HOLELESS – Single & Two Stage Jacks

TWIN JACK HOLELESS CAR
TYPE SUMMARY

This design uses (2) jacks, one on each side of the car, positioned between the platform and the hoistway wall. Single stage jacks are used for low travel, typically on 2 stop cars up to 14 ft. Two stage jacks are used for travel up to 28 to 30 feet (typically 3 to 4 stops).

Advantages

The jacks are located above ground, thereby eliminating the need to drill a jack hole and eliminating the risk of oil contamination. This car type will also accommodate low and high capacity cars.

Disadvantages

Travel is typically restricted to a 2 to 4 stop application. Depending upon the travel, an extended overhead may be required to fit the jacks into the hoistway elevation. The hoistway width requirement may also be a little greater than an in-ground car type, for high capacity applications.