Trail scraper

Claim 1

A trail scraper comprising a front unit and a pair of rear units, said rear units disposed side by side and trailing said front unit, said front unit including a pair of chassis rigidly joined together in laterally spaced-apart relationship, a scraping assembly and a levelling assembly rigidly secured to each of said chassis of said front unit and operatively projecting underneath thereof, said scraping assemblies of said front unit each including scraping members projecting transversely inwardly and rearwardly towards each other, and funneling scraped material towards the levelling assemblies of said front unit and runners secured to said front unit transversely adjacent the opposite sides, respectively of each of said chassis of said front unit and having upturned front ends for sliding over oncoming obstacles for raising said front unit for sliding thereof over said obstacles, each of said rear units comprising a chassis, a scraping assembly and a levelling assembly trailing said scraping assembly, both assemblies rigidly secured to said chassis of each rear unit and operatively projecting underneath thereof, said last-named scraping assembly including scraping members projecting transversely inwardly and rearwardly towards each other symmetrically relative to the longitudinal central axis of said chassis of each rear unit and operatively inwardly funneling scraped material towards said trailing levelling assembly, and a compaction assembly trailing said levelling assembly of each rear unit and including a panel having an upwardly curved front end portion pivoted to said chassis of each rear unit about a transverse axis and a compacting planar portion projecting rearwardly from said front end portion, hinge means joining said rear units to said front unit and defining pitch and yaw pivot axes for each of said rear units relative to said front unit, connecting means laterally joining said chassis of said rear units together side by side, said connecting means including elongated pivots upwardly carried by said chassis of said rear units, and a pair of bars pivotally and slidably connected at their opposite ends to said elongated pivots and arranged in spaced parallel relationship holding said rear units in parallel spaced-apart relationship relative one to the other and allowing up and down displacement between said rear units and said bars, and an adjustable linkage operatively connected to each compaction panel of each rear unit and to the corresponding chassis of the rear unit and arranged for pivoTal adjustment of the associated compaction panel, each of said adjustable linkages including a first lever pivotally connected to the corresponding chassis and angularly adjustable relative to the latter chassis and a second lever pivotally connected at one end to the corresponding first lever, and at the other end to the corresponding compaction panel rearwardly of the corresponding transverse pivot axis and arranged to produce said pivotal adjustment.