| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a movable arm which has an extended service life and its design method. <P>SOLUTION: The movable arm is composed of a base 1 for fixing at a fixing face, a movable unit 2 which is fitted rotatable in changing a gravity position against the base 1 and on which a supported object is fixed, and a returning unit 3 which is energized in a direction of returning the movable unit 2 at a predetermined position against the base 1. Irrespective of a position of the movable unit 2 against the base 1, an elastic modulus of the returning unit 3 and a deformation degree of the returning unit 3 at the returning position and dimensions of each part are determined so that a gravity toward the movable unit 2 and an energized force by the returning unit 3 may be balanced. Since the position of the movable unit 2 is maintained, not by an abrasion force, but by an elasticity of the returning unit 3, a service life can be extended more than the case in which the position of the movable unit 2 is maintained by an abrasion force since there is hardly any effect from abrasion. <P>COPYRIGHT: (C)2007,JPO&INPIT |
