Bellyrail AssemblyGo back to previous page
The bellyrail assembly is the central structural unit of the grand piano by which the frame braces, rim, soundboard and keybed are all secured into one skeleton unit. The model shows a cross section of this assembly at the highest octave of the piano. It extends across the front of the entire piano just behind the keys and action.
Soundboard - The soundboard is made of clear, fine-grained, quarter sawn Alaskan Sitka Spruce, a wood renowned for its rich, vibrant tonal response especially in the bass of the instrument. A catalytic varnish seals the soundboard to humidity variations providing protection to the soundboard while adding stability for the instrument.
Liner cove - In the upper treble section of the piano, the soundboard liner is shaped in a cove configuration to maximize the flexibility of the soundboard between the vibrating bridge and the rigid liner. This feature enhances the full, vibrant treble tones.
Belly rail - The belly rail consists of a bottom (or vertical) rail and a top (or horizontal) rail constructed of hard rock maple. The bottom rail is the hub to which the frame braces, rim, keybed, and soundboard liners are attached. The entire assembly forms a solid unit through the use of a polyvinyl acetate glue.
Undercut treble bridge - In the upper treble section of the piano, the bridge is undercut to enhance free movement of the bridge. This feature combines with the liner cove to double reinforce the beauty of the treble sound.
Soundboard liner - The soundboard liner is solidly integrated into the belly rail assembly to provide a rigid termination point for the vibrating soundboard. This design is critical in reflecting energy back into the soundboard for full tone and long sustain.
Keybed - The keybed is triple reinforced for flatness by: (1) Rigid twenty-one ply construction, (2) Reinforcement from above by the bottom rail, and (3) Steel tubing mounted underneath the keyboard (not shown).Go back to previous page