EMPLOYEE OPERATING BREAKER WITH JAW, CRUSHING BIG AND HEAVY PIECES OF BLACKTOP, PIECES BECAME ENTANGLED, USED WEDGE AND CHAIN AND HANDLE AT OTHER END OF CHAIN. BOTH HANDS ON WEDGE HANDLE, AS L OWERING IT UNDER THE ENTANGLED PIECES TO KNOCK THEM LOOSE. WHEN ALL OF A SUDDEN THE ENTANGLED PIECES LET LOOSE AND FELL ON THE WEDGE, KNOCKING IT OUT CAUSING INJURY TO SHOULDER.