smooth bend (22) in the region where the top of the frame meets the corner between the "B" pillar of the vehicle and the vehicle roof. The window glass (not shown) has a sharp angle matching this corner. The aluminium extrusion (20) carries a flange (26) and is formed with a channel (24) by means of which the window sealing and guiding strip (not shown) can be secured to the frame. The sealing and guiding strip has a mitred corner matching the sharp angle of the window glass. For supporting the sealing and guiding strip in the region of this corner, a separate metal corner piece (80) is provided. This has a shoulder (86) which is a tight press fit into the channel (24) on the aluminium extrusion. It is supplied to the vehicle manufacturer already attached to the sealing and guiding strip itself, so that the strip and the corner piece (80) can be fitted to the frame in substantially a single press-fit operation. The metal piece (80) is secured to the sealing and guiding strip during the moulding operation which produces the mitre-corner in two lengths of the strip which meet at the corner.

Description: The invention relates to sealing or guiding strips for window panes and methods of making window frame assemblies. Embodiments of the invention, to be described in more detail below, are for use in motor vehicle body construction and, in particular, for use in window frames forming the upper part of vehicle doors, the frame supporting the edge of a window pane which can be raised from and lowered into the lower part of the door. However, the invention is not restricted to such applications. Window panes in certain applications have one or more sharp corners. Various means are known for adapting flexible material of a sealing or guiding strip so that it forms a sharp corner corresponding to the sharp corner of the window pane. The invention is concerned with support for the sealing and guiding strip at the corresponding sharp corner. As an example only, the sealing or guiding strip may comprise flexible material defining two channels meeting at the corresponding sharp corner is a mitred joint. According to the invention, there is provided in combination, a sealing or guiding strip for sealing or guiding a sharp corner of a window pane and a stiff corner piece, the strip comprising flexible material for contacting the window pane and arranged to define a sharp corner matching the sharp corner of the window pane, the stiff corner piece being attached to the flexible material in the region of the corresponding sharp corner of the strip for supporting it there. According to the invention, there is further provided in combination, a sealing and guiding strip for a window opening which has a window pane defining a sharp corner of predetermined angle and which also has a relatively rigid frame defining a smooth curve at and bridging across the sharp corner corresponding to the sharp corner of the window frame, and a rigid support member, the strip comprising respective lengths of flexible material defining two channels meeting at a sharp corner, the two channels being sized to receive the edges of the window pane meeting at the sharp corner of the window pane, the rigid support member being secured to the flexible material at the corresponding sharp corner for supporting it there and having a profile which follows the two channels meeting at the corresponding sharp corner and which also defines a curved region bridgingly extending between the two lengths of the strip on the inside of the corresponding sharp corner and matching the smooth curve in the frame. According to the invention, there is also provided a method of constructing a window frame assembly carried by the upper part of a door in a vehicle body the window pane of which defines a sharp corner, comprising the steps of forming a relatively rigid window frame for the window opening, forming a combination such as set out above of a channel-shaped sealing and guiding strip and a rigid support member, transporting the two meeting channels with the support member attached thereto to the frame, and securing them to the frame so that the channels of the flexible material seal over the edge of the window frame and so that the flexible material is supported from the frame at the corresponding sharp corner by the rigid support member and is directly supported by the frame elsewhere. Further developments in line with claims 1, 4 and 13 are referred to in the dependent claims. A window sealing and guiding strip embodying the invention, and a method according to the invention of constructing a window frame assembly, will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which: Figure 1 is a side view of a motor vehicle body; Figure 2 is a diagrammatic perspective view of part of the window frame shown circled at II in Figure 1 but omitting the window sealing and guiding strip; Figure 3 is a diagrammatic side view of one form of the sealing and guiding strip; Figure 4 is a cross-section on the line IV-IV of Figure 1, showing the sealing and guiding strip of Figure 3 in position on the frame; Figure 5 is a cross-section on the line V-V of Figure 1, showing the sealing and guiding strip