Radial arm saw

Claim 1

IN A RADIAL ARM SAW COMPRISING A BASE, A GENERALLY PLANAR TABLE ON SAID BASE FOR THE SUPPORT OF A WORKPIECE, A VERTICAL COLUMN SUPPORTED BY SAID BASE, A RADIAL ARM SUPPORTED BY SAID COLUMN, AND A CARRIAGE SUPPORTED BY SAID RADIAL ARM AND MOVABLE LONGITUDINALLY THEREOF, THE IMPROVEMENT COMPRISING A POWER UNIT HAVING A GENERALLY CYLINDRICAL HOUSING, AN ARM DEPENDING DOWNWARDLY FROM SAID CARRIAGE HAVING A CONTRACTIBLE RING ENGAGEABLE ABOUT THE HOUSING OF SAID POWER UNIT SAID POWER UNIT HAVING AN ARMATURE AT ONE END ROTATABLE ABOUT THE CENTRAL AXIS THEREOF AND A TOOL HOLDING ARBOR AT THE OTHER END THEREOF ROTATABLE ABOUT AN AXIS GENERALLY NORMAL TO THE AXIS OF THE ARMATURE, SAID POWER UNIT BEING ROTATABLE ABOUT ITS CENTRAL AXIS WITHIN THE CONTRACTIBLE RING ON SAID ARM TO VARY THE ANGULAR RELATIONSHIP BETWEEN THE CENTRAL AXIS OF SAID TOOL HOLDING ARBOR AND THE PLANE OF SAID TABLE, THE RING ON SAID CARRIAGE ARM ENCIRCLING SAID HOUSING BETWEEN THE ARMATURE AND THE ARBOR OF SAID POWER UNIT.