Patent ID: 8960377
Filing Date: 2015-02-24
Classification: B66B,F16F

Abstract:
1. An elevator system comprising: a car assembly; a drive assembly; and a vibration-damping device arranged at a connection between a top of the car assembly and the drive assembly, including a top plate, a bottom plate, and a plurality of springs configured to provide a total spring stiffness between the top of the car assembly and the drive assembly, wherein the plurality of springs comprises: wherein each spring in the first spring set and each spring in the second spring set are positioned between the top plate and the bottom plate, wherein the top plate and the bottom plate extend across the plurality of springs, wherein at a first car load each spring in the first spring set contacts both the top plate and the bottom plate and each spring in the second spring contacts the bottom plate and is not in contact with the top plate, and at a second car load each spring in the first spring set contacts both the top plate and the bottom plate and each spring in the second spring contacts both the top plate and the bottom plate, the second car load being greater than the first car load; and wherein the total spring stiffness cumulates as a mass of the car assembly increases.