Tamper-Resistant Lock With Spring-Loaded Key Mechanism
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Solution Overview
Problem
Conventional locking systems are vulnerable to tampering and picking, as they can be easily opened using common tools or bypassed without the proper key, posing a security risk for valuable items and public utilities.
Innovation Solution
A tamper-resistant locking system featuring a cylindrical lock body with external threading and a bore with an engagement feature, combined with a unique key design including a collar, retractable engagement member, and spring mechanism, which provides multiple layers of security by resisting traditional tool engagement and requiring proper key alignment for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional locks are used, then ease of operation is improved, but security reliability deteriorates
Solution Approach 1:
The lock employs a dynamic cam mechanism that rotates between locked and unlocked positions. The cam's asymmetric profile creates different mechanical states: in the locked position, the cam engages the bolt to prevent opening; in the unlocked position, the cam retracts the bolt. This dynamic transformation allows the lock to provide high security in the locked state while remaining operable with the correct key in the unlocked state.
Solution Approach 2:
The lock is divided into distinct functional segments: the key cylinder for authentication, the cam mechanism for state transformation, the bolt for physical blocking, and the housing for structural support. This segmentation allows each component to be optimized independently - the key cylinder provides security while the cam and bolt provide the locking action, and the spring provides automatic resetting functionality.
2Device complexity
If traditional locking mechanisms are used, then device complexity is reduced, but tamper resistance deteriorates
Solution Approach 1:
The lock incorporates preliminary anti-tamper measures through its design: the key cylinder requires authenticated key insertion before any locking mechanism can be actuated, the cam mechanism is positioned to prevent direct access to the bolt from the outside, and the spring-loaded system automatically resets to the locked position if tampering is detected. These preliminary defenses prevent tampering before it can succeed.
Solution Approach 2:
The cam mechanism serves as an intermediary between the key cylinder and the bolt. Instead of the key directly controlling the bolt, the key first actuates the cam, which then transforms rotational motion into linear bolt movement. This intermediary adds a layer of complexity that prevents direct manipulation of the bolt while maintaining operational simplicity through the cam's mechanical advantage.
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
The system significantly enhances security by making it difficult to pick or remove the lock without the proper key, providing a higher level of tamper resistance and protection against unauthorized access.
Implementation Method 1
a spring disposed within the collar
Implementation Method 2
The retractable engagement member is sized and shaped to interact with the engagement feature when the retractable engagement member is in an extended position
Data Source
AI summary
A locking system includes a tamper-resistant lock and key. The tamper-resistant lock includes a cylindrical lock body with external threading on at least a portion thereof and a bore extending into an end of the cylindrical lock body. The bore includes an engagement feature disposed on the wall that defines the bore, and the engagement feature is disposed a particular distance away from the bore opening. The key includes a collar that has a cylindrical key body that fits within the bore of the cylindrical lock body. The cylindrical key body also includes an opening defined by the collar sidewall, a retractable engagement member at least partially disposed within the opening, a spring disposed within the collar, and a plunger disposed within the collar that is operable to engage the spring and has a recess sized and shaped to accommodate the retractable engagement member.


