How should interlocks function in hoistway doors?

Interlocks in hoistway doors are critical safety devices designed to ensure that doors remain securely closed during elevator operation. The correct response highlights that interlocks must secure the door in position. This means that the interlock mechanism prevents the door from being opened while the elevator car is not at that floor or while the elevator is moving. This safety feature helps to protect passengers from accidentally stepping into an elevator shaft, thereby reducing the risk of accidents and injuries.

The requirement for interlocks to securely hold doors in place underscores their role in the overall safety system of an elevator. When an elevator is at a designated floor, the interlock can release the door, allowing it to be opened safely. This mechanism is essential for maintaining the safe operation of elevators and complies with safety regulations.

In contrast, options that suggest the interlocks should remain open at all times or that they should operate manually would compromise the safety of the elevator system. Similarly, stating that they must not interfere with opening does not align with their function, which is to secure doors and only allow access when it is safe to do so. Thus, the focus on securing the door properly reflects the necessary safety standards in elevator operation.