Suspension assembly for wheeled conveyance

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.