| 摘要 |
An elongated tongue-like ice breaker mounted on the bow of a vessel and pivoted to swing with a short oscillating stroke in a vertical plane, to drive under and lift a layer of ice. The tongue is powered by an oscillator having its effective power stroke aligned with the plane of tongue motion and at a substantial lever arm for maximum efficiency. Deflection of the tongue and the oscillation of the entire tongue divert broken pieces of ice upward and outward, clear of the vessel, a minimum of propulsive power being needed even with thick ice. To minimize loads on the oscillator and the vessel, the tongue is primarily of buoyant construction.
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