US Patent 7000509 Hand tool with a removable rotary bit receiving cassette

A hand tool includes a handle defining an axially extending passage therein, and having an accommodation cavity with a radially extending access opening. A cassette member is insertable through the opening to be rotatably mounted in the cavity, and has a plurality of angularly displaced storage chambers for receiving tool bits, respectively, such that a selected one of the chambers is in line with the passage. A shank is movably disposed in the passage, and has an engaging head which can push the tool bit in the selected chamber outwardly of the handle for operation, and which can be retracted into the passage for angular movement of the chambers. The cassette member can be radially pushed to be removed from the cavity through the opening.