Rotational tool locking device

A rotational tool locking device, comprising:

• a handle having two ears extending from one end thereof, a receiving slot formed between the two ears, a lateral hole defined in a periphery of the handle and located close to the receiving slot, a connecting hole defined in a bottom of the receiving slot and communicating with the lateral hole;
• a drive head having a connecting part formed at one end thereof that fits into the receiving slot, a pivot passing through the two ears and the connecting part, multiple teeth formed around a periphery of the connecting part;
• a locking assembly located in the connecting hole and including a spring and an actuating member, two ends of the spring biased between an inner bottom of the connecting hole and the actuating member respectively, one end of the actuating member having a stopping tooth that is engaged with the teeth, the actuating member having an arc groove located corresponding to the lateral hole, the arc groove having an arc groove top surface and an arc groove bottom surface defined in an inner wall thereof, the inner wall of the arc groove being concave from a direction of the pivot toward the direction of the spring, and
• an operating button slidably inserted in the lateral hole, one end of the operating button having a pushing part that pushes against the inner wall of the arc groove, the pushing part having a pushing arc surface that abuts against the inner wall of the arc groove, when the operating button is not pressed, the pushing arc surface and the arc groove bottom surface form a first gap, and when the operating button is pressed, the pushing part and the arc groove top surface form a second gap.