Pneumatic handheld grinding apparatus

Abstract

A pneumatic handheld grinding apparatus includes a housing, a motor set received in the housing. A locking member is mounted to the housing to hold the motor set in place and a grinding disk is connected to the motor set so that the grinding disk is rotated when the motor is operated due to a compressed air.

1 . A pneumatic handheld grinding apparatus comprising: 
 a housing including a cavity longitudinally defined therein for receiving a motor set and a threaded portion formed on an inner periphery of the cavity near a bottom of the housing, a joint laterally extending from the housing and adapted to be connected to a compressed air source, a valve mounted in the joint for selectively allowing the compressed air flowing into the housing to operate the motor set, a lever pivotally mounted to the joint for actuating the valve;    the motor set including a motor received in the cavity and having a shaft longitudinally extending from the motor, a connector eccentrically securely mounted to a free end of the shaft and a grinding disk attached to the connector so that the grinding disk is rotated when the compressed air flows into the housing and operates the motor; and    a locking member securely mounted to the housing to hold the motor set in place, the locking member including a through hole centrally defined therein to allow the connector and the shaft of the motor set extending through the locking member when the locking member is mounted to the housing, a first skirt upwardly extending from the locking member and having a threaded outer periphery screwed onto the threaded portion of the housing and a top portion securely abutting the motor to hold motor set in place after the locking member screwed onto the housing.    
   
   
       2 . The pneumatic handheld grinding apparatus as claimed in  claim 1 , wherein the locking comprises a second skirt downward extending therefrom, the second skirt including an annular rib laterally outwardly extending from an outer periphery of the second skirt, a dust-proof cover attached to the second skirt and engaged to the annular rib to prevent the dust-proof cover from detaching from the locking member.  
   
   
       3 . The pneumatic handheld grinding apparatus as claimed in  claim 2 , wherein the locking member comprises a series of indentations defined in the outer periphery of the second skirt for user to easily mount the locking member to the housing.