Extension arm for keyboard has upper arm rotatably connected to support by first pivot, side arm rotatably installed on support by second, support mounting rotatably connected to upper arm by third and to side arm by fourth pivot

摘要

The extension arm for a keyboard has a fastening support (10) for attachment to a plate, an upper arm (20) rotatably connected to the support by a first pivot pin (a), a side arm (30) rotatably installed on the two sides of the support by a second pivot pin (b), a support mounting (40) rotatably connected to the upper arm by a third pivot pin (c) and rotatably connected to the side arm by a fourth pivot pin (d). The first, second and third pivot pins are rotatably mounted in fixed areas to enable a deflecting movement.