Importance

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Abstract

A cutting drum adapted to be mounted in a roadway surface reclaiming machine includes a cylindrical surface rotatably driven about its axis in a cutting direction. A plurality of cutter bit holding elements are distributed in a pattern over and fixed to the cylindrical surface, each cutter bit holding element having a base portion including a first opening and a second opening. A first cutter bit is received in the first opening and a second cutter bit is received in the second opening. The first and second openings are positioned so that the second cutter bit trails immediately behind and is aligned with the first cutter bit when the cylindrical surface is rotated in the cutting direction, the first and second cutter bits being inclined forwardly in the cutting rotation direction. The first and second openings are situated at two different heights so that the second cutter bit is situated at a greater radial distance from the rotation axis of the cylindrical surface than is the first cutter bit. The first and second openings includes a cylindrical lip portion circumscribing the cutter bit and defining the upper perimetral margin of the openings. The first cutter bit projects outward from the first opening by a distance sufficient to preclude substantial abrasive wear of the second opening cylindrical lip portion thus prolonging the usable life of the cutter bit holding elements.

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First Claim