Clamping device

A clamping apparatus for use in clamping a member, the clamping apparatus comprising a support member for supporting the member to be clamped at a predetermined position, a mounting member attached to the support member, a clamp arm attached to the mounting member to be able to reciprocate with respect to the mounting member, a pressure applying mechanism, which is located between the mounting member and the clamp arm and applies pressure to the clamp arm, and a clamp bolt, which is located on the clamp arm and clamps the member to be clamped between the clamp bolt and the support member,

• wherein a groove is formed in the clamp arm, the clamp bolt is attached to the guide groove such that the position of the clamp bolt is adjustable,
• wherein the clamp bolt is inserted in the guide groove, a first lock nut and a second lock nut are screwed to the clamp bolt to sandwich the clamp arm from above and below, and the clamp bolt is secured at a predetermined position of the clamp arm by securely tightening the first lock nut and the second lock nut to the clamp arm,
• wherein an upper washer is located between the clamp arm and the first lock nut and a lower washer is located between the clamp arm and the second lock nut, the upper washer and the lower washer each have a rotation restricting rib, the rotation restricting ribs are engaged with the upper and lower rims of the clamp arm for restricting rotation of the upper washer and the lower washer,
• wherein the second lock nut is fixed to the lower surface of the lower washer, and
• wherein a manipulation portion is provided on the clamp bolt above the clamp arm, the manipulation portion being used for rotating the clamp bolt in a state where the member to be clamped is clamped between the clamp bolt and the support member.