Tremolo Lever and Cam Layout for Stable Pitch Control
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Solution Overview
Problem
Conventional stringed instrument tremolo systems suffer from inefficiencies in coupling to the bridge, leading to issues such as loss of sustain, dynamics, and tone, unpredictable string action changes, structural instability, frequent string breaks, complex restringing processes, and limited pitch ranges, among others.
Innovation Solution
A relative harmonic dynamic pitch control system that provides secure attachment to the instrument body, uses off-the-shelf strings, and maintains string action and intonation stability during pitch changes, with a user-friendly interface and predictable pitch adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional floating tremolo designs are used, then pitch manipulation is achieved, but string sustain, dynamics, and tone are lost due to inefficient coupling between the string and bridge
Solution Approach 1:
The bridge is divided into separate functional components: a stable anchoring system for string attachment and a independent vibrato mechanism. This segmentation allows the string coupling points to remain fixed on the instrument body while the vibrato arm manipulates pitch through a separate lever arm, eliminating the coupling inefficiencies of floating designs.
Solution Approach 2:
An intermediary lever arm system is introduced between the player's input and the string. The vibrato arm acts as a lever that pivots at a fixed point on the bridge, providing mechanical advantage and precise control over string pitch without requiring the entire bridge to float or move, thus maintaining efficient string-to-bridge coupling.
2Adaptability or versatility
If mechanical pitch manipulation devices are used, then artistic pitch effects are achieved, but string action changes unpredictably affecting string spacing, height, and intonation
Solution Approach 1:
The system separates pitch manipulation from string action control. The vibrato arm affects only the instantaneous pitch of the string through lever arm rotation, while the string's physical position, height, and spacing remain determined by the fixed bridge anchoring points, eliminating unpredictable action changes.
Solution Approach 2:
Instead of moving the bridge to change pitch (which causes action changes), the invention inverts the approach by keeping the bridge fixed and using a lever arm to apply localized force to the string, changing pitch without altering the string's overall position or action.
3Adaptability or versatility
If pitch changes are implemented, then artistic expression is enhanced, but structural integrity is compromised due to unpredictable stresses on the neck and neck joint
Solution Approach 1:
The fixed bridge design acts as a counterweight and stable anchor point that resists the forces generated during pitch manipulation. The lever arm system distributes forces through the bridge's rigid structure rather than creating unpredictable moments on the neck joint, protecting the instrument's structural integrity.
Solution Approach 2:
The lever arm serves as an intermediary that isolates the neck and joint from the forces of pitch manipulation. All stresses are contained within the bridge and lever arm assembly, preventing transmission of unpredictable forces to the neck structure.
4Ease of operation
If conventional tremolo systems are used, then pitch manipulation is possible, but string breakage occurs frequently and restringing requires specialized tools and procedures
Solution Approach 1:
The bridge design incorporates universal string attachment points that work with standard ball-end strings, eliminating the need for specialized string types or modification tools. The system is designed to accommodate conventional strings without requiring custom attachment mechanisms or specialized restringing procedures.
Solution Approach 2:
The bridge includes built-in string retention features and secure anchoring mechanisms that prevent string breakage and accidental dislodgement during normal use, eliminating the need for backup strings or specialized repair tools during performance.
Data Source
AI summary
In some aspects, a tremolo for a stringed-instrument includes a tremolo frame and tremolo cams including a laterally spaced-apart curved string contact surfaces at positions and spacings corresponding to string positions of strings for a stringed instrument. The tremolo lever is rotatably mounted to the tremolo frame to rotate about an axis of rotation, an upper portion of the tremolo lever adjacent the tremolo frame and a lower portion extending downwardly from the upper portion, the lower portion including, at or near a distal portion thereof, one or more string retention structures configured to secure string end portions. The upper portion of the tremolo lever includes a first mechanical connector to receive a mating second mechanical connector at a first end portion of an outer lever arm so that forces applied to the outer lever arm by a user to rotate the tremolo lever about the axis of rotation in a first direction of rotation displace the distal portion of the tremolo lever in a first direction to increase a tension in, and a pitch of, strings secured at the distal portion of the tremolo lever and forces applied to the outer lever arm to rotate the tremolo lever about the axis of rotation in a second direction of rotation displace the distal portion of the tremolo lever in a second direction to decrease a tension in, and a pitch of, strings secured at the distal portion of the tremolo lever.