Apparatus and hoist means for construction

Claim 1

IN A HOISTING APPARATUS: A PAIR OF ELEVATOR UNITS EACH INCLUDING AN INTEGRATING MEANS FOR MOUNTING RIGIDLY ON A SITE AND EACH FORMING A HOISTING MEANS MORE SPECIFICALLY DEFINED AS HAVING A HYDRAULIC CYLINDER MEANS FIXED ON THE INTEGRATING MEANS AND A PISTON MEANS RECIPROCABLE IN SAID CYLINDER MEANS, AND A HANGER MEANS DEPENDENT FROM THE UPPER ENDS OF SAID PISTON MEANS AND ADAPTED TO BE ELEVATED THEREBY, AND A HOIST SADDLE MEANS FORMED ON THE NETHERMOST PART OF THE HANGER MEANS AND TO BE ELEVATED THEREBY; A HOIST BEAM MEMBER FOR LOCATING ON PART OF A SITE AND UNDER A LOAD UNIT, THE HOIST BEAM MEMBER BEING ENGAGEABLE AT ONE END BY A HOIST SADDLE MEANS OF ONE ELEVATOR UNIT AND BEING ENGAGEABLE AT THE OPPOSITE END BY A HOIST SADDLE MEANS OF THE OTHER ELEVATOR UNIT; AND MEANS TO PASS A FLUID INTO THE CYLINDERS OF SAID ELEVATOR UNITS FOR THRUST UPWARDLY OF SAID PISTON MEANS AND DEPENDENT HANGER MEANS AND HOIST SADDLE MEANS TO THEREBY ELEVATE SAID HOIST BEAM MEMBER AND THEREBY THE LOAD UNIT; EACH SAID ELEVATOR UNIT BEING FURTHER DEFINED AS HAVING HOLDING BRACKET MEANS FIXED RIGIDLY ON THE RELATIVELY IMMOVABLE CYLINDER MEANS OF EACH SAID ELEVATOR UNIT SUBSTANTIALLY NEAR THE UPPERMOST PART THEREOF, A RETENTION BEAM MEMBER ADAPTABLE TO BE LOCATED UNDER A PROJECTED CONSTRUCTION UNIT WHEN HOISTED TO A NEW LEVEL SUBSTANTIALLY THAT OF THE HOLDING BRACKET MEANS AND TO REST UPON SAID HOLDING BRACKET MEANS ON EACH SAID ELEVATOR UNIT AT ENDS OF THE RETENTION BEAM MEMBER, THE HOLDING BRACKET MEANS AND SAID RETENTION BEAM MEMBER BEING THEREBY EFFECTIVE TO RETAIN A FORMED CONSTRUCTION UNIT AT SAID LEVEL TO WHICH IT IS HOISTED.