Automatic balancing structure of medical balancing stand

An automatic balancing structure of a medical balancing stand, the medical balancing stand having a first arm and a second arm, the second arm being turnable about a turn shaft that is horizontally fixed relative to the first arm, a first end of the second arm supporting a load, a second end of the second arm having an adjustment unit to balance the second aria on the turn shaft, the automatic balancing structure comprising:

• a lever fixed through the turn shaft relative to the second arm and having a contact part at a front end thereof;
• a turn plate rotatably fixed to the turn shaft and having a pair of stoppers arranged on each side of the contact part with a predetermined clearance from the contact part;
• a contact detector arranged on the pair of stoppers and outputting a balance information signal to the adjustment unit according to a contact state with the contact part;
• a clutch unit that is fixed to the first arm and engages with a part of the turn plate to lock the turn plate;
• and
• an elastic member arranged in each of the clearances and having an elasticity to deform on receiving pressure caused by an imbalance occurring on the second arm, wherein
• in a normal state, the turn plate turns with the lever through the elastic members,
• in a balance adjusting state, the clutch unit locks the turn plate and the contact part deforms the elastic member to activate the contact detector so that the contact detector outputs the balance information signal to the adjustment unit and the adjustment unit balances the second arm according to the balance information signal.