Patent ID: 7273078

Claim:
A tree delimber, comprising: a) a base frame, said base frame including a horizontal roof; b) a delimber knife; c) a yoke assembly including a floor plate mounted on said horizontal roof for rotation about a vertical axis, said yoke assembly supporting said delimber knife above said floor plate and mounted for pivotal movement about a horizontal axis; and d) a roller system extending between said horizontal roof of said base frame and said floor plate of said yoke assembly and supporting said yoke assembly; e) said roller system including a roller unit mounted in said base frame; f) said roller unit including a support roller journalled in a roller box on an axle shaft and protruding upwardly through said horizontal roof; g) a roller adjustment member moveable in said roller box and engaging said shaft; h) said roller adjustment member being horizontally movable in said roller box and effective to adjust and said roller vertically relative to said horizontal roof so as to properly support said floor plate; and i) a fluid pressure system for horizontally moving said roller adjustment member so as to urge said roller into proper support with said floor plate.