I need help with a movie title. This is an old movie from maybe the mid to late 1970's or even early 1980's. It is about 2 couples driving home from either a play, movie or a conert in the city. On their way home they make a wrong turn off the highway and end up in inner city. The end up helping a gang member in which a whole gang ends up chasing them. The gang member leads them into this closed down factory, where the fight off the entire gang by making weapons out of whatever they would find in the factory. That is about all I can remember of this movie. I don't believe that there a any well known actors in this movie. For some reason the I think the title has "chains" in the title. I could be wront though. This is not the same movie that Emelio Estavez is in. Please help me with this movie. I have wanted to see this movie again for about 10 years. HELP!