Patent ID: 8146512

Claim:
An anti-extraction safety device for a guide assembly ( 1 ) of a road vehicle, the anti-extraction safety device comprising: a pair of inclined rollers ( 13 , 14 ) which roll along inclined rolling tracks ( 23 , 24 ) of upper parts of a guide rail ( 19 ), the guide rail ( 19 ) having a head ( 20 ) with protruding flanks ( 21 , 22 ), each of the pair of inclined rollers ( 13 , 14 ) is rotationally supported on a respective spindle shaft ( 15 , 16 ) which are non-rotatably fixed to the guide assembly ( 1 ), each of the protruding flanks ( 21 , 22 ) extends from a respective side of a core ( 27 ) of the rail, a recess ( 25 , 26 ) being formed between each of the protruding flanks ( 21 , 22 ) and the respective side of the core ( 27 ), the pair of inclined rollers ( 13 , 14 ) being protected by a shroud assembly that is non-rotatably fixed to the spindle shafts ( 15 , 16 ), and a base of the shroud assembly comprises extensions ( 46 , 47 ) each of the extensions ( 46 , 47 ) extend under the corresponding protruding flank ( 21 , 22 ) of the guide rail ( 19 ), when in operating position, thereby blocking any guide-assembly-extracting force, and the shroud assembly comprises a pair of protective walls ( 34 , 35 ), each of the protective walls ( 34 , 35 ) is independent from the other and each of the protective walls ( 34 , 35 ) partially covers and protects a respective one of the inclined rollers ( 13 , 14 ), the pair of protective walls ( 34 , 35 ) are releasably coupled to each other by a front linkage ( 41 ), the front linkage ( 41 ) is located adjacent the head ( 20 ) of the guide rail ( 19 ) on a side of the shroud assembly opposite the road vehicle, the front linkage ( 41 ) is at an oblique angle with respect to the head ( 20 ) of the guide rail ( 19 ) and forms a cleaning spoiler to direct objects away from the guide rail ( 19 ).