Patent ID: 7665235
Filing Date: 2010-02-23
Classification: B28D,E02F

Abstract:
1. An endless chain for cutting and removing spoil from a trench, the endless chain comprising: a plurality of adjacent links, and pivot rods pivotally coupling adjacent links end to end to each other, the pivot rods at the ends of each link defining a plane; a plurality of flight plates secured to the plurality of links, the flight plates including an under surface, parallel to said plane, confronting the links and having a pattern of openings extending through each flight plate between the under surface and an outer surface; a plurality of wear plates positioned over the outer surface of the plurality of flight plates, each wear plate having at least one cutting element mounted onto an outer surface of the wear plate; and a plurality of fasteners passing through some of the pattern of openings from the under surface of the flight plate to secure the wear plates to the flight plates.