Wrecking truck

Claim 1

A LIFTING DEVICE COMPRISING IN COMBINATION: (A) A SUPPORT; (B) A BASE MEMBER MOUNTED ON SAID SUPPORT; (C) A MAIN ARM AND AN AUXILIARY ARM, SAID ARMS BEING ELONGATED AND EACH HAVING ONE LONGITUDINAL END PORTION PIVOTED TO SAID BASE MEMBER; (D) A SECONDARY ELONGATED ARM HAVING ONE LONGITUDINAL END PORTION HINGEDLY SECURED TO THE OTHER LONGITUDINAL END PORTION OF SAID MAIN ARM, SAID SECONDARY ARM HAVING A FREE END PORTION; (E) WORKING PLATFORM MEANS ON SAID FREE END PORTION; AND (F) A PLURALITY OF JACK MEANS INTERPOSED BETWEEN SAID BASE MEMBER AND SAID ARMS FOR ACTUATING MOVEMENT OF SAID PLATFORM MEANS BETWEEN A POSITION IN WHICH SAID PLATFORM MEANS IS ABOVE SAID SUPPORT, AND ANOTHER POSITION IN WHICH SAID PLATFORM MEANS IS BENEATH SAID SUPPORT, SAID PLURALITY OF JACK MEANS INCLUDING (1) FIRST JACK MEANS INTERPOSED BETWEEN SAID BASE MEMBER AND THE OTHER END PORTION OF SAID AUXILIARY ARM, (2) SECOND JACK MEANS INTERPOSED BETWEEN THE OTHER END PORTION OF SAID AUXILIARY ARM AND SAID OTHER END PORTION OF SAID MAIN ARM, AND (3) THIRD JACK MEANS INTERPOSED BETWEEN SAID OTHER END PORTION OF SAID MAIN ARM AND SAID FREE END PORTION OF SAID SECONDARY ARM FOR ACTUATING PIVOTAL MOVEMENT OF SAID ARMS RELATIVE TO EACH OTHER AND RELATIVE TO SAID BASE MEMBER, (4) AT LEAST ONE OF SAID FIRST AND SECOND JACK MEANS BEING ADAPTED TO PIVOT SAID AUXILIARY ARM THROUGH AN ANGLE SUBSTANTIALLY GREATER THAN 90 DEGREES.