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1. 发明授权

US4775014A Ground-working implement 失效
标题翻译：地勤工具
公开(公告)号：US4775014A
公开(公告)日：1988-10-04
申请号：US827284
申请日：1986-02-06
申请人： Dietrich Ranner
发明人： Dietrich Ranner
IPC分类号： A01B33/16 , E01H4/02 , E02F5/30 , E02F3/78
CPC分类号： A01B33/16 , E01H4/02 , E02F5/30
摘要： A ground-working implement for rotary field tilling or ice or snow-tendingn ski slopes or the like which is drawn by a tractor or a tracked vehicle and which comprises a holder connected to the vehicle pendulously by a longitudinal beam which can be raised and lowered. The holder is connected to a rotary ground-loosening unit and a smoothing board by a four-point linkage whose cranks are dimensioned so that upon raising of the ground-loosening unit the orientation of the smoothing board remains largely unaltered thereby allowing the latter to be used for leveling the ground when the ground-loosening unit is in its raised or rest position.
摘要翻译：一种用于通过拖拉机或履带式车辆牵引的滑雪场等上的旋转田间耕种或冰雪积雪的地面作业工具，其包括通过可以升高的纵梁垂直地连接到车辆的保持架，降低保持器通过四点联动器连接到旋转地面松动单元和平滑板，其曲柄的尺寸被设计成使得在松开地面单元升高时，平滑板的取向保持很大程度上不变，从而允许用于在地面松动单元处于其上升或静止位置时使地面平整。

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