초록 ▼

An L-shaped digging tooth includes a trapezoidally configured shank having inner and outer sides. A toe portion projects laterally from one of its edges. An angle of about 90°±30°is defined between the general plane of the toe portion and the plane of the shank. The shank and toe portion terminate i

An L-shaped digging tooth includes a trapezoidally configured shank having inner and outer sides. A toe portion projects laterally from one of its edges. An angle of about 90°±30°is defined between the general plane of the toe portion and the plane of the shank. The shank and toe portion terminate in a common, continuous cutting edge of L or V-shaped configuration having a convex outer boundary and a concave inner boundary. This cutting edge intersects at a leading cutter point, a free inner edge of the toe portion which extends along a line convergent with the shank portion plane. The tooth is hard-faced over a zone adjacent the common leading edge. The invention further relates to an endless chain excavating assembly which includes the described L-shaped teeth arrayed in a specific sequence with, and geometric relationship to, cup-shaped teeth of a known type, with both secured at spaced intervals to an endless chain.

대표청구항 ▼

A trenching chain assembly for use in a trenching machine for digging elongated trenches and comprising: an elongated, endless chain having opposite sides and having a lengthwise aspect and a width, and having a centrally disposed longitudinal axis extending along its length between opposite sides o

A trenching chain assembly for use in a trenching machine for digging elongated trenches and comprising: an elongated, endless chain having opposite sides and having a lengthwise aspect and a width, and having a centrally disposed longitudinal axis extending along its length between opposite sides of the chain, said chain including a plurality of interconnected, articulated links having spaced, tooth-mounting plates each adapted to support a digging tooth, said tooth-mounting plates being located on opposite sides of the longitudinal axis of the chain and generally defining, by their separation, the width of the chain; and an array of digging teeth secured to, and projecting from, the chain, the array of digging teeth including: at least one trench face shearing tooth mounted on the chain and having a toe portion extending generally transversely with respect to the direction of the travel of the chain during the digging of a trench and projecting either inwardly toward the longitudinal axis of the chain, or outwardly away from the longitudinal axis of the chain, said toe portion being spaced from a plane containing the longitudinal axis of the chain; and means for connecting said toe portion to at least one of said plates of the chain, and for spacing said toe portion from said plane containing the longitudinal axis of the chain, said toe portion including a hard-faced leading cutting edge, with the hard facing thereon including particles selected from the group consisting of titanium carbide, tungsten carbide, and ceramic material; and at least one cup-shaped gauge tooth mounted on the chain and spaced longitudinally therealong from each of the trench face shearing teeth on the chain so as to follow and track at least one of the trench face shearing teeth, each of said cup-shaped teeth including a curved, convex outer side facing away from the longitudinal axis of the chain and a concave inner side facing toward the longitudinal axis of the chain, said curved, convex outer side being spaced outwardly from a plane containing the longitudinal axis of the chain and adapted for shearing away the side walls of a trench dug by the trenching chain assembly, and thus constituting gauging teeth for gauging the width of the trench; and means for connecting said cup-shaped tooth to at least one of said plates of the chain.