Grinder apparatus with pollution control fluid dispensing means

Abstract

A hand-held grinder including a motor, a motor output shaft and a grinding tool mounted on the motor output shaft. Water is supplied from a source through a port into a sealed annular chamber surrounding the output shaft. A bore extends concentrically through the shaft between a point adjacent the annular chamber and the end of the shaft remote from the motor. Communicating bores extend radially through the shaft and through a collar keyed to the shaft from the concentric bore to the annular chamber. Additional bores, adjacent the end of the shaft remote from the motor, provide communications between the concentric bore and the outside of the shaft. Preferably, the sum of the cross-sectional areas of these last-mentioned bores is relatively less than the cross-sectional area of the concentric bore. Water dispensed through these communicating bores is atomized by rotation of the motor output shaft and grinding tool. The atomized water particles are directed toward the work piece upon which the grinding operations are being performed to capture respirable micron and sub-micron sized particulate contaminants generated by such grinding operations. In other embodiments of the invention, nozzles are provided to atomize the water. The nozzles are located adjacent the grinding tool. Desirably, the nozzles are flexibly mounted so that they can be aimed at the region of the grinding tool at which the particulate contaminants are being generated. In one of the atomizing nozzle embodiments, the motor is an air motor and exhaust air from the motor is used to atomize the water in the nozzle.