| 摘要 |
PROBLEM TO BE SOLVED: To provide a ridger capable of easily and continuously conducting control for obtaining a ridge having a required height. SOLUTION: This ridger attached to a tractor T is composed of ridging rotors and ridge-forming boards 16, wherein an insert rod 11 is attached to a rear end of the tractor T through a hinge 19, two pairs of screws 13, 13 are each attached protuberantly to both the right and left sides of the insert rod 11, a square pipe 12 having at the front end an opening capable of receiving the insert rod 11 and perforated on both the right and left sides to have two pairs of connecting slots 14, 14 is coupled with the insert rod 11 by jointing the connecting slots 14 to the screws 13 so that the square pipe 12 freely moves along the outside of the insert rod 11, and the ridge-forming boards 16 are each attached to both the right and left ends of a crossbar 15 which is attached to the rear end of the square pipe 12 to be joined as a unit.
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