Freewheeling & Emergency Override Cams: Double-Sided Key Operation Kinematics
Engineering Overview: Technical breakdown of freewheeling clutch mechanisms and dual-sided emergency override functions in architectural Euro profile cylinders.
Technical & Engineering Specifications
| Material | Hardened Sintered Steel Clutch Disc |
|---|---|
| Operation | Operable from outside even with key left inside |
| Application | Care Homes, Hospitals, Multi-Family Residential |
| Cam Mechanism | Dual-Sided Emergency Override Clutch (BS Function) |
Emergency Override (Clutch) Function
In standard double cylinders, leaving a key inserted on the inside locks the clutch, preventing an external key from entering. Emergency Function (BS / Dual-Clutch) Cylinders incorporate a floating spring-loaded clutch sleeve.
Dual-Sided Engagement Mechanics
- Spring-Loaded Central Clutch: An internal sliding disc couples whichever side has a key inserted with torque.
- Simultaneous Override: If a key is left on the inside, inserting an external key pushes the clutch spring back, allowing exterior unlocking during medical emergencies.
Frequently Asked Engineering & Selection Questions
Q1: How does an emergency function lock cylinder work?
An internal spring-loaded clutch allows the exterior key to override and rotate the central cam even if an inside key is left fully turned in the lock.