Music stand

Claim 1

A music stand comprising: a music desk having a back and a lip positioned at the bottom of said back; a vertical support pivotally mounted at the top end to the back of said music desk, said support comprising a top half adapted to be telescoped into a bottom half for varying the height of said music desk relative to the bottom end of said support; height adjustment means mounted to cooperate with said two halves for maintaining the telescoped position of said two halves relative one to the other as desired; a base for the music stand including a plate member having structure defining a first hole in said plate member, said first hole being sized to receive the bottom end of said vertical support in easy slip fit when said plate member and said vertical support are assembled, and said first hole having a first center that establishes a center axis perpendicular to said plate member; and means for locking said vertical support to said base and for vertically locating and orienting said support relative to said base comprising: a socket cup having a cylindrical wall and mounted to said plate member on the underside thereof, said socket cup having a diameter substantially equal to and being concentric with the hole in said plate member, and said socket cup being adapted to receive the bottom end of said vertical support to locate same vertically and to support same in a substantially vertical orientation relative to the said music stand''s base, a lockring member rotatably mounted to said base''s plate member, said lockring having structure defining a second hole that establishes a second center that can lie on the center axis, and said second hole also being sized to receive the bottom end of said vertical support in easy slip fit relation, one of said plate and lockring members having structure defining at least two arcuate slots therein lying on the circumference of a first circle, the other of said plate and locking members having at least two pins fixed thereto and lying on second circle having a diameter equal to the diameter of said first circle, and the centers of the first and second holes being offset from the centers of the first and second circles by approximately the same distance, said plate and lockring members being interconnected by said pins with said pins being positioned in said slots such that the centers of the first and second circles coincide, and said lockring member being rotatable on said plate member between a release position where the centers of the first and second holes coincide such that said vertical support can be easily withdrawn from assembly with said base, and a lock position where the centers of the first and second holes are offset from each other such that said vertical support can be easily locked against the walls of said socket cup to vertically locate and orient said support in assembly with said base.