| 摘要 |
The invention relates to a method of and devices for cutting a channel in a layer of ice covering the surface of an expanse of water, said method utilizing a rotary cutting device actuated from an independent source of power, the cutting force being directed in a substantially horizontal plane and being applied over a limited ice-cutting front. The broken pieces of ice are given a lateral vertical direction, upwards or downwards, and are ejected outside the edges of the cut channel. The rotary cutting device comprises two sets of spiral-blade cutters with inserted knives, one set on each side of the longitudinal axis, the cutters of each set rotating in opposite direction. An ice-breaker ship incorporating the invention has conveyor means for transferring the cut ice away from the channel, auxiliary screws on each side of the front portion and auxiliary devices at the sides of the stern for varying the direction of the cut channel.
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