Patent ID: 9224369
Filing Date: 2015-12-29
Classification: B23D,B24D,G10D,Y10T

Abstract:
1. A polishing tool used for providing frets, a fretboard or a fingerboard of a stringed instrument with a curve having altered degree of depression, comprising: a supporting strut, a handle attached to the supporting strut at an upper side of the supporting strut, and a bottom attached to the supporting strut at a lower side of the supporting strut; wherein the handle is provided with a mechanism to curve the supporting strut, an upper surface of the bottom is attached to the supporting strut, and a lower surface of the bottom is provided with a file or a polishing material, a thickness of the supporting strut is shorter than a distance between two neighboring strings of the stringed instrument, and a bar fixed to a side of the handle, wherein the handle is transformable by two mechanisms, a first mechanism being compression in a longitudinal direction caused by a force pulling the bar, and a second mechanism being a pressure caused by a force applied to the handle to form a curve in the bottom.