Pneumatically operated debris-removable grinding tool

An improved pneumatically operated debris removing grinding tool, comprising:

• a main body being provided with an upper chamber and a handle in which are disposed an air inlet duct and an air outlet duct;
• a pneumatic motor disposed in said upper chamber having a driving shaft extended therefrom;
• a lower chamber being removably secured to said main body by fastening means with a flexible rubber skirt attached thereto;
• an upper and a lower debris intaking wheel;
• an air guiding disc sandwiched between said upper and lower debris intaking wheels that are housed in said lower chamber with said driving shaft going therethrough;
• a cushion ring removably attached to the bottom of said lower chamber and in supporting abutment against said air guiding disc;
• a partition mount having a plurality of through holes disposed on the periphery thereof and a shaft mounting hole disposed at the center thereof into which said driving shaft is inserted and fixed to said driving shaft;
• a fixing block removably secured to said partition mount by fastening means;
• a circular grinding plate removably secured to said fixing block being provided with a plurality of through holes thereon through which debris particles can pass;
• said lower chamber associated with said flexible skirt;
• and a through hole in communication with an end port of said air outlet duct being disposed at the top of said lower chamber;
• said pneumatic motor being provided with a driving shaft and a number of air inlet pores and an air outlet slot thereon;
• said outlet slot communicating with a thin tube having a diameter smaller than said end port of said air outlet duct so that when high pressure air passes through said air outlet slot and said thin tube and enters said end port of said air outlet duct, a vacuum state will be generated thereat;
• each of said upper and lower debris intaking wheels being provided with an upper plate and a lower plate with a plurality of vertically disposed arcuate partition members located therebetween that are equally spaced so as to form a plurality of spacings accordingly;
• said upper and lower debris intaking wheels being securedly engaged with said driving shaft of said pneumatic motor;
• whereby as said pneumatic motor is actuated to rotate by high pressure air introduced through said air inlet duct, said upper and lower debris intaking wheels are made to move accordingly so as to suck grinding debris particles into said lower chamber via said through holes on said grinding plate and along the periphery thereof and then via said through holes and along the periphery of said partition mount;
• and further via said lower debris intaking wheel and said air guiding disc which is retained in place without rotation and then said upper debris intaking wheel and the debris particles being finally delivered to said through hole disposed at the top of said lower chamber and communicating with said end port of said air outlet duct at which location said debris particles are sucked out by vacuum produced as a result of the high pressure air coming out of said thin tube slowing down thereat.