Parallel bar gymnastic apparatus

Claim 1

IN PARALLEL BAR GYMNASTIC APPARATUS, THE COMBINATION OF A SUPPORTING BASE OF GENERALLY RECTANGULAR CONFIGURATION ADAPTED TO REST ON A HORIZONTAL SUPPORTING SURFACE AND HAVING ELONGATED STABLIZING SECTIONS EXTENDING DIAGONALLY AND OUTWARDLY FROM THE CORNERS OF THE RECTANGULAR, FOUR HOLLOW TUBULAR VERTICAL POSTS UPSTANDING RIGIDLY FROM SAID FOUR CORNERS OF SAID BASE, FOUR CYLINDRICAL PISTONS TELESCOPING WITHIN AND GUIDED FOR VERTICAL ADJUSTMENT RELATIVE TO SAID POSTS, PARALLEL BARS EACH EXTENDING HORIZONTALLY ACROSS AND MOUNTED ON THE TOPS OF A DIFFERENT PAIR OF SAID PISTONS, RELEASABLY CLAMPS ON SAID POSTS FOR HOLDING SAID PISTONS IN DIFFERENT SELECTED POSITIONS OF ADJUSTMENT, AND AN ADAPTER ASSEMBLY FOR CONVERTING THE APPARATUS FOR USE AS UNEVEN PARALLEL BARS, SAID ASSEMBLY COMPRISING TWO BASE EXTENSIONS SECURED TO THE OUTER ENDS OF TWO OF SAID STABILIZING SECTIONS ON ONE SIDE OF SAID BASE AND EXTENDING THE EFFECTIVE LENGTH OF SUCH SECTIONS, RIGID ELONGATED DIAGONAL BRACE MEMBERS HAVING THEIR LOWER ENDS CONNECTED TO SAID EXTENSIONS AND THEIR UPPER ENDS RELEASABLY CLAMPED TO THE UPPER END PORTIONS OF THE PISTONS ADJACENT TO THE EXTENSIONS, A PAIR OF PISTON EXTENSIONS OF THE SAME EXTERIOR CONFIGURATION AS SAID TWO ADJACENT PISTONS, SAID PISTON EXTENSIONS BEING SECURED IN ABUTTING RELATIONSHIP TO THE LOWER END OF SAID ADJACENT PISTONS SO AS TO EXTEND THE LENGTHS OF SUCH PISTONS AND POSITION THE ASSOCIATED PARALLEL BAR AT A HEIGHT SUBSTANTIALLY GREATER THAN THE HEIGHT OF THE OTHER PARALLEL BAR.