Impact attenuating device for vehicle

Abstract

The invention relates to an impact attenuating device ( 1 ) connected to a vehicle ( 2 ), especially a lorry. The impact attenuator ( 1 ) comprises a front part ( 3 ), an attenuating part ( 4 ), a rear part ( 5 ), and an extension device ( 6 ). The front part ( 3 ) is connected to the vehicle ( 2 ) in order to, during a collision into the impact attenuator; transfer the forces from the attenuator to the vehicle The front part ( 3 ) comprises two wheels ( 31 ), with a pivot function, spring system ( 32 ), and a traffic routing board ( 9 ). Between the front part ( 2 ) and the attenuating part ( 4 ) is the extension device ( 6 ) mounted. The extension device ( 6 ) has a transport position and an operation position. In the transport position the extension device ( 6 ) is in its extended position and the attenuating device ( 4 ) is moved away from the front part ( 3 ). The extension device ( 6 ) is connected to the attenuating device ( 4 ) via a horizontal joint ( 63 ). In the transport position the extension device is hanging freely between the rear part ( 5 ) and the front part ( 3 ).

1 . Impact attenuating device ( 1 ) for a vehicle ( 2 ), comprising a front part ( 3 ), for connection to the vehicle ( 2 ), an attenuating part ( 4 ), a rear part ( 5 ), and an extension device ( 6 ) mounted between the front part ( 3 ) and the attenuating part ( 4 ).  
     
     
         2 . Impact attenuating device ( 1 ) according to  claim 1 , wherein the front part ( 3 ) is connected to the vehicle ( 2 ), preferably to the vehicles frame side member, such that during a collision against the attenuator ( 1 ) the forces is transferred to the vehicle ( 2 ).  
     
     
         3 . Impact attenuating device ( 1 ) according to  claim 1 , wherein the extension device ( 6 ) in a first position arranges the attenuator in a transporting position, and in a second position arranges the attenuator in an operating position.  
     
     
         4 . Impact attenuating device according to  claim 3 , wherein the extension device ( 6 ) in the first position extends the attenuator ( 4 ) from the front part ( 3 ).  
     
     
         5 . Impact attenuating device according to  claim 4 , wherein the extension device ( 6 ) in the second position arranges the attenuator part ( 3 ) against the front part ( 3 ) such that forces from a collision against the attenuator is transferred to the vehicle.  
     
     
         6 . Impact attenuating device according to  claim 1 , wherein the extension device ( 6 ) comprises a hydraulic telescopic device ( 61 ).  
     
     
         7 . Impact attenuating device according to  claim 6 , wherein the telescopic device ( 61 ) is connected to the front part ( 3 ) via a vertical joint ( 62 ), and to the attenuating part ( 4 ) via a horizontal joint ( 63 ).  
     
     
         8 . Impact attenuating device according to  claim 1 , wherein the extension device ( 6 ) comprises a boom ( 104 ), mounted to a link ( 102 ).  
     
     
         9 . Impact attenuating device according to  claim 8 , wherein the boom ( 104 ) is connected to the front part ( 3 ) through a vertical- and horizontal joint ( 103 ), such that the attenuating part ( 4 ) is movable as a trailer.  
     
     
         10 . Impact attenuating device according to  claim 1 , wherein the rear part ( 5 ) comprises an operation wheel ( 51 ) with a pivot function, for use in the operating position, and two transport wheels ( 52 ) for use in transporting position.  
     
     
         11 . Impact attenuating device according to  claim 10 , wherein the operating wheel ( 51 ) is in a lowered position in operating position, and in a raised in transport position.  
     
     
         12 . Impact attenuating device according to  claim 10 , wherein the transportation wheels ( 52 ) is in a raised position in the operating position, and in a lowered position in the transportation position.  
     
     
         13 . Impact attenuating device according to  claim 1 , wherein the impact attenuator ( 1 ) comprises an internal hydraulic system ( 10 ), such that the vehicles and impact attenuators hydraulic fluids are kept separate.