GB734180A - Pin block and process of producing it - Google Patents
Pin block and process of producing itInfo
- Publication number
- GB734180A GB734180A GB3494153A GB3494153A GB734180A GB 734180 A GB734180 A GB 734180A GB 3494153 A GB3494153 A GB 3494153A GB 3494153 A GB3494153 A GB 3494153A GB 734180 A GB734180 A GB 734180A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resin
- formaldehyde
- plywood
- plies
- inch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/10—Tuning pins; Tensioning devices
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Laminated Bodies (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
734,180. Pianofortes. BALDWIN CO. Dec. 15, 1953, No. 34941/53. Class 88 (2). [Also in Group XXIII] A wrest plank for a piano is made of crossgrained resin-bonded plies of hard wood such as sugar maple, the thickness of the plies being in the range 1/8 to 1/28 inch. The ratio of hole diameter to pin diameter is between 0.925 and 0.96. The resin is preferably chosen and applied so that the plywood has a specific gravity between 0.72 and 0.87. The plywood may be either hot pressed or cold pressed. The resin used for hot pressing may be a thermosetting phenol-formaldehyde resin condensate carried to the point of an A stage resin, a urea formaldehyde resin or a resin of the acrylonitrile or melamine type. For cold pressing, condensation products of resorcinol and formaldehyde may be used with a catalyst, if necessary. In one example, two separate sets of 19 plies of 1/28 inch sugar maple are cooled with adhesive and pressed between platens heated to 300- 310‹ F. for 25 minutes. After cooling, the two structures are bonded together by inserting between them one 1/28 inch ply of the maple coated with a resorcinol-formaldehyde adhesive and a catalyst. The plywood is left to set and then cut to shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3494153A GB734180A (en) | 1953-12-15 | 1953-12-15 | Pin block and process of producing it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3494153A GB734180A (en) | 1953-12-15 | 1953-12-15 | Pin block and process of producing it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB734180A true GB734180A (en) | 1955-07-27 |
Family
ID=10371848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3494153A Expired GB734180A (en) | 1953-12-15 | 1953-12-15 | Pin block and process of producing it |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB734180A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7518046B1 (en) | 2008-01-17 | 2009-04-14 | Steinway Musical Instruments, Inc. | Wrestplanks |
-
1953
- 1953-12-15 GB GB3494153A patent/GB734180A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7518046B1 (en) | 2008-01-17 | 2009-04-14 | Steinway Musical Instruments, Inc. | Wrestplanks |
| WO2009091412A1 (en) * | 2008-01-17 | 2009-07-23 | Steinway Musical Instruments, Inc. | Wrestplanks |
| US7759565B2 (en) | 2008-01-17 | 2010-07-20 | Steinway Musical Instruments, Inc. | Wrestplanks |
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