Dovetail Bracket Locking for Theft-Resistant Marine Displays
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Solution Overview
Problem
The theft of audio/video devices, such as fish finders and navigation devices, is prevalent due to the lack of effective locking mechanisms on their mounting brackets, with existing solutions being easily broken or bypassed by thieves using blunt force or tools.
Innovation Solution
An anti-theft device featuring a hexagonal configuration with a female and male housing portion, a push button cam lock, and a bolt system that secures the device to the bracket, utilizing a dovetail interconnection and lock pins to prevent detachment, and includes washers and a spring pin for added stability and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to the mounting bracket, then security against theft is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is nested within the mounting bracket structure itself. The lock body is received within the bracket housing, and the lock pin integrates with both the bracket and the device mounting interface. This nesting approach provides security functionality while maintaining a compact, integrated design that does not significantly increase overall device complexity.
Solution Approach 2:
The locking mechanism merges multiple functions into a single integrated system: the mounting bracket simultaneously provides structural support, device attachment, and locking functionality. The lock pin serves dual purposes by both securing the device to the bracket and preventing bracket rotation. This merging reduces the need for separate components and simplifies the overall system.
2Strength
If a durable locking mechanism is used, then resistance to breaking is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The mounting bracket and locking mechanism utilize composite construction combining metal components (bracket housing, lock body, lock pin) with molded plastic elements (lock cover, internal structural components). This composite approach provides the strength and durability needed to resist breaking while allowing portions of the structure to be manufactured using cost-effective molding processes, balancing manufacturability with structural integrity.
Solution Approach 2:
The locking mechanism is segmented into distinct components (lock body, lock pin, lock cover) that can be manufactured separately using optimized processes for each material and function, then assembled together. This segmentation allows metal parts to be forged or machined for strength while plastic parts are molded for complexity and cost-effectiveness, resolving the contradiction between durability and ease of manufacture.
3Reliability
If the locking mechanism prevents easy removal, then theft deterrence is improved, but the ease of operation deteriorates
Solution Approach 1:
The lock pin acts as an intermediary element between the user and the device mounting system. When the bracket rotation is prevented, the lock pin provides a clear visual and physical indicator of the locked state, allowing users to easily understand the security status without complex indicators or interfaces, thus maintaining ease of operation while ensuring theft deterrence.
4Reliability
If the bracket rotation is prevented, then security is improved, but the device complexity increases
Solution Approach 1:
The bracket features an asymmetric slot geometry with a specific orientation that works with the lock pin to prevent rotation. The slot is positioned and shaped such that it naturally guides the bracket into a single correct orientation, and the lock pin engages with asymmetric features on the bracket arm. This asymmetric design provides anti-rotation security through the geometry itself rather than requiring additional mechanical components, thus improving security while minimizing increases in device complexity.
Data Source
AI summary
An anti-theft device for use in deterring theft of an audio/video device mounted to a bracket which has a male and female housing with a dovetail connection.