Wrist-Mounted Self-Defense Device with Spring-Loaded Blade
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Solution Overview
Problem
Existing self-defense devices are often ineffective in close contact attacks, requiring skill or strength, and are not designed for instinctive use, especially when the victim is restrained from behind.
Innovation Solution
A wearable self-defense device featuring a collapsible handle and blade, designed for easy deployment and use with a pulling or clawing motion, incorporating a hook-shaped blade and a spring-loaded mechanism for quick extension and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional self-defense devices are used, then they require skill or strength to operate, but this limits their usefulness in panic situations
Solution Approach 1:
The device is designed to be worn on the wrist where it can be automatically deployed without requiring complex manipulation. The spring-loaded mechanism automatically extends the blade when the protective cap is removed, and the tether automatically reconnects the blade to the handle after deployment, making the entire system self-servicing and eliminating the need for skillful operation during panic situations
2Speed
If self-defense devices are carried in a pocket or purse, then they are compact, but the user cannot access them quickly enough in sudden attacks
Solution Approach 1:
The device is segmented into wearable components: a wrist-mounted handle unit and a separate blade unit connected by a tether. This segmentation allows the main body to remain compact on the wrist while the blade can be quickly deployed when needed, achieving both compactness and rapid accessibility
Solution Approach 2:
The device is pre-positioned on the wrist in a ready state, with the blade retracted and protected by a cap. This preliminary positioning eliminates the need to search for or retrieve the device during an attack, as it is already in the optimal location for immediate deployment
3Productivity
If a blade is made accessible for quick deployment, then it can be used immediately, but it could be dropped or turned against the user under duress
Solution Approach 1:
A protective cap covers the blade in the retracted position, preventing accidental deployment or injury to the user. The tether connecting the blade to the handle acts as a safety mechanism that prevents the blade from being completely separated or dropped, providing beforehand protection against misuse while maintaining immediate deployment capability
4Volume of moving object
If the device is made compact and visually unobtrusive, then it is tolerable to wear, but it may be difficult to deploy quickly
Solution Approach 1:
The blade is extracted from the wrist-mounted handle unit and connected via a tether, allowing the handle to remain compact and wearable while the blade can be quickly deployed by simply removing the protective cap. This separation maintains compactness during normal wear while enabling rapid deployment when needed
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 immediate and instinctive use, providing effective defense against close contact attacks, even when the user is restrained, and remains secure on the wrist to prevent seizure by an attacker.
Implementation Method 1
A spring extendable handle, which can lengthen during transfer to the hand, increases the graspable length
Data Source
AI summary
A self-defense device including a wrist-wearable wearable holder and knife detachably coupled to the wearable holder. The knife includes a handle, body, arm and blade, wherein the handle is coupled to the body and the arm is coupled to the body and blade. The handle, arm and blade are each configured to move relative to the body between retracted and extended positions. The body preferably has a substantially round perimeter and the blade has a substantially curved outer edge matching the curve of the body's perimeter. The handle, arm and blade each substantially retract into the body's round perimeter when in their retracted positions.