Patent ID: 7896118

Claim:
A stretcher including a least three non-driven wheels and at least one driven wheel moveably mounted on the stretcher, the driven wheel being movable relative to at least one of the non-driven wheels between a driven position in which the driven wheel is in contact with the ground and at least one non-driven wheel moveably mounted on the stretcher spaced from the ground and a non-driven position in which the driven wheel is spaced from the ground and the non-driven wheel is in contact with the ground, wherein the driven wheel and the at least one non-driven wheel are connected to a link that is pivotally mounted on the stretcher with, in the longitudinal extent of the stretcher, the rotational axis of the driven wheel being on one side of the pivotal mounting of the link on the stretcher and the rotational axis of the non-driven wheel being on the other side of the pivotal mounting of said link, wherein the pivotal movement of said link being arranged to cause the height of a patient support above the ground to first decrease and then to increase as movement occurs between the two positions.