This design has hydraulic jack and rail equipment, utilized to lift the elevator car at a 1:2 ratio. For every foot that the jack rises, the car rises two feet. The jack and rail equipment is mounted either to the rear or to the side of the car, depending upon the opening configuration.
Advantages:
- Requires minimal overhead space
- Dependable long lasting system
- Better ride quality
Disadvantages:
- Requires minimum 8 inch pit
- Oil based system