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An adjustable device includes 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

An adjustable device includes 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.

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1. 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 pivo

1. 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. 2. The adjustable device in combination with a musical keyboard stand as claimed in claim 1, wherein the free end of the finger is provided with a slanted face and the free end of the sliding plate is provided with a pyramidal head so that the engagement and separation between the free end of the finger and the free end of the sliding plate is expedited.3. The adjustable device in combination with a musical keyboard stand as claimed in claim 1, wherein the second disk has a first boss and a second boss spatially aparted from the first boss to respectively stop the movement of the sliding plate.4. The adjustable device in combination with a musical keyboard stand as claimed in claim 2, wherein the second disk has a first boss and a second boss spatially aparted from the first boss to respectively stop the movement of the sliding plate.5. The adjustable device in combination with a musical keyboard stand as claimed in claim 1, wherein a spring is mounted around the finger to facilitate the movement of the finger.6. The adjustable device in combination with a musical keyboard stand as claimed in claim 2, wherein a spring is mounted around the finger to facilitate the movement of the finger.7. The adjustable device in combination with a musical keyboard stand as claimed in claim 3, wherein a spring is mounted around the finger to facilitate the movement of the finger.8. The adjustable device in combination with a musical keyboard stand as claimed in claim 4, wherein a spring is mounted around the finger to facilitate the movement of the finger.