Importance

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Abstract

A vertical trencher having a cutter body with cutting teeth arranged in a spiral configuration on its circumference with an increasing rise angle, for excavating various size trenches, which is operable at high speed and efficiency, and suitable for use on hard and rocky ground. The cutter body is formed with a spiral-shaped concave channel, with grinding teeth attached to its outer edge. The grinding teeth cut soil and rock loose, so that pieces are scooped into the concave channel. The rise angle of the concave channel to the horizontal increases along the length of the cutter body. Thus, loose pieces of soil are transported upwardly along the concave channel at an increasing axial speed. The cutter body is connected at its upper end to a hydraulic engine mounted on the housing, which provides rotational power. The combination of centrifugal force and increased axial speed developed by rotation of the cutter body causes the transported soil to be thrown from the concave channel through the aperture in the housing, above the trench. Advantages of the cutter body design include its use as a single moving part, which simplifies its construction and operation, while reducing cost. The cutter body has reduced contact area with the soil, which reduces the rotational power required.

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First Claim