Ice-breaking system

Claim 1

AN ICE-BREAKER COMPRISING, IN COMBINATION, A SHIP, AT LEAST TWO SUPERPOSED ROTARY DRUMS MOUNTED TRANSVERSELY OF SAID SHIP AT THE FRONT THEREOF, POWER MEANS TO DRIVE SAID DRUMS IN OPPOSITE DIRECTIONS OF ROTATION, THE LOWER ONE OF SAID DRUMS BEING ARRANGED BELOW THE WATERLINE OF SAID SHIP AND THE UPPER ONE OF SAID DRUMS BEING ARRANGED ABOVE SAID WATERLINE, SO THAT SAID TWO DRUMS WILL ENGAGE THE BOTTOM AND TOP SURFACE OF AN ICE COVER ON A BODY OF WATER AND CRUSH THE SAME, AND ICE- AND SNOW-THROWING MEANS ARRANGED WITHIN SAID SHIP BEHIND THE ROTARY DRUMS AND LOCATED ABOVE THE WATERLINE OF THE SHIP, POWER MEANS TO ACTUATE SAID THROWING MEANS, SAID THROWING MEANS HAVING A DISCHARGE DUCT DIRECTED TRANSVERSELY OF THE SHIP FOR THROWING THE ICE AND SNOW LATERALLY THEREOF AWAY FROM THE CHANNEL BEING CLEARED BY SAID ICE-BREAKER, AND REARWARDLY UPWARDLY INCLINED GRATE MEANS EXTENDING FROM BEHIND THE NIP OF SAID DRUMS TO SAID THROWING MEANS, ITS FORWARD END BEING BELOW SAID WATERLINE AND ITS REARWARD END ABOVE SAID WATERLINE, WHEREBY CRUSHED ICE AND SNOW MOVING REARWARDLY OVER SAID GRATE, WILL BE DRAINED OF EXCESS WATER BEFORE BEING ENGAGED BY SAID THROWING MEANS.