Patent ID: 8534166

Claim:
A screwdriver for an inherent tool bit set comprising: a screwdriver device having an accommodating portion at one end thereof, a plurality of accommodating rooms formed on the accommodating portion for receiving a tool bit set, at least one spring room deposited on the accommodating portion, a working shaft at another end of the screwdriver device; a cover member having a receiving space at one end thereof for receiving the accommodating portion of the screwdriver device, at least one through hole opened on the cover member, the through hole communicated with the receiving space and corresponding to the spring room; at least one control set assembled between the spring room and the through hole, the control set having a spring and a driving block, the spring disposed between the spring room and the driving block, at least one button room defined in the cover member, the button room communicated with the through hole; an elastic member placed into the button room, a pushing block formed at one end of the elastic member and corresponding to the through hole, the pushing block against and above the driving block; and at least one locking hole opened on the button room, a button shield assembled to the button room and above the elastic member, at least one finger deposited at the button shield, the finger locking into the locking hole; wherein a user presses the control set into the spring room for separating the cover member from the screwdriver device and takes a tool bit to assemble to the working shaft for screwing or loosing bolts.