Catalytic Converter Security Cage with Chain Attachment
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Solution Overview
Problem
Catalytic converter theft is prevalent due to the high value of metals like platinum, rhodium, and palladium, and existing theft deterrent systems are ineffective against experienced thieves.
Innovation Solution
A security device that encloses the catalytic converter in a mini-mesh wire cage and secures it to the vehicle frame with attachment hardware, including a security chain, to make removal more difficult and time-consuming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DIY security systems are used, then installation is simple and inexpensive, but they are ineffective against experienced thieves
Solution Approach 1:
The catalytic converter is nested within a cage structure made of metal bars, creating a protective enclosure. The converter sits inside the cage with clearance space, and the cage is further secured to the vehicle frame through hasps and chains, creating multiple nested layers of protection that progressively increase theft difficulty.
Solution Approach 2:
The security device is segmented into distinct functional components: the cage structure made of multiple metal bars, separate hasps for attachment, security chains for frame connection, and locking mechanisms. This segmentation allows each component to perform its specific function while contributing to overall security effectiveness.
2Reliability
If the catalytic converter is protected with a cage and security chains, then theft becomes more difficult and time-consuming, but the device complexity increases
Solution Approach 1:
The cage structure serves multiple functions simultaneously: it physically encloses the catalytic converter, provides attachment points for hasps and chains, creates noise barriers, and serves as a visual deterrent. The metal bars both contain the converter and provide structural framework for the security attachment system.
Solution Approach 2:
The invention merges the protective cage structure with the security attachment system (hasps and chains) into a single integrated device. The cage is not merely a container but is structurally combined with the hasps that attach it to the vehicle frame, creating a unified security assembly rather than separate components.
3Ease of operation
If thieves use portable saws to cut through pipes, then converter removal is fast and easy, but the security device adds cutting resistance through multiple components
Solution Approach 1:
The cage structure acts as an intermediary barrier between the thief's cutting tools and the catalytic converter. Instead of directly cutting the converter or its connecting pipes, thieves must first cut through multiple metal bars of the cage, which serves as a mediating obstacle that increases time and effort before reaching the target component.
4Reliability
If the security device requires cutting through multiple components, then theft becomes more laborious and noisy, but installation complexity increases
Solution Approach 1:
The cage structure is pre-fabricated as a complete assembly with integrated hasps and attachment points before installation on the vehicle. The metal bars are pre-positioned and connected to form the enclosing structure, and the hasps are pre-attached to the cage framework, reducing on-site assembly complexity and enabling faster installation.
Data Source
AI summary
A security device to deter catalytic converter theft is a wire mesh flexible cage wrapped around a catalytic converter of a vehicle. A frame chain is secured to a vehicle frame and extends to secure to a shoulder bolt, which projects outward from a hasp tube. A shear nut is secured to a distal end of the shoulder bolt. Two fender washers may be on the shoulder bolt—one adjacent to the shear nut and the other adjacent an end of the hasp tube out of which projects the shoulder bolt. The portion of the frame chain that is secured to the shoulder bolt is sandwiched between the two fender washers. The hasp tube is part of a hasp, which has plates secured to the wire mesh of a portion of the flexible cage underneath.