Patent ID: 6923416

Claim:
An adjustable device in combination with a musical keyboard stand, wherein the keyboard stand comprises: a first stand having a first pivot hole defined through the first stand; a second stand having a second pivot hole defined to correspond to and aligned with the first pivot hole to allow a pivot to extend through the aligned first and second pivot holes to unite the first and second stands; the adjustable device comprises: a first disk mounted on a side of the first stand to have a finger hole to movably receive therein a finger; a second disk mounted on a side of the second stand to combine the first disk and having multiple adjusting holes defined in a peripheral edge of the second disk to allow an extension of the finger; and a sliding plate sandwiched between the first disk and the second disk and movable between a first position where a free end of the finger is detachably engaged with a free end of the sliding plate and a second position where the free end of the finger is separated from the sliding plate and is received in a very last adjusting hole of the second disk, in which a relative angle between the first stand and the second stand is maximum.