Patent ID: 7267316

Claim:
An apparatus for selectively maintaining an open position of a lid of a keyboard musical instrument, said apparatus comprising: a brace that is operable to rotate about a center of rotation between an erect position that maintains the open position, and a collapsed position, in which the brace is housed in a body of the keyboard musical instrument when the lid of the keyboard musical instrument is closed, the brace including first position regulating bodies, provided on a base of the brace, that protrude from both sides of the base; and a bracket affixed to the body of the keyboard instrument and operatively engaged with the base of the brace, the bracket including a second position regulating body which includes a horizontal section extending in a horizontal direction, a curved section continuous therewith formed in a shape of an arc downward, and an inclined section continuous therewith extending linearly downward, wherein the brace, via the first regulating bodies and the second regulating body, interacts with the bracket to form a path of rotation of the brace, the angle of rotation of the brace being maintained at a constant angle by mutually engaging the first regulating bodies on the brace with the second regulating body in the bracket, such that, at the erect position, the base does not move in a position orthogonal to an axis of the brace and moves only in a direction to the end of the brace of the axis of the brace.