Knitted Safety Helmet Strap with Mechanical Failure Indicator
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Solution Overview
Problem
Existing safety devices, such as safety helmets, rely on electronic components that require batteries and increased costs, posing a risk of failure if the battery drains and lacking a reliable non-electronic method to indicate damage.
Innovation Solution
A strap with a failure indicator is developed, comprising a main body structure formed by knitting and integrated second yarns that elongate and do not break under a predetermined tensile force, forming a failure indicating loop after the force is released.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components (sensor, circuitry, battery, LED) are used to provide visual indication of damage, then the reliability of damage detection is improved, but the device complexity and cost increase, and the system becomes vulnerable to battery failure
Solution Approach 1:
The patent removes all electronic components (sensors, circuitry, battery, LED) from the safety helmet system and replaces them with a purely mechanical indicator mechanism. The extraction principle eliminates the complex electronic subsystem while retaining the core function of damage indication through a simple mechanical protrusion mechanism that activates when impact forces exceed threshold values.
Solution Approach 2:
The mechanical indicator components are designed to be simple, inexpensive, and potentially replaceable. The indicator mechanism uses basic mechanical elements that can be manufactured at low cost and replaced if needed, contrasting with the expensive and complex electronic system it replaces.
2Measurement precision
If electronic components are used to monitor impact, then the measurement precision of impact detection is improved, but the cost of the safety helmet increases
Solution Approach 1:
The patent applies the reverse of the typical substitution principle - instead of replacing mechanics with electronics, it uses a mechanical system to achieve what electronics would do. The mechanical indicator mechanism provides sufficient impact detection precision without the need for electronic sensors, circuitry, or processing, thereby reducing manufacturing cost while maintaining adequate measurement capability.
3Illumination intensity
If a battery-powered warning device is used, then the visibility of warning signal is improved, but the duration of action is limited by battery life
Solution Approach 1:
The mechanical indicator system is self-service in that it requires no external power source or maintenance. The indicator protrudes automatically when impact forces are exceeded and remains in that state until manually reset, providing indefinite duration of action without battery replacement or recharging.
Solution Approach 2:
The battery and power supply system are completely extracted from the design, eliminating the fundamental limitation of finite energy storage. The mechanical indicator achieves warning signal visibility through physical protrusion rather than illumination, removing the battery life constraint entirely.
4Reliability
If electronic monitoring systems are implemented, then the reliability of safety indication is improved, but the loss of energy through battery consumption occurs
Solution Approach 1:
The patent replaces the electronic monitoring system with a passive mechanical indicator that responds to impact forces directly. This substitution eliminates continuous energy consumption associated with electronic sensors, signal processing, and LED operation, while maintaining safety indication reliability through force-activated mechanical protrusion.
Solution Approach 2:
The mechanical indicator system is self-actuating through impact forces itself, requiring no external energy input. The system uses the impact energy directly to activate the indicator mechanism, eliminating battery energy consumption while maintaining reliable safety indication.
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 solution provides a reliable, battery-free, and cost-effective means to visually indicate whether a safety device has experienced stretching, impact, or damage, ensuring user safety without the limitations of electronic systems.
Implementation Method 1
the main body structure and the second yarn are elongated and do not break under a predetermined amount of a tensile force, and after the tensile force is released, the main body structure retracts
Implementation Method 2
the second yarn does not retract due to occurred plastic deformation, such that the length of the main body structure is shorter than the length of at least one second yarn that has slid
Data Source
AI summary
A strap with a failure indicator and a safety device including the strap. The strap comprises: a main body structure formed by knitting; and one or more second yarns integrated straight into the main body structure in the length direction of the main body structure along the entire length of the main body structure and at least partially fixed to the main body structure, wherein the main body structure and the second yarn are selected such that the main body structure and the second yarn are elongated and do not break under a predetermined amount of a tensile force, and after the tensile force is released, the main body structure retracts, such that at least one second yarn at least partially protrudes from a plane of the main body structure to form a failure indicating loop. The safety device comprises a component formed by the strap with a failure indicator.