A plastic zipper slider having hinged wings is provided with an improved latch tongue which is deflected downward to snap in place. Additional flexible latch web structure cooperates with the latch tongue to provide additional forces which are active in assuring that the wings are fully latched and to...http://www.google.com.tw/patents/US5448808?utm_source=gb-gplus-share專利 US5448808 - Foldable zipper slider with improved compression-type latch
