Rotary valve for musical instruments
US5798471A · kind A · utility
Inventor
Key dates
| Filing date | May 9, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | May 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10D9/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A rotary valve for musical instruments is provided. The valve is specially designed to have three internal passages with gentle curves and continuously circular passageways to provide true tonal qualities and a minimum of distortion. The valve passages have a bend radius of at least the diameter of the valve passage and the casing of the valve approximates three times the diameter of the passages. The valve passages to and from the loop are positioned on opposite sides of and cross over a through passage from the mouthpiece to the bell for economy of space and gentle passage curvature. The inlet and outlet openings or end holes in the loop engaging passages are located approximately 45.degree. from one another along their axes to avoid substantial changes in the direction of air flow. The 45.degree. angle is between diameters of the openings and can also be expressed as 135.degree. around the circumference of the rotor. Continuous flow during valve operation is provided in a modification. In this modification the bend radius is approximately one-half the passage diameter and the casing of the valve approximates two and one-half the passage diameter. Multiple valves for multiple loo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.