Patent attributes
A string pulling mechanism includes a rolling assembly, a rotary shaft, a unidirectional bearing, two rollers, a switch, and a swing lever. The holder has a first accommodation portion, an opening, and a first coupling orifice. The unidirectional bearing includes an internal ring and an external ring having multiple teeth, the two rollers are fixed on the rotary shaft, and the switch is inserted to the opening of the rolling assembly and is rotatably connected with the rolling assembly. The switch is received into the opening so as to control the external ring to rotate or not rotate. The swing lever disposed on a side of the rolling assembly to actuate the rotary shaft, the internal ring of the unidirectional bearing, and the two rollers to rotate. The string is fixed on the two rollers and are inserted through and connected with a pull seat.
