Instrument Cord Adjuster With Twist-Proof Stable Length Locking
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Solution Overview
Problem
Existing devices for adjusting the length of cords used to carry musical instruments, such as saxophones, often require significant effort and can lead to unwanted movement or twisting, making it difficult to maintain a stable position during prolonged use.
Innovation Solution
A device comprising two interlocking parts with a spring mechanism, where the cup-shaped part has recesses and openings that guide the cord, and the use part has a groove and leadership grooves with deflection elements, allowing for easy length adjustment without disturbing the cord's orientation, ensuring stability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cord is held very tightly by the adjusting element to prevent accidental slipping, then the reliability of the device is improved, but the ease of operation deteriorates as readjustment during playing or during a short break becomes more difficult
Solution Approach 1:
The adjusting element incorporates a spring mechanism that dynamically adjusts the clamping force. When the user releases the adjustment button, the spring automatically applies sufficient force to hold the cord securely in place, preventing accidental slipping. During readjustment, the spring force is temporarily overcome by the button pressure, allowing smooth repositioning. This dynamic balance between spring force and button pressure resolves the contradiction between secure holding and easy readjustment.
2Reliability
If the cord sections are clamped in a small opening to lock the slider in place, then the stability of the device is improved, but the friction and wear on the cord increase
Solution Approach 1:
The adjusting element acts as an intermediary between the cord sections and the cup-shaped element. Instead of directly clamping the cord in a small opening, the spring-loaded adjusting element distributes the clamping force over a larger surface area of the cord. This intermediary mechanism achieves secure locking stability while minimizing concentrated friction and wear on the cord material.
3Ease of operation
If the openings in the cup-shaped element and the adjusting element overlap significantly to allow free movement, then the ease of operation is improved, but the stability of the cord position deteriorates
Solution Approach 1:
The spring force parameter in the adjusting element is carefully calibrated to provide the optimal balance between ease of movement and position stability. When the adjustment button is released, the spring applies sufficient force to maintain cord position stability through the adjusting element. During active adjustment, the button pressure temporarily overcomes the spring force, allowing free movement of the slider. This parameter optimization resolves the contradiction between operational ease and position stability.
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 device allows for effortless length adjustment of cords, maintaining stability and preventing unwanted movement, reducing fatigue and extending the device's lifespan by minimizing friction and wear.
Implementation Method 1
a spring (26) arranged between the two parts (10, 20), wherein the spring (26) pushes the insert part (20) against the cord (4)
Implementation Method 2
The guide grooves (28) have elements for deflecting and inhibiting the movement of a cord through the guide grooves (28)
Data Source
Figure 1~3
Figure 4~6c
Figure 7~8
AI summary
A device (3) for adjusting the length of a cord (4) for carrying a wind instrument has two nested parts (10, 20), the first, cup-shaped part (10) having a recess (13) and four openings (14, 15), and the second part, an insert (20) having a groove (24) with a reversal, a recess (23), and two guide grooves (28). A cord segment (4a) is guided around the groove, out of the device, and through an eyelet of a hook. Another cord segment (4b, c) is guided through the guide grooves (28) and the four openings (14, 15). The device (3) allows the cord segment (4a) to be guided through the groove (24) in a manner that is completely separate from the guidance of cord segments (4b, 4c) through the guide grooves. The guide grooves (28) contain elements (29) for deflecting and inhibiting the movement of the cord sections. The device (3) enables stable and twist-proof handling of the length adjustment of the cord (4).The device prevents the cord length from changing on its own, even when the cord is not taut.