A fixture for supporting a musical instrument drum, or the like, includes a stem which supports a ball and the ball is clampable between two clamping parts forming a socket for clamping the ball. A pivotable cam draws the two socket parts together or releases them from clamping and unclamping the ball,...http://www.google.fr/patents/US4796508?utm_source=gb-gplus-shareBrevet US4796508 - Musical instrument support fixture
