Grinding machine

Claim 1

A MACHINE FOR REMOVING METAL FROM A WORKPIECE COMPRISING A CARRIAGE MOVABLE ALONG A PREDETERMINED PATH, LATERALLY SPACED, HORIZONTAL, PARALLEL TRACKS ON SAID CARRIAGE EXTENDING IN FORWARD AND REARWARD DIRECTIONS AT RIGHT ANGLES TO THE PATH OF MOVEMENT OF SAID CARRIAGE, A SADDLE MOUNTED ON SAID TRACKS FOR FORWARD AND REARWARD RECIPROCATION, A HORIZONTAL PIVOT SHAFT ON SAID SADDLE EXTENDING PARALLEL TO THE PATH OF MOVEMENT OF SAID CARRIAGE, A BOOM PIVOTED AT ITS REAR END TO SAID SHAFT FOR VERTICAL SWINGING AND EXTENDING FORWARDLY THEREFROM, A GRINDING WHEEL MOUNTED ON THE FORWARD END OF SAID BOOM FOR ROTATION ABOUT AN AXIS GENERALLY PARALLEL TO THE PATH OF MOVEMENT OF SAID CARRIAGE, MEANS FOR OSCILLATING SAID WHEEL THROUGH A LIMITED ARC ABOUT THE BOOM AXIS, A POWER MECHANISM PIVOTED ON SAID SHAFT AND HAVING AN OUTPUT PULLEY ABOVE THE LEVEL OF SAID SHAFT, A PULLEY ON THE FORWARD END OF SAID BOOM CONNECTED TO SAID GRINDING WHEEL, A BELT EXTENDING OVER SAID PULLEYS TO TRANSMIT ROTATION TO SAID GRINDING WHEEL FROM SAID POWER MECHANISM, SAID BOOM AND POWER MECHANISM BEING CAPABLE OF PIVOTING RELATIVE TO EACH OTHER ABOUT SAID SHAFT, SAID POWER MECHANISM BEING POSITIONED SO THAT ITS CENTER OF GRAVITY IS ABOVE AND REARWARDLY OF SAID SHAFT WHEREBY THE WEIGHT OF SAID MECHANISM WILL TENSION SAID BELT AND THE TENSIONING OF SAID BELT WILL URGE SAID BOOM UPWARDLY ABOUT SAID SHAFT.