Abstract: A mounting bracket for supporting a key movement recording sensor assembly within a keyboard-operated musical instrument. The mounting bracket of the present invention incorporates a locking mechanism to prevent sensor assembly movement and it preferably conforms to a portion of the hammer flange assembly to reduce vertical space requirements. The locking mechanism, or alternatively the sensor board itself, provides a biasing force for engaging the sensor assembly. Applying a sufficient manual force to a release member on the locking mechanism overcomes the biasing force to unlock the sensor assembly to allow for the insertion, adjustment, or removal of the sensor assembly from the mounting bracket. A keyed retention mechanism augments the sensor assembly to simplify engagement and adjustment of the sensor assembly.

Abstract: For use with a key in a keyboard instrument, a solenoid mounting apparatus for releasably securing solenoid assemblies has a mounting rail with essentially flat first and second faces, first and second end edges, and first and second mounting edges. Solenoid assembly securing channels are formed into each mounting edge. Included in the solenoid assemblies are brackets for retaining each of the solenoids to the rail and a threaded member for releasably anchoring each bracket to either of the channels.