Patent ID: 7921753

Claim:
A screw locking tool comprising a main body provided with a shank and a sleeve, said shank having front end continually connected with said sleeve, said sleeve formed with a central accommodating cavity axially formed in an interior and an annular recess fitted therein with an O-shape ring, said annular recess bored with insert holes communicating with said accommodating cavity, each said insert hole having a positioning steel ball fixed therein, said accommodating cavity having an elastic element disposed therein; a screwing element received in said accommodating cavity of said sleeve, said screwing element formed with a shank, said shank disposed with an annular recess for matching with operation of said positioning steel balls of said sleeve, said screwing element provided with a receiving groove for receiving a screw head, said receiving groove having an annular wall bored with insert holes respectively for fixing a positioning steel ball therein, said annular wall of said receiving groove disposed with an annular recess fitted therein with an O-shaped ring, said O-shaped ring restricting a moving distance of said positioning steel balls and preventing metal filings from being accumulated in said accommodating cavity of said sleeve; and said positioning steel balls in said receiving groove of said screwing element respectively engaged in recessed slots of a screw head when said screw head is combined with said receiving groove of said screwing element, said screwing element able to completely fix a screw in place to let said screw not slip off.