The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1982
Filed:
Dec. 27, 1978
Oy Wartsila AB, Helsinki, FI;
Abstract
In an ice-breaking ship, having sufficient power and being generally designed for efficient ice-breaking, the breaking of the ice is made more effective by changing the zone of ice crushing and shearing which occurs at the stem during normal ice-breaking of level ice, to a zone where the breaking occurs due to bending. This is obtained by forming the front portion of the ship so that at least within the area where the stem contacts and breaks level ice, the basically wedge-formed stem is truncated to form a relatively broad runner-like portion being inclined forwards in a relatively small angle to the water line plane of the ship. The width of the runner-like portion is determined in conformity with the general ice-breaking ability of the ship, whereby the driving power (P) of the ship, in kW, and the maximum beam (B) of the ship at its design water line, in meters, forms the basis for calculating, in meters, the width (W) of the runner-like portion by means of the formula: