Abstract: A barrier mechanism for vehicles arranged to receive containers comprising dispensable content comprises a bracket arranged to be moveably mounted at a dispensing side of the vehicle and an activation device. The activation device is operable to move the bracket between a non-deployed state, to accommodate loading of the container onto the trailer, and a deployed state, for securing container content during dispensing of content at the barrier side of the vehicle.

Abstract: A barrier mechanism for vehicles arranged to receive containers comprising dispensable content comprises a bracket arranged to be moveably mounted at a dispensing side of the vehicle and an activation device. The activation device is operable to move the bracket between a non-deployed state, to accommodate loading of the container onto the trailer, and a deployed state, for securing container content during dispensing of content at the barrier side of the vehicle.

Abstract: One aspect of the invention provides a positioning system comprising at least one master ram and respective slave ram, at least one travel stop and at least one pressure relief valve. The or each travel stop is arranged to restrict the travel of one or more slave piston when the system is misaligned, at least one pressure relief valve being arranged to vent excess pressure in the operating fluid arising as a result of such restriction. The positioning system is particularly suited for incorporation into a steering system, especially for an articulated vehicle.

Abstract: The present invention relates to a linkage mechanism (10) for operative association between a fifth wheel on a drive vehicle and at least one pair of steerable rear wheels. The linkage mechanism (10) is arranged so as, in the first phase, to convey rotary movement of the fifth wheel to rotary movement of the at least one pair of rear wheels and, in a second phase, to permit further rotary movement of the fifth wheel substantially without further rotary movement of the at least one pair of rear wheels. The linkage mechanism (10) comprises a pivotable crank (12); a cam roller (24) in operative association with the fifth wheel; and a cam collar (26) in operative association with the crank (12). The invention also relates to a vehicle having at least one pair of steerable rear wheels and incorporating the linkage mechanism (10).