Piano key frame
US4127051A · kind A · utility
9Cited by
4References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Sep 19, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10C3/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.