Stringed Instrument Bridge With Independent Height And Intonation Locking
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Solution Overview
Problem
Existing bridge assemblies for stringed instruments often require a certain minimum level of string tension to maintain adjustment and energy transfer, which is not always feasible, leading to inadequate support and unreliable positioning of strings.
Innovation Solution
A bridge design with fixings on two axes of adjustment that can be affixed independently of string tension, allowing for precise adjustment and locking of saddle elements on an inclined surface, using height and intonation lockings fixings to secure the saddle in position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bridge assemblies rely on string tension to maintain adjustment, then the bridge structure can be simpler, but the adjustment reliability deteriorates when string tension is insufficient
Solution Approach 1:
The bridge assembly is segmented into independent functional components: the bridge chassis, saddle element, and separate locking mechanisms (height adjustment fixing and intonation locking fixing). Each component has a specific function, and the locking mechanisms operate independently of string tension to secure adjustments. This segmentation allows the locking function to be reliable without requiring complex tension-dependent structures.
Solution Approach 2:
The locking mechanisms are designed to preliminarily secure the saddle element in position before string tension is applied. The height adjustment fixing and intonation locking fixing can be manipulated to urge the saddle element against the inclined surface of the interfacing wedge, locking the position in advance. This preliminary action ensures that even if string tension is insufficient, the adjustment remains reliable because it was locked in place beforehand.
2Adaptability or versatility
If the bridge requires minimum string tension to hold position, then the locking mechanism can be simpler, but the adaptability to low-tension instruments deteriorates
Solution Approach 1:
The interfacing wedge with its inclined surface acts as an intermediary between the saddle element and the bridge chassis. The height adjustment fixing and intonation locking fixing manipulate the saddle element against this inclined surface, creating a mechanical advantage that allows positioning and locking without relying on high string tension. This intermediary mechanism enables the bridge to adapt to low-tension instruments while maintaining secure locking through the geometric relationship of the inclined surface.
Solution Approach 2:
The locking mechanism utilizes changes in positional parameters rather than force parameters. By manipulating the height adjustment fixing and intonation locking fixing to move the saddle element along the inclined surface of the interfacing wedge, the system changes the position parameter to achieve locking. This approach does not depend on maintaining minimum string tension, thereby increasing adaptability to low-tension instruments while using a relatively simple mechanical structure.
3Manufacturing precision
If the saddle element is adjustable on an inclined surface, then height adjustment precision is improved, but the complexity of the interfacing mechanism increases
Solution Approach 1:
The interfacing mechanism uses an inclined surface (a planar geometric feature) rather than a curved surface, which simplifies manufacturing while still providing precise height adjustment. The saddle element moves along the inclined surface of the interfacing wedge, and the geometry of this inclined surface directly determines the height adjustment precision. This geometric approach achieves manufacturing precision without requiring complex curved or spheroidal interfaces.
Solution Approach 2:
The inclined surface of the interfacing wedge provides a direct geometric relationship between the position of the saddle element and its height. By changing the position parameter of the saddle element along the inclined surface through the locking mechanisms, precise height adjustment is achieved. The fixed angle of the inclined surface ensures consistent and precise adjustment without requiring complex mechanisms, as the geometry itself provides the precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures that adjustments are maintained regardless of string tension, providing reliable support and precise string positioning, enhancing the instrument's performance and tone.
Implementation Method 1
an interfacing wedge arranged to abut the saddle element such that movement of the saddle element over an inclined surface of the interfacing wedge results in a change in the height of the saddle element with respect to the bridge chassis
Data Source
AI summary
A bridge (101) for a stringed instrument (100) has a bridge chassis (200) and at least one saddle (202). The saddle (202) allows adjustment of string height and intonation. In order to achieve this, a height adjustment fixing (414) and an intonation locking fixing (404) are manipulable to urge the saddle element (410′) against an interfacing wedge (412) in respective different directions to lock the saddle element (410′) in a desired position against the interfacing wedge (412).