US Patent 9504297 Foldable chair

A foldable chair includes a stick shank, a collar sleeve movable between distal and proximate positions on the stick shank, a carrier sleeved on the stick shank, and a seat unit. The seat unit includes a middle portion pivotally connected to the collar sleeve, and left and right wing portions hinged to the middle portion. When the collar sleeve is displaced from the distal position to the proximate position, the seat unit is convertible from a use state, where middle portion is coplanar with the left and right wing portions, to a collapsed state, where the middle portion is at an included angle with each of the left and right wing portions.