With the process of urbanization, more and more high-rise buildings, more and more intense public demand for elevator can hold the stretcher. In view of this situation, from August 1, 2012 start of the "Residential Design Code" provides that the total number of layers in the layer above the residential and 12, each building design elevator not less than two, and wherein one to It can accommodate a stretcher. However, this provision to the size and dimensions of the stretcher stretcher elevators are no specific criteria. In the actual case, since the standard was published a short time, the developers in order to save construction costs, but also to a small pool area, some of the elevator shaft or hoistway according to general construction elevators, which does not have an elevator installed substantial stretcher function. In addition, when the old elevator was eliminated update the original hoistway mostly can not meet the general requirements of the stretcher elevator hoistway, and the like. To solve these problems, in this paper, the author introduces a special elevator, which has a ladder stretcher function that can be installed in the passenger elevator shaft into the general.

Passenger elevators in high-rise buildings, the majority of its rated load with 1000kg, 1000kg load paper as an example to introduce the new stretcher lift. For general stretcher elevators, since the shape of the elongated stretcher, so the design of the car also need to grow strip. To 1000kg rated load stretcher elevator, for example, the size of the car is generally 1100mmx2100mm, shaft size is generally 2200mmx2500mm, can accommodate a maximum length of 2000mm stretcher to enter. For the average passenger 1000kg, their empty car is generally 1600mmx1400mm, the size of the hoistway generally 2200mmx2200mm. Whether it is the depth of the car, or the depth of the well, and are not enough to accommodate a stretcher to enter. However, in the diagonal direction of the car, in the air and more than the maximum length of 2100mm, which is provided in this direction may be placed in a stretcher.

In general the elevator car, along the diagonal into the stretcher, stretcher beyond the end of the car wall. That is, the passenger car is actually not accommodate a stretcher. However, in the upper left corner of the hoistway, there are a lot of unused space. If the car space extends in this position, we can provide more space to accommodate a stretcher.