US Patent 7621003 Self-locking swivel castor wheels for roll-in cot

A roll-in cot (1) having a patient support attached to a wheeled transporter wherein the wheeled transporter comprises leading (3) and trailing (4) collapsible legs having respective proximal ends pivotally connected to a frame (2) and distal ends including swivel castor wheels (18A, 18B) wherein at least the swivel castors (18A) of the leading collapsible legs (3) are operable in either a swivel or lock mode, and wherein the swivel mode is only operable by a castor release mechanism (22) while the cot (1) is in a fully upright position.