A weatherstrip (20) for use with a slideable panel unit having a first panel and second panel, one of the panels being a slideable panel is disclosed. The weatherstrip (20) includes an engaging member (21) having a leading edge (26a-c) and having a first end (21a), a center region (21b) and a second...http://www.google.es/patents/US4726147?utm_source=gb-gplus-sharePatente US4726147 - Slideable panel unit interlock
