separate pieces fig2 illustrates one specific configuration of the system 10 wherein a single hydraulic cylinder 45 is used to pivot the interrupt bar 55 while fig3 9c illustrate a configuration wherein a pair of cylinders 45 are used the cylinders 45 are illustrated as positioned in the interior of the bucket 50 but may likewise be positioned adjacent the exterior of the bucket 50 fig1 12b illustrate a variation of the bucket 50 illustrated in fig2 and discussed above wherein the interrupt bar 55 and piston cylinder actuator 45 are enclosed in a recess 200 formed in the bucket 50 in this embodiment the recess 200 is defined by inner bucket wall 205 and outer bucket wall 201 which create the double walled bottom portion or recess 200 the actuator 45 is positioned in the recess 200 and is fixedly mounted to the bucket 50 at one end and to the interrupt bar 55 at the other energization of the actuator 45 advances the interrupt bar 55 out of the recess 200 to a position adjacent the cutting edge 53 where it is interposed between the bucket 50 and the ground bottom wall 210 acts to protect the actuator 45 from clogging by dirt.