Patent ID: 7765642

Claim:
Operation mechanism for attaching a movable member to a main body rotatably between a first position and a second position, and holding the movable member in the first position by locking means, comprising: a base attached to the main body, a contact portion attached to the movable member, a coil spring having a winding portion with one end and the other end, said one end being fixed to the base and the other end being attached to the contact portion, said the other end being rotatable relative to the winding portion and rotating the movable member in the first position toward the second position, and a transfer track formed at the base and engaging the contact portion, said transfer track and said the other end of the coil spring being arranged to move the contact portion such that the movable member in the first position is moved to a predetermined position by said the other end by a force accumulated on the spring, and after the movable member passes the predetermined position in a direction to the second position, the winding portion of the coil spring again stores a force from the predetermined position to the second position by said the other end to reduce a movement speed from the first position to the predetermined position.