Multiple-purpose power shovel

Claim 1

A MULTIPLE PURPOSE POWER SHOVEL COMPRISING (A) A SELF-POWERED FRAME STRUCTURE; (B) A ROTARY PLATFORM; (C) A COMPOUND BOOM STRUCTURE INCLUDING (I) A MOUNTING LINK HAVING ONE END PIVOTED AT ONE POINT OF SAID PLATFORM, (II) A BOOM ARM HAVING ONE END PIVOTED ON SAID MOUNTING LINK AND A PLURALITY OF CONTROL PIVOTS POSITIONED INTERMEDIATE SAID ONE END AND THE OPPOSITE END OF SAID ARM, AND (III) A BOOM STRUCTURE CONTROL LINK HAVING ONE END PIVOTED ON SAID PLATFORM AT THE SAME POINT AS SAID ONE END OF SAID MOUNTING LINK AND AN OPPOSITE END PIVOTED TO ONE OF SAID CONTROL PIVOTS ON SAID BOOM ARM, THE MOUNTING LINK, THE BOOM ARM AND THE BOOM STRUCTURE CONTROL LINK DEFINING A TRIANGULAR COMPOUND BOOM STRUCTURE; (D) A FLUID ACTUATED CYLINDER FOR CONTROLLING SAID BOOM STRUCTURE, SAID FLUID ACTUATED CYLINDER HAVING ONE BEARING END PIVOTED ON SAID PLATFORM AND AN OPERATIVE END PIVOTED ON SAID BOOM STRUCTURE CONTROL LINK; (E) AN OPERATING ARM HAVING A PAIR OF BRANCH MEMBERS PIVOTED ON SAID OPPOSITE END OF THE BOOM ARM; (F) AN ARM CONTROL CYLINDER HAVING ONE BEARING END PIVOTED ON SAID BOOM ARM AND AN OPERATIVE END PIVOTED BETWEEN THE TWO BRANCH MEMBERS OF SAID OPERATING ARM; (G) A SHOVELLING BUCKET PIVOTALLY SUPPORTED BY SAID OPERATING ARM; AND (H) A BUCKET CONTROL CYLINDER DISPOSED BETWEEN SAID TWO BRANCH MEMBERS OF SAID OPERATING ARM AND HAVING A BEARING END PIVOTED BETWEEN SAID TWO BRANCH MEMBERS AND AN OPERATIVE END FOR ACTUATING SAID BUCKET.