Patent ID: 6862765

Claim:
A tool including: a tool bit including a working head formed at an end, an insert formed at an opposite end and at least one annular groove defined in the insert; a handle including a grip formed at an end, a socket defining a cavity for receiving the insert and a joint via which the socket is connected with an opposite end of the handle; and a locking device for locking the insert in a releasable manner, wherein the locking device includes: a tunnel defined in the joint so that an axis of the tunnel is parallel to that of the cavity; a latch defining at least one notch, the latch being movable in the tunnel between a locking position and a releasing position; at least one truncated conical hole through which the cavity is communicated with the tunnel, the at least one truncated conical hole including a first end at the cavity and a second end at the tunnel, the first end thereof being smaller than the second end thereof; and at least one ball trapped in the at least one truncated conical hole, wherein the at least one ball is pushed partially into the at least one groove by means of the latch in the locking position and is allowed complete removal from the at least one groove in the releasing position, wherein the insert defines two annular grooves, and the locking device includes two balls and two truncated conical holes corresponding to the grooves, and the latch defines two notches corresponding to the truncated conical holes.