Automobile Weather Strip
Weather strip includes an attaching base portion
, and a hollow seal portion. The attaching base portion has a generally L-shaped cross-section, and includes a bottom wall and an exterior side wall. An elongation/shrinkage prevention portion is formed such that when the attaching base portion is curved in a direction of a width of the exterior side wall, a neutral axis of curvature is disposed at a position slightly offset toward a widthwise distal end of the exterior side wall from that portion of the exterior side wall of an interior surface of the exterior side wall extending toward the distal end of the exterior side wall from a region at which a first hollow connecting portion of the hollow seal portion and the exterior side wall are interconnected.continuous with the bottom wall. A double adhesive tape is bonded at least to that portionA weather strip for sealing between a opening/closing member of a vehicle and a peripheral part of a vehicle body opening of the vehicle, comprising: an attaching baseportion adapted to be attached to a flange formed at one of the opening/closing member and the peripheral part; and a hollow seal portion formed integrally with the attaching base portion and adapted to contact against the other of the opening/closingmember and the peripheral part to seal between the opening/closing member and the peripheral part; the attaching base portion includes at least a bottom wall and an exterior side wall to define a generally L-shaped cross section;
Wherein anelongation/shrinkage prevention portion is formed in the exterior side wall such that a neutral plane of curvature when the attaching base portion is curved in a widthwise direction thereof is located at a position closer to a widthwise distal end of theexterior side wall than an interconnecting portion between the exterior side wall and the bottom wall; the hollow seal portion includes a sealing contact portion for contacting with the other of the opening/closing member and the peripheral part, afirst hollow connecting portion interconnecting one side end of the sealing contact portion and an exterior surface of the exterior side wall located at a position closer to the widthwise distal end of the exterior side wall than the elongation/shrinkageprevention portion, and a second hollow connecting portion interconnecting another side end of the sealing contact portion and the exterior surface of the exterior side wall located at a root portion of the exterior side wall; and a double adhesive tapeis bonded at least to a region on an interior side surface of the exterior side wall defined between a widthwise distal end of the exterior side wall and a portion at which the first hollow connecting portion and the exterior side wall areinterconnected.
The door weather strip 160 attached to the outer periphery of the door 2 includes an attaching base portion 161, as well as a hollow seal portion 164 and a seal lip portion 166 which are formed integrally on the attaching base portion 161. Theattaching base portion 161 is fitted into the retainer 4 formed at the outer periphery of the door frame, and is thus mounted to the door frame. When the door 2 is closed, the seal lip portion 166 contact with a most exterior side end of the peripheralpart 6 to seal a gap between the distal end of the door frame and the exterior side end of the peripheral part 6. At this time, the hollow seal portion 164 contact with a bulge portion of the peripheral part 6 disposed on the interior side of theportion of the peripheral part 6 with which the seal lip portion 166 contacts, thereby sealing between the door 2 and the peripheral part 6.
The opening trim weather strip 110 is attached to the flange 7 formed at the opening portion in the vehicle body, and contact with the door frame, etc. to seal between the door 2 and the peripheral part 6, at a region disposed on the interiorside of the region where the weather strip 160 contact with the peripheral part 6 for sealing. Namely, the opening trim weather strip 110 is attached to the flange 7 through its attaching base portion 120 of a generally U-shaped cross-section, and itshollow seal portion 130 contact with a bulge portion 2a, etc., of the door frame to seal between the flange 7 and the door 2. A core member 124 such as a metal insert for holding the flange 7 is embedded in the attaching base portion 120, and flangeholding lips are formed within the attaching base portion 120.
However, this opening trim weather strip 110 has an increased weight since it has the metal insert or the like, and further this weather strip 110 is formed into such a shape that the flange 7 is inserted into the attaching base portion 120, andtherefore a force is required for deforming the flange holding lips, and much time and labor have been required for attaching this opening trim weather strip 110 to the flange 7.
Furthermore, in the case where the opening trim weather strip is attached to the peripheral part 6 of the vehicle body opening which is a vehicle body opening for a side door over the entire periphery thereof, the flange 7 formed at theperipheral part 6 varies in thickness from one region to another, that is, not uniform in thickness over the entire periphery. Namely, the flange 7 is formed by joining distal end portions of a plurality of panels forming the vehicle body, and thenumber of the panels joined varies from 2 to 5, depending on the region, so that the thickness of the flange varies from about 1.4 mm to about 8 mm.
Therefore, in the case where the core member 24 for reinforcing purposes such as a metal insert is embedded in the attaching base portion 120 of a generally U-shaped cross-section, a force required for fitting the attaching base portion 120 onthe flange 7 has increased depending on the region, and also a holding force for the flange 7 has decreased depending on the region. Therefore, attempts have been made to obtain the optimum hardness and shape of the holding lips formed within theattaching base portion 120, but this has been found not entirely satisfactory. Further, the opening trim weather strip 110 increases in weight with the use of the metal insert or the like as described above, and therefore can not meet a demand for alightweight design of the vehicle.
Therefore, as shown in FIG. 6, there has been proposed a weather strip in which any core member such as a metal insert is not provided in an attaching base portion (trim portion) 220, thereby enhancing its lightweight design and flexibility, andalso the weather strip is attached to a flange 7 by the use of a double adhesive tape 225 (see, for example, JP-A-5-338567 Publication and JP-A-2000-335460 Publication). In this case, as shown in FIG. 6, the double adhesive tape 225 is bonded to aninner surface of an exterior side wall 222 of the trim portion 220 of the weather strip 210, and a distal end portion of the flange 7 is inserted in an inclined condition into the interior of the trim portion 220, and the trim portion 220 is rotated orangularly moved about the distal end of the flange 7, so that the double adhesive tape 225 is pressed to be bonded to an exterior side surface of the flange 7.
In this case, one of the two side walls of the trim portion 220 is formed into a shorter size so that the distal end of the flange 7 can be easily inserted into an inner part of the trim portion 220. The double adhesive tape 225 is bonded to thelonger side wall, and the distal end of the flange 7 is inserted into the inner part of the trim portion 220 while the trim portion 220 is kept in an inclined condition, and then the trim portion 220 is angularly moved in a direction of an arrow, therebybonding the double adhesive tape 225 to the side surface of the flange 7, and attaching the weather strip 210 to the flange. More specifically, when the weather strip 210 is to be bonded to the flange 7 by the double adhesive tape 225, a protective tapeis peeled off the double adhesive tape 225, and in an inclined condition of the trim portion 220, the distal end of the flange 7 is inserted into the trim portion 220 without contacting an adhesive surface of the double adhesive tape 225, and the trimportion 220 is angularly moved about the distal end of the flange 7, so that the double adhesive tape 225 is pressed to be bonded to the side surface of the flange 7.
This weather strip 210 is designed such that the distal end of the flange 7 is inserted into the trim portion 220, and then the trim portion 220 is angularly moved so as to attach the weather strip 210 to the flange, and therefore even in thisweather strip 210, the above insertion and angular movement can not often be properly effected in the case where the plate thickness of the flange 7 varies.
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