What is the minimum stroke for spring buffers for elevators running at speeds of 151 to 200 FPM?

The minimum stroke for spring buffers for elevators operating at speeds of 151 to 200 feet per minute is specifically stipulated by industry standards and regulations to ensure sufficient deceleration and safety during operation. At these higher speeds, there is a greater potential for impact forces, and the buffers need to be effective in absorbing the energy generated during a downward landing or in case of an emergency stop.

A stroke of 4 inches for spring buffers provides the necessary cushioning and absorption required to adequately protect the elevator car, its occupants, and the machinery from damage in the event of a malfunction or other issues. This stroke length is designed to allow sufficient compression of the buffer spring to effectively mitigate impact forces, ensuring safe operation.

In practice, carefully following these guidelines is crucial for maintaining safety standards within elevator systems, particularly as speeds increase and the forces at play become more significant. This regulation is based on extensive safety testing and engineering principles, making it a critical aspect of elevator design and maintenance.