Palm-Mounted Spike Plate for Intuitive Defense and Evidence Capture
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Solution Overview
Problem
Existing self-defense devices either require training to use effectively, restrict finger mobility, lack evidence-preserving capabilities, or fail to provide clear proof of attack, making them impractical for intuitive and deterrent self-defense.
Innovation Solution
A hand-operated self-defense device with a support plate element on the palm featuring protruding tip elements for pain induction, integrated evidence-preserving means, and optional deterrent features like audible/visual warnings or skin-irritating fluids, designed for immediate use and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glove-like hand protector with a bar-like element is used, then the attacker feels strong pain and the attacked person can escape, but the mobility of the fingers is restricted
Solution Approach 1:
The device divides the hand into two functional zones: the palm area is covered with a rigid support plate element for delivering impactful blows, while the finger areas remain exposed and free-moving. This segmentation allows the palm to provide defensive strength through concentrated impact points while the fingers maintain full mobility for gripping and evasive movements.
Solution Approach 2:
The support plate element is positioned specifically on the palm surface where impact force is most effective, rather than covering the entire hand. This local placement provides targeted defensive capability at the palm while leaving the fingers unrestricted. The rigid support plate creates localized high-impact areas that maximize pain induction in the attacker while minimizing restriction on finger movement.
2Strength
If a glove-like hand protector is used, then the attacked person can fend off physical attack, but clear proof of attack cannot be provided
Solution Approach 1:
The device introduces an intermediary evidence collection mechanism between the defensive blow and the legal process. The support plate element or accompanying components can collect and preserve biological evidence (blood, tissue, hair) from the attacker during the defensive encounter, serving as an intermediary that bridges the physical defense with legal proof requirements.
Solution Approach 2:
The device creates a permanent record or copy of the attack event through evidence preservation capabilities. By capturing and retaining biological materials transferred during the defensive encounter, the device produces a durable copy of the attack that can be presented as proof, separate from the temporary physical effects on the attacker.
3Adaptability or versatility
If multiple defense features are integrated into a glove, then various defense situations can be addressed, but repeated training is required to use them correctly
Solution Approach 1:
The invention extracts the essential defensive function from complex multi-featured gloves and isolates it into a simple support plate element on the palm. By removing unnecessary features and focusing on the core impact-delivery function, the device achieves versatility through its simple design rather than through multiple specialized components that would require training.
Solution Approach 2:
The device is designed to be self-explanatory through its simple, intuitive structure. The support plate element naturally positions itself on the palm and delivers impact automatically when the user pushes or strikes, requiring no complex controls or trained muscle memory. The device serves itself by converting natural hand movements into effective defensive blows without requiring learned techniques.
4Strength
If the support plate element is positioned for optimal impact transmission, then defensive effectiveness is maximized, but the device cannot be used effectively for pushing attacks
Solution Approach 1:
The support plate element is designed to serve multiple defensive functions: it can deliver impactful punches when the palm is extended, and it can also be used to push or shove attackers when the hand is in a pushing position. The same rigid plate structure provides structural support for both types of attacks, making the device universally applicable to different defensive scenarios without requiring position-specific components.
Data Source
Figure 1a~1b
Figure 2
Figure 3~6b
AI summary
A hand-operated self-defense device (1) comprises a first strap element (11) for attachment to the palm of the hand, a second strap element (12) for attachment to the wrist, a connecting element (2) for connecting the first strap element (11) to the second strap element (12), and a defense element (3) connected to the connecting element (2) or the first strap element (11). The defense element (3) comprises a support plate element (4) which contains a plurality of spike elements (5) arranged on the support plate element (4) such that they span a surface.