| 摘要 |
<p>A drilling machine including a marker device for marking a next working run in the field to be treated, provided with a marking member (17), which is movable in height relative to the frame of the drilling machine and comprises an arm connected therewith, said arm including a first (57) and a second arm portion (58), which second arm portion (58) comprises a marker element near its end faced away from the machine frame (7), while the connection between the first (57) and the second arm portion (58) comprises at least two connecting elements, one of which (60, 61) including a pivot shaft (61) orientated in an operative position substantially upwardly, destined for pivoting the second arm portion (58) relative to the first arm portion (57) and the other one (62, 63; 64, 70) destined for releasing this connection in case of overloading. <IMAGE></p> |
