A wheeled object of the type adapted to be operated by a walking person

摘要: A wheeled object or vehicle, such as a hospital bed(10) comprises main chassis frame (12) supported by plurality of supporting wheels rollers (11), which define the vertices polygonal surface (21). The bed, is usually moved walking person, provided with at least one motor driven driving device (15), including wheel roller (18), positioned within said surface. rotatable about substantially vertical axis (14) in relation to so change angular position (18) frame. Biasing means, compression spring pneumatic hydraulic cylinder (22, 34) for biasing (15) direction away from and towards force controlled that id kept close non-skidding contact ground floor (21) without lifting (11) out