GB2285848A - Slide valve spring damping - Google Patents
Slide valve spring damping Download PDFInfo
- Publication number
- GB2285848A GB2285848A GB9424658A GB9424658A GB2285848A GB 2285848 A GB2285848 A GB 2285848A GB 9424658 A GB9424658 A GB 9424658A GB 9424658 A GB9424658 A GB 9424658A GB 2285848 A GB2285848 A GB 2285848A
- Authority
- GB
- United Kingdom
- Prior art keywords
- annular portion
- damping pad
- spring
- slide valve
- piston
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
- G10D9/00—Details of, or accessories for, wind musical instruments
- G10D9/04—Valves; Valve controls
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Fluid-Damping Devices (AREA)
Abstract
A slide valve (5) for a brass musical instrument includes a damping means (1) arranged to damp vibrations of the valves spring (9), and to acoustically isolate the spring (9) from the piston (7, 8) and the valve chamber (6, 10). This reduces the noise produced by the slide valve (5). The generally circular damping pad (1) has an annular portion (4) thinner than the rest of the pad (1). <IMAGE>
Description
SLIDE VALVE SPRING DAMPING
Brass musical instruments such as trumpets include slide valves. A slide valve has a valve chamber, and a central piston which is moveable between a first and a second position. As the piston is moved, the path followed by air passsing through the instrument is changed, thereby giving different notes. The valve has a spring extending between one end of the piston and one end of the chamber which biases the piston towards the first position.
The inclusion of a spring in the slide valve leads to undesirable noise, which is loud enough to be picked up by the sensitive sound equipment which is available today.
This noise is due to vibration of the spring caused when the piston is released resulting in the spring bouncing on the end of the piston and the valve chamber. The bottom of the piston is made from a thin brass sheet, and this acts as a diaphragm, amplifying any noise in the valve.
Some attempts have been made by individual musicians to reduce this noise, but so far these have not reduced the spring vibration noise sufficiently so that it is not picked up.
According to a first aspect of the present invention, a slide valve for a brass musical instrument includes means to damp the vibrations of its spring and acoustically isolate the spring from the piston and valve chamber.
The inclusion of means to damp the vibration of the spring reduces the length of time during which it vibrates and therefore substantially attenuates the noise generated by the spring. By acoustically isolating the spring, no vibration travels to the body of the instrument, and therefore there is no amplification of the noise.
Preferable the means to damp the vibration of the spring is a damping pad which is provided between an end of the spring and either of the valve chamber and the piston.
Preferably, two damping pads are provided, one between the spring and the valve chamber, the other between the spring and the piston.
The damping pad preferably has a generally circular shape when viewed in the axial direction of the chamber, and has an annular portion which is thinner than that of the rest of the pad.
The damping pad preferably comprises a first, second and third annular portion arranged concentrically, the second annular portion having an outer diameter equal to the inner diameter of the first annular portion, and having an first surface continuous with the first surface of the first annular portion, and a thickness less than that of the first annular portion, and the third annular portion having an outer diameter equal to the inner diameter of the second annular portion, and having a second surface continuous with the second surface of the second annular portion, and having a thickness greater than the second annular portion.
In this case, the outer diameter of the third annular portion of the damping pad is preferably smaller than the diameter of the spring, and the inner diameter of the first annular portion is greater than the diameter of the spring which the pad is to support.
Preferably, one damping pad is positioned in the bottom of the valve chamber of the slide valve with its first surface contacting the bottom of the body, and its second surface being in contact with the spring. In this case, the bottom of the valve chamber is preferably provided with a central recess so that the first surface of the first annular portion of the damping pad rests on an annular portion of the bottom of the body, and the first surface of the second and third annular portions are not in contact with the bottom of the body, thereby allowing the second and third annular portions to flex to damp the vibrations of the spring.
Preferably, another damping pad is positioned in the bottom of the piston with its second surface contacting the piston, and its first surface being in contact with the spring. The bottom of the piston is preferably provided with a raised central portion which supports the second surface of the third annular portion. In this case, the second surfaces of the second and third annular portions are not in contact with the piston, allowing them to flex to damp the vibrations of the spring. With the damping pad arranged in this way, the second annular portion will never come into contact with any part of the valve chamber, and will only contact the spring, thereby ensuring that there is always damping for the spring.
According to a second aspect of the present invention, a damping pad for use in a slide valve for a brass musical instrument has a generally circular shape when view in the axial direction, and has an annular portion which is thinner than that of the rest of the pad.