of Figure 3 in position on the frame; Figure 6 is a perspective view of a corner piece for the sealing and guiding strip; and Figure 7 is a perspective view of the frame of Figure 2 but also showing the corner piece in position thereon. Figure 1 shows the side of a motor vehicle body having a door 5 with a lower part 6 carrying a window frame indicated diagrammatically at 8 for a window opening 10. In the usual way, a window glass for the opening 10 can be raised from and lowered into the lower part 6 of the door. The frame 8 carries the sealing and guiding strip 11 (not visible in Figure 1) which will be described in detail below. The frame 8 comprises a part 8A along the sloping front of the door which is alongside the so-called "A" pillar of the vehicle body, a generally vertical part 8B alongside the so-called "B" pillar 12 of the vehicle body, and a part 8C running along the top of the door. Where the "B" pillar 12 meets the roof 14 of the vehicle, a sharp angle (substantially 90 o ) is formed, at 16. In a manner to be explained below, the sealing and guiding strip 11 to be described combines with the frame 8 to form a corresponding sharp angle 18. The frame 8 carried by the door is (in this example) made of metal, such as extruded aluminium. Figure 2 shows part of the frame 8 at the corner 18 and is an enlarged view of the region II of Figure 1. The sealing and guiding strip is omitted from Figure 2. As indicated in Figure 2, the frame is made of a hollow aluminium extrusion 20 which has a curved portion 22 at the corner 18. As shown in Figure 1, therefore, this curved portion 22 bridges across the sharp corner. Facing outwardly of the vehicle, the aluminium extrusion 20 defines a channel 24 and an outwardly protruding flange 26. However, it will be noted that the flange 26 is interrupted (that is, omitted) over the curved region 22 of the extrusion, so as to form a gap 28. Figure 3 shows the sealing and guiding strip 11 in side view as it appears from the outside of the vehicle when fitted onto the aluminium extrusion 20 (in a manner to be explained), Figure 3 showing the sealing strip in the form which it has in the region of the corner 18. As shown in Figure 3, the strip 11 is made up of two lengths 30A and 30B whose forms will be described in detail below. They are connected together by a "mitred" joint at 32 to match the angle 18 (Fig. 1). In a manner to be described in more detail below, the strip 11 provides a channel in which the window glass slides in use. The strip 11 continues, of course, over the remainder of the window frame 8. Figure 4 shows a cross-section through the length of strip 30B (Fig. 3) when fitted in position onto the corresponding portion of the aluminium extrusion 20. As shown, the strip is made of extruded plastics or rubber material 50 defining a channel 52 in which the window glass (not shown) slides. The channel 52 is defined in part by a lip 54 on the outside of the vehicle and in which is embedded a metal carrier 56 for reinforcing purposes. The metal carrier 56 may take any suitable form. It may be solid strip or it may be apertured or in other manner arranged to be slightly flexible. The metal carrier 56 extends around the base of the channel 52 and into thicker material 58 which forms the opposite side of the channel 52 and extends away from the channel 52 to define a lip 60 providing a shoulder 62. The portion of the metal carrier 56 within the lip 54 strengthens the lip 54 so that the lip can be of minimal thickness. In this way, there is little material on the outside of the window glass in use and a substantially "flush glass" effect is produced. The material 50 extends in the opposite direction to the lip 54 to produce a further lip 64, and also defines a slot 66. As shown in Figure 4, the flange 26 of the aluminium extrusion 20 forming the window frame (see Fig. 2) extends into the slot 66 and is gripped thereby, and the lip 60 and shoulder 62 extend into the channel 24 of the aluminium extrusion, the shoulder 62 locking under a corresponding ridge 68 of the extrusion. The lip 60 makes contact with the opposite side of the channel 24 and holds the shoulder 62 and the ridge 68 in engagement with each other. On the inside of the channel 52, the material 50 defines inwardly extending flexible lips 70 and 72 which flex upon entry of the window glass and help to seal against its opposite faces. The underside of the lip 54 and the outwardly facing surfaces of the lips 70 and 72 are preferably covered in flock 74 or similar material to provide reduced friction and enhanced sealing againsts the glass. The lip 64 bridges over the gap between the outside of the window frame 8 and the adjacent "B" pillar of the vehicle body. Figure 5 corresponds to Figure 4 but shows the form which the length of strip 30A (see Fig. 3) takes, that is, the form which it takes along the top of the door. As shown, it is of the same general form as shown in Figure 4 and corresponding items are similarly referenced. It will be noted, though, that the strip 30A does not contain the metal carrier 56. Figures 4 and 5 show how the lengths 30A and 30B of strip 30A and 30B are supported on the extrusion 