Universal bit adapter

A universal bit adapter comprising:

• an adapting member clamped in a tool having a shank hole longitudinally formed in the adapting member for inserting a tool bit into the shank hole and defining a longitudinal axis in said shank hole;
• a sleeve formed on a front portion of the adapting member;
• a control member pivotally mounted in a front portion of the sleeve having a central hole formed therein and defining an axis in the center of the central hole;
• and a tension spring resiliently held in the sleeve for tensioning a back portion of the control member for normally biasing the control member to allow the axis of the central hole to be eccentrically inclinedly intersected with the longitudinal axis formed in the shank hole in the adapting member for firmly dogging a shank portion of the tool bit in the central hole in the control member;
• said control member including:
• a pivot for pivotally mounting the control member in a socket of the sleeve, a back portion formed on a rear end of the control member to be urged by the tension spring as retained in the sleeve, said central hole longitudinally formed through the control member defining said axis axially at the center of the central hole, with the axis of the central hole in the control member normally eccentrically inclinedly intersected with the longitudinal axis in the shank hole of the adapting member with an acute angle when normally urging the back portion of the control member by the tension spring, a depressing portion formed on a first peripheral portion of the front portion of the control member, and a counter-weight portion formed on a second peripheral portion of the front portion of the control member opposite to the depression portion for dynamically balancing the control member when holding the tool bit therein for a rotation about the longitudinal axis of the adapting member;
• with the axis in the control member operatively aligned with the longitudinal axis in the adapting member upon an inward depression on the depression portion of the control member.