Piano key frame
AssigneeD. H. Baldwin Company
InventorHarold A. Conklin, Jr.
Life of this patent
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Abstract
A piano key frame assembly comprising a rigid metal frame, preferably formed from aluminum tubing, for supporting the piano keys and action, the frame having a front rail, an intermediate balance rail and a back rail, the back rail mounting adjustment means for leveling the keys, the key frame having adjustable feet by means of which it is positioned and leveled within the piano case, the conventional key bed being replaced by relatively narrow key bed brackets extending along the opposite sides of the case on which the adjustable feet are supported, means being provided to align and maintain the key frame on the key bed brackets.
Claims17
A key frame for a piano consisting essentially of a rigid, generally rectangular metal frame having a front rail, a balance rail and a back rail connected at their opposite ends to end rails, a plurality of spaced apart crossrails extending between and interconnecting said balance rail and said front and back rails at spaced apart intervals between said end rails, and mounting means on the undersurface of said key frame adjacent its corners for slidably mounting said key frame on a supporting surface.
Dependencies are inferred from the claim text.