A manually-operated, height-adjustable, non-powered, mobile support for an assistive ergonomic chair intended to be used by a healthcare provider/carer to provide mobility for a disabled (often paediatric) patient. It consists of a framework on wheels with a chair/seat mount, a handlebar for the user to hold/push the assembly, and may include a brake; it includes a manually-powered (fully or hydraulically-assisted) chair lifting mechanism. It is not a wheelchair component.