Twin holeless hydraulic elevators

Description

This design utilises two hydraulic jacks and provides maximum structural stability. The jacks, located on each side of the car, are either single-stage or telescopic. The appropriate jack type is determined by the amount of travel and the project conditions. The single-stage jacks are popular for two-stop arrangements, while telescopic jacks are generally used for three- and four-stop projects.

Advantages
No jack hole is required. This eliminates the cost of drilling and the risk of oil contamination;
Accommodates front and rear openings in any configuration;
Available for both low and high capacity cars;

Disadvantages
Usually requires more overhead than an In-Ground project. The greater the travel, the greater the overhead must be.
Requires a wider hoistway for the jacks.
The material cost is typically higher than that of an in ground package.