A DOSE SETTING MECHANISM (4； 200) FOR A DRUG DELIVERY DEVICE IS DISCLOSED. THE MECHANISM COMPRISES AN OUTER HOUSING (40； 204) AND AN INNER HOUSING (208) HAVING AN EXTERNAL GROOVE (232). THE INNER HOUSING GUIDES A DRIVER (30； 209) TO DISPENSE A SET DOSE. A DIAL SLEEVE (10； 206) IS DISPOSED BETWEEN THE OUTER AND INNER HOUSING AND IS ROTATABLY ENGAGED WITH THE INNER HOUSING. WHEN A DOSE IS SET, THE DIAL SLEEVE IS ROTATED AND TRANSLATES AWAY FROM BOTH THE OUTER HOUSING (40； 204) AND THE INNER HOUSING (208). THE MOST ILLUSTRATIVE DRAWING ACCOMPANYING THE ABSTRACT: FIG. 6
