Patent ID: 8678304

Claim:
A method of activating a mountable hydraulic appliance for the shearing or crushing of structures for demolition, comminution or recycling, which has an upper jaw and a lower jaw at least one of which is pivotally hinged on a bearing axis arranged on the housing, wherein the hinged jaw is activated by a first hydraulic cylinder acting on a first acting point of the hinged jaw and by at least one further hydraulic cylinder acting thereon so as to be moved from an open position to a cutting position and/or a closed position and vice versa, both the first and the at least one further hydraulic cylinders acting on the hinged jaw using lever arms for force introduction which differ from each other, and a closing movement of the at least one hinged jaw is such that initially only the one of the hydraulic cylinders is activated which in a first closing phase has a higher closing speed and/or a greater lever arm than the at least one further hydraulic cylinder and that in an ulterior phase of the closing movement, in which an increase in required compression force takes place, the at least one further hydraulic cylinder is additionally activated, such that at that point in time during the closing movement an increased closing force is generated.