Quick change jaw system for chucks

A quick change jaw assembly for a chuck having a rotational axis comprising:

• a master jaw configured for mounting to the chuck for movement toward and away from the rotational axis, the master jaw including a first pair of coplanar abutment surfaces defining a first aperture, the first pair of coplanar abutment surfaces include serrations;
• a clamping device including a dovetail portion and at least one ring member extending from the dovetail portion, the at least one ring member being disposed in the first aperture of the master jaw, wherein the dovetail portion rests above the first pair of coplanar top surfaces of master jaw;
• a top jaw formed with a groove longitudinally extending along a length of the top jaw, the groove being complementary to the dovetail portion and configured for engaging the dovetail portion, the top jaw including a second pair of coplanar abutment surfaces extending along opposite sides of the groove, the second pair of coplanar abutment surfaces include serrations complementary to the serrations of the first pair of coplanar abutment surfaces;
• and
• a cam disposed in the master jaw for actuating the clamping device for urging the second pair of coplanar abutment surfaces of the top jaw into coengagement with the first pair of coplanar abutment surfaces of the master jaw, the cam being formed with a first cylindrical portion and a second cylindrical portion positioned eccentric from each other along a central longitudinal axis of the cam, the first and second cylindrical portions of the cam being disposed within the at least one ring member of the clamping device, wherein the cam is accessible externally from a single, second aperture in the master jaw for actuation,
• wherein the top jaw is variably positioned along the master jaw.

A quick change jaw assembly for a chuck having a rotational axis comprising:

• a master jaw configured for mounting to the chuck for movement toward and away from the rotational axis, the master jaw including a first pair of coplanar abutment surfaces defining a first aperture, the first pair of coplanar abutment surfaces include serrations;
• a clamping device including a dovetail portion and cylindrical member extending from the dovetail portion, the cylindrical member being disposed in the first aperture of the master jaw, wherein the dovetail portion rests above the first pair of coplanar top surfaces of master jaw;
• a top jaw formed with a groove longitudinally extending along a length of the top jaw, the groove being complementary to the dovetail portion and configured for engaging the dovetail portion, the top jaw including a second pair of coplanar abutment surfaces extending along opposite sides of the groove, the second pair of coplanar abutment surfaces include serrations complementary to the serrations of the first pair of coplanar abutment surfaces;
• and
• a cam disposed in the master jaw for actuating the clamping device for urging the second pair of coplanar abutment surfaces of the top jaw into coengagement with the first pair of coplanar abutment surfaces of the master jaw, the cam being generally cylindrical and hollow with a rectangular aperture for receiving the cylindrical member of the clamping device, wherein the cam is accessible externally from a single, second aperture in the master jaw for actuation,
• wherein the top jaw is variably positioned along the master jaw.