Concealable Self-Defense Device with Rotating Stake
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Solution Overview
Problem
Existing nonlethal personal protective devices, such as tactical pens and stun guns, are often prohibited as carry-on items in air travel and lack a discreet yet effective mechanism for inflicting pain without causing serious injury.
Innovation Solution
A protective device with a grip, a stake, and a flexible loop that allows the user to conceal it within their palm, enabling the stake to be directed against an attacker by shifting it from a concealed position to an exposed one, providing a compact and versatile means of self-defense.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device is made concealable in the palm, then portability and discretion are improved, but the ability to effectively direct the stake against an attacker is worsened
Solution Approach 1:
The stake is designed to be rotatable relative to the grip, allowing dynamic repositioning of the pointed end. The user can rotate the stake to orient the point toward an attacker while keeping the grip concealed in the palm, resolving the contradiction between small size and effective directional control.
2Object-affected harmful factors
If the device is designed to inflict pain without serious injury, then nonlethal effectiveness is improved, but the deterrent capability against determined attackers is worsened
Solution Approach 1:
The stake point is designed with specific geometric parameters - sufficiently pointed to inflict pain but with controlled dimensions to avoid deep penetration. The grip dimensions and stake length are optimized to deliver painful impact while limiting the ability to cause fatal injuries, balancing pain infliction with safety.
3Ease of operation
If the device includes a flexible loop for attachment, then ease of carrying and repositioning is improved, but device complexity is worsened
Solution Approach 1:
A flexible loop made of thin material is attached to the grip, allowing the device to be easily secured to a finger or repositioned within the palm. This simple flexible component adds minimal structural complexity while significantly improving ease of carrying and device positioning.
Data Source
AI summary
A protective device includes a grip having a non-slip surface, a stake projecting from said grip and terminating in a blunt point, point; and a flexible loop projecting from said grip, which is sufficiently long that a user can loop it over a finger to attach the device to the user's hand, and such that it all user's repositioning of the device in a user's palm, whereby the device can be generally concealed within a user's palm, but shifted within his or her palm such that said point of said stake is exposed and can be directed against an attacker to inflict pain and discourage further advances.