| 摘要 |
The planter row marker has a floatation in slot in the link arm connected to the actuating hydraulic cylinder. The slot has a hooked portion in the outer end which quickly engages the end pin of the cylinder as it is retracted. This rapid engagement eliminates jump or free fall. - The row marker also employs a spring tensioned cable to fully extend the outer link arm before the marker descends to its normal working position where the marker disc contacts the soil. The tension spring allows use of a short cable to effect full extension before reaching the working position, while at the same time providing the extra stretched length needed to assure a clear marking throughout the full floatation range allowed by the slot.
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