Fixed-Position Inductive Key Reader for Rotation-Free Access Control
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Solution Overview
Problem
Existing electronic lock cylinders with rotatable plugs increase cost and complexity due to the need for complex wiring and mechanical shear lines, and traditional key systems are limited in key management and rekeying capabilities.
Innovation Solution
A fixed-position access control device with inductive sensors for key bitting detection, allowing electronic lock operation without key rotation, enabling simpler wiring and instantaneous rekeying, and supporting various key combinations without mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotatable plug configuration is used in electronic lock cylinders, then the key can be read electronically and the plug can rotate when authorized, but the cost and complexity of the lock cylinder increases
Solution Approach 1:
The patent extracts the rotatable plug from the traditional lock cylinder configuration. Instead of having a plug that rotates within a shell, the invention uses a fixed sensor assembly that reads the key code while the key remains stationary. This separates the key reading function from the mechanical rotation function, thereby reducing device complexity while maintaining electronic key reading capability.
Solution Approach 2:
The patent replaces the mechanical plug rotation system with an electronic sensing system. Instead of using mechanical shear lines and rotatable components to authenticate and actuate the lock, the invention uses inductive sensors to read the key code electronically and triggers an electronic lock mechanism, eliminating complex mechanical wiring and moving parts.
2Ease of operation
If traditional mechanical key systems are used, then the key can physically operate the lock, but key management and rekeying capabilities are limited
Solution Approach 1:
The patent incorporates sensors that read the key code and provide feedback to a control system. This allows the system to verify the key code against authorized codes, track key usage, and manage access permissions electronically. The feedback mechanism enables advanced key management capabilities such as logging, authorization levels, and remote control that are not possible with traditional mechanical systems.
Solution Approach 2:
The patent creates a multi-functional system that combines traditional key insertion with electronic reading and control capabilities. The same key that physically inserts into the lock also carries an encoded identity that can be read, verified, and used for electronic access control, key management, and authorization tracking. This universal approach allows a single key to serve multiple functions beyond simple mechanical operation.
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
Facilitates conversion to electronic access control systems using existing keys, reduces complexity and cost, and enhances key management flexibility.
Implementation Method 1
the first sensor assembly is an inductive sensor configured to generate root depth information
Data Source
AI summary
An exemplary system includes a mechanical key and an access control device. The access control device includes a housing defining a keyway that has a fixed position within the housing. The access control device further includes a root depth sensor assembly, an insertion depth sensor assembly, a control assembly in communication with the sensor assemblies, and an electronic lock device. The control assembly is configured to determine the bitting code of the mechanical key based upon information received from the sensor assemblies, to compare the bitting code of the mechanical key to a lock/unlock bitting code; and to transmit a lock/unlock command in response to the bitting code matching the lock/unlock bitting code. The electronic lock device is configured to transition between a locked state and an unlocked state in response to receiving the lock/unlock command and without requiring rotation of the mechanical key.