Patent ID: 8474843

Claim:
A wheeled conveyance including a suspension assembly comprising: (a) suspension arms ( 1 , 3 ) pivotally mounted on a chassis and extending in forward and rearward directions in the region of opposite sides of the chassis, each suspension arm ( 1 , 3 ) having wheel receiving means ( 33 ) at the free end thereof; spring means ( 7 ) disposed in the region of each side of the chassis and acting between the forwardly and rearwardly extending suspension arms ( 1 , 3 ) in such a way that the free ends thereof tend to pivot towards each other; and means ( 5 ) for limiting movement of the suspension arms relative to each other, wherein the limiting means comprises: a pair of limiter plates ( 17 , 19 ) mounted on the chassis in opposite side regions thereof, the upper and lower suspension arms being pivotably mounted to the limiter plates in a region thereof remote from the spring means, the limiter plates restricting lateral movement of the suspension arms; and (b) means ( 37 , 39 , 41 , 43 ) for locking the suspension arms ( 1 , 3 ) relative to each other, the locking means comprising a first strut ( 37 ) pivotably mounted on one of the upper and lower suspension arms of at least one pair of upper and lower suspension arms, and a second strut ( 39 ) pivotably mounted on the other of the pair of suspension arms, the first and second struts being pivotably interconnected with each other, biasing means ( 41 ) urging the first and second struts towards a substantially linear configuration in which the pair of suspension arms are locked relative to each other, and means ( 43 ) for controlling the extent to which the first and second struts are movable by the biasing means towards the substantially linear configuration thereof.