20. However, it will be apparent that the strip 11 cannot be supported in the same way in the immediate region of the corner 32 (see Figure 2), because, over this region, the strip 11 has a sharp corner, whereas the aluminium extrusion 20 has a smooth bend 22. In order to support the strip 30 in the region of this corner, therefore, a corner piece 80 (Fig. 6) is used. The corner piece 80 is preferably made of metal such as aluminium. It is of simple construction comprising a platform 82 which, on one side, carries a flange 84 of the same general thickness as the flange 26 on the aluminium extrusion 20 (see Fig. 2), and, on its other side, carries a thicker shoulder 86. The corner piece 80 is shaped to provide an outside edge 88 which matches the angle at the corner 18. Its opposite edge 90 is curved to match the outside radius of the curved portion 22 (see Fig. 2) of the aluminium extrusion 20. The corner piece 80 is secured to the strip 11 at the mitred corner 32 (Fig. 3). This is achieved by fitting the flange 84 of the corner piece 80 into the slots 66 (see Figs. 4 and 5) in the lengths 30A and 30B of the strip; at the mitred corner, the slots 66 will of course not be filled by the flange 26 (Fig. 2) of the aluminium extension 20, because the flange is omitted from the extension at the position of the corner. This fitting process is carried out during the assembly operation which forms the mitred corner between and connecting the lengths 30A and 30B of strip. This assembly process is carried out in a mould. The end faces of the two lengths 30A and 30B of strip are respectively cut at the correct angles and placed in a mould which also contains the metal corner piece 80. The lengths 30A and 30B of strip are fitted onto the corner piece 80 by ensuring that the latter's flange 84 fits into the slots 66. The mould is then closed and heat is applied so as to seal the cut end faces of the strip lengths 30A and 30B together and to secure them to the metal corner piece 80. The length of strip 30, matching the complete length of the window frame 8, and also carrying the corner piece 80, is then ready for fitting onto the window frame. As already explained, this process is carried out by inserting the lip 60 and the shoulder 52 of the lengths 30A and 30B of strip into the channel 24 of the aluminium extrusion 20, so that the flange 26 of the latter becomes inserted into the slot 66. In addition, however, the fitting process involves the attachment of the metal corner piece 80 to the extrusion 20, over the latter's curved region 22 (Fig. 2). This is achieved by slotting the shoulder 86 (Fig. 6) of the corner piece into the channel 24 over the curved region, in which it is a tight fit. Figure 7 shows the appearance of the window frame when the corner piece 80 is in position. For clarity, though, the sealing strip 11 itself is not shown in this Figure. This Figure shows how the corner piece 80, now being firmly supported on the aluminium extrusion 20, can in turn support the sealing strip in the region of the corner 18. The corner piece 80 is preferably covered in rubber; this may be carried out during the above-mentioned moulding operation. It may also be flocked. In this way, therefore, the window frame itself (the aluminium extrusion 20) can be arranged to have a smooth curve in the region of the corner 18 of the door. This simplifies construction of the frame considerably. If the frame had to have a sharp corner matching the angle 18, a welding operation would be necessary. The smooth curve can be achieved by a much simpler bending operation. Nevertheless, the corner piece 80 enables the sealing strip 30 to have the required sharp corner to match the angle 18 and to provide proper support for the corner of the window glass and effective sealing. However, the corner piece is carried by and secured to the strip 11 and its manufacture and attachment to the sealing strip is carried out by the sealing strip supplier, not by the vehicle manufacturer. All that the vehicle manufacturer has to do is to attach it and the sealing strip in substantially a single operation to the window frame. For example, the vehicle manufacturer is not involved in any complicated welding operation to secure the corner piece 80 in position; it is simply a matter of a press-fitting operation. The corner piece 80 can be arranged to lock into the channel 24, instead of merely being a press fit therein. For example, its shoulder 86 can be provided with a formation to lock under the undercut 24A (Fig. 7). The arrangement described is advantageous in that it enables the frame of the door opening to be of stronger construction: this is because the frame can be of curved configuration at the point 16 (Fig. 1) instead of being a sharp corner. The inner door seal (that is, the door seal attached to the frame of the door opening) can be of correspondingly curved shape - that is, it can be formed by a length of seal simply bent to follow the curve of the frame. It is not necessary for it to be formed with a mitred corner. Thus, from the outside of the vehicle, with the door closed, the appearance is that of a mitred corner, yet the door and body construction is simply curved.

