Rotary valves for brass wind instruments
US4972751A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1990 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Jan 19, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10D9/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A rotary valve for brass wind instruments with improved lubricating and durability properties is provided. The valve body 2 or both the valve body 2 and casing 1 of the rotary valve comprise(s) a machinable ceramic-resin composite material. The rotary valve can be readily produced by a method which comprises impregnating a machinable ceramic article containing substantially continuous micropores with a liquid resin material and hardening the resin material; machine-processing the resulting machinable ceramic-resin composite article into a shape of the valve body or shapes of the valve body and casing; and assembling the valve body into a rotary valve having the valve body 2 of the composite material rotatably contained in the casing 1 of the composite material or a metal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.