The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 1998
Filed:
May. 09, 1997
Robert M Miller, St. Louis, MO (US);
Other;
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 loops are provided by rotating each subsequent valve 180.degree.. Valves with the internal and external short loops are also described.