Claims: In combination, a sealing or guiding strip (11) for sealing or guiding a sharp corner (16) of a window pane and a stiff corner piece (80), the strip (11) comprising flexible material (50) for contacting the window pane and arranged to define a sharp corner (18) matching the sharp corner (16) of the window pane, the stiff corner piece (80) being attached to the flexible material (50) in the region of the corresponding sharp corner (18) of the strip (11) for supporting it there. A combination according to claim 1, characterised in that the corresponding sharp corner (18) is formed by securing together two matchingly shaped faces of the flexible material (50). A combination according to claim 1 or 2, characterised in that the stiff corner piece (80) has an outer profile matching the corresponding sharp corner (18), and a curved inner profile. In combination, a sealing and guiding strip for a window opening which has a window pane defining a sharp corner (16) of predetermined angle and which also has a relatively rigid frame (8) defining a smooth curve at and bridging across the sharp corner (18) corresponding to the sharp corner (16) of the window pane, and a rigid support member (80), the strip comprising respective lengths (30A,30B) of flexible material (50) defining two channels meeting at a sharp corner (18), the two channels being sized to receive the edges of the window pane meeting at the sharp corner (16) of the window pane, the rigid support member (80) being secured to the flexible material (50) at the corresponding sharp corner (18) for supporting it there and having a profile which follows the two channels meeting at the corresponding sharp corner (18) and which also defines a curved region (90) bridgingly extending between the two lengths (30A,30B) of the strip (11) on the inside of the corresponding sharp corner (18) and matching the smooth curve in the frame (8). A combination according to claim 4, characterised in that the support member (80) includes means (86) for lockably mounting it on the frame (8). A combination according to claim 5, characterised in that the support member (80) defines a rigid projection (86) running along its curved profile (90) and sized to fit lockingly into a corresponding channel (24) in the curve of the frame (8). A combination according to any one of claims 4 to 6, characterised in that the flexible material (50) includes means (66) for mounting it on the frame (8). A combination according to claim 7, characterised in that the flexible material (50) defines a slot (66) extending longitudinally along its length for embracingly gripping an edge or flange (26) on the frame (8), whereby the strip (11) is mounted on the frame. A combination according to claim 8, characterised in that the support member (80) defines an edge or flange (84) which is embracingly gripped by the said slot (66) whereby the support member (80) is secured to the flexible material (50). A combination according to claim 8 or 9, characterised in that, when the support member (80) is fitted in position on the frame (8), its edge or flange (84) is aligned with the edge or flange (26) on the frame (8). A combination according to any one of claims 7 to 10, characterised in that the flexible material (50) defines a projecting part (62) which extends along the length of the strip (11) and which, in use, lockingly engages a channel (24) running along the frame (8) whereby the strip is mounted on the frame (8). A method of constructing a window frame assembly carried by the upper part of a door (5) in a vehicle body the window pane of which defines a sharp corner (16), comprising the steps of forming a relatively rigid window frame (8) for the window opening, forming a combination according to any one of claims 4 to 11 of a channel-shaped sealing and guiding strip (11) and a rigid support member (80), transporting the two meeting channels (30A,30B) with the support member (80) attached thereto to the frame (8), and securing them to the frame (8) so that the channels of the flexible material (50) seal over the edge of the window frame and so that the flexible material (50) is supported from the frame (8) at the corresponding sharp corner (18) by the rigid support member (80) and is directly supported by the frame (8) elsewhere. A method according to claim 12, characterised in that the step of attaching the two meeting channels (30A,30B) of flexible material (50) and the support member (80) to the frame (8) comprises a press-fitting step.

Inventors: ECKART RALF, ECKART, RALF
Applicants: DRAFTEX IND LTD, DRAFTEX INDUSTRIES LIMITED
Application year: 1993
Main classification: B60J10
IPC codes: B60J10