An easily releasable locking device includes upper and lower assemblies of latch and cavity members adapted to be disposed between a right lateral wall of a battery pack and a right inner side wall of a bottom wall of a portable battery-powered apparatus respectively, and aligned with each other and...http://www.google.de/patents/US6371535?utm_source=gb-gplus-sharePatent US6371535 - Easily releasable locking device for detachably securing a battery pack to a portable battery-powered apparatus
