Security bollard

Abstract

The present invention relates to a a security bollard and, in particular, to a security bollard designed to be used as a protective measure to be placed in front of shop fronts and Automatic Teller Machines (ATMs) that may be subjected to ramming by vehicles. The bollard includes a first upright hollow member having an outer wall defining a chamber, and a plurality of vertical longitudinal jamming rods disposed inside the chamber. Each jamming rod has associated therewith a biasing means for biasing the members in a longitudinal direction so as to act like a disk brake on cutting implements attempting to cut through the jamming rods, and to also close the gap created by the cut should the cutting implement be retrieved and cutting attempted again.

1 . A security bollard characterised by: a first upright hollow member having an outer wall defining a chamber; a second vertical longitudinal member disposed inside said chamber; and a biasing means associated with said second vertical longitudinal member, said biasing means adapted to bias said second vertical longitudinal member in a longitudinal direction. 
     
     
         2 . A security bollard as characterised in  claim 1  wherein said second vertical longitudinal member is in the form of a material which substantially fills said chamber, said material adapted to be strong in compression. 
     
     
         3 . A security bollard as characterised in  claim 2  wherein said bollard further includes a pressure plate disposed at a longitudinal end of said material, said biasing means being in the form of a spring adapted to apply pressure against said pressure plate in a direction towards said material. 
     
     
         4 . A security bollard as characterised in  claim 3  wherein said bollard is embedded in a ground cavity, said pressure plate and spring being disposed below a ground surface inside said chamber and adapted to provide an upwards pressure on said material. 
     
     
         5 . A security bollard as characterised in  claim 2  wherein said material is a resin mixture. 
     
     
         6 . A security bollard as characterised in  claim 2  wherein said security bollard further includes a central upright longitudinal tube defining a core of said bollard. 
     
     
         7 . A security bollard as characterised in  claim 1  wherein said first upright hollow member is made from steel. 
     
     
         8 . A security bollard as characterised in  claim 1  wherein said second vertical longitudinal member is in the form of at least one vertical longitudinal member disposed longitudinally inside said chamber, wherein said at least one member has associated therewith said biasing means to bias said at least one member in a longitudinal direction. 
     
     
         9 . A security bollard as characterised in  claim 8  wherein said bollard is embedded in a ground cavity, and each of said biasing means is in the form of a spring disposed below a ground surface inside said chamber, said spring adapted to provide an upwards pressure on said at least one vertical longitudinal member. 
     
     
         10 . A security bollard as characterised in  claim 9  wherein said bollard includes a cap at an upper end thereof, and each of said vertical longitudinal members comprises a metal shell with an internal core adapted to abut at an upper end thereof with said cap. 
     
     
         11 . A security bollard as characterised in  claim 8  wherein said security bollard includes a plurality of second vertical longitudinal members disposed circumferentially and symmetrically inside the chamber. 
     
     
         12 . A security bollard as characterised in  claim 8  wherein space inside the chamber and between the second upright longitudinal members is filled with a material strong in compression. 
     
     
         13 . A security bollard as characterised in  claim 12  wherein said material is concrete. 
     
     
         14 . A security bollard as characterised in  claim 12  wherein said material is a heat resistant resin mixture. 
     
     
         15 . A security bollard as characterised in  claim 8  wherein said security bollard further includes a central upright longitudinal tube defining a core of said bollard. 
     
     
         16 . A security bollard as characterised in  claim 8  wherein said first upright hollow member is made from steel. 
     
     
         17 . A security bollard as characterised in  claim 1  wherein said bollard is embedded in a ground cavity, said bollard including a horizontal member disposed at a lower end of said bollard, and said ground cavity including a locking mechanism adapted to engage said vertical member and thereby lock said bollard inside said cavity, said locking mechanism including engaging amis moveable between a first locked position in which said arms prevent vertical movement of said vertical member and said bollard, and a second position in which said vertical member and said bollard are vertically moveable. 
     
     
         18 . A security bollard as characterised in  claim 17  wherein said arms are moveable between said first and second positions using a vertical operating lever which is accessible from an exterior of said bollard and an associated rod which connects the lever to the arms such that said arms are caused to rotate between said first and second positions when said vertical lever is moved between an upper and a lower position. 
     
     
         19 . A security bollard characterised by: a first upright hollow member having an outer wall defining a chamber; a second upright hollow member disposed inside said first upright hollow member, said second upright hollow member having an outer wall defining an internal core of said bollard; filling material disposed longitudinally between said first and second walls, said filling material adapted to be strong in compression; and a biasing means associated with said filling material, said biasing means adapted to bias said filling material in a longitudinal direction. 
     
     
         20 . A security bollard characterised by: a first upright hollow member having an outer wall defining a chamber; a second upright hollow member disposed inside said first upright hollow member, said second upright hollow member having an outer wall defining an internal core of said bollard; at least one vertically extending longitudinal jamming bar disposed between said first and second walls; and a biasing means associated with each of said jamming bars, said biasing means adapted to bias said jamming bars in a longitudinal direction