Patent ID: 7249936

Claim:
A dual capacity compressor, comprising: a power generating part, comprising a reversible motor and a crank shaft coupled to the motor; a compression part, comprising a cylinder, a piston configured to be inserted into the cylinder, and a connecting rod configured to connect to the piston; a crank pin positioned eccentric to a center of the crank shaft; an eccentric sleeve configured to be rotatably installed between the crank pin and an end of the connecting rod; and a key member configured to cause the eccentric sleeve to be completely caught with respect to at least one of a plurality of elements of the compressor which are positioned proximate the eccentric sleeve during both clockwise and counter clockwise rotation of the motor, wherein a compression capacity is varied based on a position of the eccentric sleeve as a direction of rotation of the motor is changed, and wherein the key member is configured to prevent relative movement of the eccentric sleeve and the at least one of the plurality of elements of the compressor during operation regardless of the direction of rotation of the motor.