BACK HOE UNIT DETACHABLY MOUNTED TO BACK HOE ATTACHING FRAME IN TRACTOR, COMPOSED OF BASE UNIT, STEP FOR OPERATOR, OPERATING POST, SWING VERTICAL SHAFT, BOOM BRACKET, AND BOOM ASSEMBLY

摘要

PURPOSE: A back hoe unit detachably mounted to a tractor is provided to simplify the structure for a swing cylinder, to reduce a space, and to shorten the longitudinal length of a base unit by moving a boom bracket of the back hoe unit by a single swing cylinder. CONSTITUTION: In a back hoe unit(B) detachably mounted to a back hoe attaching frame(2) mounted at a tractor body in a rear region of a driver's seat, a base unit(B1) is installed with hanging connection units(B14,B15) for hang-fitting and connecting with the back hoe attaching frame. A step for an operator and an operating post(B4) are mounted on the base unit. A movable vertical shaft is supported to the base unit. A boom bracket(B3) is supported at the periphery of the movable vertical shaft to swing. A boom assembly is attached to the boom bracket. One end of a swing cylinder(B5) is connected to the base unit through a first cylinder link unit and the other end is connected to the boom bracket through a second cylinder link unit to swing horizontally the boom bracket. A plane unit of the step is bent for a rear opening portion. The trapezoid operating post having both lateral sides widened toward the rear side is disposed at the rear opening portion. A walk through space(H) is extended from a rear side of the driver's seat to the rear side of left and right inclined sides to lift the step from the left and right sides of the base unit.