Such a damping pad is robust, yet has a very thin portion on which the spring rests. This thin portion flexes much more easily than the thicker portions which support the thin portion, and therefore the damping pad damps the vibration of a spring much more efficiently, giving further acoustic vibration. The pad preferably has a central hole.
According to a third aspect of the present invention, a damping pad for a slide valve for a brass musical instrument comprises a first, second and third annular portion arranged concentrically, the second annular portion having an outer diameter equal to the inner diameter of the first annular portion, and having an first surface continuous with the first surface of the first annular portion, and a thickness less than that of the first annular portion, and the third annular portion having an outer diameter equal to the inner diameter of the second annular portion, and having a second surface continuous with the second surface of the second annular portion, and having a thickness greater than the second annular portion.
In all aspects of the present invention, the damping pad is preferably made from a resilient elastomeric material, for example 600 Shore hardness FQ nitrile rubber.
A preferred embodiment of the present invention will now be described in accordance with the accompanying drawing, in which:
Figure 1 shows a cross section of a damping pad; and
Figure 2 shows a cross section of a slide valve.
Figure 1 shows a damping pad 1 made from a resilient elastomeric plastics material. In cross-section, the pad has a thick outer portion 2 and a thick inner portion 3, between which is a thin annular portion 4. The diameters of the various portions is such that when the pad supports a spring, the spring rests purely on the thin portion. The difference in thickness of the other portions ensures that the spring remains centred, i.e. either the inner diameter of the spring surrounds the central raised portion, or when the pad is reversed, the outer diameter of the washer is within the inner diameter of the outer portion.
Figure 2 shows a slide valve 5 of a brass musical instrument, a piston 7 is provided inside a chamber 6. A spring 9 extends between one end 10 of the chamber 6 and one end 8 of the piston 7 in such a way that the spring 9 tends to bias the piston 7 away from the end 10 of the chamber 6. To prevent the noise caused by vibration of the spring 9, a damping pad 1 is included between each end of the spring 9 and the piston 7 or chamber 6. The damping pad 1 is arranged in such a way that at least one of the thick portions is supported by the piston 7 or the bottom 10 of the chamber 6. The other thick portion may also be supported by the piston 7 or the chamber 6, but the thin portion is arranged so that it will not come into contact with either the piston 7 or the chamber 6. In this way, the thin portion which supports the spring 9 is able to flex freely without its movement being impeded by the slide valve.
The inclusion of a damping pad greatly reduces the noise generated by the spring as the piston is released.
This is achieved due to the damping effect of the damping pad, and by acoustically isolating the spring from the valve.
Claims (14)
1. A slide valve for a brass musical instrument including means to damp the vibrations of its spring and acoustically isolate the spring from the piston and valve chamber.
2. A slide valve according to claim 1, in which the means to damp the vibration is a damping pad provided between an end of the spring and either of the valve chamber and the piston.
3. A slide valve according to claim 2, in which two damping pads are provided, one between the spring and the valve chamber, the other between the spring and the piston.
4. A slide valve according to claim 2 or 3, in which the damping pad has a generally circular shape when viewed in the axial direction of the chamber, and has an annular portion which is thinner than that of the rest of the pad.
5. A slide valve according to claim 4, in which the damping pad has a first, second and third annular portion arranged concentrically, the second annular portion having an outer diameter equal to the inner diameter of the first annular portion, and having a first surface continuous with a first surface of the first annular portion, and a thickness less than that of the first annular portion, and the third annular portion having an outer diameter equal to the inner diameter of the second annular portion, and having a second surface continuous with a second surface of the second annular portion, and having a thickness greater than that of the second annular portion.
6. A slide valve according to claim 5, in which the outer diameter of the third annular portion of the damping pad is smaller than the diameter of the spring, and the inner diameter of the first annular portion is greater than the diameter of the spring.
7. A slide valve according to claims 4 or 5, in which the damping pad is positioned in the bottom of the valve chamber of the slide valve with its first surface contacting the bottom of the valve chamber, and its second surface being in contact with the spring.
8. A slide valve according to claim 7, in which the bottom of the valve chamber includes a central recess on which the first annular portion of the damping pad rests on the annular portion of the bottom of the valve chamber, and the first surface of the second and third annular portions are not in contact with the bottom of the valve chamber, thereby allowing the second and third annular portions to flex to damp the vibrations of the spring.
9. A slide valve according to any one of claims 5 to 8, in which a damping pad is positioned in the bottom of the piston with its second surface in contact with the piston, and its first surface in contact with the spring, the bottom of the piston including a raised central portion which supports the second surface of the third annular portion.
