US Patent 10293236 Direction indication device for golf putting

Disclosed herein is a direction indication device for golf putting. The device includes a scale plate, a left and right slope angle indication needle, an indication needle rotation means, a vertical slope angle scale means, and a lid provided over the scale plate. The indication needle rotation means includes a first rotation cam including a wedge pin closely coupled vertically to an elongated hole formed on one end of the left and right slope angle indication needle and maintained vertically in a direction of the central axis of the earth. The indication needle rotation means also includes an angle adjustment bar rotatably connected with the first rotation cam such that the first rotation cam is rotated from side to side and moves back and forth. Additionally, the indication needle rotation means includes a first supporting rod to support the angle adjustment bar and installed on the scale plate.