Planar Valve Wind Instrument Reducing Manufacturing Precision
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Solution Overview
Problem
Brass wind instruments face issues with sticky or lagging valves due to alignment and precision fit problems, leading to incomplete or delayed occlusion of air passages, and poor intonation caused by inaccuracies in tube lengths and manufacturing, making them difficult to play, especially for young players.
Innovation Solution
A valved wind instrument design featuring a tubular body with planar surfaces and intermediate layers for smooth movement, allowing for rotational or slidable valve operation, reducing the need for precise machining and using a lighter return spring, with a key assembly and sealing gasket layers for easy operation and consistent pitch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional linear or rotary valves with curved metal surfaces are used, then pitch variation is achieved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The patent inverts the traditional curved valve design by using a planar valve body with planar sealing surfaces. This eliminates the need for precision machining of curved surfaces and their alignment with curved housing surfaces, significantly reducing manufacturing precision requirements while maintaining effective air passage control.
Solution Approach 2:
The invention changes the geometric parameters of the valve from curved surfaces to planar surfaces. This parameter change simplifies manufacturing by allowing standard machining practices and reduces the stringency of alignment tolerances between valve and housing components.
2Reliability
If heavy return springs are used to overcome friction and ensure valve closure, then reliable valve operation is achieved, but ease of operation for young players deteriorates
Solution Approach 1:
The patent employs a flexible sealing gasket instead of rigid metal-to-metal sealing. This flexible membrane maintains reliable sealing through its inherent elasticity while requiring minimal force to deform and seal, significantly reducing the actuation effort needed compared to traditional heavy springs.
Solution Approach 2:
The invention changes the sealing mechanism from rigid mechanical contact to flexible membrane deformation. This parameter change allows the use of lighter return springs while maintaining reliable valve closure, as the flexible gasket requires less force to achieve and maintain sealing contact.
3Reliability
If precision machining is performed on curved valve surfaces to prevent air leakage, then sealing performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces precision-machined curved sealing surfaces with a flexible sealing gasket that conforms to the planar valve and housing surfaces. This flexible membrane achieves reliable air sealing through its ability to deform and fill microscopic gaps, eliminating the need for complex precision machining operations.
Solution Approach 2:
The invention inverts the curvature approach by using flat planar surfaces instead of curved surfaces. This simplification, combined with the flexible gasket, achieves effective sealing without the manufacturing complexity associated with precision machining of curved surfaces and their alignment.
4Measurement precision
If accurate tube lengths are maintained for good intonation, then pitch accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the tuning section into separate, adjustable tube segments rather than a single fixed-length tube. This segmentation allows for easy adjustment of individual segment lengths to achieve accurate overall tube length and good intonation, reducing the stringency of manufacturing precision requirements for each individual component.
Data Source
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AI summary
A valved wind instrument including a tubular body having a tuning section, a lead pipe connected to a first end of the tuning section and a bell pipe connected to a second end of the tuning section, said tubular body being configured to allow a vibrating column of air to pass therethrough; wherein the tuning section includes an air inlet port for receiving air flow from the lead pipe at the first end, an air outlet port for delivering said air flow to the bell tube at the second end, a plurality of user operable valves; wherein each valve of said plurality of valves is in fluid communication with an adjacent valve by a first tubular portion so as to provide fluid communication between the inlet port and the outlet port, and wherein each valve of said plurality of valves is user moveable between a first position and a second position and each so as to increase the air pathway length between the inlet port and the outlet port by way of a second tubular portion; and wherein each second tubular portions is coplanar with each other, and wherein the second tubular portions are integrally formed from a polymeric material within the tuning section, wherein the tuning section is provided by molded first and second body member that are bonded together and sealingly engaged along a plane parallel to the longitudinal axes of the second tubular portions.