What is the minimum stroke for spring buffers for elevators with a speed of 100 FPM or less?

The minimum stroke for spring buffers in elevators with a speed of 100 feet per minute (FPM) or less is 1.5 inches. This requirement is in place to ensure proper absorption of energy during a potential impact or emergency situation.

Spring buffers are crucial components of elevator safety systems, designed to cushion and absorb dynamic forces that may occur during normal operation or potential malfunctions, such as leveling inaccuracies or unintended descents. The specified stroke length ensures that the buffers have sufficient capacity to decelerate and halt the elevator effectively without damaging the equipment or compromising passenger safety.

In settings where speed is limited, like elevators operating at or below 100 FPM, the design can afford to have a more conservative stroke length, such as 1.5 inches. This stroke allows adequate cushioning capacity while aligning with safety codes and manufacturer specifications for lower-speed elevators. Such standards are established to promote reliable safety practices in elevator operation, thereby enhancing safety for all users.