Harmonium Basic Model Mechanism Schematic. Solid
Key Pattern.
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Three Styles of Key Construction
The Solid Key: The Key top and damper pads
are mounted on a single shaft, and there is a vertical center pin hinge and a
single guide pin. This style is cheap and simple with the main drawback being
that the bass and treble vents don't open evenly.
The Stick and Pallet: With this style, the pallet lift is parallel to the
sound board, and allows for a balanced air flow.
The Stick, Lever, and Pallet: This style is only found on expensive, 3
bank, coupler, scale/changer model harmoniums. There are more moving parts
involved, including the Coupler Sticks which run diagonally underneath the keys,
and the lever pins.
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