Safety locking device for a shaft door of an elevator and method for opening a shaft door of an elevator using a safety locking device

A safety locking device for locking a shaft door of an elevator, the safety locking device comprising:

• a shaft door lock having a first stopper adapted to stop the shaft door at a first position corresponding to a closed configuration of the shaft door, the shaft door lock having a first locked configuration locking the shaft door at the first position;
• an emergency release mechanism adapted to manually release the shaft door lock from the first locked configuration thereby allowing the shaft door to move from the first position in an opening direction to open the shaft door;
• the shaft door lock having a second stopper adapted to stop the shaft door at a second position corresponding to a semi-open configuration of the shaft door, the semi-open configuration being positioned between the closed configuration and an open configuration of the shaft door, the shaft door lock having a second locked configuration locking the shaft door at the second position;
• and
• the shaft door lock having at least one counter-stopper adapted to engage with the first stopper to stop the shaft door at the first position and to engage with the second stopper to stop the shaft door at the second position;
• where the first and second stoppers are both attached to the shaft door or the first and second stoppers are both attached to a stationary door frame at the shaft door.