| 摘要 |
Arm holder pieces are separated in the form of a wedge at their coupling portion and coupled by a thin portion to constitute a hinge. A hard adjusting band one end of which is adhered or welded to the arm holder piece is projected toward the arm holder piece side on the coupling portion of the arm holder pieces. The other end of the hard adjusting band is fixed at a thread fastening portion of the arm holder piece. The hard adjusting band has a slide hole so as to be fastened at a free position by a thread. With this structure, the arm holder pieces are adjusted to an arbitrary angle and fixed thereat. <IMAGE> |
