Importance

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Abstract

A rotary stone-cutting head has a body generally centered on and adapted to be rotated in a predetermined direction about a body axis. An array of cutter supports on the body are angularly spaced about the axis. Respective outer cutter teeth carried on some of the supports have relative to the axis respective outer cutting edges generally radially equispaced from the axis and defining on rotation of the body about the axis an outer orbit centered on the axis. Respective inner cutting teeth are carried on the rest of the supports, alternating with the outer cutting teeth. Respective hardened-metal inserts mounted on the inner teeth have relative to the axis respective outer ends generally radially equispaced from the axis and defining on rotation of the body about the axis an inner orbit radially within and coaxial with the outer orbit. These inserts are substantially harder than the teeth. At the start of use of the head, the hardened inserts will not engage the surface being cut before the outer teeth. In this manner the hard inserts will only contact the face once the cutting operation is started and the surface being cut is fairly regular.

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First Claim