... or screws, to overcome the deficiencies of existing technologies. The Joint of the utility model, including a chimeric structure of the ... of the left and right sets of surface contact between pin and hole positioning. Resolved by plate-based products in factory ... , 4, eccentric gear, 5, lift plate, 6, helical gear, 7 pin, 8, positioning holes, 9, plywood, 10 journal sets, 11, spiral ...