GB2310877A - Sealing, trimming and finishing strips - Google Patents

Description

SEALING. TRIMMING AND FINISHING STRIPS The invention relates to sealing, trimming and finishing strips.

Sealing, trimming and finishing strips embodying the invention, and to be described in more detail below by way of example only, are for use in motor vehicle body constructions.

According to the invention, there is provided a channel-shaped sealing, trimming and finishing strip for embracingly gripping a supporting edge, comprising a lip running longitudinally along an outside surface of the strip at a position spaced from the channel mouth and extending away from the channel in a sideways direction and curved over at least partially in a re-entrant manner to define a partially concave surface for embracingly receiving a longitudinal edge of a panel-like member, and a superimposed textile covering on a convex surface of the lip opposite to the concave surface, the textile covering extending over the distal edge of the lip and over a sufficient part of the concave surface of the lip to substantially prevent the covering from causing the lip to straighten under conditions of enhanced temperature.

According to the invention, there is further provided a sealing, trimming or finishing strip for fitting around a closable opening in a motor vehicle body, comprising a channel-shaped gripping portion for embracingly gripping a flange running around the opening and a cosmetic lip running longitudinally along the outside of the gripping part adjacent the base of the channel and extending sideways therefrom and curved in re-entrant manner to present a concave surface facing towards the mouth of the channel and a convex surface facing in the opposite direction, the concave surface, being adapted for embracingly receiving the edge of a vehicle trim part, and a textile covering extending over the whole of the convex surface of the cosmetic lip and continuously around the distal edge thereof and over substantially the whole of the concave surface thereof.

Sealing, trimming and finishing strips for use in motor vehicle body construction and embodying the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which: Figure 1 shows a cross-section of a known form of sealing, trimming and finishing strip; Figure 2 shows the strip of Figure 1 and illustrates the form which it may take under high temperature conditions; and Figure 3 shows a cross-section of one of the sealing, trimming and finishing strips embodying the invention.

The strip shown in Figure 1 is for sealing, trimming and finishing around an opening in a motor vehicle body, such as around a door opening. The strip comprises a channel-shaped gripping portion 10, a sealing portion 12, and a so-called cosmetic lip" 14. The gripping portion 10 mounts the strip on the flange 16 which runs around the door opening and which is formed where the inner and outer body panels 18, 20 are welded together at the door opening. The gripping portion 10 comprises extruded plastics or rubber material 22 of generally channelshape and extending longitudinally along all or part of the peripheral length of the door opening. The extruded material 22 is extruded to provide integral gripping lips 24 of relatively large size on one side of the inside channel wall and smaller gripping lips 26 on the opposite channel wall.The sizes and numbers of the gripping lips are shown purely by way of example.

The gripping portion 10 is reinforced by a channel-shaped metal core or carrier 28. The carrier 28 may be made of channel-shaped unapertured metal. Instead, it may be provided with slits or slots or other apertures to increase its flexibility. It may be formed of generally U-shaped elements joined together by integral connecting links or perhaps completely separated. Instead, the carrier may be of wire construction. Other forms of carrier are possible. The carrier 28 may be incorporated into the extruded material 22 by means of a known cross-head extruder.

The carrier 28 helps to reinforce the gripping portion 10 and to ensure that it is frictionally held on the flange in a firm manner. This process is assisted by the gripping lips 24, 26.

The gripping lips are advantageously made of relatively soft material which increases their frictional gripping effect. The material of the lips 24, 26 may be softer than the remainder of the channel-shaped extruded material 22.

The sealing portion 12 is mounted on one outside side wall of the gripping portion 10 and comprises, in this example, two parallel and integrally connected tubular sections 30 and 32. The tubular sections 30, 32 may be made of soft sponge rubber. The sealing section 12 may be produced separately and secured to the gripping portion 10 as by means of adhesive. Instead, however, it may be co-extruded with the gripping portion 10.

The gripping portion 10 mounts the sealing portion 12 on the flange 16 so that the sealing portion runs along the outside of the periphery of the door opening and is partially compressed by the closing door, thus forming a weather-proof seal.

The cosmetic lip 14 comprises a lip extending longitudinally of the strip and formed integrally with the extruded material 22 of the gripping portion 10. However, the material of the cosmetic lip 14 may be relatively stiff. The cosmetic lip 14 has a curved-over extremity to produce a concave under surface 34 (as viewed in the Figure) and a convex upper surface 36. The purpose of the cosmetic lip is to receive and to grip an edge of the interior body trim 38. The cosmetic lip 14 hides the possibly unsightly edge of the trim 38 and secures the edge in position.

