Concealed Locking Groove Nut Structure Against Key Replication
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Solution Overview
Problem
Existing anti-theft bolts with exposed keyholes are vulnerable to key replication, leading to low anti-theft performance.
Innovation Solution
An anti-theft hand twisted nut structure featuring a hollow housing with a flat channel and a locking member, including a nut assembly and a locking disc, where the locking groove is obscured by the channel, allowing rotation to an unobservable position, enhancing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the keyhole is exposed for key insertion, then the ease of operation is improved, but the security against key replication deteriorates
Solution Approach 1:
The patent introduces a locking pin as an intermediary component between the keyhole and the locking mechanism. The locking pin can be rotated by the key to engage or disengage the locking groove, mediating the interaction between the user and the locking system while protecting the keyhole's position information
Solution Approach 2:
The patent adds a rotational dimension to the keyhole structure. Instead of a simple linear insertion, the keyhole requires rotational movement of the locking pin, transforming the operation from a one-dimensional insertion to a two-dimensional rotational insertion, which obscures the effective keyhole position
2Reliability
If the locking groove shape is made complex to prevent replication, then the security is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent extracts the complex locking groove shape from the visible exterior and places it inside the housing, hidden from external observation. Only the simple keyhole and locking pin interface remain exposed, separating the security function (complex internal groove) from the operation interface (simple external keyhole)
Data Source
AI summary
The present disclosure discloses an anti-theft nut, where a channel is provided on one side of a housing, a nut assembly includes a nut body and a locking disc. An upper end face of the locking disc is coaxially provided with a first annular rail, an edge of the upper end face of the locking disc is further provided with a locking groove, a shape of the locking groove matches with a shape of a locking clamp. A lower end of a locking member is provided with a group of mirror symmetrical sliding platforms, which are installed in the first annular rail. An upper end of the locking member is connected to an inner top surface of the housing. The locking clamp is slidably inserted into the locking groove through the channel and one side of the locking clamp is contact with sides of two sliding platforms.