Stand for portable movie screen

Claim 1

A PORTABLE STAND ADAPTED TO BE MAINTAINED IN AN UPRIGHT POSITION UPON A SUPPORTING SURFACE, COMPRISING: AN ELONGAGED STANDARD HAVING A LOWER END PORTION PROVIDED WITH A PLUNGER, THE PLUNGER BEING CONSTRUCTED AND ARRANGED TO MOVE UPWARDLY AND DOWNWARDLY WITH RESPECT TO SAID LOWER END PORTION AND BEING NORMALLY URGED IN AN UPWARD DIRECTION; A PAIR OF BRACKETS SPACED AXIALLY OF THE LOWER END OF THE STANDARD AND BEING MOUNTED FOR RELATIVE MOVEMENT AXIALLY OF THE STANDARD WITH RESPECT TO EACH OTHER; A LEG UNIT ON THE LOWER END OF TTHE STANDARD FOR SUPPORTING SAID STANDARD IN AN UPRIGHT POSITION, THE LEG UNIT HAVING A PLURALITY OF LEG MEMBERS SWINGABLE BETWEEN A CLOSED POSITION ADJACENT THE STANDARD AND AN OUTWARDLY SPREAD SUPPORTING POSITION, EACH LEG MEMBER BEING PROVIDED WITH A BRACING LINK AND BEING PIVOTALLY SECURED TO THE UPPER BRACKET, THE BRACING LINKS EACH BEING PIVOTALLY SECURED TO THE LOWER BRACKET AND TO ITS RESPECTIVE LEG MEMBER AT LEAST ONE BRACING LINK AND THE PLUNGER BEING POSITIONED TO COOPERATE WITH EACH OTHER TO MOVE THE BRACKETS AWAY FROM EACH OTHER AND TO FOLD THE LEG MEMBERS AND BRACING LINKS IN CLOSED POSITION ADJACENT TO THE STANDARD WHEN THE PLUNGER IS MOVED DOWNWARDLY WITH RESPECT TO THE LOWER END PORTION OF THE STANDARD; AND SPRING MEANS FOR EXERTING THRUST ON THHE PLUNGER TO MOVE THE PLUNGER DOWNWARDLY WHEN THE STAND IS REMOVED FROM THE SUPPORTING SURFACE THEREBY AUTOMATICALLY TO SWING THE LEG MEMBERS AND BRACING LINKS TO CLOSED POSITION, THE WEIGHT OF THE STAND MAINTAINING THE LEG UNIT IN SUPPORTING POSITION IN OPPOSITION TO THE SPRING MEANS WHEN THE LEG UNIT RESTS UPON THE SUPPORTING SURFACE.