Endless track pin assembly

Claim 1

An endless track including a plurality of articulately connected track shoes, each of said track shoes connected to an adjacent track shoe by pairs of track pin assemblies: a. each of said track shoes comprising a yoke including i. a pair of spaced-apart collars located at opposite lateral edges along one longitudinal extremity of said yoke, ii. a single collar located at opposite lateral edges along the other longitudinal extremity of said yoke, and iii. a guide portion for guiding the track, each single collar of each shoe being located between a pair of spaced-apart collars on the adjacent shoe; b. each of said track pin assemblies including i. a pin rigidly connected with each of said pairs of collars, ii. a sleeve secured on each pin non-rotatable relative to its pin and coextensive with the spacing between the two collars of its associated pair, iii. a spherical bearing operatively positioned between the collars of each of said pairs, including 1. an inner race secured to the sleeve and non-rotatable relative to the sleeve and having an external convex bearing surface, 2. an outer race concentric with said inner race, being rigidly connected to said single collar and having a concave internal bearing surface complimentary with said convex bearing surface, and 3. a seal mounted on each side of said spherical bearing, each such seal including a sleeve secured to said single collar and an elastomeric ring bonded to said seal sleeve and the sleeve secured on the pin.