| 摘要 |
The invention relates to an apparatus for aerating a ground layer, comprising: - a frame movable along a ground surface, - a number of substantially vertically placed aerating pins movable in and out of the ground layer, - each pin being engaged by a pivot arm mounted on the frame for pivoting, and - a guide arm connected to the frame at a distance from the position where the pivot arm engages said frame, - drive means for causing reciprocal pivoting of the pivot arm during the movement of the apparatus along the ground layer. The connections of the pivot arm to the frame and the aerating pin and the connections of the guide arm to the frame and the aerating pin substantially form corners of a parallelogram in the non-loaded state of the aerating pin. At least one of the sides of this parallelogram is changeable in length counter to biasing means, such that the bottom part of the pin is displaced relative to the top part of the pin in a direction opposed to the direction of movement of the frame; and all pivot arms and guide arms engage the frame by means of a central engaging member, the position of which is adjustable relative to the frame.
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