DUAL STAGE INFLATOR

A dual stage inflator a dual stage inflator for an inflatable vehicle safety device includes a housing defining a first chamber containing a first gas generant material. An ignitor cup is disposed in the first chamber and defines an interior containing an ignitor material. A first ignitor device extends into the interior of the ignitor cup. A combustion cup and a lid are disposed in the first chamber and cooperate to define a second chamber containing a second gas generant material. The combustion cup includes a cup sidewall extending between a first axial end and a second axial end. The first axial end is an open end. The lid is normally in a closed position relative to the combustion cup to close the open end of the combustion cup and is moveable away from the combustion cup in response to an increase of pressure within the combustion cup for venting combustion gas out of the combustion cup. A second ignitor device extends into the combustion cup and closes the second axial end of the combustion cup. The combustion cup includes a first axially extending portion adjacent the first axial end having a first outer diameter and a second axially extending portion adjacent the second axial end having a second outer diameter greater than the first outer diameter. The lid includes a lid sidewall extending in an axial direction and radially overlapping at least a portion of the combustion cup including the first outer diameter.