B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
114/11
B63B 35/12 (2006.01)
Patent
CA 1230784
ABSTRACT In an apparatus for breaking and clearing paths in ice co- vered waterways, it is known to have an upward thrusting, taper- ed plough blade, which is articulatable vertically in two places, at the elbow joint and at the mounting trunnions. In addition, a pair of lateral flexing, scoop-shaped wings or gates are app- ended to either side of the plough, to clear debris left by the plough blade. Limited fendering is provided for in the lower, outboard regions of the plough. A pyramid-shaped horn forms the leading point of the blade. The apparatus is mounted to the front of a ship and secured by means of booms and trunnions or fulcrums situated ahead of midship, well above the waterline. Connecting booms extending aft the trunnions are counterweighted. The actuations are power- ed and controlled by hydraulic pump systems or cable and winch drums. This apparatus is distinguishable from other inventions in that it articulates, while others are fixed, conventional ice- breakers have a compromised angle of attack, preset, that does not and can not address the fact that ice thicknesses vary and that the uptimum energy efficiency is achieved when the broken ice, on the lifting surfaces of the plow, is quickly dumped to the rear sides of the plow, allowing new brash ice to flow over the lifting sufaces. Clearing of broken ice from the upward thrusting plough surface is directly related to the ice break- ing performance. My invention has infinite angle and depth variation, with- in any foreseeable requirements.
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