Electronic Mortise Lock Cylinder for Mechanical Retrofit
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Solution Overview
Problem
Existing mechanical mortise and rim cylinder door locks are difficult to retrofit with electronic functionality, often requiring hard wiring and providing time-based access that can be inconvenient for users.
Innovation Solution
An electronically operated lock cylinder assembly that can be installed in existing mortise locks, allowing for wireless operation via RFID, NFC, Bluetooth, or keypad, and featuring a control assembly with a rotatable knob that retracts both the deadbolt and spring-loaded latch with less than a full turn, and can be configured for left or right-hand operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical mortise locks are retrofitted with electronic functionality, then electronic access control capability is improved, but installation complexity and cost increase
Solution Approach 1:
The electronic lock system is divided into separate functional modules: an electronic cylinder assembly that replaces only the key cylinder, a control assembly with circuit board and sensors, a motor assembly for actuation, and a cam mechanism for mechanical linkage. This segmentation allows retrofitting electronic functionality into existing mechanical mortise locks without replacing the entire lock mechanism, reducing installation complexity while maintaining electronic access control capability
Solution Approach 2:
The electronic cylinder assembly is designed to be universally compatible with standard mortise lock configurations. The control assembly can accept multiple input methods (keypad, RFID, Bluetooth) and the cam mechanism works with both single-cam and double-cam lock configurations. This multi-functionality allows the same basic assembly to be installed in various existing door lock systems without requiring custom installation procedures for each scenario
2Reliability
If electronic locks require hard wiring for power and connectivity, then reliable power supply is improved, but ease of installation and retrofit capability deteriorate
Solution Approach 1:
The system replaces hard-wired electrical connections with wireless communication technologies. The control assembly includes Bluetooth and RFID modules that enable wireless communication with mobile devices and access cards. Power is supplied through rechargeable batteries rather than hard-wired electrical connections. This substitution maintains reliable power and data transmission while dramatically simplifying installation and enabling easy retrofit into existing doors without electrical infrastructure
Solution Approach 2:
The electronic lock system includes self-contained power management with rechargeable batteries and wireless charging capability. The system can autonomously manage its own power supply, authentication credentials, and operational status without requiring external wiring infrastructure. This self-service capability enables independent operation and easy installation in any location regardless of existing electrical infrastructure
3Reliability
If electronic locks provide time-based access control, then security control is improved, but user convenience deteriorates when users cannot open the door in time
Solution Approach 1:
The electronic cylinder assembly maintains a continuous engaged state with the cam mechanism once unlocked, allowing the door to remain open without requiring periodic re-authentication. The motor assembly keeps the cam in the unlocked position continuously until the user manually closes and locks the door, eliminating the time-based automatic re-locking limitation and providing continuous access during the authorized period
Data Source
AI summary
A lock and method for locking including an electronic cylinder assembly that may be a direct replacement for a standard cylinder in a standard mortise type door lock housing. The cylinder assembly may include a first shaft rotatably mounted in the core and a second shaft rotatably mounted in the core and coaxial with the first shaft. A clutch is disposed on the first shaft and rotationally fixed to the first shaft but axially shiftable. The cylinder assembly also includes a slider with a finger, where the finger is engaged with the clutch, and a motor is configured to shift the slider axially between a first position and a second position. In the first position, the clutch is disengaged from the second shaft, and in the second position, the clutch is engaged with the second shaft, such that rotation of the first shaft causes rotation of the second shaft.