Patent ID: 8376342

Claim:
A clamping device comprising: at least one elastic element comprising a first end and a second end; a first barrel attached to the first end of the at least one elastic element and comprising a plurality of first clamping portions, a plurality of first slots, and a first receiving space, the first clamping portions and the first slots being alternately arranged around the first receiving space; and a second barrel attached to the second end of the at least one elastic element and received in the first receiving space, the second barrel comprising a plurality of second clamping portions corresponding to the first clamping portions, a plurality of second slots, and a second receiving space, the second clamping portions and the second slots being alternately arranged around the second receiving space, the second barrel being rotatable relative to the first barrel in the first receiving space between a first position where the at least one elastic element is in a relaxed state and the second clamping portions are close to the corresponding first clamping portions, and a second position where the second clamping portions are further from the respective first clamping portions and the at least one elastic element applies a torsional force on the first barrel and the second barrel to force the first clamping portions to move toward the corresponding second clamping portions.