Patent ID: 7385127

Claim:
An angle adjustor for attachment to a musical instrument support for supporting a musical instrument and adjusting angular position of the musical instrument, the adjustor comprising: a fixed member connectable to the support; a movable member connectable to the musical instrument and arrangable facing the fixed member in a manner rotatable relative to the fixed member, the movable member being rotatable to enable adjustment of the angular position of the musical instrument; a rotation shaft rotatably connecting the movable member to the fixed member; at least two friction plates, through which the rotation shaft is inserted, arranged between the fixed member and the movable member; two pressing members for restricting rotation of the friction plates relative to the movable member and the fixed member with a first force acting in a direction parallel to an axis of the rotation shaft and for pressing the friction plates against the fixed member and the movable member using a second force applied in a rotation direction of the movable member to prohibit movement the friction plates; two fasteners, arranged parallel to the axis of the rotation shaft, for respectively fastening the pressing members to the fixed member and the movable member with the first force, wherein the second force is generated from the first force when the pressing members are fastened to the movable member and the fixed member by the fasteners; and a fastening member for fastening the movable member to the fixed member to press the friction plates against one another between the movable member and the fixed member and for adjusting force that fastens the movable member to the fixed member, wherein each friction plate includes a disk and a tab, with the tab radially extending from the disk, wherein the fixed member and the movable member each have a notch for receiving the tab and a corresponding one of the pressing members, and each pressing member holds and prohibits movement of the tab of the friction plate in the corresponding notch.