Patent ID: 6289633
Filing Date: 2001-09-18
Classification: E01F

Abstract:
An obstruction device for preventing passage of vehicles, said device comprising:a cylindrical sleeve having an open top end and a bottom end, said sleeve being adapted for mounting in a ground surface;a cylindrical shaft being telescopically inserted in said sleeve, said shaft having upper and lower ends, a longitudinal axis extending between said ends, and a cylindrical sidewall extending between said upper and lower ends;said shaft being telescopically positionable between an extended position and a retracted position with respect to said sleeve, said upper end of said shaft being spaced apart from said top end of said sleeve when said shaft is in said extended position, said upper end of said shaft being positioned adjacent said top end of said sleeve when said shaft is in said retracted position;said shaft having a plurality of locking fins being extendible therefrom, said locking fins being restable on said open top end of said sleeve for holding said shaft in an extended position when said locking fins are in said deployed position;a locking means for locking said locking fins in said deployed position; andwherein said shaft has a set of generally rectangular apertures through said sidewall thereof, said locking fins being pivotally mounted in said apertures.