Tamper-Resistant Screw Locking Assembly Against Unauthorized Removal
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Solution Overview
Problem
Conventional tamper-resistant screws can be detached by unauthorized professionals using custom-made drivers, posing safety risks and invalidating warranties due to improper disassembly.
Innovation Solution
A tamper-resistant system comprising a tamper-resistant screw with a unique head, thread, and groove design, combined with a lock member and nut assembly that engages locking blocks, and a specialized detaching tool with movable hooks and elastic members to securely fasten and detach the screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tamper resistant screw with a special head shape is used, then the screw resistance to unauthorized disassembly is improved, but the screw can still be detached by professionals who manufacture custom drivers, compromising safety and warranty
Solution Approach 1:
The screw is divided into functionally distinct segments: a head portion for driving, a thread portion for fastening, and a tip portion with a groove for locking engagement. This segmentation allows each portion to perform its specific function optimally while contributing to overall tamper resistance
Solution Approach 2:
The screw head features an asymmetric recess shape that does not correspond to any standard driver, creating an asymmetric interface that prevents unauthorized access. This asymmetric design ensures that only a specifically designed detaching tool with the matching asymmetric head can operate the screw
Solution Approach 3:
The tip portion of the screw with its groove is nested within the deformable opening of the lock member. When the screw is fully inserted, the tip engages with the locking blocks through the deformable opening, creating a nested configuration that locks the screw in place and prevents unauthorized removal
2Reliability
If a specialized lock member with locking blocks and deformable opening is added to the screw system, then the tamper resistance and safety are improved, but the device complexity increases
Solution Approach 1:
The lock member integrates multiple functions into a single component: it provides the deformable opening for tip engagement, houses the locking blocks for groove engagement, and incorporates the nut for thread engagement. This merging reduces the number of separate parts while maintaining the locking mechanism's effectiveness
Solution Approach 2:
The lock member is designed to automatically engage and lock when the screw is properly inserted. The deformable opening flexes to allow tip insertion, then the locking blocks automatically engage with the groove, and the nut threads onto the screw, creating a self-locking mechanism that requires no additional assembly steps or external tools
3Object-affected harmful factors
If a nut and cover are added to cover the deformable opening and engage with the lock member, then the protection against unauthorized access is improved, but the ease of manufacture decreases
Solution Approach 1:
The nut and cover are pre-configured in specific positions relative to the lock member during assembly. The nut is positioned to engage the thread portion, and the cover is positioned to cover the deformable opening. This preliminary positioning ensures proper engagement without requiring complex alignment procedures during final assembly
Solution Approach 2:
The cover serves as an intermediary component that protects the deformable opening and locking mechanism from unauthorized access. It acts as a barrier between the external environment and the internal locking components, while still allowing the screw tip to pass through and engage during proper assembly
4Reliability
If a proprietary detaching tool with movable hooks and elastic members is designed, then the control over authorized disassembly is improved, but the ease of operation and availability of tools worsens
Solution Approach 1:
The detaching tool incorporates movable hooks that can dynamically adjust their position and the elastic members that provide flexible, spring-loaded engagement. This dynamic design allows the tool to adapt to the screw's head geometry and apply force effectively, while still requiring the proprietary tool design for proper operation
Solution Approach 2:
The detaching tool is designed with multiple functional components: the driver portion engages the screw head recess, the movable hooks engage the screw flanks for extraction, and the elastic members provide continuous contact force. This multi-functionality consolidates multiple operations into a single tool, reducing the need for multiple specialized tools while maintaining security
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
Prevents unauthorized detachment of the screw using standard drivers, ensuring safety and maintaining warranty validity by requiring the proprietary detaching tool for disassembly.
Implementation Method 1
a first elastic member and a second elastic member. The clamping member is disposed on the driver and the clamping member comprises a plurality of movable hooks
Data Source
AI summary
A tamper resistant assembly applied to a tamper resistant system includes a tamper resistant screw, a housing, a lock member, a nut and a cover. The tamper resistant screw includes a head, a thread, a groove and a tip. The lock member is disposed in the housing. The lock member includes a plurality of locking blocks, wherein a deformable opening is formed between the locking blocks. The nut is disposed in the housing and covers the deformable opening. The cover is disposed in the housing. The nut is located between the lock member and the cover. When the tip of the tamper resistant screw passes through the cover and the nut sequentially and enters the deformable opening, the nut is separated from the deformable opening and the locking blocks engage with the groove. Furthermore, a detaching tool is provided to detach the tamper resistant assembly.