Abstract: An excavation apparatus including a backhoe bucket having a novel ripper tooth assembly secured to a convex rear side of the backhoe bucket. The ripper tooth assembly includes a mounting base attached to the backhoe bucket. A pair of spaced, parallel, tooth-mounting lobes are secured to the opposite side of a base plate from the side thereof facing the backhoe bucket. These lobes are apertured to receive a pivot pin which pivotally supports an elongated ripper tooth. The ripper tooth has a detachable digging point on one end and an impact surface on the other end. The impact surface impacts against an impact pad mounted on the mounting base at a location such that when the tooth digs, the impact surface will bear against the impact pad, and the impact forces will be distributed into the mounting base, and from then, into the backhoe bucket.

Abstract: An auxiliary ripper tooth for attachment to a backhoe fitted with a quick coupler linkage, which ripper tooth includes an elongated, arcuate shank having a point at one end and a bifurcation at the opposite end. An apertured lobe forms one of the furcations or branches at the bifurcated end, and receives a transversely extending pivotal mounting sleeve. The other furcation or branch has an impact bar secured thereto and extending transversely thereacross at a location to bear against a broad impact surface on the quick coupler linkage.