Patent ID: 6928700

Claim:
A rotating shaft with a locking device comprising: a cylindrical rod extending from the rotating shaft, the cylindrical rod having at least one flat miled face; and at least one friction part, each friction part having: i) a fitting part: ii) a circular section having a first end connected to the fitting part; iii) an arched section having a first end connected to the fitting part and the first end of the circular section; iv) an axial hole defined by the circular section and the arched section; and v) a gap located between a second end of the circular section and a second end of the arched section, the cylindrical rod being rotatably inserted through each axial hole, the arched section having a radius adjustable between a locked state and an unlocked state, wherein the second end of the arched section releasably engages the milled section of the cylindrical rod in the locked state and resiliently expands to engage an outer circumference of the cylindrical rod in the unlocked state as the cylindrical rod is rotated.