STOWED PLATFORM WHEELCHAIR LIFTER

摘要

A wheelchair platform free fall control system having a tension means biasing together the long (20, 20') and short arms (24, 24') of a lever arm assembly (14, 14') that keeps the lever arm slide block (42, 42') in contact with a lifting arm (30, 30') during gravity-down deployment of the platform (12) from an over-vertical stowed position to a horizontal transfer position. The tension means may be one or more springs (60, 60') and a compression means may be a gas spring (52). The forces are preselected to provide an over-vertical assist while keeping the slide block (42, 42') in contact with an arm (20, 20') of the lifting assembly (14, 14').