Navigation in ice covered waterways
US4326476A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1979 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Dec 17, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B35/08
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.