Conductive Fabric Strike Sensor for Self-Defense Training
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Solution Overview
Problem
Existing self-defense training targets either require a second person to hold them, providing imprecise feedback, or are stationary without feedback, and prior devices using lasers are cumbersome, expensive, and require constant calibration due to varying user sizes and strike locations.
Innovation Solution
A sensor system composed of alternating layers of conductive and non-conductive fabric, which generates electrical signals when struck, transmitting data wirelessly to a computer or mobile device for accurate measurement and display of strike speed, force, and rate without the need for additional personnel or calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a laser sensor is used to measure strike speed, then measurement precision is improved, but device complexity and cost increase, and constant calibration is required
Solution Approach 1:
The patent replaces the optical laser measurement system with a mechanical/electrical fabric sensor system. Conductive fabric layers embedded in the target generate electrical signals when contacted by a strike, eliminating the need for laser alignment and calibration while maintaining measurement capability through signal timing and amplitude analysis.
Solution Approach 2:
The conductive fabric sensor system uses inexpensive fabric materials that can be easily replaced if worn or damaged, unlike expensive laser systems that require complex calibration and maintenance. The fabric sensors are durable enough for repeated use but can be economically replaced when needed.
2Ease of operation
If a stationary target is used, then ease of operation is improved, but feedback quality deteriorates
Solution Approach 1:
The stationary target is equipped with conductive fabric sensors that detect strike characteristics and transmit data to a display system. This provides real-time feedback on strike speed, force, and location to the trainee, transforming a passive stationary target into an active feedback-providing system that maintains ease of setup while delivering valuable performance information.
3Measurement precision
If multiple conductive layers are used in the sensor, then measurement accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses composite fabric construction with alternating conductive and non-conductive layers. This layered composite structure enables differentiation between strike speed (detected by timing of signal generation across layers) and strike force (detected by signal amplitude or layer penetration depth), providing multiple measurement parameters while using standard fabric manufacturing techniques.
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 consistent, accurate, and cost-effective measurement of strike data, reducing equipment weight and risk of harm, allowing for precise feedback to self-defense training participants without the need for additional handlers or complex calibration.
Implementation Method 1
The sensor of the present invention consists of a first, second, and third layer of conductive fabric separated by a layers of perforated, non-conductive fabric. When an object strikes the first conductive fabric layer, the first layer is pushed through the perforations or openings in the first non-conductive layer into contact with the second conductive layer. When the first conductive layer contacts the second conductive layer, a start signal is generated.
Data Source
AI summary
The present invention is a device for measuring and displaying the speed, force, rate and/or frequency that an object or a body part strikes a target. The present invention includes an impact sensor, transmitter, computer and display. The sensor includes layers of alternating conductive and non-conductive material that are wrapped around the target. The conductive layers of fabric generate electrical impulses when they come into contact with each other through perforations in the non-conductive material. These signals are interpreted by the computer to derive information about the speed of the strike against the target.