STRUCTURE OF ARM WITH SINGLE DEGREE OF FREEDOM

摘要

PURPOSE:To obtain a degree of freedom arm structure at a Low cost with less number of components in which the possibility of a damage to a joint is precluded by fitting a couple of left right disk shaped shafts to a semi-circular bearing respectively in 1st and 2nd arms so as to form a joint folded in a same plane. CONSTITUTION:A disk shaped shaft 50-l is fitted to a semi-circular bearing 40-1 and a disk shaped shaft 50-2 is fitted to a semi-circular bearing 40-2 respectively in 1st and 2nd arms 10, 20 to form a joint folded in a same plane. Through the constitution above, the disk shaped shafts 50-1,50-2 are fitted to the semi-circular bearings 401, 40-2 definitely and an approaching force is provided to the 1st arm 10 and the 2nd arm 20 by a tensile coil spring 60 and a proper friction is exerted to a slide face between the disk shaft and the semi- circular bearing, then the arms are folded within a desired angular range and its folded angle is maintained. Thus, the possibility of a damage to the joint is precluded, and number of components for the joint is less, then the single degree of freedom arm structure is obtained at a low cost.