公开(公告)号：US20060002760A1

公开(公告)日：2006-01-05

申请号：US10504068

申请日：2003-02-06

申请人： Joseph Vellozzi ,  Matthew Gelfand ,  John Paner ,  Norman Mackenzie ,  Shubin ruan ,  D. Lance Bullard ,  Dean Alberson

发明人： Joseph Vellozzi ,  Matthew Gelfand ,  John Paner ,  Norman Mackenzie ,  Shubin ruan ,  D. Lance Bullard ,  Dean Alberson

IPC分类号： E01F15/00

CPC分类号： B61L29/08 ,  E01F13/028 ,  E01F13/123

摘要： A heavy duty ground retractable automobile barrier for a railroad crossing. Concrete bunkers are placed at each side of a roadway. An upstanding concrete-filled steel pipe fixed in each bunker has a sleeve for rotational and axial movement. Shock absorbers are mounted on each sleeve. A net extends across the road and is attached to the opposite ends of the shock absorbers. Collision of an automobile with the net creates tensile forces in the net. The shock absorbers expand while rotating about the pipe's axis in response to tensile forces from the net that meet or exceed a minimum threshold. Forces from the net pass through the axis of the steel pipe. The net is stored in a pit transverse the roadway parallel to the railroad tracks and is raised and lowered as appropriate. The net includes a cable that extends across the road in a wave pattern, having peaks, valleys and midpoints, wherein tangents of the wave midpoints are at least 90 degrees from tangents of the peaks and valleys.