Crank shaft

A crank shaft for converting rotating movement into reciprocating movement of a reciprocatable element, comprising:

• a rotation shaft for inducing the rotating movement;
• a crank arm connected to said rotation shaft at the center of the crank arm and having a guide groove at one side;
• a crank pin movable in a reciprocating manner in said guide groove in response to the rotating movement to move the reciprocatable element;
• and
• elastic means for elastic support of said crank pin in said guide groove.

A crank shaft for converting rotating movement into reciprocating movement of a reciprocatable element, comprising:

• a rotation shaft for inducing the rotating movement;
• a crank arm connected to said rotation shaft at the center of the crank arm and having a guide groove at one side, said guide groove leading from a first point on an inner circle to a second point on an outer circle, both circles being centered on the center of the crank arm;
• a crank pin movable in a reciprocating manner in said guide groove in response to the rotating movement to move the reciprocatable element;
• and
• elastic means for elastic support of said crank pin in said guide groove.

A reciprocating compressor comprising:

• a motor for creating rotating movement;
• a crank shaft which has a rotation shaft fixedly provided in the center of said crank shaft and connected to said motor, a guide groove provided leading from an inner circle to an outer circle placed at different distances from the center of the crank shaft, elastic means for elastic support in said guide groove and a crank pin movable in a reciprocating manner in said guide groove according to the rotating direction of the rotation shaft;
• a piston connected to said crank pin with an interval via a connecting rod to perform linear reciprocating movement;
• and
• a cylinder having an internal space for sucking and compressing fluid according to the linear reciprocating movement of said piston.