Collapsible marker cone

作者： Gary Rokosny

DOI:

关键词: Cone (topology) 、 Base (geometry) 、 Mathematics 、 Falling (sensation) 、 Conical surface 、 Vertical axis 、 Geometry

摘要: A collapsible marker cone for use with sporting events, such as in-line skating, comprising a base and conical portion. The portion is attached to the along vertical axis includes weakened regions vertically disposed slots which allow easily collapse, axis, when predetermined force, weight of falling person, applied axis. collapse prior injuring person.