Patent ID: 7735249

Claim:
Quick-change device ( 12 ), comprising: a quick changer ( 16 ) attached to a working machine; a tool ( 14 ); an interlocking mechanism; a hydraulic system on said working machine; an adapter ( 18 ) lockable to said quick changer ( 16 ), said adapter connected to a tool ( 14 ); a hydraulic coupling ( 20 ) for establishing a hydraulic connection between said hydraulic system present on said working machine and said hydraulic system of said tool ( 14 ); said hydraulic coupling ( 20 ) consists of a first coupling part ( 20 a ) and a second coupling part ( 20 b ), said coupling parts ( 20 a , 20 b ) being held in an operating position relative to each other; said first coupling part ( 20 a ) and said second coupling part ( 20 b ) cooperate with at least mechanical retaining means ( 68 , 78 , 80 ), said mechanical retaining means are separate from said interlocking mechanism; and, said coupling parts ( 20 a , 20 b ) are held together nonpositively in the operating position by the mechanical retaining means ( 68 , 78 , 80 ).