A mechanical device that couples the car door to the landing door so both open and close simultaneously.
Full Definition
The door coupler (also called vane and roller, or door clutch) is a key safety and operational component that mechanically links the car door to a landing door at each floor stop. When the car arrives at a landing, the coupler engages rollers or vanes on the landing door lock mechanism, allowing the car door operator motor to drive both doors open together. This ensures the landing door—which has no drive motor of its own—always opens in synchrony with the car door. Proper coupler adjustment is critical for smooth, reliable door operation and for maintaining the correct door interlock state.
