Button keyboard for lever operated musical instrument

摘要

The keyboard has spring-loaded (13) levers (7) which turn on bearings on the keyboard bracket (2) and which form guides for them. The bearings consist of detachable individual plates (11) inserted in slots (3,6) in the bracket, and with rivets (12) on which the levers turn. The plates have stop faces (18) bearing against the bracket, to which they are secured by clamping keys (20). The springs can each have a coil portion fitting in a bore (14) in the plate, and the bracket can have guides for the plates in the planes in which the levers work. Pins (19) can be provided on the plates, against which the keys bear.