A lawn aerator has a series of tine assemblies spaced along a driven shaft driven by a motor.Each tine assembly has a plurality of tines for aeration extending in a substantially radial pattern about the driven shaft.The inner tine assemblies along the middle portion of the driven shaft are secured to the driven shaft to drive the aerator along the lawn as the driven shaft rotates.The outer tine assemblies adjacent to the ends of the driven shaft are rotatably mounted to the driven shaft.This permits the outer tine assemblies to rotate independently and thereby makes the aerator more maneuverable and easier to turn.Removable weights can be attached to either side of the aerator housing to help maintain a straight course when traversing a slop.
一台草坪打孔机具有一系列打孔针组，这些打孔针组沿着由发动机驱动的轴间隔分布。每个打孔针组都含有多枚打孔针，这些打孔针围绕驱动轴以辐射形状排列充分地展开，可以为被打上孔的根系通气。置于驱动轴中间部分里面的打孔针组相对于驱动轴是固定的,当驱动轴旋转时，这些打孔针组随着驱动轴一起旋转顺着草坪驱动着打孔机。接近驱动轴两端的外面的打孔针组是可旋转地安装在驱动轴上。这就允许外面的打孔针组独立地旋转，从而使得打孔机更易操作和转向。当通过一斜坡时，附在打孔机机壳两侧的可移动的配重可以帮助保持机器走直线球路。