How many stopping devices are required to prevent a loaded step from passing the top landing on an endless belt type manlift?

In the context of endless belt type manlifts, safety is paramount, especially in preventing loaded steps from moving past the top landing. The requirement for stopping devices is designed to ensure that, in the event of a failure or malfunction, the loaded step does not inadvertently exceed the designated stopping point.

Having three stopping devices is essential because it provides redundancy and enhances safety. The use of multiple stopping devices ensures that if one device should fail, the other two can still operate to stop the loaded step. This redundancy is particularly important in scenarios where there might be a risk of injury to passengers or damage to the machinery.

Regulatory standards often dictate the necessary number of stopping devices based on engineering principles that prioritize safety and reliability in elevating devices. By requiring three stopping devices, the design ensures that the manlift operates within safe parameters, thereby minimizing the risk of accidents at the top landing. This requirement reflects an understanding of the dynamic forces and potential hazards involved in the operation of manlifts.