Elastic Arm Cam Lid Strap Adjustment Mechanism
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Solution Overview
Problem
Conventional ratchet strap adjustment systems rely on metal springs, which can deform and disengage over time, reducing buckle reliability.
Innovation Solution
A strap adjustment system using a housing with elastic arms and a cam lid that replaces metal springs, allowing incremental length adjustment without deformation, featuring a ratchet strap with triangular teeth and a locking mechanism that engages and disengages with the cam lid's elastic arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal springs are used in the ratchet adjustment mechanism, then the locking and releasing function is achieved, but the reliability deteriorates over time due to deformation and disengagement
Solution Approach 1:
The patent removes the metal spring component from the ratchet adjustment mechanism entirely. Instead of using a metal spring to provide locking force, the invention employs a plastic component with inherent elasticity or a cam mechanism that achieves the same locking and releasing function without relying on metal springs, thereby eliminating the reliability issues associated with spring deformation and disengagement over time
Solution Approach 2:
The patent replaces the durable but unreliable metal spring with a plastic component that may have a shorter service life but provides consistent reliable performance during its operational period. The plastic component is designed to maintain its elastic properties and locking force without the degradation issues that plague metal springs under repeated cycling
2Reliability
If multiple separate pieces and metal springs are used, then the ratchet locking function is achieved, but the device complexity increases
Solution Approach 1:
The patent integrates the locking mechanism, elastic element, and ratchet components into a more unified structure. The plastic component serves multiple functions simultaneously - providing both the elastic force for locking and the structural framework for the mechanism, thereby reducing the total number of separate pieces while maintaining or improving reliability
Solution Approach 2:
The plastic component in the patent is designed to perform multiple functions: it provides elastic force for locking, structural support for the mechanism, and potentially guides the ratchet movement. This multi-functionality reduces the need for separate dedicated components, simplifying the overall device while achieving reliable ratchet locking
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 system provides reliable, metal-spring-free incremental adjustment of strap length, enhancing durability and manufacturing simplicity while accommodating varying fabric thicknesses.
Implementation Method 1
two elastic arms extending under the bottom surface... The elastic arms have a sloped contour, which slide against a correspondingly sloped contour on the sides of cam lid, to rotate the cam lid downward, which then compresses the elastic arms of the cam lid against the bottom of the housing... the spring force of the compressed elastic arms of the cam lid force the cam lid back into its original locked position
Data Source
Figure 1
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Figure 4~5
AI summary
An adjustment system has a housing, a cam lid and a ratchet strap. The housing has an elastic arm connected to each one of its side walls, a front opening and a rear opening. The cam lid is rotatably connected to the side walls of the housing, and has two elastic arms extending under the bottom surface, and a locking element disposed in an interior cavity of the cam lid. The cam lid locks the ratchet strap to the housing when the ratchet strap is fed through the housing and cam lid so that the locking element engages teeth on the ratchet strap. Pressing the elastic arms of the housing toward each other presses against the sides of the cam lid and causes the cam lid to rotate and release the locking element from the teeth of the ratchet strap.