DEVICE FOR DETACHABLY FIT TOOL TO MACHINE SPINDLE Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: device is intended for fitting a tool in metal working machine spindle provided with precision hole concentric relative to the spindle axis. It has a precision journal entering the precision hole and is provided with two clamping pins mounted in the journal to move radially in opposite directions, with clamping member adopted to be displaced axially with the aid of clamping mechanism situated on the spindle side, with two wedge-shaped surfaces positioned from one side on the clamping member and from the other side on the clamping pin, inclined relative to the spindle axis and mating each other by pairs for radial displacement of the clamping pin between the released and clamped positions. To enable fitting of big tools with considerable clamping force even in case of relatively short axial path for the clamping mechanism situated on the spindle side, it is foreseen in the invention that the wedge-shaped surfaces of the clamping member and the clamping pin are provided with a groove limited by lateral sides. This groove divides the wedge-shaped surfaces respectively into two partial surfaces positioned at a definite distance from each other. With the device in the released position one partial surface comes in engagement with the opposite lateral groove following the pattern of gearing and with the device in the clamped position both wedge-shaped surfaces mate each other by pairs. EFFECT: improved reliability. 24 cl, 11 dwg