FI62263B - ISBRYTARE ELLER FARTYG SOM ROER SIG I IS VARS SKROV HAR LAENGDRIKTADE TRAPPOR - Google Patents

Description

fJ — fl ANNOUNCEMENT, n 0 £ Ύ W «" »UTLAeONINOSSKRIFT 6226.5 ^ ^ (51) Ky.ik.3 / int.a3 B 63 B 35/08, 1/3 ^ FINLAND — FINLAND (21) ***» «» »" «802264 (22) Hakamlspilv · - Aneeknlnjed ·! 17.07 * 80 (Fl) (23) ΑΙΙαιρΙΜ — GlMghacadag 19 * 03 * 73 (41) Talks JulkMal —MMtoffMCNs 17 * 07 * 80 rrtMItU-} A register hslIitlM (44) Date of transmission - - '

PetMit och rtgisterstyrelsen '' AmMcmutkidod> utUkrutw »publican * 31.OÖ.02 (32) (33) (31) molkaut M | trd priorkat (71) (72) Aalto Olavi Siren, Ulvilantie 27 d C 19» 00350 Helsinki 35,

Suomi-Finland (FI) (74) Oy Heinänen Ab (54) Icebreaker or vessel intended for navigation on ice with longitudinal steps in the hull - Isbrytare eller fartyg, som rör sig i is, vars skrov har längdriktade trappor (62) / 73 (advertisement slip 51074) -Utbruten frän ansökan 752/73 (utläggningsskrift 51074)

The invention relates to an icebreaker or a vessel intended to travel on ice, the hull of which has longitudinal steps and ribs located at least in the bow of the vessel.

The hull of a vessel moving on ice, especially an icebreaker, must be of very strong construction and made of plate material strong enough for the bow to be able to crack the ice and the sides of the vessel to withstand the compressive and wedging force of the ice blocks. This also creates a very high friction between the hull and the ice>

In order for a ship to be able to move in such conditions, large machine forces are required.

It is known per se, especially in connection with boatbuilding, to provide the bottom of the ship with longitudinal steps, as is apparent, for example, from U.S. Patents 3,237,581 and 3,415,213. The placement of ribs on the bottom of a ship is also a well-known technique, as disclosed, for example, in U.S. Patent 3,117,544. In connection with icebreakers, it is also known to use longitudinal projections made on the sides of the ship, as disclosed in Norwegian Patent 123,932.

The vessel according to the invention is characterized in that the ribs are arranged on the side edges of the longitudinal steps of the vessel in the lower part of the hull, so that the ribs on the side sides of the vessel are vertical.

The ribs according to the invention strengthen the bow of the vessel and the vessel can be built of a thinner plate than vessels with smooth hulls. Sharp fins grip the ice blocks and prevent them from moving sideways, and guide them under the ship. Thus, the ice blocks do not wedge between the edge of the ice and the ship. In addition, the ribs break the boulders into small pieces that do not obstruct the passage of the vessels coming after them. The bow of the vessel does not break the ice with the wedge effect, which would result in extra energy consumption. The vessel according to the invention is able to move on ice much lighter and safer than before.

The invention will now be described with reference to the accompanying drawing, in which

Fig. 1 shows the bow of the ship seen from below.

Fig. 2 shows the bow of the ship seen from the side.

Fig. 3 shows a section taken along the line III-III in Fig. 2.

The bow of the vessel has steps 3 parallel to the vertical median plane, starting from the bow of the vessel above the waterline and continuing below the waterline to the bottom of the vessel. The ribs 1 are arranged on the side edges of the steps 3 so that the side surfaces 4 of the ribs are vertical. The cross section of the steps 3 and the ribs 1 is as shown in Fig. 3. When moving on ice, the bow breaks the ice and the ice blocks are guided along the fins according to the invention under the ship.

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The height of the ribs, the shape of their ridge and the distance from each other may vary depending on the conditions for which the vessel is being built. Thus, when the quality of ice or its strength varies, different fins are needed. Ice blocks can be guided under the ship either under the ice or back into the ice rink.