Quick-change tool adapter

A quick-change adapter for affixing and precisely locating a working member such as a tool, a workpiece or the like upon a machining device, comprising:

• a first holder having a first surface including a first engagement portion:
• a second holder having a second surface including a second engagement portion and a portion defining an aperture through said second surface;
• a first means for affixing one of said working member and said machining device to said first holder;
• second means for affixing the other of said machining device and said working member to said second holder;
• a shank on said first holder extending from said first surface and dimensioned to be received in said aperture in said second surface;
• and
• means connected to said second holder for drawing on said shank so as to bring said first and second engagement portions into firm abutment against one another;
• wherein said first and second engagement portions are configured as helical face gears;
• wherein said shank includes an end opposite said first holder and a ramp surface tapering radially inwardly in the direction of an axis of said shank from said end and towards said first holder;
• and wherein said drawing means comprises at least three pins disposed on said second holder around said aperture and movable therein, each of said pins being abuttable against said ramp surface of said shank;
• and
• wherein said drawing means further comprises means on said second holder for biasing said pins away from said ramp surface of said shank, and a radially floating cam ring carried by said second holder disposed around said pins and said aperture, said cam ring including a cam surface against which said biasing means biases said pins;
• said second holder including a first facing portion facing towards said cam ring and said cam ring including a second facing portion opposite said first facing portion and radially spaced from said first facing portion, whereby rotation of said cam ring about said second holder causes said pins to abut said ramp surface of said shank while said cam ring is free to move radially with respect to said second holder during such rotation.