Patent ID: 8096727
Filing Date: 2012-01-17
Classification: E01F

Abstract:
1. A retractable barrier system, comprising: a below-ground sleeve having an inner surface; a post received by the sleeve such that the top surface of the post is flush with the ground surface in a retracted position; a structure, whereby the post may be pulled up from the sleeve, and locked into an upright, extended position through a rotational movement; a longitudinal rib on the inner surface of the sleeve, the rib having a cross-sectional geometry and a top surface; and wherein the post includes a bottom flange with a cut-out conforming to the cross-sectional geometry of the rib, such that when the post is pulled up with the flange beyond the upper surface of the rib, the post may be rotated such that the flange rests on the upper surface of the rib, maintaining the post in a vertical, upright position.