Safety barrier

Abstract

This present invention concerns a safety barrier that includes a boom ( 100 ) carried by a support mounting ( 200 ), associated with a drive system that is suitable for selectively moving the boom ( 100 ) between a horizontal rest position, barring the roadway in a manner that blocks passage, and a temporary position opening up the said roadway to permit the passage of traffic on the roadway when authorised access is detected, the said boom ( 100 ) being able to move in relation to the support mounting ( 200 ) when, in the rest position, it is subjected to an impact that is greater than a given threshold, so that damage is avoided, characterised by the fact that it includes elastic resources ( 222, 224 ) for the automatic return of the boom to its position ( 100 ) on the said support mounting ( 200 ).

1 . A safety barrier including a boom, a support mounting which carries the boom, a drive system suitable for selectively moving the boom between a horizontal rest position, barring a roadway in a manner that blocks passage, and a temporary position opening up the roadway to allow passage via the roadway when authorised access is detected, the boom being able to move in relation to the support mounting when, in the rest position, it is subjected to an impact greater than a given threshold, so that damage is avoided, comprising: resources for detecting a movement of the boom in relation to the support mounting, and elastic resources for automatic return of the boom to its position on the support mounting.  
   
   
       2 . A barrier according to  claim 1 , further including resources suitable for automatically placing the support mounting in a vertical position when movement of the boom is detected, in such a manner that the re-positioning of the latter on the support mounting takes place other than on the roadway.  
   
   
       3 . A barrier according to  claim 1 , wherein the boom is articulated on the support mounting about a secondary axis, at an angle to an axis of rotation of the support mounting.  
   
   
       4 . A barrier according to  claim 1 , wherein the elastic resources include at least one spring.  
   
   
       5 . A barrier according to  claim 4 , wherein the spring is coaxial with an axis of rotation of the boom in relation to the support mounting.  
   
   
       6 . A barrier according to  claim 1 , further including two springs for return of the boom to its position of use in relation to the support mounting.  
   
   
       7 . A barrier according to  claim 1 , wherein the elastic resources include at least one torsion spring the ends of which are attached respectively to the boom and the support mounting.  
   
   
       8 . A barrier according to  claim 1 , further including an intermediate support fitted between the boom and the support mounting.  
   
   
       9 . A barrier according to  claim 8 , wherein the intermediate support includes two cheek pieces designed to grip one end of the boom.  
   
   
       10 . A barrier according to  claim 1 , further including holding resources to hold the boom on the support mounting unless a force greater than a given threshold is applied to the boom.  
   
   
       11 . A barrier according to  claim 10 , wherein the holding resources include a magnet carried on one of the boom and the support mounting, and a polar plate carried on the other one of the boom and the support mounting.  
   
   
       12 . A barrier according to  claim 11 , wherein the holding resources include an electromagnet.  
   
   
       13 . A barrier according to  claim 10 , further including resources providing flexible support for one of the holding resources so as to allow self-positioning of the latter.  
   
   
       14 . A barrier according to  claim 1 , further including resources which prevent positioning of the support mounting in the horizontal position unless the boom is in its normal position on the support mounting.  
   
   
       15 . A barrier according to  claim 1 , wherein the resources for detecting the movement of the boom in relation to the support mounting trigger a timing process in the event that a displacement is detected.  
   
   
       16 . A barrier according to  claim 1 , wherein the support mounting possesses a longitudinal symmetry.  
   
   
       17 . A barrier according to  claim 1 , further including resources limiting the pivoting of the boom to an angle of the order of 90° in relation to the support mounting.  
   
   
       18 . A barrier according to  claim 17 , wherein one end of the boom or of an associated intermediate support is designed to come up against an edge of a core of a stirrup of the support mounting in the event of displacement, in order to limit the relative pivoting between the boom and the support mounting.  
   
   
       19 . A barrier according to  claim 1 , wherein the boom is manufactured from a composite material.  
   
   
       20 . A barrier safety assembly according to any one of claims  1 - 19  further including a support mounting, a boom capable of displacement in relation to the latter when it is subjected to an impact greater than a given threshold, and elastic resources for the automatic return of the boom to its position on the support mounting.