Abstract: A lock for an attachment system that connects a ground engaging tool to a bucket lip. The lock is disposed, in use, between lug of a lip of the bucket and the ground engaging tool. The lock has a body, a force applying member and a force receiving member. Application of force by the force applying member causes the force receiving member to protrude from a first side of the body and to engage the lug. Relative hardnesses of the lug, the body, the force applying member and the force receiving member are such that application of a sufficiently large force via the lug to the protruding portion of the force receiving member preferentially deforms the protruding portion of the force receiving member ahead of deformation of the body or the force applying member as a preferred lock failure mode.

Abstract: An anchor for a wear assembly on an excavating bucket is disclosed. The excavator bucket lip has a base having a nose, and the wear assembly includes a wear member having a cavity in which the nose can be received, and an aperture extending between an outside surface of the wear member and the cavity, an internally toothed ring being located within the aperture; and a lock for releasably holding the wear member to the base. The lock includes an operable member and an externally toothed resilient ring, the resilient ring having a central aperture for engagement with the operable member. The operable member and resilient ring are jointly rotatable relative to the cavity and the internally toothed ring between a plurality of rotationally spaced locking positions where the lock secures the wear member to the base with varying tightness, and a release position rotationally spaced from the locking positions.

Abstract: A lock is disclosed for use within an attachment system that connects a ground engaging tool to a bucket lip. The bucket lip has a lug attached thereto, and the ground engaging tool having a recess which receives the lug in use. The lock is disposed, in use, between the lug and the ground engaging tool. The lock has a body, a force applying member and a force receiving member, such that the application of force by the force applying member causes the force receiving member to protrude from a first side of the body and to engage the lug. The present invention involves providing a preferred failure mode for the lock.