Lifting device

Claim 1

A LIFTING DEVICE COMPRISING, IN COMBINATION, FIRST FRAME MEANS; SECOND ADJUSTABLE FRAME MEANS EXTENDING SUBSTANTIALLY PARALLEL TO SAID FIRST FRAME MEANS AND ADAPTED TO RECEIVE A LOAD; A PAIR OF SUBSTANTIALLY PARALLEL ARM MEANS RESPECTIVELY PIVOTALLY CONNECTED AT OPPOSITE ENDS THEREOF TO LONGITUDINALLY SPACED PORTIONS OF SAID FIRST AND SECOND FRAME MEANS AND BEING TILTABLE FROM A REST POSITION EXTENDING SUBSTANTIALLY PARALLEL TO SAID FRAME MEANS TO A RAISED POSITION INCLINED TO SAID FRAME MEANS; SUPPORT MEANS FIXED TO AND PROJECTING UPWARDLY FROM ONE OF SAID ARM MEANS AND HAVING A FREE END ABOVE SAID ONE ARM MEANS; TELESCOPING MOVING MEANS INCLUDING A FIRST TELESCOPING MEANS AND A SECOND TELESCOPING MEANS MOVABLE WITH RESPECT TO EACH OTHER BETWEEN A COLLAPSED AND AN EXTENDED POSITION, ONE OF SAID TELESCOPING MEANS BEING CONNECTED AT ONE END THEREOF TO SAID FREE END OF SAID SUPPORT MEANS FOR PIVOTAL MOVEMENT ABOUT AN AXIS AND THE OTHER OF SAID TELESCOPING MEANS BEING PIVOTALLY CONNECTED AT ONE END THEREOF TO A PORTION OF SAID FIRST FRAME MEANS WHICH IS, WHEN SAID ARM MEANS ARE IN SAID REST POSITION AND SAID TELESCOPING MOVING MEANS IN SAID COLLAPSED POSITION, LOCATED IN A PLANE PASSING SUBSTANTIALLY NORMAL TO SAID ARM MEANS THROUGH SAID AXIS; AND MEANS COOPERATING WITH SAID TELESCOPING MOVING MEANS FOR MOVING THE LATTER FROM SAID COLLAPSED TO SAID EXTENDED POSITION TO TILT SAID ARM MEANS FROM SAID REST TO SAID RAISED POSITION SO AS TO RAISE SAID SECOND FRAME MEANS AND A LOAD RECEIVED THEREBY WITH RESPECT TO SAID FIRST FRAME MEANS, WHEREBY DUE TO THE PIVOT ARRANGEMENT OF SAID TELESCOPING MOVING MEANS A RELATIVELY SMALL FORCE IS REQUIRED TO RAISE SAID SECOND FRAME MEANS.