Vibration absorbing device for machine tools

Claim 1

MEANS FOR ALTERING THE DYNAMIC STIFFNESS OF A CYLINRICAL TOO-SUPPORTED MEMBER SUBJECT DURING OPERATION TO VIBRATION, SAID MEANS COMPRISING A FURTHER CYLINDRICAL MEMBER ARRANGD ABOUT THE SAME LONGITUDINAL AXIS AS SAID TOOL-SUPPORTING MEMBER, COMBINED SPRING AND DAMPER ELEMENTS FORMED OF HIGH-HYSTERESIS ELASTOMERIC MATERIAL INTEPOSED AND FORMING THE SOLE BRIDGING CONNECTION BETWEEN SAID TOOL-SUPPORTING MEMBER AND SAID OTHER CYLINDRICAL MEMBER, AND MEANS FOR DEFORMING SAID ELASTOMERIC MATERIAL TO ALTER THE STIFFNESS OF THE BRIDGING CONNECTION AND THUS ADJUST THE DEGREE OF ELASTIC COUPLING BETWEEN SAID SPRING AND DAMPER MEANS AND SAID CYLINDRICAL MEMBERS, SAID DEFORMING MEANS COMPRISING CONFINING MEMBERS CONFINING SAID ELEMENTS BETWEEN AN END SURFACE ON SAID FURTHER CYLINDRICAL MEMBER IN AN ANNULUS HAVING OPPOSING SIDE WALLS AND MEANS COUPLED BETWEEN SAID CONFINING MEMBERS AND SAID CYLINDRICAL MEMBER FOR PRODUCING RELATIVE AXIAL MOVEMENT THEREBETWEEN, THEREBY TO BULGE THE COMPRESSED MATERIAL IN A RADIAL DIRECTION INTO FIRMER CONTACT WITH THE VIBRATORY MEMBER TO BE DAMPED.