1.2 Counter balance system shall have a single weight, pulley, cable, counter balance system which prevents sash tilting and permits one finger operation at any point along full width pull.
平衡系统有砝码、滑轮、铰链等装置。平衡系统可以阻止移门倾斜，并且可用一只手操控。收藏指正
尝试查询