Abstract
We have developed a function that enables adjustment of the distance between two cars of a double-deck elevator to boost the traffic capacity by vertically connecting two cars. The development of this function has led to commercialization of a double-deck elevator that always lands accurately at platforms in a building that has different distances between floors. Two ball screws are installed on both sides of the cars. These ball screws support the upper and lower cars. By reversing the directions of the screws that support the upp* and lower cars, the upper and lower cars move in opposite directions while canceling their own weights through screw rotations. This paper reports the configuration and features of this elevator.
