Patent ID: 7367522

Claim:
A string fastening device comprising: a base with a tubular wall and two holes defined through the tubular wall, a tube extending from a top of the base and located in a space enclosed by the tubular wall, a connection flange extending inward from an inner periphery of the tubular wall and two pawls axially movably inserted into two receiving holes defined in a top of the connection flange, each pawl having an inclined top surface; a reel having a central hole through which the tube extends and the reel having a toothed ring connected on a top of the reel; a positioning ring fixedly connected on the connection flange to limit the reel to move in axial direction, two notches defined in an outer periphery of the positioning ring and the two pawls extending through the notches; a knob having a shaft extending from an underside thereof and the shaft movably inserted into an axial passage of the tube, a skirt portion extending from the underside of the knob and the shaft located at a center in a space enclosed by the skirt portion, a plurality of first teeth defined in an inner periphery of the skirt portion and engaged with the toothed ring on the reel, a plurality of second teeth defined in the underside of the knob and engaged with the inclined surfaces of the pawls such that the knob is rotated in one direction and stopped in the other direction by the pawls, the second teeth being disengaged from the pawls when the knob is pulled upward, and a string having two ends extending through the two holes in the tubular wall and secured to the reel, the string reeled on the reel.