Patent ID: 6626606
Filing Date: 2003-09-30
Classification: E01F

Abstract:
A barrier arrangement for the control of traffic, said arrangement comprising:an elongate and generally tubular housing mounted in a generally vertical manner within the ground so that an upper end thereof is substantially flush with the ground surface; an elongate post disposed generally coaxially within said housing and telescopingly movable relative thereto between an uppermost position wherein said post extends upwardly from said upper end of said housing and above the ground surface and a lowermost position wherein said post is disposed substantially completely within said housing and beneath the ground surface; and a remotely-actuable drive mechanism for moving said post between said uppermost and lowermost positions, said drive mechanism including an elongate and generally vertically oriented rotatable drive shaft having an outer surface, and a drive member disposed in clamping engagement with said outer surface and non-movably fixed to said post, wherein rotation of said drive shaft causes displacement of said drive member and said post relative to and along said drive shaft to move said post into one of said uppermost and lowermost positions, said outer surface of said drive shaft being smooth so as to permit downward slippage of said drive member and said post relative to said drive shaft upon application of an abrupt and downwardly directed axial force to an upper end of said post during upward movement thereof.