Concrete pulverizer

A concrete pulverizer for breaking pieces of concrete, said pulverizer being adapted for mounting on an outer end of a dipper arm of a power excavator, said dipper arm having a hydraulic cylinder actuator mounted on a front side of the dipper arm, said concrete pulverizer comprising:

• a movable lower jaw forming a crushing upper surface on which a concrete piece can be received, having a front edge on which a set of teeth are mounted, and having a rearwardly extending, elongate arm rigidly connected to the lower jaw and adapted for orienting the lower jaw;
• a movable upper jaw having first pivot means for pivotably connecting a rear end section of the upper jaw to said outer end of the dipper arm, having means for crushing said concrete piece between said upper jaw and the upper surface of said lower jaw, and having second pivot means for pivotably connecting said upper jaw to said hydraulic cylinder actuator whereby said upper jaw can be pivoted from an upper open position to a closed position by said hydraulic cylinder actuator, said crushing means lying adjacent said crushing upper surface in said closed position;
• and
• hydraulic power means connectible to a rear end section of said rearwardly extending elongate arm in order to pivot said lower jaw to a plurality of desired operating positions,
• wherein during use of the pulverizer on a dipper arm, said lower jaw can be pivoted to a horizontally extending operating position in order to scoop up one or more concrete pieces to be crushed.

A concrete handling machine for picking up and breaking pieces of concrete, said machine comprising:

• a mobile construction machine adapted to carry a machine operator;
• an elongate boom structure mounted on said construction machine and tiltably extending therefrom to a front end of the boom;
• an elongate dipper arm pivotably connected to the front end of the boom structure, said dipper arm having a forward end;
• a first hydraulic cylinder actuator mounted on said boom for pivoting said dipper arm about a substantially horizontal first axis;
• an upper jaw having a rear end section pivotably connected to said forward end of the dipper arm, said upper jaw also having a front end;
• a first set of forwardly extending spaced-apart pickup teeth mounted on said front end of the upper jaw;
• a second hydraulic cylinder actuator mounted on the dipper arm for pivoting said upper jaw about a substantially horizontal second axis;
• a lower jaw having a rear portion pivotably connected to said rear end section of the upper jaw, forming a crushing surface on an upper side thereof on which a concrete piece can be received, and having a front edge;
• a second set of forwardly extending, spaced-apart pickup teeth mounted on said front edge of the lower jaw;
• and
• a third hydraulic cylinder actuator mounted on and connected to said dipper arm for pivoting said lower jaw about a substantially horizontal third axis between a horizontally extending concrete scooping position and a dumping position;
• wherein a first distance measured perpendicularly from said third axis to tips of the pickup teeth of the first set is approximately equal to a second distance measured perpendicularly from said third axis to tips of the pick-up teeth of the second set.

A concrete pulverizer for mounting on a movable arm of a power excavator, said arm having an extendible hydraulic cylinder actuator mounted on a front side of the arm, said pulverizer comprising:

• an upper jaw having a rear end section pivotably connectible to one end of said arm and having a front end, said upper jaw being adapted for connection to said hydraulic cylinder actuator for pivotal movement thereby;
• a first row of forwardly extending pickup teeth mounted on said front end of the upper jaw;
• a lower jaw having a rear portion connected to said rear end section of the upper jaw for pivotal movement about a primary pivot axis and forming a crushing surface on an upper side thereof on which a concrete piece can be received, said lower jaw having a front edge;
• a second row of forwardly extending pickup teeth mounted on said front edge;
• and
• an actuator mechanism adapted for mounting on said arm and for connection to said lower jaw, said actuator mechanism during use of said pulverizer being capable of pivoting said lower jaw about said primary pivot axis and between a horizontally extending concrete scooping position and a dumping position,
• wherein the two rows of pickup teeth are approximately the same perpendicular distance from said primary pivot axis and, during use of the pulverizer, the two jaws can be pivoted towards each other to a pickup position where front tips of the teeth in one of said rows are closely adjacent front tips of the teeth in the other of said rows.