Patent ID: 6257611
Filing Date: 2001-07-10
Classification: B62D

Abstract:
A linkage mechanism for operative association between a fifth wheel of a drive vehicle and at least one pair of steerable rear wheels, the linkage mechanism comprising:a pivotable crank;a cam roller in operative association with the fifth wheel; anda cam collar in operative association with the crank, the cam collar comprising a substantially obround section opening into a substantially elliptic second and the cam roller engaging against the obround section in the first phase and against the elliptic section in the second phase,wherein the linkage mechanism is arranged so as, in a first phase, to convey rotary movement of the fifth wheel to steering movement of the at least one pair of steerable rear wheels and, in a second phase, to permit further rotary movement of the fifth wheel substantially without further steering movement of the at least one pair of steerable rear wheels.