Tractor equipped with hoisting implement

Claim 1

IN COMBINATION WITH A TRACTOR, A LIFTING UNIT CONNECTED WITH SAID TRACTOR AND HAVING PIVOTS, A PAIR OF ARMS SWINGABLY MOUNTED UPON SAID PIVOTS, AND LOCKING DEVICES CARRIED BY SAID ARMS ADJACENT SAID PIVOTS, A LOADING IMPLEMENT, TWO ARMS CARRIED BY SAID LOADING IMPLEMENT AND LOCKING DEVICES CARRIED BY THE SECOND-MEMTIONED ARMS, THE FIRST-MENTIONED ARMS BEING ADPATED UPON MOVEMENT OF THE TRACTOR TOWARD SAID IMPLEMENT TO ENGAGE AND GUIDE THE SECOND-MENTIONED ARMS, TO PROVIDE OPERTIVE CONTACT BETWEEN THE FIRST-MENTIONED LOCKING DEVICES AND THE SECOND-MENTIONED LOCKING DEVICES AND TO MOVE SAID LOCKING DEVICES INTO LOCKING POSITIONS, THEREBY REMOVABLY COUPLING THE LOADING IMPLEMENT WITH THE LIFTING UNIT, MANUALLY OPERABLE MEANS UNLOCKING SAID LOCKING DEVICES FOR DETACHING SAID LOADING IMPLEMENT FROM SAID LIFTING UNIT WHEN THE TRACTOR IS MOVED IN THE OPPOSITE DIRECTION, AND MANUALLY OPERABLE LOCKING ELEMENTS REMOVABLY CONNECTING THE LIFTING UNIT TO THE TRACTOR, WHEREIN SAID LOCKING ELEMENTS COMPRISE A SEMICIRCULAR GUIDE MEMBER OF T-SHAPED AXIAL CROSS SECTION, A ROTARY MEMBER HAVING AN ABUTMENT ADAPTED TO ENGAGE SAID GUIDE, A HANDLE CONNECTED WITH SAID ROTARY MEMBER FOR ROTATING SAID ROTARY MEMBER, ONE OF SAID MEMBERS BEING MOUNTED ON THE TRACTOR AND THE OTHER ONE OF SAID MEMBERS BEING MOUNTED ON THE LIFTING UNIT.