| 摘要 |
A modular marking system for permanently marking the playing field on an athletic field with removable upright visible markers containing a variable diameter spring means for attaching an above ground, upright visible marker to a ground anchor. The variable diameter spring means comprises heavy gauge coiled steel having a large diameter coil section disposed within the ground anchor and a small diameter coil section secured within the upright visible marker, where the intermediate diameter reduction area is approximate to ground level to facilitate bending at ground level upon impact from any direction. The ground anchors permanently mark critical intersecting points of playing field lines, where the ground anchors can be used for aligning and visible marking playing field lines and subsequently for supporting the upright visible markers. The modular marking system is particularly useful for permanently marking different playing fields on the sme athletic field.
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