Sealing, trimming and finishing strips

Abstract: A sealing, trimming or finishing strip for fitting to the flange (16) around the edge of a door or similar opening in a motor vehicle body has a channel-shaped gripping portion (10) supporting a tubular sealing portion (12) on the outside of the door opening and onto which the door sealingly closes. On the inside of the door opening, a cosmetic lip (14) integrally extends and is curved-over to form a concave surface (34) for embracingly receiving and gripping the edge of a trim panel (34). A cloth or textile covering (40) extends over the outside surface (36) of the cosmetic lip (14), around its distal edge and over the whole of the concave surface (34) of the lip to terminate at a point (40B) on the outside side wall of the gripping portion (10). Because the textile covering (40) extends over the whole of the concave surface (34) of the cosmetic lip (14), as well as over the convex surface (36) thereof, instead of only partially over the concave surface (34), any tendency for the cosmetic lip to straighten under the effect of enhanced temperature on the textile covering (40) is substantially avoided.

Description: The invention relates to a channel-shaped sealing, trimming and finishing strip for embracingly gripping a supporting edge, comprising a strip body of channel-shape, a lip running longitudinally along an outside surface of the strip body at a position spaced from the channel mouth and extending away from the channel in a sideways direction from that outside surface 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 having a terminating edge which is closely adjacent a sealing portion and from that edge the covering extends over a convex surface of the lip opposite to the concave surface and thence over the distal edge of the lip and onto the concave surface of the lip. Such a strip is known from EP-A-0 390 568. In this strip, the textile covering over the distal edge of the lip extends for a short distance, only, onto the concave surface of the lip where it is adhesively secured to the lip. A disadvantage of such known form of strip is that, under enhanced temperature conditions, the textile covering has a tendency to cause the lip to tend to straighten, producing an unsightly appearance. The invention aims to overcome this problem. Another strip is known from EP-A-0 391 763. In this case, one longitudinal edge of the covering is stitched to the underside of the lip, and the covering then extends over the convex surface of the lip and over the strip body of the channel-shape and also over a sealing portion attached to an opposite outside surface of the channel, the opposite longitudinal edge being tucked up inside the channel. This known form of strip is therefore not concerned with the problem underlying the invention. According to the invention, therefore, such a strip as that of the type disclosed in EP-A-0 390 568 is characterised in that the textile covering extends over the whole of the concave surface of the lip to another terminating edge positioned beyond the radius where the lip meets the outside surface of the strip body adjacent the supporting edge and onto the adjacent said convex surface of the strip body, whereby any shrinkage tendency in the textile covering on the convex surface of the lip under conditions of enhanced temperature which tends to straighten the lip is offset by a similar shrinkage tendency of the textile covering on the concave surface of the lip, thereby substantially preventing the flexible covering from causing straightening of the lip under the conditions of enhanced temperature. Further developments in line with claim 1 are referred to in the dependent claims 1 to 5. 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 channel-shape 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. 90°C). 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. 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: A channel-shaped sealing, trimming and finishing strip for embracingly gripping a supporting edge (16), comprising a strip body (10) of channel-shape, a lip (14) running longitudinally along an outside surface of the strip body (10) at a position spaced from the channel mouth and extending away from the channel in a sideways direction from that outside surface and curved over at least partially in a re-entrant manner to define a partially concave surface (34) for embracingly receiving a longitudinal edge of a panel-like member (38), and a superimposed textile covering (40) having a terminating edge (40a) which is closely adjacent a sealing portion (12) and from that edge (40a) the covering (40) extends over a convex surface (36) of the lip (14) opposite to the concave surface (34) and thence over the distal edge of the lip (14) and onto the concave surface (34) of the lip (14), characterised in that the textile covering (40) extends over the whole of the concave surface (34) of the lip (14) to another terminating edge (40b) positioned beyond the radius where the lip (14) meets the outside surface of the strip body (10) adjacent the supporting edge (16) and onto the adjacent said convex surface (36) of the strip body (10), whereby any shrinkage tendency in the textile covering (40) on the convex surface (36) of the lip (14) under conditions of enhanced temperature which tends to straighten the lip is offset by a similar shrinkage tendency of the textile covering (40) on the concave surface (34) of the lip, thereby substantially preventing the flexible covering (40) from causing straightening of the lip (14) under the conditions of enhanced temperature. A strip according to claim 1, characterised in that the lip (14) extends sideways from the base of the channel. A strip according to claim 1 or 2, characterised in that the sealing portion (12) extends longitudinally along the outside of the channel on the opposite wall thereof to the said lip (14). A strip according to any preceding claim, characterised in that the strip body (10) is made of extruded plastics or rubber or other similar flexible material (22). A strip according to any preceding claim, characterised by an embedded reinforcing carrier (28) within the strip body (10).

Inventors: GATZMANGA ECKARD, GATZMANGA, ECKARD
Applicants: GENCORP PROPERTY INC, GENCORP PROPERTY INC.
Application year: 1997
Main classification: B60J10
IPC codes: B60J10