Abstract: A cushion structure for a motor vehicle seat including a retractable stop piece capable of preventing an object placed under the cushion from moving towards the front, and means capable of arranging said cushion in a position preventing a passenger from sitting on it.

Abstract: A pump mechanism for a vertical seat lift assembly includes a control handle pivotable in each direction from a neutral position, a stationary housing assembly, a rotatable drive member for operating the vehicle lift assembly, a clutch assembly operably connecting the drive member to the housing assembly to selectively permit rotation of the drive member relative to the housing assembly in either direction, and control assembly operably connecting the control handle to the clutch assembly to selectively rotate the drive member. The control assembly is located radially outward of the clutch assembly so that the control assembly does not increase the thickness of the pump mechanism.