Patent ID: 6325179
Filing Date: 2001-12-04
Classification: B66B

Abstract:
A diagnostic method for an elevator having a car and a counterweight connected to said car by a rope driven by a sheave having a brake comprising:measuring the distance, S.sub.BU, required to stop the car when traveling upwardly at rated speed, V.sub.0, while the car is empty; andcalculating the force, F.sub.BDF, required to stop the car when traveling downwardly, at rated speed, V.sub.0, while fully loaded with 125% of rated load, Q, asF.sub.BDF =[(V.sub.0.sup.2 /2)(2M+0.5Q)/S.sub.BU ]-0.5Qg,where 2M+0.5Q is the total mass of the empty car and the counterweight, 0.5Q is substantially the amount of mass by which the mass of the counterweight exceeds the mass of the car when empty, and g is the acceleration of gravity.