Fast-acting clamp for a musical instrument

A fast-acting clamp for a musical instrument comprising

• a bracket being U-shaped, and having
• a proximal side having an outside surface and an inside surface;
• a distal side;
• and
• a through hole formed through the proximal side;
• a connector having a through hole, said connector attached to the bracket;
• a threaded rod extending through the through hole in the bracket and having
• a distal end;
• a proximal end extending through the through holes in the bracket and the connector;
• an outer surface;
• a knob formed on the distal end;
• and
• a thread formed around the outer surface;
• and
• a positioning assembly mounted on the inside surface of the proximal side of the bracket and having
• a base attached to the inside surface of the proximal side of the bracket;
• a primary retainer attached pivotally to the inside surface of the proximal side of the bracket and having
• a top;
• a bottom;
• a proximal end;
• a distal end;
• a tab formed on the distal end;
• a semicircular notch formed in the proximal end and selectively engaging the thread on the threaded rod;
• and
• two edges formed on the proximal end on opposite sides of the semicircular notch;
• a secondary retainer mounted pivotally on the base and having
• a top;
• a bottom;
• a proximal end;
• a distal end;
• a semicircular notch formed in the proximal end, corresponding to the semicircular notch in the primary retainer and selectively engaging the thread on the threaded rod;
• and
• two edges formed on the proximal end on opposite sides of the semicircular notch and overlapping the edges of the primary retainer;
• and
• two springs connecting to the retainers and the base to pivot the retainers inward.