Patent ID: 6264221
Filing Date: 2001-07-24
Classification: B60G,B66F

Abstract:
A base structure for a mobile access platform, the base structure including a chassis having at least two pairs of wheels, at least a first one of said pairs of wheels including a suspension mechanism including, for each wheel, a swing arm member on which the wheel is mounted, said swing arm member being arranged to pivot about a substantially horizontal pivot axis, a stop member arranged to engage the swing arm member so as to prevent upwards movement thereof, and biassing means arranged to exert a biassing force on the swing arm member to urge the swing arm member upwards towards the stop member, the biassing force being less than a force needed to maintain the swing arm member in engagement with the stop member when the wheel is unsupported, the arrangement being such that the swing arm members normally engage the stop members when the mobile access platform is standing on flat, level ground.