In order to improve the appearance of the sealing, trimming and finishing strip, it may be provided with a cloth or textile covering 40 as indicated in Figure 1. This covering 40 extends from an edge 40A in contact or closely adjacent to the sealing portion 12 over the convex surface 36, and thence to an edge 40B on the inside facing surface 34 of the cosmetic lip 14, adjacent its free extremity. The cloth or textile coating 40 may be of appropriate colour to match the colour of the vehicle's interior body trim and to provide a pleasing appearance.

However, in the known form shown in Figure 1, it is found that, under enhanced temperature conditions, the textile covering 40 has a tendency to cause the cosmetic lip 14 to straighten, as shown in Figure 2; Figure 2 shows the shape which the cosmetic lip 14 of Figure 1 may assume in high temperature conditions (e.g. 900C) . This straightening of the cosmetic lip 14 is clearly unsatisfactory: the possibly unsightly edge of the trim panel 38 is no longer hidden or securely fastened and may therefore become visible and easily displaced.

Figure 3 shows a sealing, trimming and finishing strip embodying the invention, and parts in Figure 3 corresponding to those in Figures 1 and 2 are correspondingly referenced. In the strip of Figure 3, it will be noted that the textile or cloth covering 40 is extended fully over the concave surface 34 of the lip 14; the terminating line 40B is positioned beyond the radius where the cosmetic lip meets the adjacent outside side wall of the channel of the gripping portion 10. Under conditions of high temperature, as high as the situation illustrated in Figure 2, it is found that the cosmetic lip 14 of the strip of Figure 3 does not have any tendency to straighten-out.It is found that any shrinkage tendency caused by the textile or cloth covering 40 on the outside surface 36 of the cosmetic lip 14 (which would tend to cause the cosmetic lip to straighten-out) is balanced by a similar shrinking tendency of the covering 40 on the inside concave surface 34 of the lip 14. The net result is that the cosmetic lip 14 does not tend to straighten-out. It is found that the tendency for the cosmetic lip 14 to straighten-out is substantially removed provided that the covering 40 extends over at least 50k of the inside concave surface 34 of the lip, though best results are achieved if the covering extends over substantially the whole of the concave surface.

The gripping effect, and the enhanced appearance, provided by the cosmetic lip 14 are thus preserved under conditions of high temperature.

The sealing portion 12 may be provided with a longitudinally extending lip 42 for providing an additional sealing action against the body panel 20.

Claims (12)

1. A channel-shaped sealing, trimming and finishing strip for embracingly gripping a supporting edge, comprising a lip running longitudinally along an outside surface of the strip at a position spaced from the channel mouth and extending away from the channel in a sideways direction and curved over at least partially in a re-entrant manner to define a partially concave surface for embracingly receiving a longitudinal edge of a panellike member, and a superimposed textile covering on a convex surface of the lip opposite to the concave surface, the textile covering extending over the distal edge of the lip and over a sufficient part of the concave surface of the lip to substantially prevent the covering from causing the lip to straighten under conditions of enhanced temperature.

2. A strip according to claim 1, in which the lip extends sideways from the base of the channel.

3. A strip according to claim 2, in which the textile covering extends over at least part of the outside of the base of the channel and over the whole of the convex surface of the lip.

4. A strip according to any preceding claim, in which the textile covering extends over not less than 50% of the concave surface of the lip.

5. A strip according to any one of claims 1 to 3, in which the textile covering extends over the whole of the concave surface of the lip.

6. A strip according to claim 5, in which the textile covering extends from the concave surface of the lip onto the outside surface of the channel.

7. A sealing, trimming or finishing strip for fitting around a closable opening in a motor vehicle body, comprising a channelshaped gripping portion for embracingly gripping a flange running around the opening and a cosmetic lip running longitudinally along the outside of the gripping part adjacent the base of the channel and extending sideways therefrom and curved in re-entrant manner to present a concave surface facing towards the mouth of the channel and a convex surface facing in the opposite direction, the concave surface, being adapted for embracingly receiving the edge of a vehicle trim part, and a textile covering extending over the whole of the convex surface of the cosmetic lip and continuously around the distal edge thereof and over substantially the whole of the concave surface thereof.

8. A strip according to claim 7, in which the textile covering extends from the concave surface of the cosmetic lip onto the adjacent outside side wall of the gripping part.

9. A strip according to any preceding claim, including a sealing part extending longitudinally along the outside of the channel on the opposite wall thereof to the said lip.

10. A strip according to any preceding claim, in which the channel is made of extruded plastics or rubber or other similar flexible material.

11. A strip according to claim 10, including an embedded reinforcing carrier within the extruded material.

12. A sealing, trimming or finishing strip, substantially as described with reference to Figure 3 of the accompanying drawings.