Security fence with secured bolts

Abstract

A fence pale P for a security fence comprises at least one hole 3 to receive a fastener 4 having a head 9 and a shank 8, with the shank 8 extending through the hole 3 and the underside of the head 9 being in contact with the surface 1 of the pale P, wherein integral shoulder means 20 are located adjacent the or each hole 3, said shoulder means 20 being shaped to deny access to the underside of the head 9 of a so-received fastener 4, whereby the fastener 4 cannot be prised away from the pale P.

1 . A security fence comprising two posts, pales and at least one rail, wherein the pales are generally vertical and secured by fastener means to a generally horizontal rail, wherein the pales have at least one hole to receive a fastener having a head and a shank, the shank extending through the hole, the underside of the head being in contact with the surface of the pale, shoulder means being located adjacent the or each hole, the shoulder means being shaped to deny access to the underside of the head of a fastener received in the hole, whereby the fastener cannot be prised away from the pale.  
     
     
         2 . A fence according to  claim 1 , wherein each pale comprises a cold-formed metal section having a longitudinal web and a longitudinal side wing extending from each side thereof, the hole and shoulder means being present in and on the web respectively.  
     
     
         3 . A fence according to  claim 1 , wherein the shoulder means comprises two shoulders on diametrically opposite sides of the or each hole.  
     
     
         4 . A fence according to any of  claim 2 , wherein the side wings extend out of the plane of the web, such that, in co-operation with the shoulder means, they deny access from every direction of the fastener received in the hole.  
     
     
         5 . A fence according to  claim 1 , wherein each shoulder comprises a ramp portion rooted remote from the or each hole and inclined upwardly theretowards and terminating in a face portion inclined downwardly towards the or each hole.  
     
     
         6 . A security fence pale, the pale having at least one hole to receive a fastener having a head and a shank, with the shank extending through the hole and the underside of the head being in contact with the surface of the pale, shoulder means being located adjacent the or each hole, the shoulder means being shaped to deny access to the underside of the head of a so-received fastener, whereby the fastener cannot be prised away from the pale.  
     
     
         7 . A pale according to  claim 6 , comprising a cold-formed metal section having a longitudinal web and a longitudinal side wing extending from each side thereof, the hole and shoulder means being present in and on the web respectively.  
     
     
         8 . A pale according to  claim 6 , wherein the shoulder means comprises two shoulders on diametrically opposite sides of the or each hole.  
     
     
         9 . A pale according to  claim 6 , wherein the side wings extend out of the plane of the web, such that, in co-operation with said shoulder means, they deny access from every direction of the so-received fastener, in use.  
     
     
         10 . A pale according to  claim 6 , wherein each shoulder comprises a ramp portion rooted remote from the or each hole and inclined upwardly theretowards and terminating in a face portion inclined downwardly towards the or each hole.  
     
     
         11 . A method of forming a pale according to  claim 6 , the method comprising cold-rolling steel sheet to form an elongate member having integral shoulder means and then forming a hole in the member, the hole being located such that said shoulder means are adjacent thereto.