Rolling Cam Lock Mechanism for Tamper-Resistant Door Security
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Solution Overview
Problem
Conventional locks used for securing doors and lockers are vulnerable to tampering due to accessible penetrating members and loose fits between door and doorjamb, making them easily defeatable.
Innovation Solution
A lock system featuring a post with a shaft, neck, and head, combined with a rolling cam that rotates to secure the post, ensuring the door is locked by aligning the opening with the post to prevent movement, utilizing a securing portion to hold the post in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a penetrating member is used to connect door and doorjamb, then the lock can secure the door, but the penetrating member becomes easily accessible to tampering
Solution Approach 1:
Instead of having the locking member penetrate from the door into the doorjamb (conventional approach), the invention inverts the arrangement by having the cam member rotate within the doorjamb to engage with the locking member that remains within the door. This inversion makes the critical locking interface inaccessible from the outside while maintaining secure locking functionality.
2Reliability
If the penetrating member is used to connect door and doorjamb, then the lock can secure the door, but the fit between penetrating member and doorjamb becomes loose allowing movement
Solution Approach 1:
The invention replaces the static penetrating member with a dynamic rotating cam mechanism. The cam member rotates about an axis perpendicular to the doorjamb surface, allowing it to dynamically engage and disengage with the locking member. This dynamic engagement provides precise control over the locking state while eliminating loose fits and unwanted movements between door and doorjamb.
3Device complexity
If a simple penetrating shaft is used, then the lock structure remains simple, but the lock can be easily defeated
Solution Approach 1:
The invention introduces a curved cam surface on the cam member that rotates to engage with the locking member. The cam surface features a curved profile that provides mechanical advantage and controlled engagement, transforming the simple linear motion of a basic shaft into a more complex rotational motion with enhanced security properties while maintaining reasonable structural simplicity.
Data Source
AI summary
A lock and method of locking a lockable volume is described. The lock may be located on a door of a lockable volume, such as a locker configured to hold an item. The lock may comprise a post and a cam, the cam having an opening corresponding to the size and shape of the post. The cam is rotatable about an axis, wherein the rotation of the cam about the axis releasably secures the post within the opening, thereby locking the door to which the post is attached.