초록 ▼

A navigation channel is made in the ice covering the surface of a waterway by propelling a vessel so that its bow breaks the ice to form a channel having a width of the beam of the ship and an auxiliary channel is similarly formed at each side of the ship in rear of its bow to provide leeway for the

A navigation channel is made in the ice covering the surface of a waterway by propelling a vessel so that its bow breaks the ice to form a channel having a width of the beam of the ship and an auxiliary channel is similarly formed at each side of the ship in rear of its bow to provide leeway for the ship to turn. As the ship is turned, the auxiliary channel is enlarged by breaking the ice on the edge of the auxiliary channel toward the stern of the ship to give it greater leeway to turn. The auxiliary channel may be broken out by fin means projecting from the side of the ship effective to exert forward, upward and outward force against the ice blanket to break pieces from it.

대표청구항 ▼

A ship having a hull of length from about 600 to about 1000 feet provided with straight substantially vertical elongated sides tapering inwards, at one end, into a pointed bow normally adapted, with the forward motion of the ship against an ice covering of a waterway, to break a channel in said cove

A ship having a hull of length from about 600 to about 1000 feet provided with straight substantially vertical elongated sides tapering inwards, at one end, into a pointed bow normally adapted, with the forward motion of the ship against an ice covering of a waterway, to break a channel in said covering equivalent to the normal width of the ship to allow the ship to move forward, a bulky icebreaking fin mounted to project outwards from each straight side just behind the bow with a fixed continuous deflecting surface extending from below to above the waterline at a sternward angle of from 10°to 60°from a line perpendicular thereto and along its length a sternward incline thereby, with the advance of the ship to apply forward, upward and outward pressure on the ice beside the main channel to break an auxiliary channel thereby to provide leeway for the ship to move forward through the ice and to execute turns, the fin having a fore to aft width from about 2 feet to about 3 feet and an effective thickness measured out from the ship\s side of from about 1 foot to about 4 feet.