Joint construction, particularly for tripod stands

Claim 1

A JOINT CONSTRUCTION COMPRISING THREE ELONGATED SUPPORT MEMBERS HAVING END PORTIONS SUPPORTED FOR ANGULAR MOVEMENT ABOUT A CENTER BETWEEN A FIRST TERMINAL POSITION DEFINING A SMALLER ANGLE, AN INTERMEDIATE POSITION, AND A SECOND TERMINAL POSITION DEFINING AN ANGLE GREATER THAN SAID SMALLER ANGLE, WITH EACH OTHER, SAID END PORTIONS HAVING OUTWARDLY FACING PORTIONS FORMED WITH GROOVES AND LOCATED IN SAID FIRST TERMINAL POSITION ON ONE SIDE OF SAID CENTER AND IN SAID SECOND TERMINAL POSITION ON THE OTHER SIDE OF SAID CENTER, AND IN SAID INTERMEDIATE POSITION IN A COMMON PLANE WITH SAID CENTER AND SPACED FARTHER FROM EACH OTHER THAN IN SAID TERMINAL POSITIONS SO THAT SAID OUTWARDLY FACING PORTIONS MOVE APART DURING TURNING MOVEMENT OF SAID MEMBERS FROM ANY ONE OF SAID TERMINAL POSITIONS TO SAID INTERMEDIATE POSITION AND MOVE TOWARD EACH OTHER DURIONG TURNING MOVEMENT OF SAID MEMBERS FROM SAID INTERMEDIATE POSITION TO ANY ONE OF SAID TERMINAL POSITIONS, SAID END PORTIONS OF SAID SUPPORT TERMINAL POSITION THAN IN TO EACH OTHER IN SAID SECOND TERMINAL POSITION THAN IN SAID FIRST TERMINAL POSITION; AND A HEAD MEMBER HAVING A PLURALITY OF PRETENSIONED RESILIENT FINGERS RESPECTIVELY ENGAGING SAID GROOVES OF SAID OUTER SURFACE PORTIONS FOR URGING SAID OUTER SURFACE PORTIONS TOWARD EACH OTHER SO AS TO MOVE SAID MEMBERS SIMULTANEOUSLY TO ONE OR THE OTHER OF SAID TERMINAL POSITIONS WHEN ANY ONE MEMBER IS MOVED BEYOND SAID INTERMEDIATE POSITION, AND TO HOLD SAID MEMBERS IN EITHER TERMINAL POSITION, SAID HEAD MEMBER ENVELOPING AT LEAST PARTLY SAID END PORTIONS OF SAID ELONGATED SUPPORT MEMBERS AND BEING ADAPTED TO SUPPORT AN OBJECT WHEN SAID ELONGATED SUPPORT MEMBERS IN SAID SECOND TERMINAL POSITION REST ON THE OTHER END PORTIONS THEREOF.