Anti-theft device with extractable armored column

Claim 1

Anti-theft device for protecting open or enclosed areas and doors of rooms, comprising a steel base which has the shape of an at least partially box-like body and has walls at least partially covered by plates of drill-proof metallic alloy, said base being horizontally buryable in a walking surface and being centrally provided with a through opening, a vertical prism-shaped container made of steel being rigidly applied to said opening, said container having longitudinal and transverse reinforcement ridges and being completely embeddable below the walking surface, an armored column being telescopically and removably insertable in said container, said column being at least partially internally filled with material with high abrasion resistance and high hardness and being provided with means for its anchoring to locking means provided inside said base, said column which protrudes from said base constituting a valid obstacle to the transit of vehicles and the like stored in the area protected by one or more extractable-column anti-theft devices, wherein said column is constituted by a box-like body made of steel, said box-like body having an internal cavity, and defining a part protruding from said base, said internal cavity of at least said part of said box-like body which protrudes from the base being filled with material which is substantially unassailable by perforation means and cutting means, said material being retained by two opposite covers which are mutually rigidly associated by a central tubular spacer and by a related traction element arranged within said spacer.