Adjustable Friction Joint Assembly for Crash Test Dummies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current crash test dummy joints lack sufficient friction, rely on operator feel for tightness adjustment, and are limited to specific joints, leading to over-tightening and loosening issues during movement.
Innovation Solution
An adjustable friction joint assembly with a shaft connecting two joint members, featuring an adjustable friction assembly that provides mechanical adjustment for tightness, visual feedback, and resistance to loosening, allowing use across various joints on the crash test dummy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operator feel is used to determine joint tightness, then the joint can be assembled, but novice operators frequently over tighten the joint
Solution Approach 1:
The patent incorporates visual feedback mechanisms including a gap indicator that shows when the friction adjustment is at the correct 1g setting, and a flush indicator that shows when the joint is properly tightened. These visual cues eliminate guesswork and prevent over-tightening by providing clear feedback on the assembly state.
Solution Approach 2:
The joint assembly is designed to be self-regulating through its friction adjustment mechanism that automatically provides the correct amount of friction when properly assembled. The self-friction feature and visual indicators work together to make the assembly process self-correcting, reducing reliance on operator skill.
2Device complexity
If a small contact area is used to generate friction in the joint, then the joint structure is compact, but the joint can loosen with movement
Solution Approach 1:
The patent employs a dynamic friction adjustment mechanism that allows the friction level to be modified based on operational requirements. The adjustable friction assembly can be tuned to provide optimal friction levels, and the self-friction feature maintains consistent friction during joint movement, preventing loosening while keeping the structure compact.
3Device complexity
If a fixed friction joint design is used, then the joint structure is simple, but it only applies to a particular type of joint such as a knee joint
Solution Approach 1:
The patent designs a universal joint assembly that can be applied to multiple joint types including knee, elbow, and shoulder joints. The standardized friction adjustment mechanism and modular design allow the same basic joint structure to be adapted to different anatomical locations and movement requirements, enhancing versatility without significantly increasing complexity.
4Device complexity
If operator feel is used for tightness adjustment, then no additional adjustment mechanism is needed, but visual feedback is lacking for precise setting location
Solution Approach 1:
The patent incorporates multiple visual feedback indicators including a gap indicator that displays the friction adjustment setting, a flush indicator that shows when the joint is properly tightened, and a pin indicator that reveals when pins are engaged. These indicators provide precise visual cues for achieving the correct 1g setting without requiring complex adjustment mechanisms.
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 adjustable friction joint assembly enhances sensitivity and stability, prevents loosening, and allows precise '1 g' setting adjustment, enabling effective interaction with vehicle interiors and broader joint application.
Implementation Method 1
an adjustable friction assembly operatively connected to the shaft and operatively cooperating with the first joint member and the second joint member to adjust a friction tightness of the joint assembly
Data Source
AI summary
An adjustable friction joint assembly for a crash test dummy includes a first joint member for connection to a first member of the crash test dummy and a second joint member for connection to a second member of the crash test dummy. The adjustable friction joint assembly also includes a shaft operatively connected to the first joint member and the second joint member to allow rotation therebetween. The adjustable friction joint assembly further includes an adjustable friction assembly operatively connected to the shaft and operatively cooperating with the first joint member and the second joint member to adjust a friction tightness of the joint assembly.