Process for producing exterior member/seal member assembly

Abstract

A process for producing an exterior member/seal member assembly includes: a first step of moving a slide core to protrude into a major cavity defined between first and second dies and, and injecting a hard synthetic resin into an exterior-member forming cavity partitioned in the major cavity; and a second step of retracting the slide core and injecting a soft synthetic resin into a seal-member forming cavity which is a remaining portion of the major cavity. An outer-seal-lip forming portion is connected to an outer end of the seal-member forming cavity; a recess-shaped step is formed on one side face of the slide core and adapted to define an inner-seal-lip forming portion leading to the seal-member forming cavity between the step and an inner surface of a guide bore in the second die when the slide core is retracted; and the soft synthetic resin is filled into the outer and inner-seal-lip forming portions 15 and 16 at the second step. Thus, the seal member having the pair of inner and outer seal lips can be formed and coupled to the exterior member by one stroke of the seal-member forming step, and complication of the forming step can be avoided.

What is claimed is:  
     
         1 . A process for producing an exterior member/seal member assembly comprising an exterior member made of a hard synthetic resin and a seal member made of a soft synthetic resin and coupled to one end of said exterior member, said process comprising: 
 a first step of moving a slide core slidably mounted in a guide bore in a second die so that it protrudes into a major cavity defined between a first die and the second die, and injecting a hard synthetic resin into an exterior-member forming cavity partitioned in the major cavity to form an exterior member; and    a second step of retracting the slide core out of the major cavity and injecting a soft synthetic resin into a seal-member forming cavity, which is a remaining portion of the major cavity, to form a seal member,    wherein an outer-seal-lip forming portion is connected to an outer end of the seal-member forming cavity to protrude toward the second die; a recess-shaped step is formed on one side face of the slide core and adapted to define an inner-seal-lip forming portion leading to the seal-member forming cavity between said step and an inner surface of the guide bore in the second die when the slide core is retracted; and the soft synthetic resin is filled into the outer and inner-seal-lip forming portions at the second step.    
     
     
         2 . A process for producing an exterior member/seal member assembly according to  claim 1 , wherein said recess-shaped step is adapted to face the exterior-member forming cavity when the slide core is moved to protrude into the major cavity.  
     
     
         3 . A process for producing an exterior member/seal member assembly according to  claim 1 , wherein a cowl top to be secured to a vehicle frame at a lower portion of a rear end of an engine bonnet of an automobile is formed as said exterior member at said first step, and said seal member to be coupled to a rear end of the cowl top is formed at said second step.