Patent ID: 7918503

Claim:
An adjustable vehicle seat comprising: a moveable squab element mounted to an underlying mount by a first linkage carrying an intermediate support, the first linkage moveable from a retracted position to an extended position and operable to affect vertical adjustment of the intermediate support relative to the mount; a second linkage between the intermediate support and the moveable squab element, the second linkage interconnecting the moveable squab to the intermediate support, moveable from a retracted position to an extended position and operable to affect vertical adjustment of the moveable squab relative to the intermediate support; a first locking mechanism to lock the first linkage in its extended position; a second locking mechanism to lock the second linkage in its extended position; a first actuator for releasing the first locking mechanism; and a second actuator for releasing the second locking mechanism; wherein the second actuator is a push button and a blocking element is provided to block actuation of the push button, the blocking element being mounted to move in response to movement of the first linkage, to be positioned to block movement of the push button when the first linkage is in the retracted position and to permit movement of the push button when the first linkage is in the extended position.