Shielded aerosol medicament dispenser

Claim 1

AN AEROSOL SPRAY UNIT WHICH COMPRISES AN AEROSOL VESSEL HAVING A PRESSURE CHAMBER CONTAINING FLUID UNDER PRESSURE; A VALVE MEMBER YIELDABLY MOUNTED IN SAID VESSEL AND HAVING A PASSAGE NORMALLY NOT IN COMMUNICATION WITH THE PRESSURE CHAMBER, SAID VALVE MEMBER BEING AXIALLY DISPLACEABLE INWARDLY WITH RESPECT TO SAID VESSEL TO PLACE SAID PASSAGE IN COMMUNICATION WITH THE PRESSURE CHAMBER AND ALLOW FLUID TO BE EJECTED UNDER PRESSURE THROUGH SAID PASSAGE; AND A SPRAY HEAD COMPRISING A HOOD MOUNTED IN A FIXED AXIAL POSITION WITH RESPECT TO SAID VALVE MEMBER AND BEING ADAPTED FOR INWARD AXIAL MOVEMENT WITH RESPECT TO SAID VESSEL TO IMPART INWARD AXIAL MOVEMENT TO SAID VALVE MEMBER, SAID HOOD DEFINING A SPRAY OPENING SPACED AXIALLY OUTWARDLY OF SAID VALVE MEMBER AND SAID HOOD EXTENDING AXIALLY INWARDLY FROM THE OPENING BEYOND AND IN RADIALLY SPACED RELATION WITH SAID VALVE MEMBER; A PLURALITY OF ANGULARLY SPACED SUPPORTING WALLS EXTENDING RADIALLY BETWEEN SAID VALVE MEMBER AND SAID HOOD FOR SUPPORTING SAID HOOD RADIALLY OUTWARDLY OF SAID VALVE MEMBER; AND AN ANNULAR CAM SPACED RADIALLY INWARDLY OF SAID HOOD AROUND SAID VALVE MEMBER, SAID CAM BEING SHAPED AND POSITIONED WITH RESPECT TO SAID SUPPORTING WALLS TO CONTACT SAID SUPPORTING WALLS AND BLOCK THEIR INWARD AXIAL MOVEMENT IN ONE ROTATIVE POSITION OF SAID HOOD WITH RESPECT TO SAID VESSEL AND THEREBY PREVENT ACTUATION OF THE UNIT, AND TO PERMIT THE INWARD AXIAL MOVEMENT OF SAID WALLS AND SAID HOOD IN ANOTHER ROTATIVE POSITION OF SAID HOOD WITH RESPECT TO SAID VESSEL AND THEREBY PERMIT ACTUATION OF THE UNIT.