Auxiliary device for seating furniture, has support unit for supporting furniture seat on movable frame provided over ground frame so that effective length or width of support unit is adjustable

摘要

A support unit is provided on a movable frame which is moved relatively with respect to ground frame installed on floor, for supporting a furniture seat on the movable frame so that the effective length or width of support unit is adjustable. A drive unit displaces the movable frame with respect to ground frame.