Adjustable column support

Claim 1

AN ADJUSTABLE LEG ASSEMBLY IN A JUMBO DRILL APPARATUS OF THE CHHARACTER DESCRIBED INCLUDING A ROCK DRILL LOADABLE ELONGATED COLUMN AND A PLURALITY OF LEG MEANS SUPPORTING THE COLUMN INN ERECT POSITION, EACH LEG MEANS COMPRISING A LEG MEMBER PIVOTABLE FROM A POSITION ANGULARLY DISPOSED RELATIVE TO THE COLUMN TO A DEPENDING VERTICAL POSITION ADJACENT THE COLUMN, A BRACKET PIVOTALLY SUPPORTING AN UPPER END OF THE LEG TO THE COLUMN, AND A BRACE DISPOSED AT RIGHT ANGLES TO THE LOWER END OF THE COLUMN HAVING ONE END PIVOTED TO THE LEG AND ITS OPPOSITE END DETACHABLY SUPPORTED TO THE COLUMMN; WHEREINN THE BRACKET IS CHARACTERIZED BBY A PAIR OF PARALLEL PLATES EXTENDING RADIALLY FROM THE COLUMN, A PIVOT PIN SUPPORTED BETWEEN TTHE PLATES, AND A THICK BLOCK PIECCE HAVING A REAR WALL FIXED IN PARALLEL ABUTMENT WITH THE COLUMN AND HAVING AN UNDERSURFACE INCLINED UPWARD ABOVE THE PIVOT PIN; AND WHEREIN THE UPPER END OF THE LEG IS PIVOTED ON THE PIVOT PIN BETWEEN THE PLATES AND IS CHARACTERIZED BY A FLAT END SURFACE FORMED AT RIGHT ANGLES TO TH ELONGITUDINAL AXIS OF THE LELG AND ADAPTED TO ABUT FLUSH WITH THE LEG MEMBER FROM A VERTICAL POSITION OUTWARDLY TO THE LEG MEMBEER FROM A VERRTICAL POSITION OUTWARDLY TO THE SAID ANGULARLY PIVOTED POSITTION, SO THAT TE LOAD OF THE COLUMN IS TRANSMITTED THROUGH THE BLOCK PIECE AND THE FLAT END SURFACE OVER SUBSTANTIALLY THEE ENTIRE CROSS AREA OF THE LEG, AND TTHE PIVOT PIN IS FREE OF SUCH LOAD.