Portable projection screen assembly

Claim 1

FOR USE IN A PORTABLE PROJECTION SCREEN ASSEMBLY INCLUDING A SUPPORTING COLUMN, A SCREEN HOUSING SUPPORTED ON SAID COLUMN FOR MOVEMENT BETWEEN STORAGE AND USE POSITIONS, AND STAND MEANS INCLUDING A PLURALITY OF LEGS MOVABLY CARRIED ON SAID COLUMN FOR MOVEMENT BETWEEN EXTENDED COLUMN-SUPPORTING POSITION AND RETRACTED STORAGE POSITION; IMPROVED MEANS FOR AUTOMATICALLY RETRACTING THE LEGS FROM EXTENDED COLUMN-SUPPORTING POSITION ON A SUPPORTING SURFACE TO RETRACTED STORAGE POSITION, SAID RETRACTING MEANS COMPRISING BIASEDK PLUNGER MEANS MOVABLE OUTWARDLY FROM SAID COLUMN FOR URGING SAID LEGS TO RETRACTED POSITION, SAID BIASED PLUNGER MEANS COMPRISING A COIL SPRING IN SAID COLUMN AND A PLUNGER ENGAGING SAID SPRING AT ONE END AND HAVING THE OTHER END EXTENDING OUTWARDLY FROM SAID COLUMN, A FOOT MEMBER ON SAID PLUNGER MOVABLE INTO A POSITION IN ALIGNMENT WITH SAID PLUNGER FOR ENGAGEMENT WITH SAID SUPPORTING SURFACE FOR MOVING SAID PLUNGER MEANS INWARDLY INTO SAID COLUMN TO COMPRESS SAID SPRING, LATCH MEANS FOR HOLDING SAID PLUNGER TO MAINTAIN SAID SPRING COMPRESSED AND TO PERMIT EXTENSION OF SAID LEGS, SAID FOOT MEMBER BEING MOVABLE OUT OF ALIGNMENT WITH SAID PLUNGER TO PERMIT THE LEGS TO SUPPORT SAID COLUMN ON SAID SUPPORTING SURFACE, AND LATCH RELEASE MEANS ON SAID COLUMN ENGAGED BY SAID SCREEN HOUSING IN RESPONSE TO MOVEMENT OF SAID SCREEN HOUSING FROM STORAGE TO USE POSITION TO RELEAST SAID LATCH MEANS FROM SAID PLUNGER, WHEREBY WHEN THE SCREEN ASSEMBLY IS RAISED FROM THE SUPPORTING SURFACE THE LEGS ARE AUTOMATICALLY RETRACTED.