Patent ID: 7434857

Claim:
A chuck device for containers comprising: a supporting structure; a pair of arms rotatably supported on said supporting structure by way of a pair of arm shafts, chuck claws for grasping a container being disposed on ends of said pair of arms that open and close in tandem with a rotation around said arm shafts; and an operation member capable of being externally operated; wherein: inward from said pair of arms is disposed a first drive section capable of integrally rotating around said arm shaft of a first arm and being integral with said first arm, and a second drive section disposed further toward said end of said arm than said first drive section and capable of rotating integrally around said arm shaft of a second arm and being integral with said second arm; a biasing mechanism which biases said pair of arms around said arm shafts in a direction of closing said ends of said arms; a motion input mechanism disposed between said operation member and said first drive section which converts motion accompanying external operation of said operation member to a rotation motion of said first drive section centered around said arm shaft; and a coupling mechanism disposed between said first drive section and said second drive section which converts rotational motion of said drive section around said arm shaft to a rotational motion of said second drive section around said arm shaft.