After the turning operation halfway (assignment) relative to the movable body toward a position may be automatically rotated to simply configure the operating mechanism to the movable body to the reference position, and also to be installed in positions inconspicuous. ; (Solving means), arm (5) has a slider (6) for the second of paper strength in a direction away from the pivot axis (3) action. Cam 4 has pivot shaft (3) has a forward cam surface 41 on the side of that and, at the same time, the forward cam surface 41 has acid (山) having a top portion (41a) projecting toward the pivot axis (3) It is formed to a shape. The movable body (2) is positioned on the leading-end of the forward cam face portion 41 of when in the deployed position slider 6 actors (6c) the cam (4) is installed on, and the movable body (2) when in the standard position the actors (6c) that is shot by the second strength to be in contact with the end (41c) of the forward cam face portion 41. Actors (6c) that is the top portion toward the base of the movable body (2) position to a position over ride (41a) after the turning operation is movable by a second series strength member (2) is to automatically rotated to the reference position .
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