Patent ID: 9028295
Filing Date: 2015-05-12
Classification: B24B

Abstract:
1. A grinder apparatus for grinding the backside of the blades on a reel mower for cutting grass, the grinding apparatus comprising: means for applying controlled torque to the reel mower and its cutting blades; a rotatable grind-stone; means for rotating the grind-stone; a carriage for supporting the grindstone and moving the grind-stone from right to left or vice versa along the blade on the mower to allow the grindstone to sharpen the back side of each blade; a rest for holding a blade of the mower in a position against the grind stone for grinding the back side of the blade; means for releasing the grindstone from the blade allowing the reel to rotate to the next blade, which in turn a relief grind is ground into the back side of the next blade, and sequentially ground into all of the other blades on the apparatus; means for limiting the traverse of each of the blades during the relief grinding operation on both the right and left ends of each blade on the reel; sensing means to determine how far the right and left ends of the reel are on the right and left ends of the carriage; means to transmit the information to means for stopping the traversing of the reel beyond those set limits on both the right and left side of each blade so as to calculate the stop of the traversing and grinding of each blade that exceed any of those limits; and, an electric actuator connected to a plunger in contact with the rest, the electric actuator being configured to pull the plunger away from the reel to allow the reel to rotate to advance the next blade towards the grinding position, and the electric actuator being in contact with the sensing means to insure the grinding of the relief angle in the blade to each end of the blade.