| 摘要 |
A marking device includes a support having a first end engaged with a ground surface, and a second end positioned away from the ground surface. A force transfer structure is connected to the second end of the support, wherein the force transfer structure has a diameter less than a diameter of a middle portion of the support. A cylindrical biasing mechanism attached to the middle portion of the support, wherein the cylindrical biasing mechanism has a first end, a second end and a middle portion, wherein the middle portion has a diameter that exceeds a diameter of the first end and the second end. An elongated rod, attached to the second end of the cylindrical biasing mechanism at a first end. |
