Raid-prevention device for house door

摘要

The device comprises a bolt which engages in a sleeve fixed in the floor or plaster. Steel, hardened or high-grade steel, plastics or another suitable material may be used. The bolt can be formed by a round bar of any desired cross-section, and can have a round or non-round collar. The sleeve can be formed by a tube open at one or both ends, and on the outside it can have lengthwise or transverse reinforcing ribs.