EARTH-WORKING TOOL HEAD

摘要

EARTH-WORKING TOOL HEAD A head for a powered earth-working tool is adapted to be driven by a rotating shaft which is driven by the prime mover of the tool. The head includes a housing having an opening for the shaft; a driver gear in the housing fixed to the shaft which rotates with the shaft about an axis; an axle in the housing disposed perpendicularly to such axis of rotation and carrying a driven gear on a portion of the axle away from the ends to mesh with the driver gear and rotate the axle; a pair of pins, offset from the axis of the axle, mounted to move with the rotation of the axle, 180.degree. out of phase with each other; a pair of spindles in the housing disposed substantially parallel to the axle; a pair of connecting rods each having an opening to receive one of the pins and being mounted to swing from one of the spindles about the axis of the spindle; and a pair of earth-working members each fixed to one of the connecting rods to swing from the associated spindle about the axis of the spindle in a pendulum-like oscillation 180.degree. out of phase with the other member. The head has wheels for rolling support; also, a roller is adapted to fit over such wheels to provide an alternative form of rolling support. The members can take particular alternative forms for hoeing, digging trenches or cutting and lifting sod. The trench-digging form has a first elongated portion extending from the vicinity of the housing, a second elongated portion angularly disposed with respect to the first portion and having a twisted orientation with respect to the first portion, and a third portion angularly disposed with respect to the second portion and having a twisted orientation with respect to the second portion. The sod cutting and lifting form of member has a first elongated portion extending from the vicinity of the housing and a second elongated portion extending inwardly and perpendicularly to the first portion.