Patent ID: 7430955

Claim:
A hydraulic arrangement for a tool locking device of a loader, comprising: a hydraulic cylinder having first and second chambers, and having a first position for unlocking and a second position for locking; a first supply line hydraulically connected to the first chamber; a second supply line hydraulically connected to the second chamber; and, a control valve located in said first supply line so as to be hydraulically connected to the first chamber, the control valve being movable between a first position, wherein hydraulic fluid can flow only in the direction of the first chamber for moving said hydraulic cylinder to said second position for locking, and a second position, wherein hydraulic fluid can flow both to the first chamber for effecting movement of the hydraulic cylinder to said second position for locking when said second supply line is devoid of operating pressure and out of the first chamber for permitting said hydraulic cylinder to move to said first position for unlocking only when fluid is supplied to said second chamber via said second supply line.