10. A slide valve according to any of claims 2 to 9 in which the damping pad is made from a resilient elastomeric material.
11. A slide valve according to claim 10, in which the material of the damping pad is 600 Shore hardness FQ nitrile rubber.
12. A damping pad for use in a slide valve for a brass musical instrument having a generally circular shape when viewed in the axial direction, and having an annular portion which is thinner than that of the rest of the pad.
13. A damping pad according to claim 11, including a central aperture.
14. A damping pad according to claim 13, in which the material is 60 Shore hardness FQ nitrile rubber.
14. A damping pad according to claim 13, having a first, second and third annular portion arranged concentrically, the second annular portion having an outer diameter equal to the inner diameter of the first annular portion, and having a first surface continuous with a first surface of the first annular portion, and a thickness less than that of the first annular portion, and the third annular portion having an outer diameter equal to the inner diameter of the second annular portion, and having a second surface continuous with a second surface of the second annular portion, and having a thickness greater than the second annular portion.
15. A damping pad according to any of claims 12 to 14 made from a resilient elastomeric material.
16. A damping pad according to claim 15, in which the material is 600 Shore hardness FQ nitrile rubber.
Amendments to the claims have been filed as follows
diameter of the first annular portion is greater than the
diameter of the spring.
7. A slide valve according to claims 4 or 5, in which the
damping pad is positioned in the bottom of the valve
chamber of the slide valve with its first surface
contacting the bottom of the valve chamber, and its second
surface being in contact with the spring.
8. A slide valve according to claim 7, in which the
bottom of the valve chamber includes a central recess on
which the first annular portion of the damping pad rests on
the annular portion of the bottom of the valve chamber, and
the first surface of the second and third annular portions
are not in contact with the bottom of the valve chamber,
thereby allowing the second and third annular portions to
flex to damp the vibrations of the spring.
9. A slide valve according to any one of claims 5 to 8,
in which a damping pad is positioned in the bottom of the
piston with its second surface in contact with the piston,
and its first surface in contact with the spring, the
bottom of the piston including a raised central portion
which supports the second surface of the third annular
portion.
10. A slide valve according to any of claims 2 to 9 in
which the damping pad is made from a resilient elastomeric
material.
11. A slide valve according to claim 10, in which the
material of the damping pad is 60 Shore hardness FQ
nitrile rubber.
12. A damping pad for use in a slide valve for a brass
musical instrument, the damping pad having a generally
circular shape when viewed in the axial direction, and a central aperture, the pad having a first, second and third annular portion arranged concentrically, the second annular portion having an outer diameter equal to the inner diameter of the first annular portion, and having a first surface continuous with a first surface of the first annular portion, and a thickness less than that of the first annular portion, and the third annular portion having an outer diameter equal to the inner diameter of the second annular portion, and having a second surface continuous with a second surface of the second annular portion, and having a thickness greater than the second annular portion.
13. A damping pad according to claim 12, made from a resilient elastomeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9424658A GB2285848A (en) | 1993-12-10 | 1994-12-07 | Slide valve spring damping |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB939325262A GB9325262D0 (en) | 1993-12-10 | 1993-12-10 | Slide valve spring damping |
| GB9424658A GB2285848A (en) | 1993-12-10 | 1994-12-07 | Slide valve spring damping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9424658D0 GB9424658D0 (en) | 1995-02-01 |
| GB2285848A true GB2285848A (en) | 1995-07-26 |
Family
ID=26303997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9424658A Withdrawn GB2285848A (en) | 1993-12-10 | 1994-12-07 | Slide valve spring damping |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2285848A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB473818A (en) * | 1937-02-16 | 1937-10-20 | Charles Norman Macleod Wornell | Improvements in valves for brass wind instruments |
| GB778884A (en) * | 1954-05-31 | 1957-07-10 | Anciens Ets Brisson | Improvements in and relating to valves |
| GB2178137A (en) * | 1985-06-26 | 1987-02-04 | Nippon Musical Instruments Mfg | A valve shifting mechanism for a valved musical instrument |
-
1994
- 1994-12-07 GB GB9424658A patent/GB2285848A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB473818A (en) * | 1937-02-16 | 1937-10-20 | Charles Norman Macleod Wornell | Improvements in valves for brass wind instruments |
| GB778884A (en) * | 1954-05-31 | 1957-07-10 | Anciens Ets Brisson | Improvements in and relating to valves |
| GB2178137A (en) * | 1985-06-26 | 1987-02-04 | Nippon Musical Instruments Mfg | A valve shifting mechanism for a valved musical instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9424658D0 (en) | 1995-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |