Portable rotary power tools

Claim 1

A PORTABLE POWER TOOL COMPRISING A POWER ASSEMBLY INCLUDING A ROTARY MOTOR HAVING AN OUTPUT SHAFT, POWER TRANSMISSION MEANS HAVING A SUPPORT ARM FIXED RELATIVE TO SAID MOTOR, AND EXTENDING GENERALLY RADIALLY OUTWARDLY FROM SAID OUTPUT SHAFT, A ROTARY CHUCK AT THE END OF SAID ARM DISTAL THE OUTPUT SHAFT, DRIVE MEANS DRIVINGLY CONNECTING SAID OUTPUT SHAFT WITH SAID CHUCK, AND A HANDLE EXTENDING GENERALLY PERPENDICULARLY FROM SAID MOTOR, AND INCLUDING A FINGER OPERATED ON-OFF CONTROL FOR SAID MOTOR; A REMOVABLE ROTARY TOOL OF CYLINDRICAL PROPORTIONS HAVING TWO COAXIAL END SUPPORTS, AT LEAST ONE OF WHICH IS ENGAGEABLE WITH SAID CHUCK; AND A REMOVABLE SHIELD FOR ENCLOSING A SUBSTANTIAL PORTION OF SAID TOOL AND INCLUDING PARALLEL FIRST AND SECOND END WALLS, SAID FIRST END WALL INCLUDING AND OPENING, AND SAID POWER TOOL FURTHER COMPRISING MEANS FOR RIGIDLY, BUT REMOVABLY, SECURING SAID FIRST END WALL, AND IN THAT MANNER THE SHIELD, TO THE SUPPORT ARM, IN A POSITION WITH THE OPENING IN SUCH WALL IN REGISTRY WITH THE CHUCK, AND MEANS CARRIED BY THE SECOND END WALL OF THE SHIELD FOR JOURNALING THE END SUPPORT AT THE END OF THE ROTARY TOOL DISTAL THE CHUCK.