A three-wheeled cart includes a frame body whose rear portion is supported by a pair of rear wheels. An inclined, elongated U-shaped tube which has an upper handle portion and a lower turnable transverse connecting tube is pivoted to the frame body. A front fork member carrying a front wheel is attached...http://www.google.com/patents/US4934728?utm_source=gb-gplus-sharePatent US4934728 - Folding cart
