Patent ID: 7153133

Claim:
A disposable prophy angle adapted to be mounted to an electric tooth polisher, the electric tooth polisher having a controller connected to a power source, a handle connected to the controller through a cable and having a motor and a polishing head mounted to the disposable prophy angle, wherein the disposable prophy angle comprises: a body adapted to be mounted to the handle and having a cavity defined in the body; a proximal open end communicating with the cavity; a distal open end communicating with the cavity; and a bent distal segment bent at an angle; and a transmission assembly mounted in the cavity in the body, adapted to be driven by the motor and having a driving shaft mounted rotatably in the cavity in the body and having a proximal end adapted to be connected to the motor; a distal end; and multiple mounting holes defined longitudinally in the distal end of the driving shaft; a head mount mounted rotatably in the cavity of the body, corresponds to the bent distal segment and having a proximal end; a distal end extending out of the distal open end of the body and adapted to be mounted detachably the polishing head; and multiple mounting holes defined longitudinally in the proximal end of the head mount and corresponding to the mounting holes in the driving shaft; and multiple bent linkage shafts being rigid and inflexible, mounted in the cavity, corresponding to the bent distal segment of the body and rotatably and slidably connected to the driving shaft and the head mount, and each linkage shaft having two segments formed with each other at an angle corresponding to the angle of the bent distal segment of the body and rotatably and slidably extending into a corresponding mounting hole in the driving shaft and a corresponding hole in the head mount, respectively.