Icebreaking ship
AssigneeThyssen Nordseewerke GmbH
InventorsPeter Jans, Karl-Heinz Rupp, Jens-Holger Hellmann
Life of this patent
Estimating the term…
Abstract
For icebraking ships whose forward quarter is designed like a pontoon with an underside rising obliquely forward, and having icebreaking configurations on its sides, the hull can be equipped on both sides over the entire length of the ship with balcony-like flanks that improve the maneuverability of the icebreaking ship. The undersides of the balcony-like flanks can drop off obliquely downward and preferably lie at the level of the water line so that, during the turning of the ship, the oblique undersides can break off the edges of the ice. Further, the underside of the bow in the vicinity of the icebreaking configurations can be designed wider that the water line of the afterbody, to thus provide a clearance between the edges of the ice and the hull.
Claims17
A ship for breaking ice to clear a channel through an ice field, the ship having a hull, said hull having a bow, a stern, a length extending from said bow to said stern, first and second sides extending from said bow to said stern, and a width between said first and second sides, said hull comprising:
- icebreaking means, said icebreaking means extending across a width of said bow and along a substantial portion of the length of said hull along each of said first and second sides thereof;
- said hull is for being disposed in water to a depth defined by a water line, and said icebreaking means being disposed at least in the vicinity of the water line;
- said first and second sides of said hull have a first wall portion disposed below the water line, a second wall portion disposed above the water line, and a connecting portion connecting said first wall portion to said second wall portion;
- said connecting portion being disposed substantially along said water line of said ship;
- said hull having a first width at said first wall portions, and a second width at said second wall portions, said first width being less than said second width;
- said connecting portion comprising said icebreaking means along each of said first and second sides;
- each of said first wall portions and said second wall portions are disposed substantially vertically;
- and
- said connecting portion is disposed obliquely downward between said first wall portion and said second wall portion at an angle of about 30.degree..
An icebreaking ship having a bottom, a hull, a forward quarter designed like a pontoon, a bow, an afterbody disposed sternward behind the bow, and a longitudinal axis, the hull comprising:
- a first side and a second side disposed in a spaced apart relation with respect to one another and extending along the afterbody;
- the bow having an underside extending from the ship bottom at roughly the beginning of a front third of the ship and rising obliquely forward to above the water line;
- the bow having lateral edges in the vicinity of the water line, said lateral edges comprising icebreaking means;
- both the afterbody and the bow having a width in the vicinity of the water line, the width of the bow in the vicinity of the water line being greater than the width of the afterbody in the vicinity of the water line;
- first side wall portions disposed below the water line and projecting flanks disposed above the water line on both of the first and second sides of the hull;
- said projecting flanks on both of the first and second sides comprising a parapet portion oriented roughly vertically, and said first side wall portions being oriented roughly vertically;
- said projecting flanks comprising an underside portion adjoining the parapet portion, the underside portion being oriented obliquely downward towards the first side wall portions;
- the underside portions having a width extending from the first side wall portions to the parapet portion, and the ship water line runs roughly parallel, preferably somewhat outward, to a half-width of the underside portions of the projecting flanks;
- said projecting flanks extend along at least a substantial portion of the length of the hull, have no indentations directed toward the interior of the ship, and run essentially parallel to the longitudinal axis of the ship;
- the underside of the bow having a first width at its starting point on the bottom of the ship, and the hull having a second width extending from the first side wall portion on the first side of the hull to the first side wall portion on the second side of the hull;
- the first width corresponding roughly to the second width, and from the starting point of the bow on the bottom of the ship, forward, the underside of the bow widens continuously to reach the width of the underside of the bow in the vicinity of the water line;
- and
- the hull has a third width extending from the parapet on the first side of the hull to the parapet on the second side of the hull, said third width being substantially a width of an upper deck of the ship, and said third width being greater than the width of the underside of the bow in the vicinity of the water line.
Dependencies are inferred from the claim text.