US Patent 7619387 Battery pack attachment arrangement

A battery pack attachment arrangement comprising a tool having a housing defining a hollow area and an opening into the hollow area. A first support track is defined within the housing hollow area. A battery pack includes a main body and a stem portion extending from the main body. A first key extends radially from the battery pack stem portion. The first key is configured to be received axially through a first keyway and thereafter rotated along the first support track from a first portion to a second portion such that the first key supports the battery pack relative to the housing.