Answer:
A sheave keeps an elevator from moving side to side and further details in discussed below in detail.
Step-by-step explanation:
A sheave is a lifter with a grooved edge surface, at the head of the elevator shaft. ... The cords that uplift the car are also joined to a counterweight, which stretches down on the other front of the sheave [and typically estimates about the mass of the car itself plus 42–50 percent of the complete weight it can sustain.