US4155284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piano and soundboard therefor
Assignee: KRAKAUER BROS Inc
•
Filing: 1977-08-18
•
Granted: 1979-05-22
•
Expires: 1997-08-18
Abstract
Abstract A piano construction providing significantly improved tonal quality and balance by utilizing a soundboard which is tightly coupled to the string frame along the top edge and the two side edges of the soundboard except for a loose coupling adjacent the end of the bridge in the treble section along one of the side edges and which soundboard is loosely coupled along the lower edge as the latter is normally positioned in an upright piano. Additionally, a massive support rib on the string frame adjacently extends along the top edge of the soundboard to improve tone, and the strings at their upper ends are held in V-notches at tangential points about the string circumference to avoid lateral vibration. The string frame and soundboard are designed to produce a partially free diaphragmatic-type operation free of soundboard dead spots which maximizes tonal qualities for the dimensional restrictions of small pianos.
Inventors
- 👤 Howard K. Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:36
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A string instrument comprising a string frame, a plurality of strings tensioned on said string frame, a soundboard having a first edge portion extending transversely of said strings adjacent one of the ends of said strings and coupled to said frame, a second edge portion extending transversely to said strings at the other ends thereof and suspended vibrationally free of said string frame to vibrate independently of contact with said frame, a third edge portion extending between said first and second edge portions and coupled to said frame along substantially its entire length, and a fourth edge portion extending between said first and second edge portions and having a first part adjacent to said second edge portion and coupled to said frame and a second part thereof adjacent to said first edge portion, and bridge means extending transversely of said strings adjacent said other ends of said strings and coupling said strings to said soundboard, said bridge means having a bass end terminating adjacent said second edge portion and a treble end terminating adjacent said second part of said fourth edge portion so the efficiency and tonal qualities of said soundboard are maximized for a given area.
Claim 2
Dependent Claim
197 words
A string instrument comprising a string frame, a plurality of strings tensioned on said string frame, a soundboard having a first edge portion extending transversely of said strings adjacent one of the ends of said strings and coupled to said frame, a second edge portion extending transversely to said strings at the other ends thereof and suspended vibrationally free of said string frame to vibrate independently of contact with said frame, a third edge portion extending between said first and second edge portions and coupled to said frame along substantially its entire length, and a fourth edge portion extending between said first and second edge portions and having a first part adjacent to said second edge portion and coupled to said frame and a second part thereof adjacent to said first edge portion, and bridge means extending transversely of said strings adjacent said other ends of said strings and coupling said strings to said soundboard, said bridge means having a bass end terminating adjacent said second edge portion and a treble end terminating adjacent said second part of said fourth edge portion so the efficiency and tonal qualities of said soundboard are maximized for a given area.
Claim 3
Dependent Claim
196 words
A string instrument comprising a string frame, a plurality of strings tensioned on said string frame, a soundboard having a first edge portion extending transversely of said strings adjacent one of the ends of said strings and coupled to said frame, a second edge portion extending transversely to said strings at the other ends thereof and suspended vibrationally free of said frame, a third edge portion extending between said first and second edge portions and coupled to said frame along substantially its entire length, and a fourth edge portion extending between said first and second edge portions and having a first part adjacent to said second edge portion and coupled to said frame and a second part thereof adjacent to said first edge portion and suspended vibrationally free of said frame, and bridge means extending transversely of said strings adjacent said other ends of said strings and coupling said strings to said soundboard, said bridge means having one end thereof terminating adjacent said second edge portion and the other end thereof terminating adjacent said second part of said fourth edge portion so the efficiency and tonal qualities of said soundboard are maximized for a given area.
Claim 4
Dependent Claim
196 words
A string instrument comprising a string frame, a plurality of strings tensioned on said string frame, a soundboard having a first edge portion extending transversely of said strings adjacent one of the ends of said strings and coupled to said frame, a second edge portion extending transversely to said strings at the other ends thereof and suspended vibrationally free of said frame, a third edge portion extending between said first and second edge portions and coupled to said frame along substantially its entire length, and a fourth edge portion extending between said first and second edge portions and having a first part adjacent to said second edge portion and coupled to said frame and a second part thereof adjacent to said first edge portion and suspended vibrationally free of said frame, and bridge means extending transversely of said strings adjacent said other ends of said strings and coupling said strings to said soundboard, said bridge means having one end thereof terminating adjacent said second edge portion and the other end thereof terminating adjacent said second part of said fourth edge portion so the efficiency and tonal qualities of said soundboard are maximized for a given area.
Claim 5
Dependent Claim
42 words
A string instrument as claimed in claim 2 wherein said string frame includes a massive support rib extending along an edge adjacent to said first edge portion of said soundboard and generally below string speaking length termini along a complete string scale.
Claim 6
Dependent Claim
74 words
A string instrument as claimed in claim 3 including a terminus device defining one end of a speaking length of at least one string and said bridge means on said soundboard defining the other end of the string speaking length, said terminus device comprising string seat means engaging said string at circumferentially spaced points located at opposite sides of a plane containing the longitudinal axis of the string and disposed perpendicular to the soundboard.
Claim 7
Dependent Claim
25 words
A string instrument as claimed in claim 4 wherein each of said seat means comprises notch means presenting diverging opposite side edges engaging the string.
Claim 8
Dependent Claim
59 words
A string instrument as claimed in claim 5 including a hammer strike line being a constant distance above said second edge of said soundboard for a portion thereof adjacent said fourth edge of said soundboard and being inclined upwardly for a remaining portion thereof to engage bass strings at an increasing distance above said second edge of said soundboard.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |