| 摘要 |
PURPOSE: A keyboard supporting board on a chair is provided to fix the keyboard supporting board to the lower part of the chair regardless of the existence of the chair, easily be used by moving from side to side, easily be changed in a distance of a user and a height of the keyboard supporting part using the first and second rotating parts and be easily adjusted at a horizontal angle. CONSTITUTION: A keyboard supporting board on a chair comprises a horizontal supporting board(20), a first rotating part(30), a vertical supporting board(40), a second rotating part(50), a supporting tube and a sliding part. A horizontal supporting board is connected to a connecting plate(10) which is fixed to the lower part of the chair and extended horizontally. The first rotating part is fixed to the end of the horizontal supporting board by a controlling lever(31) which controls a horizontal angle. The vertical supporting board is fixed to the upper part of the first rotating part and extended horizontally. The second rotating part is fixed to the end of the vertical supporting board to control the angle of a supporting board(100). The supporting tube is fixed to the second rotating part to support the lower part of the supporting board. The sliding part is fixed to the supporting board and moves from side to side based on the supporting tube. |
