An attachment assembly for securing ripper teeth to an earth excavation device which comprises a substantially "J"-shaped ripper shank defining a lower forwardly projecting tapered end portion for carrying the tooth, an upper end portion for attachment to the excavation device and a front end wall defining a forwardly projecting elongated securement rib. An elongated wear cap extends over the lower portion of the front end wall of the shank and defines a tapered front digging surface, a lower tapered end portion which merges into the forwardly projecting tapered end portions of the shank and with said portion extends into a cavity in the base of the ripper tooth. The rear surface of the wear cap defines an open channel therein adapted to receive the securement rib on the front end wall of the shank upon the wear cap being transversely slided thereover. A substantially U-shaped securement member is secured to the upper portion of the wear cap and extends about the upper portion of the wear cap and oppositely disposed portions of the side walls of the shank so as to prevent any relative lateral movement between the wear cap and shank.

An attachment assembly for securing excavation teeth to the loading or dipper bucket on large excavation equipment. The assembly includes a bucket lip adapted to be secured to a loading or dipper bucket, and a plurality of shanks adapted to be secured to the lip and carry the excavation teeth. The lip defines a forward edge extending transversely thereacross and defining a plurality of spaced first curvilinear bearing surfaces. Each of the shanks carried by the bucket lip defines a lateral channel therein adapted to receive a portion of the bucket lip and terminating in a second curvilinear bearing surface. The second curvilinear bearing surface abuts and mates with one of the first curvilinear bearing surfaces on the bucket lip upon shank being disposed thereover. The first and second curvilinear bearing surfaces define equal radius segments of a constant radius circle such that the shank can be aligned parallel to at an angle at up to fifteen degrees with respect to the central longitudinal axis of the bucket lip with the abutting and mating relationships of the first and second bearing surfaces being maintained so as to prevent bearing fracture within the shank during use. The mating relationships of the bearing surfaces defined by the bucket lip and shanks obviate the need to provide differently configured shanks for left, right and central mounting on bucket lips provided with conventional arcuate or spade-shaped forward edges and additionally allows the outer most shanks to be angled outwardly from the central axis of the lip to provide a digging clearance for the bucket.

An attachment assembly for securing large excavation teeth on large earth excavation equipment including an excavation tooth, an adaptor having a tapered nose piece at one end thereof for carrying the tooth and defining means rearwardly of the nose piece for securing the adaptor to the excavation implement, a pin for securing the tooth in place on the nose piece and a wear cap adapted to be carried by an engage the adaptor so as to abut a rear portion of the tooth for reducing wear of the adaptor during use. The wear cap defines a forward tooth abutment surface, a first inclined lower surface adapted to abut a first portion of the adaptor rearwardly of the nose piece, a second inclined lower surface spaced from the first inclined lower surface and adapted to abut a second portion of the adaptor and an opened channel disposed between the first and second inclined surfaces and extending transversely through the wear cap. The channel defines a continuously curvilinear transverse inner wall within the wear cap and is adapted to receive a correspondingly configured transversed rib formed on the adaptor such that upon transversely sliding of the wear cap over the rib, the first and second lower inclined surfaces abut the first and second portions of the adaptor and the forward tooth abutment surface of the wear cap is disposed substantially normal to the tooth. The tooth abutment surface defines a pair of locking projections thereon which are received in a pair of similarly configured channels formed in the base of the excavation tooth to interlock the tooth and wear cap and prevent relative lateral movement therebetween.