| 摘要 |
<p>The implement consists of a series of digging tools (1), each with two or more blades (2,5) located one behind the other and forming the sides of an articulated parallelogram which is driven by a crank (9). When in operation, the blades move in a trajectory which carries them straight down into the soil at an angle and then lifting from it in a curve. The two blades comprising each of the tools can be set at different and adjustable heights. They thus dig the soil at two overlapping depths.</p> |
