Patent ID: 7690177

Claim:
A string trimmer mechanism intended for mounting on a front end of a tractor comprising: a mounting structure for mounting on the front end of the tractor and including a vertical planar plate member and first and second spaced parallel pivot pins fixedly secured to an extending forwardly from the plane of the plate member; a string trimmer assembly; a trimmer positioning mechanism interconnecting the mounting structure and the trimmer assembly and including an extension power cylinder pivotally mounted at one end thereof on the first pivot pin and connected at another end thereof to the string trimmer assembly and operative to move the trimmer assembly laterally relative to the first pivot pin; and a lift power cylinder assembly including a lift power cylinder pivotally mounted at one thereof on the second pivot pin and operative to pivot the extension power cylinder vertically about an axis of the first pivot pin and thereby raise and lower the trimmer assembly; the mounting structure further including a third pivot pin extending forwardly from the plane of the plate member in spaced parallel relationship to the first and second pivot pins and the lift power cylinder further including a lever pivotally mounted intermediate its ends on the third pivot pin, connected at one end thereof to the lift power cylinder, and carrying a roller at its other end positioned beneath the extension power cylinder whereby actuation of the lift power cylinder acts to raise and lower the extension power cylinder and thereby the string trimmer assembly.