PARALLEL OPENING AND CLOSING TYPE CHUCK HAND

PROBLEM TO BE SOLVED: To provide a parallel opening and closing type chuck hand capable of grasping a workpiece having an inside diameter part such as a circle and eclipse, enhancing bending strength of a grasping claw, and securing a necessary clearance with the inside diameter part even when grasping the workpiece of large weight.SOLUTION: The parallel opening and closing type chuck hand has a pair of support members 12, 14 opened and closed between an opening position and a closing position in parallel, and a wide grasping claw 16 and a narrow grasping claw 18 cantilever-supported on the support member. The wide grasping claw 16 has a circular-arc cross sectional shape in which both width-directional ends 16a, 16b are brought into contact with inner circumferential faces 6, 7 of the inside diameter part at the opening position, and an intermediate part extends along the circumferential face and has a recess part 16c curved outward. The narrow grasping claw 18 has a cross-sectional shape fitted to the recess part 16c of the wide grasping claw 16 at the closing position.