Patent ID: 7300259

Claim:
A variable capacity rotary compressor, comprising: upper and lower compression chambers having different capacities; a rotating shaft passing through the upper and lower compression chambers; upper and lower eccentric cams provided on the rotating shaft; upper and lower eccentric bushes fitted over the upper and lower eccentric cams, respectively; a slot provided at a predetermined position between the upper and lower eccentric bushes; a locking pin, moving along the slot, to change a position of the upper or lower eccentric bush to a maximum eccentric position; and a clutch to engage with the slot at a position opposite to the locking pin, to prevent the upper and lower eccentric bushes from slipping over the upper and lower eccentric cams, respectively, wherein the rotating shaft comprises a through hole which is provided at a height corresponding to the slot, to allow the locking pin and the clutch to be placed in first and second ends of the through hole, respectively, the clutch comprises a clutch pin set in the second end of the through hole to reciprocate in a radial direction of the rotating shaft and an elastic member provided in the through hole to elastically biasing the clutch pin so that the clutch pin retracts into the through hole when the rotating shaft stops rotating, and the clutch pin comprises a body part having a diameter which is larger than a width of the slot, a locking part projected from an outside end of the body part, and having a diameter which is smaller than the width of the slot, and a first threaded part projected from an inside end of the body part.