Importance

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Abstract

A pin assembly for securing large earth excavation teeth on the nose portions of their mounting adaptors attached to the shovel for excavating bucket of the excavating equipment. The pin assembly is comprised of an elongated steel bearing pin and a compressible flexpin adapted for mating engagement with and between the adaptor and the bearing pin. The bearing pin defines a convex bearing surface on the rearward side thereof for engaging portions of the excavation tooth and a concave bearing surface in the forward side thereof for mating engagement with a convex bearing surface defined by the rearward side of the flexpin. The flexpin further defines a convex bearing surface on the forward side thereof adapted to abut the channel wall of the mounting adaptor through which the pin extends and additionally defines a rearward projection on the rearwardly disposed convex bearing surface which extends into a recessed area formed in a central portion of the concave bearing surface on the bearing pin and thereby interlocks the flexpin to the bearing pin to prevent separation thereof during use. Rearwardly offset portions on the forward surface of the flexpin and rearward surface of the bearing pin define interlocking shoulders for engaging the pins with portions of the tooth and adaptor to secure the pin assembly therebetween and provide a tight securement of the excavation tooth on the adaptor.

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First Claim