Importance

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Abstract

A base member and bit holder assembly for replaceably mounting a bit on a mining machine, road working machine or earth moving machine. The bit is of the type having a shank terminating in at least one working end. The bit holder has a shank receiving perforation therein to receive the shank of the bit. A bit retainer releasably retains the bit shank in the bit holder shank receiving perforation. Cooperating abutment surfaces on the bit holder and bit determine the depth to which the bit shank extends into the shank receiving perforation of the bit holder. The bit holder has a tapered shank portion, and the base member has a correspondingly tapered cavity extending therethrough. The angularity of the tapers of the bit holder shank and base member cavity are the same, falling within the range of from about 6.degree. to about 12.degree. and are such that once the bit holder shank has been set in the base member cavity it will remain there until removed by an appropriate tool. The rearmost end of the bit holder extends through the base member and is provided with a split metal safety ring.

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First Claim